Merge branch 'dev' into menu-consistency

app/src/main/java/org/schabi/newpipe/CheckForNewAppVersionTask.java

@@ -14,6 +14,7 @@ import android.os.AsyncTask;
 import android.preference.PreferenceManager;
 import android.support.v4.app.NotificationCompat;
 import android.support.v4.app.NotificationManagerCompat;
+import android.util.Log;
 
 import org.json.JSONException;
 import org.json.JSONObject;
@@ -47,6 +48,8 @@ import okhttp3.Response;
  */
 public class CheckForNewAppVersionTask extends AsyncTask<Void, Void, String> {
 
+    private static final boolean DEBUG = MainActivity.DEBUG;
+    private static final String TAG = CheckForNewAppVersionTask.class.getSimpleName();
     private static final Application app = App.getApp();
     private static final String GITHUB_APK_SHA1 = "B0:2E:90:7C:1C:D6:FC:57:C3:35:F0:88:D0:8F:50:5F:94:E4:D2:15";
     private static final String newPipeApiUrl = "https://newpipe.schabi.org/api/data.json";
@@ -90,9 +93,8 @@ public class CheckForNewAppVersionTask extends AsyncTask<Void, Void, String> {
             Response response = client.newCall(request).execute();
             return response.body().string();
         } catch (IOException ex) {
-            ErrorActivity.reportError(app, ex, null, null,
+            // connectivity problems, do not alarm user and fail silently
-                    ErrorActivity.ErrorInfo.make(UserAction.SOMETHING_ELSE, "none",
+            if (DEBUG) Log.w(TAG, Log.getStackTraceString(ex));
-                            "app update API fail", R.string.app_ui_crash));
         }
 
         return null;
@@ -117,9 +119,8 @@ public class CheckForNewAppVersionTask extends AsyncTask<Void, Void, String> {
                 compareAppVersionAndShowNotification(versionName, apkLocationUrl, versionCode);
 
             } catch (JSONException ex) {
-                ErrorActivity.reportError(app, ex, null, null,
+                // connectivity problems, do not alarm user and fail silently
-                        ErrorActivity.ErrorInfo.make(UserAction.SOMETHING_ELSE, "none",
+                if (DEBUG) Log.w(TAG, Log.getStackTraceString(ex));
-                        "could not parse app update JSON data", R.string.app_ui_crash));
             }
         }
     }

app/src/main/java/org/schabi/newpipe/RouterActivity.java

@@ -574,7 +574,7 @@ public class RouterActivity extends AppCompatActivity {
                         playQueue = new SinglePlayQueue((StreamInfo) info);
 
                         if (playerChoice.equals(videoPlayerKey)) {
-                            NavigationHelper.playOnMainPlayer(this, playQueue);
+                            NavigationHelper.playOnMainPlayer(this, playQueue, true);
                         } else if (playerChoice.equals(backgroundPlayerKey)) {
                             NavigationHelper.enqueueOnBackgroundPlayer(this, playQueue, true);
                         } else if (playerChoice.equals(popupPlayerKey)) {
@@ -587,11 +587,11 @@ public class RouterActivity extends AppCompatActivity {
                     playQueue = info instanceof ChannelInfo ? new ChannelPlayQueue((ChannelInfo) info) : new PlaylistPlayQueue((PlaylistInfo) info);
 
                     if (playerChoice.equals(videoPlayerKey)) {
-                        NavigationHelper.playOnMainPlayer(this, playQueue);
+                        NavigationHelper.playOnMainPlayer(this, playQueue, true);
                     } else if (playerChoice.equals(backgroundPlayerKey)) {
-                        NavigationHelper.playOnBackgroundPlayer(this, playQueue);
+                        NavigationHelper.playOnBackgroundPlayer(this, playQueue, true);
                     } else if (playerChoice.equals(popupPlayerKey)) {
-                        NavigationHelper.playOnPopupPlayer(this, playQueue);
+                        NavigationHelper.playOnPopupPlayer(this, playQueue, true);
                     }
                 }
             };

app/src/main/java/org/schabi/newpipe/database/history/dao/StreamHistoryDAO.java

@@ -50,6 +50,11 @@ public abstract class StreamHistoryDAO implements HistoryDAO<StreamHistoryEntity
             " ORDER BY " + STREAM_ACCESS_DATE + " DESC")
     public abstract Flowable<List<StreamHistoryEntry>> getHistory();
 
+    @Query("SELECT * FROM " + STREAM_HISTORY_TABLE + " WHERE " + JOIN_STREAM_ID +
+            " = :streamId ORDER BY " + STREAM_ACCESS_DATE + " DESC LIMIT 1")
+    @Nullable
+    public abstract StreamHistoryEntity getLatestEntry(final long streamId);
+
     @Query("DELETE FROM " + STREAM_HISTORY_TABLE + " WHERE " + JOIN_STREAM_ID + " = :streamId")
     public abstract int deleteStreamHistory(final long streamId);
 

app/src/main/java/org/schabi/newpipe/database/stream/model/StreamStateEntity.java

@@ -4,6 +4,9 @@ package org.schabi.newpipe.database.stream.model;
 import android.arch.persistence.room.ColumnInfo;
 import android.arch.persistence.room.Entity;
 import android.arch.persistence.room.ForeignKey;
+import android.support.annotation.Nullable;
+
+import java.util.concurrent.TimeUnit;
 
 import static android.arch.persistence.room.ForeignKey.CASCADE;
 import static org.schabi.newpipe.database.stream.model.StreamStateEntity.JOIN_STREAM_ID;
@@ -22,6 +25,12 @@ public class StreamStateEntity {
     final public static String JOIN_STREAM_ID       = "stream_id";
     final public static String STREAM_PROGRESS_TIME = "progress_time";
 
+
+    /** Playback state will not be saved, if playback time less than this threshold */
+    private static final int PLAYBACK_SAVE_THRESHOLD_START_SECONDS = 5;
+    /** Playback state will not be saved, if time left less than this threshold */
+    private static final int PLAYBACK_SAVE_THRESHOLD_END_SECONDS = 10;
+
     @ColumnInfo(name = JOIN_STREAM_ID)
     private long streamUid;
 
@@ -48,4 +57,18 @@ public class StreamStateEntity {
     public void setProgressTime(long progressTime) {
         this.progressTime = progressTime;
     }
+
+    public boolean isValid(int durationInSeconds) {
+        final int seconds = (int) TimeUnit.MILLISECONDS.toSeconds(progressTime);
+        return seconds > PLAYBACK_SAVE_THRESHOLD_START_SECONDS
+                && seconds < durationInSeconds - PLAYBACK_SAVE_THRESHOLD_END_SECONDS;
+    }
+
+    @Override
+    public boolean equals(@Nullable Object obj) {
+        if (obj instanceof StreamStateEntity) {
+            return ((StreamStateEntity) obj).streamUid == streamUid
+                    && ((StreamStateEntity) obj).progressTime == progressTime;
+        } else return false;
+    }
 }

app/src/main/java/org/schabi/newpipe/download/DownloadActivity.java

@@ -55,7 +55,7 @@ public class DownloadActivity extends AppCompatActivity {
     private void updateFragments() {
         MissionsFragment fragment = new MissionsFragment();
 
-        getFragmentManager().beginTransaction()
+        getSupportFragmentManager().beginTransaction()
                 .replace(R.id.frame, fragment, MISSIONS_FRAGMENT_TAG)
                 .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE)
                 .commit();

app/src/main/java/org/schabi/newpipe/download/DownloadDialog.java

@@ -1,14 +1,23 @@
 package org.schabi.newpipe.download;
 
+import android.app.Activity;
+import android.content.ComponentName;
 import android.content.Context;
+import android.content.Intent;
+import android.content.ServiceConnection;
 import android.content.SharedPreferences;
+import android.net.Uri;
 import android.os.Bundle;
+import android.os.IBinder;
 import android.preference.PreferenceManager;
 import android.support.annotation.IdRes;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
+import android.support.annotation.StringRes;
 import android.support.v4.app.DialogFragment;
+import android.support.v4.provider.DocumentFile;
 import android.support.v7.app.AlertDialog;
+import android.support.v7.view.menu.ActionMenuItemView;
 import android.support.v7.widget.Toolbar;
 import android.util.Log;
 import android.util.SparseArray;
@@ -34,7 +43,8 @@ import org.schabi.newpipe.extractor.stream.StreamInfo;
 import org.schabi.newpipe.extractor.stream.SubtitlesStream;
 import org.schabi.newpipe.extractor.stream.VideoStream;
 import org.schabi.newpipe.extractor.utils.Localization;
-import org.schabi.newpipe.settings.NewPipeSettings;
+import org.schabi.newpipe.report.ErrorActivity;
+import org.schabi.newpipe.report.UserAction;
 import org.schabi.newpipe.util.FilenameUtils;
 import org.schabi.newpipe.util.ListHelper;
 import org.schabi.newpipe.util.PermissionHelper;
@@ -43,19 +53,27 @@ import org.schabi.newpipe.util.StreamItemAdapter;
 import org.schabi.newpipe.util.StreamItemAdapter.StreamSizeWrapper;
 import org.schabi.newpipe.util.ThemeHelper;
 
+import java.io.IOException;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 import java.util.Locale;
 
 import icepick.Icepick;
 import icepick.State;
 import io.reactivex.disposables.CompositeDisposable;
+import us.shandian.giga.io.StoredDirectoryHelper;
+import us.shandian.giga.io.StoredFileHelper;
 import us.shandian.giga.postprocessing.Postprocessing;
+import us.shandian.giga.service.DownloadManager;
 import us.shandian.giga.service.DownloadManagerService;
+import us.shandian.giga.service.DownloadManagerService.DownloadManagerBinder;
+import us.shandian.giga.service.MissionState;
 
 public class DownloadDialog extends DialogFragment implements RadioGroup.OnCheckedChangeListener, AdapterView.OnItemSelectedListener {
     private static final String TAG = "DialogFragment";
     private static final boolean DEBUG = MainActivity.DEBUG;
+    private static final int REQUEST_DOWNLOAD_PATH_SAF = 0x1230;
 
     @State
     protected StreamInfo currentInfo;
@@ -80,7 +98,7 @@ public class DownloadDialog extends DialogFragment implements RadioGroup.OnCheck
 
     private EditText nameEditText;
     private Spinner streamsSpinner;
-    private RadioGroup radioVideoAudioGroup;
+    private RadioGroup radioStreamsGroup;
     private TextView threadsCountTextView;
     private SeekBar threadsSeekBar;
 
@@ -160,7 +178,9 @@ public class DownloadDialog extends DialogFragment implements RadioGroup.OnCheck
             return;
         }
 
-        setStyle(STYLE_NO_TITLE, ThemeHelper.getDialogTheme(getContext()));
+        context = getContext();
+
+        setStyle(STYLE_NO_TITLE, ThemeHelper.getDialogTheme(context));
         Icepick.restoreInstanceState(this, savedInstanceState);
 
         SparseArray<SecondaryStreamHelper<AudioStream>> secondaryStreams = new SparseArray<>(4);
@@ -177,9 +197,59 @@ public class DownloadDialog extends DialogFragment implements RadioGroup.OnCheck
             }
         }
 
-        this.videoStreamsAdapter = new StreamItemAdapter<>(getContext(), wrappedVideoStreams, secondaryStreams);
+        this.videoStreamsAdapter = new StreamItemAdapter<>(context, wrappedVideoStreams, secondaryStreams);
-        this.audioStreamsAdapter = new StreamItemAdapter<>(getContext(), wrappedAudioStreams);
+        this.audioStreamsAdapter = new StreamItemAdapter<>(context, wrappedAudioStreams);
-        this.subtitleStreamsAdapter = new StreamItemAdapter<>(getContext(), wrappedSubtitleStreams);
+        this.subtitleStreamsAdapter = new StreamItemAdapter<>(context, wrappedSubtitleStreams);
+
+        Intent intent = new Intent(context, DownloadManagerService.class);
+        context.startService(intent);
+
+        context.bindService(intent, new ServiceConnection() {
+            @Override
+            public void onServiceConnected(ComponentName cname, IBinder service) {
+                DownloadManagerBinder mgr = (DownloadManagerBinder) service;
+
+                mainStorageAudio = mgr.getMainStorageAudio();
+                mainStorageVideo = mgr.getMainStorageVideo();
+                downloadManager = mgr.getDownloadManager();
+                askForSavePath = mgr.askForSavePath();
+
+                okButton.setEnabled(true);
+
+                context.unbindService(this);
+
+                // check of download paths are defined
+                if (!askForSavePath) {
+                    String msg = "";
+                    if (mainStorageVideo == null) msg += getString(R.string.download_path_title);
+                    if (mainStorageAudio == null)
+                        msg += getString(R.string.download_path_audio_title);
+
+                    if (!msg.isEmpty()) {
+                        String title;
+                        if (mainStorageVideo == null && mainStorageAudio == null) {
+                            title = getString(R.string.general_error);
+                            msg = getString(R.string.no_available_dir) + ":\n" + msg;
+                        } else {
+                            title = msg;
+                            msg = getString(R.string.no_available_dir);
+                        }
+
+                        new AlertDialog.Builder(context)
+                                .setPositiveButton(android.R.string.ok, null)
+                                .setTitle(title)
+                                .setMessage(msg)
+                                .create()
+                                .show();
+                    }
+                }
+            }
+
+            @Override
+            public void onServiceDisconnected(ComponentName name) {
+                // nothing to do
+            }
+        }, Context.BIND_AUTO_CREATE);
     }
 
     @Override
@@ -204,8 +274,8 @@ public class DownloadDialog extends DialogFragment implements RadioGroup.OnCheck
         threadsCountTextView = view.findViewById(R.id.threads_count);
         threadsSeekBar = view.findViewById(R.id.threads);
 
-        radioVideoAudioGroup = view.findViewById(R.id.video_audio_group);
+        radioStreamsGroup = view.findViewById(R.id.video_audio_group);
-        radioVideoAudioGroup.setOnCheckedChangeListener(this);
+        radioStreamsGroup.setOnCheckedChangeListener(this);
 
         initToolbar(view.findViewById(R.id.toolbar));
         setupDownloadOptions();
@@ -240,17 +310,17 @@ public class DownloadDialog extends DialogFragment implements RadioGroup.OnCheck
         disposables.clear();
 
         disposables.add(StreamSizeWrapper.fetchSizeForWrapper(wrappedVideoStreams).subscribe(result -> {
-            if (radioVideoAudioGroup.getCheckedRadioButtonId() == R.id.video_button) {
+            if (radioStreamsGroup.getCheckedRadioButtonId() == R.id.video_button) {
                 setupVideoSpinner();
             }
         }));
         disposables.add(StreamSizeWrapper.fetchSizeForWrapper(wrappedAudioStreams).subscribe(result -> {
-            if (radioVideoAudioGroup.getCheckedRadioButtonId() == R.id.audio_button) {
+            if (radioStreamsGroup.getCheckedRadioButtonId() == R.id.audio_button) {
                 setupAudioSpinner();
             }
         }));
         disposables.add(StreamSizeWrapper.fetchSizeForWrapper(wrappedSubtitleStreams).subscribe(result -> {
-            if (radioVideoAudioGroup.getCheckedRadioButtonId() == R.id.subtitle_button) {
+            if (radioStreamsGroup.getCheckedRadioButtonId() == R.id.subtitle_button) {
                 setupSubtitleSpinner();
             }
         }));
@@ -263,22 +333,49 @@ public class DownloadDialog extends DialogFragment implements RadioGroup.OnCheck
     }
 
     @Override
-    public void onSaveInstanceState(Bundle outState) {
+    public void onSaveInstanceState(@NonNull Bundle outState) {
         super.onSaveInstanceState(outState);
         Icepick.saveInstanceState(this, outState);
     }
 
+    @Override
+    public void onActivityResult(int requestCode, int resultCode, Intent data) {
+        super.onActivityResult(requestCode, resultCode, data);
+
+        if (requestCode == REQUEST_DOWNLOAD_PATH_SAF && resultCode == Activity.RESULT_OK) {
+            if (data.getData() == null) {
+                showFailedDialog(R.string.general_error);
+                return;
+            }
+
+            DocumentFile docFile = DocumentFile.fromSingleUri(context, data.getData());
+            if (docFile == null) {
+                showFailedDialog(R.string.general_error);
+                return;
+            }
+
+            // check if the selected file was previously used
+            checkSelectedDownload(null, data.getData(), docFile.getName(), docFile.getType());
+        }
+    }
+
     /*//////////////////////////////////////////////////////////////////////////
     // Inits
     //////////////////////////////////////////////////////////////////////////*/
 
     private void initToolbar(Toolbar toolbar) {
         if (DEBUG) Log.d(TAG, "initToolbar() called with: toolbar = [" + toolbar + "]");
+
+        boolean isLight = ThemeHelper.isLightThemeSelected(getActivity());
+
         toolbar.setTitle(R.string.download_dialog_title);
-        toolbar.setNavigationIcon(ThemeHelper.isLightThemeSelected(getActivity()) ? R.drawable.ic_arrow_back_black_24dp : R.drawable.ic_arrow_back_white_24dp);
+        toolbar.setNavigationIcon(isLight ? R.drawable.ic_arrow_back_black_24dp : R.drawable.ic_arrow_back_white_24dp);
         toolbar.inflateMenu(R.menu.dialog_url);
         toolbar.setNavigationOnClickListener(v -> getDialog().dismiss());
 
+        okButton = toolbar.findViewById(R.id.okay);
+        okButton.setEnabled(false);// disable until the download service connection is done
+
         toolbar.setOnMenuItemClickListener(item -> {
             if (item.getItemId() == R.id.okay) {
                 prepareSelectedDownload();
@@ -346,7 +443,7 @@ public class DownloadDialog extends DialogFragment implements RadioGroup.OnCheck
     public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
         if (DEBUG)
             Log.d(TAG, "onItemSelected() called with: parent = [" + parent + "], view = [" + view + "], position = [" + position + "], id = [" + id + "]");
-        switch (radioVideoAudioGroup.getCheckedRadioButtonId()) {
+        switch (radioStreamsGroup.getCheckedRadioButtonId()) {
             case R.id.audio_button:
                 selectedAudioIndex = position;
                 break;
@@ -370,9 +467,9 @@ public class DownloadDialog extends DialogFragment implements RadioGroup.OnCheck
     protected void setupDownloadOptions() {
         setRadioButtonsState(false);
 
-        final RadioButton audioButton = radioVideoAudioGroup.findViewById(R.id.audio_button);
+        final RadioButton audioButton = radioStreamsGroup.findViewById(R.id.audio_button);
-        final RadioButton videoButton = radioVideoAudioGroup.findViewById(R.id.video_button);
+        final RadioButton videoButton = radioStreamsGroup.findViewById(R.id.video_button);
-        final RadioButton subtitleButton = radioVideoAudioGroup.findViewById(R.id.subtitle_button);
+        final RadioButton subtitleButton = radioStreamsGroup.findViewById(R.id.subtitle_button);
         final boolean isVideoStreamsAvailable = videoStreamsAdapter.getCount() > 0;
         final boolean isAudioStreamsAvailable = audioStreamsAdapter.getCount() > 0;
         final boolean isSubtitleStreamsAvailable = subtitleStreamsAdapter.getCount() > 0;
@@ -397,9 +494,9 @@ public class DownloadDialog extends DialogFragment implements RadioGroup.OnCheck
     }
 
     private void setRadioButtonsState(boolean enabled) {
-        radioVideoAudioGroup.findViewById(R.id.audio_button).setEnabled(enabled);
+        radioStreamsGroup.findViewById(R.id.audio_button).setEnabled(enabled);
-        radioVideoAudioGroup.findViewById(R.id.video_button).setEnabled(enabled);
+        radioStreamsGroup.findViewById(R.id.video_button).setEnabled(enabled);
-        radioVideoAudioGroup.findViewById(R.id.subtitle_button).setEnabled(enabled);
+        radioStreamsGroup.findViewById(R.id.subtitle_button).setEnabled(enabled);
     }
 
     private int getSubtitleIndexBy(List<SubtitlesStream> streams) {
@@ -434,98 +531,297 @@ public class DownloadDialog extends DialogFragment implements RadioGroup.OnCheck
         return 0;
     }
 
+    StoredDirectoryHelper mainStorageAudio = null;
+    StoredDirectoryHelper mainStorageVideo = null;
+    DownloadManager downloadManager = null;
+    ActionMenuItemView okButton = null;
+    Context context;
+    boolean askForSavePath;
+
+    private String getNameEditText() {
+        String str = nameEditText.getText().toString().trim();
+
+        return FilenameUtils.createFilename(context, str.isEmpty() ? currentInfo.getName() : str);
+    }
+
+    private void showFailedDialog(@StringRes int msg) {
+        new AlertDialog.Builder(context)
+                .setTitle(R.string.general_error)
+                .setMessage(msg)
+                .setNegativeButton(android.R.string.ok, null)
+                .create()
+                .show();
+    }
+
+    private void showErrorActivity(Exception e) {
+        ErrorActivity.reportError(
+                context,
+                Collections.singletonList(e),
+                null,
+                null,
+                ErrorActivity.ErrorInfo.make(UserAction.SOMETHING_ELSE, "-", "-", R.string.general_error)
+        );
+    }
+
     private void prepareSelectedDownload() {
-        final Context context = getContext();
+        StoredDirectoryHelper mainStorage;
-        Stream stream;
+        MediaFormat format;
-        String location;
+        String mime;
-        char kind;
 
-        String fileName = nameEditText.getText().toString().trim();
+        // first, build the filename and get the output folder (if possible)
-        if (fileName.isEmpty())
+        // later, run a very very very large file checking logic
-            fileName = FilenameUtils.createFilename(context, currentInfo.getName());
 
-        switch (radioVideoAudioGroup.getCheckedRadioButtonId()) {
+        String filename = getNameEditText().concat(".");
+
+        switch (radioStreamsGroup.getCheckedRadioButtonId()) {
             case R.id.audio_button:
-                stream = audioStreamsAdapter.getItem(selectedAudioIndex);
+                mainStorage = mainStorageAudio;
-                location = NewPipeSettings.getAudioDownloadPath(context);
+                format = audioStreamsAdapter.getItem(selectedAudioIndex).getFormat();
-                kind = 'a';
+                mime = format.mimeType;
+                filename += format.suffix;
                 break;
             case R.id.video_button:
-                stream = videoStreamsAdapter.getItem(selectedVideoIndex);
+                mainStorage = mainStorageVideo;
-                location = NewPipeSettings.getVideoDownloadPath(context);
+                format = videoStreamsAdapter.getItem(selectedVideoIndex).getFormat();
-                kind = 'v';
+                mime = format.mimeType;
+                filename += format.suffix;
                 break;
             case R.id.subtitle_button:
-                stream = subtitleStreamsAdapter.getItem(selectedSubtitleIndex);
+                mainStorage = mainStorageVideo;// subtitle & video files go together
-                location = NewPipeSettings.getVideoDownloadPath(context);// assume that subtitle & video files go together
+                format = subtitleStreamsAdapter.getItem(selectedSubtitleIndex).getFormat();
-                kind = 's';
+                mime = format.mimeType;
+                filename += format == MediaFormat.TTML ? MediaFormat.SRT.suffix : format.suffix;
+                break;
+            default:
+                throw new RuntimeException("No stream selected");
+        }
+
+        if (mainStorage == null || askForSavePath) {
+            // This part is called if with SAF preferred:
+            //  * older android version running
+            //  * save path not defined (via download settings)
+            //  * the user as checked the "ask where to download" option
+
+            StoredFileHelper.requestSafWithFileCreation(this, REQUEST_DOWNLOAD_PATH_SAF, filename, mime);
+            return;
+        }
+
+        // check for existing file with the same name
+        checkSelectedDownload(mainStorage, mainStorage.findFile(filename), filename, mime);
+    }
+
+    private void checkSelectedDownload(StoredDirectoryHelper mainStorage, Uri targetFile, String filename, String mime) {
+        StoredFileHelper storage;
+
+        try {
+            if (mainStorage == null) {
+                // using SAF on older android version
+                storage = new StoredFileHelper(context, null, targetFile, "");
+            } else if (targetFile == null) {
+                // the file does not exist, but it is probably used in a pending download
+                storage = new StoredFileHelper(mainStorage.getUri(), filename, mime, mainStorage.getTag());
+            } else {
+                // the target filename is already use, attempt to use it
+                storage = new StoredFileHelper(context, mainStorage.getUri(), targetFile, mainStorage.getTag());
+            }
+        } catch (Exception e) {
+            showErrorActivity(e);
+            return;
+        }
+
+        // check if is our file
+        MissionState state = downloadManager.checkForExistingMission(storage);
+        @StringRes int msgBtn;
+        @StringRes int msgBody;
+
+        switch (state) {
+            case Finished:
+                msgBtn = R.string.overwrite;
+                msgBody = R.string.overwrite_finished_warning;
+                break;
+            case Pending:
+                msgBtn = R.string.overwrite;
+                msgBody = R.string.download_already_pending;
+                break;
+            case PendingRunning:
+                msgBtn = R.string.generate_unique_name;
+                msgBody = R.string.download_already_running;
+                break;
+            case None:
+                if (mainStorage == null) {
+                    // This part is called if:
+                    // * using SAF on older android version
+                    // * save path not defined
+                    continueSelectedDownload(storage);
+                    return;
+                } else if (targetFile == null) {
+                    // This part is called if:
+                    // * the filename is not used in a pending/finished download
+                    // * the file does not exists, create
+
+                    if (!mainStorage.mkdirs()) {
+                        showFailedDialog(R.string.error_path_creation);
+                        return;
+                    }
+
+                    storage = mainStorage.createFile(filename, mime);
+                    if (storage == null || !storage.canWrite()) {
+                        showFailedDialog(R.string.error_file_creation);
+                        return;
+                    }
+
+                    continueSelectedDownload(storage);
+                    return;
+                }
+                msgBtn = R.string.overwrite;
+                msgBody = R.string.overwrite_unrelated_warning;
                 break;
             default:
                 return;
         }
 
-        int threads;
 
-        if (radioVideoAudioGroup.getCheckedRadioButtonId() == R.id.subtitle_button) {
+        AlertDialog.Builder askDialog = new AlertDialog.Builder(context)
-            threads = 1;// use unique thread for subtitles due small file size
+                .setTitle(R.string.download_dialog_title)
-            fileName += ".srt";// final subtitle format
+                .setMessage(msgBody)
-        } else {
+                .setNegativeButton(android.R.string.cancel, null);
-            threads = threadsSeekBar.getProgress() + 1;
+        final StoredFileHelper finalStorage = storage;
-            fileName += "." + stream.getFormat().getSuffix();
+
+
+        if (mainStorage == null) {
+            // This part is called if:
+            // * using SAF on older android version
+            // * save path not defined
+            switch (state) {
+                case Pending:
+                case Finished:
+                    askDialog.setPositiveButton(msgBtn, (dialog, which) -> {
+                        dialog.dismiss();
+                        downloadManager.forgetMission(finalStorage);
+                        continueSelectedDownload(finalStorage);
+                    });
+                    break;
+            }
+
+            askDialog.create().show();
+            return;
         }
 
-        final String finalFileName = fileName;
+        askDialog.setPositiveButton(msgBtn, (dialog, which) -> {
+            dialog.dismiss();
 
-        DownloadManagerService.checkForRunningMission(context, location, fileName, (listed, finished) -> {
+            StoredFileHelper storageNew;
-            if (listed) {
+            switch (state) {
-                AlertDialog.Builder builder = new AlertDialog.Builder(context);
+                case Finished:
-                builder.setTitle(R.string.download_dialog_title)
+                case Pending:
-                        .setMessage(finished ? R.string.overwrite_warning : R.string.download_already_running)
+                    downloadManager.forgetMission(finalStorage);
-                        .setPositiveButton(
+                case None:
-                                finished ? R.string.overwrite : R.string.generate_unique_name,
+                    if (targetFile == null) {
-                                (dialog, which) -> downloadSelected(context, stream, location, finalFileName, kind, threads)
+                        storageNew = mainStorage.createFile(filename, mime);
-                        )
+                    } else {
-                        .setNegativeButton(android.R.string.cancel, (dialog, which) -> {
+                        try {
-                            dialog.cancel();
+                            // try take (or steal) the file
-                        })
+                            storageNew = new StoredFileHelper(context, mainStorage.getUri(), targetFile, mainStorage.getTag());
-                        .create()
+                        } catch (IOException e) {
-                        .show();
+                            Log.e(TAG, "Failed to take (or steal) the file in " + targetFile.toString());
-            } else {
+                            storageNew = null;
-                downloadSelected(context, stream, location, finalFileName, kind, threads);
+                        }
+                    }
+
+                    if (storageNew != null && storageNew.canWrite())
+                        continueSelectedDownload(storageNew);
+                    else
+                        showFailedDialog(R.string.error_file_creation);
+                    break;
+                case PendingRunning:
+                    storageNew = mainStorage.createUniqueFile(filename, mime);
+                    if (storageNew == null)
+                        showFailedDialog(R.string.error_file_creation);
+                    else
+                        continueSelectedDownload(storageNew);
+                    break;
             }
         });
+
+        askDialog.create().show();
     }
 
-    private void downloadSelected(Context context, Stream selectedStream, String location, String fileName, char kind, int threads) {
+    private void continueSelectedDownload(@NonNull StoredFileHelper storage) {
+        if (!storage.canWrite()) {
+            showFailedDialog(R.string.permission_denied);
+            return;
+        }
+
+        // check if the selected file has to be overwritten, by simply checking its length
+        try {
+            if (storage.length() > 0) storage.truncate();
+        } catch (IOException e) {
+            Log.e(TAG, "failed to overwrite the file: " + storage.getUri().toString(), e);
+            showFailedDialog(R.string.overwrite_failed);
+            return;
+        }
+
+        Stream selectedStream;
+        char kind;
+        int threads = threadsSeekBar.getProgress() + 1;
         String[] urls;
         String psName = null;
         String[] psArgs = null;
         String secondaryStreamUrl = null;
         long nearLength = 0;
 
-        if (selectedStream instanceof VideoStream) {
+        // more download logic: select muxer, subtitle converter, etc.
-            SecondaryStreamHelper<AudioStream> secondaryStream = videoStreamsAdapter
+        switch (radioStreamsGroup.getCheckedRadioButtonId()) {
-                    .getAllSecondary()
+            case R.id.audio_button:
-                    .get(wrappedVideoStreams.getStreamsList().indexOf(selectedStream));
+                threads = 1;// use unique thread for subtitles due small file size
+                kind = 'a';
+                selectedStream = audioStreamsAdapter.getItem(selectedAudioIndex);
 
-            if (secondaryStream != null) {
+                if (selectedStream.getFormat() == MediaFormat.M4A) {
-                secondaryStreamUrl = secondaryStream.getStream().getUrl();
+                    psName = Postprocessing.ALGORITHM_M4A_NO_DASH;
-                psName = selectedStream.getFormat() == MediaFormat.MPEG_4 ? Postprocessing.ALGORITHM_MP4_MUXER : Postprocessing.ALGORITHM_WEBM_MUXER;
-                psArgs = null;
-                long videoSize = wrappedVideoStreams.getSizeInBytes((VideoStream) selectedStream);
-
-                // set nearLength, only, if both sizes are fetched or known. this probably does not work on slow networks
-                if (secondaryStream.getSizeInBytes() > 0 && videoSize > 0) {
-                    nearLength = secondaryStream.getSizeInBytes() + videoSize;
                 }
-            }
+                break;
-        } else if ((selectedStream instanceof SubtitlesStream) && selectedStream.getFormat() == MediaFormat.TTML) {
+            case R.id.video_button:
-            psName = Postprocessing.ALGORITHM_TTML_CONVERTER;
+                kind = 'v';
-            psArgs = new String[]{
+                selectedStream = videoStreamsAdapter.getItem(selectedVideoIndex);
-                    selectedStream.getFormat().getSuffix(),
+
-                    "false",// ignore empty frames
+                SecondaryStreamHelper<AudioStream> secondaryStream = videoStreamsAdapter
-                    "false",// detect youtube duplicate lines
+                        .getAllSecondary()
-            };
+                        .get(wrappedVideoStreams.getStreamsList().indexOf(selectedStream));
+
+                if (secondaryStream != null) {
+                    secondaryStreamUrl = secondaryStream.getStream().getUrl();
+
+                    if (selectedStream.getFormat() == MediaFormat.MPEG_4)
+                        psName = Postprocessing.ALGORITHM_MP4_FROM_DASH_MUXER;
+                    else
+                        psName = Postprocessing.ALGORITHM_WEBM_MUXER;
+
+                    psArgs = null;
+                    long videoSize = wrappedVideoStreams.getSizeInBytes((VideoStream) selectedStream);
+
+                    // set nearLength, only, if both sizes are fetched or known. This probably
+                    // does not work on slow networks but is later updated in the downloader
+                    if (secondaryStream.getSizeInBytes() > 0 && videoSize > 0) {
+                        nearLength = secondaryStream.getSizeInBytes() + videoSize;
+                    }
+                }
+                break;
+            case R.id.subtitle_button:
+                kind = 's';
+                selectedStream = subtitleStreamsAdapter.getItem(selectedSubtitleIndex);
+
+                if (selectedStream.getFormat() == MediaFormat.TTML) {
+                    psName = Postprocessing.ALGORITHM_TTML_CONVERTER;
+                    psArgs = new String[]{
+                            selectedStream.getFormat().getSuffix(),
+                            "false",// ignore empty frames
+                            "false",// detect youtube duplicate lines
+                    };
+                }
+                break;
+            default:
+                return;
         }
 
         if (secondaryStreamUrl == null) {
@@ -534,8 +830,8 @@ public class DownloadDialog extends DialogFragment implements RadioGroup.OnCheck
             urls = new String[]{selectedStream.getUrl(), secondaryStreamUrl};
         }
 
-        DownloadManagerService.startMission(context, urls, location, fileName, kind, threads, currentInfo.getUrl(), psName, psArgs, nearLength);
+        DownloadManagerService.startMission(context, urls, storage, kind, threads, currentInfo.getUrl(), psName, psArgs, nearLength);
 
-        getDialog().dismiss();
+        dismiss();
     }
 }

app/src/main/java/org/schabi/newpipe/fragments/detail/VideoDetailFragment.java

@@ -89,12 +89,14 @@ import org.schabi.newpipe.util.PermissionHelper;
 import org.schabi.newpipe.util.ShareUtils;
 import org.schabi.newpipe.util.StreamItemAdapter;
 import org.schabi.newpipe.util.StreamItemAdapter.StreamSizeWrapper;
+import org.schabi.newpipe.views.AnimatedProgressBar;
 
 import java.io.Serializable;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.LinkedList;
 import java.util.List;
+import java.util.concurrent.TimeUnit;
 
 import icepick.State;
 import io.reactivex.Single;
@@ -118,7 +120,7 @@ public class VideoDetailFragment
     private static final int RELATED_STREAMS_UPDATE_FLAG = 0x1;
     private static final int RESOLUTIONS_MENU_UPDATE_FLAG = 0x2;
     private static final int TOOLBAR_ITEMS_UPDATE_FLAG = 0x4;
-    private static final int COMMENTS_UPDATE_FLAG = 0x4;
+    private static final int COMMENTS_UPDATE_FLAG = 0x8;
 
     private boolean autoPlayEnabled;
     private boolean showRelatedStreams;
@@ -136,6 +138,8 @@ public class VideoDetailFragment
     private Disposable currentWorker;
     @NonNull
     private CompositeDisposable disposables = new CompositeDisposable();
+    @Nullable
+    private Disposable positionSubscriber = null;
 
     private List<VideoStream> sortedVideoStreams;
     private int selectedVideoStreamIndex = -1;
@@ -153,6 +157,7 @@ public class VideoDetailFragment
     private View thumbnailBackgroundButton;
     private ImageView thumbnailImageView;
     private ImageView thumbnailPlayButton;
+    private AnimatedProgressBar positionView;
 
     private View videoTitleRoot;
     private TextView videoTitleTextView;
@@ -165,6 +170,7 @@ public class VideoDetailFragment
     private TextView detailControlsDownload;
     private TextView appendControlsDetail;
     private TextView detailDurationView;
+    private TextView detailPositionView;
 
     private LinearLayout videoDescriptionRootLayout;
     private TextView videoUploadDateView;
@@ -259,6 +265,8 @@ public class VideoDetailFragment
         // Check if it was loading when the fragment was stopped/paused,
         if (wasLoading.getAndSet(false)) {
             selectAndLoadVideo(serviceId, url, name);
+        } else if (currentInfo != null) {
+            updateProgressInfo(currentInfo);
         }
     }
 
@@ -268,8 +276,10 @@ public class VideoDetailFragment
         PreferenceManager.getDefaultSharedPreferences(activity)
                 .unregisterOnSharedPreferenceChangeListener(this);
 
+        if (positionSubscriber != null) positionSubscriber.dispose();
         if (currentWorker != null) currentWorker.dispose();
         if (disposables != null) disposables.clear();
+        positionSubscriber = null;
         currentWorker = null;
         disposables = null;
     }
@@ -462,6 +472,7 @@ public class VideoDetailFragment
         videoTitleTextView = rootView.findViewById(R.id.detail_video_title_view);
         videoTitleToggleArrow = rootView.findViewById(R.id.detail_toggle_description_view);
         videoCountView = rootView.findViewById(R.id.detail_view_count_view);
+        positionView = rootView.findViewById(R.id.position_view);
 
         detailControlsBackground = rootView.findViewById(R.id.detail_controls_background);
         detailControlsPopup = rootView.findViewById(R.id.detail_controls_popup);
@@ -469,6 +480,7 @@ public class VideoDetailFragment
         detailControlsDownload = rootView.findViewById(R.id.detail_controls_download);
         appendControlsDetail = rootView.findViewById(R.id.touch_append_detail);
         detailDurationView = rootView.findViewById(R.id.detail_duration_view);
+        detailPositionView = rootView.findViewById(R.id.detail_position_view);
 
         videoDescriptionRootLayout = rootView.findViewById(R.id.detail_description_root_layout);
         videoUploadDateView = rootView.findViewById(R.id.detail_upload_date_view);
@@ -854,11 +866,11 @@ public class VideoDetailFragment
 
         final PlayQueue itemQueue = new SinglePlayQueue(currentInfo);
         if (append) {
-            NavigationHelper.enqueueOnPopupPlayer(activity, itemQueue);
+            NavigationHelper.enqueueOnPopupPlayer(activity, itemQueue, false);
         } else {
             Toast.makeText(activity, R.string.popup_playing_toast, Toast.LENGTH_SHORT).show();
             final Intent intent = NavigationHelper.getPlayerIntent(
-                    activity, PopupVideoPlayer.class, itemQueue, getSelectedVideoStream().resolution
+                    activity, PopupVideoPlayer.class, itemQueue, getSelectedVideoStream().resolution, true
             );
             activity.startService(intent);
         }
@@ -878,9 +890,9 @@ public class VideoDetailFragment
     private void openNormalBackgroundPlayer(final boolean append) {
         final PlayQueue itemQueue = new SinglePlayQueue(currentInfo);
         if (append) {
-            NavigationHelper.enqueueOnBackgroundPlayer(activity, itemQueue);
+            NavigationHelper.enqueueOnBackgroundPlayer(activity, itemQueue, false);
         } else {
-            NavigationHelper.playOnBackgroundPlayer(activity, itemQueue);
+            NavigationHelper.playOnBackgroundPlayer(activity, itemQueue, true);
         }
     }
 
@@ -890,7 +902,7 @@ public class VideoDetailFragment
         mIntent = NavigationHelper.getPlayerIntent(activity,
                 MainVideoPlayer.class,
                 playQueue,
-                getSelectedVideoStream().getResolution());
+                getSelectedVideoStream().getResolution(), true);
         startActivity(mIntent);
     }
 
@@ -996,6 +1008,8 @@ public class VideoDetailFragment
         animateView(spinnerToolbar, false, 200);
         animateView(thumbnailPlayButton, false, 50);
         animateView(detailDurationView, false, 100);
+        animateView(detailPositionView, false, 100);
+        animateView(positionView, false, 50);
 
         videoTitleTextView.setText(name != null ? name : "");
         videoTitleTextView.setMaxLines(1);
@@ -1110,6 +1124,7 @@ public class VideoDetailFragment
             videoUploadDateView.setText(Localization.localizeDate(activity, info.getUploadDate()));
         }
         prepareDescription(info.getDescription());
+        updateProgressInfo(info);
 
         animateView(spinnerToolbar, true, 500);
         setupActionBar(info);
@@ -1159,7 +1174,7 @@ public class VideoDetailFragment
                 downloadDialog.setSelectedVideoStream(selectedVideoStreamIndex);
                 downloadDialog.setSubtitleStreams(currentInfo.getSubtitles());
 
-                downloadDialog.show(activity.getSupportFragmentManager(), "downloadDialog");
+                downloadDialog.show(getActivity().getSupportFragmentManager(), "downloadDialog");
             } catch (Exception e) {
                 ErrorActivity.ErrorInfo info = ErrorActivity.ErrorInfo.make(UserAction.UI_ERROR,
                         ServiceList.all()
@@ -1184,9 +1199,7 @@ public class VideoDetailFragment
     protected boolean onError(Throwable exception) {
         if (super.onError(exception)) return true;
 
-        if (exception instanceof YoutubeStreamExtractor.GemaException) {
+        else if (exception instanceof ContentNotAvailableException) {
-            onBlockedByGemaError();
-        } else if (exception instanceof ContentNotAvailableException) {
             showError(getString(R.string.content_not_available), false);
         } else {
             int errorId = exception instanceof YoutubeStreamExtractor.DecryptException
@@ -1204,14 +1217,36 @@ public class VideoDetailFragment
         return true;
     }
 
-    public void onBlockedByGemaError() {
+    private void updateProgressInfo(@NonNull final StreamInfo info) {
-        thumbnailBackgroundButton.setOnClickListener((View v) -> {
+        if (positionSubscriber != null) {
-            Intent intent = new Intent();
+            positionSubscriber.dispose();
-            intent.setAction(Intent.ACTION_VIEW);
+        }
-            intent.setData(Uri.parse(getString(R.string.c3s_url)));
+        final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(activity);
-            startActivity(intent);
+        final boolean playbackResumeEnabled =
-        });
+                prefs.getBoolean(activity.getString(R.string.enable_watch_history_key), true)
-
+                        && prefs.getBoolean(activity.getString(R.string.enable_playback_resume_key), true);
-        showError(getString(R.string.blocked_by_gema), false, R.drawable.gruese_die_gema);
+        if (!playbackResumeEnabled || info.getDuration() <= 0) {
+            positionView.setVisibility(View.INVISIBLE);
+            detailPositionView.setVisibility(View.GONE);
+            return;
+        }
+        final HistoryRecordManager recordManager = new HistoryRecordManager(requireContext());
+        positionSubscriber = recordManager.loadStreamState(info)
+                .subscribeOn(Schedulers.io())
+                .onErrorComplete()
+                .observeOn(AndroidSchedulers.mainThread())
+                .subscribe(state -> {
+                    final int seconds = (int) TimeUnit.MILLISECONDS.toSeconds(state.getProgressTime());
+                    positionView.setMax((int) info.getDuration());
+                    positionView.setProgressAnimated(seconds);
+                    detailPositionView.setText(Localization.getDurationString(seconds));
+                    animateView(positionView, true, 500);
+                    animateView(detailPositionView, true, 500);
+                }, e -> {
+                    if (DEBUG) e.printStackTrace();
+                }, () -> {
+                    animateView(positionView, false, 500);
+                    animateView(detailPositionView, false, 500);
+                });
     }
 }

app/src/main/java/org/schabi/newpipe/fragments/list/BaseListFragment.java

@@ -65,6 +65,12 @@ public abstract class BaseListFragment<I, N> extends BaseStateFragment<I> implem
         infoListAdapter = new InfoListAdapter(activity);
     }
 
+    @Override
+    public void onDetach() {
+        infoListAdapter.dispose();
+        super.onDetach();
+    }
+
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -94,6 +100,8 @@ public abstract class BaseListFragment<I, N> extends BaseStateFragment<I> implem
             }
             updateFlags = 0;
         }
+
+        itemsList.post(infoListAdapter::updateStates);
     }
 
     /*//////////////////////////////////////////////////////////////////////////

app/src/main/java/org/schabi/newpipe/fragments/list/channel/ChannelFragment.java

@@ -386,11 +386,11 @@ public class ChannelFragment extends BaseListInfoFragment<ChannelInfo> {
         monitorSubscription(result);
 
         headerPlayAllButton.setOnClickListener(
-                view -> NavigationHelper.playOnMainPlayer(activity, getPlayQueue()));
+                view -> NavigationHelper.playOnMainPlayer(activity, getPlayQueue(), false));
         headerPopupButton.setOnClickListener(
-                view -> NavigationHelper.playOnPopupPlayer(activity, getPlayQueue()));
+                view -> NavigationHelper.playOnPopupPlayer(activity, getPlayQueue(), false));
         headerBackgroundButton.setOnClickListener(
-                view -> NavigationHelper.playOnBackgroundPlayer(activity, getPlayQueue()));
+                view -> NavigationHelper.playOnBackgroundPlayer(activity, getPlayQueue(), false));
     }
 
     private PlayQueue getPlayQueue() {

app/src/main/java/org/schabi/newpipe/fragments/list/playlist/PlaylistFragment.java

@@ -252,19 +252,19 @@ public class PlaylistFragment extends BaseListInfoFragment<PlaylistInfo> {
                 .subscribe(getPlaylistBookmarkSubscriber());
 
         headerPlayAllButton.setOnClickListener(view ->
-                NavigationHelper.playOnMainPlayer(activity, getPlayQueue()));
+                NavigationHelper.playOnMainPlayer(activity, getPlayQueue(), false));
         headerPopupButton.setOnClickListener(view ->
-                NavigationHelper.playOnPopupPlayer(activity, getPlayQueue()));
+                NavigationHelper.playOnPopupPlayer(activity, getPlayQueue(), false));
         headerBackgroundButton.setOnClickListener(view ->
-                NavigationHelper.playOnBackgroundPlayer(activity, getPlayQueue()));
+                NavigationHelper.playOnBackgroundPlayer(activity, getPlayQueue(), false));
 
         headerPopupButton.setOnLongClickListener(view -> {
-            NavigationHelper.enqueueOnPopupPlayer(activity, getPlayQueue());
+            NavigationHelper.enqueueOnPopupPlayer(activity, getPlayQueue(), true);
             return true;
         });
 
         headerBackgroundButton.setOnLongClickListener(view -> {
-            NavigationHelper.enqueueOnBackgroundPlayer(activity, getPlayQueue());
+            NavigationHelper.enqueueOnBackgroundPlayer(activity, getPlayQueue(), true);
             return true;
         });
     }

app/src/main/java/org/schabi/newpipe/info_list/InfoItemBuilder.java

@@ -2,12 +2,14 @@ package org.schabi.newpipe.info_list;
 
 import android.content.Context;
 import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
 import android.util.Log;
 import android.view.View;
 import android.view.ViewGroup;
 
 import com.nostra13.universalimageloader.core.ImageLoader;
 
+import org.schabi.newpipe.database.stream.model.StreamStateEntity;
 import org.schabi.newpipe.extractor.InfoItem;
 import org.schabi.newpipe.extractor.channel.ChannelInfoItem;
 import org.schabi.newpipe.extractor.comments.CommentsInfoItem;
@@ -59,13 +61,14 @@ public class InfoItemBuilder {
         this.context = context;
     }
 
-    public View buildView(@NonNull ViewGroup parent, @NonNull final InfoItem infoItem) {
+    public View buildView(@NonNull ViewGroup parent, @NonNull final InfoItem infoItem, @Nullable StreamStateEntity state) {
-        return buildView(parent, infoItem, false);
+        return buildView(parent, infoItem, state, false);
     }
 
-    public View buildView(@NonNull ViewGroup parent, @NonNull final InfoItem infoItem, boolean useMiniVariant) {
+    public View buildView(@NonNull ViewGroup parent, @NonNull final InfoItem infoItem,
+                          @Nullable StreamStateEntity state, boolean useMiniVariant) {
         InfoItemHolder holder = holderFromInfoType(parent, infoItem.getInfoType(), useMiniVariant);
-        holder.updateFromItem(infoItem);
+        holder.updateFromItem(infoItem, state);
         return holder.itemView;
     }
 

app/src/main/java/org/schabi/newpipe/info_list/InfoListAdapter.java

@@ -1,22 +1,25 @@
 package org.schabi.newpipe.info_list;
 
 import android.app.Activity;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
 import android.support.v7.widget.GridLayoutManager;
 import android.support.v7.widget.RecyclerView;
 import android.util.Log;
 import android.view.View;
 import android.view.ViewGroup;
 
+import org.schabi.newpipe.database.stream.model.StreamStateEntity;
 import org.schabi.newpipe.extractor.InfoItem;
 import org.schabi.newpipe.extractor.channel.ChannelInfoItem;
 import org.schabi.newpipe.extractor.comments.CommentsInfoItem;
 import org.schabi.newpipe.extractor.playlist.PlaylistInfoItem;
 import org.schabi.newpipe.extractor.stream.StreamInfoItem;
+import org.schabi.newpipe.info_list.holder.ChannelGridInfoItemHolder;
 import org.schabi.newpipe.info_list.holder.ChannelInfoItemHolder;
 import org.schabi.newpipe.info_list.holder.ChannelMiniInfoItemHolder;
 import org.schabi.newpipe.info_list.holder.CommentsInfoItemHolder;
 import org.schabi.newpipe.info_list.holder.CommentsMiniInfoItemHolder;
-import org.schabi.newpipe.info_list.holder.ChannelGridInfoItemHolder;
 import org.schabi.newpipe.info_list.holder.InfoItemHolder;
 import org.schabi.newpipe.info_list.holder.PlaylistGridInfoItemHolder;
 import org.schabi.newpipe.info_list.holder.PlaylistInfoItemHolder;
@@ -50,7 +53,7 @@ import java.util.List;
  * along with NewPipe.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-public class InfoListAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
+public class InfoListAdapter extends StateObjectsListAdapter {
     private static final String TAG = InfoListAdapter.class.getSimpleName();
     private static final boolean DEBUG = false;
 
@@ -87,6 +90,7 @@ public class InfoListAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolde
     }
 
     public InfoListAdapter(Activity a) {
+        super(a.getApplicationContext());
         infoItemBuilder = new InfoItemBuilder(a);
         infoItemList = new ArrayList<>();
     }
@@ -115,50 +119,64 @@ public class InfoListAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolde
         this.useGridVariant = useGridVariant;
     }
 
-    public void addInfoItemList(List<InfoItem> data) {
+    public void addInfoItemList(@Nullable final List<InfoItem> data) {
         if (data != null) {
-            if (DEBUG) {
+            loadStates(data, infoItemList.size(), () -> addInfoItemListImpl(data));
-                Log.d(TAG, "addInfoItemList() before > infoItemList.size() = " + infoItemList.size() + ", data.size() = " + data.size());
-            }
-
-            int offsetStart = sizeConsideringHeaderOffset();
-            infoItemList.addAll(data);
-
-            if (DEBUG) {
-                Log.d(TAG, "addInfoItemList() after > offsetStart = " + offsetStart + ", infoItemList.size() = " + infoItemList.size() + ", header = " + header + ", footer = " + footer + ", showFooter = " + showFooter);
-            }
-
-            notifyItemRangeInserted(offsetStart, data.size());
-
-            if (footer != null && showFooter) {
-                int footerNow = sizeConsideringHeaderOffset();
-                notifyItemMoved(offsetStart, footerNow);
-
-                if (DEBUG) Log.d(TAG, "addInfoItemList() footer from " + offsetStart + " to " + footerNow);
-            }
         }
     }
 
-    public void addInfoItem(InfoItem data) {
+    private void addInfoItemListImpl(@NonNull List<InfoItem> data) {
+        if (DEBUG) {
+            Log.d(TAG, "addInfoItemList() before > infoItemList.size() = " + infoItemList.size() + ", data.size() = " + data.size());
+        }
+
+        int offsetStart = sizeConsideringHeaderOffset();
+        infoItemList.addAll(data);
+
+        if (DEBUG) {
+            Log.d(TAG, "addInfoItemList() after > offsetStart = " + offsetStart + ", infoItemList.size() = " + infoItemList.size() + ", header = " + header + ", footer = " + footer + ", showFooter = " + showFooter);
+        }
+
+        notifyItemRangeInserted(offsetStart, data.size());
+
+        if (footer != null && showFooter) {
+            int footerNow = sizeConsideringHeaderOffset();
+            notifyItemMoved(offsetStart, footerNow);
+
+            if (DEBUG) Log.d(TAG, "addInfoItemList() footer from " + offsetStart + " to " + footerNow);
+        }
+    }
+
+    public void addInfoItem(@Nullable InfoItem data) {
         if (data != null) {
-            if (DEBUG) {
+            loadState(data, infoItemList.size(), () -> addInfoItemImpl(data));
-                Log.d(TAG, "addInfoItem() before > infoItemList.size() = " + infoItemList.size() + ", thread = " + Thread.currentThread());
+        }
-            }
+    }
 
-            int positionInserted = sizeConsideringHeaderOffset();
+    private void addInfoItemImpl(@NonNull InfoItem data) {
-            infoItemList.add(data);
+        if (DEBUG) {
+            Log.d(TAG, "addInfoItem() before > infoItemList.size() = " + infoItemList.size() + ", thread = " + Thread.currentThread());
+        }
 
-            if (DEBUG) {
+        int positionInserted = sizeConsideringHeaderOffset();
-                Log.d(TAG, "addInfoItem() after > position = " + positionInserted + ", infoItemList.size() = " + infoItemList.size() + ", header = " + header + ", footer = " + footer + ", showFooter = " + showFooter);
+        infoItemList.add(data);
-            }
-            notifyItemInserted(positionInserted);
 
-            if (footer != null && showFooter) {
+        if (DEBUG) {
-                int footerNow = sizeConsideringHeaderOffset();
+            Log.d(TAG, "addInfoItem() after > position = " + positionInserted + ", infoItemList.size() = " + infoItemList.size() + ", header = " + header + ", footer = " + footer + ", showFooter = " + showFooter);
-                notifyItemMoved(positionInserted, footerNow);
+        }
+        notifyItemInserted(positionInserted);
 
-                if (DEBUG) Log.d(TAG, "addInfoItem() footer from " + positionInserted + " to " + footerNow);
+        if (footer != null && showFooter) {
-            }
+            int footerNow = sizeConsideringHeaderOffset();
+            notifyItemMoved(positionInserted, footerNow);
+
+            if (DEBUG) Log.d(TAG, "addInfoItem() footer from " + positionInserted + " to " + footerNow);
+        }
+    }
+
+    public void updateStates() {
+        if (!infoItemList.isEmpty()) {
+            updateAllStates(infoItemList);
         }
     }
 
@@ -167,6 +185,7 @@ public class InfoListAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolde
             return;
         }
         infoItemList.clear();
+        clearStates();
         notifyDataSetChanged();
     }
 
@@ -240,8 +259,9 @@ public class InfoListAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolde
         }
     }
 
+    @NonNull
     @Override
-    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int type) {
+    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int type) {
         if (DEBUG)
             Log.d(TAG, "onCreateViewHolder() called with: parent = [" + parent + "], type = [" + type + "]");
         switch (type) {
@@ -278,13 +298,13 @@ public class InfoListAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolde
     }
 
     @Override
-    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
+    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
         if (DEBUG) Log.d(TAG, "onBindViewHolder() called with: holder = [" + holder.getClass().getSimpleName() + "], position = [" + position + "]");
         if (holder instanceof InfoItemHolder) {
             // If header isn't null, offset the items by -1
             if (header != null) position--;
 
-            ((InfoItemHolder) holder).updateFromItem(infoItemList.get(position));
+            ((InfoItemHolder) holder).updateFromItem(infoItemList.get(position), getState(position));
         } else if (holder instanceof HFHolder && position == 0 && header != null) {
             ((HFHolder) holder).view = header;
         } else if (holder instanceof HFHolder && position == sizeConsideringHeaderOffset() && footer != null && showFooter) {
@@ -292,6 +312,28 @@ public class InfoListAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolde
         }
     }
 
+    @Override
+    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position, @NonNull List<Object> payloads) {
+        if (!payloads.isEmpty() && holder instanceof InfoItemHolder) {
+            for (Object payload : payloads) {
+                if (payload instanceof StreamStateEntity) {
+                    ((InfoItemHolder) holder).updateState(infoItemList.get(header == null ? position : position - 1),
+                            (StreamStateEntity) payload);
+                } else if (payload instanceof Boolean) {
+                    ((InfoItemHolder) holder).updateState(infoItemList.get(header == null ? position : position - 1),
+                            null);
+                }
+            }
+        } else {
+            onBindViewHolder(holder, position);
+        }
+    }
+
+    @Override
+    protected void onItemStateChanged(int position, @Nullable StreamStateEntity state) {
+        notifyItemChanged(header == null ? position : position + 1, state != null ? state : false);
+    }
+
     public GridLayoutManager.SpanSizeLookup getSpanSizeLookup(final int spanCount) {
         return new GridLayoutManager.SpanSizeLookup() {
             @Override

app/src/main/java/org/schabi/newpipe/info_list/StateObjectsListAdapter.java

@@ -0,0 +1,189 @@
+package org.schabi.newpipe.info_list;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.preference.PreferenceManager;
+import android.support.annotation.Nullable;
+import android.support.v7.widget.RecyclerView;
+import android.util.SparseArray;
+
+import org.schabi.newpipe.BuildConfig;
+import org.schabi.newpipe.R;
+import org.schabi.newpipe.database.LocalItem;
+import org.schabi.newpipe.database.stream.model.StreamStateEntity;
+import org.schabi.newpipe.extractor.InfoItem;
+import org.schabi.newpipe.local.history.HistoryRecordManager;
+import org.schabi.newpipe.util.SparseArrayUtils;
+
+import java.util.List;
+import java.util.Objects;
+
+import io.reactivex.android.schedulers.AndroidSchedulers;
+import io.reactivex.disposables.CompositeDisposable;
+
+public abstract class StateObjectsListAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
+
+	private final SparseArray<StreamStateEntity> states;
+	private final HistoryRecordManager recordManager;
+	private final CompositeDisposable stateLoaders;
+	private final Context context;
+
+	public StateObjectsListAdapter(Context context) {
+		this.states = new SparseArray<>();
+		this.recordManager = new HistoryRecordManager(context);
+		this.context = context;
+		this.stateLoaders = new CompositeDisposable();
+	}
+
+	@Nullable
+	public StreamStateEntity getState(int position) {
+		return states.get(position);
+	}
+
+	protected void clearStates() {
+		states.clear();
+	}
+
+	private void appendStates(List<StreamStateEntity> statesEntities, int offset) {
+		for (int i = 0; i < statesEntities.size(); i++) {
+			final StreamStateEntity state = statesEntities.get(i);
+			if (state != null) {
+				states.append(offset + i, state);
+			}
+		}
+	}
+
+	private void appendState(StreamStateEntity statesEntity, int offset) {
+		if (statesEntity != null) {
+			states.append(offset, statesEntity);
+		}
+	}
+
+	protected void removeState(int index) {
+		states.remove(index);
+	}
+
+	protected void moveState(int from, int to) {
+		final StreamStateEntity item = states.get(from);
+		if (from < to) {
+			SparseArrayUtils.shiftItemsDown(states, from, to);
+		} else {
+			SparseArrayUtils.shiftItemsUp(states, to, from);
+		}
+		states.put(to, item);
+	}
+
+	protected void loadStates(List<InfoItem> list, int offset, Runnable callback) {
+		if (isPlaybackStatesVisible()) {
+			stateLoaders.add(
+					recordManager.loadStreamStateBatch(list)
+							.observeOn(AndroidSchedulers.mainThread())
+							.subscribe(streamStateEntities -> {
+								appendStates(streamStateEntities, offset);
+								callback.run();
+							}, throwable -> {
+								if (BuildConfig.DEBUG) throwable.printStackTrace();
+								callback.run();
+							})
+			);
+		} else {
+			callback.run();
+		}
+	}
+
+	protected void loadState(InfoItem item, int offset, Runnable callback) {
+		if (isPlaybackStatesVisible()) {
+			stateLoaders.add(
+					recordManager.loadStreamState(item)
+							.observeOn(AndroidSchedulers.mainThread())
+							.subscribe(streamStateEntities -> {
+								appendState(streamStateEntities[0], offset);
+								callback.run();
+							}, throwable -> {
+								if (BuildConfig.DEBUG) throwable.printStackTrace();
+								callback.run();
+							})
+			);
+		} else {
+			callback.run();
+		}
+	}
+
+	protected void loadStatesForLocal(List<? extends LocalItem> list, int offset, Runnable callback) {
+		if (isPlaybackStatesVisible()) {
+			stateLoaders.add(
+					recordManager.loadLocalStreamStateBatch(list)
+							.observeOn(AndroidSchedulers.mainThread())
+							.subscribe(streamStateEntities -> {
+								appendStates(streamStateEntities, offset);
+								callback.run();
+							}, throwable -> {
+								if (BuildConfig.DEBUG) throwable.printStackTrace();
+								callback.run();
+							})
+			);
+		} else {
+			callback.run();
+		}
+	}
+
+	private void processStatesUpdates(List<StreamStateEntity> streamStateEntities) {
+		for (int i = 0; i < streamStateEntities.size(); i++) {
+			final StreamStateEntity newState = streamStateEntities.get(i);
+			if (!Objects.equals(states.get(i), newState)) {
+				if (newState == null) {
+					states.remove(i);
+				} else {
+					states.put(i, newState);
+				}
+				onItemStateChanged(i, newState);
+			}
+		}
+	}
+
+	protected void updateAllStates(List<InfoItem> list) {
+		if (isPlaybackStatesVisible()) {
+			stateLoaders.add(
+					recordManager.loadStreamStateBatch(list)
+							.observeOn(AndroidSchedulers.mainThread())
+							.subscribe(this::processStatesUpdates, throwable -> {
+								if (BuildConfig.DEBUG) throwable.printStackTrace();
+							})
+			);
+		} else {
+			final int[] positions = SparseArrayUtils.getKeys(states);
+			states.clear();
+			for (int pos : positions) onItemStateChanged(pos, null);
+		}
+	}
+
+	protected void updateAllLocalStates(List<? extends LocalItem> list) {
+		if (isPlaybackStatesVisible()) {
+			stateLoaders.add(
+					recordManager.loadLocalStreamStateBatch(list)
+							.observeOn(AndroidSchedulers.mainThread())
+							.subscribe(this::processStatesUpdates, throwable -> {
+								if (BuildConfig.DEBUG) throwable.printStackTrace();
+							})
+			);
+		} else {
+			final int[] positions = SparseArrayUtils.getKeys(states);
+			states.clear();
+			for (int pos : positions) onItemStateChanged(pos, null);
+		}
+	}
+
+	public void dispose() {
+		stateLoaders.dispose();
+	}
+
+	protected boolean isPlaybackStatesVisible() {
+		final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
+		return prefs.getBoolean(context.getString(R.string.enable_watch_history_key), true)
+				&& prefs.getBoolean(context.getString(R.string.enable_playback_resume_key), true)
+				&& prefs.getBoolean(context.getString(R.string.enable_playback_state_lists_key), true);
+	}
+
+	protected abstract void onItemStateChanged(int position, @Nullable StreamStateEntity state);
+
+}

app/src/main/java/org/schabi/newpipe/info_list/holder/ChannelInfoItemHolder.java

@@ -1,9 +1,11 @@
 package org.schabi.newpipe.info_list.holder;
 
+import android.support.annotation.Nullable;
 import android.view.ViewGroup;
 import android.widget.TextView;
 
 import org.schabi.newpipe.R;
+import org.schabi.newpipe.database.stream.model.StreamStateEntity;
 import org.schabi.newpipe.extractor.InfoItem;
 import org.schabi.newpipe.extractor.channel.ChannelInfoItem;
 import org.schabi.newpipe.info_list.InfoItemBuilder;
@@ -38,8 +40,8 @@ public class ChannelInfoItemHolder extends ChannelMiniInfoItemHolder {
     }
 
     @Override
-    public void updateFromItem(final InfoItem infoItem) {
+    public void updateFromItem(final InfoItem infoItem, @Nullable final StreamStateEntity state) {
-        super.updateFromItem(infoItem);
+        super.updateFromItem(infoItem, state);
 
         if (!(infoItem instanceof ChannelInfoItem)) return;
         final ChannelInfoItem item = (ChannelInfoItem) infoItem;

app/src/main/java/org/schabi/newpipe/info_list/holder/ChannelMiniInfoItemHolder.java

@@ -1,9 +1,11 @@
 package org.schabi.newpipe.info_list.holder;
 
+import android.support.annotation.Nullable;
 import android.view.ViewGroup;
 import android.widget.TextView;
 
 import org.schabi.newpipe.R;
+import org.schabi.newpipe.database.stream.model.StreamStateEntity;
 import org.schabi.newpipe.extractor.InfoItem;
 import org.schabi.newpipe.extractor.channel.ChannelInfoItem;
 import org.schabi.newpipe.info_list.InfoItemBuilder;
@@ -30,7 +32,7 @@ public class ChannelMiniInfoItemHolder extends InfoItemHolder {
     }
 
     @Override
-    public void updateFromItem(final InfoItem infoItem) {
+    public void updateFromItem(final InfoItem infoItem, @Nullable final StreamStateEntity state) {
         if (!(infoItem instanceof ChannelInfoItem)) return;
         final ChannelInfoItem item = (ChannelInfoItem) infoItem;
 

app/src/main/java/org/schabi/newpipe/info_list/holder/CommentsInfoItemHolder.java

@@ -1,14 +1,14 @@
 package org.schabi.newpipe.info_list.holder;
 
+import android.support.annotation.Nullable;
 import android.view.ViewGroup;
 import android.widget.TextView;
 
 import org.schabi.newpipe.R;
+import org.schabi.newpipe.database.stream.model.StreamStateEntity;
 import org.schabi.newpipe.extractor.InfoItem;
-import org.schabi.newpipe.extractor.channel.ChannelInfoItem;
 import org.schabi.newpipe.extractor.comments.CommentsInfoItem;
 import org.schabi.newpipe.info_list.InfoItemBuilder;
-import org.schabi.newpipe.util.Localization;
 
 /*
  * Created by Christian Schabesberger on 12.02.17.
@@ -41,8 +41,8 @@ public class CommentsInfoItemHolder extends CommentsMiniInfoItemHolder {
     }
 
     @Override
-    public void updateFromItem(final InfoItem infoItem) {
+    public void updateFromItem(final InfoItem infoItem, @Nullable final StreamStateEntity state) {
-        super.updateFromItem(infoItem);
+        super.updateFromItem(infoItem, state);
 
         if (!(infoItem instanceof CommentsInfoItem)) return;
         final CommentsInfoItem item = (CommentsInfoItem) infoItem;

app/src/main/java/org/schabi/newpipe/info_list/holder/CommentsMiniInfoItemHolder.java

@@ -1,5 +1,6 @@
 package org.schabi.newpipe.info_list.holder;
 
+import android.support.annotation.Nullable;
 import android.support.v7.app.AppCompatActivity;
 import android.text.util.Linkify;
 import android.view.View;
@@ -8,6 +9,7 @@ import android.widget.TextView;
 
 import org.jsoup.helper.StringUtil;
 import org.schabi.newpipe.R;
+import org.schabi.newpipe.database.stream.model.StreamStateEntity;
 import org.schabi.newpipe.extractor.InfoItem;
 import org.schabi.newpipe.extractor.comments.CommentsInfoItem;
 import org.schabi.newpipe.info_list.InfoItemBuilder;
@@ -65,7 +67,7 @@ public class CommentsMiniInfoItemHolder extends InfoItemHolder {
     }
 
     @Override
-    public void updateFromItem(final InfoItem infoItem) {
+    public void updateFromItem(final InfoItem infoItem, @Nullable final StreamStateEntity state) {
         if (!(infoItem instanceof CommentsInfoItem)) return;
         final CommentsInfoItem item = (CommentsInfoItem) infoItem;
 

app/src/main/java/org/schabi/newpipe/info_list/holder/InfoItemHolder.java

@@ -1,9 +1,11 @@
 package org.schabi.newpipe.info_list.holder;
 
+import android.support.annotation.Nullable;
 import android.support.v7.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.ViewGroup;
 
+import org.schabi.newpipe.database.stream.model.StreamStateEntity;
 import org.schabi.newpipe.extractor.InfoItem;
 import org.schabi.newpipe.info_list.InfoItemBuilder;
 
@@ -35,5 +37,8 @@ public abstract class InfoItemHolder extends RecyclerView.ViewHolder {
         this.itemBuilder = infoItemBuilder;
     }
 
-    public abstract void updateFromItem(final InfoItem infoItem);
+    public abstract void updateFromItem(final InfoItem infoItem, @Nullable final StreamStateEntity state);
+
+    public void updateState(final InfoItem infoItem, @Nullable final StreamStateEntity state) {
+    }
 }

app/src/main/java/org/schabi/newpipe/info_list/holder/PlaylistMiniInfoItemHolder.java

@@ -1,10 +1,12 @@
 package org.schabi.newpipe.info_list.holder;
 
+import android.support.annotation.Nullable;
 import android.view.ViewGroup;
 import android.widget.ImageView;
 import android.widget.TextView;
 
 import org.schabi.newpipe.R;
+import org.schabi.newpipe.database.stream.model.StreamStateEntity;
 import org.schabi.newpipe.extractor.InfoItem;
 import org.schabi.newpipe.extractor.playlist.PlaylistInfoItem;
 import org.schabi.newpipe.info_list.InfoItemBuilder;
@@ -30,7 +32,7 @@ public class PlaylistMiniInfoItemHolder extends InfoItemHolder {
     }
 
     @Override
-    public void updateFromItem(final InfoItem infoItem) {
+    public void updateFromItem(final InfoItem infoItem, @Nullable final StreamStateEntity state) {
         if (!(infoItem instanceof PlaylistInfoItem)) return;
         final PlaylistInfoItem item = (PlaylistInfoItem) infoItem;
 

app/src/main/java/org/schabi/newpipe/info_list/holder/StreamInfoItemHolder.java

@@ -1,10 +1,12 @@
 package org.schabi.newpipe.info_list.holder;
 
+import android.support.annotation.Nullable;
 import android.text.TextUtils;
 import android.view.ViewGroup;
 import android.widget.TextView;
 
 import org.schabi.newpipe.R;
+import org.schabi.newpipe.database.stream.model.StreamStateEntity;
 import org.schabi.newpipe.extractor.InfoItem;
 import org.schabi.newpipe.extractor.stream.StreamInfoItem;
 import org.schabi.newpipe.info_list.InfoItemBuilder;
@@ -40,8 +42,8 @@ public class StreamInfoItemHolder extends StreamMiniInfoItemHolder {
     }
 
     @Override
-    public void updateFromItem(final InfoItem infoItem) {
+    public void updateFromItem(final InfoItem infoItem, @Nullable final StreamStateEntity state) {
-        super.updateFromItem(infoItem);
+        super.updateFromItem(infoItem, state);
 
         if (!(infoItem instanceof StreamInfoItem)) return;
         final StreamInfoItem item = (StreamInfoItem) infoItem;

app/src/main/java/org/schabi/newpipe/info_list/holder/StreamMiniInfoItemHolder.java

@@ -1,5 +1,6 @@
 package org.schabi.newpipe.info_list.holder;
 
+import android.support.annotation.Nullable;
 import android.support.v4.content.ContextCompat;
 import android.view.View;
 import android.view.ViewGroup;
@@ -7,12 +8,17 @@ import android.widget.ImageView;
 import android.widget.TextView;
 
 import org.schabi.newpipe.R;
+import org.schabi.newpipe.database.stream.model.StreamStateEntity;
 import org.schabi.newpipe.extractor.InfoItem;
 import org.schabi.newpipe.extractor.stream.StreamInfoItem;
 import org.schabi.newpipe.extractor.stream.StreamType;
 import org.schabi.newpipe.info_list.InfoItemBuilder;
+import org.schabi.newpipe.util.AnimationUtils;
 import org.schabi.newpipe.util.ImageDisplayConstants;
 import org.schabi.newpipe.util.Localization;
+import org.schabi.newpipe.views.AnimatedProgressBar;
+
+import java.util.concurrent.TimeUnit;
 
 public class StreamMiniInfoItemHolder extends InfoItemHolder {
 
@@ -20,6 +26,7 @@ public class StreamMiniInfoItemHolder extends InfoItemHolder {
     public final TextView itemVideoTitleView;
     public final TextView itemUploaderView;
     public final TextView itemDurationView;
+    public final AnimatedProgressBar itemProgressView;
 
     StreamMiniInfoItemHolder(InfoItemBuilder infoItemBuilder, int layoutId, ViewGroup parent) {
         super(infoItemBuilder, layoutId, parent);
@@ -28,6 +35,7 @@ public class StreamMiniInfoItemHolder extends InfoItemHolder {
         itemVideoTitleView = itemView.findViewById(R.id.itemVideoTitleView);
         itemUploaderView = itemView.findViewById(R.id.itemUploaderView);
         itemDurationView = itemView.findViewById(R.id.itemDurationView);
+        itemProgressView = itemView.findViewById(R.id.itemProgressView);
     }
 
     public StreamMiniInfoItemHolder(InfoItemBuilder infoItemBuilder, ViewGroup parent) {
@@ -35,7 +43,7 @@ public class StreamMiniInfoItemHolder extends InfoItemHolder {
     }
 
     @Override
-    public void updateFromItem(final InfoItem infoItem) {
+    public void updateFromItem(final InfoItem infoItem, @Nullable final StreamStateEntity state) {
         if (!(infoItem instanceof StreamInfoItem)) return;
         final StreamInfoItem item = (StreamInfoItem) infoItem;
 
@@ -47,13 +55,22 @@ public class StreamMiniInfoItemHolder extends InfoItemHolder {
             itemDurationView.setBackgroundColor(ContextCompat.getColor(itemBuilder.getContext(),
                     R.color.duration_background_color));
             itemDurationView.setVisibility(View.VISIBLE);
+            if (state != null) {
+                itemProgressView.setVisibility(View.VISIBLE);
+                itemProgressView.setMax((int) item.getDuration());
+                itemProgressView.setProgress((int) TimeUnit.MILLISECONDS.toSeconds(state.getProgressTime()));
+            } else {
+                itemProgressView.setVisibility(View.GONE);
+            }
         } else if (item.getStreamType() == StreamType.LIVE_STREAM) {
             itemDurationView.setText(R.string.duration_live);
             itemDurationView.setBackgroundColor(ContextCompat.getColor(itemBuilder.getContext(),
                     R.color.live_duration_background_color));
             itemDurationView.setVisibility(View.VISIBLE);
+            itemProgressView.setVisibility(View.GONE);
         } else {
             itemDurationView.setVisibility(View.GONE);
+            itemProgressView.setVisibility(View.GONE);
         }
 
         // Default thumbnail is shown on error, while loading and if the url is empty
@@ -83,6 +100,22 @@ public class StreamMiniInfoItemHolder extends InfoItemHolder {
         }
     }
 
+    @Override
+    public void updateState(final InfoItem infoItem, @Nullable final StreamStateEntity state) {
+        final StreamInfoItem item = (StreamInfoItem) infoItem;
+        if (state != null && item.getDuration() > 0 && item.getStreamType() != StreamType.LIVE_STREAM) {
+            itemProgressView.setMax((int) item.getDuration());
+            if (itemProgressView.getVisibility() == View.VISIBLE) {
+                itemProgressView.setProgressAnimated((int) TimeUnit.MILLISECONDS.toSeconds(state.getProgressTime()));
+            } else {
+                itemProgressView.setProgress((int) TimeUnit.MILLISECONDS.toSeconds(state.getProgressTime()));
+                AnimationUtils.animateView(itemProgressView, true, 500);
+            }
+        } else if (itemProgressView.getVisibility() == View.VISIBLE) {
+            AnimationUtils.animateView(itemProgressView, false, 500);
+        }
+    }
+
     private void enableLongClick(final StreamInfoItem item) {
         itemView.setLongClickable(true);
         itemView.setOnLongClickListener(view -> {

app/src/main/java/org/schabi/newpipe/local/BaseLocalListFragment.java

@@ -76,6 +76,8 @@ public abstract class BaseLocalListFragment<I, N> extends BaseStateFragment<I>
             }
             updateFlags = 0;
         }
+
+        itemsList.post(itemListAdapter::updateStates);
     }
 
     /*//////////////////////////////////////////////////////////////////////////
@@ -150,6 +152,7 @@ public abstract class BaseLocalListFragment<I, N> extends BaseStateFragment<I>
     public void onDestroyView() {
         super.onDestroyView();
         itemsList = null;
+        itemListAdapter.dispose();
         itemListAdapter = null;
     }
 

app/src/main/java/org/schabi/newpipe/local/LocalItemListAdapter.java

@@ -1,6 +1,8 @@
 package org.schabi.newpipe.local;
 
 import android.app.Activity;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
 import android.support.v7.widget.GridLayoutManager;
 import android.support.v7.widget.RecyclerView;
 import android.util.Log;
@@ -8,6 +10,8 @@ import android.view.View;
 import android.view.ViewGroup;
 
 import org.schabi.newpipe.database.LocalItem;
+import org.schabi.newpipe.database.stream.model.StreamStateEntity;
+import org.schabi.newpipe.info_list.StateObjectsListAdapter;
 import org.schabi.newpipe.local.holder.LocalItemHolder;
 import org.schabi.newpipe.local.holder.LocalPlaylistGridItemHolder;
 import org.schabi.newpipe.local.holder.LocalPlaylistItemHolder;
@@ -45,7 +49,7 @@ import java.util.List;
  * along with NewPipe.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-public class LocalItemListAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
+public class LocalItemListAdapter extends StateObjectsListAdapter {
     
     private static final String TAG = LocalItemListAdapter.class.getSimpleName();
     private static final boolean DEBUG = false;
@@ -72,6 +76,7 @@ public class LocalItemListAdapter extends RecyclerView.Adapter<RecyclerView.View
     private View footer = null;
 
     public LocalItemListAdapter(Activity activity) {
+        super(activity.getApplicationContext());
         localItemBuilder = new LocalItemBuilder(activity);
         localItems = new ArrayList<>();
         dateFormat = DateFormat.getDateInstance(DateFormat.SHORT,
@@ -86,39 +91,49 @@ public class LocalItemListAdapter extends RecyclerView.Adapter<RecyclerView.View
         localItemBuilder.setOnItemSelectedListener(null);
     }
 
-    public void addItems(List<? extends LocalItem> data) {
+    public void addItems(@Nullable List<? extends LocalItem> data) {
         if (data != null) {
-            if (DEBUG) {
+            loadStatesForLocal(data, localItems.size(), () -> addItemsImpl(data));
-                Log.d(TAG, "addItems() before > localItems.size() = " +
+        }
-                        localItems.size() + ", data.size() = " + data.size());
+    }
-            }
 
-            int offsetStart = sizeConsideringHeader();
+    private void addItemsImpl(@NonNull List<? extends LocalItem> data) {
-            localItems.addAll(data);
+        if (DEBUG) {
+            Log.d(TAG, "addItems() before > localItems.size() = " +
+                    localItems.size() + ", data.size() = " + data.size());
+        }
 
-            if (DEBUG) {
+        int offsetStart = sizeConsideringHeader();
-                Log.d(TAG, "addItems() after > offsetStart = " + offsetStart +
+        localItems.addAll(data);
-                        ", localItems.size() = " + localItems.size() +
-                        ", header = " + header + ", footer = " + footer +
-                        ", showFooter = " + showFooter);
-            }
 
-            notifyItemRangeInserted(offsetStart, data.size());
+        if (DEBUG) {
+            Log.d(TAG, "addItems() after > offsetStart = " + offsetStart +
+                    ", localItems.size() = " + localItems.size() +
+                    ", header = " + header + ", footer = " + footer +
+                    ", showFooter = " + showFooter);
+        }
 
-            if (footer != null && showFooter) {
+        notifyItemRangeInserted(offsetStart, data.size());
-                int footerNow = sizeConsideringHeader();
-                notifyItemMoved(offsetStart, footerNow);
 
-                if (DEBUG) Log.d(TAG, "addItems() footer from " + offsetStart +
+        if (footer != null && showFooter) {
-                        " to " + footerNow);
+            int footerNow = sizeConsideringHeader();
-            }
+            notifyItemMoved(offsetStart, footerNow);
+
+            if (DEBUG) Log.d(TAG, "addItems() footer from " + offsetStart +
+                    " to " + footerNow);
+        }
+    }
+
+    public void updateStates() {
+        if (!localItems.isEmpty()) {
+            updateAllLocalStates(localItems);
         }
     }
 
     public void removeItem(final LocalItem data) {
         final int index = localItems.indexOf(data);
-
         localItems.remove(index);
+        removeState(index);
         notifyItemRemoved(index + (header != null ? 1 : 0));
     }
 
@@ -130,6 +145,7 @@ public class LocalItemListAdapter extends RecyclerView.Adapter<RecyclerView.View
         if (actualFrom >= localItems.size() || actualTo >= localItems.size()) return false;
 
         localItems.add(actualTo, localItems.remove(actualFrom));
+        moveState(actualFrom, actualTo);
         notifyItemMoved(fromAdapterPosition, toAdapterPosition);
         return true;
     }
@@ -139,6 +155,7 @@ public class LocalItemListAdapter extends RecyclerView.Adapter<RecyclerView.View
             return;
         }
         localItems.clear();
+        clearStates();
         notifyDataSetChanged();
     }
 
@@ -259,7 +276,7 @@ public class LocalItemListAdapter extends RecyclerView.Adapter<RecyclerView.View
             // If header isn't null, offset the items by -1
             if (header != null) position--;
 
-            ((LocalItemHolder) holder).updateFromItem(localItems.get(position), dateFormat);
+            ((LocalItemHolder) holder).updateFromItem(localItems.get(position), getState(position), dateFormat);
         } else if (holder instanceof HeaderFooterHolder && position == 0 && header != null) {
             ((HeaderFooterHolder) holder).view = header;
         } else if (holder instanceof HeaderFooterHolder && position == sizeConsideringHeader()
@@ -268,6 +285,28 @@ public class LocalItemListAdapter extends RecyclerView.Adapter<RecyclerView.View
         }
     }
 
+    @Override
+    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position, @NonNull List<Object> payloads) {
+        if (!payloads.isEmpty() && holder instanceof LocalItemHolder) {
+            for (Object payload : payloads) {
+                if (payload instanceof StreamStateEntity) {
+                    ((LocalItemHolder) holder).updateState(localItems.get(header == null ? position : position - 1),
+                            (StreamStateEntity) payload);
+                } else if (payload instanceof Boolean) {
+                    ((LocalItemHolder) holder).updateState(localItems.get(header == null ? position : position - 1),
+                            null);
+                }
+            }
+        } else {
+            onBindViewHolder(holder, position);
+        }
+    }
+
+    @Override
+    protected void onItemStateChanged(int position, @Nullable StreamStateEntity state) {
+        notifyItemChanged(header == null ? position : position + 1, state != null ? state : false);
+    }
+
     public GridLayoutManager.SpanSizeLookup getSpanSizeLookup(final int spanCount) {
         return new GridLayoutManager.SpanSizeLookup() {
             @Override

app/src/main/java/org/schabi/newpipe/local/dialog/PlaylistAppendDialog.java

@@ -112,7 +112,10 @@ public final class PlaylistAppendDialog extends PlaylistDialog {
     public void onDestroyView() {
         super.onDestroyView();
         if (playlistReactor != null) playlistReactor.dispose();
-        if (playlistAdapter != null) playlistAdapter.unsetSelectedListener();
+        if (playlistAdapter != null) {
+            playlistAdapter.dispose();
+            playlistAdapter.unsetSelectedListener();
+        }
 
         playlistReactor = null;
         playlistRecyclerView = null;

app/src/main/java/org/schabi/newpipe/local/feed/FeedFragment.java

@@ -21,8 +21,8 @@ import org.schabi.newpipe.extractor.NewPipe;
 import org.schabi.newpipe.extractor.channel.ChannelInfo;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
 import org.schabi.newpipe.fragments.list.BaseListFragment;
-import org.schabi.newpipe.report.UserAction;
 import org.schabi.newpipe.local.subscription.SubscriptionService;
+import org.schabi.newpipe.report.UserAction;
 
 import java.util.Collections;
 import java.util.HashSet;
@@ -262,7 +262,7 @@ public class FeedFragment extends BaseListFragment<List<SubscriptionEntity>, Voi
      * If chosen feed already displayed, then we request another feed from another
      * subscription, until the subscription table runs out of new items.
      * <p>
-     * This Observer is self-contained and will dispose itself when complete. However, this
+     * This Observer is self-contained and will close itself when complete. However, this
      * does not obey the fragment lifecycle and may continue running in the background
      * until it is complete. This is done due to RxJava2 no longer propagate errors once
      * an observer is unsubscribed while the thread process is still running.

app/src/main/java/org/schabi/newpipe/local/history/HistoryRecordManager.java

@@ -26,23 +26,29 @@ import android.support.annotation.NonNull;
 import org.schabi.newpipe.NewPipeDatabase;
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.database.AppDatabase;
+import org.schabi.newpipe.database.LocalItem;
 import org.schabi.newpipe.database.history.dao.SearchHistoryDAO;
 import org.schabi.newpipe.database.history.dao.StreamHistoryDAO;
 import org.schabi.newpipe.database.history.model.SearchHistoryEntry;
 import org.schabi.newpipe.database.history.model.StreamHistoryEntity;
 import org.schabi.newpipe.database.history.model.StreamHistoryEntry;
+import org.schabi.newpipe.database.playlist.PlaylistStreamEntry;
+import org.schabi.newpipe.database.playlist.model.PlaylistStreamEntity;
 import org.schabi.newpipe.database.stream.StreamStatisticsEntry;
 import org.schabi.newpipe.database.stream.dao.StreamDAO;
 import org.schabi.newpipe.database.stream.dao.StreamStateDAO;
 import org.schabi.newpipe.database.stream.model.StreamEntity;
 import org.schabi.newpipe.database.stream.model.StreamStateEntity;
+import org.schabi.newpipe.extractor.InfoItem;
 import org.schabi.newpipe.extractor.stream.StreamInfo;
+import org.schabi.newpipe.player.playqueue.PlayQueueItem;
 
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Date;
 import java.util.List;
 
+import io.reactivex.Completable;
 import io.reactivex.Flowable;
 import io.reactivex.Maybe;
 import io.reactivex.Single;
@@ -80,9 +86,9 @@ public class HistoryRecordManager {
         final Date currentTime = new Date();
         return Maybe.fromCallable(() -> database.runInTransaction(() -> {
             final long streamId = streamTable.upsert(new StreamEntity(info));
-            StreamHistoryEntity latestEntry = streamHistoryTable.getLatestEntry();
+            StreamHistoryEntity latestEntry = streamHistoryTable.getLatestEntry(streamId);
 
-            if (latestEntry != null && latestEntry.getStreamUid() == streamId) {
+            if (latestEntry != null) {
                 streamHistoryTable.delete(latestEntry);
                 latestEntry.setAccessDate(currentTime);
                 latestEntry.setRepeatCount(latestEntry.getRepeatCount() + 1);
@@ -99,7 +105,7 @@ public class HistoryRecordManager {
     }
 
     public Single<Integer> deleteWholeStreamHistory() {
-        return Single.fromCallable(() -> streamHistoryTable.deleteAll())
+        return Single.fromCallable(streamHistoryTable::deleteAll)
                 .subscribeOn(Schedulers.io());
     }
 
@@ -160,7 +166,7 @@ public class HistoryRecordManager {
     }
 
     public Single<Integer> deleteWholeSearchHistory() {
-        return Single.fromCallable(() -> searchHistoryTable.deleteAll())
+        return Single.fromCallable(searchHistoryTable::deleteAll)
                 .subscribeOn(Schedulers.io());
     }
 
@@ -180,21 +186,104 @@ public class HistoryRecordManager {
     // Stream State History
     ///////////////////////////////////////////////////////
 
-    @SuppressWarnings("unused")
+    public Maybe<StreamHistoryEntity> getStreamHistory(final StreamInfo info) {
-    public Maybe<StreamStateEntity> loadStreamState(final StreamInfo info) {
+        return Maybe.fromCallable(() -> {
-        return Maybe.fromCallable(() -> streamTable.upsert(new StreamEntity(info)))
+            final long streamId = streamTable.upsert(new StreamEntity(info));
-                .flatMap(streamId -> streamStateTable.getState(streamId).firstElement())
+            return streamHistoryTable.getLatestEntry(streamId);
-                .flatMap(states -> states.isEmpty() ? Maybe.empty() : Maybe.just(states.get(0)))
+        }).subscribeOn(Schedulers.io());
+    }
+
+    public Maybe<StreamStateEntity> loadStreamState(final PlayQueueItem queueItem) {
+        return queueItem.getStream()
+                .map((info) -> streamTable.upsert(new StreamEntity(info)))
+                .flatMapPublisher(streamStateTable::getState)
+                .firstElement()
+                .flatMap(list -> list.isEmpty() ? Maybe.empty() : Maybe.just(list.get(0)))
+                .filter(state -> state.isValid((int) queueItem.getDuration()))
                 .subscribeOn(Schedulers.io());
     }
 
-    public Maybe<Long> saveStreamState(@NonNull final StreamInfo info, final long progressTime) {
+    public Maybe<StreamStateEntity> loadStreamState(final StreamInfo info) {
-        return Maybe.fromCallable(() -> database.runInTransaction(() -> {
+        return Single.fromCallable(() -> streamTable.upsert(new StreamEntity(info)))
+                .flatMapPublisher(streamStateTable::getState)
+                .firstElement()
+                .flatMap(list -> list.isEmpty() ? Maybe.empty() : Maybe.just(list.get(0)))
+                .filter(state -> state.isValid((int) info.getDuration()))
+                .subscribeOn(Schedulers.io());
+    }
+
+    public Completable saveStreamState(@NonNull final StreamInfo info, final long progressTime) {
+        return Completable.fromAction(() -> database.runInTransaction(() -> {
             final long streamId = streamTable.upsert(new StreamEntity(info));
-            return streamStateTable.upsert(new StreamStateEntity(streamId, progressTime));
+            final StreamStateEntity state = new StreamStateEntity(streamId, progressTime);
+            if (state.isValid((int) info.getDuration())) {
+                streamStateTable.upsert(state);
+            } else {
+                streamStateTable.deleteState(streamId);
+            }
         })).subscribeOn(Schedulers.io());
     }
 
+    public Single<StreamStateEntity[]> loadStreamState(final InfoItem info) {
+        return Single.fromCallable(() -> {
+            final List<StreamEntity> entities = streamTable.getStream(info.getServiceId(), info.getUrl()).blockingFirst();
+            if (entities.isEmpty()) {
+                return new StreamStateEntity[]{null};
+            }
+            final List<StreamStateEntity> states = streamStateTable.getState(entities.get(0).getUid()).blockingFirst();
+            if (states.isEmpty()) {
+                return new StreamStateEntity[]{null};
+            }
+            return new StreamStateEntity[]{states.get(0)};
+        }).subscribeOn(Schedulers.io());
+    }
+
+    public Single<List<StreamStateEntity>> loadStreamStateBatch(final List<InfoItem> infos) {
+        return Single.fromCallable(() -> {
+            final List<StreamStateEntity> result = new ArrayList<>(infos.size());
+            for (InfoItem info : infos) {
+                final List<StreamEntity> entities = streamTable.getStream(info.getServiceId(), info.getUrl()).blockingFirst();
+                if (entities.isEmpty()) {
+                    result.add(null);
+                    continue;
+                }
+                final List<StreamStateEntity> states = streamStateTable.getState(entities.get(0).getUid()).blockingFirst();
+                if (states.isEmpty()) {
+                    result.add(null);
+                    continue;
+                }
+                result.add(states.get(0));
+            }
+            return result;
+        }).subscribeOn(Schedulers.io());
+    }
+
+    public Single<List<StreamStateEntity>> loadLocalStreamStateBatch(final List<? extends LocalItem> items) {
+        return Single.fromCallable(() -> {
+            final List<StreamStateEntity> result = new ArrayList<>(items.size());
+            for (LocalItem item : items) {
+                long streamId;
+                if (item instanceof StreamStatisticsEntry) {
+                    streamId = ((StreamStatisticsEntry) item).streamId;
+                } else if (item instanceof PlaylistStreamEntity) {
+                    streamId = ((PlaylistStreamEntity) item).getStreamUid();
+                } else if (item instanceof PlaylistStreamEntry) {
+                    streamId = ((PlaylistStreamEntry) item).streamId;
+                } else {
+                    result.add(null);
+                    continue;
+                }
+                final List<StreamStateEntity> states = streamStateTable.getState(streamId).blockingFirst();
+                if (states.isEmpty()) {
+                    result.add(null);
+                    continue;
+                }
+                result.add(states.get(0));
+            }
+            return result;
+        }).subscribeOn(Schedulers.io());
+    }
+
     ///////////////////////////////////////////////////////
     // Utility
     ///////////////////////////////////////////////////////

app/src/main/java/org/schabi/newpipe/local/history/StatisticsPlaylistFragment.java

@@ -311,11 +311,11 @@ public class StatisticsPlaylistFragment
         }
 
         headerPlayAllButton.setOnClickListener(view ->
-                NavigationHelper.playOnMainPlayer(activity, getPlayQueue()));
+                NavigationHelper.playOnMainPlayer(activity, getPlayQueue(), false));
         headerPopupButton.setOnClickListener(view ->
-                NavigationHelper.playOnPopupPlayer(activity, getPlayQueue()));
+                NavigationHelper.playOnPopupPlayer(activity, getPlayQueue(), false));
         headerBackgroundButton.setOnClickListener(view ->
-                NavigationHelper.playOnBackgroundPlayer(activity, getPlayQueue()));
+                NavigationHelper.playOnBackgroundPlayer(activity, getPlayQueue(), false));
         sortButton.setOnClickListener(view -> toggleSortMode());
 
         hideLoading();
@@ -378,10 +378,10 @@ public class StatisticsPlaylistFragment
             final int index = Math.max(itemListAdapter.getItemsList().indexOf(item), 0);
             switch (i) {
                 case 0:
-                    NavigationHelper.enqueueOnBackgroundPlayer(context, new SinglePlayQueue(infoItem));
+                    NavigationHelper.enqueueOnBackgroundPlayer(context, new SinglePlayQueue(infoItem), false);
                     break;
                 case 1:
-                    NavigationHelper.enqueueOnPopupPlayer(activity, new SinglePlayQueue(infoItem));
+                    NavigationHelper.enqueueOnPopupPlayer(activity, new SinglePlayQueue(infoItem), false);
                     break;
                 case 2:
                     NavigationHelper.playOnBackgroundPlayer(context, getPlayQueue(index));

app/src/main/java/org/schabi/newpipe/local/holder/LocalItemHolder.java

@@ -1,10 +1,12 @@
 package org.schabi.newpipe.local.holder;
 
+import android.support.annotation.Nullable;
 import android.support.v7.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.ViewGroup;
 
 import org.schabi.newpipe.database.LocalItem;
+import org.schabi.newpipe.database.stream.model.StreamStateEntity;
 import org.schabi.newpipe.local.LocalItemBuilder;
 
 import java.text.DateFormat;
@@ -38,5 +40,8 @@ public abstract class LocalItemHolder extends RecyclerView.ViewHolder {
         this.itemBuilder = itemBuilder;
     }
 
-    public abstract void updateFromItem(final LocalItem item, final DateFormat dateFormat);
+    public abstract void updateFromItem(final LocalItem item, @Nullable final StreamStateEntity state, final DateFormat dateFormat);
+
+    public void updateState(final LocalItem localItem, @Nullable final StreamStateEntity state) {
+    }
 }

app/src/main/java/org/schabi/newpipe/local/holder/LocalPlaylistItemHolder.java

@@ -1,10 +1,12 @@
 package org.schabi.newpipe.local.holder;
 
+import android.support.annotation.Nullable;
 import android.view.View;
 import android.view.ViewGroup;
 
 import org.schabi.newpipe.database.LocalItem;
 import org.schabi.newpipe.database.playlist.PlaylistMetadataEntry;
+import org.schabi.newpipe.database.stream.model.StreamStateEntity;
 import org.schabi.newpipe.local.LocalItemBuilder;
 import org.schabi.newpipe.util.ImageDisplayConstants;
 
@@ -21,7 +23,7 @@ public class LocalPlaylistItemHolder extends PlaylistItemHolder {
     }
 
     @Override
-    public void updateFromItem(final LocalItem localItem, final DateFormat dateFormat) {
+    public void updateFromItem(final LocalItem localItem, @Nullable final StreamStateEntity state, final DateFormat dateFormat) {
         if (!(localItem instanceof PlaylistMetadataEntry)) return;
         final PlaylistMetadataEntry item = (PlaylistMetadataEntry) localItem;
 
@@ -32,6 +34,6 @@ public class LocalPlaylistItemHolder extends PlaylistItemHolder {
         itemBuilder.displayImage(item.thumbnailUrl, itemThumbnailView,
                 ImageDisplayConstants.DISPLAY_PLAYLIST_OPTIONS);
 
-        super.updateFromItem(localItem, dateFormat);
+        super.updateFromItem(localItem, state, dateFormat);
     }
 }

app/src/main/java/org/schabi/newpipe/local/holder/LocalPlaylistStreamItemHolder.java

@@ -1,5 +1,6 @@
 package org.schabi.newpipe.local.holder;
 
+import android.support.annotation.Nullable;
 import android.support.v4.content.ContextCompat;
 import android.view.MotionEvent;
 import android.view.View;
@@ -10,12 +11,16 @@ import android.widget.TextView;
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.database.LocalItem;
 import org.schabi.newpipe.database.playlist.PlaylistStreamEntry;
+import org.schabi.newpipe.database.stream.model.StreamStateEntity;
 import org.schabi.newpipe.extractor.NewPipe;
 import org.schabi.newpipe.local.LocalItemBuilder;
+import org.schabi.newpipe.util.AnimationUtils;
 import org.schabi.newpipe.util.ImageDisplayConstants;
 import org.schabi.newpipe.util.Localization;
+import org.schabi.newpipe.views.AnimatedProgressBar;
 
 import java.text.DateFormat;
+import java.util.concurrent.TimeUnit;
 
 public class LocalPlaylistStreamItemHolder extends LocalItemHolder {
 
@@ -24,6 +29,7 @@ public class LocalPlaylistStreamItemHolder extends LocalItemHolder {
     public final TextView itemAdditionalDetailsView;
     public final TextView itemDurationView;
     public final View itemHandleView;
+    public final AnimatedProgressBar itemProgressView;
 
     LocalPlaylistStreamItemHolder(LocalItemBuilder infoItemBuilder, int layoutId, ViewGroup parent) {
         super(infoItemBuilder, layoutId, parent);
@@ -33,6 +39,7 @@ public class LocalPlaylistStreamItemHolder extends LocalItemHolder {
         itemAdditionalDetailsView = itemView.findViewById(R.id.itemAdditionalDetails);
         itemDurationView = itemView.findViewById(R.id.itemDurationView);
         itemHandleView = itemView.findViewById(R.id.itemHandle);
+        itemProgressView = itemView.findViewById(R.id.itemProgressView);
     }
 
     public LocalPlaylistStreamItemHolder(LocalItemBuilder infoItemBuilder, ViewGroup parent) {
@@ -40,7 +47,7 @@ public class LocalPlaylistStreamItemHolder extends LocalItemHolder {
     }
 
     @Override
-    public void updateFromItem(final LocalItem localItem, final DateFormat dateFormat) {
+    public void updateFromItem(final LocalItem localItem, @Nullable final StreamStateEntity state, final DateFormat dateFormat) {
         if (!(localItem instanceof PlaylistStreamEntry)) return;
         final PlaylistStreamEntry item = (PlaylistStreamEntry) localItem;
 
@@ -53,6 +60,13 @@ public class LocalPlaylistStreamItemHolder extends LocalItemHolder {
             itemDurationView.setBackgroundColor(ContextCompat.getColor(itemBuilder.getContext(),
                     R.color.duration_background_color));
             itemDurationView.setVisibility(View.VISIBLE);
+            if (state != null) {
+                itemProgressView.setVisibility(View.VISIBLE);
+                itemProgressView.setMax((int) item.duration);
+                itemProgressView.setProgress((int) TimeUnit.MILLISECONDS.toSeconds(state.getProgressTime()));
+            } else {
+                itemProgressView.setVisibility(View.GONE);
+            }
         } else {
             itemDurationView.setVisibility(View.GONE);
         }
@@ -79,6 +93,23 @@ public class LocalPlaylistStreamItemHolder extends LocalItemHolder {
         itemHandleView.setOnTouchListener(getOnTouchListener(item));
     }
 
+    @Override
+    public void updateState(LocalItem localItem, @Nullable StreamStateEntity state) {
+        if (!(localItem instanceof PlaylistStreamEntry)) return;
+        final PlaylistStreamEntry item = (PlaylistStreamEntry) localItem;
+        if (state != null && item.duration > 0) {
+            itemProgressView.setMax((int) item.duration);
+            if (itemProgressView.getVisibility() == View.VISIBLE) {
+                itemProgressView.setProgressAnimated((int) TimeUnit.MILLISECONDS.toSeconds(state.getProgressTime()));
+            } else {
+                itemProgressView.setProgress((int) TimeUnit.MILLISECONDS.toSeconds(state.getProgressTime()));
+                AnimationUtils.animateView(itemProgressView, true, 500);
+            }
+        } else if (itemProgressView.getVisibility() == View.VISIBLE) {
+            AnimationUtils.animateView(itemProgressView, false, 500);
+        }
+    }
+
     private View.OnTouchListener getOnTouchListener(final PlaylistStreamEntry item) {
         return (view, motionEvent) -> {
             view.performClick();

app/src/main/java/org/schabi/newpipe/local/holder/LocalStatisticStreamItemHolder.java

@@ -10,12 +10,16 @@ import android.widget.TextView;
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.database.LocalItem;
 import org.schabi.newpipe.database.stream.StreamStatisticsEntry;
+import org.schabi.newpipe.database.stream.model.StreamStateEntity;
 import org.schabi.newpipe.extractor.NewPipe;
 import org.schabi.newpipe.local.LocalItemBuilder;
+import org.schabi.newpipe.util.AnimationUtils;
 import org.schabi.newpipe.util.ImageDisplayConstants;
 import org.schabi.newpipe.util.Localization;
+import org.schabi.newpipe.views.AnimatedProgressBar;
 
 import java.text.DateFormat;
+import java.util.concurrent.TimeUnit;
 
 /*
  * Created by Christian Schabesberger on 01.08.16.
@@ -45,6 +49,7 @@ public class LocalStatisticStreamItemHolder extends LocalItemHolder {
     public final TextView itemDurationView;
     @Nullable
     public final TextView itemAdditionalDetails;
+    public final AnimatedProgressBar itemProgressView;
 
     public LocalStatisticStreamItemHolder(LocalItemBuilder itemBuilder, ViewGroup parent) {
         this(itemBuilder, R.layout.list_stream_item, parent);
@@ -58,6 +63,7 @@ public class LocalStatisticStreamItemHolder extends LocalItemHolder {
         itemUploaderView = itemView.findViewById(R.id.itemUploaderView);
         itemDurationView = itemView.findViewById(R.id.itemDurationView);
         itemAdditionalDetails = itemView.findViewById(R.id.itemAdditionalDetails);
+        itemProgressView = itemView.findViewById(R.id.itemProgressView);
     }
 
     private String getStreamInfoDetailLine(final StreamStatisticsEntry entry,
@@ -70,7 +76,7 @@ public class LocalStatisticStreamItemHolder extends LocalItemHolder {
     }
 
     @Override
-    public void updateFromItem(final LocalItem localItem, final DateFormat dateFormat) {
+    public void updateFromItem(final LocalItem localItem, @Nullable final StreamStateEntity state, final DateFormat dateFormat) {
         if (!(localItem instanceof StreamStatisticsEntry)) return;
         final StreamStatisticsEntry item = (StreamStatisticsEntry) localItem;
 
@@ -82,8 +88,16 @@ public class LocalStatisticStreamItemHolder extends LocalItemHolder {
             itemDurationView.setBackgroundColor(ContextCompat.getColor(itemBuilder.getContext(),
                     R.color.duration_background_color));
             itemDurationView.setVisibility(View.VISIBLE);
+            if (state != null) {
+                itemProgressView.setVisibility(View.VISIBLE);
+                itemProgressView.setMax((int) item.duration);
+                itemProgressView.setProgress((int) TimeUnit.MILLISECONDS.toSeconds(state.getProgressTime()));
+            } else {
+                itemProgressView.setVisibility(View.GONE);
+            }
         } else {
             itemDurationView.setVisibility(View.GONE);
+            itemProgressView.setVisibility(View.GONE);
         }
 
         if (itemAdditionalDetails != null) {
@@ -108,4 +122,21 @@ public class LocalStatisticStreamItemHolder extends LocalItemHolder {
             return true;
         });
     }
+
+    @Override
+    public void updateState(LocalItem localItem, @Nullable StreamStateEntity state) {
+        if (!(localItem instanceof StreamStatisticsEntry)) return;
+        final StreamStatisticsEntry item = (StreamStatisticsEntry) localItem;
+        if (state != null && item.duration > 0) {
+            itemProgressView.setMax((int) item.duration);
+            if (itemProgressView.getVisibility() == View.VISIBLE) {
+                itemProgressView.setProgressAnimated((int) TimeUnit.MILLISECONDS.toSeconds(state.getProgressTime()));
+            } else {
+                itemProgressView.setProgress((int) TimeUnit.MILLISECONDS.toSeconds(state.getProgressTime()));
+                AnimationUtils.animateView(itemProgressView, true, 500);
+            }
+        } else if (itemProgressView.getVisibility() == View.VISIBLE) {
+            AnimationUtils.animateView(itemProgressView, false, 500);
+        }
+    }
 }

app/src/main/java/org/schabi/newpipe/local/holder/PlaylistItemHolder.java

@@ -1,11 +1,13 @@
 package org.schabi.newpipe.local.holder;
 
+import android.support.annotation.Nullable;
 import android.view.ViewGroup;
 import android.widget.ImageView;
 import android.widget.TextView;
 
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.database.LocalItem;
+import org.schabi.newpipe.database.stream.model.StreamStateEntity;
 import org.schabi.newpipe.local.LocalItemBuilder;
 
 import java.text.DateFormat;
@@ -31,7 +33,7 @@ public abstract class PlaylistItemHolder extends LocalItemHolder {
     }
 
     @Override
-    public void updateFromItem(final LocalItem localItem, final DateFormat dateFormat) {
+    public void updateFromItem(final LocalItem localItem, @Nullable final StreamStateEntity state, final DateFormat dateFormat) {
         itemView.setOnClickListener(view -> {
             if (itemBuilder.getOnItemSelectedListener() != null) {
                 itemBuilder.getOnItemSelectedListener().selected(localItem);

app/src/main/java/org/schabi/newpipe/local/holder/RemotePlaylistItemHolder.java

@@ -1,9 +1,11 @@
 package org.schabi.newpipe.local.holder;
 
+import android.support.annotation.Nullable;
 import android.view.ViewGroup;
 
 import org.schabi.newpipe.database.LocalItem;
 import org.schabi.newpipe.database.playlist.model.PlaylistRemoteEntity;
+import org.schabi.newpipe.database.stream.model.StreamStateEntity;
 import org.schabi.newpipe.extractor.NewPipe;
 import org.schabi.newpipe.local.LocalItemBuilder;
 import org.schabi.newpipe.util.ImageDisplayConstants;
@@ -21,7 +23,7 @@ public class RemotePlaylistItemHolder extends PlaylistItemHolder {
     }
 
     @Override
-    public void updateFromItem(final LocalItem localItem, final DateFormat dateFormat) {
+    public void updateFromItem(final LocalItem localItem, @Nullable final StreamStateEntity state, final DateFormat dateFormat) {
         if (!(localItem instanceof PlaylistRemoteEntity)) return;
         final PlaylistRemoteEntity item = (PlaylistRemoteEntity) localItem;
 
@@ -33,6 +35,6 @@ public class RemotePlaylistItemHolder extends PlaylistItemHolder {
         itemBuilder.displayImage(item.getThumbnailUrl(), itemThumbnailView,
                 ImageDisplayConstants.DISPLAY_PLAYLIST_OPTIONS);
 
-        super.updateFromItem(localItem, dateFormat);
+        super.updateFromItem(localItem, state, dateFormat);
     }
 }

app/src/main/java/org/schabi/newpipe/local/playlist/LocalPlaylistFragment.java

@@ -320,11 +320,11 @@ public class LocalPlaylistFragment extends BaseLocalListFragment<List<PlaylistSt
         setVideoCount(itemListAdapter.getItemsList().size());
 
         headerPlayAllButton.setOnClickListener(view ->
-                NavigationHelper.playOnMainPlayer(activity, getPlayQueue()));
+                NavigationHelper.playOnMainPlayer(activity, getPlayQueue(), false));
         headerPopupButton.setOnClickListener(view ->
-                NavigationHelper.playOnPopupPlayer(activity, getPlayQueue()));
+                NavigationHelper.playOnPopupPlayer(activity, getPlayQueue(), false));
         headerBackgroundButton.setOnClickListener(view ->
-                NavigationHelper.playOnBackgroundPlayer(activity, getPlayQueue()));
+                NavigationHelper.playOnBackgroundPlayer(activity, getPlayQueue(), false));
 
         hideLoading();
     }

app/src/main/java/org/schabi/newpipe/local/subscription/SubscriptionFragment.java

@@ -23,7 +23,6 @@ import android.support.annotation.Nullable;
 import android.support.v4.app.FragmentManager;
 import android.support.v4.content.LocalBroadcastManager;
 import android.support.v7.app.ActionBar;
-import android.support.v7.app.AppCompatActivity;
 import android.support.v7.widget.GridLayoutManager;
 import android.support.v7.widget.LinearLayoutManager;
 import android.support.v7.widget.RecyclerView;
@@ -48,10 +47,8 @@ import org.schabi.newpipe.extractor.exceptions.ExtractionException;
 import org.schabi.newpipe.extractor.subscription.SubscriptionExtractor;
 import org.schabi.newpipe.fragments.BaseStateFragment;
 import org.schabi.newpipe.info_list.InfoListAdapter;
-import org.schabi.newpipe.report.UserAction;
 import org.schabi.newpipe.local.subscription.services.SubscriptionsExportService;
 import org.schabi.newpipe.local.subscription.services.SubscriptionsImportService;
-import org.schabi.newpipe.report.ErrorActivity;
 import org.schabi.newpipe.report.UserAction;
 import org.schabi.newpipe.util.FilePickerActivityHelper;
 import org.schabi.newpipe.util.NavigationHelper;
@@ -131,6 +128,12 @@ public class SubscriptionFragment extends BaseStateFragment<List<SubscriptionEnt
         subscriptionService = SubscriptionService.getInstance(activity);
     }
 
+    @Override
+    public void onDetach() {
+        infoListAdapter.dispose();
+        super.onDetach();
+    }
+
     @Nullable
     @Override
     public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
@@ -150,6 +153,8 @@ public class SubscriptionFragment extends BaseStateFragment<List<SubscriptionEnt
             }
             updateFlags = 0;
         }
+
+        itemsList.post(infoListAdapter::updateStates);
     }
 
     @Override

app/src/main/java/org/schabi/newpipe/player/BackgroundPlayer.java

@@ -150,6 +150,7 @@ public final class BackgroundPlayer extends Service {
             lockManager.releaseWifiAndCpu();
         }
         if (basePlayerImpl != null) {
+            basePlayerImpl.savePlaybackState();
             basePlayerImpl.stopActivityBinding();
             basePlayerImpl.destroy();
         }

app/src/main/java/org/schabi/newpipe/player/BasePlayer.java

@@ -23,9 +23,11 @@ import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
+import android.content.SharedPreferences;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.media.AudioManager;
+import android.preference.PreferenceManager;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.util.Log;
@@ -145,6 +147,8 @@ public abstract class BasePlayer implements
     @NonNull
     public static final String APPEND_ONLY = "append_only";
     @NonNull
+    public static final String RESUME_PLAYBACK = "resume_playback";
+    @NonNull
     public static final String SELECT_ON_APPEND = "select_on_append";
 
     /*//////////////////////////////////////////////////////////////////////////
@@ -279,8 +283,23 @@ public abstract class BasePlayer implements
                 ) {
             simpleExoPlayer.seekTo(playQueue.getIndex(), queue.getItem().getRecoveryPosition());
             return;
+        } else if (intent.getBooleanExtra(RESUME_PLAYBACK, false) && isPlaybackResumeEnabled()) {
+            final PlayQueueItem item = queue.getItem();
+            if (item != null && item.getRecoveryPosition() == PlayQueueItem.RECOVERY_UNSET && isPlaybackResumeEnabled()) {
+                final Disposable stateLoader = recordManager.loadStreamState(item)
+                        .observeOn(AndroidSchedulers.mainThread())
+                        .doFinally(() -> initPlayback(queue, repeatMode, playbackSpeed, playbackPitch, playbackSkipSilence,
+                                /*playOnInit=*/true))
+                        .subscribe(
+                                state -> queue.setRecovery(queue.getIndex(), state.getProgressTime()),
+                                error -> {
+                                    if (DEBUG) error.printStackTrace();
+                                }
+                        );
+                databaseUpdateReactor.add(stateLoader);
+                return;
+            }
         }
-
         // Good to go...
         initPlayback(queue, repeatMode, playbackSpeed, playbackPitch, playbackSkipSilence,
                 /*playOnInit=*/true);
@@ -615,6 +634,9 @@ public abstract class BasePlayer implements
                 break;
             case Player.STATE_ENDED: // 4
                 changeState(STATE_COMPLETED);
+                if (currentMetadata != null) {
+                    resetPlaybackState(currentMetadata.getMetadata());
+                }
                 isPrepared = false;
                 break;
         }
@@ -721,6 +743,7 @@ public abstract class BasePlayer implements
             case DISCONTINUITY_REASON_SEEK_ADJUSTMENT:
             case DISCONTINUITY_REASON_INTERNAL:
                 if (playQueue.getIndex() != newWindowIndex) {
+                    resetPlaybackState(playQueue.getItem());
                     playQueue.setIndex(newWindowIndex);
                 }
                 break;
@@ -750,6 +773,9 @@ public abstract class BasePlayer implements
     @Override
     public void onSeekProcessed() {
         if (DEBUG) Log.d(TAG, "ExoPlayer - onSeekProcessed() called");
+        if (isPrepared) {
+            savePlaybackState();
+        }
     }
     /*//////////////////////////////////////////////////////////////////////////
     // Playback Listener
@@ -1017,27 +1043,40 @@ public abstract class BasePlayer implements
         }
     }
 
-    protected void savePlaybackState(final StreamInfo info, final long progress) {
+    private void savePlaybackState(final StreamInfo info, final long progress) {
         if (info == null) return;
+        if (DEBUG) Log.d(TAG, "savePlaybackState() called");
         final Disposable stateSaver = recordManager.saveStreamState(info, progress)
                 .observeOn(AndroidSchedulers.mainThread())
+                .doOnError((e) -> {
+                    if (DEBUG) e.printStackTrace();
+                })
                 .onErrorComplete()
-                .subscribe(
+                .subscribe();
-                        ignored -> {/* successful */},
-                        error -> Log.e(TAG, "savePlaybackState() failure: ", error)
-                );
         databaseUpdateReactor.add(stateSaver);
     }
 
-    private void savePlaybackState() {
+    private void resetPlaybackState(final PlayQueueItem queueItem) {
+        if (queueItem == null) return;
+        final Disposable stateSaver = queueItem.getStream()
+                .flatMapCompletable(info -> recordManager.saveStreamState(info, 0))
+                .observeOn(AndroidSchedulers.mainThread())
+                .doOnError((e) -> {
+                    if (DEBUG) e.printStackTrace();
+                })
+                .onErrorComplete()
+                .subscribe();
+        databaseUpdateReactor.add(stateSaver);
+    }
+
+    public void resetPlaybackState(final StreamInfo info) {
+        savePlaybackState(info, 0);
+    }
+
+    public void savePlaybackState() {
         if (simpleExoPlayer == null || currentMetadata == null) return;
         final StreamInfo currentInfo = currentMetadata.getMetadata();
-
+        savePlaybackState(currentInfo, simpleExoPlayer.getCurrentPosition());
-        if (simpleExoPlayer.getCurrentPosition() > RECOVERY_SKIP_THRESHOLD_MILLIS &&
-                simpleExoPlayer.getCurrentPosition() <
-                        simpleExoPlayer.getDuration() - RECOVERY_SKIP_THRESHOLD_MILLIS) {
-            savePlaybackState(currentInfo, simpleExoPlayer.getCurrentPosition());
-        }
     }
 
     private void maybeUpdateCurrentMetadata() {
@@ -1225,4 +1264,10 @@ public abstract class BasePlayer implements
     public boolean gotDestroyed() {
         return simpleExoPlayer == null;
     }
+
+    private boolean isPlaybackResumeEnabled() {
+        final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
+        return prefs.getBoolean(context.getString(R.string.enable_watch_history_key), true)
+                && prefs.getBoolean(context.getString(R.string.enable_playback_resume_key), true);
+    }
 }

app/src/main/java/org/schabi/newpipe/player/MainVideoPlayer.java

@@ -248,6 +248,12 @@ public final class MainVideoPlayer extends AppCompatActivity
         super.attachBaseContext(AudioServiceLeakFix.preventLeakOf(newBase));
     }
 
+    @Override
+    protected void onPause() {
+        playerImpl.savePlaybackState();
+        super.onPause();
+    }
+
     /*//////////////////////////////////////////////////////////////////////////
     // State Saving
     //////////////////////////////////////////////////////////////////////////*/
@@ -583,7 +589,8 @@ public final class MainVideoPlayer extends AppCompatActivity
                     this.getPlaybackSpeed(),
                     this.getPlaybackPitch(),
                     this.getPlaybackSkipSilence(),
-                    this.getPlaybackQuality()
+                    this.getPlaybackQuality(),
+                    false
             );
             context.startService(intent);
 
@@ -605,7 +612,8 @@ public final class MainVideoPlayer extends AppCompatActivity
                     this.getPlaybackSpeed(),
                     this.getPlaybackPitch(),
                     this.getPlaybackSkipSilence(),
-                    this.getPlaybackQuality()
+                    this.getPlaybackQuality(),
+                    false
             );
             context.startService(intent);
 

app/src/main/java/org/schabi/newpipe/player/PopupVideoPlayer.java

@@ -325,6 +325,7 @@ public final class PopupVideoPlayer extends Service {
         isPopupClosing = true;
 
         if (playerImpl != null) {
+            playerImpl.savePlaybackState();
             if (playerImpl.getRootView() != null) {
                 windowManager.removeView(playerImpl.getRootView());
             }
@@ -565,7 +566,8 @@ public final class PopupVideoPlayer extends Service {
                     this.getPlaybackSpeed(),
                     this.getPlaybackPitch(),
                     this.getPlaybackSkipSilence(),
-                    this.getPlaybackQuality()
+                    this.getPlaybackQuality(),
+                    false
             );
             intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
             context.startActivity(intent);

app/src/main/java/org/schabi/newpipe/player/ServicePlayerActivity.java

@@ -188,7 +188,8 @@ public abstract class ServicePlayerActivity extends AppCompatActivity
                 this.player.getPlaybackSpeed(),
                 this.player.getPlaybackPitch(),
                 this.player.getPlaybackSkipSilence(),
-                null
+                null,
+                false
         ).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
     }
 

app/src/main/java/org/schabi/newpipe/player/VideoPlayer.java

@@ -542,6 +542,11 @@ public abstract class VideoPlayer extends BasePlayer
         playbackSpeedTextView.setText(formatSpeed(getPlaybackSpeed()));
 
         super.onPrepared(playWhenReady);
+
+        if (simpleExoPlayer.getCurrentPosition() != 0 && !isControlsVisible()) {
+            controlsVisibilityHandler.removeCallbacksAndMessages(null);
+            controlsVisibilityHandler.postDelayed(this::showControlsThenHide, DEFAULT_CONTROLS_DURATION);
+        }
     }
 
     @Override

app/src/main/java/org/schabi/newpipe/player/playback/MediaSourceManager.java

@@ -158,7 +158,7 @@ public class MediaSourceManager {
      * Dispose the manager and releases all message buses and loaders.
      * */
     public void dispose() {
-        if (DEBUG) Log.d(TAG, "dispose() called.");
+        if (DEBUG) Log.d(TAG, "close() called.");
 
         debouncedSignal.onComplete();
         debouncedLoader.dispose();

app/src/main/java/org/schabi/newpipe/report/UserAction.java

@@ -17,7 +17,9 @@ public enum UserAction {
     REQUESTED_KIOSK("requested kiosk"),
     REQUESTED_COMMENTS("requested comments"),
     DELETE_FROM_HISTORY("delete from history"),
-    PLAY_STREAM("Play stream");
+    PLAY_STREAM("Play stream"),
+    DOWNLOAD_POSTPROCESSING("download post-processing"),
+    DOWNLOAD_FAILED("download failed");
 
 
     private final String message;

app/src/main/java/org/schabi/newpipe/settings/DownloadSettingsFragment.java

@@ -1,30 +1,77 @@
 package org.schabi.newpipe.settings;
 
 import android.app.Activity;
+import android.app.AlertDialog;
+import android.content.ContentResolver;
+import android.content.Context;
 import android.content.Intent;
+import android.net.Uri;
+import android.os.Build;
 import android.os.Bundle;
 import android.support.annotation.Nullable;
+import android.support.annotation.StringRes;
 import android.support.v7.preference.Preference;
 import android.util.Log;
+import android.widget.Toast;
 
 import com.nononsenseapps.filepicker.Utils;
 
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.util.FilePickerActivityHelper;
 
-public class DownloadSettingsFragment extends BasePreferenceFragment {
+import java.io.File;
-    private static final int REQUEST_DOWNLOAD_PATH = 0x1235;
+import java.io.IOException;
-    private static final int REQUEST_DOWNLOAD_AUDIO_PATH = 0x1236;
+import java.io.UnsupportedEncodingException;
+import java.net.URI;
+import java.net.URLDecoder;
+import java.nio.charset.StandardCharsets;
 
-    private String DOWNLOAD_PATH_PREFERENCE;
+import us.shandian.giga.io.StoredDirectoryHelper;
+
+public class DownloadSettingsFragment extends BasePreferenceFragment {
+    private static final int REQUEST_DOWNLOAD_VIDEO_PATH = 0x1235;
+    private static final int REQUEST_DOWNLOAD_AUDIO_PATH = 0x1236;
+    public static final boolean IGNORE_RELEASE_ON_OLD_PATH = true;
+
+    private String DOWNLOAD_PATH_VIDEO_PREFERENCE;
     private String DOWNLOAD_PATH_AUDIO_PREFERENCE;
 
+    private String DOWNLOAD_STORAGE_ASK;
+
+    private Preference prefPathVideo;
+    private Preference prefPathAudio;
+    private Preference prefStorageAsk;
+
+    private Context ctx;
+
     @Override
     public void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
-        initKeys();
+        DOWNLOAD_PATH_VIDEO_PREFERENCE = getString(R.string.download_path_video_key);
+        DOWNLOAD_PATH_AUDIO_PREFERENCE = getString(R.string.download_path_audio_key);
+        DOWNLOAD_STORAGE_ASK = getString(R.string.downloads_storage_ask);
+
+        prefPathVideo = findPreference(DOWNLOAD_PATH_VIDEO_PREFERENCE);
+        prefPathAudio = findPreference(DOWNLOAD_PATH_AUDIO_PREFERENCE);
+        prefStorageAsk = findPreference(DOWNLOAD_STORAGE_ASK);
+
         updatePreferencesSummary();
+        updatePathPickers(!defaultPreferences.getBoolean(DOWNLOAD_STORAGE_ASK, false));
+
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+            prefStorageAsk.setSummary(R.string.downloads_storage_ask_summary);
+        }
+
+        if (hasInvalidPath(DOWNLOAD_PATH_VIDEO_PREFERENCE) || hasInvalidPath(DOWNLOAD_PATH_AUDIO_PREFERENCE)) {
+            Toast.makeText(ctx, R.string.download_pick_path, Toast.LENGTH_SHORT).show();
+            updatePreferencesSummary();
+        }
+
+        prefStorageAsk.setOnPreferenceChangeListener((preference, value) -> {
+            updatePathPickers(!(boolean) value);
+            return true;
+        });
     }
 
     @Override
@@ -32,52 +79,183 @@ public class DownloadSettingsFragment extends BasePreferenceFragment {
         addPreferencesFromResource(R.xml.download_settings);
     }
 
-    private void initKeys() {
+    @Override
-        DOWNLOAD_PATH_PREFERENCE = getString(R.string.download_path_key);
+    public void onAttach(Context context) {
-        DOWNLOAD_PATH_AUDIO_PREFERENCE = getString(R.string.download_path_audio_key);
+        super.onAttach(context);
+        ctx = context;
+    }
+
+    @Override
+    public void onDetach() {
+        super.onDetach();
+        ctx = null;
+        prefStorageAsk.setOnPreferenceChangeListener(null);
     }
 
     private void updatePreferencesSummary() {
-        findPreference(DOWNLOAD_PATH_PREFERENCE).setSummary(defaultPreferences.getString(DOWNLOAD_PATH_PREFERENCE, getString(R.string.download_path_summary)));
+        showPathInSummary(DOWNLOAD_PATH_VIDEO_PREFERENCE, R.string.download_path_summary, prefPathVideo);
-        findPreference(DOWNLOAD_PATH_AUDIO_PREFERENCE).setSummary(defaultPreferences.getString(DOWNLOAD_PATH_AUDIO_PREFERENCE, getString(R.string.download_path_audio_summary)));
+        showPathInSummary(DOWNLOAD_PATH_AUDIO_PREFERENCE, R.string.download_path_audio_summary, prefPathAudio);
+    }
+
+    private void showPathInSummary(String prefKey, @StringRes int defaultString, Preference target) {
+        String rawUri = defaultPreferences.getString(prefKey, null);
+        if (rawUri == null || rawUri.isEmpty()) {
+            target.setSummary(getString(defaultString));
+            return;
+        }
+
+        if (rawUri.charAt(0) == File.separatorChar) {
+            target.setSummary(rawUri);
+            return;
+        }
+        if (rawUri.startsWith(ContentResolver.SCHEME_FILE)) {
+            target.setSummary(new File(URI.create(rawUri)).getPath());
+            return;
+        }
+
+        try {
+            rawUri = URLDecoder.decode(rawUri, StandardCharsets.UTF_8.name());
+        } catch (UnsupportedEncodingException e) {
+            // nothing to do
+        }
+
+        target.setSummary(rawUri);
+    }
+
+    private boolean isFileUri(String path) {
+        return path.charAt(0) == File.separatorChar || path.startsWith(ContentResolver.SCHEME_FILE);
+    }
+
+    private boolean hasInvalidPath(String prefKey) {
+        String value = defaultPreferences.getString(prefKey, null);
+        return value == null || value.isEmpty();
+    }
+
+    private void updatePathPickers(boolean enabled) {
+        prefPathVideo.setEnabled(enabled);
+        prefPathAudio.setEnabled(enabled);
+    }
+
+    // FIXME: after releasing the old path, all downloads created on the folder becomes inaccessible
+    private void forgetSAFTree(Context ctx, String oldPath) {
+        if (IGNORE_RELEASE_ON_OLD_PATH) {
+            return;
+        }
+
+        if (oldPath == null || oldPath.isEmpty() || isFileUri(oldPath)) return;
+
+        try {
+            Uri uri = Uri.parse(oldPath);
+
+            ctx.getContentResolver().releasePersistableUriPermission(uri, StoredDirectoryHelper.PERMISSION_FLAGS);
+            ctx.revokeUriPermission(uri, StoredDirectoryHelper.PERMISSION_FLAGS);
+
+            Log.i(TAG, "Revoke old path permissions success on " + oldPath);
+        } catch (Exception err) {
+            Log.e(TAG, "Error revoking old path permissions on " + oldPath, err);
+        }
+    }
+
+    private void showMessageDialog(@StringRes int title, @StringRes int message) {
+        AlertDialog.Builder msg = new AlertDialog.Builder(ctx);
+        msg.setTitle(title);
+        msg.setMessage(message);
+        msg.setPositiveButton(android.R.string.ok, null);
+        msg.show();
     }
 
     @Override
     public boolean onPreferenceTreeClick(Preference preference) {
         if (DEBUG) {
-             Log.d(TAG, "onPreferenceTreeClick() called with: preference = [" + preference + "]");
+            Log.d(TAG, "onPreferenceTreeClick() called with: preference = [" + preference + "]");
         }
 
-        if (preference.getKey().equals(DOWNLOAD_PATH_PREFERENCE)
+        String key = preference.getKey();
-                || preference.getKey().equals(DOWNLOAD_PATH_AUDIO_PREFERENCE)) {
+        int request;
-            Intent i = new Intent(getActivity(), FilePickerActivityHelper.class)
+
+        if (key.equals(DOWNLOAD_PATH_VIDEO_PREFERENCE)) {
+            request = REQUEST_DOWNLOAD_VIDEO_PATH;
+        } else if (key.equals(DOWNLOAD_PATH_AUDIO_PREFERENCE)) {
+            request = REQUEST_DOWNLOAD_AUDIO_PATH;
+        } else {
+            return super.onPreferenceTreeClick(preference);
+        }
+
+        Intent i;
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+            i = new Intent(Intent.ACTION_OPEN_DOCUMENT_TREE)
+                    .putExtra("android.content.extra.SHOW_ADVANCED", true)
+                    .addFlags(Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION | StoredDirectoryHelper.PERMISSION_FLAGS);
+        } else {
+            i = new Intent(getActivity(), FilePickerActivityHelper.class)
                     .putExtra(FilePickerActivityHelper.EXTRA_ALLOW_MULTIPLE, false)
                     .putExtra(FilePickerActivityHelper.EXTRA_ALLOW_CREATE_DIR, true)
                     .putExtra(FilePickerActivityHelper.EXTRA_MODE, FilePickerActivityHelper.MODE_DIR);
-            if (preference.getKey().equals(DOWNLOAD_PATH_PREFERENCE)) {
-                startActivityForResult(i, REQUEST_DOWNLOAD_PATH);
-            } else if (preference.getKey().equals(DOWNLOAD_PATH_AUDIO_PREFERENCE)) {
-                startActivityForResult(i, REQUEST_DOWNLOAD_AUDIO_PATH);
-            }
         }
 
-        return super.onPreferenceTreeClick(preference);
+        startActivityForResult(i, request);
+
+        return true;
     }
 
     @Override
     public void onActivityResult(int requestCode, int resultCode, Intent data) {
         super.onActivityResult(requestCode, resultCode, data);
         if (DEBUG) {
-            Log.d(TAG, "onActivityResult() called with: requestCode = [" + requestCode + "], resultCode = [" + resultCode + "], data = [" + data + "]");
+            Log.d(TAG, "onActivityResult() called with: requestCode = [" + requestCode + "], " +
+                    "resultCode = [" + resultCode + "], data = [" + data + "]"
+            );
         }
 
-        if ((requestCode == REQUEST_DOWNLOAD_PATH || requestCode == REQUEST_DOWNLOAD_AUDIO_PATH)
+        if (resultCode != Activity.RESULT_OK) return;
-                && resultCode == Activity.RESULT_OK && data.getData() != null) {
-            String key = getString(requestCode == REQUEST_DOWNLOAD_PATH ? R.string.download_path_key : R.string.download_path_audio_key);
-            String path = Utils.getFileForUri(data.getData()).getAbsolutePath();
 
-            defaultPreferences.edit().putString(key, path).apply();
+        String key;
-            updatePreferencesSummary();
+        if (requestCode == REQUEST_DOWNLOAD_VIDEO_PATH)
+            key = DOWNLOAD_PATH_VIDEO_PREFERENCE;
+        else if (requestCode == REQUEST_DOWNLOAD_AUDIO_PATH)
+            key = DOWNLOAD_PATH_AUDIO_PREFERENCE;
+        else
+            return;
+
+        Uri uri = data.getData();
+        if (uri == null) {
+            showMessageDialog(R.string.general_error, R.string.invalid_directory);
+            return;
         }
+
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+            // steps:
+            //       1. revoke permissions on the old save path
+            //       2. acquire permissions on the new save path
+            //       3. save the new path, if step(2) was successful
+            final Context ctx = getContext();
+            if (ctx == null) throw new NullPointerException("getContext()");
+
+            forgetSAFTree(ctx, defaultPreferences.getString(key, ""));
+
+            try {
+                ctx.grantUriPermission(ctx.getPackageName(), uri, StoredDirectoryHelper.PERMISSION_FLAGS);
+
+                StoredDirectoryHelper mainStorage = new StoredDirectoryHelper(ctx, uri, null);
+                Log.i(TAG, "Acquiring tree success from " + uri.toString());
+
+                if (!mainStorage.canWrite())
+                    throw new IOException("No write permissions on " + uri.toString());
+            } catch (IOException err) {
+                Log.e(TAG, "Error acquiring tree from " + uri.toString(), err);
+                showMessageDialog(R.string.general_error, R.string.no_available_dir);
+                return;
+            }
+        } else {
+            File target = Utils.getFileForUri(data.getData());
+            if (!target.canWrite()) {
+                showMessageDialog(R.string.download_to_sdcard_error_title, R.string.download_to_sdcard_error_message);
+                return;
+            }
+            uri = Uri.fromFile(target);
+        }
+
+        defaultPreferences.edit().putString(key, uri.toString()).apply();
+        updatePreferencesSummary();
     }
 }

app/src/main/java/org/schabi/newpipe/settings/NewPipeSettings.java

@@ -70,37 +70,23 @@ public class NewPipeSettings {
         getAudioDownloadFolder(context);
     }
 
-    public static File getVideoDownloadFolder(Context context) {
+    private static void getVideoDownloadFolder(Context context) {
-        return getDir(context, R.string.download_path_key, Environment.DIRECTORY_MOVIES);
+        getDir(context, R.string.download_path_video_key, Environment.DIRECTORY_MOVIES);
     }
 
-    public static String getVideoDownloadPath(Context context) {
+    private static void getAudioDownloadFolder(Context context) {
-        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
+        getDir(context, R.string.download_path_audio_key, Environment.DIRECTORY_MUSIC);
-        final String key = context.getString(R.string.download_path_key);
-        return prefs.getString(key, Environment.DIRECTORY_MOVIES);
     }
 
-    public static File getAudioDownloadFolder(Context context) {
+    private static void getDir(Context context, int keyID, String defaultDirectoryName) {
-        return getDir(context, R.string.download_path_audio_key, Environment.DIRECTORY_MUSIC);
-    }
-
-    public static String getAudioDownloadPath(Context context) {
-        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
-        final String key = context.getString(R.string.download_path_audio_key);
-        return prefs.getString(key, Environment.DIRECTORY_MUSIC);
-    }
-
-    private static File getDir(Context context, int keyID, String defaultDirectoryName) {
         SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
         final String key = context.getString(keyID);
         String downloadPath = prefs.getString(key, null);
-        if ((downloadPath != null) && (!downloadPath.isEmpty())) return new File(downloadPath.trim());
+        if ((downloadPath != null) && (!downloadPath.isEmpty())) return;
 
-        final File dir = getDir(defaultDirectoryName);
         SharedPreferences.Editor spEditor = prefs.edit();
-        spEditor.putString(key, getNewPipeChildFolderPathForDir(dir));
+        spEditor.putString(key, getNewPipeChildFolderPathForDir(getDir(defaultDirectoryName)));
         spEditor.apply();
-        return dir;
     }
 
     @NonNull
@@ -108,19 +94,7 @@ public class NewPipeSettings {
         return new File(Environment.getExternalStorageDirectory(), defaultDirectoryName);
     }
 
-    public static void resetDownloadFolders(Context context) {
-        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
-        resetDownloadFolder(prefs, context.getString(R.string.download_path_audio_key), Environment.DIRECTORY_MUSIC);
-        resetDownloadFolder(prefs, context.getString(R.string.download_path_key), Environment.DIRECTORY_MOVIES);
-    }
-
-    private static void resetDownloadFolder(SharedPreferences prefs, String key, String defaultDirectoryName) {
-        SharedPreferences.Editor spEditor = prefs.edit();
-        spEditor.putString(key, getNewPipeChildFolderPathForDir(getDir(defaultDirectoryName)));
-        spEditor.apply();
-    }
-
     private static String getNewPipeChildFolderPathForDir(File dir) {
-        return new File(dir, "NewPipe").getAbsolutePath();
+        return new File(dir, "NewPipe").toURI().toString();
     }
 }

app/src/main/java/org/schabi/newpipe/streams/DataReader.java

@@ -1,9 +1,10 @@
 package org.schabi.newpipe.streams;
 
+import org.schabi.newpipe.streams.io.SharpStream;
+
 import java.io.EOFException;
 import java.io.IOException;
-
+import java.io.InputStream;
-import org.schabi.newpipe.streams.io.SharpStream;
 
 /**
  * @author kapodamy
@@ -15,89 +16,239 @@ public class DataReader {
     public final static int INTEGER_SIZE = 4;
     public final static int FLOAT_SIZE = 4;
 
-    private long pos;
+    private final static int BUFFER_SIZE = 128 * 1024;// 128 KiB
-    public final SharpStream stream;
+
-    private final boolean rewind;
+    private long position = 0;
+    private final SharpStream stream;
+
+    private InputStream view;
+    private int viewSize;
 
     public DataReader(SharpStream stream) {
-        this.rewind = stream.canRewind();
         this.stream = stream;
-        this.pos = 0L;
+        this.readOffset = this.readBuffer.length;
     }
 
     public long position() {
-        return pos;
+        return position;
     }
 
-    public final int readInt() throws IOException {
+    public int read() throws IOException {
+        if (fillBuffer()) {
+            return -1;
+        }
+
+        position++;
+        readCount--;
+
+        return readBuffer[readOffset++] & 0xFF;
+    }
+
+    public long skipBytes(long amount) throws IOException {
+        if (readCount < 0) {
+            return 0;
+        } else if (readCount == 0) {
+            amount = stream.skip(amount);
+        } else {
+            if (readCount > amount) {
+                readCount -= (int) amount;
+                readOffset += (int) amount;
+            } else {
+                amount = readCount + stream.skip(amount - readCount);
+                readCount = 0;
+                readOffset = readBuffer.length;
+            }
+        }
+
+        position += amount;
+        return amount;
+    }
+
+    public int readInt() throws IOException {
         primitiveRead(INTEGER_SIZE);
         return primitive[0] << 24 | primitive[1] << 16 | primitive[2] << 8 | primitive[3];
     }
 
-    public final int read() throws IOException {
+    public short readShort() throws IOException {
-        int value = stream.read();
+        primitiveRead(SHORT_SIZE);
-        if (value == -1) {
+        return (short) (primitive[0] << 8 | primitive[1]);
-            throw new EOFException();
-        }
-
-        pos++;
-        return value;
     }
 
-    public final long skipBytes(long amount) throws IOException {
+    public long readLong() throws IOException {
-        amount = stream.skip(amount);
-        pos += amount;
-        return amount;
-    }
-
-    public final long readLong() throws IOException {
         primitiveRead(LONG_SIZE);
         long high = primitive[0] << 24 | primitive[1] << 16 | primitive[2] << 8 | primitive[3];
         long low = primitive[4] << 24 | primitive[5] << 16 | primitive[6] << 8 | primitive[7];
         return high << 32 | low;
     }
 
-    public final short readShort() throws IOException {
+    public int read(byte[] buffer) throws IOException {
-        primitiveRead(SHORT_SIZE);
-        return (short) (primitive[0] << 8 | primitive[1]);
-    }
-
-    public final int read(byte[] buffer) throws IOException {
         return read(buffer, 0, buffer.length);
     }
 
-    public final int read(byte[] buffer, int offset, int count) throws IOException {
+    public int read(byte[] buffer, int offset, int count) throws IOException {
-        int res = stream.read(buffer, offset, count);
+        if (readCount < 0) {
-        pos += res;
+            return -1;
+        }
+        int total = 0;
 
-        return res;
+        if (count >= readBuffer.length) {
+            if (readCount > 0) {
+                System.arraycopy(readBuffer, readOffset, buffer, offset, readCount);
+                readOffset += readCount;
+
+                offset += readCount;
+                count -= readCount;
+
+                total = readCount;
+                readCount = 0;
+            }
+            total += Math.max(stream.read(buffer, offset, count), 0);
+        } else {
+            while (count > 0 && !fillBuffer()) {
+                int read = Math.min(readCount, count);
+                System.arraycopy(readBuffer, readOffset, buffer, offset, read);
+
+                readOffset += read;
+                readCount -= read;
+
+                offset += read;
+                count -= read;
+
+                total += read;
+            }
+        }
+
+        position += total;
+        return total;
     }
 
-    public final boolean available() {
+    public boolean available() {
-        return stream.available() > 0;
+        return readCount > 0 || stream.available() > 0;
     }
 
     public void rewind() throws IOException {
         stream.rewind();
-        pos = 0;
+
+        if ((position - viewSize) > 0) {
+            viewSize = 0;// drop view
+        } else {
+            viewSize += position;
+        }
+
+        position = 0;
+        readOffset = readBuffer.length;
     }
 
     public boolean canRewind() {
-        return rewind;
+        return stream.canRewind();
     }
 
-    private short[] primitive = new short[LONG_SIZE];
+    /**
+     * Wraps this instance of {@code DataReader} into {@code InputStream}
+     * object. Note: Any read in the {@code DataReader} will not modify
+     * (decrease) the view size
+     *
+     * @param size the size of the view
+     * @return the view
+     */
+    public InputStream getView(int size) {
+        if (view == null) {
+            view = new InputStream() {
+                @Override
+                public int read() throws IOException {
+                    if (viewSize < 1) {
+                        return -1;
+                    }
+                    int res = DataReader.this.read();
+                    if (res > 0) {
+                        viewSize--;
+                    }
+                    return res;
+                }
+
+                @Override
+                public int read(byte[] buffer) throws IOException {
+                    return read(buffer, 0, buffer.length);
+                }
+
+                @Override
+                public int read(byte[] buffer, int offset, int count) throws IOException {
+                    if (viewSize < 1) {
+                        return -1;
+                    }
+
+                    int res = DataReader.this.read(buffer, offset, Math.min(viewSize, count));
+                    viewSize -= res;
+
+                    return res;
+                }
+
+                @Override
+                public long skip(long amount) throws IOException {
+                    if (viewSize < 1) {
+                        return 0;
+                    }
+                    int res = (int) DataReader.this.skipBytes(Math.min(amount, viewSize));
+                    viewSize -= res;
+
+                    return res;
+                }
+
+                @Override
+                public int available() {
+                    return viewSize;
+                }
+
+                @Override
+                public void close() {
+                    viewSize = 0;
+                }
+
+                @Override
+                public boolean markSupported() {
+                    return false;
+                }
+
+            };
+        }
+        viewSize = size;
+
+        return view;
+    }
+
+    private final short[] primitive = new short[LONG_SIZE];
 
     private void primitiveRead(int amount) throws IOException {
         byte[] buffer = new byte[amount];
-        int read = stream.read(buffer, 0, amount);
+        int read = read(buffer, 0, amount);
-        pos += read;
+
         if (read != amount) {
-            throw new EOFException("Truncated data, missing " + String.valueOf(amount - read) + " bytes");
+            throw new EOFException("Truncated stream, missing " + String.valueOf(amount - read) + " bytes");
         }
 
-        for (int i = 0; i < buffer.length; i++) {
+        for (int i = 0; i < amount; i++) {
-            primitive[i] = (short) (buffer[i] & 0xFF);// the "byte" datatype is signed and is very annoying
+            primitive[i] = (short) (buffer[i] & 0xFF);// the "byte" data type in java is signed and is very annoying
         }
     }
+
+    private final byte[] readBuffer = new byte[BUFFER_SIZE];
+    private int readOffset;
+    private int readCount;
+
+    private boolean fillBuffer() throws IOException {
+        if (readCount < 0) {
+            return true;
+        }
+        if (readOffset >= readBuffer.length) {
+            readCount = stream.read(readBuffer);
+            if (readCount < 1) {
+                readCount = -1;
+                return true;
+            }
+            readOffset = 0;
+        }
+
+        return readCount < 1;
+    }
+
 }

app/src/main/java/org/schabi/newpipe/streams/Mp4DashReader.java

@@ -1,17 +1,15 @@
 package org.schabi.newpipe.streams;
 
+import org.schabi.newpipe.streams.io.SharpStream;
+
 import java.io.EOFException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.UnsupportedEncodingException;
-
 import java.nio.ByteBuffer;
-
 import java.util.ArrayList;
 import java.util.NoSuchElementException;
 
-import org.schabi.newpipe.streams.io.SharpStream;
-
 /**
  * @author kapodamy
  */
@@ -35,14 +33,29 @@ public class Mp4DashReader {
     private static final int ATOM_TREX = 0x74726578;
     private static final int ATOM_TKHD = 0x746B6864;
     private static final int ATOM_MFRA = 0x6D667261;
-    private static final int ATOM_TFRA = 0x74667261;
     private static final int ATOM_MDHD = 0x6D646864;
+    private static final int ATOM_EDTS = 0x65647473;
+    private static final int ATOM_ELST = 0x656C7374;
+    private static final int ATOM_HDLR = 0x68646C72;
+    private static final int ATOM_MINF = 0x6D696E66;
+    private static final int ATOM_DINF = 0x64696E66;
+    private static final int ATOM_STBL = 0x7374626C;
+    private static final int ATOM_STSD = 0x73747364;
+    private static final int ATOM_VMHD = 0x766D6864;
+    private static final int ATOM_SMHD = 0x736D6864;
+
     private static final int BRAND_DASH = 0x64617368;
+    private static final int BRAND_ISO5 = 0x69736F35;
+
+    private static final int HANDLER_VIDE = 0x76696465;
+    private static final int HANDLER_SOUN = 0x736F756E;
+    private static final int HANDLER_SUBT = 0x73756274;
     // </editor-fold>
 
     private final DataReader stream;
 
     private Mp4Track[] tracks = null;
+    private int[] brands = null;
 
     private Box box;
     private Moof moof;
@@ -50,9 +63,10 @@ public class Mp4DashReader {
     private boolean chunkZero = false;
 
     private int selectedTrack = -1;
+    private Box backupBox = null;
 
     public enum TrackKind {
-        Audio, Video, Other
+        Audio, Video, Subtitles, Other
     }
 
     public Mp4DashReader(SharpStream source) {
@@ -65,8 +79,15 @@ public class Mp4DashReader {
         }
 
         box = readBox(ATOM_FTYP);
-        if (parse_ftyp() != BRAND_DASH) {
+        brands = parse_ftyp(box);
-            throw new NoSuchElementException("Main Brand is not dash");
+        switch (brands[0]) {
+            case BRAND_DASH:
+            case BRAND_ISO5:// ¿why not?
+                break;
+            default:
+                throw new NoSuchElementException(
+                        "Not a MPEG-4 DASH container, major brand is not 'dash' or 'iso5' is " + boxName(brands[0])
+                );
         }
 
         Moov moov = null;
@@ -84,8 +105,6 @@ public class Mp4DashReader {
                     break;
                 case ATOM_MFRA:
                     break;
-                case ATOM_MDAT:
-                    throw new IOException("Expected moof, found mdat");
             }
         }
 
@@ -107,15 +126,26 @@ public class Mp4DashReader {
                 }
             }
 
-            if (moov.trak[i].tkhd.bHeight == 0 && moov.trak[i].tkhd.bWidth == 0) {
+            switch (moov.trak[i].mdia.hdlr.subType) {
-                tracks[i].kind = moov.trak[i].tkhd.bVolume == 0 ? TrackKind.Other : TrackKind.Audio;
+                case HANDLER_VIDE:
-            } else {
+                    tracks[i].kind = TrackKind.Video;
-                tracks[i].kind = TrackKind.Video;
+                    break;
+                case HANDLER_SOUN:
+                    tracks[i].kind = TrackKind.Audio;
+                    break;
+                case HANDLER_SUBT:
+                    tracks[i].kind = TrackKind.Subtitles;
+                    break;
+                default:
+                    tracks[i].kind = TrackKind.Other;
+                    break;
             }
         }
+
+        backupBox = box;
     }
 
-    public Mp4Track selectTrack(int index) {
+    Mp4Track selectTrack(int index) {
         selectedTrack = index;
         return tracks[index];
     }
@@ -126,7 +156,7 @@ public class Mp4DashReader {
      * @return list with a basic info
      * @throws IOException if the source stream is not seekeable
      */
-    public int getFragmentsCount() throws IOException {
+    int getFragmentsCount() throws IOException {
         if (selectedTrack < 0) {
             throw new IllegalStateException("track no selected");
         }
@@ -136,7 +166,6 @@ public class Mp4DashReader {
 
         Box tmp;
         int count = 0;
-        long orig_offset = stream.position();
 
         if (box.type == ATOM_MOOF) {
             tmp = box;
@@ -162,17 +191,36 @@ public class Mp4DashReader {
             ensure(tmp);
         } while (stream.available() && (tmp = readBox()) != null);
 
-        stream.rewind();
+        rewind();
-        stream.skipBytes((int) orig_offset);
 
         return count;
     }
 
+    public int[] getBrands() {
+        if (brands == null) throw new IllegalStateException("Not parsed");
+        return brands;
+    }
+
+    public void rewind() throws IOException {
+        if (!stream.canRewind()) {
+            throw new IOException("The provided stream doesn't allow seek");
+        }
+        if (box == null) {
+            return;
+        }
+
+        box = backupBox;
+        chunkZero = false;
+
+        stream.rewind();
+        stream.skipBytes(backupBox.offset + (DataReader.INTEGER_SIZE * 2));
+    }
+
     public Mp4Track[] getAvailableTracks() {
         return tracks;
     }
 
-    public Mp4TrackChunk getNextChunk() throws IOException {
+    public Mp4DashChunk getNextChunk(boolean infoOnly) throws IOException {
         Mp4Track track = tracks[selectedTrack];
 
         while (stream.available()) {
@@ -208,7 +256,7 @@ public class Mp4DashReader {
                             if (hasFlag(moof.traf.tfhd.bFlags, 0x10)) {
                                 moof.traf.trun.chunkSize = moof.traf.tfhd.defaultSampleSize * moof.traf.trun.entryCount;
                             } else {
-                                moof.traf.trun.chunkSize = box.size - 8;
+                                moof.traf.trun.chunkSize = (int) (box.size - 8);
                             }
                         }
                         if (!hasFlag(moof.traf.trun.bFlags, 0x900) && moof.traf.trun.chunkDuration == 0) {
@@ -228,9 +276,12 @@ public class Mp4DashReader {
                         continue;// find another chunk
                     }
 
-                    Mp4TrackChunk chunk = new Mp4TrackChunk();
+                    Mp4DashChunk chunk = new Mp4DashChunk();
                     chunk.moof = moof;
-                    chunk.data = new TrackDataChunk(stream, moof.traf.trun.chunkSize);
+                    if (!infoOnly) {
+                        chunk.data = stream.getView(moof.traf.trun.chunkSize);
+                    }
+
                     moof = null;
 
                     stream.skipBytes(chunk.moof.traf.trun.dataOffset);
@@ -269,6 +320,10 @@ public class Mp4DashReader {
         b.size = stream.readInt();
         b.type = stream.readInt();
 
+        if (b.size == 1) {
+            b.size = stream.readLong();
+        }
+
         return b;
     }
 
@@ -280,6 +335,25 @@ public class Mp4DashReader {
         return b;
     }
 
+    private byte[] readFullBox(Box ref) throws IOException {
+        // full box reading is limited to 2 GiB, and should be enough
+        int size = (int) ref.size;
+
+        ByteBuffer buffer = ByteBuffer.allocate(size);
+        buffer.putInt(size);
+        buffer.putInt(ref.type);
+
+        int read = size - 8;
+
+        if (stream.read(buffer.array(), 8, read) != read) {
+            throw new EOFException(
+                    String.format("EOF reached in box: type=%s offset=%s size=%s", boxName(ref.type), ref.offset, ref.size)
+            );
+        }
+
+        return buffer.array();
+    }
+
     private void ensure(Box ref) throws IOException {
         long skip = ref.offset + ref.size - stream.position();
 
@@ -310,6 +384,14 @@ public class Mp4DashReader {
         return null;
     }
 
+    private Box untilAnyBox(Box ref) throws IOException {
+        if (stream.position() >= (ref.offset + ref.size)) {
+            return null;
+        }
+
+        return readBox();
+    }
+
     // </editor-fold>
 
     // <editor-fold defaultState="collapsed" desc="Box readers">
@@ -329,7 +411,7 @@ public class Mp4DashReader {
                 return obj;
             }
         }
-        
+
         return obj;
     }
 
@@ -397,14 +479,14 @@ public class Mp4DashReader {
 
     private long parse_tfdt() throws IOException {
         int version = stream.read();
-        stream.skipBytes(3);// flags     
+        stream.skipBytes(3);// flags
         return version == 0 ? readUint() : stream.readLong();
     }
 
     private Trun parse_trun() throws IOException {
         Trun obj = new Trun();
         obj.bFlags = stream.readInt();
-        obj.entryCount = stream.readInt();// unsigned int    
+        obj.entryCount = stream.readInt();// unsigned int
 
         obj.entries_rowSize = 0;
         if (hasFlag(obj.bFlags, 0x0100)) {
@@ -448,11 +530,18 @@ public class Mp4DashReader {
         return obj;
     }
 
-    private int parse_ftyp() throws IOException {
+    private int[] parse_ftyp(Box ref) throws IOException {
-        int brand = stream.readInt();
+        int i = 0;
+        int[] list = new int[(int) ((ref.offset + ref.size - stream.position() - 4) / 4)];
+
+        list[i++] = stream.readInt();// major brand
+
         stream.skipBytes(4);// minor version
 
-        return brand;
+        for (; i < list.length; i++)
+            list[i] = stream.readInt();// compatible brands
+
+        return list;
     }
 
     private Mvhd parse_mvhd() throws IOException {
@@ -521,32 +610,66 @@ public class Mp4DashReader {
         trak.tkhd = parse_tkhd();
         ensure(b);
 
-        b = untilBox(ref, ATOM_MDIA);
+        while ((b = untilBox(ref, ATOM_MDIA, ATOM_EDTS)) != null) {
-        trak.mdia = new byte[b.size];
+            switch (b.type) {
+                case ATOM_MDIA:
+                    trak.mdia = parse_mdia(b);
+                    break;
+                case ATOM_EDTS:
+                    trak.edst_elst = parse_edts(b);
+                    break;
+            }
 
-        ByteBuffer buffer = ByteBuffer.wrap(trak.mdia);
+            ensure(b);
-        buffer.putInt(b.size);
+        }
-        buffer.putInt(ATOM_MDIA);
-        stream.read(trak.mdia, 8, b.size - 8);
-
-        trak.mdia_mdhd_timeScale = parse_mdia(buffer);
 
         return trak;
     }
 
-    private int parse_mdia(ByteBuffer data) {
+    private Mdia parse_mdia(Box ref) throws IOException {
-        while (data.hasRemaining()) {
+        Mdia obj = new Mdia();
-            int end = data.position() + data.getInt();
-            if (data.getInt() == ATOM_MDHD) {
-                byte version = data.get();
-                data.position(data.position() + 3 + ((version == 0 ? 4 : 8) * 2));
-                return data.getInt();
-            }
 
-            data.position(end);
+        Box b;
+        while ((b = untilBox(ref, ATOM_MDHD, ATOM_HDLR, ATOM_MINF)) != null) {
+            switch (b.type) {
+                case ATOM_MDHD:
+                    obj.mdhd = readFullBox(b);
+
+                    // read time scale
+                    ByteBuffer buffer = ByteBuffer.wrap(obj.mdhd);
+                    byte version = buffer.get(8);
+                    buffer.position(12 + ((version == 0 ? 4 : 8) * 2));
+                    obj.mdhd_timeScale = buffer.getInt();
+                    break;
+                case ATOM_HDLR:
+                    obj.hdlr = parse_hdlr(b);
+                    break;
+                case ATOM_MINF:
+                    obj.minf = parse_minf(b);
+                    break;
+            }
+            ensure(b);
         }
 
-        return 0;// this NEVER should happen
+        return obj;
+    }
+
+    private Hdlr parse_hdlr(Box ref) throws IOException {
+        // version
+        // flags
+        stream.skipBytes(4);
+
+        Hdlr obj = new Hdlr();
+        obj.bReserved = new byte[12];
+
+        obj.type = stream.readInt();
+        obj.subType = stream.readInt();
+        stream.read(obj.bReserved);
+
+        // component name (is a ansi/ascii string)
+        stream.skipBytes((ref.offset + ref.size) - stream.position());
+
+        return obj;
     }
 
     private Moov parse_moov(Box ref) throws IOException {
@@ -570,7 +693,7 @@ public class Mp4DashReader {
             ensure(b);
         }
 
-        moov.trak = tmp.toArray(new Trak[tmp.size()]);
+        moov.trak = tmp.toArray(new Trak[0]);
 
         return moov;
     }
@@ -584,7 +707,7 @@ public class Mp4DashReader {
             ensure(b);
         }
 
-        return tmp.toArray(new Trex[tmp.size()]);
+        return tmp.toArray(new Trex[0]);
     }
 
     private Trex parse_trex() throws IOException {
@@ -602,74 +725,74 @@ public class Mp4DashReader {
         return obj;
     }
 
-    private Tfra parse_tfra() throws IOException {
+    private Elst parse_edts(Box ref) throws IOException {
-        int version = stream.read();
+        Box b = untilBox(ref, ATOM_ELST);
-
+        if (b == null) {
-        stream.skipBytes(3);// flags
+            return null;
-
-        Tfra tfra = new Tfra();
-        tfra.trackId = stream.readInt();
-
-        stream.skipBytes(3);// reserved
-        int bFlags = stream.read();
-        int size_tts = ((bFlags >> 4) & 3) + ((bFlags >> 2) & 3) + (bFlags & 3);
-
-        tfra.entries_time = new int[stream.readInt()];
-
-        for (int i = 0; i < tfra.entries_time.length; i++) {
-            tfra.entries_time[i] = version == 0 ? stream.readInt() : (int) stream.readLong();
-            stream.skipBytes(size_tts + (version == 0 ? 4 : 8));
         }
 
-        return tfra;
+        Elst obj = new Elst();
-    }
-
-    private Sidx parse_sidx() throws IOException {
-        int version = stream.read();
 
+        boolean v1 = stream.read() == 1;
         stream.skipBytes(3);// flags
 
-        Sidx obj = new Sidx();
+        int entryCount = stream.readInt();
-        obj.referenceId = stream.readInt();
+        if (entryCount < 1) {
-        obj.timescale = stream.readInt();
+            obj.bMediaRate = 0x00010000;// default media rate (1.0)
+            return obj;
+        }
 
-        // earliest presentation entries_time
+        if (v1) {
-        // first offset
+            stream.skipBytes(DataReader.LONG_SIZE);// segment duration
-        // reserved
+            obj.MediaTime = stream.readLong();
-        stream.skipBytes((2 * (version == 0 ? 4 : 8)) + 2);
+            // ignore all remain entries
+            stream.skipBytes((entryCount - 1) * (DataReader.LONG_SIZE * 2));
+        } else {
+            stream.skipBytes(DataReader.INTEGER_SIZE);// segment duration
+            obj.MediaTime = stream.readInt();
+        }
 
-        obj.entries_subsegmentDuration = new int[stream.readShort()];
+        obj.bMediaRate = stream.readInt();
 
-        for (int i = 0; i < obj.entries_subsegmentDuration.length; i++) {
+        return obj;
-            // reference type
+    }
-            // referenced size
-            stream.skipBytes(4);
-            obj.entries_subsegmentDuration[i] = stream.readInt();// unsigned int
 
-            // starts with SAP
+    private Minf parse_minf(Box ref) throws IOException {
-            // SAP type
+        Minf obj = new Minf();
-            // SAP delta entries_time
+
-            stream.skipBytes(4);
+        Box b;
+        while ((b = untilAnyBox(ref)) != null) {
+
+            switch (b.type) {
+                case ATOM_DINF:
+                    obj.dinf = readFullBox(b);
+                    break;
+                case ATOM_STBL:
+                    obj.stbl_stsd = parse_stbl(b);
+                    break;
+                case ATOM_VMHD:
+                case ATOM_SMHD:
+                    obj.$mhd = readFullBox(b);
+                    break;
+
+            }
+            ensure(b);
         }
 
         return obj;
     }
 
-    private Tfra[] parse_mfra(Box ref, int trackCount) throws IOException {
+    /**
-        ArrayList<Tfra> tmp = new ArrayList<>(trackCount);
+     * this only read the "stsd" box inside
-        long limit = ref.offset + ref.size;
+     */
+    private byte[] parse_stbl(Box ref) throws IOException {
+        Box b = untilBox(ref, ATOM_STSD);
 
-        while (stream.position() < limit) {
+        if (b == null) {
-            box = readBox();
+            return new byte[0];// this never should happens (missing codec startup data)
-
-            if (box.type == ATOM_TFRA) {
-                tmp.add(parse_tfra());
-            }
-
-            ensure(box);
         }
 
-        return tmp.toArray(new Tfra[tmp.size()]);
+        return readFullBox(b);
     }
 
     // </editor-fold>
@@ -679,14 +802,7 @@ public class Mp4DashReader {
 
         int type;
         long offset;
-        int size;
+        long size;
-    }
-
-    class Sidx {
-
-        int timescale;
-        int referenceId;
-        int[] entries_subsegmentDuration;
     }
 
     public class Moof {
@@ -711,12 +827,16 @@ public class Mp4DashReader {
         int defaultSampleFlags;
     }
 
-    public class TrunEntry {
+    class TrunEntry {
+
+        int sampleDuration;
+        int sampleSize;
+        int sampleFlags;
+        int sampleCompositionTimeOffset;
+
+        boolean hasCompositionTimeOffset;
+        boolean isKeyframe;
 
-        public int sampleDuration;
-        public int sampleSize;
-        public int sampleFlags;
-        public int sampleCompositionTimeOffset;
     }
 
     public class Trun {
@@ -749,6 +869,31 @@ public class Mp4DashReader {
                 entry.sampleCompositionTimeOffset = buffer.getInt();
             }
 
+            entry.hasCompositionTimeOffset = hasFlag(bFlags, 0x0800);
+            entry.isKeyframe = !hasFlag(entry.sampleFlags, 0x10000);
+
+            return entry;
+        }
+
+        public TrunEntry getAbsoluteEntry(int i, Tfhd header) {
+            TrunEntry entry = getEntry(i);
+
+            if (!hasFlag(bFlags, 0x0100) && hasFlag(header.bFlags, 0x20)) {
+                entry.sampleFlags = header.defaultSampleFlags;
+            }
+
+            if (!hasFlag(bFlags, 0x0200) && hasFlag(header.bFlags, 0x10)) {
+                entry.sampleSize = header.defaultSampleSize;
+            }
+
+            if (!hasFlag(bFlags, 0x0100) && hasFlag(header.bFlags, 0x08)) {
+                entry.sampleDuration = header.defaultSampleDuration;
+            }
+
+            if (i == 0 && hasFlag(bFlags, 0x0004)) {
+                entry.sampleFlags = bFirstSampleFlags;
+            }
+
             return entry;
         }
     }
@@ -768,9 +913,9 @@ public class Mp4DashReader {
     public class Trak {
 
         public Tkhd tkhd;
-        public int mdia_mdhd_timeScale;
+        public Elst edst_elst;
+        public Mdia mdia;
 
-        byte[] mdia;
     }
 
     class Mvhd {
@@ -786,12 +931,6 @@ public class Mp4DashReader {
         Trex[] mvex_trex;
     }
 
-    class Tfra {
-
-        int trackId;
-        int[] entries_time;
-    }
-
     public class Trex {
 
         private int trackId;
@@ -801,6 +940,34 @@ public class Mp4DashReader {
         int defaultSampleFlags;
     }
 
+    public class Elst {
+
+        public long MediaTime;
+        public int bMediaRate;
+    }
+
+    public class Mdia {
+
+        public int mdhd_timeScale;
+        public byte[] mdhd;
+        public Hdlr hdlr;
+        public Minf minf;
+    }
+
+    public class Hdlr {
+
+        public int type;
+        public int subType;
+        public byte[] bReserved;
+    }
+
+    public class Minf {
+
+        public byte[] dinf;
+        public byte[] stbl_stsd;
+        public byte[] $mhd;
+    }
+
     public class Mp4Track {
 
         public TrackKind kind;
@@ -808,10 +975,43 @@ public class Mp4DashReader {
         public Trex trex;
     }
 
-    public class Mp4TrackChunk {
+    public class Mp4DashChunk {
 
         public InputStream data;
         public Moof moof;
+        private int i = 0;
+
+        public TrunEntry getNextSampleInfo() {
+            if (i >= moof.traf.trun.entryCount) {
+                return null;
+            }
+            return moof.traf.trun.getAbsoluteEntry(i++, moof.traf.tfhd);
+        }
+
+        public Mp4DashSample getNextSample() throws IOException {
+            if (data == null) {
+                throw new IllegalStateException("This chunk has info only");
+            }
+            if (i >= moof.traf.trun.entryCount) {
+                return null;
+            }
+
+            Mp4DashSample sample = new Mp4DashSample();
+            sample.info = moof.traf.trun.getAbsoluteEntry(i++, moof.traf.tfhd);
+            sample.data = new byte[sample.info.sampleSize];
+
+            if (data.read(sample.data) != sample.info.sampleSize) {
+                throw new EOFException("EOF reached while reading a sample");
+            }
+
+            return sample;
+        }
+    }
+
+    public class Mp4DashSample {
+
+        public TrunEntry info;
+        public byte[] data;
     }
 //</editor-fold>
 }

app/src/main/java/org/schabi/newpipe/streams/Mp4DashWriter.java

@@ -1,623 +0,0 @@
-package org.schabi.newpipe.streams;
-
-import org.schabi.newpipe.streams.io.SharpStream;
-
-import org.schabi.newpipe.streams.Mp4DashReader.Mp4Track;
-import org.schabi.newpipe.streams.Mp4DashReader.Mp4TrackChunk;
-import org.schabi.newpipe.streams.Mp4DashReader.Trak;
-import org.schabi.newpipe.streams.Mp4DashReader.Trex;
-
-
-import java.io.IOException;
-import java.nio.ByteBuffer;
-import java.util.ArrayList;
-import java.util.List;
-
-import static org.schabi.newpipe.streams.Mp4DashReader.hasFlag;
-
-/**
- *
- * @author kapodamy
- */
-public class Mp4DashWriter {
-
-    private final static byte DIMENSIONAL_FIVE = 5;
-    private final static byte DIMENSIONAL_TWO = 2;
-    private final static short DEFAULT_TIMESCALE = 1000;
-    private final static int BUFFER_SIZE = 8 * 1024;
-    private final static byte DEFAULT_TREX_SIZE = 32;
-    private final static byte[] TFRA_TTS_DEFAULT = new byte[]{0x01, 0x01, 0x01};
-    private final static int EPOCH_OFFSET = 2082844800;
-
-    private Mp4Track[] infoTracks;
-    private SharpStream[] sourceTracks;
-
-    private Mp4DashReader[] readers;
-    private final long time;
-
-    private boolean done = false;
-    private boolean parsed = false;
-
-    private long written = 0;
-    private ArrayList<ArrayList<Integer>> chunkTimes;
-    private ArrayList<Long> moofOffsets;
-    private ArrayList<Integer> fragSizes;
-
-    public Mp4DashWriter(SharpStream... source) {
-        sourceTracks = source;
-        readers = new Mp4DashReader[sourceTracks.length];
-        infoTracks = new Mp4Track[sourceTracks.length];
-        time = (System.currentTimeMillis() / 1000L) + EPOCH_OFFSET;
-    }
-
-    public Mp4Track[] getTracksFromSource(int sourceIndex) throws IllegalStateException {
-        if (!parsed) {
-            throw new IllegalStateException("All sources must be parsed first");
-        }
-
-        return readers[sourceIndex].getAvailableTracks();
-    }
-
-    public void parseSources() throws IOException, IllegalStateException {
-        if (done) {
-            throw new IllegalStateException("already done");
-        }
-        if (parsed) {
-            throw new IllegalStateException("already parsed");
-        }
-
-        try {
-            for (int i = 0; i < readers.length; i++) {
-                readers[i] = new Mp4DashReader(sourceTracks[i]);
-                readers[i].parse();
-            }
-
-        } finally {
-            parsed = true;
-        }
-    }
-
-    public void selectTracks(int... trackIndex) throws IOException {
-        if (done) {
-            throw new IOException("already done");
-        }
-        if (chunkTimes != null) {
-            throw new IOException("tracks already selected");
-        }
-
-        try {
-            chunkTimes = new ArrayList<>(readers.length);
-            moofOffsets = new ArrayList<>(32);
-            fragSizes = new ArrayList<>(32);
-
-            for (int i = 0; i < readers.length; i++) {
-                infoTracks[i] = readers[i].selectTrack(trackIndex[i]);
-
-                chunkTimes.add(new ArrayList<Integer>(32));
-            }
-
-        } finally {
-            parsed = true;
-        }
-    }
-
-    public long getBytesWritten() {
-        return written;
-    }
-
-    public void build(SharpStream out) throws IOException, RuntimeException {
-        if (done) {
-            throw new RuntimeException("already done");
-        }
-        if (!out.canWrite()) {
-            throw new IOException("the provided output is not writable");
-        }
-
-        long sidxOffsets = -1;
-        int maxFrags = 0;
-
-        for (SharpStream stream : sourceTracks) {
-            if (!stream.canRewind()) {
-                sidxOffsets = -2;// sidx not available
-            }
-        }
-
-        try {
-            dump(make_ftyp(), out);
-            dump(make_moov(), out);
-
-            if (sidxOffsets == -1 && out.canRewind()) {
-                //<editor-fold defaultstate="collapsed" desc="calculate sidx">
-                int reserved = 0;
-                for (Mp4DashReader reader : readers) {
-                    int count = reader.getFragmentsCount();
-                    if (count > maxFrags) {
-                        maxFrags = count;
-                    }
-                    reserved += 12 + calcSidxBodySize(count);
-                }
-                if (maxFrags > 0xFFFF) {
-                    sidxOffsets = -3;// TODO: to many fragments, needs a multi-sidx implementation
-                } else {
-                    sidxOffsets = written;
-                    dump(make_free(reserved), out);
-                }
-                //</editor-fold>
-            }
-            ArrayList<Mp4TrackChunk> chunks = new ArrayList<>(readers.length);
-            chunks.add(null);
-
-            int read;
-            byte[] buffer = new byte[BUFFER_SIZE];
-            int sequenceNumber = 1;
-
-            while (true) {
-                chunks.clear();
-
-                for (int i = 0; i < readers.length; i++) {
-                    Mp4TrackChunk chunk = readers[i].getNextChunk();
-                    if (chunk == null || chunk.moof.traf.trun.chunkSize < 1) {
-                        continue;
-                    }
-                    chunk.moof.traf.tfhd.trackId = i + 1;
-                    chunks.add(chunk);
-
-                    if (sequenceNumber == 1) {
-                        if (chunk.moof.traf.trun.entryCount > 0 && hasFlag(chunk.moof.traf.trun.bFlags, 0x0800)) {
-                            chunkTimes.get(i).add(chunk.moof.traf.trun.getEntry(0).sampleCompositionTimeOffset);
-                        } else {
-                            chunkTimes.get(i).add(0);
-                        }
-                    }
-
-                    chunkTimes.get(i).add(chunk.moof.traf.trun.chunkDuration);
-                }
-
-                if (chunks.size() < 1) {
-                    break;
-                }
-
-                long offset = written;
-                moofOffsets.add(offset);
-
-                dump(make_moof(sequenceNumber++, chunks, offset), out);
-                dump(make_mdat(chunks), out);
-
-                for (Mp4TrackChunk chunk : chunks) {
-                    while ((read = chunk.data.read(buffer)) > 0) {
-                        out.write(buffer, 0, read);
-                        written += read;
-                    }
-                }
-
-                fragSizes.add((int) (written - offset));
-            }
-
-            dump(make_mfra(), out);
-
-            if (sidxOffsets > 0 && moofOffsets.size() == maxFrags) {
-                long len = written;
-
-                out.rewind();
-                out.skip(sidxOffsets);
-
-                written = sidxOffsets;
-                sidxOffsets = moofOffsets.get(0);
-
-                for (int i = 0; i < readers.length; i++) {
-                    dump(make_sidx(i, sidxOffsets - written), out);
-                }
-
-                written = len;
-            }
-        } finally {
-            done = true;
-        }
-    }
-
-    public boolean isDone() {
-        return done;
-    }
-
-    public boolean isParsed() {
-        return parsed;
-    }
-
-    public void close() {
-        done = true;
-        parsed = true;
-
-        for (SharpStream src : sourceTracks) {
-            src.dispose();
-        }
-
-        sourceTracks = null;
-        readers = null;
-        infoTracks = null;
-        moofOffsets = null;
-        chunkTimes = null;
-    }
-
-    // <editor-fold defaultstate="collapsed" desc="Utils">
-    private void dump(byte[][] buffer, SharpStream stream) throws IOException {
-        for (byte[] buff : buffer) {
-            stream.write(buff);
-            written += buff.length;
-        }
-    }
-
-    private byte[][] lengthFor(byte[][] buffer) {
-        int length = 0;
-        for (byte[] buff : buffer) {
-            length += buff.length;
-        }
-
-        ByteBuffer.wrap(buffer[0]).putInt(length);
-
-        return buffer;
-    }
-
-    private int calcSidxBodySize(int entryCount) {
-        return 4 + 4 + 8 + 8 + 4 + (entryCount * 12);
-    }
-    // </editor-fold>
-
-    // <editor-fold defaultstate="collapsed" desc="Box makers">
-    private byte[][] make_moof(int sequence, ArrayList<Mp4TrackChunk> chunks, long referenceOffset) {
-        int pos = 2;
-        TrunExtra[] extra = new TrunExtra[chunks.size()];
-
-        byte[][] buffer = new byte[pos + (extra.length * DIMENSIONAL_FIVE)][];
-        buffer[0] = new byte[]{
-            0x00, 0x00, 0x00, 0x00, 0x6D, 0x6F, 0x6F, 0x66,// info header
-            0x00, 0x00, 0x00, 0x10, 0x6D, 0x66, 0x68, 0x64, 0x00, 0x00, 0x00, 0x00//mfhd
-        };
-        buffer[1] = new byte[4];
-        ByteBuffer.wrap(buffer[1]).putInt(sequence);
-
-        for (int i = 0; i < extra.length; i++) {
-            extra[i] = new TrunExtra();
-            for (byte[] buff : make_traf(chunks.get(i), extra[i], referenceOffset)) {
-                buffer[pos++] = buff;
-            }
-        }
-
-        lengthFor(buffer);
-
-        int offset = 8 + ByteBuffer.wrap(buffer[0]).getInt();
-
-        for (int i = 0; i < extra.length; i++) {
-            extra[i].byteBuffer.putInt(offset);
-            offset += chunks.get(i).moof.traf.trun.chunkSize;
-        }
-
-        return buffer;
-    }
-
-    private byte[][] make_traf(Mp4TrackChunk chunk, TrunExtra extra, long moofOffset) {
-        byte[][] buffer = new byte[DIMENSIONAL_FIVE][];
-        buffer[0] = new byte[]{
-            0x00, 0x00, 0x00, 0x00, 0x74, 0x72, 0x61, 0x66,
-            0x00, 0x00, 0x00, 0x00, 0x74, 0x66, 0x68, 0x64
-        };
-
-        int flags = (chunk.moof.traf.tfhd.bFlags & 0x38) | 0x01;
-        byte tfhdBodySize = 8 + 8;
-        if (hasFlag(flags, 0x08)) {
-            tfhdBodySize += 4;
-        }
-        if (hasFlag(flags, 0x10)) {
-            tfhdBodySize += 4;
-        }
-        if (hasFlag(flags, 0x20)) {
-            tfhdBodySize += 4;
-        }
-        buffer[1] = new byte[tfhdBodySize];
-        ByteBuffer set = ByteBuffer.wrap(buffer[1]);
-        set.position(4);
-        set.putInt(chunk.moof.traf.tfhd.trackId);
-        set.putLong(moofOffset);
-        if (hasFlag(flags, 0x08)) {
-            set.putInt(chunk.moof.traf.tfhd.defaultSampleDuration);
-        }
-        if (hasFlag(flags, 0x10)) {
-            set.putInt(chunk.moof.traf.tfhd.defaultSampleSize);
-        }
-        if (hasFlag(flags, 0x20)) {
-            set.putInt(chunk.moof.traf.tfhd.defaultSampleFlags);
-        }
-        set.putInt(0, flags);
-        ByteBuffer.wrap(buffer[0]).putInt(8, 8 + tfhdBodySize);
-
-        buffer[2] = new byte[]{
-            0x00, 0x00, 0x00, 0x14,
-            0x74, 0x66, 0x64, 0x74,
-            0x01, 0x00, 0x00, 0x00,
-            0x00, 0x00, 0x00, 0x00,
-            0x00, 0x00, 0x00, 0x00
-        };
-
-        ByteBuffer.wrap(buffer[2]).putLong(12, chunk.moof.traf.tfdt);
-
-        buffer[3] = new byte[]{
-            0x00, 0x00, 0x00, 0x00, 0x74, 0x72, 0x75, 0x6E,
-            0x00, 0x00, 0x00, 0x00,
-            0x00, 0x00, 0x00, 0x00,
-            0x00, 0x00, 0x00, 0x00
-        };
-
-        buffer[4] = chunk.moof.traf.trun.bEntries;
-
-        lengthFor(buffer);
-
-        set = ByteBuffer.wrap(buffer[3]);
-        set.putInt(buffer[3].length + buffer[4].length);
-        set.position(8);
-        set.putInt((chunk.moof.traf.trun.bFlags | 0x01) & 0x0F01);
-        set.putInt(chunk.moof.traf.trun.entryCount);
-        extra.byteBuffer = set;
-
-        return buffer;
-    }
-
-    private byte[][] make_mdat(ArrayList<Mp4TrackChunk> chunks) {
-        byte[][] buffer = new byte[][]{
-            {
-                0x00, 0x00, 0x00, 0x00, 0x6D, 0x64, 0x61, 0x74
-            }
-        };
-
-        int length = 0;
-
-        for (Mp4TrackChunk chunk : chunks) {
-            length += chunk.moof.traf.trun.chunkSize;
-        }
-
-        ByteBuffer.wrap(buffer[0]).putInt(length + 8);
-
-        return buffer;
-    }
-
-    private byte[][] make_ftyp() {
-        return new byte[][]{
-            {
-                0x00, 0x00, 0x00, 0x20, 0x66, 0x74, 0x79, 0x70, 0x64, 0x61, 0x73, 0x68, 0x00, 0x00, 0x00, 0x00,
-                0x6D, 0x70, 0x34, 0x31, 0x69, 0x73, 0x6F, 0x6D, 0x69, 0x73, 0x6F, 0x36, 0x69, 0x73, 0x6F, 0x32
-            }
-        };
-    }
-
-    private byte[][] make_mvhd() {
-        byte[][] buffer = new byte[DIMENSIONAL_FIVE][];
-
-        buffer[0] = new byte[]{
-            0x00, 0x00, 0x00, 0x78, 0x6D, 0x76, 0x68, 0x64, 0x01, 0x00, 0x00, 0x00
-        };
-        buffer[1] = new byte[28];
-        buffer[2] = new byte[]{
-            0x00, 0x01, 0x00, 0x00, 0x01, 0x00,// default volume and rate
-            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,// reserved values
-            // default matrix
-            0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-            0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-            0x40, 0x00, 0x00, 0x00
-        };
-        buffer[3] = new byte[24];// predefined
-        buffer[4] = ByteBuffer.allocate(4).putInt(infoTracks.length + 1).array();
-
-        long longestTrack = 0;
-
-        for (Mp4Track track : infoTracks) {
-            long tmp = (long) ((track.trak.tkhd.duration / (double) track.trak.mdia_mdhd_timeScale) * DEFAULT_TIMESCALE);
-            if (tmp > longestTrack) {
-                longestTrack = tmp;
-            }
-        }
-
-        ByteBuffer.wrap(buffer[1])
-                .putLong(time)
-                .putLong(time)
-                .putInt(DEFAULT_TIMESCALE)
-                .putLong(longestTrack);
-
-        return buffer;
-    }
-
-    private byte[][] make_trak(int trackId, Trak trak) throws RuntimeException {
-        if (trak.tkhd.matrix.length != 36) {
-            throw new RuntimeException("bad track matrix length (expected 36)");
-        }
-
-        byte[][] buffer = new byte[DIMENSIONAL_FIVE][];
-
-        buffer[0] = new byte[]{
-            0x00, 0x00, 0x00, 0x00, 0x74, 0x72, 0x61, 0x6B,// trak header
-            0x00, 0x00, 0x00, 0x68, 0x74, 0x6B, 0x68, 0x64, 0x01, 0x00, 0x00, 0x03 // tkhd header
-        };
-        buffer[1] = new byte[48];
-        buffer[2] = trak.tkhd.matrix;
-        buffer[3] = new byte[8];
-        buffer[4] = trak.mdia;
-
-        ByteBuffer set = ByteBuffer.wrap(buffer[1]);
-        set.putLong(time);
-        set.putLong(time);
-        set.putInt(trackId);
-        set.position(24);
-        set.putLong(trak.tkhd.duration);
-        set.position(40);
-        set.putShort(trak.tkhd.bLayer);
-        set.putShort(trak.tkhd.bAlternateGroup);
-        set.putShort(trak.tkhd.bVolume);
-
-        ByteBuffer.wrap(buffer[3])
-                .putInt(trak.tkhd.bWidth)
-                .putInt(trak.tkhd.bHeight);
-
-        return lengthFor(buffer);
-    }
-
-    private byte[][] make_moov() throws RuntimeException {
-        int pos = 1;
-        byte[][] buffer = new byte[2 + (DIMENSIONAL_TWO * infoTracks.length) + (DIMENSIONAL_FIVE * infoTracks.length) + DIMENSIONAL_FIVE + 1][];
-
-        buffer[0] = new byte[]{
-            0x00, 0x00, 0x00, 0x00, 0x6D, 0x6F, 0x6F, 0x76
-        };
-
-        for (byte[] buff : make_mvhd()) {
-            buffer[pos++] = buff;
-        }
-
-        for (int i = 0; i < infoTracks.length; i++) {
-            for (byte[] buff : make_trak(i + 1, infoTracks[i].trak)) {
-                buffer[pos++] = buff;
-            }
-        }
-
-        buffer[pos] = new byte[]{
-            0x00, 0x00, 0x00, 0x00, 0x6D, 0x76, 0x65, 0x78
-        };
-
-        ByteBuffer.wrap(buffer[pos++]).putInt((infoTracks.length * DEFAULT_TREX_SIZE) + 8);
-
-        for (int i = 0; i < infoTracks.length; i++) {
-            for (byte[] buff : make_trex(i + 1, infoTracks[i].trex)) {
-                buffer[pos++] = buff;
-            }
-        }
-
-        // default udta
-        buffer[pos] = new byte[]{
-            0x00, 0x00, 0x00, 0x5C, 0x75, 0x64, 0x74, 0x61, 0x00, 0x00, 0x00, 0x54, 0x6D, 0x65, 0x74, 0x61,
-            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x21, 0x68, 0x64, 0x6C, 0x72, 0x00, 0x00, 0x00, 0x00,
-            0x00, 0x00, 0x00, 0x00, 0x6D, 0x64, 0x69, 0x72, 0x61, 0x70, 0x70, 0x6C, 0x00, 0x00, 0x00, 0x00,
-            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x27, 0x69, 0x6C, 0x73, 0x74, 0x00, 0x00, 0x00,
-            0x1F, (byte) 0xA9, 0x63, 0x6D, 0x74, 0x00, 0x00, 0x00, 0x17, 0x64, 0x61, 0x74, 0x61, 0x00, 0x00, 0x00,
-            0x01, 0x00, 0x00, 0x00, 0x00,
-            0x4E, 0x65, 0x77, 0x50, 0x69, 0x70, 0x65// "NewPipe" binary string
-        };
-
-        return lengthFor(buffer);
-    }
-
-    private byte[][] make_trex(int trackId, Trex trex) {
-        byte[][] buffer = new byte[][]{
-            {
-                0x00, 0x00, 0x00, 0x20, 0x74, 0x72, 0x65, 0x78, 0x00, 0x00, 0x00, 0x00
-            },
-            new byte[20]
-        };
-
-        ByteBuffer.wrap(buffer[1])
-                .putInt(trackId)
-                .putInt(trex.defaultSampleDescriptionIndex)
-                .putInt(trex.defaultSampleDuration)
-                .putInt(trex.defaultSampleSize)
-                .putInt(trex.defaultSampleFlags);
-
-        return buffer;
-    }
-
-    private byte[][] make_tfra(int trackId, List<Integer> times, List<Long> moofOffsets) {
-        int entryCount = times.size() - 1;
-        byte[][] buffer = new byte[DIMENSIONAL_TWO][];
-        buffer[0] = new byte[]{
-            0x00, 0x00, 0x00, 0x00, 0x74, 0x66, 0x72, 0x61, 0x01, 0x00, 0x00, 0x00
-        };
-        buffer[1] = new byte[12 + ((16 + TFRA_TTS_DEFAULT.length) * entryCount)];
-
-        ByteBuffer set = ByteBuffer.wrap(buffer[1]);
-        set.putInt(trackId);
-        set.position(8);
-        set.putInt(entryCount);
-
-        long decodeTime = 0;
-
-        for (int i = 0; i < entryCount; i++) {
-            decodeTime += times.get(i);
-            set.putLong(decodeTime);
-            set.putLong(moofOffsets.get(i));
-            set.put(TFRA_TTS_DEFAULT);// default values: traf number/trun number/sample number
-        }
-
-        return lengthFor(buffer);
-    }
-
-    private byte[][] make_mfra() {
-        byte[][] buffer = new byte[2 + (DIMENSIONAL_TWO * infoTracks.length)][];
-        buffer[0] = new byte[]{
-            0x00, 0x00, 0x00, 0x00, 0x6D, 0x66, 0x72, 0x61
-        };
-        int pos = 1;
-
-        for (int i = 0; i < infoTracks.length; i++) {
-            for (byte[] buff : make_tfra(i + 1, chunkTimes.get(i), moofOffsets)) {
-                buffer[pos++] = buff;
-            }
-        }
-
-        buffer[pos] = new byte[]{// mfro
-            0x00, 0x00, 0x00, 0x10, 0x6D, 0x66, 0x72, 0x6F, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
-        };
-
-        lengthFor(buffer);
-
-        ByteBuffer set = ByteBuffer.wrap(buffer[pos]);
-        set.position(12);
-        set.put(buffer[0], 0, 4);
-
-        return buffer;
-
-    }
-
-    private byte[][] make_sidx(int internalTrackId, long firstOffset) {
-        List<Integer> times = chunkTimes.get(internalTrackId);
-        int count = times.size() - 1;// the first item is ignored (composition time)
-
-        if (count > 65535) {
-            throw new OutOfMemoryError("to many fragments. sidx limit is 65535, found " + String.valueOf(count));
-        }
-
-        byte[][] buffer = new byte[][]{
-            new byte[]{
-                0x00, 0x00, 0x00, 0x00, 0x73, 0x69, 0x64, 0x78, 0x01, 0x00, 0x00, 0x00
-            },
-            new byte[calcSidxBodySize(count)]
-        };
-
-        lengthFor(buffer);
-
-        ByteBuffer set = ByteBuffer.wrap(buffer[1]);
-        set.putInt(internalTrackId + 1);
-        set.putInt(infoTracks[internalTrackId].trak.mdia_mdhd_timeScale);
-        set.putLong(0);
-        set.putLong(firstOffset - ByteBuffer.wrap(buffer[0]).getInt());
-        set.putInt(0xFFFF & count);// unsigned
-
-        int i = 0;
-        while (i < count) {
-            set.putInt(fragSizes.get(i) & 0x7fffffff);// default reference type is 0
-            set.putInt(times.get(i + 1));
-            set.putInt(0x90000000);// default SAP settings
-            i++;
-        }
-
-        return buffer;
-    }
-
-    private byte[][] make_free(int totalSize) {
-        return lengthFor(new byte[][]{
-            new byte[]{0x00, 0x00, 0x00, 0x00, 0x66, 0x72, 0x65, 0x65},
-            new byte[totalSize - 8]// this is waste of RAM
-        });
-
-    }
-
-//</editor-fold>
-
-    class TrunExtra {
-
-        ByteBuffer byteBuffer;
-    }
-}

app/src/main/java/org/schabi/newpipe/streams/Mp4FromDashWriter.java

@@ -0,0 +1,810 @@
+package org.schabi.newpipe.streams;
+
+import org.schabi.newpipe.streams.Mp4DashReader.Hdlr;
+import org.schabi.newpipe.streams.Mp4DashReader.Mdia;
+import org.schabi.newpipe.streams.Mp4DashReader.Mp4DashChunk;
+import org.schabi.newpipe.streams.Mp4DashReader.Mp4DashSample;
+import org.schabi.newpipe.streams.Mp4DashReader.Mp4Track;
+import org.schabi.newpipe.streams.Mp4DashReader.TrunEntry;
+import org.schabi.newpipe.streams.io.SharpStream;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+
+/**
+ * @author kapodamy
+ */
+public class Mp4FromDashWriter {
+
+    private final static int EPOCH_OFFSET = 2082844800;
+    private final static short DEFAULT_TIMESCALE = 1000;
+    private final static byte SAMPLES_PER_CHUNK_INIT = 2;
+    private final static byte SAMPLES_PER_CHUNK = 6;// ffmpeg uses 2, basic uses 1 (with 60fps uses 21 or 22). NewPipe will use 6
+    private final static long THRESHOLD_FOR_CO64 = 0xFFFEFFFFL;// near 3.999 GiB
+    private final static int THRESHOLD_MOOV_LENGTH = (256 * 1024) + (2048 * 1024); // 2.2 MiB enough for: 1080p 60fps 00h35m00s
+
+    private final long time;
+
+    private ByteBuffer auxBuffer;
+    private SharpStream outStream;
+
+    private long lastWriteOffset = -1;
+    private long writeOffset;
+
+    private boolean moovSimulation = true;
+
+    private boolean done = false;
+    private boolean parsed = false;
+
+    private Mp4Track[] tracks;
+    private SharpStream[] sourceTracks;
+
+    private Mp4DashReader[] readers;
+    private Mp4DashChunk[] readersChunks;
+
+    private int overrideMainBrand = 0x00;
+
+    public Mp4FromDashWriter(SharpStream... sources) throws IOException {
+        for (SharpStream src : sources) {
+            if (!src.canRewind() && !src.canRead()) {
+                throw new IOException("All sources must be readable and allow rewind");
+            }
+        }
+
+        sourceTracks = sources;
+        readers = new Mp4DashReader[sourceTracks.length];
+        readersChunks = new Mp4DashChunk[readers.length];
+        time = (System.currentTimeMillis() / 1000L) + EPOCH_OFFSET;
+    }
+
+    public Mp4Track[] getTracksFromSource(int sourceIndex) throws IllegalStateException {
+        if (!parsed) {
+            throw new IllegalStateException("All sources must be parsed first");
+        }
+
+        return readers[sourceIndex].getAvailableTracks();
+    }
+
+    public void parseSources() throws IOException, IllegalStateException {
+        if (done) {
+            throw new IllegalStateException("already done");
+        }
+        if (parsed) {
+            throw new IllegalStateException("already parsed");
+        }
+
+        try {
+            for (int i = 0; i < readers.length; i++) {
+                readers[i] = new Mp4DashReader(sourceTracks[i]);
+                readers[i].parse();
+            }
+
+        } finally {
+            parsed = true;
+        }
+    }
+
+    public void selectTracks(int... trackIndex) throws IOException {
+        if (done) {
+            throw new IOException("already done");
+        }
+        if (tracks != null) {
+            throw new IOException("tracks already selected");
+        }
+
+        try {
+            tracks = new Mp4Track[readers.length];
+            for (int i = 0; i < readers.length; i++) {
+                tracks[i] = readers[i].selectTrack(trackIndex[i]);
+            }
+        } finally {
+            parsed = true;
+        }
+    }
+
+    public void setMainBrand(int brandId) {
+        overrideMainBrand = brandId;
+    }
+
+    public boolean isDone() {
+        return done;
+    }
+
+    public boolean isParsed() {
+        return parsed;
+    }
+
+    public void close() throws IOException {
+        done = true;
+        parsed = true;
+
+        for (SharpStream src : sourceTracks) {
+            src.close();
+        }
+
+        tracks = null;
+        sourceTracks = null;
+
+        readers = null;
+        readersChunks = null;
+
+        auxBuffer = null;
+        outStream = null;
+    }
+
+    public void build(SharpStream output) throws IOException {
+        if (done) {
+            throw new RuntimeException("already done");
+        }
+        if (!output.canWrite()) {
+            throw new IOException("the provided output is not writable");
+        }
+
+        //
+        // WARNING: the muxer requires at least 8 samples of every track
+        //          not allowed for very short tracks (less than 0.5 seconds)
+        //
+        outStream = output;
+        int read = 8;// mdat box header size
+        long totalSampleSize = 0;
+        int[] sampleExtra = new int[readers.length];
+        int[] defaultMediaTime = new int[readers.length];
+        int[] defaultSampleDuration = new int[readers.length];
+        int[] sampleCount = new int[readers.length];
+
+        TablesInfo[] tablesInfo = new TablesInfo[tracks.length];
+        for (int i = 0; i < tablesInfo.length; i++) {
+            tablesInfo[i] = new TablesInfo();
+        }
+
+        //<editor-fold defaultstate="expanded" desc="calculate stbl sample tables size and required moov values">
+        for (int i = 0; i < readers.length; i++) {
+            int samplesSize = 0;
+            int sampleSizeChanges = 0;
+            int compositionOffsetLast = -1;
+
+            Mp4DashChunk chunk;
+            while ((chunk = readers[i].getNextChunk(true)) != null) {
+
+                if (defaultMediaTime[i] < 1 && chunk.moof.traf.tfhd.defaultSampleDuration > 0) {
+                    defaultMediaTime[i] = chunk.moof.traf.tfhd.defaultSampleDuration;
+                }
+
+                read += chunk.moof.traf.trun.chunkSize;
+                sampleExtra[i] += chunk.moof.traf.trun.chunkDuration;// calculate track duration
+
+                TrunEntry info;
+                while ((info = chunk.getNextSampleInfo()) != null) {
+                    if (info.isKeyframe) {
+                        tablesInfo[i].stss++;
+                    }
+
+                    if (info.sampleDuration > defaultSampleDuration[i]) {
+                        defaultSampleDuration[i] = info.sampleDuration;
+                    }
+
+                    tablesInfo[i].stsz++;
+                    if (samplesSize != info.sampleSize) {
+                        samplesSize = info.sampleSize;
+                        sampleSizeChanges++;
+                    }
+
+                    if (info.hasCompositionTimeOffset) {
+                        if (info.sampleCompositionTimeOffset != compositionOffsetLast) {
+                            tablesInfo[i].ctts++;
+                            compositionOffsetLast = info.sampleCompositionTimeOffset;
+                        }
+                    }
+
+                    totalSampleSize += info.sampleSize;
+                }
+            }
+
+            if (defaultMediaTime[i] < 1) {
+                defaultMediaTime[i] = defaultSampleDuration[i];
+            }
+
+            readers[i].rewind();
+
+            int tmp = tablesInfo[i].stsz - SAMPLES_PER_CHUNK_INIT;
+            tablesInfo[i].stco = (tmp / SAMPLES_PER_CHUNK) + 1;// +1 for samples in first chunk
+
+            tmp = tmp % SAMPLES_PER_CHUNK;
+            if (tmp == 0) {
+                tablesInfo[i].stsc = 2;// first chunk (init) and succesive chunks
+                tablesInfo[i].stsc_bEntries = new int[]{
+                        1, SAMPLES_PER_CHUNK_INIT, 1,
+                        2, SAMPLES_PER_CHUNK, 1
+                };
+            } else {
+                tablesInfo[i].stsc = 3;// first chunk (init) and succesive chunks and remain chunk
+                tablesInfo[i].stsc_bEntries = new int[]{
+                        1, SAMPLES_PER_CHUNK_INIT, 1,
+                        2, SAMPLES_PER_CHUNK, 1,
+                        tablesInfo[i].stco + 1, tmp, 1
+                };
+                tablesInfo[i].stco++;
+            }
+
+            sampleCount[i] = tablesInfo[i].stsz;
+
+            if (sampleSizeChanges == 1) {
+                tablesInfo[i].stsz = 0;
+                tablesInfo[i].stsz_default = samplesSize;
+            } else {
+                tablesInfo[i].stsz_default = 0;
+            }
+
+            if (tablesInfo[i].stss == tablesInfo[i].stsz) {
+                tablesInfo[i].stss = -1;// for audio tracks (all samples are keyframes)
+            }
+
+            // ensure track duration
+            if (tracks[i].trak.tkhd.duration < 1) {
+                tracks[i].trak.tkhd.duration = sampleExtra[i];// this never should happen
+            }
+        }
+        //</editor-fold>
+
+        boolean is64 = read > THRESHOLD_FOR_CO64;
+
+        // calculate the moov size;
+        int auxSize = make_moov(defaultMediaTime, tablesInfo, is64);
+
+        if (auxSize < THRESHOLD_MOOV_LENGTH) {
+            auxBuffer = ByteBuffer.allocate(auxSize);// cache moov in the memory
+        }
+
+        moovSimulation = false;
+        writeOffset = 0;
+
+        final int ftyp_size = make_ftyp();
+
+        // reserve moov space in the output stream
+        /*if (outStream.canSetLength()) {
+            long length = writeOffset + auxSize;
+            outStream.setLength(length);
+            outSeek(length);
+        } else {*/
+        if (auxSize > 0) {
+            int length = auxSize;
+            byte[] buffer = new byte[8 * 1024];// 8 KiB
+            while (length > 0) {
+                int count = Math.min(length, buffer.length);
+                outWrite(buffer, 0, count);
+                length -= count;
+            }
+        }
+
+        if (auxBuffer == null) {
+            outSeek(ftyp_size);
+        }
+
+        // tablesInfo contais row counts
+        // and after returning from make_moov() will contain table offsets
+        make_moov(defaultMediaTime, tablesInfo, is64);
+
+        // write tables: stts stsc
+        // reset for ctts table: sampleCount sampleExtra
+        for (int i = 0; i < readers.length; i++) {
+            writeEntryArray(tablesInfo[i].stts, 2, sampleCount[i], defaultSampleDuration[i]);
+            writeEntryArray(tablesInfo[i].stsc, tablesInfo[i].stsc_bEntries.length, tablesInfo[i].stsc_bEntries);
+            tablesInfo[i].stsc_bEntries = null;
+            if (tablesInfo[i].ctts > 0) {
+                sampleCount[i] = 1;// index is not base zero
+                sampleExtra[i] = -1;
+            }
+        }
+
+        if (auxBuffer == null) {
+            outRestore();
+        }
+
+        outWrite(make_mdat(totalSampleSize, is64));
+
+        int[] sampleIndex = new int[readers.length];
+        int[] sizes = new int[SAMPLES_PER_CHUNK];
+        int[] sync = new int[SAMPLES_PER_CHUNK];
+
+        int written = readers.length;
+        while (written > 0) {
+            written = 0;
+
+            for (int i = 0; i < readers.length; i++) {
+                if (sampleIndex[i] < 0) {
+                    continue;// track is done
+                }
+
+                long chunkOffset = writeOffset;
+                int syncCount = 0;
+                int limit = sampleIndex[i] == 0 ? SAMPLES_PER_CHUNK_INIT : SAMPLES_PER_CHUNK;
+
+                int j = 0;
+                for (; j < limit; j++) {
+                    Mp4DashSample sample = getNextSample(i);
+
+                    if (sample == null) {
+                        if (tablesInfo[i].ctts > 0 && sampleExtra[i] >= 0) {
+                            writeEntryArray(tablesInfo[i].ctts, 1, sampleCount[i], sampleExtra[i]);// flush last entries
+                        }
+                        sampleIndex[i] = -1;
+                        break;
+                    }
+
+                    sampleIndex[i]++;
+
+                    if (tablesInfo[i].ctts > 0) {
+                        if (sample.info.sampleCompositionTimeOffset == sampleExtra[i]) {
+                            sampleCount[i]++;
+                        } else {
+                            if (sampleExtra[i] >= 0) {
+                                tablesInfo[i].ctts = writeEntryArray(tablesInfo[i].ctts, 2, sampleCount[i], sampleExtra[i]);
+                                outRestore();
+                            }
+                            sampleCount[i] = 1;
+                            sampleExtra[i] = sample.info.sampleCompositionTimeOffset;
+                        }
+                    }
+
+                    if (tablesInfo[i].stss > 0 && sample.info.isKeyframe) {
+                        sync[syncCount++] = sampleIndex[i];
+                    }
+
+                    if (tablesInfo[i].stsz > 0) {
+                        sizes[j] = sample.data.length;
+                    }
+
+                    outWrite(sample.data, 0, sample.data.length);
+                }
+
+                if (j > 0) {
+                    written++;
+
+                    if (tablesInfo[i].stsz > 0) {
+                        tablesInfo[i].stsz = writeEntryArray(tablesInfo[i].stsz, j, sizes);
+                    }
+
+                    if (syncCount > 0) {
+                        tablesInfo[i].stss = writeEntryArray(tablesInfo[i].stss, syncCount, sync);
+                    }
+
+                    if (is64) {
+                        tablesInfo[i].stco = writeEntry64(tablesInfo[i].stco, chunkOffset);
+                    } else {
+                        tablesInfo[i].stco = writeEntryArray(tablesInfo[i].stco, 1, (int) chunkOffset);
+                    }
+
+                    outRestore();
+                }
+            }
+        }
+
+        if (auxBuffer != null) {
+            // dump moov
+            outSeek(ftyp_size);
+            outStream.write(auxBuffer.array(), 0, auxBuffer.capacity());
+            auxBuffer = null;
+        }
+    }
+
+    private Mp4DashSample getNextSample(int track) throws IOException {
+        if (readersChunks[track] == null) {
+            readersChunks[track] = readers[track].getNextChunk(false);
+            if (readersChunks[track] == null) {
+                return null;// EOF reached
+            }
+        }
+
+        Mp4DashSample sample = readersChunks[track].getNextSample();
+        if (sample == null) {
+            readersChunks[track] = null;
+            return getNextSample(track);
+        } else {
+            return sample;
+        }
+    }
+
+    // <editor-fold defaultstate="expanded" desc="Stbl handling">
+    private int writeEntry64(int offset, long value) throws IOException {
+        outBackup();
+
+        auxSeek(offset);
+        auxWrite(ByteBuffer.allocate(8).putLong(value).array());
+
+        return offset + 8;
+    }
+
+    private int writeEntryArray(int offset, int count, int... values) throws IOException {
+        outBackup();
+
+        auxSeek(offset);
+
+        int size = count * 4;
+        ByteBuffer buffer = ByteBuffer.allocate(size);
+
+        for (int i = 0; i < count; i++) {
+            buffer.putInt(values[i]);
+        }
+
+        auxWrite(buffer.array());
+
+        return offset + size;
+    }
+
+    private void outBackup() {
+        if (auxBuffer == null && lastWriteOffset < 0) {
+            lastWriteOffset = writeOffset;
+        }
+    }
+
+    /**
+     * Restore to the previous position before the first call to writeEntry64()
+     * or writeEntryArray() methods.
+     */
+    private void outRestore() throws IOException {
+        if (lastWriteOffset > 0) {
+            outSeek(lastWriteOffset);
+            lastWriteOffset = -1;
+        }
+    }
+    // </editor-fold>
+
+    // <editor-fold defaultstate="expanded" desc="Utils">
+    private void outWrite(byte[] buffer) throws IOException {
+        outWrite(buffer, 0, buffer.length);
+    }
+
+    private void outWrite(byte[] buffer, int offset, int count) throws IOException {
+        writeOffset += count;
+        outStream.write(buffer, offset, count);
+    }
+
+    private void outSeek(long offset) throws IOException {
+        if (outStream.canSeek()) {
+            outStream.seek(offset);
+            writeOffset = offset;
+        } else if (outStream.canRewind()) {
+            outStream.rewind();
+            writeOffset = 0;
+            outSkip(offset);
+        } else {
+            throw new IOException("cannot seek or rewind the output stream");
+        }
+    }
+
+    private void outSkip(long amount) throws IOException {
+        outStream.skip(amount);
+        writeOffset += amount;
+    }
+
+    private int lengthFor(int offset) throws IOException {
+        int size = auxOffset() - offset;
+
+        if (moovSimulation) {
+            return size;
+        }
+
+        auxSeek(offset);
+        auxWrite(size);
+        auxSkip(size - 4);
+
+        return size;
+    }
+
+    private int make(int type, int extra, int columns, int rows) throws IOException {
+        final byte base = 16;
+        int size = columns * rows * 4;
+        int total = size + base;
+        int offset = auxOffset();
+
+        if (extra >= 0) {
+            total += 4;
+        }
+
+        auxWrite(ByteBuffer.allocate(12)
+                .putInt(total)
+                .putInt(type)
+                .putInt(0x00)// default version & flags
+                .array()
+        );
+
+        if (extra >= 0) {
+            //size += 4;// commented for auxiliar buffer !!!
+            offset += 4;
+            auxWrite(extra);
+        }
+
+        auxWrite(rows);
+        auxSkip(size);
+
+        return offset + base;
+    }
+
+    private void auxWrite(int value) throws IOException {
+        auxWrite(ByteBuffer.allocate(4)
+                .putInt(value)
+                .array()
+        );
+    }
+
+    private void auxWrite(byte[] buffer) throws IOException {
+        if (moovSimulation) {
+            writeOffset += buffer.length;
+        } else if (auxBuffer == null) {
+            outWrite(buffer, 0, buffer.length);
+        } else {
+            auxBuffer.put(buffer);
+        }
+    }
+
+    private void auxSeek(int offset) throws IOException {
+        if (moovSimulation) {
+            writeOffset = offset;
+        } else if (auxBuffer == null) {
+            outSeek(offset);
+        } else {
+            auxBuffer.position(offset);
+        }
+    }
+
+    private void auxSkip(int amount) throws IOException {
+        if (moovSimulation) {
+            writeOffset += amount;
+        } else if (auxBuffer == null) {
+            outSkip(amount);
+        } else {
+            auxBuffer.position(auxBuffer.position() + amount);
+        }
+    }
+
+    private int auxOffset() {
+        return auxBuffer == null ? (int) writeOffset : auxBuffer.position();
+    }
+    // </editor-fold>
+
+    // <editor-fold defaultstate="expanded" desc="Box makers">
+    private int make_ftyp() throws IOException {
+        byte[] buffer = new byte[]{
+                0x00, 0x00, 0x00, 0x1C, 0x66, 0x74, 0x79, 0x70,// ftyp
+                0x6D, 0x70, 0x34, 0x32,// mayor brand (mp42)
+                0x00, 0x00, 0x02, 0x00,// default minor version (512)
+                0x6D, 0x70, 0x34, 0x31, 0x69, 0x73, 0x6F, 0x6D, 0x69, 0x73, 0x6F, 0x32// compatible brands: mp41 isom iso2
+        };
+
+        if (overrideMainBrand != 0)
+            ByteBuffer.wrap(buffer).putInt(8, overrideMainBrand);
+
+        outWrite(buffer);
+
+        return buffer.length;
+    }
+
+    private byte[] make_mdat(long refSize, boolean is64) {
+        if (is64) {
+            refSize += 16;
+        } else {
+            refSize += 8;
+        }
+
+        ByteBuffer buffer = ByteBuffer.allocate(is64 ? 16 : 8)
+                .putInt(is64 ? 0x01 : (int) refSize)
+                .putInt(0x6D646174);// mdat
+
+        if (is64) {
+            buffer.putLong(refSize);
+        }
+
+        return buffer.array();
+    }
+
+    private void make_mvhd(long longestTrack) throws IOException {
+        auxWrite(new byte[]{
+                0x00, 0x00, 0x00, 0x78, 0x6D, 0x76, 0x68, 0x64, 0x01, 0x00, 0x00, 0x00
+        });
+        auxWrite(ByteBuffer.allocate(28)
+                .putLong(time)
+                .putLong(time)
+                .putInt(DEFAULT_TIMESCALE)
+                .putLong(longestTrack)
+                .array()
+        );
+
+        auxWrite(new byte[]{
+                0x00, 0x01, 0x00, 0x00, 0x01, 0x00,// default volume and rate
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,// reserved values
+                // default matrix
+                0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                0x40, 0x00, 0x00, 0x00
+        });
+        auxWrite(new byte[24]);// predefined
+        auxWrite(ByteBuffer.allocate(4)
+                .putInt(tracks.length + 1)
+                .array()
+        );
+    }
+
+    private int make_moov(int[] defaultMediaTime, TablesInfo[] tablesInfo, boolean is64) throws RuntimeException, IOException {
+        int start = auxOffset();
+
+        auxWrite(new byte[]{
+                0x00, 0x00, 0x00, 0x00, 0x6D, 0x6F, 0x6F, 0x76
+        });
+
+        long longestTrack = 0;
+        long[] durations = new long[tracks.length];
+
+        for (int i = 0; i < durations.length; i++) {
+            durations[i] = (long) Math.ceil(
+                    ((double) tracks[i].trak.tkhd.duration / tracks[i].trak.mdia.mdhd_timeScale) * DEFAULT_TIMESCALE
+            );
+
+            if (durations[i] > longestTrack) {
+                longestTrack = durations[i];
+            }
+        }
+
+        make_mvhd(longestTrack);
+
+        for (int i = 0; i < tracks.length; i++) {
+            if (tracks[i].trak.tkhd.matrix.length != 36) {
+                throw new RuntimeException("bad track matrix length (expected 36) in track n°" + i);
+            }
+            make_trak(i, durations[i], defaultMediaTime[i], tablesInfo[i], is64);
+        }
+
+        // udta/meta/ilst/©too
+        auxWrite(new byte[]{
+                0x00, 0x00, 0x00, 0x5C, 0x75, 0x64, 0x74, 0x61, 0x00, 0x00, 0x00, 0x54, 0x6D, 0x65, 0x74, 0x61,
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x21, 0x68, 0x64, 0x6C, 0x72, 0x00, 0x00, 0x00, 0x00,
+                0x00, 0x00, 0x00, 0x00, 0x6D, 0x64, 0x69, 0x72, 0x61, 0x70, 0x70, 0x6C, 0x00, 0x00, 0x00, 0x00,
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x27, 0x69, 0x6C, 0x73, 0x74, 0x00, 0x00, 0x00,
+                0x1F, (byte) 0xA9, 0x74, 0x6F, 0x6F, 0x00, 0x00, 0x00, 0x17, 0x64, 0x61, 0x74, 0x61, 0x00, 0x00,
+                0x00, 0x01, 0x00, 0x00, 0x00, 0x00,
+                0x4E, 0x65, 0x77, 0x50, 0x69, 0x70, 0x65// "NewPipe" binary string
+        });
+
+        return lengthFor(start);
+    }
+
+    private void make_trak(int index, long duration, int defaultMediaTime, TablesInfo tables, boolean is64) throws IOException {
+        int start = auxOffset();
+
+        auxWrite(new byte[]{
+                0x00, 0x00, 0x00, 0x00, 0x74, 0x72, 0x61, 0x6B,// trak header
+                0x00, 0x00, 0x00, 0x68, 0x74, 0x6B, 0x68, 0x64, 0x01, 0x00, 0x00, 0x03 // tkhd header
+        });
+
+        ByteBuffer buffer = ByteBuffer.allocate(48);
+        buffer.putLong(time);
+        buffer.putLong(time);
+        buffer.putInt(index + 1);
+        buffer.position(24);
+        buffer.putLong(duration);
+        buffer.position(40);
+        buffer.putShort(tracks[index].trak.tkhd.bLayer);
+        buffer.putShort(tracks[index].trak.tkhd.bAlternateGroup);
+        buffer.putShort(tracks[index].trak.tkhd.bVolume);
+        auxWrite(buffer.array());
+
+        auxWrite(tracks[index].trak.tkhd.matrix);
+        auxWrite(ByteBuffer.allocate(8)
+                .putInt(tracks[index].trak.tkhd.bWidth)
+                .putInt(tracks[index].trak.tkhd.bHeight)
+                .array()
+        );
+
+        auxWrite(new byte[]{
+                0x00, 0x00, 0x00, 0x24, 0x65, 0x64, 0x74, 0x73,// edts header
+                0x00, 0x00, 0x00, 0x1C, 0x65, 0x6C, 0x73, 0x74, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01// elst header
+        });
+
+        int bMediaRate;
+        int mediaTime;
+
+        if (tracks[index].trak.edst_elst == null) {
+            // is a audio track ¿is edst/elst opcional for audio tracks?
+            mediaTime = 0x00;// ffmpeg set this value as zero, instead of defaultMediaTime
+            bMediaRate = 0x00010000;
+        } else {
+            mediaTime = (int) tracks[index].trak.edst_elst.MediaTime;
+            bMediaRate = tracks[index].trak.edst_elst.bMediaRate;
+        }
+
+        auxWrite(ByteBuffer
+                .allocate(12)
+                .putInt((int) duration)
+                .putInt(mediaTime)
+                .putInt(bMediaRate)
+                .array()
+        );
+
+        make_mdia(tracks[index].trak.mdia, tables, is64);
+
+        lengthFor(start);
+    }
+
+    private void make_mdia(Mdia mdia, TablesInfo tablesInfo, boolean is64) throws IOException {
+
+        int start_mdia = auxOffset();
+        auxWrite(new byte[]{0x00, 0x00, 0x00, 0x00, 0x6D, 0x64, 0x69, 0x61});// mdia
+        auxWrite(mdia.mdhd);
+        auxWrite(make_hdlr(mdia.hdlr));
+
+        int start_minf = auxOffset();
+        auxWrite(new byte[]{0x00, 0x00, 0x00, 0x00, 0x6D, 0x69, 0x6E, 0x66});// minf
+        auxWrite(mdia.minf.$mhd);
+        auxWrite(mdia.minf.dinf);
+
+        int start_stbl = auxOffset();
+        auxWrite(new byte[]{0x00, 0x00, 0x00, 0x00, 0x73, 0x74, 0x62, 0x6C});// stbl
+        auxWrite(mdia.minf.stbl_stsd);
+
+        //
+        // In audio tracks the following tables is not required: ssts ctts
+        // And stsz can be empty if has a default sample size
+        //
+        if (moovSimulation) {
+            make(0x73747473, -1, 2, 1);
+            if (tablesInfo.stss > 0) {
+                make(0x73747373, -1, 1, tablesInfo.stss);
+            }
+            if (tablesInfo.ctts > 0) {
+                make(0x63747473, -1, 2, tablesInfo.ctts);
+            }
+            make(0x73747363, -1, 3, tablesInfo.stsc);
+            make(0x7374737A, tablesInfo.stsz_default, 1, tablesInfo.stsz);
+            make(is64 ? 0x636F3634 : 0x7374636F, -1, is64 ? 2 : 1, tablesInfo.stco);
+        } else {
+            tablesInfo.stts = make(0x73747473, -1, 2, 1);
+            if (tablesInfo.stss > 0) {
+                tablesInfo.stss = make(0x73747373, -1, 1, tablesInfo.stss);
+            }
+            if (tablesInfo.ctts > 0) {
+                tablesInfo.ctts = make(0x63747473, -1, 2, tablesInfo.ctts);
+            }
+            tablesInfo.stsc = make(0x73747363, -1, 3, tablesInfo.stsc);
+            tablesInfo.stsz = make(0x7374737A, tablesInfo.stsz_default, 1, tablesInfo.stsz);
+            tablesInfo.stco = make(is64 ? 0x636F3634 : 0x7374636F, -1, is64 ? 2 : 1, tablesInfo.stco);
+        }
+
+        lengthFor(start_stbl);
+        lengthFor(start_minf);
+        lengthFor(start_mdia);
+    }
+
+    private byte[] make_hdlr(Hdlr hdlr) {
+        ByteBuffer buffer = ByteBuffer.wrap(new byte[]{
+                0x00, 0x00, 0x00, 0x77, 0x68, 0x64, 0x6C, 0x72,// hdlr
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                // binary string "ISO Media file created in NewPipe (A libre lightweight streaming frontend for Android)."
+                0x49, 0x53, 0x4F, 0x20, 0x4D, 0x65, 0x64, 0x69, 0x61, 0x20, 0x66, 0x69, 0x6C, 0x65, 0x20, 0x63,
+                0x72, 0x65, 0x61, 0x74, 0x65, 0x64, 0x20, 0x69, 0x6E, 0x20, 0x4E, 0x65, 0x77, 0x50, 0x69, 0x70,
+                0x65, 0x20, 0x28, 0x41, 0x20, 0x6C, 0x69, 0x62, 0x72, 0x65, 0x20, 0x6C, 0x69, 0x67, 0x68, 0x74,
+                0x77, 0x65, 0x69, 0x67, 0x68, 0x74, 0x20, 0x73, 0x74, 0x72, 0x65, 0x61, 0x6D, 0x69, 0x6E, 0x67,
+                0x20, 0x66, 0x72, 0x6F, 0x6E, 0x74, 0x65, 0x6E, 0x64, 0x20, 0x66, 0x6F, 0x72, 0x20, 0x41, 0x6E,
+                0x64, 0x72, 0x6F, 0x69, 0x64, 0x29, 0x2E
+        });
+
+        buffer.position(12);
+        buffer.putInt(hdlr.type);
+        buffer.putInt(hdlr.subType);
+        buffer.put(hdlr.bReserved);// always is a zero array
+
+        return buffer.array();
+    }
+    //</editor-fold>
+
+    class TablesInfo {
+
+        public int stts;
+        public int stsc;
+        public int[] stsc_bEntries;
+        public int ctts;
+        public int stsz;
+        public int stsz_default;
+        public int stss;
+        public int stco;
+    }
+}

app/src/main/java/org/schabi/newpipe/streams/SubtitleConverter.java

@@ -1,5 +1,6 @@
 package org.schabi.newpipe.streams;
 
+import org.schabi.newpipe.streams.io.SharpStream;
 import org.w3c.dom.Document;
 import org.w3c.dom.Element;
 import org.w3c.dom.Node;
@@ -12,8 +13,6 @@ import java.nio.charset.Charset;
 import java.text.ParseException;
 import java.util.Locale;
 
-import org.schabi.newpipe.streams.io.SharpStream;
-
 import javax.xml.parsers.DocumentBuilder;
 import javax.xml.parsers.DocumentBuilderFactory;
 import javax.xml.parsers.ParserConfigurationException;
@@ -27,11 +26,11 @@ public class SubtitleConverter {
 
     public void dumpTTML(SharpStream in, final SharpStream out, final boolean ignoreEmptyFrames, final boolean detectYoutubeDuplicateLines
     ) throws IOException, ParseException, SAXException, ParserConfigurationException, XPathExpressionException {
-        
+
         final FrameWriter callback = new FrameWriter() {
             int frameIndex = 0;
             final Charset charset = Charset.forName("utf-8");
-            
+
             @Override
             public void yield(SubtitleFrame frame) throws IOException {
                 if (ignoreEmptyFrames && frame.isEmptyText()) {
@@ -48,13 +47,13 @@ public class SubtitleConverter {
                 out.write(NEW_LINE.getBytes(charset));
             }
         };
-        
+
         read_xml_based(in, callback, detectYoutubeDuplicateLines,
                 "tt", "xmlns", "http://www.w3.org/ns/ttml",
                 new String[]{"timedtext", "head", "wp"},
                 new String[]{"body", "div", "p"},
                 "begin", "end", true
-        );                  
+        );
     }
 
     private void read_xml_based(SharpStream source, FrameWriter callback, boolean detectYoutubeDuplicateLines,
@@ -70,7 +69,7 @@ public class SubtitleConverter {
          * Language parsing is not supported
          */
 
-        byte[] buffer = new byte[source.available()];
+        byte[] buffer = new byte[(int) source.available()];
         source.read(buffer);
 
         DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
@@ -206,7 +205,7 @@ public class SubtitleConverter {
         }
     }
 
-    private static NodeList selectNodes(Document xml, String[] path, String namespaceUri) throws XPathExpressionException {
+    private static NodeList selectNodes(Document xml, String[] path, String namespaceUri) {
         Element ref = xml.getDocumentElement();
 
         for (int i = 0; i < path.length - 1; i++) {

app/src/main/java/org/schabi/newpipe/streams/TrackDataChunk.java

@@ -1,65 +0,0 @@
-package org.schabi.newpipe.streams;
-
-import java.io.InputStream;
-import java.io.IOException;
-
-public class TrackDataChunk extends InputStream {
-
-    private final DataReader base;
-    private int size;
-
-    public TrackDataChunk(DataReader base, int size) {
-        this.base = base;
-        this.size = size;
-    }
-
-    @Override
-    public int read() throws IOException {
-        if (size < 1) {
-            return -1;
-        }
-
-        int res = base.read();
-
-        if (res >= 0) {
-            size--;
-        }
-
-        return res;
-    }
-
-    @Override
-    public int read(byte[] buffer) throws IOException {
-        return read(buffer, 0, buffer.length);
-    }
-
-    @Override
-    public int read(byte[] buffer, int offset, int count) throws IOException {
-        count = Math.min(size, count);
-        int read = base.read(buffer, offset, count);
-        size -= count;
-        return read;
-    }
-
-    @Override
-    public long skip(long amount) throws IOException {
-        long res = base.skipBytes(Math.min(amount, size));
-        size -= res;
-        return res;
-    }
-
-    @Override
-    public int available() {
-        return size;
-    }
-
-    @Override
-    public void close() {
-        size = 0;
-    }
-
-    @Override
-    public boolean markSupported() {
-        return false;
-    }
-}

app/src/main/java/org/schabi/newpipe/streams/WebMReader.java

@@ -1,12 +1,13 @@
 package org.schabi.newpipe.streams;
 
+import org.schabi.newpipe.streams.io.SharpStream;
+
 import java.io.EOFException;
 import java.io.IOException;
+import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.NoSuchElementException;
-import java.util.Objects;
-
-import org.schabi.newpipe.streams.io.SharpStream;
 
 /**
  *
@@ -121,7 +122,7 @@ public class WebMReader {
     }
 
     private String readString(Element parent) throws IOException {
-        return new String(readBlob(parent), "utf-8");
+        return new String(readBlob(parent), StandardCharsets.UTF_8);// or use "utf-8"
     }
 
     private byte[] readBlob(Element parent) throws IOException {
@@ -193,6 +194,7 @@ public class WebMReader {
                     return elem;
                 }
             }
+
             ensure(elem);
         }
 
@@ -306,7 +308,7 @@ public class WebMReader {
                         entry.trackNumber = readNumber(elem);
                         break;
                     case ID_TrackType:
-                        entry.trackType = (int)readNumber(elem);
+                        entry.trackType = (int) readNumber(elem);
                         break;
                     case ID_CodecID:
                         entry.codecId = readString(elem);
@@ -445,7 +447,7 @@ public class WebMReader {
 
     public class SimpleBlock {
 
-        public TrackDataChunk data;
+        public InputStream data;
 
         SimpleBlock(Element ref) {
             this.ref = ref;
@@ -492,7 +494,7 @@ public class WebMReader {
 
                 currentSimpleBlock = readSimpleBlock(elem);
                 if (currentSimpleBlock.trackNumber == tracks[selectedTrack].trackNumber) {
-                    currentSimpleBlock.data = new TrackDataChunk(stream, (int) currentSimpleBlock.dataSize);
+                    currentSimpleBlock.data = stream.getView((int) currentSimpleBlock.dataSize);
                     return currentSimpleBlock;
                 }
 

app/src/main/java/org/schabi/newpipe/streams/WebMWriter.java

@@ -1,20 +1,20 @@
 package org.schabi.newpipe.streams;
 
+import android.support.annotation.NonNull;
+
 import org.schabi.newpipe.streams.WebMReader.Cluster;
 import org.schabi.newpipe.streams.WebMReader.Segment;
 import org.schabi.newpipe.streams.WebMReader.SimpleBlock;
 import org.schabi.newpipe.streams.WebMReader.WebMTrack;
+import org.schabi.newpipe.streams.io.SharpStream;
 
 import java.io.IOException;
 import java.io.InputStream;
-import java.io.UnsupportedEncodingException;
 import java.nio.ByteBuffer;
+import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 
-import org.schabi.newpipe.streams.io.SharpStream;
-
 /**
- *
  * @author kapodamy
  */
 public class WebMWriter {
@@ -94,10 +94,6 @@ public class WebMWriter {
         }
     }
 
-    public long getBytesWritten() {
-        return written;
-    }
-
     public boolean isDone() {
         return done;
     }
@@ -111,7 +107,7 @@ public class WebMWriter {
         parsed = true;
 
         for (SharpStream src : sourceTracks) {
-            src.dispose();
+            src.close();
         }
 
         sourceTracks = null;
@@ -138,42 +134,42 @@ public class WebMWriter {
 
         /* segment */
         listBuffer.add(new byte[]{
-            0x18, 0x53, (byte) 0x80, 0x67, 0x01,
+                0x18, 0x53, (byte) 0x80, 0x67, 0x01,
-            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00// segment content size
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00// segment content size
         });
 
         long baseSegmentOffset = written + listBuffer.get(0).length;
 
         /* seek head */
         listBuffer.add(new byte[]{
-            0x11, 0x4d, (byte) 0x9b, 0x74, (byte) 0xbe,
+                0x11, 0x4d, (byte) 0x9b, 0x74, (byte) 0xbe,
-            0x4d, (byte) 0xbb, (byte) 0x8b,
+                0x4d, (byte) 0xbb, (byte) 0x8b,
-            0x53, (byte) 0xab, (byte) 0x84, 0x15, 0x49, (byte) 0xa9, 0x66, 0x53,
+                0x53, (byte) 0xab, (byte) 0x84, 0x15, 0x49, (byte) 0xa9, 0x66, 0x53,
-            (byte) 0xac, (byte) 0x81, /*info offset*/ 0x43,
+                (byte) 0xac, (byte) 0x81, /*info offset*/ 0x43,
-            0x4d, (byte) 0xbb, (byte) 0x8b, 0x53, (byte) 0xab,
+                0x4d, (byte) 0xbb, (byte) 0x8b, 0x53, (byte) 0xab,
-            (byte) 0x84, 0x16, 0x54, (byte) 0xae, 0x6b, 0x53, (byte) 0xac, (byte) 0x81,
+                (byte) 0x84, 0x16, 0x54, (byte) 0xae, 0x6b, 0x53, (byte) 0xac, (byte) 0x81,
-            /*tracks offset*/ 0x6a,
+                /*tracks offset*/ 0x6a,
-            0x4d, (byte) 0xbb, (byte) 0x8e, 0x53, (byte) 0xab, (byte) 0x84, 0x1f,
+                0x4d, (byte) 0xbb, (byte) 0x8e, 0x53, (byte) 0xab, (byte) 0x84, 0x1f,
-            0x43, (byte) 0xb6, 0x75, 0x53, (byte) 0xac, (byte) 0x84, /*cluster offset [2]*/ 0x00, 0x00, 0x00, 0x00,
+                0x43, (byte) 0xb6, 0x75, 0x53, (byte) 0xac, (byte) 0x84, /*cluster offset [2]*/ 0x00, 0x00, 0x00, 0x00,
-            0x4d, (byte) 0xbb, (byte) 0x8e, 0x53, (byte) 0xab, (byte) 0x84, 0x1c, 0x53,
+                0x4d, (byte) 0xbb, (byte) 0x8e, 0x53, (byte) 0xab, (byte) 0x84, 0x1c, 0x53,
-            (byte) 0xbb, 0x6b, 0x53, (byte) 0xac, (byte) 0x84, /*cues offset [7]*/ 0x00, 0x00, 0x00, 0x00
+                (byte) 0xbb, 0x6b, 0x53, (byte) 0xac, (byte) 0x84, /*cues offset [7]*/ 0x00, 0x00, 0x00, 0x00
         });
 
         /* info */
         listBuffer.add(new byte[]{
-            0x15, 0x49, (byte) 0xa9, 0x66, (byte) 0xa2, 0x2a, (byte) 0xd7, (byte) 0xb1
+                0x15, 0x49, (byte) 0xa9, 0x66, (byte) 0xa2, 0x2a, (byte) 0xd7, (byte) 0xb1
         });
         listBuffer.add(encode(DEFAULT_TIMECODE_SCALE, true));// this value MUST NOT exceed 4 bytes
         listBuffer.add(new byte[]{0x44, (byte) 0x89, (byte) 0x84,
-            0x00, 0x00, 0x00, 0x00,// info.duration
+                0x00, 0x00, 0x00, 0x00,// info.duration
-            
+
-            /* MuxingApp */
+                /* MuxingApp */
-            0x4d, (byte) 0x80, (byte) 0x87, 0x4E, 
+                0x4d, (byte) 0x80, (byte) 0x87, 0x4E,
-            0x65, 0x77, 0x50, 0x69, 0x70, 0x65, // "NewPipe" binary string
+                0x65, 0x77, 0x50, 0x69, 0x70, 0x65, // "NewPipe" binary string
-            
+
-            /* WritingApp */ 
+                /* WritingApp */
-            0x57, 0x41, (byte) 0x87, 0x4E, 
+                0x57, 0x41, (byte) 0x87, 0x4E,
-            0x65, 0x77, 0x50, 0x69, 0x70, 0x65// "NewPipe" binary string
+                0x65, 0x77, 0x50, 0x69, 0x70, 0x65// "NewPipe" binary string
         });
 
         /* tracks */
@@ -200,7 +196,6 @@ public class WebMWriter {
         long nextCueTime = infoTracks[cuesForTrackId].trackType == 1 ? -1 : 0;
         ArrayList<KeyFrame> keyFrames = new ArrayList<>(32);
 
-        //ArrayList<Block> chunks = new ArrayList<>(readers.length);
         ArrayList<Long> clusterOffsets = new ArrayList<>(32);
         ArrayList<Integer> clusterSizes = new ArrayList<>(32);
 
@@ -283,24 +278,21 @@ public class WebMWriter {
 
         long segmentSize = written - offsetSegmentSizeSet - 7;
 
-        // final step write offsets and sizes
+        /* ---- final step write offsets and sizes ---- */
-        out.rewind();
+        seekTo(out, offsetSegmentSizeSet);
-        written = 0;
-
-        skipTo(out, offsetSegmentSizeSet);
         writeLong(out, segmentSize);
 
         if (predefinedDurations[durationFromTrackId] > -1) {
             duration += predefinedDurations[durationFromTrackId];// this value is full-filled in makeTrackEntry() method
         }
-        skipTo(out, offsetInfoDurationSet);
+        seekTo(out, offsetInfoDurationSet);
         writeFloat(out, duration);
 
         firstClusterOffset -= baseSegmentOffset;
-        skipTo(out, offsetClusterSet);
+        seekTo(out, offsetClusterSet);
         writeInt(out, firstClusterOffset);
 
-        skipTo(out, cueReservedOffset);
+        seekTo(out, cueReservedOffset);
 
         /* Cue */
         dump(new byte[]{0x1c, 0x53, (byte) 0xbb, 0x6b, 0x20, 0x00, 0x00}, out);
@@ -321,20 +313,16 @@ public class WebMWriter {
         voidBuffer.putShort((short) (firstClusterOffset - written - 4));
         dump(voidBuffer.array(), out);
 
-        out.rewind();
+        seekTo(out, offsetCuesSet);
-        written = 0;
-
-        skipTo(out, offsetCuesSet);
         writeInt(out, (int) (cueReservedOffset - baseSegmentOffset));
 
-        skipTo(out, cueReservedOffset + 5);
+        seekTo(out, cueReservedOffset + 5);
         writeShort(out, cueSize);
 
         for (int i = 0; i < clusterSizes.size(); i++) {
-            skipTo(out, clusterOffsets.get(i));
+            seekTo(out, clusterOffsets.get(i));
-            byte[] size = ByteBuffer.allocate(4).putInt(clusterSizes.get(i) | 0x200000).array();
+            byte[] buffer = ByteBuffer.allocate(4).putInt(clusterSizes.get(i) | 0x10000000).array();
-            out.write(size, 1, 3);
+            dump(buffer, out);
-            written += 3;
         }
     }
 
@@ -365,20 +353,29 @@ public class WebMWriter {
         bloq.dataSize = (int) res.dataSize;
         bloq.trackNumber = internalTrackId;
         bloq.flags = res.flags;
-        bloq.absoluteTimecode = convertTimecode(res.relativeTimeCode, readersSegment[internalTrackId].info.timecodeScale, DEFAULT_TIMECODE_SCALE);
+        bloq.absoluteTimecode = convertTimecode(res.relativeTimeCode, readersSegment[internalTrackId].info.timecodeScale);
         bloq.absoluteTimecode += readersCluter[internalTrackId].timecode;
 
         return bloq;
     }
 
-    private short convertTimecode(int time, long oldTimeScale, int newTimeScale) {
+    private short convertTimecode(int time, long oldTimeScale) {
-        return (short) (time * (newTimeScale / oldTimeScale));
+        return (short) (time * (DEFAULT_TIMECODE_SCALE / oldTimeScale));
     }
 
-    private void skipTo(SharpStream stream, long absoluteOffset) throws IOException {
+    private void seekTo(SharpStream stream, long offset) throws IOException {
-        absoluteOffset -= written;
+        if (stream.canSeek()) {
-        written += absoluteOffset;
+            stream.seek(offset);
-        stream.skip(absoluteOffset);
+        } else {
+            if (offset > written) {
+                stream.skip(offset - written);
+            } else {
+                stream.rewind();
+                stream.skip(offset);
+            }
+        }
+
+        written = offset;
     }
 
     private void writeLong(SharpStream stream, long number) throws IOException {
@@ -453,7 +450,7 @@ public class WebMWriter {
             /* cluster */
             dump(new byte[]{0x1f, 0x43, (byte) 0xb6, 0x75}, stream);
             clusterOffsets.add(written);// warning: max cluster size is 256 MiB
-            dump(new byte[]{0x20, 0x00, 0x00}, stream);
+            dump(new byte[]{0x10, 0x00, 0x00, 0x00}, stream);
 
             startOffset = written;// size for the this cluster
 
@@ -468,12 +465,12 @@ public class WebMWriter {
     private void makeEBML(SharpStream stream) throws IOException {
         // deafult values
         dump(new byte[]{
-            0x1A, 0x45, (byte) 0xDF, (byte) 0xA3, 0x01, 0x00, 0x00, 0x00,
+                0x1A, 0x45, (byte) 0xDF, (byte) 0xA3, 0x01, 0x00, 0x00, 0x00,
-            0x00, 0x00, 0x00, 0x1F, 0x42, (byte) 0x86, (byte) 0x81, 0x01,
+                0x00, 0x00, 0x00, 0x1F, 0x42, (byte) 0x86, (byte) 0x81, 0x01,
-            0x42, (byte) 0xF7, (byte) 0x81, 0x01, 0x42, (byte) 0xF2, (byte) 0x81, 0x04,
+                0x42, (byte) 0xF7, (byte) 0x81, 0x01, 0x42, (byte) 0xF2, (byte) 0x81, 0x04,
-            0x42, (byte) 0xF3, (byte) 0x81, 0x08, 0x42, (byte) 0x82, (byte) 0x84, 0x77,
+                0x42, (byte) 0xF3, (byte) 0x81, 0x08, 0x42, (byte) 0x82, (byte) 0x84, 0x77,
-            0x65, 0x62, 0x6D, 0x42, (byte) 0x87, (byte) 0x81, 0x02,
+                0x65, 0x62, 0x6D, 0x42, (byte) 0x87, (byte) 0x81, 0x02,
-            0x42, (byte) 0x85, (byte) 0x81, 0x02
+                0x42, (byte) 0x85, (byte) 0x81, 0x02
         }, stream);
     }
 
@@ -618,9 +615,10 @@ public class WebMWriter {
 
         int offset = withLength ? 1 : 0;
         byte[] buffer = new byte[offset + length];
-        long marker = (long) Math.floor((length - 1) / 8);
+        long marker = (long) Math.floor((length - 1f) / 8f);
 
-        for (int i = length - 1, mul = 1; i >= 0; i--, mul *= 0x100) {
+        float mul = 1;
+        for (int i = length - 1; i >= 0; i--, mul *= 0x100) {
             long b = (long) Math.floor(number / mul);
             if (!withLength && i == marker) {
                 b = b | (0x80 >> (length - 1));
@@ -637,11 +635,7 @@ public class WebMWriter {
 
     private ArrayList<byte[]> encode(String value) {
         byte[] str;
-        try {
+        str = value.getBytes(StandardCharsets.UTF_8);// or use "utf-8"
-            str = value.getBytes("utf-8");
-        } catch (UnsupportedEncodingException err) {
-            str = value.getBytes();
-        }
 
         ArrayList<byte[]> buffer = new ArrayList<>(2);
         buffer.add(encode(str.length, false));
@@ -720,9 +714,10 @@ public class WebMWriter {
             return (flags & 0x80) == 0x80;
         }
 
+        @NonNull
         @Override
         public String toString() {
-            return String.format("trackNumber=%s  isKeyFrame=%S  absoluteTimecode=%s", trackNumber, (flags & 0x80) == 0x80, absoluteTimecode);
+            return String.format("trackNumber=%s  isKeyFrame=%S  absoluteTimecode=%s", trackNumber, isKeyframe(), absoluteTimecode);
         }
     }
 }

app/src/main/java/org/schabi/newpipe/streams/io/SharpStream.java

@@ -1,11 +1,12 @@
 package org.schabi.newpipe.streams.io;
 
+import java.io.Closeable;
 import java.io.IOException;
 
 /**
- * based c#
+ * based on c#
  */
-public abstract class SharpStream {
+public abstract class SharpStream  implements Closeable {
 
     public abstract int read() throws IOException;
 
@@ -15,16 +16,14 @@ public abstract class SharpStream {
 
     public abstract long skip(long amount) throws IOException;
 
-
+    public abstract long available();
-    public abstract int available();
 
     public abstract void rewind() throws IOException;
 
+    public abstract boolean isClosed();
 
-    public abstract void dispose();
+    @Override
-
+    public abstract void close();
-    public abstract boolean isDisposed();
-
 
     public abstract boolean canRewind();
 
@@ -32,6 +31,13 @@ public abstract class SharpStream {
 
     public abstract boolean canWrite();
 
+    public boolean canSetLength() {
+        return false;
+    }
+
+    public boolean canSeek() {
+        return false;
+    }
 
     public abstract void write(byte value) throws IOException;
 
@@ -39,9 +45,19 @@ public abstract class SharpStream {
 
     public abstract void write(byte[] buffer, int offset, int count) throws IOException;
 
-    public abstract void flush() throws IOException;
+    public void flush() throws IOException {
+        // STUB
+    }
 
     public void setLength(long length) throws IOException {
         throw new IOException("Not implemented");
     }
+
+    public void seek(long offset) throws IOException {
+        throw new IOException("Not implemented");
+    }
+
+    public long length() throws IOException {
+        throw new UnsupportedOperationException("Unsupported operation");
+    }
 }

app/src/main/java/org/schabi/newpipe/util/CommentTextOnTouchListener.java

@@ -124,7 +124,7 @@ public class CommentTextOnTouchListener implements View.OnTouchListener {
                 .observeOn(AndroidSchedulers.mainThread())
                 .subscribe(info -> {
                     PlayQueue playQueue = new SinglePlayQueue((StreamInfo) info, seconds*1000);
-                    NavigationHelper.playOnPopupPlayer(context, playQueue);
+                    NavigationHelper.playOnPopupPlayer(context, playQueue, false);
                 });
         return true;
     }

app/src/main/java/org/schabi/newpipe/util/ExtractorHelper.java

@@ -243,8 +243,6 @@ public final class ExtractorHelper {
                 context.startActivity(intent);
             } else if (exception instanceof IOException) {
                 Toast.makeText(context, R.string.network_error, Toast.LENGTH_LONG).show();
-            } else if (exception instanceof YoutubeStreamExtractor.GemaException) {
-                Toast.makeText(context, R.string.blocked_by_gema, Toast.LENGTH_LONG).show();
             } else if (exception instanceof ContentNotAvailableException) {
                 Toast.makeText(context, R.string.content_not_available, Toast.LENGTH_LONG).show();
             } else {

app/src/main/java/org/schabi/newpipe/util/FilenameUtils.java

@@ -10,6 +10,9 @@ import java.util.regex.Pattern;
 
 public class FilenameUtils {
 
+    private static final String CHARSET_MOST_SPECIAL = "[\\n\\r|?*<\":\\\\>/']+";
+    private static final String CHARSET_ONLY_LETTERS_AND_DIGITS = "[^\\w\\d]+";
+
     /**
      * #143 #44 #42 #22: make sure that the filename does not contain illegal chars.
      * @param context the context to retrieve strings and preferences from
@@ -18,11 +21,28 @@ public class FilenameUtils {
      */
     public static String createFilename(Context context, String title) {
         SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context);
-        final String key = context.getString(R.string.settings_file_charset_key);
+
-        final String value = sharedPreferences.getString(key, context.getString(R.string.default_file_charset_value));
+        final String charset_ld = context.getString(R.string.charset_letters_and_digits_value);
-        Pattern pattern = Pattern.compile(value);
+        final String charset_ms = context.getString(R.string.charset_most_special_value);
+        final String defaultCharset = context.getString(R.string.default_file_charset_value);
 
         final String replacementChar = sharedPreferences.getString(context.getString(R.string.settings_file_replacement_character_key), "_");
+        String selectedCharset = sharedPreferences.getString(context.getString(R.string.settings_file_charset_key), null);
+
+        final String charset;
+
+        if (selectedCharset == null || selectedCharset.isEmpty()) selectedCharset = defaultCharset;
+
+        if (selectedCharset.equals(charset_ld)) {
+            charset = CHARSET_ONLY_LETTERS_AND_DIGITS;
+        } else if (selectedCharset.equals(charset_ms)) {
+            charset = CHARSET_MOST_SPECIAL;
+        } else {
+            charset = selectedCharset;// ¿is the user using a custom charset?
+        }
+
+        Pattern pattern = Pattern.compile(charset);
+
         return createFilename(title, pattern, replacementChar);
     }
 

app/src/main/java/org/schabi/newpipe/util/ListHelper.java

@@ -430,24 +430,26 @@ public final class ListHelper {
      */
     private static String getResolutionLimit(Context context) {
         String resolutionLimit = null;
-        if (!isWifiActive(context)) {
+        if (isMeteredNetwork(context)) {
             SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
             String defValue = context.getString(R.string.limit_data_usage_none_key);
             String value = preferences.getString(
                     context.getString(R.string.limit_mobile_data_usage_key), defValue);
-            resolutionLimit = value.equals(defValue) ? null : value;
+            resolutionLimit = defValue.equals(value) ? null : value;
         }
         return resolutionLimit;
     }
 
     /**
-     * Are we connected to wifi?
+     * The current network is metered (like mobile data)?
      * @param context App context
-     * @return {@code true} if connected to wifi
+     * @return {@code true} if connected to a metered network
      */
-    private static boolean isWifiActive(Context context)
+    private static boolean isMeteredNetwork(Context context)
     {
         ConnectivityManager manager = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
-        return manager != null && manager.getActiveNetworkInfo() != null && manager.getActiveNetworkInfo().getType() == ConnectivityManager.TYPE_WIFI;
+        if (manager == null || manager.getActiveNetworkInfo() == null) return false;
+
+        return manager.isActiveNetworkMetered();
     }
 }

app/src/main/java/org/schabi/newpipe/util/NavigationHelper.java

@@ -69,12 +69,14 @@ public class NavigationHelper {
     public static Intent getPlayerIntent(@NonNull final Context context,
                                          @NonNull final Class targetClazz,
                                          @NonNull final PlayQueue playQueue,
-                                         @Nullable final String quality) {
+                                         @Nullable final String quality,
+                                         final boolean resumePlayback) {
         Intent intent = new Intent(context, targetClazz);
 
         final String cacheKey = SerializedCache.getInstance().put(playQueue, PlayQueue.class);
         if (cacheKey != null) intent.putExtra(VideoPlayer.PLAY_QUEUE_KEY, cacheKey);
         if (quality != null) intent.putExtra(VideoPlayer.PLAYBACK_QUALITY, quality);
+        intent.putExtra(VideoPlayer.RESUME_PLAYBACK, resumePlayback);
 
         return intent;
     }
@@ -82,16 +84,18 @@ public class NavigationHelper {
     @NonNull
     public static Intent getPlayerIntent(@NonNull final Context context,
                                          @NonNull final Class targetClazz,
-                                         @NonNull final PlayQueue playQueue) {
+                                         @NonNull final PlayQueue playQueue,
-        return getPlayerIntent(context, targetClazz, playQueue, null);
+                                         final boolean resumePlayback) {
+        return getPlayerIntent(context, targetClazz, playQueue, null, resumePlayback);
     }
 
     @NonNull
     public static Intent getPlayerEnqueueIntent(@NonNull final Context context,
                                                 @NonNull final Class targetClazz,
                                                 @NonNull final PlayQueue playQueue,
-                                                final boolean selectOnAppend) {
+                                                final boolean selectOnAppend,
-        return getPlayerIntent(context, targetClazz, playQueue)
+                                                final boolean resumePlayback) {
+        return getPlayerIntent(context, targetClazz, playQueue, resumePlayback)
                 .putExtra(BasePlayer.APPEND_ONLY, true)
                 .putExtra(BasePlayer.SELECT_ON_APPEND, selectOnAppend);
     }
@@ -104,40 +108,41 @@ public class NavigationHelper {
                                          final float playbackSpeed,
                                          final float playbackPitch,
                                          final boolean playbackSkipSilence,
-                                         @Nullable final String playbackQuality) {
+                                         @Nullable final String playbackQuality,
-        return getPlayerIntent(context, targetClazz, playQueue, playbackQuality)
+                                         final boolean resumePlayback) {
+        return getPlayerIntent(context, targetClazz, playQueue, playbackQuality, resumePlayback)
                 .putExtra(BasePlayer.REPEAT_MODE, repeatMode)
                 .putExtra(BasePlayer.PLAYBACK_SPEED, playbackSpeed)
                 .putExtra(BasePlayer.PLAYBACK_PITCH, playbackPitch)
                 .putExtra(BasePlayer.PLAYBACK_SKIP_SILENCE, playbackSkipSilence);
     }
 
-    public static void playOnMainPlayer(final Context context, final PlayQueue queue) {
+    public static void playOnMainPlayer(final Context context, final PlayQueue queue, final boolean resumePlayback) {
-        final Intent playerIntent = getPlayerIntent(context, MainVideoPlayer.class, queue);
+        final Intent playerIntent = getPlayerIntent(context, MainVideoPlayer.class, queue, resumePlayback);
         playerIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
         context.startActivity(playerIntent);
     }
 
-    public static void playOnPopupPlayer(final Context context, final PlayQueue queue) {
+    public static void playOnPopupPlayer(final Context context, final PlayQueue queue, final boolean resumePlayback) {
         if (!PermissionHelper.isPopupEnabled(context)) {
             PermissionHelper.showPopupEnablementToast(context);
             return;
         }
 
         Toast.makeText(context, R.string.popup_playing_toast, Toast.LENGTH_SHORT).show();
-        startService(context, getPlayerIntent(context, PopupVideoPlayer.class, queue));
+        startService(context, getPlayerIntent(context, PopupVideoPlayer.class, queue, resumePlayback));
     }
 
-    public static void playOnBackgroundPlayer(final Context context, final PlayQueue queue) {
+    public static void playOnBackgroundPlayer(final Context context, final PlayQueue queue, final boolean resumePlayback) {
         Toast.makeText(context, R.string.background_player_playing_toast, Toast.LENGTH_SHORT).show();
-        startService(context, getPlayerIntent(context, BackgroundPlayer.class, queue));
+        startService(context, getPlayerIntent(context, BackgroundPlayer.class, queue, resumePlayback));
     }
 
-    public static void enqueueOnPopupPlayer(final Context context, final PlayQueue queue) {
+    public static void enqueueOnPopupPlayer(final Context context, final PlayQueue queue, final boolean resumePlayback) {
-        enqueueOnPopupPlayer(context, queue, false);
+        enqueueOnPopupPlayer(context, queue, false, resumePlayback);
     }
 
-    public static void enqueueOnPopupPlayer(final Context context, final PlayQueue queue, boolean selectOnAppend) {
+    public static void enqueueOnPopupPlayer(final Context context, final PlayQueue queue, boolean selectOnAppend, final boolean resumePlayback) {
         if (!PermissionHelper.isPopupEnabled(context)) {
             PermissionHelper.showPopupEnablementToast(context);
             return;
@@ -145,17 +150,17 @@ public class NavigationHelper {
 
         Toast.makeText(context, R.string.popup_playing_append, Toast.LENGTH_SHORT).show();
         startService(context,
-                getPlayerEnqueueIntent(context, PopupVideoPlayer.class, queue, selectOnAppend));
+                getPlayerEnqueueIntent(context, PopupVideoPlayer.class, queue, selectOnAppend, resumePlayback));
     }
 
-    public static void enqueueOnBackgroundPlayer(final Context context, final PlayQueue queue) {
+    public static void enqueueOnBackgroundPlayer(final Context context, final PlayQueue queue, final boolean resumePlayback) {
-        enqueueOnBackgroundPlayer(context, queue, false);
+        enqueueOnBackgroundPlayer(context, queue, false, resumePlayback);
     }
 
-    public static void enqueueOnBackgroundPlayer(final Context context, final PlayQueue queue, boolean selectOnAppend) {
+    public static void enqueueOnBackgroundPlayer(final Context context, final PlayQueue queue, boolean selectOnAppend, final boolean resumePlayback) {
         Toast.makeText(context, R.string.background_player_append, Toast.LENGTH_SHORT).show();
         startService(context,
-                getPlayerEnqueueIntent(context, BackgroundPlayer.class, queue, selectOnAppend));
+                getPlayerEnqueueIntent(context, BackgroundPlayer.class, queue, selectOnAppend, resumePlayback));
     }
 
     public static void startService(@NonNull final Context context, @NonNull final Intent intent) {

app/src/main/java/org/schabi/newpipe/util/SecondaryStreamHelper.java

@@ -38,7 +38,7 @@ public class SecondaryStreamHelper<T extends Stream> {
     public static AudioStream getAudioStreamFor(@NonNull List<AudioStream> audioStreams, @NonNull VideoStream videoStream) {
         switch (videoStream.getFormat()) {
             case WEBM:
-            case MPEG_4:
+            case MPEG_4:// ¿is mpeg-4 DASH?
                 break;
             default:
                 return null;

app/src/main/java/org/schabi/newpipe/util/SparseArrayUtils.java

@@ -0,0 +1,30 @@
+package org.schabi.newpipe.util;
+
+import android.util.SparseArray;
+
+public abstract class SparseArrayUtils {
+
+	public static <T> void shiftItemsDown(SparseArray<T> sparseArray, int lower, int upper) {
+		for (int i = lower + 1; i <= upper; i++) {
+			final T o = sparseArray.get(i);
+			sparseArray.put(i - 1, o);
+			sparseArray.remove(i);
+		}
+	}
+
+	public static <T> void shiftItemsUp(SparseArray<T> sparseArray, int lower, int upper) {
+		for (int i = upper - 1; i >= lower; i--) {
+			final T o = sparseArray.get(i);
+			sparseArray.put(i + 1, o);
+			sparseArray.remove(i);
+		}
+	}
+
+	public static <T> int[] getKeys(SparseArray<T> sparseArray) {
+		final int[] result = new int[sparseArray.size()];
+		for (int i = 0; i < result.length; i++) {
+			result[i] = sparseArray.keyAt(i);
+		}
+		return result;
+	}
+}

app/src/main/java/org/schabi/newpipe/views/AnimatedProgressBar.java

@@ -0,0 +1,64 @@
+package org.schabi.newpipe.views;
+
+import android.content.Context;
+import android.support.annotation.Nullable;
+import android.util.AttributeSet;
+import android.view.animation.AccelerateDecelerateInterpolator;
+import android.view.animation.Animation;
+import android.view.animation.Transformation;
+import android.widget.ProgressBar;
+
+public final class AnimatedProgressBar extends ProgressBar {
+
+	@Nullable
+	private ProgressBarAnimation animation = null;
+
+	public AnimatedProgressBar(Context context) {
+		super(context);
+	}
+
+	public AnimatedProgressBar(Context context, AttributeSet attrs) {
+		super(context, attrs);
+	}
+
+	public AnimatedProgressBar(Context context, AttributeSet attrs, int defStyleAttr) {
+		super(context, attrs, defStyleAttr);
+	}
+
+	public synchronized void setProgressAnimated(int progress) {
+		cancelAnimation();
+		animation = new ProgressBarAnimation(this, getProgress(), progress);
+		startAnimation(animation);
+	}
+
+	private void cancelAnimation() {
+		if (animation != null) {
+			animation.cancel();
+			animation = null;
+		}
+		clearAnimation();
+	}
+
+	private static class ProgressBarAnimation extends Animation {
+
+		private final AnimatedProgressBar progressBar;
+		private final float from;
+		private final float to;
+
+		ProgressBarAnimation(AnimatedProgressBar progressBar, float from, float to) {
+			super();
+			this.progressBar = progressBar;
+			this.from = from;
+			this.to = to;
+			setDuration(500);
+			setInterpolator(new AccelerateDecelerateInterpolator());
+		}
+
+		@Override
+		protected void applyTransformation(float interpolatedTime, Transformation t) {
+			super.applyTransformation(interpolatedTime, t);
+			float value = from + (to - from) * interpolatedTime;
+			progressBar.setProgress((int) value);
+		}
+	}
+}

app/src/main/java/us/shandian/giga/get/DownloadInitializer.java

@@ -1,185 +1,191 @@
-package us.shandian.giga.get;
+package us.shandian.giga.get;
-
+
-import android.support.annotation.NonNull;
+import android.support.annotation.NonNull;
-import android.util.Log;
+import android.util.Log;
-
+
-import java.io.File;
+import org.schabi.newpipe.streams.io.SharpStream;
-import java.io.IOException;
+
-import java.io.InterruptedIOException;
+import java.io.IOException;
-import java.io.RandomAccessFile;
+import java.io.InterruptedIOException;
-import java.net.HttpURLConnection;
+import java.net.HttpURLConnection;
-import java.nio.channels.ClosedByInterruptException;
+import java.nio.channels.ClosedByInterruptException;
-
+
-import us.shandian.giga.util.Utility;
+import us.shandian.giga.util.Utility;
-
+
-import static org.schabi.newpipe.BuildConfig.DEBUG;
+import static org.schabi.newpipe.BuildConfig.DEBUG;
-
+
-public class DownloadInitializer extends Thread {
+public class DownloadInitializer extends Thread {
-    private final static String TAG = "DownloadInitializer";
+    private final static String TAG = "DownloadInitializer";
-    final static int mId = 0;
+    final static int mId = 0;
-
+    private final static int RESERVE_SPACE_DEFAULT = 5 * 1024 * 1024;// 5 MiB
-    private DownloadMission mMission;
+    private final static int RESERVE_SPACE_MAXIMUM = 150 * 1024 * 1024;// 150 MiB
-    private HttpURLConnection mConn;
+
-
+    private DownloadMission mMission;
-    DownloadInitializer(@NonNull DownloadMission mission) {
+    private HttpURLConnection mConn;
-        mMission = mission;
+
-        mConn = null;
+    DownloadInitializer(@NonNull DownloadMission mission) {
-    }
+        mMission = mission;
-
+        mConn = null;
-    @Override
+    }
-    public void run() {
+
-        if (mMission.current > 0) mMission.resetState();
+    @Override
-
+    public void run() {
-        int retryCount = 0;
+        if (mMission.current > 0) mMission.resetState(false, true, DownloadMission.ERROR_NOTHING);
-        while (true) {
+
-            try {
+        int retryCount = 0;
-                mMission.currentThreadCount = mMission.threadCount;
+        while (true) {
-
+            try {
-                mConn = mMission.openConnection(mId, -1, -1);
+                mMission.currentThreadCount = mMission.threadCount;
-                mMission.establishConnection(mId, mConn);
+
-
+                if (mMission.blocks < 0 && mMission.current == 0) {
-                if (!mMission.running || Thread.interrupted()) return;
+                    // calculate the whole size of the mission
-
+                    long finalLength = 0;
-                mMission.length = Utility.getContentLength(mConn);
+                    long lowestSize = Long.MAX_VALUE;
-
+
-
+                    for (int i = 0; i < mMission.urls.length && mMission.running; i++) {
-                if (mMission.length == 0) {
+                        mConn = mMission.openConnection(mMission.urls[i], mId, -1, -1);
-                    mMission.notifyError(DownloadMission.ERROR_HTTP_NO_CONTENT, null);
+                        mMission.establishConnection(mId, mConn);
-                    return;
+
-                }
+                        if (Thread.interrupted()) return;
-
+                        long length = Utility.getContentLength(mConn);
-                // check for dynamic generated content
+
-                if (mMission.length == -1 && mConn.getResponseCode() == 200) {
+                        if (i == 0) mMission.length = length;
-                    mMission.blocks = 0;
+                        if (length > 0) finalLength += length;
-                    mMission.length = 0;
+                        if (length < lowestSize) lowestSize = length;
-                    mMission.fallback = true;
+                    }
-                    mMission.unknownLength = true;
+
-                    mMission.currentThreadCount = 1;
+                    mMission.nearLength = finalLength;
-
+
-                    if (DEBUG) {
+                    // reserve space at the start of the file
-                        Log.d(TAG, "falling back (unknown length)");
+                    if (mMission.psAlgorithm != null && mMission.psAlgorithm.reserveSpace) {
-                    }
+                        if (lowestSize < 1) {
-                } else {
+                            // the length is unknown use the default size
-                    // Open again
+                            mMission.offsets[0] = RESERVE_SPACE_DEFAULT;
-                    mConn = mMission.openConnection(mId, mMission.length - 10, mMission.length);
+                        } else {
-                    mMission.establishConnection(mId, mConn);
+                            // use the smallest resource size to download, otherwise, use the maximum
-
+                            mMission.offsets[0] = lowestSize < RESERVE_SPACE_MAXIMUM ? lowestSize : RESERVE_SPACE_MAXIMUM;
-                    if (!mMission.running || Thread.interrupted()) return;
+                        }
-
+                    }
-                    synchronized (mMission.blockState) {
+                } else {
-                        if (mConn.getResponseCode() == 206) {
+                    // ask for the current resource length
-                            if (mMission.currentThreadCount > 1) {
+                    mConn = mMission.openConnection(mId, -1, -1);
-                                mMission.blocks = mMission.length / DownloadMission.BLOCK_SIZE;
+                    mMission.establishConnection(mId, mConn);
-
+
-                                if (mMission.currentThreadCount > mMission.blocks) {
+                    if (!mMission.running || Thread.interrupted()) return;
-                                    mMission.currentThreadCount = (int) mMission.blocks;
+
-                                }
+                    mMission.length = Utility.getContentLength(mConn);
-                                if (mMission.currentThreadCount <= 0) {
+                }
-                                    mMission.currentThreadCount = 1;
+
-                                }
+                if (mMission.length == 0 || mConn.getResponseCode() == 204) {
-                                if (mMission.blocks * DownloadMission.BLOCK_SIZE < mMission.length) {
+                    mMission.notifyError(DownloadMission.ERROR_HTTP_NO_CONTENT, null);
-                                    mMission.blocks++;
+                    return;
-                                }
+                }
-                            } else {
+
-                                // if one thread is solicited don't calculate blocks, is useless
+                // check for dynamic generated content
-                                mMission.blocks = 1;
+                if (mMission.length == -1 && mConn.getResponseCode() == 200) {
-                                mMission.fallback = true;
+                    mMission.blocks = 0;
-                                mMission.unknownLength = false;
+                    mMission.length = 0;
-                            }
+                    mMission.fallback = true;
-
+                    mMission.unknownLength = true;
-                            if (DEBUG) {
+                    mMission.currentThreadCount = 1;
-                                Log.d(TAG, "http response code = " + mConn.getResponseCode());
+
-                            }
+                    if (DEBUG) {
-                        } else {
+                        Log.d(TAG, "falling back (unknown length)");
-                            // Fallback to single thread
+                    }
-                            mMission.blocks = 0;
+                } else {
-                            mMission.fallback = true;
+                    // Open again
-                            mMission.unknownLength = false;
+                    mConn = mMission.openConnection(mId, mMission.length - 10, mMission.length);
-                            mMission.currentThreadCount = 1;
+                    mMission.establishConnection(mId, mConn);
-
+
-                            if (DEBUG) {
+                    if (!mMission.running || Thread.interrupted()) return;
-                                Log.d(TAG, "falling back due http response code = " + mConn.getResponseCode());
+
-                            }
+                    synchronized (mMission.blockState) {
-                        }
+                        if (mConn.getResponseCode() == 206) {
-
+                            if (mMission.currentThreadCount > 1) {
-                        for (long i = 0; i < mMission.currentThreadCount; i++) {
+                                mMission.blocks = mMission.length / DownloadMission.BLOCK_SIZE;
-                            mMission.threadBlockPositions.add(i);
+
-                            mMission.threadBytePositions.add(0L);
+                                if (mMission.currentThreadCount > mMission.blocks) {
-                        }
+                                    mMission.currentThreadCount = (int) mMission.blocks;
-                    }
+                                }
-
+                                if (mMission.currentThreadCount <= 0) {
-                    if (!mMission.running || Thread.interrupted()) return;
+                                    mMission.currentThreadCount = 1;
-                }
+                                }
-
+                                if (mMission.blocks * DownloadMission.BLOCK_SIZE < mMission.length) {
-                File file;
+                                    mMission.blocks++;
-                if (mMission.current == 0) {
+                                }
-                    file = new File(mMission.location);
+                            } else {
-                    if (!Utility.mkdir(file, true)) {
+                                // if one thread is solicited don't calculate blocks, is useless
-                        mMission.notifyError(DownloadMission.ERROR_PATH_CREATION, null);
+                                mMission.blocks = 1;
-                        return;
+                                mMission.fallback = true;
-                    }
+                                mMission.unknownLength = false;
-
+                            }
-                    file = new File(file, mMission.name);
+
-
+                            if (DEBUG) {
-                    // if the name is used by another process, delete it
+                                Log.d(TAG, "http response code = " + mConn.getResponseCode());
-                    if (file.exists() && !file.isFile() && !file.delete()) {
+                            }
-                        mMission.notifyError(DownloadMission.ERROR_FILE_CREATION, null);
+                        } else {
-                        return;
+                            // Fallback to single thread
-                    }
+                            mMission.blocks = 0;
-
+                            mMission.fallback = true;
-                    if (!file.exists() && !file.createNewFile()) {
+                            mMission.unknownLength = false;
-                        mMission.notifyError(DownloadMission.ERROR_FILE_CREATION, null);
+                            mMission.currentThreadCount = 1;
-                        return;
+
-                    }
+                            if (DEBUG) {
-                } else {
+                                Log.d(TAG, "falling back due http response code = " + mConn.getResponseCode());
-                    file = new File(mMission.location, mMission.name);
+                            }
-                }
+                        }
-
+
-                RandomAccessFile af = new RandomAccessFile(file, "rw");
+                        for (long i = 0; i < mMission.currentThreadCount; i++) {
-                af.setLength(mMission.offsets[mMission.current] + mMission.length);
+                            mMission.threadBlockPositions.add(i);
-                af.seek(mMission.offsets[mMission.current]);
+                            mMission.threadBytePositions.add(0L);
-                af.close();
+                        }
-
+                    }
-                if (!mMission.running || Thread.interrupted()) return;
+
-
+                    if (!mMission.running || Thread.interrupted()) return;
-                mMission.running = false;
+                }
-                break;
+
-            } catch (InterruptedIOException | ClosedByInterruptException e) {
+                SharpStream fs = mMission.storage.getStream();
-                return;
+                fs.setLength(mMission.offsets[mMission.current] + mMission.length);
-            } catch (Exception e) {
+                fs.seek(mMission.offsets[mMission.current]);
-                if (!mMission.running) return;
+                fs.close();
-
+
-                if (e instanceof IOException && e.getMessage().contains("Permission denied")) {
+                if (!mMission.running || Thread.interrupted()) return;
-                    mMission.notifyError(DownloadMission.ERROR_PERMISSION_DENIED, e);
+
-                    return;
+                mMission.running = false;
-                }
+                break;
-
+            } catch (InterruptedIOException | ClosedByInterruptException e) {
-                if (retryCount++ > mMission.maxRetry) {
+                return;
-                    Log.e(TAG, "initializer failed", e);
+            } catch (Exception e) {
-                    mMission.notifyError(e);
+                if (!mMission.running) return;
-                    return;
+
-                }
+                if (e instanceof IOException && e.getMessage().contains("Permission denied")) {
-
+                    mMission.notifyError(DownloadMission.ERROR_PERMISSION_DENIED, e);
-                Log.e(TAG, "initializer failed, retrying", e);
+                    return;
-            }
+                }
-        }
+
-
+                if (retryCount++ > mMission.maxRetry) {
-        // hide marquee in the progress bar
+                    Log.e(TAG, "initializer failed", e);
-        mMission.done++;
+                    mMission.notifyError(e);
-
+                    return;
-        mMission.start();
+                }
-    }
+
-
+                Log.e(TAG, "initializer failed, retrying", e);
-    @Override
+            }
-    public void interrupt() {
+        }
-        super.interrupt();
+
-
+        mMission.start();
-        if (mConn != null) {
+    }
-            try {
+
-                mConn.disconnect();
+    @Override
-            } catch (Exception e) {
+    public void interrupt() {
-                // nothing to do
+        super.interrupt();
-            }
+
-        }
+        if (mConn != null) {
-    }
+            try {
-}
+                mConn.disconnect();
+            } catch (Exception e) {
+                // nothing to do
+            }
+        }
+    }
+}

app/src/main/java/us/shandian/giga/get/DownloadMission.java

@@ -4,11 +4,14 @@ import android.os.Handler;
 import android.os.Message;
 import android.util.Log;
 
+import org.schabi.newpipe.Downloader;
+
 import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.net.ConnectException;
 import java.net.HttpURLConnection;
+import java.net.SocketTimeoutException;
 import java.net.URL;
 import java.net.UnknownHostException;
 import java.util.ArrayList;
@@ -17,6 +20,7 @@ import java.util.List;
 
 import javax.net.ssl.SSLException;
 
+import us.shandian.giga.io.StoredFileHelper;
 import us.shandian.giga.postprocessing.Postprocessing;
 import us.shandian.giga.service.DownloadManagerService;
 import us.shandian.giga.util.Utility;
@@ -24,7 +28,7 @@ import us.shandian.giga.util.Utility;
 import static org.schabi.newpipe.BuildConfig.DEBUG;
 
 public class DownloadMission extends Mission {
-    private static final long serialVersionUID = 3L;// last bump: 8 november 2018
+    private static final long serialVersionUID = 4L;// last bump: 27 march 2019
 
     static final int BUFFER_SIZE = 64 * 1024;
     final static int BLOCK_SIZE = 512 * 1024;
@@ -40,6 +44,11 @@ public class DownloadMission extends Mission {
     public static final int ERROR_UNKNOWN_HOST = 1005;
     public static final int ERROR_CONNECT_HOST = 1006;
     public static final int ERROR_POSTPROCESSING = 1007;
+    public static final int ERROR_POSTPROCESSING_STOPPED = 1008;
+    public static final int ERROR_POSTPROCESSING_HOLD = 1009;
+    public static final int ERROR_INSUFFICIENT_STORAGE = 1010;
+    public static final int ERROR_PROGRESS_LOST = 1011;
+    public static final int ERROR_TIMEOUT = 1012;
     public static final int ERROR_HTTP_NO_CONTENT = 204;
     public static final int ERROR_HTTP_UNSUPPORTED_RANGE = 206;
 
@@ -68,43 +77,34 @@ public class DownloadMission extends Mission {
      */
     public long[] offsets;
 
-    /**
-     * The post-processing algorithm arguments
-     */
-    public String[] postprocessingArgs;
-
-    /**
-     * The post-processing algorithm name
-     */
-    public String postprocessingName;
-
     /**
      * Indicates if the post-processing state:
      * 0: ready
      * 1: running
      * 2: completed
+     * 3: hold
      */
-    public int postprocessingState;
+    public volatile int psState;
 
     /**
-     * Indicate if the post-processing algorithm works on the same file
+     * the post-processing algorithm instance
      */
-    public boolean postprocessingThis;
+    public Postprocessing psAlgorithm;
 
     /**
-     * The current resource to download {@code urls[current]}
+     * The current resource to download, see {@code urls[current]} and {@code offsets[current]}
      */
     public int current;
 
     /**
      * Metadata where the mission state is saved
      */
-    public File metadata;
+    public transient File metadata;
 
     /**
      * maximum attempts
      */
-    public int maxRetry;
+    public transient int maxRetry;
 
     /**
      * Approximated final length, this represent the sum of all resources sizes
@@ -115,11 +115,11 @@ public class DownloadMission extends Mission {
     boolean fallback;
     private int finishCount;
     public transient boolean running;
-    public transient boolean enqueued = true;
+    public boolean enqueued;
 
     public int errCode = ERROR_NOTHING;
 
-    public transient Exception errObject = null;
+    public Exception errObject = null;
     public transient boolean recovered;
     public transient Handler mHandler;
     private transient boolean mWritingToFile;
@@ -131,41 +131,26 @@ public class DownloadMission extends Mission {
 
     private transient boolean deleted;
     int currentThreadCount;
-    private transient Thread[] threads = new Thread[0];
+    public transient volatile Thread[] threads = new Thread[0];
     private transient Thread init = null;
 
-
     protected DownloadMission() {
 
     }
 
-    public DownloadMission(String url, String name, String location, char kind) {
+    public DownloadMission(String[] urls, StoredFileHelper storage, char kind, Postprocessing psInstance) {
-        this(new String[]{url}, name, location, kind, null, null);
-    }
-
-    public DownloadMission(String[] urls, String name, String location, char kind, String postprocessingName, String[] postprocessingArgs) {
-        if (name == null) throw new NullPointerException("name is null");
-        if (name.isEmpty()) throw new IllegalArgumentException("name is empty");
         if (urls == null) throw new NullPointerException("urls is null");
         if (urls.length < 1) throw new IllegalArgumentException("urls is empty");
-        if (location == null) throw new NullPointerException("location is null");
-        if (location.isEmpty()) throw new IllegalArgumentException("location is empty");
         this.urls = urls;
-        this.name = name;
-        this.location = location;
         this.kind = kind;
         this.offsets = new long[urls.length];
+        this.enqueued = true;
+        this.maxRetry = 3;
+        this.storage = storage;
+        this.psAlgorithm = psInstance;
 
-        if (postprocessingName != null) {
+        if (DEBUG && psInstance == null && urls.length > 1) {
-            Postprocessing algorithm = Postprocessing.getAlgorithm(postprocessingName, null);
+            Log.w(TAG, "mission created with multiple urls ¿missing post-processing algorithm?");
-            this.postprocessingThis = algorithm.worksOnSameFile;
-            this.offsets[0] = algorithm.recommendedReserve;
-            this.postprocessingName = postprocessingName;
-            this.postprocessingArgs = postprocessingArgs;
-        } else {
-            if (DEBUG && urls.length > 1) {
-                Log.w(TAG, "mission created with multiple urls ¿missing post-processing algorithm?");
-            }
         }
     }
 
@@ -183,6 +168,7 @@ public class DownloadMission extends Mission {
      */
     boolean isBlockPreserved(long block) {
         checkBlock(block);
+        //noinspection ConstantConditions
         return blockState.containsKey(block) ? blockState.get(block) : false;
     }
 
@@ -243,9 +229,18 @@ public class DownloadMission extends Mission {
      * @throws IOException if an I/O exception occurs.
      */
     HttpURLConnection openConnection(int threadId, long rangeStart, long rangeEnd) throws IOException {
-        URL url = new URL(urls[current]);
+        return openConnection(urls[current], threadId, rangeStart, rangeEnd);
-        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
+    }
+
+    HttpURLConnection openConnection(String url, int threadId, long rangeStart, long rangeEnd) throws IOException {
+        HttpURLConnection conn = (HttpURLConnection) new URL(url).openConnection();
         conn.setInstanceFollowRedirects(true);
+        conn.setRequestProperty("User-Agent", Downloader.USER_AGENT);
+        conn.setRequestProperty("Accept", "*/*");
+
+        // BUG workaround: switching between networks can freeze the download forever
+        conn.setConnectTimeout(30000);
+        conn.setReadTimeout(10000);
 
         if (rangeStart >= 0) {
             String req = "bytes=" + rangeStart + "-";
@@ -337,17 +332,42 @@ public class DownloadMission extends Mission {
             notifyError(ERROR_CONNECT_HOST, null);
         } else if (err instanceof UnknownHostException) {
             notifyError(ERROR_UNKNOWN_HOST, null);
+        } else if (err instanceof SocketTimeoutException) {
+            notifyError(ERROR_TIMEOUT, null);
         } else {
             notifyError(ERROR_UNKNOWN_EXCEPTION, err);
         }
     }
 
-    synchronized void notifyError(int code, Exception err) {
+    public synchronized void notifyError(int code, Exception err) {
         Log.e(TAG, "notifyError() code = " + code, err);
 
+        if (err instanceof IOException) {
+            if (!storage.canWrite() || err.getMessage().contains("Permission denied")) {
+                code = ERROR_PERMISSION_DENIED;
+                err = null;
+            } else if (err.getMessage().contains("ENOSPC")) {
+                code = ERROR_INSUFFICIENT_STORAGE;
+                err = null;
+            }
+        }
+
         errCode = code;
         errObject = err;
 
+        switch (code) {
+            case ERROR_SSL_EXCEPTION:
+            case ERROR_UNKNOWN_HOST:
+            case ERROR_CONNECT_HOST:
+            case ERROR_TIMEOUT:
+                // do not change the queue flag for network errors, can be
+                // recovered silently without the user interaction
+                break;
+            default:
+                // also checks for server errors
+                if (code < 500 || code > 599) enqueued = false;
+        }
+
         pause();
 
         notify(DownloadManagerService.MESSAGE_ERROR);
@@ -378,6 +398,7 @@ public class DownloadMission extends Mission {
 
             if (!doPostprocessing()) return;
 
+            enqueued = false;
             running = false;
             deleteThisFromFile();
 
@@ -386,25 +407,23 @@ public class DownloadMission extends Mission {
     }
 
     private void notifyPostProcessing(int state) {
-        if (DEBUG) {
+        String action;
-            String action;
+        switch (state) {
-            switch (state) {
+            case 1:
-                case 1:
+                action = "Running";
-                    action = "Running";
+                break;
-                    break;
+            case 2:
-                case 2:
+                action = "Completed";
-                    action = "Completed";
+                break;
-                    break;
+            default:
-                default:
+                action = "Failed";
-                    action = "Failed";
-            }
-
-            Log.d(TAG, action + " postprocessing on " + location + File.separator + name);
         }
 
+        Log.d(TAG, action + " postprocessing on " + storage.getName());
+
         synchronized (blockState) {
             // don't return without fully write the current state
-            postprocessingState = state;
+            psState = state;
             Utility.writeToFile(metadata, DownloadMission.this);
         }
     }
@@ -420,11 +439,10 @@ public class DownloadMission extends Mission {
         if (threads != null)
             for (Thread thread : threads) joinForThread(thread);
 
-        enqueued = false;
         running = true;
         errCode = ERROR_NOTHING;
 
-        if (current >= urls.length && postprocessingName != null) {
+        if (current >= urls.length && psAlgorithm != null) {
             runAsync(1, () -> {
                 if (doPostprocessing()) {
                     running = false;
@@ -463,7 +481,7 @@ public class DownloadMission extends Mission {
     }
 
     /**
-     * Pause the mission, does not affect the blocks that are being downloaded.
+     * Pause the mission
      */
     public synchronized void pause() {
         if (!running) return;
@@ -477,12 +495,11 @@ public class DownloadMission extends Mission {
 
         running = false;
         recovered = true;
-        enqueued = false;
 
         if (init != null && Thread.currentThread() != init && init.isAlive()) {
             init.interrupt();
             synchronized (blockState) {
-                resetState();
+                resetState(false, true, ERROR_NOTHING);
             }
             return;
         }
@@ -514,20 +531,31 @@ public class DownloadMission extends Mission {
     }
 
     /**
-     * Removes the file and the meta file
+     * Removes the downloaded file and the meta file
      */
     @Override
     public boolean delete() {
         deleted = true;
+        if (psAlgorithm != null) psAlgorithm.cleanupTemporalDir();
+
         boolean res = deleteThisFromFile();
-        if (!super.delete()) res = false;
+
+        if (!super.delete()) return false;
         return res;
     }
 
-    void resetState() {
+
+    /**
+     * Resets the mission state
+     *
+     * @param rollback       {@code true} true to forget all progress, otherwise, {@code false}
+     * @param persistChanges {@code true} to commit changes to the metadata file, otherwise, {@code false}
+     */
+    public void resetState(boolean rollback, boolean persistChanges, int errorCode) {
         done = 0;
         blocks = -1;
-        errCode = ERROR_NOTHING;
+        errCode = errorCode;
+        errObject = null;
         fallback = false;
         unknownLength = false;
         finishCount = 0;
@@ -536,7 +564,10 @@ public class DownloadMission extends Mission {
         blockState.clear();
         threads = new Thread[0];
 
-        Utility.writeToFile(metadata, DownloadMission.this);
+        if (rollback) current = 0;
+
+        if (persistChanges)
+            Utility.writeToFile(metadata, DownloadMission.this);
     }
 
     private void initializer() {
@@ -562,7 +593,7 @@ public class DownloadMission extends Mission {
      * @return true, otherwise, false
      */
     public boolean isFinished() {
-        return current >= urls.length && (postprocessingName == null || postprocessingState == 2);
+        return current >= urls.length && (psAlgorithm == null || psState == 2);
     }
 
     /**
@@ -571,7 +602,13 @@ public class DownloadMission extends Mission {
      * @return {@code true} if this mission is unrecoverable
      */
     public boolean isPsFailed() {
-        return postprocessingName != null && errCode == DownloadMission.ERROR_POSTPROCESSING && postprocessingThis;
+        switch (errCode) {
+            case ERROR_POSTPROCESSING:
+            case ERROR_POSTPROCESSING_STOPPED:
+                return psAlgorithm.worksOnSameFile;
+        }
+
+        return false;
     }
 
     /**
@@ -580,12 +617,26 @@ public class DownloadMission extends Mission {
      * @return true, otherwise, false
      */
     public boolean isPsRunning() {
-        return postprocessingName != null && postprocessingState == 1;
+        return psAlgorithm != null && (psState == 1 || psState == 3);
     }
 
+    /**
+     * Indicated if the mission is ready
+     *
+     * @return true, otherwise, false
+     */
+    public boolean isInitialized() {
+        return blocks >= 0; // DownloadMissionInitializer was executed
+    }
+
+    /**
+     * Gets the approximated final length of the file
+     *
+     * @return the length in bytes
+     */
     public long getLength() {
         long calculated;
-        if (postprocessingState == 1) {
+        if (psState == 1 || psState == 3) {
             calculated = length;
         } else {
             calculated = offsets[current < offsets.length ? current : (offsets.length - 1)] + length;
@@ -596,30 +647,67 @@ public class DownloadMission extends Mission {
         return calculated > nearLength ? calculated : nearLength;
     }
 
+    /**
+     * set this mission state on the queue
+     *
+     * @param queue true to add to the queue, otherwise, false
+     */
+    public void setEnqueued(boolean queue) {
+        enqueued = queue;
+        runAsync(-2, this::writeThisToFile);
+    }
+
+    /**
+     * Attempts to continue a blocked post-processing
+     *
+     * @param recover {@code true} to retry, otherwise, {@code false} to cancel
+     */
+    public void psContinue(boolean recover) {
+        psState = 1;
+        errCode = recover ? ERROR_NOTHING : ERROR_POSTPROCESSING;
+        threads[0].interrupt();
+    }
+
+    /**
+     * Indicates whatever the backed storage is invalid
+     *
+     * @return {@code true}, if storage is invalid and cannot be used
+     */
+    public boolean hasInvalidStorage() {
+        return errCode == ERROR_PROGRESS_LOST || storage == null || storage.isInvalid() || !storage.existsAsFile();
+    }
+
+    /**
+     * Indicates whatever is possible to start the mission
+     *
+     * @return {@code true} is this mission its "healthy", otherwise, {@code false}
+     */
+    public boolean isCorrupt() {
+        return (isPsFailed() || errCode == ERROR_POSTPROCESSING_HOLD) || isFinished() || hasInvalidStorage();
+    }
+
     private boolean doPostprocessing() {
-        if (postprocessingName == null || postprocessingState == 2) return true;
+        if (psAlgorithm == null || psState == 2) return true;
+
+        errObject = null;
 
         notifyPostProcessing(1);
         notifyProgress(0);
 
-        Thread.currentThread().setName("[" + TAG + "]  post-processing = " + postprocessingName + "  filename = " + name);
+        if (DEBUG)
+            Thread.currentThread().setName("[" + TAG + "]  ps = " +
+                    psAlgorithm.getClass().getSimpleName() +
+                    "  filename = " + storage.getName()
+            );
+
+        threads = new Thread[]{Thread.currentThread()};
 
         Exception exception = null;
 
         try {
-            Postprocessing
+            psAlgorithm.run(this);
-                    .getAlgorithm(postprocessingName, this)
-                    .run();
         } catch (Exception err) {
-            StringBuilder args = new StringBuilder("  ");
+            Log.e(TAG, "Post-processing failed. " + psAlgorithm.toString(), err);
-            if (postprocessingArgs != null) {
-                for (String arg : postprocessingArgs) {
-                    args.append(", ");
-                    args.append(arg);
-                }
-                args.delete(0, 1);
-            }
-            Log.e(TAG, String.format("Post-processing failed. algorithm = %s  args = [%s]", postprocessingName, args), err);
 
             if (errCode == ERROR_NOTHING) errCode = ERROR_POSTPROCESSING;
 
@@ -669,7 +757,7 @@ public class DownloadMission extends Mission {
         //  >=1:     any download thread
 
         if (DEBUG) {
-            who.setName(String.format("%s[%s] %s", TAG, id, name));
+            who.setName(String.format("%s[%s] %s", TAG, id, storage.getName()));
         }
 
         who.start();

app/src/main/java/us/shandian/giga/get/DownloadRunnable.java

@@ -2,9 +2,10 @@ package us.shandian.giga.get;
 
 import android.util.Log;
 
-import java.io.FileNotFoundException;
+import org.schabi.newpipe.streams.io.SharpStream;
+
+import java.io.IOException;
 import java.io.InputStream;
-import java.io.RandomAccessFile;
 import java.net.HttpURLConnection;
 import java.nio.channels.ClosedByInterruptException;
 
@@ -26,7 +27,6 @@ public class DownloadRunnable extends Thread {
         if (mission == null) throw new NullPointerException("mission is null");
         mMission = mission;
         mId = id;
-        mConn = null;
     }
 
     @Override
@@ -40,12 +40,12 @@ public class DownloadRunnable extends Thread {
             Log.d(TAG, mId + ":recovered: " + mMission.recovered);
         }
 
-        RandomAccessFile f;
+        SharpStream f;
         InputStream is = null;
 
         try {
-            f = new RandomAccessFile(mMission.getDownloadedFile(), "rw");
+            f = mMission.storage.getStream();
-        } catch (FileNotFoundException e) {
+        } catch (IOException e) {
             mMission.notifyError(e);// this never should happen
             return;
         }
@@ -136,6 +136,10 @@ public class DownloadRunnable extends Thread {
                     mMission.setThreadBytePosition(mId, total);// download paused, save progress for this block
 
             } catch (Exception e) {
+                if (DEBUG) {
+                    Log.d(TAG, mId + ": position=" + blockPosition + " total=" + total + " stopped due exception", e);
+                }
+
                 mMission.setThreadBytePosition(mId, total);
 
                 if (!mMission.running || e instanceof ClosedByInterruptException) break;
@@ -145,10 +149,6 @@ public class DownloadRunnable extends Thread {
                     break;
                 }
 
-                if (DEBUG) {
-                    Log.d(TAG, mId + ":position " + blockPosition + " retrying due exception", e);
-                }
-
                 retry = true;
             }
         }

app/src/main/java/us/shandian/giga/get/DownloadRunnableFallback.java

@@ -1,16 +1,15 @@
 package us.shandian.giga.get;
 
-import android.annotation.SuppressLint;
 import android.support.annotation.NonNull;
 import android.util.Log;
 
+import org.schabi.newpipe.streams.io.SharpStream;
+
 import java.io.IOException;
 import java.io.InputStream;
-import java.io.RandomAccessFile;
 import java.net.HttpURLConnection;
 import java.nio.channels.ClosedByInterruptException;
 
-
 import us.shandian.giga.util.Utility;
 
 import static org.schabi.newpipe.BuildConfig.DEBUG;
@@ -19,21 +18,17 @@ import static org.schabi.newpipe.BuildConfig.DEBUG;
  * Single-threaded fallback mode
  */
 public class DownloadRunnableFallback extends Thread {
-    private static final String TAG = "DownloadRunnableFallback";
+    private static final String TAG = "DownloadRunnableFallbac";
 
     private final DownloadMission mMission;
-    private final int mId = 1;
 
     private int mRetryCount = 0;
     private InputStream mIs;
-    private RandomAccessFile mF;
+    private SharpStream mF;
     private HttpURLConnection mConn;
 
     DownloadRunnableFallback(@NonNull DownloadMission mission) {
         mMission = mission;
-        mIs = null;
-        mF = null;
-        mConn = null;
     }
 
     private void dispose() {
@@ -43,15 +38,10 @@ public class DownloadRunnableFallback extends Thread {
             // nothing to do
         }
 
-        try {
+        if (mF != null) mF.close();
-            if (mF != null) mF.close();
-        } catch (IOException e) {
-            // ¿ejected media storage? ¿file deleted? ¿storage ran out of space?
-        }
     }
 
     @Override
-    @SuppressLint("LongLogTag")
     public void run() {
         boolean done;
 
@@ -67,6 +57,7 @@ public class DownloadRunnableFallback extends Thread {
         try {
             long rangeStart = (mMission.unknownLength || start < 1) ? -1 : start;
 
+            int mId = 1;
             mConn = mMission.openConnection(mId, rangeStart, -1);
             mMission.establishConnection(mId, mConn);
 
@@ -81,7 +72,7 @@ public class DownloadRunnableFallback extends Thread {
             if (!mMission.unknownLength)
                 mMission.unknownLength = Utility.getContentLength(mConn) == -1;
 
-            mF = new RandomAccessFile(mMission.getDownloadedFile(), "rw");
+            mF = mMission.storage.getStream();
             mF.seek(mMission.offsets[mMission.current] + start);
 
             mIs = mConn.getInputStream();
@@ -110,6 +101,10 @@ public class DownloadRunnableFallback extends Thread {
                 return;
             }
 
+            if (DEBUG) {
+                Log.e(TAG, "got exception, retrying...", e);
+            }
+
             run();// try again
             return;
         }

app/src/main/java/us/shandian/giga/get/FinishedMission.java

@@ -1,16 +1,18 @@
 package us.shandian.giga.get;
 
+import android.support.annotation.NonNull;
+
 public class FinishedMission extends  Mission {
 
     public FinishedMission() {
     }
 
-    public FinishedMission(DownloadMission mission) {
+    public FinishedMission(@NonNull DownloadMission mission) {
         source = mission.source;
         length = mission.length;// ¿or mission.done?
         timestamp = mission.timestamp;
-        name = mission.name;
-        location = mission.location;
         kind = mission.kind;
+        storage = mission.storage;
+
     }
 }

app/src/main/java/us/shandian/giga/get/Mission.java

@@ -1,12 +1,14 @@
 package us.shandian.giga.get;
 
-import java.io.File;
+import android.support.annotation.NonNull;
+
 import java.io.Serializable;
-import java.text.SimpleDateFormat;
 import java.util.Calendar;
 
+import us.shandian.giga.io.StoredFileHelper;
+
 public abstract class Mission implements Serializable {
-    private static final long serialVersionUID = 0L;// last bump: 5 october 2018
+    private static final long serialVersionUID = 1L;// last bump: 27 march 2019
 
     /**
      * Source url of the resource
@@ -23,33 +25,24 @@ public abstract class Mission implements Serializable {
      */
     public long timestamp;
 
-    /**
-     * The filename
-     */
-    public String name;
-
-    /**
-     * The directory to store the download
-     */
-    public String location;
-
     /**
      * pre-defined content type
      */
     public char kind;
 
     /**
-     * get the target file on the storage
+     * The downloaded file
-     *
-     * @return File object
      */
-    public File getDownloadedFile() {
+    public StoredFileHelper storage;
-        return new File(location, name);
-    }
 
+    /**
+     * Delete the downloaded file
+     *
+     * @return {@code true] if and only if the file is successfully deleted, otherwise, {@code false}
+     */
     public boolean delete() {
-        deleted = true;
+        if (storage != null) return storage.delete();
-        return getDownloadedFile().delete();
+        return true;
     }
 
     /**
@@ -57,10 +50,11 @@ public abstract class Mission implements Serializable {
      */
     public transient boolean deleted = false;
 
+    @NonNull
     @Override
     public String toString() {
         Calendar calendar = Calendar.getInstance();
         calendar.setTimeInMillis(timestamp);
-        return "[" + calendar.getTime().toString() + "] " + location + File.separator + name;
+        return "[" + calendar.getTime().toString() + "] " + (storage.isInvalid() ? storage.getName() : storage.getUri());
     }
 }

app/src/main/java/us/shandian/giga/get/sqlite/DownloadDataSource.java

@@ -1,73 +0,0 @@
-package us.shandian.giga.get.sqlite;
-
-import android.content.ContentValues;
-import android.content.Context;
-import android.database.Cursor;
-import android.database.sqlite.SQLiteDatabase;
-import android.util.Log;
-
-import java.util.ArrayList;
-import java.util.List;
-
-import us.shandian.giga.get.DownloadMission;
-import us.shandian.giga.get.FinishedMission;
-import us.shandian.giga.get.Mission;
-
-import static us.shandian.giga.get.sqlite.DownloadMissionHelper.KEY_LOCATION;
-import static us.shandian.giga.get.sqlite.DownloadMissionHelper.KEY_NAME;
-import static us.shandian.giga.get.sqlite.DownloadMissionHelper.MISSIONS_TABLE_NAME;
-
-public class DownloadDataSource {
-
-    private static final String TAG = "DownloadDataSource";
-    private final DownloadMissionHelper downloadMissionHelper;
-
-    public DownloadDataSource(Context context) {
-        downloadMissionHelper = new DownloadMissionHelper(context);
-    }
-
-    public ArrayList<FinishedMission> loadFinishedMissions() {
-        SQLiteDatabase database = downloadMissionHelper.getReadableDatabase();
-        Cursor cursor = database.query(MISSIONS_TABLE_NAME, null, null,
-                null, null, null, DownloadMissionHelper.KEY_TIMESTAMP);
-
-        int count = cursor.getCount();
-        if (count == 0) return new ArrayList<>(1);
-
-        ArrayList<FinishedMission> result = new ArrayList<>(count);
-        while (cursor.moveToNext()) {
-            result.add(DownloadMissionHelper.getMissionFromCursor(cursor));
-        }
-
-        return result;
-    }
-
-    public void addMission(DownloadMission downloadMission) {
-        if (downloadMission == null) throw new NullPointerException("downloadMission is null");
-        SQLiteDatabase database = downloadMissionHelper.getWritableDatabase();
-        ContentValues values = DownloadMissionHelper.getValuesOfMission(downloadMission);
-        database.insert(MISSIONS_TABLE_NAME, null, values);
-    }
-
-    public void deleteMission(Mission downloadMission) {
-        if (downloadMission == null) throw new NullPointerException("downloadMission is null");
-        SQLiteDatabase database = downloadMissionHelper.getWritableDatabase();
-        database.delete(MISSIONS_TABLE_NAME,
-                KEY_LOCATION + " = ? AND " +
-                        KEY_NAME + " = ?",
-                new String[]{downloadMission.location, downloadMission.name});
-    }
-
-    public void updateMission(DownloadMission downloadMission) {
-        if (downloadMission == null) throw new NullPointerException("downloadMission is null");
-        SQLiteDatabase database = downloadMissionHelper.getWritableDatabase();
-        ContentValues values = DownloadMissionHelper.getValuesOfMission(downloadMission);
-        String whereClause = KEY_LOCATION + " = ? AND " +
-                KEY_NAME + " = ?";
-        int rowsAffected = database.update(MISSIONS_TABLE_NAME, values,
-                whereClause, new String[]{downloadMission.location, downloadMission.name});
-        if (rowsAffected != 1) {
-            Log.e(TAG, "Expected 1 row to be affected by update but got " + rowsAffected);
-        }
-    }
-}

app/src/main/java/us/shandian/giga/get/sqlite/DownloadMissionHelper.java

@@ -1,112 +0,0 @@
-package us.shandian.giga.get.sqlite;
-
-import android.content.ContentValues;
-import android.content.Context;
-import android.database.Cursor;
-import android.database.sqlite.SQLiteDatabase;
-import android.database.sqlite.SQLiteOpenHelper;
-
-import us.shandian.giga.get.DownloadMission;
-import us.shandian.giga.get.FinishedMission;
-
-/**
- * SQLiteHelper to store finished {@link us.shandian.giga.get.DownloadMission}'s
- */
-public class DownloadMissionHelper extends SQLiteOpenHelper {
-    private final String TAG = "DownloadMissionHelper";
-
-    // TODO: use NewPipeSQLiteHelper ('s constants) when playlist branch is merged (?)
-    private static final String DATABASE_NAME = "downloads.db";
-
-    private static final int DATABASE_VERSION = 3;
-
-    /**
-     * The table name of download missions
-     */
-    static final String MISSIONS_TABLE_NAME = "download_missions";
-
-    /**
-     * The key to the directory location of the mission
-     */
-    static final String KEY_LOCATION = "location";
-    /**
-     * The key to the urls of a mission
-     */
-    static final String KEY_SOURCE_URL = "url";
-    /**
-     * The key to the name of a mission
-     */
-    static final String KEY_NAME = "name";
-
-    /**
-     * The key to the done.
-     */
-    static final String KEY_DONE = "bytes_downloaded";
-
-    static final String KEY_TIMESTAMP = "timestamp";
-
-    static  final String KEY_KIND = "kind";
-
-    /**
-     * The statement to create the table
-     */
-    private static final String MISSIONS_CREATE_TABLE =
-            "CREATE TABLE " + MISSIONS_TABLE_NAME + " (" +
-                    KEY_LOCATION + " TEXT NOT NULL, " +
-                    KEY_NAME + " TEXT NOT NULL, " +
-                    KEY_SOURCE_URL + " TEXT NOT NULL, " +
-                    KEY_DONE + " INTEGER NOT NULL, " +
-                    KEY_TIMESTAMP + " INTEGER NOT NULL, " +
-                    KEY_KIND + " TEXT NOT NULL, " +
-                    " UNIQUE(" + KEY_LOCATION + ", " + KEY_NAME + "));";
-
-    public DownloadMissionHelper(Context context) {
-        super(context, DATABASE_NAME, null, DATABASE_VERSION);
-    }
-
-    @Override
-    public void onCreate(SQLiteDatabase db) {
-        db.execSQL(MISSIONS_CREATE_TABLE);
-    }
-
-    @Override
-    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
-        if (oldVersion == 2) {
-            db.execSQL("ALTER TABLE " + MISSIONS_TABLE_NAME + " ADD COLUMN " + KEY_KIND + " TEXT;");
-        }
-    }
-
-    /**
-     * Returns all values of the download mission as ContentValues.
-     *
-     * @param downloadMission the download mission
-     * @return the content values
-     */
-    public static ContentValues getValuesOfMission(DownloadMission downloadMission) {
-        ContentValues values = new ContentValues();
-        values.put(KEY_SOURCE_URL, downloadMission.source);
-        values.put(KEY_LOCATION, downloadMission.location);
-        values.put(KEY_NAME, downloadMission.name);
-        values.put(KEY_DONE, downloadMission.done);
-        values.put(KEY_TIMESTAMP, downloadMission.timestamp);
-        values.put(KEY_KIND, String.valueOf(downloadMission.kind));
-        return values;
-    }
-
-    public static FinishedMission getMissionFromCursor(Cursor cursor) {
-        if (cursor == null) throw new NullPointerException("cursor is null");
-
-        String kind = cursor.getString(cursor.getColumnIndex(KEY_KIND));
-        if (kind == null || kind.isEmpty()) kind = "?";
-
-        FinishedMission mission = new FinishedMission();
-        mission.name = cursor.getString(cursor.getColumnIndexOrThrow(KEY_NAME));
-        mission.location = cursor.getString(cursor.getColumnIndexOrThrow(KEY_LOCATION));
-        mission.source = cursor.getString(cursor.getColumnIndexOrThrow(KEY_SOURCE_URL));;
-        mission.length = cursor.getLong(cursor.getColumnIndexOrThrow(KEY_DONE));
-        mission.timestamp = cursor.getLong(cursor.getColumnIndexOrThrow(KEY_TIMESTAMP));
-        mission.kind = kind.charAt(0);
-
-        return mission;
-    }
-}

app/src/main/java/us/shandian/giga/get/sqlite/FinishedMissionStore.java

@@ -0,0 +1,237 @@
+package us.shandian.giga.get.sqlite;
+
+import android.content.ContentValues;
+import android.content.Context;
+import android.database.Cursor;
+import android.database.sqlite.SQLiteDatabase;
+import android.database.sqlite.SQLiteOpenHelper;
+import android.net.Uri;
+import android.support.annotation.NonNull;
+import android.util.Log;
+
+import java.io.File;
+import java.util.ArrayList;
+
+import us.shandian.giga.get.DownloadMission;
+import us.shandian.giga.get.FinishedMission;
+import us.shandian.giga.get.Mission;
+import us.shandian.giga.io.StoredFileHelper;
+
+/**
+ * SQLite helper to store finished {@link us.shandian.giga.get.FinishedMission}'s
+ */
+public class FinishedMissionStore extends SQLiteOpenHelper {
+
+    // TODO: use NewPipeSQLiteHelper ('s constants) when playlist branch is merged (?)
+    private static final String DATABASE_NAME = "downloads.db";
+
+    private static final int DATABASE_VERSION = 4;
+
+    /**
+     * The table name of download missions (old)
+     */
+    private static final String MISSIONS_TABLE_NAME_v2 = "download_missions";
+
+    /**
+     * The table name of download missions
+     */
+    private static final String FINISHED_TABLE_NAME = "finished_missions";
+
+    /**
+     * The key to the urls of a mission
+     */
+    private static final String KEY_SOURCE = "url";
+
+
+    /**
+     * The key to the done.
+     */
+    private static final String KEY_DONE = "bytes_downloaded";
+
+    private static final String KEY_TIMESTAMP = "timestamp";
+
+    private static final String KEY_KIND = "kind";
+
+    private static final String KEY_PATH = "path";
+
+    /**
+     * The statement to create the table
+     */
+    private static final String MISSIONS_CREATE_TABLE =
+            "CREATE TABLE " + FINISHED_TABLE_NAME + " (" +
+                    KEY_PATH + " TEXT NOT NULL, " +
+                    KEY_SOURCE + " TEXT NOT NULL, " +
+                    KEY_DONE + " INTEGER NOT NULL, " +
+                    KEY_TIMESTAMP + " INTEGER NOT NULL, " +
+                    KEY_KIND + " TEXT NOT NULL, " +
+                    " UNIQUE(" + KEY_TIMESTAMP + ", " + KEY_PATH + "));";
+
+
+    private Context context;
+
+    public FinishedMissionStore(Context context) {
+        super(context, DATABASE_NAME, null, DATABASE_VERSION);
+        this.context = context;
+    }
+
+    @Override
+    public void onCreate(SQLiteDatabase db) {
+        db.execSQL(MISSIONS_CREATE_TABLE);
+    }
+
+    @Override
+    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
+        if (oldVersion == 2) {
+            db.execSQL("ALTER TABLE " + MISSIONS_TABLE_NAME_v2 + " ADD COLUMN " + KEY_KIND + " TEXT;");
+            oldVersion++;
+        }
+
+        if (oldVersion == 3) {
+            final String KEY_LOCATION = "location";
+            final String KEY_NAME = "name";
+
+            db.execSQL(MISSIONS_CREATE_TABLE);
+
+            Cursor cursor = db.query(MISSIONS_TABLE_NAME_v2, null, null,
+                    null, null, null, KEY_TIMESTAMP);
+
+            int count = cursor.getCount();
+            if (count > 0) {
+                db.beginTransaction();
+                while (cursor.moveToNext()) {
+                    ContentValues values = new ContentValues();
+                    values.put(KEY_SOURCE, cursor.getString(cursor.getColumnIndex(KEY_SOURCE)));
+                    values.put(KEY_DONE, cursor.getString(cursor.getColumnIndex(KEY_DONE)));
+                    values.put(KEY_TIMESTAMP, cursor.getLong(cursor.getColumnIndex(KEY_TIMESTAMP)));
+                    values.put(KEY_KIND, cursor.getString(cursor.getColumnIndex(KEY_KIND)));
+                    values.put(KEY_PATH, Uri.fromFile(
+                            new File(
+                                    cursor.getString(cursor.getColumnIndex(KEY_LOCATION)),
+                                    cursor.getString(cursor.getColumnIndex(KEY_NAME))
+                            )
+                    ).toString());
+
+                    db.insert(FINISHED_TABLE_NAME, null, values);
+                }
+                db.setTransactionSuccessful();
+                db.endTransaction();
+            }
+
+            cursor.close();
+            db.execSQL("DROP TABLE " + MISSIONS_TABLE_NAME_v2);
+        }
+    }
+
+    /**
+     * Returns all values of the download mission as ContentValues.
+     *
+     * @param downloadMission the download mission
+     * @return the content values
+     */
+    private ContentValues getValuesOfMission(@NonNull Mission downloadMission) {
+        ContentValues values = new ContentValues();
+        values.put(KEY_SOURCE, downloadMission.source);
+        values.put(KEY_PATH, downloadMission.storage.getUri().toString());
+        values.put(KEY_DONE, downloadMission.length);
+        values.put(KEY_TIMESTAMP, downloadMission.timestamp);
+        values.put(KEY_KIND, String.valueOf(downloadMission.kind));
+        return values;
+    }
+
+    private FinishedMission getMissionFromCursor(Cursor cursor) {
+        if (cursor == null) throw new NullPointerException("cursor is null");
+
+        String kind = cursor.getString(cursor.getColumnIndex(KEY_KIND));
+        if (kind == null || kind.isEmpty()) kind = "?";
+
+        String path = cursor.getString(cursor.getColumnIndexOrThrow(KEY_PATH));
+
+        FinishedMission mission = new FinishedMission();
+
+        mission.source = cursor.getString(cursor.getColumnIndexOrThrow(KEY_SOURCE));
+        mission.length = cursor.getLong(cursor.getColumnIndexOrThrow(KEY_DONE));
+        mission.timestamp = cursor.getLong(cursor.getColumnIndexOrThrow(KEY_TIMESTAMP));
+        mission.kind = kind.charAt(0);
+
+        try {
+            mission.storage = new StoredFileHelper(context,null, Uri.parse(path), "");
+        } catch (Exception e) {
+            Log.e("FinishedMissionStore", "failed to load the storage path of: " + path, e);
+            mission.storage = new StoredFileHelper(null, path, "", "");
+        }
+
+        return mission;
+    }
+
+
+    //////////////////////////////////
+    // Data source methods
+    ///////////////////////////////////
+
+    public ArrayList<FinishedMission> loadFinishedMissions() {
+        SQLiteDatabase database = getReadableDatabase();
+        Cursor cursor = database.query(FINISHED_TABLE_NAME, null, null,
+                null, null, null, KEY_TIMESTAMP + " DESC");
+
+        int count = cursor.getCount();
+        if (count == 0) return new ArrayList<>(1);
+
+        ArrayList<FinishedMission> result = new ArrayList<>(count);
+        while (cursor.moveToNext()) {
+            result.add(getMissionFromCursor(cursor));
+        }
+
+        return result;
+    }
+
+    public void addFinishedMission(DownloadMission downloadMission) {
+        if (downloadMission == null) throw new NullPointerException("downloadMission is null");
+        SQLiteDatabase database = getWritableDatabase();
+        ContentValues values = getValuesOfMission(downloadMission);
+        database.insert(FINISHED_TABLE_NAME, null, values);
+    }
+
+    public void deleteMission(Mission mission) {
+        if (mission == null) throw new NullPointerException("mission is null");
+        String ts = String.valueOf(mission.timestamp);
+
+        SQLiteDatabase database = getWritableDatabase();
+
+        if (mission instanceof FinishedMission) {
+            if (mission.storage.isInvalid()) {
+                database.delete(FINISHED_TABLE_NAME, KEY_TIMESTAMP + " = ?", new String[]{ts});
+            } else {
+                database.delete(FINISHED_TABLE_NAME, KEY_TIMESTAMP + " = ? AND " + KEY_PATH + " = ?", new String[]{
+                        ts, mission.storage.getUri().toString()
+                });
+            }
+        } else {
+            throw new UnsupportedOperationException("DownloadMission");
+        }
+    }
+
+    public void updateMission(Mission mission) {
+        if (mission == null) throw new NullPointerException("mission is null");
+        SQLiteDatabase database = getWritableDatabase();
+        ContentValues values = getValuesOfMission(mission);
+        String ts = String.valueOf(mission.timestamp);
+
+        int rowsAffected;
+
+        if (mission instanceof FinishedMission) {
+            if (mission.storage.isInvalid()) {
+                rowsAffected = database.update(FINISHED_TABLE_NAME, values, KEY_TIMESTAMP + " = ?", new String[]{ts});
+            } else {
+                rowsAffected = database.update(FINISHED_TABLE_NAME, values, KEY_PATH + " = ?", new String[]{
+                        mission.storage.getUri().toString()
+                });
+            }
+        } else {
+            throw new UnsupportedOperationException("DownloadMission");
+        }
+
+        if (rowsAffected != 1) {
+            Log.e("FinishedMissionStore", "Expected 1 row to be affected by update but got " + rowsAffected);
+        }
+    }
+}

app/src/main/java/us/shandian/giga/io/ChunkFileInputStream.java

@@ -1,153 +1,148 @@
-package us.shandian.giga.postprocessing.io;
+package us.shandian.giga.io;
-
+
-import org.schabi.newpipe.streams.io.SharpStream;
+import org.schabi.newpipe.streams.io.SharpStream;
-
+
-import java.io.File;
+import java.io.IOException;
-import java.io.IOException;
+
-import java.io.RandomAccessFile;
+public class ChunkFileInputStream extends SharpStream {
-
+
-public class ChunkFileInputStream extends SharpStream {
+    private SharpStream source;
-
+    private final long offset;
-    private RandomAccessFile source;
+    private final long length;
-    private final long offset;
+    private long position;
-    private final long length;
+
-    private long position;
+    public ChunkFileInputStream(SharpStream target, long start) throws IOException {
-
+        this(target, start, target.length());
-    public ChunkFileInputStream(File file, long start, long end, String mode) throws IOException {
+    }
-        source = new RandomAccessFile(file, mode);
+
-        offset = start;
+    public ChunkFileInputStream(SharpStream target, long start, long end) throws IOException {
-        length = end - start;
+        source = target;
-        position = 0;
+        offset = start;
-
+        length = end - start;
-        if (length < 1) {
+        position = 0;
-            source.close();
+
-            throw new IOException("The chunk is empty or invalid");
+        if (length < 1) {
-        }
+            source.close();
-        if (source.length() < end) {
+            throw new IOException("The chunk is empty or invalid");
-            try {
+        }
-                throw new IOException(String.format("invalid file length. expected = %s  found = %s", end, source.length()));
+        if (source.length() < end) {
-            } finally {
+            try {
-                source.close();
+                throw new IOException(String.format("invalid file length. expected = %s  found = %s", end, source.length()));
-            }
+            } finally {
-        }
+                source.close();
-
+            }
-        source.seek(offset);
+        }
-    }
+
-
+        source.seek(offset);
-    /**
+    }
-     * Get absolute position on file
+
-     *
+    /**
-     * @return the position
+     * Get absolute position on file
-     */
+     *
-    public long getFilePointer() {
+     * @return the position
-        return offset + position;
+     */
-    }
+    public long getFilePointer() {
-
+        return offset + position;
-    @Override
+    }
-    public int read() throws IOException {
+
-        if ((position + 1) > length) {
+    @Override
-            return 0;
+    public int read() throws IOException {
-        }
+        if ((position + 1) > length) {
-
+            return 0;
-        int res = source.read();
+        }
-        if (res >= 0) {
+
-            position++;
+        int res = source.read();
-        }
+        if (res >= 0) {
-
+            position++;
-        return res;
+        }
-    }
+
-
+        return res;
-    @Override
+    }
-    public int read(byte b[]) throws IOException {
+
-        return read(b, 0, b.length);
+    @Override
-    }
+    public int read(byte b[]) throws IOException {
-
+        return read(b, 0, b.length);
-    @Override
+    }
-    public int read(byte b[], int off, int len) throws IOException {
+
-        if ((position + len) > length) {
+    @Override
-            len = (int) (length - position);
+    public int read(byte b[], int off, int len) throws IOException {
-        }
+        if ((position + len) > length) {
-        if (len == 0) {
+            len = (int) (length - position);
-            return 0;
+        }
-        }
+        if (len == 0) {
-
+            return 0;
-        int res = source.read(b, off, len);
+        }
-        position += res;
+
-
+        int res = source.read(b, off, len);
-        return res;
+        position += res;
-    }
+
-
+        return res;
-    @Override
+    }
-    public long skip(long pos) throws IOException {
+
-        pos = Math.min(pos + position, length);
+    @Override
-
+    public long skip(long pos) throws IOException {
-        if (pos == 0) {
+        pos = Math.min(pos + position, length);
-            return 0;
+
-        }
+        if (pos == 0) {
-
+            return 0;
-        source.seek(offset + pos);
+        }
-
+
-        long oldPos = position;
+        source.seek(offset + pos);
-        position = pos;
+
-
+        long oldPos = position;
-        return pos - oldPos;
+        position = pos;
-    }
+
-
+        return pos - oldPos;
-    @Override
+    }
-    public int available() {
+
-        return (int) (length - position);
+    @Override
-    }
+    public long available() {
-
+        return (int) (length - position);
-    @SuppressWarnings("EmptyCatchBlock")
+    }
-    @Override
+
-    public void dispose() {
+    @SuppressWarnings("EmptyCatchBlock")
-        try {
+    @Override
-            source.close();
+    public void close() {
-        } catch (IOException err) {
+        source.close();
-        } finally {
+        source = null;
-            source = null;
+    }
-        }
+
-    }
+    @Override
-
+    public boolean isClosed() {
-    @Override
+        return source == null;
-    public boolean isDisposed() {
+    }
-        return source == null;
+
-    }
+    @Override
-
+    public void rewind() throws IOException {
-    @Override
+        position = 0;
-    public void rewind() throws IOException {
+        source.seek(offset);
-        position = 0;
+    }
-        source.seek(offset);
+
-    }
+    @Override
-
+    public boolean canRewind() {
-    @Override
+        return true;
-    public boolean canRewind() {
+    }
-        return true;
+
-    }
+    @Override
-
+    public boolean canRead() {
-    @Override
+        return true;
-    public boolean canRead() {
+    }
-        return true;
+
-    }
+    @Override
-
+    public boolean canWrite() {
-    @Override
+        return false;
-    public boolean canWrite() {
+    }
-        return false;
+
-    }
+    @Override
-
+    public void write(byte value) {
-    @Override
+    }
-    public void write(byte value) {
+
-    }
+    @Override
-
+    public void write(byte[] buffer) {
-    @Override
+    }
-    public void write(byte[] buffer) {
+
-    }
+    @Override
-
+    public void write(byte[] buffer, int offset, int count) {
-    @Override
+    }
-    public void write(byte[] buffer, int offset, int count) {
+
-    }
+}
-
-    @Override
-    public void flush() {
-    }
-}

app/src/main/java/us/shandian/giga/io/CircularFileWriter.java

@@ -0,0 +1,497 @@
+package us.shandian.giga.io;
+
+import android.support.annotation.NonNull;
+
+import org.schabi.newpipe.streams.io.SharpStream;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+
+public class CircularFileWriter extends SharpStream {
+
+    private final static int QUEUE_BUFFER_SIZE = 8 * 1024;// 8 KiB
+    private final static int COPY_BUFFER_SIZE = 128 * 1024; // 128 KiB
+    private final static int NOTIFY_BYTES_INTERVAL = 64 * 1024;// 64 KiB
+    private final static int THRESHOLD_AUX_LENGTH = 15 * 1024 * 1024;// 15 MiB
+
+    private OffsetChecker callback;
+
+    public ProgressReport onProgress;
+    public WriteErrorHandle onWriteError;
+
+    private long reportPosition;
+    private long maxLengthKnown = -1;
+
+    private BufferedFile out;
+    private BufferedFile aux;
+
+    public CircularFileWriter(SharpStream target, File temp, OffsetChecker checker) throws IOException {
+        if (checker == null) {
+            throw new NullPointerException("checker is null");
+        }
+
+        if (!temp.exists()) {
+            if (!temp.createNewFile()) {
+                throw new IOException("Cannot create a temporal file");
+            }
+        }
+
+        aux = new BufferedFile(temp);
+        out = new BufferedFile(target);
+
+        callback = checker;
+
+        reportPosition = NOTIFY_BYTES_INTERVAL;
+    }
+
+    private void flushAuxiliar(long amount) throws IOException {
+        if (aux.length < 1) {
+            return;
+        }
+
+        out.flush();
+        aux.flush();
+
+        boolean underflow = aux.offset < aux.length || out.offset < out.length;
+        byte[] buffer = new byte[COPY_BUFFER_SIZE];
+
+        aux.target.seek(0);
+        out.target.seek(out.length);
+
+        long length = amount;
+        while (length > 0) {
+            int read = (int) Math.min(length, Integer.MAX_VALUE);
+            read = aux.target.read(buffer, 0, Math.min(read, buffer.length));
+
+            if (read < 1) {
+                amount -= length;
+                break;
+            }
+
+            out.writeProof(buffer, read);
+            length -= read;
+        }
+
+        if (underflow) {
+            if (out.offset >= out.length) {
+                // calculate the aux underflow pointer
+                if (aux.offset < amount) {
+                    out.offset += aux.offset;
+                    aux.offset = 0;
+                    out.target.seek(out.offset);
+                } else {
+                    aux.offset -= amount;
+                    out.offset = out.length + amount;
+                }
+            } else {
+                aux.offset = 0;
+            }
+        } else {
+            out.offset += amount;
+            aux.offset -= amount;
+        }
+
+        out.length += amount;
+
+        if (out.length > maxLengthKnown) {
+            maxLengthKnown = out.length;
+        }
+
+        if (amount < aux.length) {
+            // move the excess data to the beginning of the file
+            long readOffset = amount;
+            long writeOffset = 0;
+
+            aux.length -= amount;
+            length = aux.length;
+            while (length > 0) {
+                int read = (int) Math.min(length, Integer.MAX_VALUE);
+                read = aux.target.read(buffer, 0, Math.min(read, buffer.length));
+
+                aux.target.seek(writeOffset);
+                aux.writeProof(buffer, read);
+
+                writeOffset += read;
+                readOffset += read;
+                length -= read;
+
+                aux.target.seek(readOffset);
+            }
+
+            aux.target.setLength(aux.length);
+            return;
+        }
+
+        if (aux.length > THRESHOLD_AUX_LENGTH) {
+            aux.target.setLength(THRESHOLD_AUX_LENGTH);// or setLength(0);
+        }
+
+        aux.reset();
+    }
+
+    /**
+     * Flush any buffer and close the output file. Use this method if the
+     * operation is successful
+     *
+     * @return the final length of the file
+     * @throws IOException if an I/O error occurs
+     */
+    public long finalizeFile() throws IOException {
+        flushAuxiliar(aux.length);
+
+        out.flush();
+
+        // change file length (if required)
+        long length = Math.max(maxLengthKnown, out.length);
+        if (length != out.target.length()) {
+            out.target.setLength(length);
+        }
+
+        close();
+
+        return length;
+    }
+
+    /**
+     * Close the file without flushing any buffer
+     */
+    @Override
+    public void close() {
+        if (out != null) {
+            out.close();
+            out = null;
+        }
+        if (aux != null) {
+            aux.close();
+            aux = null;
+        }
+    }
+
+    @Override
+    public void write(byte b) throws IOException {
+        write(new byte[]{b}, 0, 1);
+    }
+
+    @Override
+    public void write(byte b[]) throws IOException {
+        write(b, 0, b.length);
+    }
+
+    @Override
+    public void write(byte b[], int off, int len) throws IOException {
+        if (len == 0) {
+            return;
+        }
+
+        long available;
+        long offsetOut = out.getOffset();
+        long offsetAux = aux.getOffset();
+        long end = callback.check();
+
+        if (end == -1) {
+            available = Integer.MAX_VALUE;
+        } else if (end < offsetOut) {
+            throw new IOException("The reported offset is invalid: " + end + "<" + offsetOut);
+        } else {
+            available = end - offsetOut;
+        }
+
+        boolean usingAux = aux.length > 0 && offsetOut >= out.length;
+        boolean underflow = offsetAux < aux.length || offsetOut < out.length;
+
+        if (usingAux) {
+            // before continue calculate the final length of aux
+            long length = offsetAux + len;
+            if (underflow) {
+                if (aux.length > length) {
+                    length = aux.length;// the length is not changed
+                }
+            } else {
+                length = aux.length + len;
+            }
+
+            aux.write(b, off, len);
+
+            if (length >= THRESHOLD_AUX_LENGTH && length <= available) {
+                flushAuxiliar(available);
+            }
+        } else {
+            if (underflow) {
+                available = out.length - offsetOut;
+            }
+
+            int length = Math.min(len, (int) available);
+            out.write(b, off, length);
+
+            len -= length;
+            off += length;
+
+            if (len > 0) {
+                aux.write(b, off, len);
+            }
+        }
+
+        if (onProgress != null) {
+            long absoluteOffset = out.getOffset() + aux.getOffset();
+            if (absoluteOffset > reportPosition) {
+                reportPosition = absoluteOffset + NOTIFY_BYTES_INTERVAL;
+                onProgress.report(absoluteOffset);
+            }
+        }
+    }
+
+    @Override
+    public void flush() throws IOException {
+        aux.flush();
+        out.flush();
+
+        long total = out.length + aux.length;
+        if (total > maxLengthKnown) {
+            maxLengthKnown = total;// save the current file length in case the method {@code rewind()} is called
+        }
+    }
+
+    @Override
+    public long skip(long amount) throws IOException {
+        seek(out.getOffset() + aux.getOffset() + amount);
+        return amount;
+    }
+
+    @Override
+    public void rewind() throws IOException {
+        if (onProgress != null) {
+            onProgress.report(-out.length - aux.length);// rollback the whole progress
+        }
+
+        seek(0);
+
+        reportPosition = NOTIFY_BYTES_INTERVAL;
+    }
+
+    @Override
+    public void seek(long offset) throws IOException {
+        long total = out.length + aux.length;
+
+        if (offset == total) {
+            // do not ignore the seek offset if a underflow exists
+            long relativeOffset = out.getOffset() + aux.getOffset();
+            if (relativeOffset == total) {
+                return;
+            }
+        }
+
+        // flush everything, avoid any underflow
+        flush();
+
+        if (offset < 0 || offset > total) {
+            throw new IOException("desired offset is outside of range=0-" + total + " offset=" + offset);
+        }
+
+        if (offset > out.length) {
+            out.seek(out.length);
+            aux.seek(offset - out.length);
+        } else {
+            out.seek(offset);
+            aux.seek(0);
+        }
+    }
+
+    @Override
+    public boolean isClosed() {
+        return out == null;
+    }
+
+    @Override
+    public boolean canRewind() {
+        return true;
+    }
+
+    @Override
+    public boolean canWrite() {
+        return true;
+    }
+
+    @Override
+    public boolean canSeek() {
+        return true;
+    }
+
+    // <editor-fold defaultstate="collapsed" desc="stub read methods">
+    @Override
+    public boolean canRead() {
+        return false;
+    }
+
+    @Override
+    public int read() {
+        throw new UnsupportedOperationException("write-only");
+    }
+
+    @Override
+    public int read(byte[] buffer
+    ) {
+        throw new UnsupportedOperationException("write-only");
+    }
+
+    @Override
+    public int read(byte[] buffer, int offset, int count
+    ) {
+        throw new UnsupportedOperationException("write-only");
+    }
+
+    @Override
+    public long available() {
+        throw new UnsupportedOperationException("write-only");
+    }
+    //</editor-fold>
+
+    public interface OffsetChecker {
+
+        /**
+         * Checks the amount of available space ahead
+         *
+         * @return absolute offset in the file where no more data SHOULD NOT be
+         * written. If the value is -1 the whole file will be used
+         */
+        long check();
+    }
+
+    public interface ProgressReport {
+
+        /**
+         * Report the size of the new file
+         *
+         * @param progress the new size
+         */
+        void report(long progress);
+    }
+
+    public interface WriteErrorHandle {
+
+        /**
+         * Attempts to handle a I/O exception
+         *
+         * @param err the cause
+         * @return {@code true} to retry and continue, otherwise, {@code false}
+         * and throw the exception
+         */
+        boolean handle(Exception err);
+    }
+
+    class BufferedFile {
+
+        protected final SharpStream target;
+
+        private long offset;
+        protected long length;
+
+        private byte[] queue = new byte[QUEUE_BUFFER_SIZE];
+        private int queueSize;
+
+        BufferedFile(File file) throws FileNotFoundException {
+            this.target = new FileStream(file);
+        }
+
+        BufferedFile(SharpStream target) {
+            this.target = target;
+        }
+
+        protected long getOffset() {
+            return offset + queueSize;// absolute offset in the file
+        }
+
+        protected void close() {
+            queue = null;
+            target.close();
+        }
+
+        protected void write(byte b[], int off, int len) throws IOException {
+            while (len > 0) {
+                // if the queue is full, the method available() will flush the queue
+                int read = Math.min(available(), len);
+
+                // enqueue incoming buffer
+                System.arraycopy(b, off, queue, queueSize, read);
+                queueSize += read;
+
+                len -= read;
+                off += read;
+            }
+
+            long total = offset + queueSize;
+            if (total > length) {
+                length = total;// save length
+            }
+        }
+
+        void flush() throws IOException {
+            writeProof(queue, queueSize);
+            offset += queueSize;
+            queueSize = 0;
+        }
+
+        protected void rewind() throws IOException {
+            offset = 0;
+            target.seek(0);
+        }
+
+        protected int available() throws IOException {
+            if (queueSize >= queue.length) {
+                flush();
+                return queue.length;
+            }
+
+            return queue.length - queueSize;
+        }
+
+        void reset() throws IOException {
+            offset = 0;
+            length = 0;
+            target.seek(0);
+        }
+
+        protected void seek(long absoluteOffset) throws IOException {
+            if (absoluteOffset == offset) {
+                return;// nothing to do
+            }
+            offset = absoluteOffset;
+            target.seek(absoluteOffset);
+        }
+
+        void writeProof(byte[] buffer, int length) throws IOException {
+            if (onWriteError == null) {
+                target.write(buffer, 0, length);
+                return;
+            }
+
+            while (true) {
+                try {
+                    target.write(buffer, 0, length);
+                    return;
+                } catch (Exception e) {
+                    if (!onWriteError.handle(e)) {
+                        throw e;// give up
+                    }
+                }
+            }
+        }
+
+        @NonNull
+        @Override
+        public String toString() {
+            String absLength;
+
+            try {
+                absLength = Long.toString(target.length());
+            } catch (IOException e) {
+                absLength = "[" + e.getLocalizedMessage() + "]";
+            }
+
+            return String.format(
+                    "offset=%s  length=%s  queue=%s  absLength=%s",
+                    offset, length, queueSize, absLength
+            );
+        }
+    }
+}

app/src/main/java/us/shandian/giga/io/FileStream.java

@@ -1,126 +1,131 @@
-package us.shandian.giga.postprocessing.io;
+package us.shandian.giga.io;
-
+
-import org.schabi.newpipe.streams.io.SharpStream;
+import android.support.annotation.NonNull;
-
+
-import java.io.IOException;
+import org.schabi.newpipe.streams.io.SharpStream;
-import java.io.RandomAccessFile;
+
-import java.nio.channels.FileChannel;
+import java.io.File;
-
+import java.io.FileNotFoundException;
-/**
+import java.io.IOException;
- * @author kapodamy
+import java.io.RandomAccessFile;
- */
+
-public class FileStream extends SharpStream {
+/**
-
+ * @author kapodamy
-    public enum Mode {
+ */
-        Read,
+public class FileStream extends SharpStream {
-        ReadWrite
+
-    }
+    public RandomAccessFile source;
-
+
-    public RandomAccessFile source;
+    public FileStream(@NonNull File target) throws FileNotFoundException {
-    private final Mode mode;
+        this.source = new RandomAccessFile(target, "rw");
-
+    }
-    public FileStream(String path, Mode mode) throws IOException {
+
-        String flags;
+    public FileStream(@NonNull String path) throws FileNotFoundException {
-
+        this.source = new RandomAccessFile(path, "rw");
-        if (mode == Mode.Read) {
+    }
-            flags = "r";
+
-        } else {
+    @Override
-            flags = "rw";
+    public int read() throws IOException {
-        }
+        return source.read();
-
+    }
-        this.mode = mode;
+
-        source = new RandomAccessFile(path, flags);
+    @Override
-    }
+    public int read(byte b[]) throws IOException {
-
+        return source.read(b);
-    @Override
+    }
-    public int read() throws IOException {
+
-        return source.read();
+    @Override
-    }
+    public int read(byte b[], int off, int len) throws IOException {
-
+        return source.read(b, off, len);
-    @Override
+    }
-    public int read(byte b[]) throws IOException {
+
-        return read(b, 0, b.length);
+    @Override
-    }
+    public long skip(long pos) throws IOException {
-
+        return source.skipBytes((int) pos);
-    @Override
+    }
-    public int read(byte b[], int off, int len) throws IOException {
+
-        return source.read(b, off, len);
+    @Override
-    }
+    public long available() {
-
+        try {
-    @Override
+            return source.length() - source.getFilePointer();
-    public long skip(long pos) throws IOException {
+        } catch (IOException e) {
-        FileChannel fc = source.getChannel();
+            return 0;
-        fc.position(fc.position() + pos);
+        }
-        return pos;
+    }
-    }
+
-
+    @Override
-    @Override
+    public void close() {
-    public int available() {
+        if (source == null) return;
-        try {
+        try {
-            return (int) (source.length() - source.getFilePointer());
+            source.close();
-        } catch (IOException ex) {
+        } catch (IOException err) {
-            return 0;
+            // nothing to do
-        }
+        }
-    }
+        source = null;
-
+    }
-    @SuppressWarnings("EmptyCatchBlock")
+
-    @Override
+    @Override
-    public void dispose() {
+    public boolean isClosed() {
-        try {
+        return source == null;
-            source.close();
+    }
-        } catch (IOException err) {
+
-
+    @Override
-        } finally {
+    public void rewind() throws IOException {
-            source = null;
+        source.seek(0);
-        }
+    }
-    }
+
-
+    @Override
-    @Override
+    public boolean canRewind() {
-    public boolean isDisposed() {
+        return true;
-        return source == null;
+    }
-    }
+
-
+    @Override
-    @Override
+    public boolean canRead() {
-    public void rewind() throws IOException {
+        return true;
-        source.getChannel().position(0);
+    }
-    }
+
-
+    @Override
-    @Override
+    public boolean canWrite() {
-    public boolean canRewind() {
+        return true;
-        return true;
+    }
-    }
+
-
+    @Override
-    @Override
+    public boolean canSeek() {
-    public boolean canRead() {
+        return true;
-        return mode == Mode.Read || mode == Mode.ReadWrite;
+    }
-    }
+
-
+    @Override
-    @Override
+    public boolean canSetLength() {
-    public boolean canWrite() {
+        return true;
-        return mode == Mode.ReadWrite;
+    }
-    }
+
-
+    @Override
-    @Override
+    public void write(byte value) throws IOException {
-    public void write(byte value) throws IOException {
+        source.write(value);
-        source.write(value);
+    }
-    }
+
-
+    @Override
-    @Override
+    public void write(byte[] buffer) throws IOException {
-    public void write(byte[] buffer) throws IOException {
+        source.write(buffer);
-        source.write(buffer);
+    }
-    }
+
-
+    @Override
-    @Override
+    public void write(byte[] buffer, int offset, int count) throws IOException {
-    public void write(byte[] buffer, int offset, int count) throws IOException {
+        source.write(buffer, offset, count);
-        source.write(buffer, offset, count);
+    }
-    }
+
-
+    @Override
-    @Override
+    public void setLength(long length) throws IOException {
-    public void flush() {
+        source.setLength(length);
-    }
+    }
-
+
-    @Override
+    @Override
-    public void setLength(long length) throws IOException {
+    public void seek(long offset) throws IOException {
-        source.setLength(length);
+        source.seek(offset);
-    }
+    }
-}
+
+    @Override
+    public long length() throws IOException {
+        return source.length();
+    }
+}

app/src/main/java/us/shandian/giga/io/FileStreamSAF.java

@@ -0,0 +1,145 @@
+package us.shandian.giga.io;
+
+import android.content.ContentResolver;
+import android.net.Uri;
+import android.os.ParcelFileDescriptor;
+import android.support.annotation.NonNull;
+import android.util.Log;
+
+import org.schabi.newpipe.streams.io.SharpStream;
+
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.nio.channels.FileChannel;
+
+public class FileStreamSAF extends SharpStream {
+
+    private final FileInputStream in;
+    private final FileOutputStream out;
+    private final FileChannel channel;
+    private final ParcelFileDescriptor file;
+
+    private boolean disposed;
+
+    public FileStreamSAF(@NonNull ContentResolver contentResolver, Uri fileUri) throws IOException {
+        // Notes:
+        // the file must exists first
+        // ¡read-write mode must allow seek!
+        // It is not guaranteed to work with files in the cloud (virtual files), tested in local storage devices
+
+        file = contentResolver.openFileDescriptor(fileUri, "rw");
+
+        if (file == null) {
+            throw new IOException("Cannot get the ParcelFileDescriptor for " + fileUri.toString());
+        }
+
+        in = new FileInputStream(file.getFileDescriptor());
+        out = new FileOutputStream(file.getFileDescriptor());
+        channel = out.getChannel();// or use in.getChannel()
+    }
+
+    @Override
+    public int read() throws IOException {
+        return in.read();
+    }
+
+    @Override
+    public int read(byte[] buffer) throws IOException {
+        return in.read(buffer);
+    }
+
+    @Override
+    public int read(byte[] buffer, int offset, int count) throws IOException {
+        return in.read(buffer, offset, count);
+    }
+
+    @Override
+    public long skip(long amount) throws IOException {
+        return in.skip(amount);// ¿or use channel.position(channel.position() + amount)?
+    }
+
+    @Override
+    public long available() {
+        try {
+            return in.available();
+        } catch (IOException e) {
+            return 0;// ¡but not -1!
+        }
+    }
+
+    @Override
+    public void rewind() throws IOException {
+        seek(0);
+    }
+
+    @Override
+    public void close() {
+        try {
+            disposed = true;
+
+            file.close();
+            in.close();
+            out.close();
+            channel.close();
+        } catch (IOException e) {
+            Log.e("FileStreamSAF", "close() error", e);
+        }
+    }
+
+    @Override
+    public boolean isClosed() {
+        return disposed;
+    }
+
+    @Override
+    public boolean canRewind() {
+        return true;
+    }
+
+    @Override
+    public boolean canRead() {
+        return true;
+    }
+
+    @Override
+    public boolean canWrite() {
+        return true;
+    }
+
+    public boolean canSetLength() {
+        return true;
+    }
+
+    public boolean canSeek() {
+        return true;
+    }
+
+    @Override
+    public void write(byte value) throws IOException {
+        out.write(value);
+    }
+
+    @Override
+    public void write(byte[] buffer) throws IOException {
+        out.write(buffer);
+    }
+
+    @Override
+    public void write(byte[] buffer, int offset, int count) throws IOException {
+        out.write(buffer, offset, count);
+    }
+
+    public void setLength(long length) throws IOException {
+        channel.truncate(length);
+    }
+
+    public void seek(long offset) throws IOException {
+        channel.position(offset);
+    }
+
+    @Override
+    public long length() throws IOException {
+        return channel.size();
+    }
+}

app/src/main/java/us/shandian/giga/io/SharpInputStream.java

@@ -1,59 +1,61 @@
-/*
+/*
- * To change this license header, choose License Headers in Project Properties.
+ * To change this license header, choose License Headers in Project Properties.
- * To change this template file, choose Tools | Templates
+ * To change this template file, choose Tools | Templates
- * and open the template in the editor.
+ * and open the template in the editor.
- */
+ */
-package us.shandian.giga.postprocessing.io;
+package us.shandian.giga.io;
-
+
-import android.support.annotation.NonNull;
+import android.support.annotation.NonNull;
-
+
-import org.schabi.newpipe.streams.io.SharpStream;
+import org.schabi.newpipe.streams.io.SharpStream;
-
+
-import java.io.IOException;
+import java.io.IOException;
-import java.io.InputStream;
+import java.io.InputStream;
-
+
-/**
+/**
- * Wrapper for the classic {@link java.io.InputStream}
+ * Wrapper for the classic {@link java.io.InputStream}
- * @author kapodamy
+ *
- */
+ * @author kapodamy
-public class SharpInputStream extends InputStream {
+ */
-
+public class SharpInputStream extends InputStream {
-    private final SharpStream base;
+
-
+    private final SharpStream base;
-    public SharpInputStream(SharpStream base) throws IOException {
+
-        if (!base.canRead()) {
+    public SharpInputStream(SharpStream base) throws IOException {
-            throw new IOException("The provided stream is not readable");
+        if (!base.canRead()) {
-        }
+            throw new IOException("The provided stream is not readable");
-        this.base = base;
+        }
-    }
+        this.base = base;
-
+    }
-    @Override
+
-    public int read() throws IOException {
+    @Override
-        return base.read();
+    public int read() throws IOException {
-    }
+        return base.read();
-
+    }
-    @Override
+
-    public int read(@NonNull byte[] bytes) throws IOException {
+    @Override
-        return base.read(bytes);
+    public int read(@NonNull byte[] bytes) throws IOException {
-    }
+        return base.read(bytes);
-
+    }
-    @Override
+
-    public int read(@NonNull byte[] bytes, int i, int i1) throws IOException {
+    @Override
-        return base.read(bytes, i, i1);
+    public int read(@NonNull byte[] bytes, int i, int i1) throws IOException {
-    }
+        return base.read(bytes, i, i1);
-
+    }
-    @Override
+
-    public long skip(long l) throws IOException {
+    @Override
-        return base.skip(l);
+    public long skip(long l) throws IOException {
-    }
+        return base.skip(l);
-
+    }
-    @Override
+
-    public int available() {
+    @Override
-        return base.available();
+    public int available() {
-    }
+        long res = base.available();
-
+        return res > Integer.MAX_VALUE ? Integer.MAX_VALUE : (int) res;
-    @Override
+    }
-    public void close() {
+
-        base.dispose();
+    @Override
-    }
+    public void close() {
-}
+        base.close();
+    }
+}

app/src/main/java/us/shandian/giga/io/StoredDirectoryHelper.java

@@ -0,0 +1,289 @@
+package us.shandian.giga.io;
+
+import android.annotation.TargetApi;
+import android.content.ContentResolver;
+import android.content.Context;
+import android.content.Intent;
+import android.database.Cursor;
+import android.net.Uri;
+import android.os.Build;
+import android.provider.DocumentsContract;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.support.v4.provider.DocumentFile;
+
+import java.io.File;
+import java.io.IOException;
+import java.net.URI;
+import java.util.ArrayList;
+import java.util.Collections;
+
+import static android.provider.DocumentsContract.Document.COLUMN_DISPLAY_NAME;
+import static android.provider.DocumentsContract.Root.COLUMN_DOCUMENT_ID;
+
+
+public class StoredDirectoryHelper {
+    public final static int PERMISSION_FLAGS = Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION;
+
+    private File ioTree;
+    private DocumentFile docTree;
+
+    private Context context;
+
+    private String tag;
+
+    public StoredDirectoryHelper(@NonNull Context context, @NonNull Uri path, String tag) throws IOException {
+        this.tag = tag;
+
+        if (ContentResolver.SCHEME_FILE.equalsIgnoreCase(path.getScheme())) {
+            this.ioTree = new File(URI.create(path.toString()));
+            return;
+        }
+
+        this.context = context;
+
+        try {
+            this.context.getContentResolver().takePersistableUriPermission(path, PERMISSION_FLAGS);
+        } catch (Exception e) {
+            throw new IOException(e);
+        }
+
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP)
+            throw new IOException("Storage Access Framework with Directory API is not available");
+
+        this.docTree = DocumentFile.fromTreeUri(context, path);
+
+        if (this.docTree == null)
+            throw new IOException("Failed to create the tree from Uri");
+    }
+
+    @TargetApi(Build.VERSION_CODES.KITKAT)
+    public StoredDirectoryHelper(@NonNull URI location, String tag) {
+        ioTree = new File(location);
+        this.tag = tag;
+    }
+
+    public StoredFileHelper createFile(String filename, String mime) {
+        return createFile(filename, mime, false);
+    }
+
+    public StoredFileHelper createUniqueFile(String name, String mime) {
+        ArrayList<String> matches = new ArrayList<>();
+        String[] filename = splitFilename(name);
+        String lcFilename = filename[0].toLowerCase();
+
+        if (docTree == null || Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
+            for (File file : ioTree.listFiles())
+                addIfStartWith(matches, lcFilename, file.getName());
+        } else {
+            // warning: SAF file listing is very slow
+            Uri docTreeChildren = DocumentsContract.buildChildDocumentsUriUsingTree(
+                    docTree.getUri(), DocumentsContract.getDocumentId(docTree.getUri())
+            );
+
+            String[] projection = new String[]{COLUMN_DISPLAY_NAME};
+            String selection = "(LOWER(" + COLUMN_DISPLAY_NAME + ") LIKE ?%";
+            ContentResolver cr = context.getContentResolver();
+
+            try (Cursor cursor = cr.query(docTreeChildren, projection, selection, new String[]{lcFilename}, null)) {
+                if (cursor != null) {
+                    while (cursor.moveToNext())
+                        addIfStartWith(matches, lcFilename, cursor.getString(0));
+                }
+            }
+        }
+
+        if (matches.size() < 1) {
+            return createFile(name, mime, true);
+        } else {
+            // check if the filename is in use
+            String lcName = name.toLowerCase();
+            for (String testName : matches) {
+                if (testName.equals(lcName)) {
+                    lcName = null;
+                    break;
+                }
+            }
+
+            // check if not in use
+            if (lcName != null) return createFile(name, mime, true);
+        }
+
+        Collections.sort(matches, String::compareTo);
+
+        for (int i = 1; i < 1000; i++) {
+            if (Collections.binarySearch(matches, makeFileName(lcFilename, i, filename[1])) < 0)
+                return createFile(makeFileName(filename[0], i, filename[1]), mime, true);
+        }
+
+        return createFile(String.valueOf(System.currentTimeMillis()).concat(filename[1]), mime, false);
+    }
+
+    private StoredFileHelper createFile(String filename, String mime, boolean safe) {
+        StoredFileHelper storage;
+
+        try {
+            if (docTree == null)
+                storage = new StoredFileHelper(ioTree, filename, mime);
+            else
+                storage = new StoredFileHelper(context, docTree, filename, mime, safe);
+        } catch (IOException e) {
+            return null;
+        }
+
+        storage.tag = tag;
+
+        return storage;
+    }
+
+    public Uri getUri() {
+        return docTree == null ? Uri.fromFile(ioTree) : docTree.getUri();
+    }
+
+    public boolean exists() {
+        return docTree == null ? ioTree.exists() : docTree.exists();
+    }
+
+    /**
+     * Indicates whatever if is possible access using the {@code java.io} API
+     *
+     * @return {@code true} for Java I/O API, otherwise, {@code false} for Storage Access Framework
+     */
+    public boolean isDirect() {
+        return docTree == null;
+    }
+
+    /**
+     * Only using Java I/O. Creates the directory named by this abstract pathname, including any
+     * necessary but nonexistent parent directories.  Note that if this
+     * operation fails it may have succeeded in creating some of the necessary
+     * parent directories.
+     *
+     * @return <code>true</code> if and only if the directory was created,
+     * along with all necessary parent directories or already exists; <code>false</code>
+     * otherwise
+     */
+    public boolean mkdirs() {
+        if (docTree == null) {
+            return ioTree.exists() || ioTree.mkdirs();
+        }
+
+        if (docTree.exists()) return true;
+
+        try {
+            DocumentFile parent;
+            String child = docTree.getName();
+
+            while (true) {
+                parent = docTree.getParentFile();
+                if (parent == null || child == null) break;
+                if (parent.exists()) return true;
+
+                parent.createDirectory(child);
+
+                child = parent.getName();// for the next iteration
+            }
+        } catch (Exception e) {
+            // no more parent directories or unsupported by the storage provider
+        }
+
+        return false;
+    }
+
+    public String getTag() {
+        return tag;
+    }
+
+    public Uri findFile(String filename) {
+        if (docTree == null) {
+            File res = new File(ioTree, filename);
+            return res.exists() ? Uri.fromFile(res) : null;
+        }
+
+        DocumentFile res = findFileSAFHelper(context, docTree, filename);
+        return res == null ? null : res.getUri();
+    }
+
+    public boolean canWrite() {
+        return docTree == null ? ioTree.canWrite() : docTree.canWrite();
+    }
+
+    @NonNull
+    @Override
+    public String toString() {
+        return docTree == null ? Uri.fromFile(ioTree).toString() : docTree.getUri().toString();
+    }
+
+
+    ////////////////////
+    //      Utils
+    ///////////////////
+
+    private static void addIfStartWith(ArrayList<String> list, @NonNull String base, String str) {
+        if (str == null || str.isEmpty()) return;
+        str = str.toLowerCase();
+        if (str.startsWith(base)) list.add(str);
+    }
+
+    private static String[] splitFilename(@NonNull String filename) {
+        int dotIndex = filename.lastIndexOf('.');
+
+        if (dotIndex < 0 || (dotIndex == filename.length() - 1))
+            return new String[]{filename, ""};
+
+        return new String[]{filename.substring(0, dotIndex), filename.substring(dotIndex)};
+    }
+
+    private static String makeFileName(String name, int idx, String ext) {
+        return name.concat(" (").concat(String.valueOf(idx)).concat(")").concat(ext);
+    }
+
+    /**
+     * Fast (but not enough) file/directory finder under the storage access framework
+     *
+     * @param context  The context
+     * @param tree     Directory where search
+     * @param filename Target filename
+     * @return A {@link android.support.v4.provider.DocumentFile} contain the reference, otherwise, null
+     */
+    static DocumentFile findFileSAFHelper(@Nullable Context context, DocumentFile tree, String filename) {
+        if (context == null || Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
+            return tree.findFile(filename);// warning: this is very slow
+        }
+
+        if (!tree.canRead()) return null;// missing read permission
+
+        final int name = 0;
+        final int documentId = 1;
+
+        // LOWER() SQL function is not supported
+        String selection = COLUMN_DISPLAY_NAME + " = ?";
+        //String selection = COLUMN_DISPLAY_NAME + " LIKE ?%";
+
+        Uri childrenUri = DocumentsContract.buildChildDocumentsUriUsingTree(
+                tree.getUri(), DocumentsContract.getDocumentId(tree.getUri())
+        );
+        String[] projection = {COLUMN_DISPLAY_NAME, COLUMN_DOCUMENT_ID};
+        ContentResolver contentResolver = context.getContentResolver();
+
+        filename = filename.toLowerCase();
+
+        try (Cursor cursor = contentResolver.query(childrenUri, projection, selection, new String[]{filename}, null)) {
+            if (cursor == null) return null;
+
+            while (cursor.moveToNext()) {
+                if (cursor.isNull(name) || !cursor.getString(name).toLowerCase().startsWith(filename))
+                    continue;
+
+                return DocumentFile.fromSingleUri(
+                        context, DocumentsContract.buildDocumentUriUsingTree(
+                                tree.getUri(), cursor.getString(documentId)
+                        )
+                );
+            }
+        }
+
+        return null;
+    }
+
+}

app/src/main/java/us/shandian/giga/io/StoredFileHelper.java

@@ -0,0 +1,381 @@
+package us.shandian.giga.io;
+
+import android.annotation.TargetApi;
+import android.content.ContentResolver;
+import android.content.Context;
+import android.content.Intent;
+import android.net.Uri;
+import android.os.Build;
+import android.provider.DocumentsContract;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.support.v4.app.Fragment;
+import android.support.v4.provider.DocumentFile;
+
+import org.schabi.newpipe.streams.io.SharpStream;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.Serializable;
+import java.net.URI;
+
+public class StoredFileHelper implements Serializable {
+    private static final long serialVersionUID = 0L;
+    public static final String DEFAULT_MIME = "application/octet-stream";
+
+    private transient DocumentFile docFile;
+    private transient DocumentFile docTree;
+    private transient File ioFile;
+    private transient Context context;
+
+    protected String source;
+    private String sourceTree;
+
+    protected String tag;
+
+    private String srcName;
+    private String srcType;
+
+    public StoredFileHelper(@Nullable Uri parent, String filename, String mime, String tag) {
+        this.source = null;// this instance will be "invalid" see invalidate()/isInvalid() methods
+
+        this.srcName = filename;
+        this.srcType = mime == null ? DEFAULT_MIME : mime;
+        if (parent != null) this.sourceTree = parent.toString();
+
+        this.tag = tag;
+    }
+
+    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
+    StoredFileHelper(@Nullable Context context, DocumentFile tree, String filename, String mime, boolean safe) throws IOException {
+        this.docTree = tree;
+        this.context = context;
+
+        DocumentFile res;
+
+        if (safe) {
+            // no conflicts (the filename is not in use)
+            res = this.docTree.createFile(mime, filename);
+            if (res == null) throw new IOException("Cannot create the file");
+        } else {
+            res = createSAF(context, mime, filename);
+        }
+
+        this.docFile = res;
+
+        this.source = docFile.getUri().toString();
+        this.sourceTree = docTree.getUri().toString();
+
+        this.srcName = this.docFile.getName();
+        this.srcType = this.docFile.getType();
+    }
+
+    StoredFileHelper(File location, String filename, String mime) throws IOException {
+        this.ioFile = new File(location, filename);
+
+        if (this.ioFile.exists()) {
+            if (!this.ioFile.isFile() && !this.ioFile.delete())
+                throw new IOException("The filename is already in use by non-file entity and cannot overwrite it");
+        } else {
+            if (!this.ioFile.createNewFile())
+                throw new IOException("Cannot create the file");
+        }
+
+        this.source = Uri.fromFile(this.ioFile).toString();
+        this.sourceTree = Uri.fromFile(location).toString();
+
+        this.srcName = ioFile.getName();
+        this.srcType = mime;
+    }
+
+    @TargetApi(Build.VERSION_CODES.KITKAT)
+    public StoredFileHelper(Context context, @Nullable Uri parent, @NonNull Uri path, String tag) throws IOException {
+        this.tag = tag;
+        this.source = path.toString();
+
+        if (path.getScheme() == null || path.getScheme().equalsIgnoreCase(ContentResolver.SCHEME_FILE)) {
+            this.ioFile = new File(URI.create(this.source));
+        } else {
+            DocumentFile file = DocumentFile.fromSingleUri(context, path);
+
+            if (file == null) throw new RuntimeException("SAF not available");
+
+            this.context = context;
+
+            if (file.getName() == null) {
+                this.source = null;
+                return;
+            } else {
+                this.docFile = file;
+                takePermissionSAF();
+            }
+        }
+
+        if (parent != null) {
+            if (!ContentResolver.SCHEME_FILE.equals(parent.getScheme()))
+                this.docTree = DocumentFile.fromTreeUri(context, parent);
+
+            this.sourceTree = parent.toString();
+        }
+
+        this.srcName = getName();
+        this.srcType = getType();
+    }
+
+
+    public static StoredFileHelper deserialize(@NonNull StoredFileHelper storage, Context context) throws IOException {
+        Uri treeUri = storage.sourceTree == null ? null : Uri.parse(storage.sourceTree);
+
+        if (storage.isInvalid())
+            return new StoredFileHelper(treeUri, storage.srcName, storage.srcType, storage.tag);
+
+        StoredFileHelper instance = new StoredFileHelper(context, treeUri, Uri.parse(storage.source), storage.tag);
+
+        // under SAF, if the target document is deleted, conserve the filename and mime
+        if (instance.srcName == null) instance.srcName = storage.srcName;
+        if (instance.srcType == null) instance.srcType = storage.srcType;
+
+        return instance;
+    }
+
+    public static void requestSafWithFileCreation(@NonNull Fragment who, int requestCode, String filename, String mime) {
+        // SAF notes:
+        //           ACTION_OPEN_DOCUMENT       Do not let you create the file, useful for overwrite files
+        //           ACTION_CREATE_DOCUMENT     No overwrite support, useless the file provider resolve the conflict
+
+        Intent intent = new Intent(Intent.ACTION_CREATE_DOCUMENT)
+                .addCategory(Intent.CATEGORY_OPENABLE)
+                .setType(mime)
+                .putExtra(Intent.EXTRA_TITLE, filename)
+                .addFlags(Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION | StoredDirectoryHelper.PERMISSION_FLAGS)
+                .putExtra("android.content.extra.SHOW_ADVANCED", true);// hack, show all storage disks
+
+        who.startActivityForResult(intent, requestCode);
+    }
+
+
+    public SharpStream getStream() throws IOException {
+        invalid();
+
+        if (docFile == null)
+            return new FileStream(ioFile);
+        else
+            return new FileStreamSAF(context.getContentResolver(), docFile.getUri());
+    }
+
+    /**
+     * Indicates whatever if is possible access using the {@code java.io} API
+     *
+     * @return {@code true} for Java I/O API, otherwise, {@code false} for Storage Access Framework
+     */
+    public boolean isDirect() {
+        invalid();
+
+        return docFile == null;
+    }
+
+    public boolean isInvalid() {
+        return source == null;
+    }
+
+    public Uri getUri() {
+        invalid();
+
+        return docFile == null ? Uri.fromFile(ioFile) : docFile.getUri();
+    }
+
+    public Uri getParentUri() {
+        invalid();
+
+        return sourceTree == null ? null : Uri.parse(sourceTree);
+    }
+
+    public void truncate() throws IOException {
+        invalid();
+
+        try (SharpStream fs = getStream()) {
+            fs.setLength(0);
+        }
+    }
+
+    public boolean delete() {
+        if (source == null) return true;
+        if (docFile == null) return ioFile.delete();
+
+
+        boolean res = docFile.delete();
+
+        try {
+            int flags = Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION;
+            context.getContentResolver().releasePersistableUriPermission(docFile.getUri(), flags);
+        } catch (Exception ex) {
+            // nothing to do
+        }
+
+        return res;
+    }
+
+    public long length() {
+        invalid();
+
+        return docFile == null ? ioFile.length() : docFile.length();
+    }
+
+    public boolean canWrite() {
+        if (source == null) return false;
+        return docFile == null ? ioFile.canWrite() : docFile.canWrite();
+    }
+
+    public String getName() {
+        if (source == null)
+            return srcName;
+        else if (docFile == null)
+            return ioFile.getName();
+
+        String name = docFile.getName();
+        return name == null ? srcName : name;
+    }
+
+    public String getType() {
+        if (source == null || docFile == null)
+            return srcType;
+
+        String type = docFile.getType();
+        return type == null ? srcType : type;
+    }
+
+    public String getTag() {
+        return tag;
+    }
+
+    public boolean existsAsFile() {
+        if (source == null) return false;
+
+        boolean exists = docFile == null ? ioFile.exists() : docFile.exists();
+        boolean isFile = docFile == null ? ioFile.isFile() : docFile.isFile();// ¿docFile.isVirtual() means is no-physical?
+
+        return exists && isFile;
+    }
+
+    public boolean create() {
+        invalid();
+        boolean result;
+
+        if (docFile == null) {
+            try {
+                result = ioFile.createNewFile();
+            } catch (IOException e) {
+                return false;
+            }
+        } else if (docTree == null) {
+            result = false;
+        } else {
+            if (!docTree.canRead() || !docTree.canWrite()) return false;
+            try {
+                docFile = createSAF(context, srcType, srcName);
+                if (docFile == null || docFile.getName() == null) return false;
+                result = true;
+            } catch (IOException e) {
+                return false;
+            }
+        }
+
+        if (result) {
+            source = (docFile == null ? Uri.fromFile(ioFile) : docFile.getUri()).toString();
+            srcName = getName();
+            srcType = getType();
+        }
+
+        return result;
+    }
+
+    public void invalidate() {
+        if (source == null) return;
+
+        srcName = getName();
+        srcType = getType();
+
+        source = null;
+
+        docTree = null;
+        docFile = null;
+        ioFile = null;
+        context = null;
+    }
+
+    public boolean equals(StoredFileHelper storage) {
+        if (this == storage) return true;
+
+        // note: do not compare tags, files can have the same parent folder
+        //if (stringMismatch(this.tag, storage.tag)) return false;
+
+        if (stringMismatch(getLowerCase(this.sourceTree), getLowerCase(this.sourceTree)))
+            return false;
+
+        if (this.isInvalid() || storage.isInvalid()) {
+            return this.srcName.equalsIgnoreCase(storage.srcName) && this.srcType.equalsIgnoreCase(storage.srcType);
+        }
+
+        if (this.isDirect() != storage.isDirect()) return false;
+
+        if (this.isDirect())
+            return this.ioFile.getPath().equalsIgnoreCase(storage.ioFile.getPath());
+
+        return DocumentsContract.getDocumentId(
+                this.docFile.getUri()
+        ).equalsIgnoreCase(DocumentsContract.getDocumentId(
+                storage.docFile.getUri()
+        ));
+    }
+
+    @NonNull
+    @Override
+    public String toString() {
+        if (source == null)
+            return "[Invalid state] name=" + srcName + "  type=" + srcType + "  tag=" + tag;
+        else
+            return "sourceFile=" + source + "  treeSource=" + (sourceTree == null ? "" : sourceTree) + "  tag=" + tag;
+    }
+
+
+    private void invalid() {
+        if (source == null)
+            throw new IllegalStateException("In invalid state");
+    }
+
+    private void takePermissionSAF() throws IOException {
+        try {
+            context.getContentResolver().takePersistableUriPermission(docFile.getUri(), StoredDirectoryHelper.PERMISSION_FLAGS);
+        } catch (Exception e) {
+            if (docFile.getName() == null) throw new IOException(e);
+        }
+    }
+
+    private DocumentFile createSAF(@Nullable Context context, String mime, String filename) throws IOException {
+        DocumentFile res = StoredDirectoryHelper.findFileSAFHelper(context, docTree, filename);
+
+        if (res != null && res.exists() && res.isDirectory()) {
+            if (!res.delete())
+                throw new IOException("Directory with the same name found but cannot delete");
+            res = null;
+        }
+
+        if (res == null) {
+            res = this.docTree.createFile(srcType == null ? DEFAULT_MIME : mime, filename);
+            if (res == null) throw new IOException("Cannot create the file");
+        }
+
+        return res;
+    }
+
+    private String getLowerCase(String str) {
+        return str == null ? null : str.toLowerCase();
+    }
+
+    private boolean stringMismatch(String str1, String str2) {
+        if (str1 == null && str2 == null) return false;
+        if ((str1 == null) != (str2 == null)) return true;
+
+        return !str1.equals(str2);
+    }
+}

app/src/main/java/us/shandian/giga/postprocessing/M4aNoDash.java

@@ -0,0 +1,41 @@
+package us.shandian.giga.postprocessing;
+
+import org.schabi.newpipe.streams.Mp4DashReader;
+import org.schabi.newpipe.streams.Mp4FromDashWriter;
+import org.schabi.newpipe.streams.io.SharpStream;
+
+import java.io.IOException;
+
+class M4aNoDash extends Postprocessing {
+
+    M4aNoDash() {
+        super(false, true, ALGORITHM_M4A_NO_DASH);
+    }
+
+    @Override
+    boolean test(SharpStream... sources) throws IOException {
+        // check if the mp4 file is DASH (youtube)
+
+        Mp4DashReader reader = new Mp4DashReader(sources[0]);
+        reader.parse();
+
+        switch (reader.getBrands()[0]) {
+            case 0x64617368:// DASH
+            case 0x69736F35:// ISO5
+                return true;
+            default:
+                return false;
+        }
+    }
+
+    @Override
+    int process(SharpStream out, SharpStream... sources) throws IOException {
+        Mp4FromDashWriter muxer = new Mp4FromDashWriter(sources[0]);
+        muxer.setMainBrand(0x4D344120);// binary string "M4A "
+        muxer.parseSources();
+        muxer.selectTracks(0);
+        muxer.build(out);
+
+        return OK_RESULT;
+    }
+}

app/src/main/java/us/shandian/giga/postprocessing/Mp4FromDashMuxer.java

@@ -1,29 +1,27 @@
-package us.shandian.giga.postprocessing;
+package us.shandian.giga.postprocessing;
-
+
-import org.schabi.newpipe.streams.Mp4DashWriter;
+import org.schabi.newpipe.streams.Mp4FromDashWriter;
-import org.schabi.newpipe.streams.io.SharpStream;
+import org.schabi.newpipe.streams.io.SharpStream;
-
+
-import java.io.IOException;
+import java.io.IOException;
-
+
-import us.shandian.giga.get.DownloadMission;
+/**
-
+ * @author kapodamy
-/**
+ */
- * @author kapodamy
+class Mp4FromDashMuxer extends Postprocessing {
- */
+
-class Mp4DashMuxer extends Postprocessing {
+    Mp4FromDashMuxer() {
-
+        super(true, true, ALGORITHM_MP4_FROM_DASH_MUXER);
-    Mp4DashMuxer(DownloadMission mission) {
+    }
-        super(mission, 15360 * 1024/* 15 MiB */, true);
+
-    }
+    @Override
-
+    int process(SharpStream out, SharpStream... sources) throws IOException {
-    @Override
+        Mp4FromDashWriter muxer = new Mp4FromDashWriter(sources);
-    int process(SharpStream out, SharpStream... sources) throws IOException {
+        muxer.parseSources();
-        Mp4DashWriter muxer = new Mp4DashWriter(sources);
+        muxer.selectTracks(0, 0);
-        muxer.parseSources();
+        muxer.build(out);
-        muxer.selectTracks(0, 0);
+
-        muxer.build(out);
+        return OK_RESULT;
-
+    }
-        return OK_RESULT;
+
-    }
+}
-
-}

app/src/main/java/us/shandian/giga/postprocessing/Mp4Muxer.java

@@ -1,136 +0,0 @@
-package us.shandian.giga.postprocessing;
-
-import android.media.MediaCodec.BufferInfo;
-import android.media.MediaExtractor;
-import android.media.MediaMuxer;
-import android.media.MediaMuxer.OutputFormat;
-import android.util.Log;
-
-import static org.schabi.newpipe.BuildConfig.DEBUG;
-
-import org.schabi.newpipe.streams.io.SharpStream;
-
-import java.io.File;
-import java.io.FileInputStream;
-import java.io.IOException;
-import java.nio.ByteBuffer;
-
-import us.shandian.giga.get.DownloadMission;
-
-
-class Mp4Muxer extends Postprocessing {
-    private static final String TAG = "Mp4Muxer";
-    private static final int NOTIFY_BYTES_INTERVAL = 128 * 1024;// 128 KiB
-
-    Mp4Muxer(DownloadMission mission) {
-        super(mission, 0, false);
-    }
-
-    @Override
-    int process(SharpStream out, SharpStream... sources) throws IOException {
-        File dlFile = mission.getDownloadedFile();
-        File tmpFile = new File(mission.location, mission.name.concat(".tmp"));
-
-        if (tmpFile.exists())
-            if (!tmpFile.delete()) return DownloadMission.ERROR_FILE_CREATION;
-
-        if (!tmpFile.createNewFile()) return DownloadMission.ERROR_FILE_CREATION;
-
-        FileInputStream source = null;
-        MediaMuxer muxer = null;
-
-        //noinspection TryFinallyCanBeTryWithResources
-        try {
-            source = new FileInputStream(dlFile);
-            MediaExtractor tracks[] = {
-                    getMediaExtractor(source, mission.offsets[0], mission.offsets[1] - mission.offsets[0]),
-                    getMediaExtractor(source, mission.offsets[1], mission.length - mission.offsets[1])
-            };
-
-            muxer = new MediaMuxer(tmpFile.getAbsolutePath(), OutputFormat.MUXER_OUTPUT_MPEG_4);
-
-            int tracksIndex[] = {
-                    muxer.addTrack(tracks[0].getTrackFormat(0)),
-                    muxer.addTrack(tracks[1].getTrackFormat(0))
-            };
-
-            ByteBuffer buffer = ByteBuffer.allocate(512 * 1024);// 512 KiB
-            BufferInfo info = new BufferInfo();
-
-            long written = 0;
-            long nextReport = NOTIFY_BYTES_INTERVAL;
-
-            muxer.start();
-
-            while (true) {
-                int done = 0;
-
-                for (int i = 0; i < tracks.length; i++) {
-                    if (tracksIndex[i] < 0) continue;
-
-                    info.set(0,
-                            tracks[i].readSampleData(buffer, 0),
-                            tracks[i].getSampleTime(),
-                            tracks[i].getSampleFlags()
-                    );
-
-                    if (info.size >= 0) {
-                        muxer.writeSampleData(tracksIndex[i], buffer, info);
-                        written += info.size;
-                        done++;
-                    }
-                    if (!tracks[i].advance()) {
-                        // EOF reached
-                        tracks[i].release();
-                        tracksIndex[i] = -1;
-                    }
-
-                    if (written > nextReport) {
-                        nextReport = written + NOTIFY_BYTES_INTERVAL;
-                        super.progressReport(written);
-                    }
-                }
-
-                if (done < 1) break;
-            }
-
-            // this part should not fail
-            if (!dlFile.delete()) return DownloadMission.ERROR_FILE_CREATION;
-            if (!tmpFile.renameTo(dlFile)) return DownloadMission.ERROR_FILE_CREATION;
-
-            return OK_RESULT;
-        } finally {
-            try {
-                if (muxer != null) {
-                    muxer.stop();
-                    muxer.release();
-                }
-            } catch (Exception err) {
-                if (DEBUG)
-                    Log.e(TAG, "muxer stop/release failed", err);
-            }
-
-            if (source != null) {
-                try {
-                    source.close();
-                } catch (IOException e) {
-                    // nothing to do
-                }
-            }
-
-            // if the operation fails, delete the temporal file
-            if (tmpFile.exists()) {
-                //noinspection ResultOfMethodCallIgnored
-                tmpFile.delete();
-            }
-        }
-    }
-
-    private MediaExtractor getMediaExtractor(FileInputStream source, long offset, long length) throws IOException {
-        MediaExtractor extractor = new MediaExtractor();
-        extractor.setDataSource(source.getFD(), offset, length);
-        extractor.selectTrack(0);
-
-        return extractor;
-    }
-}

app/src/main/java/us/shandian/giga/postprocessing/Postprocessing.java

@@ -1,164 +1,256 @@
-package us.shandian.giga.postprocessing;
+package us.shandian.giga.postprocessing;
-
+
-import android.os.Message;
+import android.os.Message;
-
+import android.support.annotation.NonNull;
-import org.schabi.newpipe.streams.io.SharpStream;
+import android.util.Log;
-
+
-import java.io.File;
+import org.schabi.newpipe.streams.io.SharpStream;
-import java.io.IOException;
+
-
+import java.io.File;
-import us.shandian.giga.get.DownloadMission;
+import java.io.IOException;
-import us.shandian.giga.postprocessing.io.ChunkFileInputStream;
+import java.io.Serializable;
-import us.shandian.giga.postprocessing.io.CircularFile;
+
-import us.shandian.giga.service.DownloadManagerService;
+import us.shandian.giga.get.DownloadMission;
-
+import us.shandian.giga.io.ChunkFileInputStream;
-public abstract class Postprocessing {
+import us.shandian.giga.io.CircularFileWriter;
-
+import us.shandian.giga.io.CircularFileWriter.OffsetChecker;
-    static final byte OK_RESULT = DownloadMission.ERROR_NOTHING;
+import us.shandian.giga.service.DownloadManagerService;
-
+
-    public static final String ALGORITHM_TTML_CONVERTER = "ttml";
+import static us.shandian.giga.get.DownloadMission.ERROR_NOTHING;
-    public static final String ALGORITHM_MP4_DASH_MUXER = "mp4D";
+import static us.shandian.giga.get.DownloadMission.ERROR_POSTPROCESSING_HOLD;
-    public static final String ALGORITHM_MP4_MUXER = "mp4";
+import static us.shandian.giga.get.DownloadMission.ERROR_UNKNOWN_EXCEPTION;
-    public static final String ALGORITHM_WEBM_MUXER = "webm";
+
-
+public abstract class Postprocessing implements Serializable {
-    public static Postprocessing getAlgorithm(String algorithmName, DownloadMission mission) {
+
-        if (null == algorithmName) {
+    static transient final byte OK_RESULT = ERROR_NOTHING;
-            throw new NullPointerException("algorithmName");
+
-        } else switch (algorithmName) {
+    public transient static final String ALGORITHM_TTML_CONVERTER = "ttml";
-            case ALGORITHM_TTML_CONVERTER:
+    public transient static final String ALGORITHM_WEBM_MUXER = "webm";
-                return new TtmlConverter(mission);
+    public transient static final String ALGORITHM_MP4_FROM_DASH_MUXER = "mp4D-mp4";
-            case ALGORITHM_MP4_DASH_MUXER:
+    public transient static final String ALGORITHM_M4A_NO_DASH = "mp4D-m4a";
-                return new Mp4DashMuxer(mission);
+
-            case ALGORITHM_MP4_MUXER:
+    public static Postprocessing getAlgorithm(@NonNull String algorithmName, String[] args) {
-                return new Mp4Muxer(mission);
+        Postprocessing instance;
-            case ALGORITHM_WEBM_MUXER:
+
-                return new WebMMuxer(mission);
+        switch (algorithmName) {
-            /*case "example-algorithm":
+            case ALGORITHM_TTML_CONVERTER:
-            return new ExampleAlgorithm(mission);*/
+                instance = new TtmlConverter();
-            default:
+                break;
-                throw new RuntimeException("Unimplemented post-processing algorithm: " + algorithmName);
+            case ALGORITHM_WEBM_MUXER:
-        }
+                instance = new WebMMuxer();
-    }
+                break;
-
+            case ALGORITHM_MP4_FROM_DASH_MUXER:
-    /**
+                instance = new Mp4FromDashMuxer();
-     * Get a boolean value that indicate if the given algorithm work on the same
+                break;
-     * file
+            case ALGORITHM_M4A_NO_DASH:
-     */
+                instance = new M4aNoDash();
-    public boolean worksOnSameFile;
+                break;
-
+            /*case "example-algorithm":
-    /**
+                instance = new ExampleAlgorithm();*/
-     * Get the recommended space to reserve for the given algorithm. The amount
+            default:
-     * is in bytes
+                throw new UnsupportedOperationException("Unimplemented post-processing algorithm: " + algorithmName);
-     */
+        }
-    public int recommendedReserve;
+
-
+        instance.args = args;
-    /**
+        return instance;
-     * the download to post-process
+    }
-     */
+
-    protected DownloadMission mission;
+    /**
-
+     * Get a boolean value that indicate if the given algorithm work on the same
-    Postprocessing(DownloadMission mission, int recommendedReserve, boolean worksOnSameFile) {
+     * file
-        this.mission = mission;
+     */
-        this.recommendedReserve = recommendedReserve;
+    public final boolean worksOnSameFile;
-        this.worksOnSameFile = worksOnSameFile;
+
-    }
+    /**
-
+     * Indicates whether the selected algorithm needs space reserved at the beginning of the file
-    public void run() throws IOException {
+     */
-        File file = mission.getDownloadedFile();
+    public final boolean reserveSpace;
-        CircularFile out = null;
+
-        int result;
+    /**
-        long finalLength = -1;
+     * Gets the given algorithm short name
-
+     */
-        mission.done = 0;
+    private final String name;
-        mission.length = file.length();
+
-
+
-        if (worksOnSameFile) {
+    private String[] args;
-            ChunkFileInputStream[] sources = new ChunkFileInputStream[mission.urls.length];
+
-            try {
+    protected transient DownloadMission mission;
-                int i = 0;
+
-                for (; i < sources.length - 1; i++) {
+    private File tempFile;
-                    sources[i] = new ChunkFileInputStream(file, mission.offsets[i], mission.offsets[i + 1], "rw");
+
-                }
+    Postprocessing(boolean reserveSpace, boolean worksOnSameFile, String algorithmName) {
-                sources[i] = new ChunkFileInputStream(file, mission.offsets[i], mission.getDownloadedFile().length(), "rw");
+        this.reserveSpace = reserveSpace;
-
+        this.worksOnSameFile = worksOnSameFile;
-                int[] idx = {0};
+        this.name = algorithmName;// for debugging only
-                CircularFile.OffsetChecker checker = () -> {
+    }
-                    while (idx[0] < sources.length) {
+
-                        /*
+    public void setTemporalDir(@NonNull File directory) {
-                         * WARNING: never use rewind() in any chunk after any writing (especially on first chunks)
+        long rnd = (int) (Math.random() * 100000f);
-                         *          or the CircularFile can lead to unexpected results
+        tempFile = new File(directory, rnd + "_" + System.nanoTime() + ".tmp");
-                         */
+    }
-                        if (sources[idx[0]].isDisposed() || sources[idx[0]].available() < 1) {
+
-                            idx[0]++;
+    public void cleanupTemporalDir() {
-                            continue;// the selected source is not used anymore
+        if (tempFile != null && tempFile.exists()) {
-                        }
+            //noinspection ResultOfMethodCallIgnored
-
+            tempFile.delete();
-                        return sources[idx[0]].getFilePointer() - 1;
+        }
-                    }
+    }
-
+
-                    return -1;
+
-                };
+    public void run(DownloadMission target) throws IOException {
-                out = new CircularFile(file, 0, this::progressReport, checker);
+        this.mission = target;
-
+
-                result = process(out, sources);
+        CircularFileWriter out = null;
-
+        int result;
-                if (result == OK_RESULT)
+        long finalLength = -1;
-                    finalLength = out.finalizeFile();
+
-            } finally {
+        mission.done = 0;
-                for (SharpStream source : sources) {
+        mission.length = mission.storage.length();
-                    if (source != null && !source.isDisposed()) {
+
-                        source.dispose();
+        if (worksOnSameFile) {
-                    }
+            ChunkFileInputStream[] sources = new ChunkFileInputStream[mission.urls.length];
-                }
+            try {
-                if (out != null) {
+                int i = 0;
-                    out.dispose();
+                for (; i < sources.length - 1; i++) {
-                }
+                    sources[i] = new ChunkFileInputStream(mission.storage.getStream(), mission.offsets[i], mission.offsets[i + 1]);
-            }
+                }
-        } else {
+                sources[i] = new ChunkFileInputStream(mission.storage.getStream(), mission.offsets[i]);
-            result = process(null);
+
-        }
+                if (test(sources)) {
-
+                    for (SharpStream source : sources) source.rewind();
-        if (result == OK_RESULT) {
+
-            if (finalLength < 0) finalLength = file.length();
+                    OffsetChecker checker = () -> {
-            mission.done = finalLength;
+                        for (ChunkFileInputStream source : sources) {
-            mission.length = finalLength;
+                            /*
-        } else {
+                             * WARNING: never use rewind() in any chunk after any writing (especially on first chunks)
-            mission.errCode = DownloadMission.ERROR_UNKNOWN_EXCEPTION;
+                             *          or the CircularFileWriter can lead to unexpected results
-            mission.errObject = new RuntimeException("post-processing algorithm returned " + result);
+                             */
-        }
+                            if (source.isClosed() || source.available() < 1) {
-
+                                continue;// the selected source is not used anymore
-        if (result != OK_RESULT && worksOnSameFile) {
+                            }
-            //noinspection ResultOfMethodCallIgnored
+
-            file.delete();
+                            return source.getFilePointer() - 1;
-        }
+                        }
-    }
+
-
+                        return -1;
-    /**
+                    };
-     * Abstract method to execute the pos-processing algorithm
+
-     *
+                    out = new CircularFileWriter(mission.storage.getStream(), tempFile, checker);
-     * @param out     output stream
+                    out.onProgress = this::progressReport;
-     * @param sources files to be processed
+
-     * @return a error code, 0 means the operation was successful
+                    out.onWriteError = (err) -> {
-     * @throws IOException if an I/O error occurs.
+                        mission.psState = 3;
-     */
+                        mission.notifyError(ERROR_POSTPROCESSING_HOLD, err);
-    abstract int process(SharpStream out, SharpStream... sources) throws IOException;
+
-
+                        try {
-    String getArgumentAt(int index, String defaultValue) {
+                            synchronized (this) {
-        if (mission.postprocessingArgs == null || index >= mission.postprocessingArgs.length) {
+                                while (mission.psState == 3)
-            return defaultValue;
+                                    wait();
-        }
+                            }
-
+                        } catch (InterruptedException e) {
-        return mission.postprocessingArgs[index];
+                            // nothing to do
-    }
+                            Log.e(this.getClass().getSimpleName(), "got InterruptedException");
-
+                        }
-    void progressReport(long done) {
+
-        mission.done = done;
+                        return mission.errCode == ERROR_NOTHING;
-        if (mission.length < mission.done) mission.length = mission.done;
+                    };
-
+
-        Message m = new Message();
+                    result = process(out, sources);
-        m.what = DownloadManagerService.MESSAGE_PROGRESS;
+
-        m.obj = mission;
+                    if (result == OK_RESULT)
-
+                        finalLength = out.finalizeFile();
-        mission.mHandler.sendMessage(m);
+                } else {
-    }
+                    result = OK_RESULT;
-}
+                }
+            } finally {
+                for (SharpStream source : sources) {
+                    if (source != null && !source.isClosed()) {
+                        source.close();
+                    }
+                }
+                if (out != null) {
+                    out.close();
+                }
+                if (tempFile != null) {
+                    //noinspection ResultOfMethodCallIgnored
+                    tempFile.delete();
+                    tempFile = null;
+                }
+            }
+        } else {
+            result = test() ? process(null) : OK_RESULT;
+        }
+
+        if (result == OK_RESULT) {
+            if (finalLength != -1) {
+                mission.done = finalLength;
+                mission.length = finalLength;
+            }
+        } else {
+            mission.errCode = ERROR_UNKNOWN_EXCEPTION;
+            mission.errObject = new RuntimeException("post-processing algorithm returned " + result);
+        }
+
+        if (result != OK_RESULT && worksOnSameFile) mission.storage.delete();
+
+        this.mission = null;
+    }
+
+    /**
+     * Test if the post-processing algorithm can be skipped
+     *
+     * @param sources files to be processed
+     * @return {@code true} if the post-processing is required, otherwise, {@code false}
+     * @throws IOException if an I/O error occurs.
+     */
+    boolean test(SharpStream... sources) throws IOException {
+        return true;
+    }
+
+    /**
+     * Abstract method to execute the post-processing algorithm
+     *
+     * @param out     output stream
+     * @param sources files to be processed
+     * @return a error code, 0 means the operation was successful
+     * @throws IOException if an I/O error occurs.
+     */
+    abstract int process(SharpStream out, SharpStream... sources) throws IOException;
+
+    String getArgumentAt(int index, String defaultValue) {
+        if (args == null || index >= args.length) {
+            return defaultValue;
+        }
+
+        return args[index];
+    }
+
+    private void progressReport(long done) {
+        mission.done = done;
+        if (mission.length < mission.done) mission.length = mission.done;
+
+        Message m = new Message();
+        m.what = DownloadManagerService.MESSAGE_PROGRESS;
+        m.obj = mission;
+
+        mission.mHandler.sendMessage(m);
+    }
+
+    @NonNull
+    @Override
+    public String toString() {
+        StringBuilder str = new StringBuilder();
+
+        str.append("name=").append(name).append('[');
+
+        if (args != null) {
+            for (String arg : args) {
+                str.append(", ");
+                str.append(arg);
+            }
+            str.delete(0, 1);
+        }
+
+        return str.append(']').toString();
+    }
+}

app/src/main/java/us/shandian/giga/postprocessing/TtmlConverter.java

@@ -1,75 +1,72 @@
-package us.shandian.giga.postprocessing;
+package us.shandian.giga.postprocessing;
-
+
-import android.util.Log;
+import android.util.Log;
-
+
-import org.schabi.newpipe.streams.io.SharpStream;
+import org.schabi.newpipe.streams.SubtitleConverter;
-import org.schabi.newpipe.streams.SubtitleConverter;
+import org.schabi.newpipe.streams.io.SharpStream;
-import org.xml.sax.SAXException;
+import org.xml.sax.SAXException;
-
+
-import java.io.IOException;
+import java.io.IOException;
-import java.text.ParseException;
+import java.text.ParseException;
-
+
-import javax.xml.parsers.ParserConfigurationException;
+import javax.xml.parsers.ParserConfigurationException;
-import javax.xml.xpath.XPathExpressionException;
+import javax.xml.xpath.XPathExpressionException;
-
+
-import us.shandian.giga.get.DownloadMission;
+/**
-import us.shandian.giga.postprocessing.io.SharpInputStream;
+ * @author kapodamy
-
+ */
-/**
+class TtmlConverter extends Postprocessing {
- * @author kapodamy
+    private static final String TAG = "TtmlConverter";
- */
+
-class TtmlConverter extends Postprocessing {
+    TtmlConverter() {
-    private static final String TAG = "TtmlConverter";
+        // due how XmlPullParser works, the xml is fully loaded on the ram
-
+        super(false, true, ALGORITHM_TTML_CONVERTER);
-    TtmlConverter(DownloadMission mission) {
+    }
-        // due how XmlPullParser works, the xml is fully loaded on the ram
+
-        super(mission, 0, true);
+    @Override
-    }
+    int process(SharpStream out, SharpStream... sources) throws IOException {
-
+        // check if the subtitle is already in srt and copy, this should never happen
-    @Override
+        String format = getArgumentAt(0, null);
-    int process(SharpStream out, SharpStream... sources) throws IOException {
+
-        // check if the subtitle is already in srt and copy, this should never happen
+        if (format == null || format.equals("ttml")) {
-        String format = getArgumentAt(0, null);
+            SubtitleConverter ttmlDumper = new SubtitleConverter();
-
+
-        if (format == null || format.equals("ttml")) {
+            try {
-            SubtitleConverter ttmlDumper = new SubtitleConverter();
+                ttmlDumper.dumpTTML(
-
+                        sources[0],
-            try {
+                        out,
-                ttmlDumper.dumpTTML(
+                        getArgumentAt(1, "true").equals("true"),
-                        sources[0],
+                        getArgumentAt(2, "true").equals("true")
-                        out,
+                );
-                        getArgumentAt(1, "true").equals("true"),
+            } catch (Exception err) {
-                        getArgumentAt(2, "true").equals("true")
+                Log.e(TAG, "subtitle parse failed", err);
-                );
+
-            } catch (Exception err) {
+                if (err instanceof IOException) {
-                Log.e(TAG, "subtitle parse failed", err);
+                    return 1;
-
+                } else if (err instanceof ParseException) {
-                if (err instanceof IOException) {
+                    return 2;
-                    return 1;
+                } else if (err instanceof SAXException) {
-                } else if (err instanceof ParseException) {
+                    return 3;
-                    return 2;
+                } else if (err instanceof ParserConfigurationException) {
-                } else if (err instanceof SAXException) {
+                    return 4;
-                    return 3;
+                } else if (err instanceof XPathExpressionException) {
-                } else if (err instanceof ParserConfigurationException) {
+                    return 7;
-                    return 4;
+                }
-                } else if (err instanceof XPathExpressionException) {
+
-                    return 7;
+                return 8;
-                }
+            }
-
+
-                return 8;
+            return OK_RESULT;
-            }
+        } else if (format.equals("srt")) {
-
+            byte[] buffer = new byte[8 * 1024];
-            return OK_RESULT;
+            int read;
-        } else if (format.equals("srt")) {
+            while ((read = sources[0].read(buffer)) > 0) {
-            byte[] buffer = new byte[8 * 1024];
+                out.write(buffer, 0, read);
-            int read;
+            }
-            while ((read = sources[0].read(buffer)) > 0) {
+            return OK_RESULT;
-                out.write(buffer, 0, read);
+        }
-            }
+
-            return OK_RESULT;
+        throw new UnsupportedOperationException("Can't convert this subtitle, unimplemented format: " + format);
-        }
+    }
-
+
-        throw new UnsupportedOperationException("Can't convert this subtitle, unimplemented format: " + format);
+}
-    }
-
-}

app/src/main/java/us/shandian/giga/postprocessing/WebMMuxer.java

@@ -1,42 +1,44 @@
-package us.shandian.giga.postprocessing;
+package us.shandian.giga.postprocessing;
-
+
-import org.schabi.newpipe.streams.WebMReader.TrackKind;
+import org.schabi.newpipe.streams.WebMReader.TrackKind;
-import org.schabi.newpipe.streams.WebMReader.WebMTrack;
+import org.schabi.newpipe.streams.WebMReader.WebMTrack;
-import org.schabi.newpipe.streams.WebMWriter;
+import org.schabi.newpipe.streams.WebMWriter;
-import org.schabi.newpipe.streams.io.SharpStream;
+import org.schabi.newpipe.streams.io.SharpStream;
-
+
-import java.io.IOException;
+import java.io.IOException;
-
+
-import us.shandian.giga.get.DownloadMission;
+/**
-
+ * @author kapodamy
-/**
+ */
- * @author kapodamy
+class WebMMuxer extends Postprocessing {
- */
+
-class WebMMuxer extends Postprocessing {
+    WebMMuxer() {
-
+        super(true, true, ALGORITHM_WEBM_MUXER);
-    WebMMuxer(DownloadMission mission) {
+    }
-        super(mission, 2048 * 1024/* 2 MiB */, true);
+
-    }
+    @Override
-
+    int process(SharpStream out, SharpStream... sources) throws IOException {
-    @Override
+        WebMWriter muxer = new WebMWriter(sources);
-    int process(SharpStream out, SharpStream... sources) throws IOException {
+        muxer.parseSources();
-        WebMWriter muxer = new WebMWriter(sources);
+
-        muxer.parseSources();
+        // youtube uses a webm with a fake video track that acts as a "cover image"
-
+        int[] indexes = new int[sources.length];
-        // youtube uses a webm with a fake video track that acts as a "cover image"
+
-        WebMTrack[] tracks = muxer.getTracksFromSource(1);
+        for (int i = 0; i < sources.length; i++) {
-        int audioTrackIndex = 0;
+            WebMTrack[] tracks = muxer.getTracksFromSource(i);
-        for (int i = 0; i < tracks.length; i++) {
+            for (int j = 0; j < tracks.length; j++) {
-            if (tracks[i].kind == TrackKind.Audio) {
+                if (tracks[j].kind == TrackKind.Audio) {
-                audioTrackIndex = i;
+                    indexes[i] = j;
-                break;
+                    i = sources.length;
-            }
+                    break;
-        }
+                }
-
+            }
-        muxer.selectTracks(0, audioTrackIndex);
+        }
-        muxer.build(out);
+
-
+        muxer.selectTracks(indexes);
-        return OK_RESULT;
+        muxer.build(out);
-    }
+
-
+        return OK_RESULT;
-}
+    }
+
+}

app/src/main/java/us/shandian/giga/postprocessing/io/CircularFile.java

@@ -1,375 +0,0 @@
-package us.shandian.giga.postprocessing.io;
-
-import org.schabi.newpipe.streams.io.SharpStream;
-
-import java.io.File;
-import java.io.IOException;
-import java.io.RandomAccessFile;
-import java.util.ArrayList;
-
-public class CircularFile extends SharpStream {
-
-    private final static int AUX_BUFFER_SIZE = 1024 * 1024;// 1 MiB
-    private final static int AUX_BUFFER_SIZE2 = 512 * 1024;// 512 KiB
-    private final static int NOTIFY_BYTES_INTERVAL = 64 * 1024;// 64 KiB
-    private final static int QUEUE_BUFFER_SIZE = 8 * 1024;// 8 KiB
-    private final static boolean IMMEDIATE_AUX_BUFFER_FLUSH = false;
-
-    private RandomAccessFile out;
-    private long position;
-    private long maxLengthKnown = -1;
-
-    private ArrayList<ManagedBuffer> auxiliaryBuffers;
-    private OffsetChecker callback;
-    private ManagedBuffer queue;
-    private long startOffset;
-    private ProgressReport onProgress;
-    private long reportPosition;
-
-    public CircularFile(File file, long offset, ProgressReport progressReport, OffsetChecker checker) throws IOException {
-        if (checker == null) {
-            throw new NullPointerException("checker is null");
-        }
-
-        try {
-            queue = new ManagedBuffer(QUEUE_BUFFER_SIZE);
-            out = new RandomAccessFile(file, "rw");
-            out.seek(offset);
-            position = offset;
-        } catch (IOException err) {
-            try {
-                if (out != null) {
-                    out.close();
-                }
-            } catch (IOException e) {
-                // nothing to do
-            }
-            throw err;
-        }
-
-        auxiliaryBuffers = new ArrayList<>(15);
-        callback = checker;
-        startOffset = offset;
-        reportPosition = offset;
-        onProgress = progressReport;
-
-    }
-
-    /**
-     * Close the file without flushing any buffer
-     */
-    @Override
-    public void dispose() {
-        try {
-            auxiliaryBuffers = null;
-            if (out != null) {
-                out.close();
-                out = null;
-            }
-        } catch (IOException err) {
-            // nothing to do
-        }
-    }
-
-    /**
-     * Flush any buffer and close the output file. Use this method if the
-     * operation is successful
-     *
-     * @return the final length of the file
-     * @throws IOException if an I/O error occurs
-     */
-    public long finalizeFile() throws IOException {
-        flushEverything();
-
-        if (maxLengthKnown > -1) {
-            position = maxLengthKnown;
-        }
-        if (position < out.length()) {
-            out.setLength(position);
-        }
-
-        dispose();
-
-        return position;
-    }
-
-    @Override
-    public void write(byte b) throws IOException {
-        write(new byte[]{b}, 0, 1);
-    }
-
-    @Override
-    public void write(byte b[]) throws IOException {
-        write(b, 0, b.length);
-    }
-
-    @Override
-    public void write(byte b[], int off, int len) throws IOException {
-        if (len == 0) {
-            return;
-        }
-
-        long end = callback.check();
-        long available;
-
-        if (end == -1) {
-            available = Long.MAX_VALUE;
-        } else {
-            if (end < startOffset) {
-                throw new IOException("The reported offset is invalid. reported offset is " + String.valueOf(end));
-            }
-            available = end - position;
-        }
-
-        // Check if possible flush one or more auxiliary buffer
-        if (auxiliaryBuffers.size() > 0) {
-            ManagedBuffer aux = auxiliaryBuffers.get(0);
-
-            // check if there is enough space to flush it completely
-            while (available >= (aux.size + queue.size)) {
-                available -= aux.size;
-                writeQueue(aux.buffer, 0, aux.size);
-                aux.dereference();
-                auxiliaryBuffers.remove(0);
-
-                if (auxiliaryBuffers.size() < 1) {
-                    aux = null;
-                    break;
-                }
-                aux = auxiliaryBuffers.get(0);
-            }
-
-            if (IMMEDIATE_AUX_BUFFER_FLUSH) {
-                // try partial flush to avoid allocate another auxiliary buffer
-                if (aux != null && aux.available() < len && available > queue.size) {
-                    int size = Math.min(aux.size, (int) available - queue.size);
-
-                    writeQueue(aux.buffer, 0, size);
-                    aux.dereference(size);
-
-                    available -= size;
-                }
-            }
-        }
-
-        if (auxiliaryBuffers.size() < 1 && available > (len + queue.size)) {
-            writeQueue(b, off, len);
-        } else {
-            int i = auxiliaryBuffers.size() - 1;
-            while (len > 0) {
-                if (i < 0) {
-                    // allocate a new auxiliary buffer
-                    auxiliaryBuffers.add(new ManagedBuffer(AUX_BUFFER_SIZE));
-                    i++;
-                }
-
-                ManagedBuffer aux = auxiliaryBuffers.get(i);
-                available = aux.available();
-
-                if (available < 1) {
-                    // secondary auxiliary buffer
-                    available = len;
-                    aux = new ManagedBuffer(Math.max(len, AUX_BUFFER_SIZE2));
-                    auxiliaryBuffers.add(aux);
-                    i++;
-                } else {
-                    available = Math.min(len, available);
-                }
-
-                aux.write(b, off, (int) available);
-
-                len -= available;
-                if (len > 0) off += available;
-            }
-        }
-    }
-
-    private void writeOutside(byte buffer[], int offset, int length) throws IOException {
-        out.write(buffer, offset, length);
-        position += length;
-
-        if (onProgress != null && position > reportPosition) {
-            reportPosition = position + NOTIFY_BYTES_INTERVAL;
-            onProgress.report(position);
-        }
-    }
-
-    private void writeQueue(byte[] buffer, int offset, int length) throws IOException {
-        while (length > 0) {
-            if (queue.available() < length) {
-                flushQueue();
-
-                if (length >= queue.buffer.length) {
-                    writeOutside(buffer, offset, length);
-                    return;
-                }
-            }
-
-            int size = Math.min(queue.available(), length);
-            queue.write(buffer, offset, size);
-
-            offset += size;
-            length -= size;
-        }
-
-        if (queue.size >= queue.buffer.length) {
-            flushQueue();
-        }
-    }
-
-    private void flushQueue() throws IOException {
-        writeOutside(queue.buffer, 0, queue.size);
-        queue.size = 0;
-    }
-
-    private void flushEverything() throws IOException {
-        flushQueue();
-
-        if (auxiliaryBuffers.size() > 0) {
-            for (ManagedBuffer aux : auxiliaryBuffers) {
-                writeOutside(aux.buffer, 0, aux.size);
-                aux.dereference();
-            }
-            auxiliaryBuffers.clear();
-        }
-    }
-
-    /**
-     * Flush any buffer directly to the file. Warning: use this method ONLY if
-     * all read dependencies are disposed
-     *
-     * @throws IOException if the dependencies are not disposed
-     */
-    @Override
-    public void flush() throws IOException {
-        if (callback.check() != -1) {
-            throw new IOException("All read dependencies of this file must be disposed first");
-        }
-        flushEverything();
-
-        // Save the current file length in case the method {@code rewind()} is called
-        if (position > maxLengthKnown) {
-            maxLengthKnown = position;
-        }
-    }
-
-    @Override
-    public void rewind() throws IOException {
-        flush();
-        out.seek(startOffset);
-
-        if (onProgress != null) {
-            onProgress.report(-position);
-        }
-
-        position = startOffset;
-        reportPosition = startOffset;
-
-    }
-
-    @Override
-    public long skip(long amount) throws IOException {
-        flush();
-        position += amount;
-
-        out.seek(position);
-
-        return amount;
-    }
-
-    @Override
-    public boolean isDisposed() {
-        return out == null;
-    }
-
-    @Override
-    public boolean canRewind() {
-        return true;
-    }
-
-    @Override
-    public boolean canWrite() {
-        return true;
-    }
-
-    //<editor-fold defaultState="collapsed" desc="stub read methods">
-    @Override
-    public boolean canRead() {
-        return false;
-    }
-
-    @Override
-    public int read() {
-        throw new UnsupportedOperationException("write-only");
-    }
-
-    @Override
-    public int read(byte[] buffer) {
-        throw new UnsupportedOperationException("write-only");
-    }
-
-    @Override
-    public int read(byte[] buffer, int offset, int count) {
-        throw new UnsupportedOperationException("write-only");
-    }
-
-    @Override
-    public int available() {
-        throw new UnsupportedOperationException("write-only");
-    }
-//</editor-fold>
-
-    public interface OffsetChecker {
-
-        /**
-         * Checks the amount of available space ahead
-         *
-         * @return absolute offset in the file where no more data SHOULD NOT be
-         * written. If the value is -1 the whole file will be used
-         */
-        long check();
-    }
-
-    public interface ProgressReport {
-
-        void report(long progress);
-    }
-
-    class ManagedBuffer {
-
-        byte[] buffer;
-        int size;
-
-        ManagedBuffer(int length) {
-            buffer = new byte[length];
-        }
-
-        void dereference() {
-            buffer = null;
-            size = 0;
-        }
-
-        void dereference(int amount) {
-            if (amount > size) {
-                throw new IndexOutOfBoundsException("Invalid dereference amount (" + amount + ">=" + size + ")");
-            }
-            size -= amount;
-            System.arraycopy(buffer, amount, buffer, 0, size);
-        }
-
-        protected int available() {
-            return buffer.length - size;
-        }
-
-        private void write(byte[] b, int off, int len) {
-            System.arraycopy(b, off, buffer, size, len);
-            size += len;
-        }
-
-        @Override
-        public String toString() {
-            return "holding: " + String.valueOf(size) + " length: " + String.valueOf(buffer.length) + " available: " + String.valueOf(available());
-        }
-
-    }
-}

app/src/main/java/us/shandian/giga/service/DownloadManager.java

@@ -13,14 +13,15 @@ import org.schabi.newpipe.R;
 import java.io.File;
 import java.io.IOException;
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.Collections;
 import java.util.Iterator;
 
 import us.shandian.giga.get.DownloadMission;
 import us.shandian.giga.get.FinishedMission;
 import us.shandian.giga.get.Mission;
-import us.shandian.giga.get.sqlite.DownloadDataSource;
+import us.shandian.giga.get.sqlite.FinishedMissionStore;
+import us.shandian.giga.io.StoredDirectoryHelper;
+import us.shandian.giga.io.StoredFileHelper;
 import us.shandian.giga.util.Utility;
 
 import static org.schabi.newpipe.BuildConfig.DEBUG;
@@ -28,13 +29,16 @@ import static org.schabi.newpipe.BuildConfig.DEBUG;
 public class DownloadManager {
     private static final String TAG = DownloadManager.class.getSimpleName();
 
-    enum NetworkState {Unavailable, WifiOperating, MobileOperating, OtherOperating}
+    enum NetworkState {Unavailable, Operating, MeteredOperating}
 
     public final static int SPECIAL_NOTHING = 0;
     public final static int SPECIAL_PENDING = 1;
     public final static int SPECIAL_FINISHED = 2;
 
-    private final DownloadDataSource mDownloadDataSource;
+    static final String TAG_AUDIO = "audio";
+    static final String TAG_VIDEO = "video";
+
+    private final FinishedMissionStore mFinishedMissionStore;
 
     private final ArrayList<DownloadMission> mMissionsPending = new ArrayList<>();
     private final ArrayList<FinishedMission> mMissionsFinished;
@@ -45,7 +49,12 @@ public class DownloadManager {
     private NetworkState mLastNetworkStatus = NetworkState.Unavailable;
 
     int mPrefMaxRetry;
-    boolean mPrefCrossNetwork;
+    boolean mPrefMeteredDownloads;
+    boolean mPrefQueueLimit;
+    private boolean mSelfMissionsControl;
+
+    StoredDirectoryHelper mMainStorageAudio;
+    StoredDirectoryHelper mMainStorageVideo;
 
     /**
      * Create a new instance
@@ -53,13 +62,15 @@ public class DownloadManager {
      * @param context Context for the data source for finished downloads
      * @param handler Thread required for Messaging
      */
-    DownloadManager(@NonNull Context context, Handler handler) {
+    DownloadManager(@NonNull Context context, Handler handler, StoredDirectoryHelper storageVideo, StoredDirectoryHelper storageAudio) {
         if (DEBUG) {
             Log.d(TAG, "new DownloadManager instance. 0x" + Integer.toHexString(this.hashCode()));
         }
 
-        mDownloadDataSource = new DownloadDataSource(context);
+        mFinishedMissionStore = new FinishedMissionStore(context);
         mHandler = handler;
+        mMainStorageAudio = storageAudio;
+        mMainStorageVideo = storageVideo;
         mMissionsFinished = loadFinishedMissions();
         mPendingMissionsDir = getPendingDir(context);
 
@@ -67,7 +78,7 @@ public class DownloadManager {
             throw new RuntimeException("failed to create pending_downloads in data directory");
         }
 
-        loadPendingMissions();
+        loadPendingMissions(context);
     }
 
     private static File getPendingDir(@NonNull Context context) {
@@ -88,29 +99,24 @@ public class DownloadManager {
      * Loads finished missions from the data source
      */
     private ArrayList<FinishedMission> loadFinishedMissions() {
-        ArrayList<FinishedMission> finishedMissions = mDownloadDataSource.loadFinishedMissions();
+        ArrayList<FinishedMission> finishedMissions = mFinishedMissionStore.loadFinishedMissions();
 
-        // missions always is stored by creation order, simply reverse the list
+        // check if the files exists, otherwise, forget the download
-        ArrayList<FinishedMission> result = new ArrayList<>(finishedMissions.size());
         for (int i = finishedMissions.size() - 1; i >= 0; i--) {
             FinishedMission mission = finishedMissions.get(i);
-            File file = mission.getDownloadedFile();
 
-            if (!file.isFile()) {
+            if (!mission.storage.existsAsFile()) {
-                if (DEBUG) {
+                if (DEBUG) Log.d(TAG, "downloaded file removed: " + mission.storage.getName());
-                    Log.d(TAG, "downloaded file removed: " + file.getAbsolutePath());
+
-                }
+                mFinishedMissionStore.deleteMission(mission);
-                mDownloadDataSource.deleteMission(mission);
+                finishedMissions.remove(i);
-                continue;
             }
-
-            result.add(mission);
         }
 
-        return result;
+        return finishedMissions;
     }
 
-    private void loadPendingMissions() {
+    private void loadPendingMissions(Context ctx) {
         File[] subs = mPendingMissionsDir.listFiles();
 
         if (subs == null) {
@@ -125,109 +131,76 @@ public class DownloadManager {
         }
 
         for (File sub : subs) {
-            if (sub.isFile()) {
+            if (!sub.isFile()) continue;
-                DownloadMission mis = Utility.readFromFile(sub);
 
-                if (mis == null) {
+            DownloadMission mis = Utility.readFromFile(sub);
-                    //noinspection ResultOfMethodCallIgnored
+            if (mis == null || mis.isFinished()) {
-                    sub.delete();
+                //noinspection ResultOfMethodCallIgnored
-                } else {
+                sub.delete();
-                    if (mis.isFinished()) {
+                continue;
-                        //noinspection ResultOfMethodCallIgnored
-                        sub.delete();
-                        continue;
-                    }
-
-                    File dl = mis.getDownloadedFile();
-                    boolean exists = dl.exists();
-
-                    if (mis.isPsRunning()) {
-                        if (mis.postprocessingThis) {
-                            // Incomplete post-processing results in a corrupted download file
-                            // because the selected algorithm works on the same file to save space.
-                            if (exists && dl.isFile() && !dl.delete())
-                                Log.w(TAG, "Unable to delete incomplete download file: " + sub.getPath());
-
-                            exists = true;
-                        }
-
-                        mis.postprocessingState = 0;
-                        mis.errCode = DownloadMission.ERROR_POSTPROCESSING;
-                        mis.errObject = new RuntimeException("stopped unexpectedly");
-                    } else if (exists && !dl.isFile()) {
-                        // probably a folder, this should never happens
-                        if (!sub.delete()) {
-                            Log.w(TAG, "Unable to delete serialized file: " + sub.getPath());
-                        }
-                        continue;
-                    }
-
-                    if (!exists) {
-                        // downloaded file deleted, reset mission state
-                        DownloadMission m = new DownloadMission(mis.urls, mis.name, mis.location, mis.kind, mis.postprocessingName, mis.postprocessingArgs);
-                        m.timestamp = mis.timestamp;
-                        m.threadCount = mis.threadCount;
-                        m.source = mis.source;
-                        m.maxRetry = mis.maxRetry;
-                        m.nearLength = mis.nearLength;
-                        mis = m;
-                    }
-
-                    mis.running = false;
-                    mis.recovered = exists;
-                    mis.metadata = sub;
-                    mis.mHandler = mHandler;
-
-                    mMissionsPending.add(mis);
-                }
             }
+
+            boolean exists;
+            try {
+                mis.storage = StoredFileHelper.deserialize(mis.storage, ctx);
+                exists = !mis.storage.isInvalid() && mis.storage.existsAsFile();
+            } catch (Exception ex) {
+                Log.e(TAG, "Failed to load the file source of " + mis.storage.toString(), ex);
+                mis.storage.invalidate();
+                exists = false;
+            }
+
+            if (mis.isPsRunning()) {
+                if (mis.psAlgorithm.worksOnSameFile) {
+                    // Incomplete post-processing results in a corrupted download file
+                    // because the selected algorithm works on the same file to save space.
+                    // the file will be deleted if the storage API
+                    // is Java IO (avoid showing the "Save as..." dialog)
+                    if (exists && mis.storage.isDirect() && !mis.storage.delete())
+                        Log.w(TAG, "Unable to delete incomplete download file: " + sub.getPath());
+
+                    exists = true;
+                }
+
+                mis.psState = 0;
+                mis.errCode = DownloadMission.ERROR_POSTPROCESSING_STOPPED;
+            } else if (!exists) {
+                tryRecover(mis);
+
+                // the progress is lost, reset mission state
+                if (mis.isInitialized())
+                    mis.resetState(true, true, DownloadMission.ERROR_PROGRESS_LOST);
+            }
+
+            if (mis.psAlgorithm != null) {
+                mis.psAlgorithm.cleanupTemporalDir();
+                mis.psAlgorithm.setTemporalDir(pickAvailableTemporalDir(ctx));
+            }
+
+            mis.recovered = exists;
+            mis.metadata = sub;
+            mis.maxRetry = mPrefMaxRetry;
+            mis.mHandler = mHandler;
+
+            mMissionsPending.add(mis);
         }
 
-        if (mMissionsPending.size() > 1) {
+        if (mMissionsPending.size() > 1)
             Collections.sort(mMissionsPending, (mission1, mission2) -> Long.compare(mission1.timestamp, mission2.timestamp));
-        }
     }
 
     /**
      * Start a new download mission
      *
-     * @param urls     the list of urls to download
+     * @param mission the new download mission to add and run (if possible)
-     * @param location the location
-     * @param name     the name of the file to create
-     * @param kind     type of file (a: audio  v: video  s: subtitle ?: file-extension defined)
-     * @param threads  the number of threads maximal used to download chunks of the file.
-     * @param psName   the name of the required post-processing algorithm, or {@code null} to ignore.
-     * @param source   source url of the resource
-     * @param psArgs   the arguments for the post-processing algorithm.
      */
-    void startMission(String[] urls, String location, String name, char kind, int threads,
+    void startMission(DownloadMission mission) {
-                      String source, String psName, String[] psArgs, long nearLength) {
         synchronized (this) {
-            // check for existing pending download
-            DownloadMission pendingMission = getPendingMission(location, name);
-            if (pendingMission != null) {
-                // generate unique filename (?)
-                try {
-                    name = generateUniqueName(location, name);
-                } catch (Exception e) {
-                    Log.e(TAG, "Unable to generate unique name", e);
-                    name = System.currentTimeMillis() + name;
-                    Log.i(TAG, "Using " + name);
-                }
-            } else {
-                // check for existing finished download
-                int index = getFinishedMissionIndex(location, name);
-                if (index >= 0) mDownloadDataSource.deleteMission(mMissionsFinished.remove(index));
-            }
-
-            DownloadMission mission = new DownloadMission(urls, name, location, kind, psName, psArgs);
             mission.timestamp = System.currentTimeMillis();
-            mission.threadCount = threads;
-            mission.source = source;
             mission.mHandler = mHandler;
             mission.maxRetry = mPrefMaxRetry;
-            mission.nearLength = nearLength;
 
+            // create metadata file
             while (true) {
                 mission.metadata = new File(mPendingMissionsDir, String.valueOf(mission.timestamp));
                 if (!mission.metadata.isFile() && !mission.metadata.exists()) {
@@ -242,14 +215,25 @@ public class DownloadManager {
                 mission.timestamp = System.currentTimeMillis();
             }
 
+            mSelfMissionsControl = true;
             mMissionsPending.add(mission);
 
-            // Before starting, save the state in case the internet connection is not available
+            // Before continue, save the metadata in case the internet connection is not available
             Utility.writeToFile(mission.metadata, mission);
 
-            if (canDownloadInCurrentNetwork() && (getRunningMissionsCount() < 1)) {
+            if (mission.storage == null) {
+                // noting to do here
+                mission.errCode = DownloadMission.ERROR_FILE_CREATION;
+                if (mission.errObject != null)
+                    mission.errObject = new IOException("DownloadMission.storage == NULL");
+                return;
+            }
+
+            boolean start = !mPrefQueueLimit || getRunningMissionsCount() < 1;
+
+            if (canDownloadInCurrentNetwork() && start) {
+                mHandler.sendEmptyMessage(DownloadManagerService.MESSAGE_PROGRESS);
                 mission.start();
-                mHandler.sendEmptyMessage(DownloadManagerService.MESSAGE_RUNNING);
             }
         }
     }
@@ -257,13 +241,14 @@ public class DownloadManager {
 
     public void resumeMission(DownloadMission mission) {
         if (!mission.running) {
+            mHandler.sendEmptyMessage(DownloadManagerService.MESSAGE_PROGRESS);
             mission.start();
-            mHandler.sendEmptyMessage(DownloadManagerService.MESSAGE_RUNNING);
         }
     }
 
     public void pauseMission(DownloadMission mission) {
         if (mission.running) {
+            mission.setEnqueued(false);
             mission.pause();
             mHandler.sendEmptyMessage(DownloadManagerService.MESSAGE_PAUSED);
         }
@@ -275,7 +260,7 @@ public class DownloadManager {
                 mMissionsPending.remove(mission);
             } else if (mission instanceof FinishedMission) {
                 mMissionsFinished.remove(mission);
-                mDownloadDataSource.deleteMission(mission);
+                mFinishedMissionStore.deleteMission(mission);
             }
 
             mHandler.sendEmptyMessage(DownloadManagerService.MESSAGE_DELETED);
@@ -283,18 +268,54 @@ public class DownloadManager {
         }
     }
 
+    public void forgetMission(StoredFileHelper storage) {
+        synchronized (this) {
+            Mission mission = getAnyMission(storage);
+            if (mission == null) return;
+
+            if (mission instanceof DownloadMission) {
+                mMissionsPending.remove(mission);
+            } else if (mission instanceof FinishedMission) {
+                mMissionsFinished.remove(mission);
+                mFinishedMissionStore.deleteMission(mission);
+            }
+
+            mHandler.sendEmptyMessage(DownloadManagerService.MESSAGE_DELETED);
+            mission.storage = null;
+            mission.delete();
+        }
+    }
+
+    public void tryRecover(DownloadMission mission) {
+        StoredDirectoryHelper mainStorage = getMainStorage(mission.storage.getTag());
+
+        if (!mission.storage.isInvalid() && mission.storage.create()) return;
+
+        // using javaIO cannot recreate the file
+        // using SAF in older devices (no tree available)
+        //
+        // force the user to pick again the save path
+        mission.storage.invalidate();
+
+        if (mainStorage == null) return;
+
+        // if the user has changed the save path before this download, the original save path will be lost
+        StoredFileHelper newStorage = mainStorage.createFile(mission.storage.getName(), mission.storage.getType());
+
+        if (newStorage != null) mission.storage = newStorage;
+    }
+
 
     /**
-     * Get a pending mission by its location and name
+     * Get a pending mission by its path
      *
-     * @param location the location
+     * @param storage where the file possible is stored
-     * @param name     the name
      * @return the mission or null if no such mission exists
      */
     @Nullable
-    private DownloadMission getPendingMission(String location, String name) {
+    private DownloadMission getPendingMission(StoredFileHelper storage) {
         for (DownloadMission mission : mMissionsPending) {
-            if (location.equalsIgnoreCase(mission.location) && name.equalsIgnoreCase(mission.name)) {
+            if (mission.storage.equals(storage)) {
                 return mission;
             }
         }
@@ -302,16 +323,14 @@ public class DownloadManager {
     }
 
     /**
-     * Get a finished mission by its location and name
+     * Get a finished mission by its path
      *
-     * @param location the location
+     * @param storage where the file possible is stored
-     * @param name     the name
      * @return the mission index or -1 if no such mission exists
      */
-    private int getFinishedMissionIndex(String location, String name) {
+    private int getFinishedMissionIndex(StoredFileHelper storage) {
         for (int i = 0; i < mMissionsFinished.size(); i++) {
-            FinishedMission mission = mMissionsFinished.get(i);
+            if (mMissionsFinished.get(i).storage.equals(storage)) {
-            if (location.equalsIgnoreCase(mission.location) && name.equalsIgnoreCase(mission.name)) {
                 return i;
             }
         }
@@ -319,12 +338,12 @@ public class DownloadManager {
         return -1;
     }
 
-    public Mission getAnyMission(String location, String name) {
+    private Mission getAnyMission(StoredFileHelper storage) {
         synchronized (this) {
-            Mission mission = getPendingMission(location, name);
+            Mission mission = getPendingMission(storage);
             if (mission != null) return mission;
 
-            int idx = getFinishedMissionIndex(location, name);
+            int idx = getFinishedMissionIndex(storage);
             if (idx >= 0) return mMissionsFinished.get(idx);
         }
 
@@ -335,7 +354,7 @@ public class DownloadManager {
         int count = 0;
         synchronized (this) {
             for (DownloadMission mission : mMissionsPending) {
-                if (mission.running && !mission.isFinished() && !mission.isPsFailed())
+                if (mission.running && !mission.isPsFailed() && !mission.isFinished())
                     count++;
             }
         }
@@ -343,62 +362,36 @@ public class DownloadManager {
         return count;
     }
 
-    void pauseAllMissions() {
+    public void pauseAllMissions(boolean force) {
+        boolean flag = false;
+
         synchronized (this) {
-            for (DownloadMission mission : mMissionsPending) mission.pause();
+            for (DownloadMission mission : mMissionsPending) {
-        }
+                if (!mission.running || mission.isPsRunning() || mission.isFinished()) continue;
-    }
 
+                if (force) mission.threads = null;// avoid waiting for threads
 
-    /**
+                mission.pause();
-     * Splits the filename into name and extension
+                flag = true;
-     * <p>
-     * Dots are ignored if they appear: not at all, at the beginning of the file,
-     * at the end of the file
-     *
-     * @param name the name to split
-     * @return a string array with a length of 2 containing the name and the extension
-     */
-    private static String[] splitName(String name) {
-        int dotIndex = name.lastIndexOf('.');
-        if (dotIndex <= 0 || (dotIndex == name.length() - 1)) {
-            return new String[]{name, ""};
-        } else {
-            return new String[]{name.substring(0, dotIndex), name.substring(dotIndex + 1)};
-        }
-    }
-
-    /**
-     * Generates a unique file name.
-     * <p>
-     * e.g. "myName (1).txt" if the name "myName.txt" exists.
-     *
-     * @param location the location (to check for existing files)
-     * @param name     the name of the file
-     * @return the unique file name
-     * @throws IllegalArgumentException if the location is not a directory
-     * @throws SecurityException        if the location is not readable
-     */
-    private static String generateUniqueName(String location, String name) {
-        if (location == null) throw new NullPointerException("location is null");
-        if (name == null) throw new NullPointerException("name is null");
-        File destination = new File(location);
-        if (!destination.isDirectory()) {
-            throw new IllegalArgumentException("location is not a directory: " + location);
-        }
-        final String[] nameParts = splitName(name);
-        String[] existingName = destination.list((dir, name1) -> name1.startsWith(nameParts[0]));
-        Arrays.sort(existingName);
-        String newName;
-        int downloadIndex = 0;
-        do {
-            newName = nameParts[0] + " (" + downloadIndex + ")." + nameParts[1];
-            ++downloadIndex;
-            if (downloadIndex == 1000) {  // Probably an error on our side
-                throw new RuntimeException("Too many existing files");
             }
-        } while (Arrays.binarySearch(existingName, newName) >= 0);
+        }
-        return newName;
+
+        if (flag) mHandler.sendEmptyMessage(DownloadManagerService.MESSAGE_PAUSED);
+    }
+
+    public void startAllMissions() {
+        boolean flag = false;
+
+        synchronized (this) {
+            for (DownloadMission mission : mMissionsPending) {
+                if (mission.running || mission.isCorrupt()) continue;
+
+                flag = true;
+                mission.start();
+            }
+        }
+
+        if (flag) mHandler.sendEmptyMessage(DownloadManagerService.MESSAGE_PROGRESS);
     }
 
     /**
@@ -410,36 +403,41 @@ public class DownloadManager {
         synchronized (this) {
             mMissionsPending.remove(mission);
             mMissionsFinished.add(0, new FinishedMission(mission));
-            mDownloadDataSource.addMission(mission);
+            mFinishedMissionStore.addFinishedMission(mission);
         }
     }
 
     /**
-     * runs another mission in queue if possible
+     * runs one or multiple missions in from queue if possible
      *
-     * @return true if exits pending missions running or a mission was started, otherwise, false
+     * @return true if one or multiple missions are running, otherwise, false
      */
-    boolean runAnotherMission() {
+    boolean runMissions() {
         synchronized (this) {
             if (mMissionsPending.size() < 1) return false;
-
-            int i = getRunningMissionsCount();
-            if (i > 0) return true;
-
             if (!canDownloadInCurrentNetwork()) return false;
 
-            for (DownloadMission mission : mMissionsPending) {
+            if (mPrefQueueLimit) {
-                if (!mission.running && mission.errCode == DownloadMission.ERROR_NOTHING && mission.enqueued) {
+                for (DownloadMission mission : mMissionsPending)
-                    resumeMission(mission);
+                    if (!mission.isFinished() && mission.running) return true;
-                    return true;
-                }
             }
 
-            return false;
+            boolean flag = false;
+            for (DownloadMission mission : mMissionsPending) {
+                if (mission.running || !mission.enqueued || mission.isFinished() || mission.hasInvalidStorage())
+                    continue;
+
+                resumeMission(mission);
+                if (mPrefQueueLimit) return true;
+                flag = true;
+            }
+
+            return flag;
         }
     }
 
     public MissionIterator getIterator() {
+        mSelfMissionsControl = true;
         return new MissionIterator();
     }
 
@@ -449,7 +447,7 @@ public class DownloadManager {
     public void forgetFinishedDownloads() {
         synchronized (this) {
             for (FinishedMission mission : mMissionsFinished) {
-                mDownloadDataSource.deleteMission(mission);
+                mFinishedMissionStore.deleteMission(mission);
             }
             mMissionsFinished.clear();
         }
@@ -457,31 +455,43 @@ public class DownloadManager {
 
     private boolean canDownloadInCurrentNetwork() {
         if (mLastNetworkStatus == NetworkState.Unavailable) return false;
-        return !(mPrefCrossNetwork && mLastNetworkStatus == NetworkState.MobileOperating);
+        return !(mPrefMeteredDownloads && mLastNetworkStatus == NetworkState.MeteredOperating);
     }
 
-    void handleConnectivityChange(NetworkState currentStatus) {
+    void handleConnectivityState(NetworkState currentStatus, boolean updateOnly) {
         if (currentStatus == mLastNetworkStatus) return;
 
         mLastNetworkStatus = currentStatus;
+        if (currentStatus == NetworkState.Unavailable) return;
 
-        if (currentStatus == NetworkState.Unavailable) {
+        if (!mSelfMissionsControl || updateOnly) {
-            return;
+            return;// don't touch anything without the user interaction
-        } else if (currentStatus != NetworkState.MobileOperating || !mPrefCrossNetwork) {
-            return;
         }
 
-        boolean flag = false;
+        boolean isMetered = mPrefMeteredDownloads && mLastNetworkStatus == NetworkState.MeteredOperating;
+
+        int running = 0;
+        int paused = 0;
         synchronized (this) {
             for (DownloadMission mission : mMissionsPending) {
-                if (mission.running && !mission.isFinished() && !mission.isPsRunning()) {
+                if (mission.isCorrupt() || mission.isPsRunning()) continue;
-                    flag = true;
+
+                if (mission.running && isMetered) {
+                    paused++;
                     mission.pause();
+                } else if (!mission.running && !isMetered && mission.enqueued) {
+                    running++;
+                    mission.start();
+                    if (mPrefQueueLimit) break;
                 }
             }
         }
 
-        if (flag) mHandler.sendEmptyMessage(DownloadManagerService.MESSAGE_PAUSED);
+        if (running > 0) {
+            mHandler.sendEmptyMessage(DownloadManagerService.MESSAGE_PROGRESS);
+            return;
+        }
+        if (paused > 0) mHandler.sendEmptyMessage(DownloadManagerService.MESSAGE_PAUSED);
     }
 
     void updateMaximumAttempts() {
@@ -506,21 +516,46 @@ public class DownloadManager {
         ), Toast.LENGTH_LONG).show();
     }
 
-    void checkForRunningMission(String location, String name, DownloadManagerService.DMChecker check) {
+    public MissionState checkForExistingMission(StoredFileHelper storage) {
-        boolean listed;
-        boolean finished = false;
-
         synchronized (this) {
-            DownloadMission mission = getPendingMission(location, name);
+            DownloadMission pending = getPendingMission(storage);
-            if (mission != null) {
+
-                listed = true;
+            if (pending == null) {
+                if (getFinishedMissionIndex(storage) >= 0) return MissionState.Finished;
             } else {
-                listed = getFinishedMissionIndex(location, name) >= 0;
+                if (pending.isFinished()) {
-                finished = listed;
+                    return MissionState.Finished;// this never should happen (race-condition)
+                } else {
+                    return pending.running ? MissionState.PendingRunning : MissionState.Pending;
+                }
             }
         }
 
-        check.callback(listed, finished);
+        return MissionState.None;
+    }
+
+    private static boolean isDirectoryAvailable(File directory) {
+        return directory != null && directory.canWrite() && directory.exists();
+    }
+
+    static File pickAvailableTemporalDir(@NonNull Context ctx) {
+        if (isDirectoryAvailable(ctx.getExternalFilesDir(null)))
+            return ctx.getExternalFilesDir(null);
+        else if (isDirectoryAvailable(ctx.getFilesDir()))
+            return ctx.getFilesDir();
+
+        // this never should happen
+        return ctx.getDir("tmp", Context.MODE_PRIVATE);
+    }
+
+    @Nullable
+    private StoredDirectoryHelper getMainStorage(@NonNull String tag) {
+        if (tag.equals(TAG_AUDIO)) return mMainStorageAudio;
+        if (tag.equals(TAG_VIDEO)) return mMainStorageVideo;
+
+        Log.w(TAG, "Unknown download category, not [audio video]: " + tag);
+
+        return null;// this never should happen
     }
 
     public class MissionIterator extends DiffUtil.Callback {
@@ -592,39 +627,6 @@ public class DownloadManager {
             return SPECIAL_NOTHING;
         }
 
-        public MissionItem getItemUnsafe(int position) {
-            synchronized (DownloadManager.this) {
-                int count = mMissionsPending.size();
-                int count2 = mMissionsFinished.size();
-
-                if (count > 0) {
-                    position--;
-                    if (position == -1)
-                        return new MissionItem(SPECIAL_PENDING);
-                    else if (position < count)
-                        return new MissionItem(SPECIAL_NOTHING, mMissionsPending.get(position));
-                    else if (position == count && count2 > 0)
-                        return new MissionItem(SPECIAL_FINISHED);
-                    else
-                        position -= count;
-                } else {
-                    if (count2 > 0 && position == 0) {
-                        return new MissionItem(SPECIAL_FINISHED);
-                    }
-                }
-
-                position--;
-
-                if (count2 < 1) {
-                    throw new RuntimeException(
-                            String.format("Out of range. pending_count=%s  finished_count=%s  position=%s", count, count2, position)
-                    );
-                }
-
-                return new MissionItem(SPECIAL_NOTHING, mMissionsFinished.get(position));
-            }
-        }
-
 
         public void start() {
             current = getSpecialItems();
@@ -647,6 +649,32 @@ public class DownloadManager {
             return hasFinished;
         }
 
+        /**
+         * Check if exists missions running and paused. Corrupted and hidden missions are not counted
+         *
+         * @return two-dimensional array contains the current missions state.
+         * 1° entry: true if has at least one mission running
+         * 2° entry: true if has at least one mission paused
+         */
+        public boolean[] hasValidPendingMissions() {
+            boolean running = false;
+            boolean paused = false;
+
+            synchronized (DownloadManager.this) {
+                for (DownloadMission mission : mMissionsPending) {
+                    if (hidden.contains(mission) || mission.isCorrupt())
+                        continue;
+
+                    if (mission.running)
+                        paused = true;
+                    else
+                        running = true;
+                }
+            }
+
+            return new boolean[]{running, paused};
+        }
+
 
         @Override
         public int getOldListSize() {
@@ -665,7 +693,14 @@ public class DownloadManager {
 
         @Override
         public boolean areContentsTheSame(int oldItemPosition, int newItemPosition) {
-            return areItemsTheSame(oldItemPosition, newItemPosition);
+            Object x = snapshot.get(oldItemPosition);
+            Object y = current.get(newItemPosition);
+
+            if (x instanceof Mission && y instanceof Mission) {
+                return ((Mission) x).storage.equals(((Mission) y).storage);
+            }
+
+            return false;
         }
     }
 

app/src/main/java/us/shandian/giga/service/DownloadManagerService.java

@@ -1,21 +1,22 @@
 package us.shandian.giga.service;
 
 import android.Manifest;
+import android.app.AlertDialog;
 import android.app.Notification;
 import android.app.NotificationManager;
 import android.app.PendingIntent;
 import android.app.Service;
 import android.content.BroadcastReceiver;
-import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
-import android.content.ServiceConnection;
 import android.content.SharedPreferences;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.net.ConnectivityManager;
+import android.net.Network;
 import android.net.NetworkInfo;
+import android.net.NetworkRequest;
 import android.net.Uri;
 import android.os.Binder;
 import android.os.Build;
@@ -24,6 +25,9 @@ import android.os.IBinder;
 import android.os.Looper;
 import android.os.Message;
 import android.preference.PreferenceManager;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.support.annotation.StringRes;
 import android.support.v4.app.NotificationCompat;
 import android.support.v4.app.NotificationCompat.Builder;
 import android.support.v4.content.PermissionChecker;
@@ -36,9 +40,13 @@ import org.schabi.newpipe.download.DownloadActivity;
 import org.schabi.newpipe.player.helper.LockManager;
 
 import java.io.File;
+import java.io.IOException;
 import java.util.ArrayList;
 
 import us.shandian.giga.get.DownloadMission;
+import us.shandian.giga.io.StoredDirectoryHelper;
+import us.shandian.giga.io.StoredFileHelper;
+import us.shandian.giga.postprocessing.Postprocessing;
 import us.shandian.giga.service.DownloadManager.NetworkState;
 
 import static org.schabi.newpipe.BuildConfig.APPLICATION_ID;
@@ -48,7 +56,6 @@ public class DownloadManagerService extends Service {
 
     private static final String TAG = "DownloadManagerService";
 
-    public static final int MESSAGE_RUNNING = 0;
     public static final int MESSAGE_PAUSED = 1;
     public static final int MESSAGE_FINISHED = 2;
     public static final int MESSAGE_PROGRESS = 3;
@@ -59,24 +66,25 @@ public class DownloadManagerService extends Service {
     private static final int DOWNLOADS_NOTIFICATION_ID = 1001;
 
     private static final String EXTRA_URLS = "DownloadManagerService.extra.urls";
-    private static final String EXTRA_NAME = "DownloadManagerService.extra.name";
-    private static final String EXTRA_LOCATION = "DownloadManagerService.extra.location";
     private static final String EXTRA_KIND = "DownloadManagerService.extra.kind";
     private static final String EXTRA_THREADS = "DownloadManagerService.extra.threads";
     private static final String EXTRA_POSTPROCESSING_NAME = "DownloadManagerService.extra.postprocessingName";
     private static final String EXTRA_POSTPROCESSING_ARGS = "DownloadManagerService.extra.postprocessingArgs";
     private static final String EXTRA_SOURCE = "DownloadManagerService.extra.source";
     private static final String EXTRA_NEAR_LENGTH = "DownloadManagerService.extra.nearLength";
+    private static final String EXTRA_PATH = "DownloadManagerService.extra.storagePath";
+    private static final String EXTRA_PARENT_PATH = "DownloadManagerService.extra.storageParentPath";
+    private static final String EXTRA_STORAGE_TAG = "DownloadManagerService.extra.storageTag";
 
     private static final String ACTION_RESET_DOWNLOAD_FINISHED = APPLICATION_ID + ".reset_download_finished";
     private static final String ACTION_OPEN_DOWNLOADS_FINISHED = APPLICATION_ID + ".open_downloads_finished";
 
-    private DMBinder mBinder;
+    private DownloadManagerBinder mBinder;
     private DownloadManager mManager;
     private Notification mNotification;
     private Handler mHandler;
     private boolean mForeground = false;
-    private NotificationManager notificationManager = null;
+    private NotificationManager mNotificationManager = null;
     private boolean mDownloadNotificationEnable = true;
 
     private int downloadDoneCount = 0;
@@ -85,7 +93,9 @@ public class DownloadManagerService extends Service {
 
     private final ArrayList<Handler> mEchoObservers = new ArrayList<>(1);
 
-    private BroadcastReceiver mNetworkStateListener;
+    private ConnectivityManager mConnectivityManager;
+    private BroadcastReceiver mNetworkStateListener = null;
+    private ConnectivityManager.NetworkCallback mNetworkStateListenerL = null;
 
     private SharedPreferences mPrefs = null;
     private final SharedPreferences.OnSharedPreferenceChangeListener mPrefChangeListener = this::handlePreferenceChange;
@@ -106,10 +116,10 @@ public class DownloadManagerService extends Service {
     /**
      * notify media scanner on downloaded media file ...
      *
-     * @param file the downloaded file
+     * @param file the downloaded file uri
      */
-    private void notifyMediaScanner(File file) {
+    private void notifyMediaScanner(Uri file) {
-        sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.fromFile(file)));
+        sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, file));
     }
 
     @Override
@@ -120,7 +130,7 @@ public class DownloadManagerService extends Service {
             Log.d(TAG, "onCreate");
         }
 
-        mBinder = new DMBinder();
+        mBinder = new DownloadManagerBinder();
         mHandler = new Handler(Looper.myLooper()) {
             @Override
             public void handleMessage(Message msg) {
@@ -128,7 +138,9 @@ public class DownloadManagerService extends Service {
             }
         };
 
-        mManager = new DownloadManager(this, mHandler);
+        mPrefs = PreferenceManager.getDefaultSharedPreferences(this);
+
+        mManager = new DownloadManager(this, mHandler, loadMainVideoStorage(), loadMainAudioStorage());
 
         Intent openDownloadListIntent = new Intent(this, DownloadActivity.class)
                 .setAction(Intent.ACTION_MAIN);
@@ -147,54 +159,55 @@ public class DownloadManagerService extends Service {
                 .setContentText(getString(R.string.msg_running_detail));
 
         mNotification = builder.build();
-        notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
 
-        mNetworkStateListener = new BroadcastReceiver() {
+        mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
-            @Override
+        mConnectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
-            public void onReceive(Context context, Intent intent) {
+
-                if (intent.getBooleanExtra(ConnectivityManager.EXTRA_NO_CONNECTIVITY, false)) {
+        if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
-                    handleConnectivityChange(null);
+            mNetworkStateListenerL = new ConnectivityManager.NetworkCallback() {
-                    return;
+                @Override
+                public void onAvailable(Network network) {
+                    handleConnectivityState(false);
                 }
-                handleConnectivityChange(intent.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO));
-            }
-        };
-        registerReceiver(mNetworkStateListener, new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
 
-        mPrefs = PreferenceManager.getDefaultSharedPreferences(this);
+                @Override
+                public void onLost(Network network) {
+                    handleConnectivityState(false);
+                }
+            };
+            mConnectivityManager.registerNetworkCallback(new NetworkRequest.Builder().build(), mNetworkStateListenerL);
+        } else {
+            mNetworkStateListener = new BroadcastReceiver() {
+                @Override
+                public void onReceive(Context context, Intent intent) {
+                    handleConnectivityState(false);
+                }
+            };
+            registerReceiver(mNetworkStateListener, new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
+        }
+
         mPrefs.registerOnSharedPreferenceChangeListener(mPrefChangeListener);
 
         handlePreferenceChange(mPrefs, getString(R.string.downloads_cross_network));
         handlePreferenceChange(mPrefs, getString(R.string.downloads_maximum_retry));
+        handlePreferenceChange(mPrefs, getString(R.string.downloads_queue_limit));
 
         mLock = new LockManager(this);
     }
 
     @Override
-    public int onStartCommand(Intent intent, int flags, int startId) {
+    public int onStartCommand(final Intent intent, int flags, int startId) {
         if (DEBUG) {
-            if (intent == null) {
+            Log.d(TAG, intent == null ? "Restarting" : "Starting");
-                Log.d(TAG, "Restarting");
-                return START_NOT_STICKY;
-            }
-            Log.d(TAG, "Starting");
         }
+
+        if (intent == null) return START_NOT_STICKY;
+
         Log.i(TAG, "Got intent: " + intent);
         String action = intent.getAction();
         if (action != null) {
             if (action.equals(Intent.ACTION_RUN)) {
-                String[] urls = intent.getStringArrayExtra(EXTRA_URLS);
+                mHandler.post(() -> startMission(intent));
-                String name = intent.getStringExtra(EXTRA_NAME);
-                String location = intent.getStringExtra(EXTRA_LOCATION);
-                int threads = intent.getIntExtra(EXTRA_THREADS, 1);
-                char kind = intent.getCharExtra(EXTRA_KIND, '?');
-                String psName = intent.getStringExtra(EXTRA_POSTPROCESSING_NAME);
-                String[] psArgs = intent.getStringArrayExtra(EXTRA_POSTPROCESSING_ARGS);
-                String source = intent.getStringExtra(EXTRA_SOURCE);
-                long nearLength = intent.getLongExtra(EXTRA_NEAR_LENGTH, 0);
-
-                mHandler.post(() -> mManager.startMission(urls, location, name, kind, threads, source, psName, psArgs, nearLength));
-
             } else if (downloadDoneNotification != null) {
                 if (action.equals(ACTION_RESET_DOWNLOAD_FINISHED) || action.equals(ACTION_OPEN_DOWNLOADS_FINISHED)) {
                     downloadDoneCount = 0;
@@ -221,32 +234,36 @@ public class DownloadManagerService extends Service {
 
         stopForeground(true);
 
-        if (notificationManager != null && downloadDoneNotification != null) {
+        if (mNotificationManager != null && downloadDoneNotification != null) {
             downloadDoneNotification.setDeleteIntent(null);// prevent NewPipe running when is killed, cleared from recent, etc
-            notificationManager.notify(DOWNLOADS_NOTIFICATION_ID, downloadDoneNotification.build());
+            mNotificationManager.notify(DOWNLOADS_NOTIFICATION_ID, downloadDoneNotification.build());
         }
 
-        mManager.pauseAllMissions();
-
         manageLock(false);
 
-        unregisterReceiver(mNetworkStateListener);
+        if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
+            mConnectivityManager.unregisterNetworkCallback(mNetworkStateListenerL);
+        else
+            unregisterReceiver(mNetworkStateListener);
+
         mPrefs.unregisterOnSharedPreferenceChangeListener(mPrefChangeListener);
 
         if (icDownloadDone != null) icDownloadDone.recycle();
         if (icDownloadFailed != null) icDownloadFailed.recycle();
         if (icLauncher != null) icLauncher.recycle();
+
+        mManager.pauseAllMissions(true);
     }
 
     @Override
     public IBinder onBind(Intent intent) {
         int permissionCheck;
-        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.JELLY_BEAN) {
+//        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.JELLY_BEAN) {
-            permissionCheck = PermissionChecker.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE);
+//            permissionCheck = PermissionChecker.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE);
-            if (permissionCheck == PermissionChecker.PERMISSION_DENIED) {
+//            if (permissionCheck == PermissionChecker.PERMISSION_DENIED) {
-                Toast.makeText(this, "Permission denied (read)", Toast.LENGTH_SHORT).show();
+//                Toast.makeText(this, "Permission denied (read)", Toast.LENGTH_SHORT).show();
-            }
+//            }
-        }
+//        }
 
         permissionCheck = PermissionChecker.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE);
         if (permissionCheck == PermissionChecker.PERMISSION_DENIED) {
@@ -261,18 +278,19 @@ public class DownloadManagerService extends Service {
 
         switch (msg.what) {
             case MESSAGE_FINISHED:
-                notifyMediaScanner(mission.getDownloadedFile());
+                notifyMediaScanner(mission.storage.getUri());
-                notifyFinishedDownload(mission.name);
+                notifyFinishedDownload(mission.storage.getName());
                 mManager.setFinished(mission);
-                updateForegroundState(mManager.runAnotherMission());
+                handleConnectivityState(false);
+                updateForegroundState(mManager.runMissions());
                 break;
-            case MESSAGE_RUNNING:
             case MESSAGE_PROGRESS:
                 updateForegroundState(true);
                 break;
             case MESSAGE_ERROR:
                 notifyFailedDownload(mission);
-                updateForegroundState(mManager.runAnotherMission());
+                handleConnectivityState(false);
+                updateForegroundState(mManager.runMissions());
                 break;
             case MESSAGE_PAUSED:
                 updateForegroundState(mManager.getRunningMissionsCount() > 0);
@@ -293,46 +311,46 @@ public class DownloadManagerService extends Service {
         }
     }
 
-    private void handleConnectivityChange(NetworkInfo info) {
+    private void handleConnectivityState(boolean updateOnly) {
+        NetworkInfo info = mConnectivityManager.getActiveNetworkInfo();
         NetworkState status;
 
         if (info == null) {
             status = NetworkState.Unavailable;
-            Log.i(TAG, "actual connectivity status is unavailable");
+            Log.i(TAG, "Active network [connectivity is unavailable]");
-        } else if (!info.isAvailable() || !info.isConnected()) {
-            status = NetworkState.Unavailable;
-            Log.i(TAG, "actual connectivity status is not available and not connected");
         } else {
-            int type = info.getType();
+            boolean connected = info.isConnected();
-            if (type == ConnectivityManager.TYPE_MOBILE || type == ConnectivityManager.TYPE_MOBILE_DUN) {
+            boolean metered = mConnectivityManager.isActiveNetworkMetered();
-                status = NetworkState.MobileOperating;
+
-            } else if (type == ConnectivityManager.TYPE_WIFI) {
+            if (connected)
-                status = NetworkState.WifiOperating;
+                status = metered ? NetworkState.MeteredOperating : NetworkState.Operating;
-            } else if (type == ConnectivityManager.TYPE_WIMAX ||
+            else
-                    type == ConnectivityManager.TYPE_ETHERNET ||
-                    type == ConnectivityManager.TYPE_BLUETOOTH) {
-                status = NetworkState.OtherOperating;
-            } else {
                 status = NetworkState.Unavailable;
-            }
+
-            Log.i(TAG, "actual connectivity status is " + status.name());
+            Log.i(TAG, "Active network [connected=" + connected + " metered=" + metered + "] " + info.toString());
         }
 
         if (mManager == null) return;// avoid race-conditions while the service is starting
-        mManager.handleConnectivityChange(status);
+        mManager.handleConnectivityState(status, updateOnly);
     }
 
-    private void handlePreferenceChange(SharedPreferences prefs, String key) {
+    private void handlePreferenceChange(SharedPreferences prefs, @NonNull String key) {
         if (key.equals(getString(R.string.downloads_maximum_retry))) {
             try {
                 String value = prefs.getString(key, getString(R.string.downloads_maximum_retry_default));
-                mManager.mPrefMaxRetry = Integer.parseInt(value);
+                mManager.mPrefMaxRetry = value == null ? 0 : Integer.parseInt(value);
             } catch (Exception e) {
                 mManager.mPrefMaxRetry = 0;
             }
             mManager.updateMaximumAttempts();
         } else if (key.equals(getString(R.string.downloads_cross_network))) {
-            mManager.mPrefCrossNetwork = prefs.getBoolean(key, false);
+            mManager.mPrefMeteredDownloads = prefs.getBoolean(key, false);
+        } else if (key.equals(getString(R.string.downloads_queue_limit))) {
+            mManager.mPrefQueueLimit = prefs.getBoolean(key, true);
+        } else if (key.equals(getString(R.string.download_path_video_key))) {
+            mManager.mMainStorageVideo = loadMainVideoStorage();
+        } else if (key.equals(getString(R.string.download_path_audio_key))) {
+            mManager.mMainStorageAudio = loadMainAudioStorage();
         }
     }
 
@@ -350,46 +368,78 @@ public class DownloadManagerService extends Service {
         mForeground = state;
     }
 
-    public static void startMission(Context context, String urls[], String location, String name, char kind,
+    /**
+     * Start a new download mission
+     *
+     * @param context    the activity context
+     * @param urls       the list of urls to download
+     * @param storage    where the file is saved
+     * @param kind       type of file (a: audio  v: video  s: subtitle ?: file-extension defined)
+     * @param threads    the number of threads maximal used to download chunks of the file.
+     * @param psName     the name of the required post-processing algorithm, or {@code null} to ignore.
+     * @param source     source url of the resource
+     * @param psArgs     the arguments for the post-processing algorithm.
+     * @param nearLength the approximated final length of the file
+     */
+    public static void startMission(Context context, String[] urls, StoredFileHelper storage, char kind,
                                     int threads, String source, String psName, String[] psArgs, long nearLength) {
         Intent intent = new Intent(context, DownloadManagerService.class);
         intent.setAction(Intent.ACTION_RUN);
         intent.putExtra(EXTRA_URLS, urls);
-        intent.putExtra(EXTRA_NAME, name);
-        intent.putExtra(EXTRA_LOCATION, location);
         intent.putExtra(EXTRA_KIND, kind);
         intent.putExtra(EXTRA_THREADS, threads);
         intent.putExtra(EXTRA_SOURCE, source);
         intent.putExtra(EXTRA_POSTPROCESSING_NAME, psName);
         intent.putExtra(EXTRA_POSTPROCESSING_ARGS, psArgs);
         intent.putExtra(EXTRA_NEAR_LENGTH, nearLength);
+
+        intent.putExtra(EXTRA_PARENT_PATH, storage.getParentUri());
+        intent.putExtra(EXTRA_PATH, storage.getUri());
+        intent.putExtra(EXTRA_STORAGE_TAG, storage.getTag());
+
         context.startService(intent);
     }
 
-    public static void checkForRunningMission(Context context, String location, String name, DMChecker check) {
+    private void startMission(Intent intent) {
-        Intent intent = new Intent();
+        String[] urls = intent.getStringArrayExtra(EXTRA_URLS);
-        intent.setClass(context, DownloadManagerService.class);
+        Uri path = intent.getParcelableExtra(EXTRA_PATH);
-        context.bindService(intent, new ServiceConnection() {
+        Uri parentPath = intent.getParcelableExtra(EXTRA_PARENT_PATH);
-            @Override
+        int threads = intent.getIntExtra(EXTRA_THREADS, 1);
-            public void onServiceConnected(ComponentName cname, IBinder service) {
+        char kind = intent.getCharExtra(EXTRA_KIND, '?');
-                try {
+        String psName = intent.getStringExtra(EXTRA_POSTPROCESSING_NAME);
-                    ((DMBinder) service).getDownloadManager().checkForRunningMission(location, name, check);
+        String[] psArgs = intent.getStringArrayExtra(EXTRA_POSTPROCESSING_ARGS);
-                } catch (Exception err) {
+        String source = intent.getStringExtra(EXTRA_SOURCE);
-                    Log.w(TAG, "checkForRunningMission() callback is defective", err);
+        long nearLength = intent.getLongExtra(EXTRA_NEAR_LENGTH, 0);
-                }
+        String tag = intent.getStringExtra(EXTRA_STORAGE_TAG);
 
-                // TODO: find a efficient way to unbind the service. This destroy the service due idle, but is started again when the user start a download.
+        StoredFileHelper storage;
-                context.unbindService(this);
+        try {
-            }
+            storage = new StoredFileHelper(this, parentPath, path, tag);
+        } catch (IOException e) {
+            throw new RuntimeException(e);// this never should happen
+        }
 
-            @Override
+        Postprocessing ps;
-            public void onServiceDisconnected(ComponentName name) {
+        if (psName == null)
-            }
+            ps = null;
-        }, Context.BIND_AUTO_CREATE);
+        else
+            ps = Postprocessing.getAlgorithm(psName, psArgs);
+
+        final DownloadMission mission = new DownloadMission(urls, storage, kind, ps);
+        mission.threadCount = threads;
+        mission.source = source;
+        mission.nearLength = nearLength;
+
+        if (ps != null)
+            ps.setTemporalDir(DownloadManager.pickAvailableTemporalDir(this));
+
+        handleConnectivityState(true);// first check the actual network status
+
+        mManager.startMission(mission);
     }
 
     public void notifyFinishedDownload(String name) {
-        if (!mDownloadNotificationEnable || notificationManager == null) {
+        if (!mDownloadNotificationEnable || mNotificationManager == null) {
             return;
         }
 
@@ -428,7 +478,7 @@ public class DownloadManagerService extends Service {
             downloadDoneNotification.setContentText(downloadDoneList);
         }
 
-        notificationManager.notify(DOWNLOADS_NOTIFICATION_ID, downloadDoneNotification.build());
+        mNotificationManager.notify(DOWNLOADS_NOTIFICATION_ID, downloadDoneNotification.build());
         downloadDoneCount++;
     }
 
@@ -450,15 +500,15 @@ public class DownloadManagerService extends Service {
         if (android.os.Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
             downloadFailedNotification.setContentTitle(getString(R.string.app_name));
             downloadFailedNotification.setStyle(new NotificationCompat.BigTextStyle()
-                    .bigText(getString(R.string.download_failed).concat(": ").concat(mission.name)));
+                    .bigText(getString(R.string.download_failed).concat(": ").concat(mission.storage.getName())));
         } else {
             downloadFailedNotification.setContentTitle(getString(R.string.download_failed));
-            downloadFailedNotification.setContentText(mission.name);
+            downloadFailedNotification.setContentText(mission.storage.getName());
             downloadFailedNotification.setStyle(new NotificationCompat.BigTextStyle()
-                    .bigText(mission.name));
+                    .bigText(mission.storage.getName()));
         }
 
-        notificationManager.notify(id, downloadFailedNotification.build());
+        mNotificationManager.notify(id, downloadFailedNotification.build());
     }
 
     private PendingIntent makePendingIntent(String action) {
@@ -487,12 +537,66 @@ public class DownloadManagerService extends Service {
         mLockAcquired = acquire;
     }
 
-    // Wrapper of DownloadManager
+    private StoredDirectoryHelper loadMainVideoStorage() {
-    public class DMBinder extends Binder {
+        return loadMainStorage(R.string.download_path_video_key, DownloadManager.TAG_VIDEO);
+    }
+
+    private StoredDirectoryHelper loadMainAudioStorage() {
+        return loadMainStorage(R.string.download_path_audio_key, DownloadManager.TAG_AUDIO);
+    }
+
+    private StoredDirectoryHelper loadMainStorage(@StringRes int prefKey, String tag) {
+        String path = mPrefs.getString(getString(prefKey), null);
+
+        if (path == null || path.isEmpty()) return null;
+
+        if (path.charAt(0) == File.separatorChar) {
+            Log.i(TAG, "Old save path style present: " + path);
+
+            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP)
+                path = Uri.fromFile(new File(path)).toString();
+            else
+                path = "";
+
+            mPrefs.edit().putString(getString(prefKey), "").apply();
+        }
+
+        try {
+            return new StoredDirectoryHelper(this, Uri.parse(path), tag);
+        } catch (Exception e) {
+            Log.e(TAG, "Failed to load the storage of " + tag + " from " + path, e);
+            Toast.makeText(this, R.string.no_available_dir, Toast.LENGTH_LONG).show();
+        }
+
+        return null;
+    }
+
+    ////////////////////////////////////////////////////////////////////////////////////////////////
+    // Wrappers for DownloadManager
+    ////////////////////////////////////////////////////////////////////////////////////////////////
+
+    public class DownloadManagerBinder extends Binder {
         public DownloadManager getDownloadManager() {
             return mManager;
         }
 
+        @Nullable
+        public StoredDirectoryHelper getMainStorageVideo() {
+            return mManager.mMainStorageVideo;
+        }
+
+        @Nullable
+        public StoredDirectoryHelper getMainStorageAudio() {
+            return mManager.mMainStorageAudio;
+        }
+
+        public boolean askForSavePath() {
+            return DownloadManagerService.this.mPrefs.getBoolean(
+                    DownloadManagerService.this.getString(R.string.downloads_storage_ask),
+                    false
+            );
+        }
+
         public void addMissionEventListener(Handler handler) {
             manageObservers(handler, true);
         }
@@ -502,15 +606,15 @@ public class DownloadManagerService extends Service {
         }
 
         public void clearDownloadNotifications() {
-            if (notificationManager == null) return;
+            if (mNotificationManager == null) return;
             if (downloadDoneNotification != null) {
-                notificationManager.cancel(DOWNLOADS_NOTIFICATION_ID);
+                mNotificationManager.cancel(DOWNLOADS_NOTIFICATION_ID);
                 downloadDoneList.setLength(0);
                 downloadDoneCount = 0;
             }
             if (downloadFailedNotification != null) {
                 for (; downloadFailedNotificationID > DOWNLOADS_NOTIFICATION_ID; downloadFailedNotificationID--) {
-                    notificationManager.cancel(downloadFailedNotificationID);
+                    mNotificationManager.cancel(downloadFailedNotificationID);
                 }
                 mFailedDownloads.clear();
                 downloadFailedNotificationID++;
@@ -523,8 +627,4 @@ public class DownloadManagerService extends Service {
 
     }
 
-    public interface DMChecker {
-        void callback(boolean listed, boolean finished);
-    }
-
 }

app/src/main/java/us/shandian/giga/service/MissionState.java

@@ -0,0 +1,5 @@
+package us.shandian.giga.service;
+
+public enum MissionState {
+    None, Pending, PendingRunning, Finished
+}

app/src/main/java/us/shandian/giga/ui/adapter/MissionAdapter.java

@@ -8,21 +8,22 @@ import android.content.Intent;
 import android.net.Uri;
 import android.os.AsyncTask;
 import android.os.Build;
-import android.os.Bundle;
 import android.os.Handler;
 import android.os.Looper;
 import android.os.Message;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
+import android.support.annotation.StringRes;
 import android.support.v4.content.FileProvider;
 import android.support.v4.view.ViewCompat;
 import android.support.v7.app.AlertDialog;
 import android.support.v7.util.DiffUtil;
 import android.support.v7.widget.RecyclerView;
-import android.support.v7.widget.RecyclerView.ViewHolder;
 import android.support.v7.widget.RecyclerView.Adapter;
+import android.support.v7.widget.RecyclerView.ViewHolder;
 import android.util.Log;
 import android.util.SparseArray;
+import android.view.HapticFeedbackConstants;
 import android.view.LayoutInflater;
 import android.view.Menu;
 import android.view.MenuItem;
@@ -36,14 +37,20 @@ import android.widget.Toast;
 
 import org.schabi.newpipe.BuildConfig;
 import org.schabi.newpipe.R;
+import org.schabi.newpipe.report.ErrorActivity;
+import org.schabi.newpipe.report.UserAction;
 import org.schabi.newpipe.util.NavigationHelper;
 
 import java.io.File;
 import java.lang.ref.WeakReference;
+import java.net.URI;
 import java.util.ArrayList;
+import java.util.Collections;
 
 import us.shandian.giga.get.DownloadMission;
 import us.shandian.giga.get.FinishedMission;
+import us.shandian.giga.get.Mission;
+import us.shandian.giga.io.StoredFileHelper;
 import us.shandian.giga.service.DownloadManager;
 import us.shandian.giga.service.DownloadManagerService;
 import us.shandian.giga.ui.common.Deleter;
@@ -57,11 +64,16 @@ import static us.shandian.giga.get.DownloadMission.ERROR_CONNECT_HOST;
 import static us.shandian.giga.get.DownloadMission.ERROR_FILE_CREATION;
 import static us.shandian.giga.get.DownloadMission.ERROR_HTTP_NO_CONTENT;
 import static us.shandian.giga.get.DownloadMission.ERROR_HTTP_UNSUPPORTED_RANGE;
+import static us.shandian.giga.get.DownloadMission.ERROR_INSUFFICIENT_STORAGE;
 import static us.shandian.giga.get.DownloadMission.ERROR_NOTHING;
 import static us.shandian.giga.get.DownloadMission.ERROR_PATH_CREATION;
 import static us.shandian.giga.get.DownloadMission.ERROR_PERMISSION_DENIED;
 import static us.shandian.giga.get.DownloadMission.ERROR_POSTPROCESSING;
+import static us.shandian.giga.get.DownloadMission.ERROR_POSTPROCESSING_HOLD;
+import static us.shandian.giga.get.DownloadMission.ERROR_POSTPROCESSING_STOPPED;
+import static us.shandian.giga.get.DownloadMission.ERROR_PROGRESS_LOST;
 import static us.shandian.giga.get.DownloadMission.ERROR_SSL_EXCEPTION;
+import static us.shandian.giga.get.DownloadMission.ERROR_TIMEOUT;
 import static us.shandian.giga.get.DownloadMission.ERROR_UNKNOWN_EXCEPTION;
 import static us.shandian.giga.get.DownloadMission.ERROR_UNKNOWN_HOST;
 
@@ -69,6 +81,7 @@ public class MissionAdapter extends Adapter<ViewHolder> {
     private static final SparseArray<String> ALGORITHMS = new SparseArray<>();
     private static final String TAG = "MissionAdapter";
     private static final String UNDEFINED_PROGRESS = "--.-%";
+    private static final String DEFAULT_MIME_TYPE = "*/*";
 
 
     static {
@@ -85,9 +98,12 @@ public class MissionAdapter extends Adapter<ViewHolder> {
     private ArrayList<ViewHolderItem> mPendingDownloadsItems = new ArrayList<>();
     private Handler mHandler;
     private MenuItem mClear;
+    private MenuItem mStartButton;
+    private MenuItem mPauseButton;
     private View mEmptyMessage;
+    private RecoverHelper mRecover;
 
-    public MissionAdapter(Context context, DownloadManager downloadManager, MenuItem clearButton, View emptyMessage) {
+    public MissionAdapter(Context context, @NonNull DownloadManager downloadManager, View emptyMessage) {
         mContext = context;
         mDownloadManager = downloadManager;
         mDeleter = null;
@@ -105,10 +121,18 @@ public class MissionAdapter extends Adapter<ViewHolder> {
                         onServiceMessage(msg);
                         break;
                 }
+
+                if (mStartButton != null && mPauseButton != null) switch (msg.what) {
+                    case DownloadManagerService.MESSAGE_DELETED:
+                    case DownloadManagerService.MESSAGE_ERROR:
+                    case DownloadManagerService.MESSAGE_FINISHED:
+                    case DownloadManagerService.MESSAGE_PAUSED:
+                        checkMasterButtonsVisibility();
+                        break;
+                }
             }
         };
 
-        mClear = clearButton;
         mEmptyMessage = emptyMessage;
 
         mIterator = downloadManager.getIterator();
@@ -137,7 +161,11 @@ public class MissionAdapter extends Adapter<ViewHolder> {
 
         if (h.item.mission instanceof DownloadMission) {
             mPendingDownloadsItems.remove(h);
-            if (mPendingDownloadsItems.size() < 1) setAutoRefresh(false);
+            if (mPendingDownloadsItems.size() < 1) {
+                setAutoRefresh(false);
+                if (mStartButton != null) mStartButton.setVisible(false);
+                if (mPauseButton != null) mPauseButton.setVisible(false);
+            }
         }
 
         h.popupMenu.dismiss();
@@ -170,10 +198,10 @@ public class MissionAdapter extends Adapter<ViewHolder> {
         ViewHolderItem h = (ViewHolderItem) view;
         h.item = item;
 
-        Utility.FileType type = Utility.getFileType(item.mission.kind, item.mission.name);
+        Utility.FileType type = Utility.getFileType(item.mission.kind, item.mission.storage.getName());
 
         h.icon.setImageResource(Utility.getIconForFileType(type));
-        h.name.setText(item.mission.name);
+        h.name.setText(item.mission.storage.getName());
 
         h.progress.setColors(Utility.getBackgroundForFileType(mContext, type), Utility.getForegroundForFileType(mContext, type));
 
@@ -225,8 +253,10 @@ public class MissionAdapter extends Adapter<ViewHolder> {
         long deltaDone = mission.done - h.lastDone;
         boolean hasError = mission.errCode != ERROR_NOTHING;
 
-        // on error hide marquee or show if condition (mission.done < 1 || mission.unknownLength) is true
+        // hide on error
-        h.progress.setMarquee(!hasError && (mission.done < 1 || mission.unknownLength));
+        // show if current resource length is not fetched
+        // show if length is unknown
+        h.progress.setMarquee(!hasError && (!mission.isInitialized() || mission.unknownLength));
 
         float progress;
         if (mission.unknownLength) {
@@ -252,7 +282,7 @@ public class MissionAdapter extends Adapter<ViewHolder> {
         long length = mission.getLength();
 
         int state;
-        if (mission.isPsFailed()) {
+        if (mission.isPsFailed() || mission.errCode == ERROR_POSTPROCESSING_HOLD) {
             state = 0;
         } else if (!mission.running) {
             state = mission.enqueued ? 1 : 2;
@@ -305,36 +335,78 @@ public class MissionAdapter extends Adapter<ViewHolder> {
         }
     }
 
-    private boolean viewWithFileProvider(@NonNull File file) {
+    private void viewWithFileProvider(Mission mission) {
-        if (!file.exists()) return true;
+        if (checkInvalidFile(mission)) return;
 
-        String ext = Utility.getFileExt(file.getName());
+        String mimeType = resolveMimeType(mission);
-        if (ext == null) return false;
 
-        String mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension(ext.substring(1));
+        if (BuildConfig.DEBUG)
-        Log.v(TAG, "Mime: " + mimeType + " package: " + BuildConfig.APPLICATION_ID + ".provider");
+            Log.v(TAG, "Mime: " + mimeType + " package: " + BuildConfig.APPLICATION_ID + ".provider");
 
-        Uri uri = FileProvider.getUriForFile(mContext, BuildConfig.APPLICATION_ID + ".provider", file);
+        Uri uri;
+
+        if (mission.storage.isDirect()) {
+            uri = FileProvider.getUriForFile(
+                    mContext,
+                    BuildConfig.APPLICATION_ID + ".provider",
+                    new File(URI.create(mission.storage.getUri().toString()))
+            );
+        } else {
+            uri = mission.storage.getUri();
+        }
 
         Intent intent = new Intent();
         intent.setAction(Intent.ACTION_VIEW);
         intent.setDataAndType(uri, mimeType);
         intent.addFlags(FLAG_GRANT_READ_URI_PERMISSION);
+
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
             intent.addFlags(FLAG_GRANT_PREFIX_URI_PERMISSION);
         }
-        if(Build.VERSION.SDK_INT <= Build.VERSION_CODES.M) {
+        if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.M) {
             intent.addFlags(FLAG_ACTIVITY_NEW_TASK);
         }
+
         //mContext.grantUriPermission(packageName, uri, Intent.FLAG_GRANT_READ_URI_PERMISSION);
-        Log.v(TAG, "Starting intent: " + intent);
+
         if (intent.resolveActivity(mContext.getPackageManager()) != null) {
             mContext.startActivity(intent);
         } else {
-            Toast noPlayerToast = Toast.makeText(mContext, R.string.toast_no_player, Toast.LENGTH_LONG);
+            Toast.makeText(mContext, R.string.toast_no_player, Toast.LENGTH_LONG).show();
-            noPlayerToast.show();
+        }
+    }
+
+    private void shareFile(Mission mission) {
+        if (checkInvalidFile(mission)) return;
+
+        Intent intent = new Intent(Intent.ACTION_SEND);
+        intent.setType(resolveMimeType(mission));
+        intent.putExtra(Intent.EXTRA_STREAM, mission.storage.getUri());
+
+        mContext.startActivity(Intent.createChooser(intent, null));
+    }
+
+    private static String resolveMimeType(@NonNull Mission mission) {
+        String mimeType;
+
+        if (!mission.storage.isInvalid()) {
+            mimeType = mission.storage.getType();
+            if (mimeType != null && mimeType.length() > 0 && !mimeType.equals(StoredFileHelper.DEFAULT_MIME))
+                return mimeType;
         }
 
+        String ext = Utility.getFileExt(mission.storage.getName());
+        if (ext == null) return DEFAULT_MIME_TYPE;
+
+        mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension(ext.substring(1));
+
+        return mimeType == null ? DEFAULT_MIME_TYPE : mimeType;
+    }
+
+    private boolean checkInvalidFile(@NonNull Mission mission) {
+        if (mission.storage.existsAsFile()) return false;
+
+        Toast.makeText(mContext, R.string.missing_file, Toast.LENGTH_SHORT).show();
         return true;
     }
 
@@ -343,15 +415,9 @@ public class MissionAdapter extends Adapter<ViewHolder> {
     }
 
     private void onServiceMessage(@NonNull Message msg) {
-        switch (msg.what) {
+        if (msg.what == DownloadManagerService.MESSAGE_PROGRESS) {
-            case DownloadManagerService.MESSAGE_PROGRESS:
+            setAutoRefresh(true);
-                setAutoRefresh(true);
+            return;
-                return;
-            case DownloadManagerService.MESSAGE_ERROR:
-            case DownloadManagerService.MESSAGE_FINISHED:
-                break;
-            default:
-                return;
         }
 
         for (int i = 0; i < mPendingDownloadsItems.size(); i++) {
@@ -370,74 +436,104 @@ public class MissionAdapter extends Adapter<ViewHolder> {
     }
 
     private void showError(@NonNull DownloadMission mission) {
-        StringBuilder str = new StringBuilder();
+        @StringRes int msg = R.string.general_error;
-        str.append(mContext.getString(R.string.label_code));
+        String msgEx = null;
-        str.append(": ");
-        str.append(mission.errCode);
-        str.append('\n');
 
         switch (mission.errCode) {
             case 416:
-                str.append(mContext.getString(R.string.error_http_requested_range_not_satisfiable));
+                msg = R.string.error_http_requested_range_not_satisfiable;
                 break;
             case 404:
-                str.append(mContext.getString(R.string.error_http_not_found));
+                msg = R.string.error_http_not_found;
                 break;
             case ERROR_NOTHING:
-                str.append("¿?");
+                return;// this never should happen
-                break;
             case ERROR_FILE_CREATION:
-                str.append(mContext.getString(R.string.error_file_creation));
+                msg = R.string.error_file_creation;
                 break;
             case ERROR_HTTP_NO_CONTENT:
-                str.append(mContext.getString(R.string.error_http_no_content));
+                msg = R.string.error_http_no_content;
                 break;
             case ERROR_HTTP_UNSUPPORTED_RANGE:
-                str.append(mContext.getString(R.string.error_http_unsupported_range));
+                msg = R.string.error_http_unsupported_range;
                 break;
             case ERROR_PATH_CREATION:
-                str.append(mContext.getString(R.string.error_path_creation));
+                msg = R.string.error_path_creation;
                 break;
             case ERROR_PERMISSION_DENIED:
-                str.append(mContext.getString(R.string.permission_denied));
+                msg = R.string.permission_denied;
                 break;
             case ERROR_SSL_EXCEPTION:
-                str.append(mContext.getString(R.string.error_ssl_exception));
+                msg = R.string.error_ssl_exception;
                 break;
             case ERROR_UNKNOWN_HOST:
-                str.append(mContext.getString(R.string.error_unknown_host));
+                msg = R.string.error_unknown_host;
                 break;
             case ERROR_CONNECT_HOST:
-                str.append(mContext.getString(R.string.error_connect_host));
+                msg = R.string.error_connect_host;
+                break;
+            case ERROR_POSTPROCESSING_STOPPED:
+                msg = R.string.error_postprocessing_stopped;
                 break;
             case ERROR_POSTPROCESSING:
-                str.append(mContext.getString(R.string.error_postprocessing_failed));
+            case ERROR_POSTPROCESSING_HOLD:
+                showError(mission.errObject, UserAction.DOWNLOAD_POSTPROCESSING, R.string.error_postprocessing_failed);
+                return;
+            case ERROR_INSUFFICIENT_STORAGE:
+                msg = R.string.error_insufficient_storage;
+                break;
             case ERROR_UNKNOWN_EXCEPTION:
+                showError(mission.errObject, UserAction.DOWNLOAD_FAILED, R.string.general_error);
+                return;
+            case ERROR_PROGRESS_LOST:
+                msg = R.string.error_progress_lost;
+                break;
+            case ERROR_TIMEOUT:
+                msg = R.string.error_timeout;
                 break;
             default:
                 if (mission.errCode >= 100 && mission.errCode < 600) {
-                    str = new StringBuilder(8);
+                    msgEx = "HTTP " + mission.errCode;
-                    str.append("HTTP ");
-                    str.append(mission.errCode);
                 } else if (mission.errObject == null) {
-                    str.append("(not_decelerated_error_code)");
+                    msgEx = "(not_decelerated_error_code)";
+                } else {
+                    showError(mission.errObject, UserAction.DOWNLOAD_FAILED, msg);
+                    return;
                 }
                 break;
         }
 
-        if (mission.errObject != null) {
+        AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
-            str.append("\n\n");
+
-            str.append(mission.errObject.toString());
+        if (msgEx != null)
+            builder.setMessage(msgEx);
+        else
+            builder.setMessage(msg);
+
+        // add report button for non-HTTP errors (range 100-599)
+        if (mission.errObject != null && (mission.errCode < 100 || mission.errCode >= 600)) {
+            @StringRes final int mMsg = msg;
+            builder.setPositiveButton(R.string.error_report_title, (dialog, which) ->
+                    showError(mission.errObject, UserAction.DOWNLOAD_FAILED, mMsg)
+            );
         }
 
-        AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
+        builder.setNegativeButton(android.R.string.ok, (dialog, which) -> dialog.cancel())
-        builder.setTitle(mission.name)
+                .setTitle(mission.storage.getName())
-                .setMessage(str)
-                .setNegativeButton(android.R.string.ok, (dialog, which) -> dialog.cancel())
                 .create()
                 .show();
     }
 
+    private void showError(Exception exception, UserAction action, @StringRes int reason) {
+        ErrorActivity.reportError(
+                mContext,
+                Collections.singletonList(exception),
+                null,
+                null,
+                ErrorActivity.ErrorInfo.make(action, "-", "-", reason)
+        );
+    }
+
     public void clearFinishedDownloads() {
         mDownloadManager.forgetFinishedDownloads();
         applyChanges();
@@ -466,16 +562,33 @@ public class MissionAdapter extends Adapter<ViewHolder> {
                     showError(mission);
                     return true;
                 case R.id.queue:
-                    h.queue.setChecked(!h.queue.isChecked());
+                    boolean flag = !h.queue.isChecked();
-                    mission.enqueued = h.queue.isChecked();
+                    h.queue.setChecked(flag);
+                    mission.setEnqueued(flag);
                     updateProgress(h);
                     return true;
+                case R.id.retry:
+                    if (mission.hasInvalidStorage()) {
+                        mDownloadManager.tryRecover(mission);
+                        if (mission.storage.isInvalid())
+                            mRecover.tryRecover(mission);
+                        else
+                            recoverMission(mission);
+
+                        return true;
+                    }
+                    mission.psContinue(true);
+                    return true;
+                case R.id.cancel:
+                    mission.psContinue(false);
+                    return false;
             }
         }
 
         switch (id) {
-            case R.id.open:
+            case R.id.menu_item_share:
-                return viewWithFileProvider(h.item.mission.getDownloadedFile());
+                shareFile(h.item.mission);
+                return true;
             case R.id.delete:
                 if (mDeleter == null) {
                     mDownloadManager.deleteMission(h.item.mission);
@@ -486,7 +599,7 @@ public class MissionAdapter extends Adapter<ViewHolder> {
                 return true;
             case R.id.md5:
             case R.id.sha1:
-                new ChecksumTask(mContext).execute(h.item.mission.getDownloadedFile().getAbsolutePath(), ALGORITHMS.get(id));
+                new ChecksumTask(mContext).execute(h.item.mission.storage, ALGORITHMS.get(id));
                 return true;
             case R.id.source:
                 /*Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(h.item.mission.source));
@@ -529,29 +642,74 @@ public class MissionAdapter extends Adapter<ViewHolder> {
     }
 
     public void setClearButton(MenuItem clearButton) {
-        if (mClear == null) clearButton.setVisible(mIterator.hasFinishedMissions());
+        if (mClear == null)
+            clearButton.setVisible(mIterator.hasFinishedMissions());
+
         mClear = clearButton;
     }
 
+    public void setMasterButtons(MenuItem startButton, MenuItem pauseButton) {
+        boolean init = mStartButton == null || mPauseButton == null;
+
+        mStartButton = startButton;
+        mPauseButton = pauseButton;
+
+        if (init) checkMasterButtonsVisibility();
+    }
+
     private void checkEmptyMessageVisibility() {
         int flag = mIterator.getOldListSize() > 0 ? View.GONE : View.VISIBLE;
         if (mEmptyMessage.getVisibility() != flag) mEmptyMessage.setVisibility(flag);
     }
 
+    private void checkMasterButtonsVisibility() {
+        boolean[] state = mIterator.hasValidPendingMissions();
 
-    public void deleterDispose(Bundle bundle) {
+        mStartButton.setVisible(state[0]);
-        if (mDeleter != null) mDeleter.dispose(bundle);
+        mPauseButton.setVisible(state[1]);
     }
 
-    public void deleterLoad(Bundle bundle, View view) {
+    public void ensurePausedMissions() {
+        for (ViewHolderItem h : mPendingDownloadsItems) {
+            if (((DownloadMission) h.item.mission).running) continue;
+            updateProgress(h);
+            h.lastTimeStamp = -1;
+            h.lastDone = -1;
+        }
+    }
+
+
+    public void deleterDispose(boolean commitChanges) {
+        if (mDeleter != null) mDeleter.dispose(commitChanges);
+    }
+
+    public void deleterLoad(View view) {
         if (mDeleter == null)
-            mDeleter = new Deleter(bundle, view, mContext, this, mDownloadManager, mIterator, mHandler);
+            mDeleter = new Deleter(view, mContext, this, mDownloadManager, mIterator, mHandler);
     }
 
     public void deleterResume() {
         if (mDeleter != null) mDeleter.resume();
     }
 
+    public void recoverMission(DownloadMission mission) {
+        for (ViewHolderItem h : mPendingDownloadsItems) {
+            if (mission != h.item.mission) continue;
+
+            mission.errObject = null;
+            mission.resetState(true, false, DownloadMission.ERROR_NOTHING);
+
+            h.status.setText(UNDEFINED_PROGRESS);
+            h.state = -1;
+            h.size.setText(Utility.formatBytes(mission.getLength()));
+            h.progress.setMarquee(true);
+
+            mDownloadManager.resumeMission(mission);
+            return;
+        }
+
+    }
+
 
     private boolean mUpdaterRunning = false;
     private final Runnable rUpdater = this::updater;
@@ -593,6 +751,10 @@ public class MissionAdapter extends Adapter<ViewHolder> {
         return Float.isNaN(value) || Float.isInfinite(value);
     }
 
+    public void setRecover(@NonNull RecoverHelper callback) {
+        mRecover = callback;
+    }
+
 
     class ViewHolderItem extends RecyclerView.ViewHolder {
         DownloadManager.MissionItem item;
@@ -604,6 +766,8 @@ public class MissionAdapter extends Adapter<ViewHolder> {
         ProgressDrawable progress;
 
         PopupMenu popupMenu;
+        MenuItem retry;
+        MenuItem cancel;
         MenuItem start;
         MenuItem pause;
         MenuItem open;
@@ -636,22 +800,34 @@ public class MissionAdapter extends Adapter<ViewHolder> {
             button.setOnClickListener(v -> showPopupMenu());
 
             Menu menu = popupMenu.getMenu();
+            retry = menu.findItem(R.id.retry);
+            cancel = menu.findItem(R.id.cancel);
             start = menu.findItem(R.id.start);
             pause = menu.findItem(R.id.pause);
-            open = menu.findItem(R.id.open);
+            open = menu.findItem(R.id.menu_item_share);
             queue = menu.findItem(R.id.queue);
             showError = menu.findItem(R.id.error_message_view);
             delete = menu.findItem(R.id.delete);
             source = menu.findItem(R.id.source);
             checksum = menu.findItem(R.id.checksum);
 
-            itemView.setOnClickListener((v) -> {
+            itemView.setHapticFeedbackEnabled(true);
+
+            itemView.setOnClickListener(v -> {
                 if (item.mission instanceof FinishedMission)
-                    viewWithFileProvider(item.mission.getDownloadedFile());
+                    viewWithFileProvider(item.mission);
+            });
+
+            itemView.setOnLongClickListener(v -> {
+                v.performHapticFeedback(HapticFeedbackConstants.LONG_PRESS);
+                showPopupMenu();
+                return true;
             });
         }
 
         private void showPopupMenu() {
+            retry.setVisible(false);
+            cancel.setVisible(false);
             start.setVisible(false);
             pause.setVisible(false);
             open.setVisible(false);
@@ -664,7 +840,20 @@ public class MissionAdapter extends Adapter<ViewHolder> {
             DownloadMission mission = item.mission instanceof DownloadMission ? (DownloadMission) item.mission : null;
 
             if (mission != null) {
-                if (!mission.isPsRunning()) {
+                if (mission.hasInvalidStorage()) {
+                    retry.setVisible(true);
+                    delete.setVisible(true);
+                    showError.setVisible(true);
+                } else if (mission.isPsRunning()) {
+                    switch (mission.errCode) {
+                        case ERROR_INSUFFICIENT_STORAGE:
+                        case ERROR_POSTPROCESSING_HOLD:
+                            retry.setVisible(true);
+                            cancel.setVisible(true);
+                            showError.setVisible(true);
+                            break;
+                    }
+                } else {
                     if (mission.running) {
                         pause.setVisible(true);
                     } else {
@@ -713,7 +902,7 @@ public class MissionAdapter extends Adapter<ViewHolder> {
     }
 
 
-    static class ChecksumTask extends AsyncTask<String, Void, String> {
+    static class ChecksumTask extends AsyncTask<Object, Void, String> {
         ProgressDialog progressDialog;
         WeakReference<Activity> weakReference;
 
@@ -736,8 +925,8 @@ public class MissionAdapter extends Adapter<ViewHolder> {
         }
 
         @Override
-        protected String doInBackground(String... params) {
+        protected String doInBackground(Object... params) {
-            return Utility.checksum(params[0], params[1]);
+            return Utility.checksum((StoredFileHelper) params[0], (String) params[1]);
         }
 
         @Override
@@ -764,4 +953,8 @@ public class MissionAdapter extends Adapter<ViewHolder> {
         }
     }
 
+    public interface RecoverHelper {
+        void tryRecover(DownloadMission mission);
+    }
+
 }

app/src/main/java/us/shandian/giga/ui/common/Deleter.java

@@ -3,8 +3,6 @@ package us.shandian.giga.ui.common;
 import android.content.Context;
 import android.content.Intent;
 import android.graphics.Color;
-import android.net.Uri;
-import android.os.Bundle;
 import android.os.Handler;
 import android.support.design.widget.Snackbar;
 import android.view.View;
@@ -23,8 +21,6 @@ public class Deleter {
     private static final int TIMEOUT = 5000;// ms
     private static final int DELAY = 350;// ms
     private static final int DELAY_RESUME = 400;// ms
-    private static final String BUNDLE_NAMES = "us.shandian.giga.ui.common.deleter.names";
-    private static final String BUNDLE_LOCATIONS = "us.shandian.giga.ui.common.deleter.locations";
 
     private Snackbar snackbar;
     private ArrayList<Mission> items;
@@ -41,7 +37,7 @@ public class Deleter {
     private final Runnable rNext;
     private final Runnable rCommit;
 
-    public Deleter(Bundle b, View v, Context c, MissionAdapter a, DownloadManager d, MissionIterator i, Handler h) {
+    public Deleter(View v, Context c, MissionAdapter a, DownloadManager d, MissionIterator i, Handler h) {
         mView = v;
         mContext = c;
         mAdapter = a;
@@ -55,27 +51,6 @@ public class Deleter {
         rCommit = this::commit;
 
         items = new ArrayList<>(2);
-
-        if (b != null) {
-            String[] names = b.getStringArray(BUNDLE_NAMES);
-            String[] locations = b.getStringArray(BUNDLE_LOCATIONS);
-
-            if (names == null || locations == null) return;
-            if (names.length < 1 || locations.length < 1) return;
-            if (names.length != locations.length) return;
-
-            items.ensureCapacity(names.length);
-
-            for (int j = 0; j < locations.length; j++) {
-                Mission mission = mDownloadManager.getAnyMission(locations[j], names[j]);
-                if (mission == null) continue;
-
-                items.add(mission);
-                mIterator.hide(mission);
-            }
-
-            if (items.size() > 0) resume();
-        }
     }
 
     public void append(Mission item) {
@@ -104,7 +79,7 @@ public class Deleter {
     private void next() {
         if (items.size() < 1) return;
 
-        String msg = mContext.getString(R.string.file_deleted).concat(":\n").concat(items.get(0).name);
+        String msg = mContext.getString(R.string.file_deleted).concat(":\n").concat(items.get(0).storage.getName());
 
         snackbar = Snackbar.make(mView, msg, Snackbar.LENGTH_INDEFINITE);
         snackbar.setAction(R.string.undo, s -> forget());
@@ -125,7 +100,7 @@ public class Deleter {
             mDownloadManager.deleteMission(mission);
 
             if (mission instanceof FinishedMission) {
-                mContext.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.fromFile(mission.getDownloadedFile())));
+                mContext.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, mission.storage.getUri()));
             }
             break;
         }
@@ -151,27 +126,14 @@ public class Deleter {
         mHandler.postDelayed(rShow, DELAY_RESUME);
     }
 
-    public void dispose(Bundle bundle) {
+    public void dispose(boolean commitChanges) {
         if (items.size() < 1) return;
 
         pause();
 
-        if (bundle == null) {
+        if (!commitChanges) return;
-            for (Mission mission : items) mDownloadManager.deleteMission(mission);
-            items = null;
-            return;
-        }
 
-        String[] names = new String[items.size()];
+        for (Mission mission : items) mDownloadManager.deleteMission(mission);
-        String[] locations = new String[items.size()];
+        items = null;
-
-        for (int i = 0; i < items.size(); i++) {
-            Mission mission = items.get(i);
-            names[i] = mission.name;
-            locations[i] = mission.location;
-        }
-
-        bundle.putStringArray(BUNDLE_NAMES, names);
-        bundle.putStringArray(BUNDLE_LOCATIONS, locations);
     }
 }

app/src/main/java/us/shandian/giga/ui/fragment/MissionsFragment.java

@@ -1,7 +1,7 @@
 package us.shandian.giga.ui.fragment;
 
 import android.app.Activity;
-import android.app.Fragment;
+import android.app.AlertDialog;
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
@@ -10,6 +10,8 @@ import android.content.SharedPreferences;
 import android.os.Bundle;
 import android.os.IBinder;
 import android.preference.PreferenceManager;
+import android.support.annotation.NonNull;
+import android.support.v4.app.Fragment;
 import android.support.v7.widget.GridLayoutManager;
 import android.support.v7.widget.LinearLayoutManager;
 import android.support.v7.widget.RecyclerView;
@@ -18,23 +20,31 @@ import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.Toast;
 
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.util.ThemeHelper;
 
+import java.io.IOException;
+
+import us.shandian.giga.get.DownloadMission;
+import us.shandian.giga.io.StoredFileHelper;
 import us.shandian.giga.service.DownloadManager;
 import us.shandian.giga.service.DownloadManagerService;
-import us.shandian.giga.service.DownloadManagerService.DMBinder;
+import us.shandian.giga.service.DownloadManagerService.DownloadManagerBinder;
 import us.shandian.giga.ui.adapter.MissionAdapter;
 
 public class MissionsFragment extends Fragment {
 
     private static final int SPAN_SIZE = 2;
+    private static final int REQUEST_DOWNLOAD_PATH_SAF = 0x1230;
 
     private SharedPreferences mPrefs;
     private boolean mLinear;
     private MenuItem mSwitch;
     private MenuItem mClear = null;
+    private MenuItem mStart = null;
+    private MenuItem mPause = null;
 
     private RecyclerView mList;
     private View mEmpty;
@@ -43,21 +53,24 @@ public class MissionsFragment extends Fragment {
     private LinearLayoutManager mLinearManager;
     private Context mContext;
 
-    private DMBinder mBinder;
+    private DownloadManagerBinder mBinder;
-    private Bundle mBundle;
     private boolean mForceUpdate;
 
+    private DownloadMission unsafeMissionTarget = null;
+
     private ServiceConnection mConnection = new ServiceConnection() {
 
         @Override
         public void onServiceConnected(ComponentName name, IBinder binder) {
-            mBinder = (DownloadManagerService.DMBinder) binder;
+            mBinder = (DownloadManagerBinder) binder;
             mBinder.clearDownloadNotifications();
 
-            mAdapter = new MissionAdapter(mContext, mBinder.getDownloadManager(), mClear, mEmpty);
+            mAdapter = new MissionAdapter(mContext, mBinder.getDownloadManager(), mEmpty);
-            mAdapter.deleterLoad(mBundle, getView());
+            mAdapter.deleterLoad(getView());
 
-            mBundle = null;
+            mAdapter.setRecover(MissionsFragment.this::recoverMission);
+
+            setAdapterButtons();
 
             mBinder.addMissionEventListener(mAdapter.getMessenger());
             mBinder.enableNotifications(false);
@@ -74,15 +87,12 @@ public class MissionsFragment extends Fragment {
     };
 
     @Override
-    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
         View v = inflater.inflate(R.layout.missions, container, false);
 
         mPrefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
         mLinear = mPrefs.getBoolean("linear", false);
 
-        //mContext = getActivity().getApplicationContext();
-        mBundle = savedInstanceState;
-
         // Bind the service
         mContext.bindService(new Intent(mContext, DownloadManagerService.class), mConnection, Context.BIND_AUTO_CREATE);
 
@@ -132,7 +142,7 @@ public class MissionsFragment extends Fragment {
     public void onAttach(Activity activity) {
         super.onAttach(activity);
 
-        mContext = activity.getApplicationContext();
+        mContext = activity;
     }
 
 
@@ -144,7 +154,7 @@ public class MissionsFragment extends Fragment {
         mBinder.removeMissionEventListener(mAdapter.getMessenger());
         mBinder.enableNotifications(true);
         mContext.unbindService(mConnection);
-        mAdapter.deleterDispose(null);
+        mAdapter.deleterDispose(true);
 
         mBinder = null;
         mAdapter = null;
@@ -154,7 +164,11 @@ public class MissionsFragment extends Fragment {
     public void onPrepareOptionsMenu(Menu menu) {
         mSwitch = menu.findItem(R.id.switch_mode);
         mClear = menu.findItem(R.id.clear_list);
-        if (mAdapter != null) mAdapter.setClearButton(mClear);
+        mStart = menu.findItem(R.id.start_downloads);
+        mPause = menu.findItem(R.id.pause_downloads);
+
+        if (mAdapter != null) setAdapterButtons();
+
         super.onPrepareOptionsMenu(menu);
     }
 
@@ -166,8 +180,23 @@ public class MissionsFragment extends Fragment {
                 updateList();
                 return true;
             case R.id.clear_list:
-                mAdapter.clearFinishedDownloads();
+                AlertDialog.Builder prompt = new AlertDialog.Builder(mContext);
+                prompt.setTitle(R.string.clear_finished_download);
+                prompt.setMessage(R.string.confirm_prompt);
+                prompt.setPositiveButton(android.R.string.ok, (dialog, which) -> mAdapter.clearFinishedDownloads());
+                prompt.setNegativeButton(R.string.cancel, null);
+                prompt.create().show();
                 return true;
+            case R.id.start_downloads:
+                item.setVisible(false);
+                mPause.setVisible(true);
+                mBinder.getDownloadManager().startAllMissions();
+                return true;
+            case R.id.pause_downloads:
+                item.setVisible(false);
+                mStart.setVisible(true);
+                mBinder.getDownloadManager().pauseAllMissions(false);
+                mAdapter.ensurePausedMissions();// update items view
             default:
                 return super.onOptionsItemSelected(item);
         }
@@ -193,9 +222,9 @@ public class MissionsFragment extends Fragment {
             int icon;
 
             if (mLinear)
-                icon = isLight ? R.drawable.ic_list_black_24dp : R.drawable.ic_list_white_24dp;
-            else
                 icon = isLight ? R.drawable.ic_grid_black_24dp : R.drawable.ic_grid_white_24dp;
+            else
+                icon = isLight ? R.drawable.ic_list_black_24dp : R.drawable.ic_list_white_24dp;
 
             mSwitch.setIcon(icon);
             mSwitch.setTitle(mLinear ? R.string.grid : R.string.list);
@@ -203,12 +232,29 @@ public class MissionsFragment extends Fragment {
         }
     }
 
+    private void setAdapterButtons() {
+        if (mClear == null || mStart == null || mPause == null) return;
+
+        mAdapter.setClearButton(mClear);
+        mAdapter.setMasterButtons(mStart, mPause);
+    }
+
+    private void recoverMission(@NonNull DownloadMission mission) {
+        unsafeMissionTarget = mission;
+        StoredFileHelper.requestSafWithFileCreation(
+                MissionsFragment.this,
+                REQUEST_DOWNLOAD_PATH_SAF,
+                mission.storage.getName(),
+                mission.storage.getType()
+        );
+    }
+
     @Override
-    public void onSaveInstanceState(Bundle outState) {
+    public void onSaveInstanceState(@NonNull Bundle outState) {
         super.onSaveInstanceState(outState);
 
         if (mAdapter != null) {
-            mAdapter.deleterDispose(outState);
+            mAdapter.deleterDispose(false);
             mForceUpdate = true;
             mBinder.removeMissionEventListener(mAdapter.getMessenger());
         }
@@ -237,4 +283,23 @@ public class MissionsFragment extends Fragment {
         if (mAdapter != null) mAdapter.onPaused();
         if (mBinder != null) mBinder.enableNotifications(true);
     }
+
+    @Override
+    public void onActivityResult(int requestCode, int resultCode, Intent data) {
+        super.onActivityResult(requestCode, resultCode, data);
+
+        if (requestCode != REQUEST_DOWNLOAD_PATH_SAF || resultCode != Activity.RESULT_OK) return;
+
+        if (unsafeMissionTarget == null || data.getData() == null) {
+            return;// unsafeMissionTarget cannot be null
+        }
+
+        try {
+            String tag = unsafeMissionTarget.storage.getTag();
+            unsafeMissionTarget.storage = new StoredFileHelper(mContext, null, data.getData(), tag);
+            mAdapter.recoverMission(unsafeMissionTarget);
+        } catch (IOException e) {
+            Toast.makeText(mContext, R.string.general_error, Toast.LENGTH_LONG).show();
+        }
+    }
 }

app/src/main/java/us/shandian/giga/util/Utility.java

@@ -9,14 +9,15 @@ import android.support.annotation.DrawableRes;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.support.v4.content.ContextCompat;
+import android.util.Log;
 import android.widget.Toast;
 
 import org.schabi.newpipe.R;
+import org.schabi.newpipe.streams.io.SharpStream;
 
 import java.io.BufferedOutputStream;
 import java.io.File;
 import java.io.FileInputStream;
-import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.ObjectInputStream;
@@ -25,7 +26,8 @@ import java.io.Serializable;
 import java.net.HttpURLConnection;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
-import java.util.Locale;
+
+import us.shandian.giga.io.StoredFileHelper;
 
 public class Utility {
 
@@ -80,6 +82,7 @@ public class Utility {
             objectInputStream = new ObjectInputStream(new FileInputStream(file));
             object = (T) objectInputStream.readObject();
         } catch (Exception e) {
+            Log.e("Utility", "Failed to deserialize the object", e);
             object = null;
         }
 
@@ -206,7 +209,7 @@ public class Utility {
         Toast.makeText(context, R.string.msg_copied, Toast.LENGTH_SHORT).show();
     }
 
-    public static String checksum(String path, String algorithm) {
+    public static String checksum(StoredFileHelper source, String algorithm) {
         MessageDigest md;
 
         try {
@@ -215,11 +218,11 @@ public class Utility {
             throw new RuntimeException(e);
         }
 
-        FileInputStream i;
+        SharpStream i;
 
         try {
-            i = new FileInputStream(path);
+            i = source.getStream();
-        } catch (FileNotFoundException e) {
+        } catch (Exception e) {
             throw new RuntimeException(e);
         }
 
@@ -247,15 +250,15 @@ public class Utility {
     }
 
     @SuppressWarnings("ResultOfMethodCallIgnored")
-    public static boolean mkdir(File path, boolean allDirs) {
+    public static boolean mkdir(File p, boolean allDirs) {
-        if (path.exists()) return true;
+        if (p.exists()) return true;
 
         if (allDirs)
-            path.mkdirs();
+            p.mkdirs();
         else
-            path.mkdir();
+            p.mkdir();
 
-        return path.exists();
+        return p.exists();
     }
 
     public static long getContentLength(HttpURLConnection connection) {
@@ -264,8 +267,7 @@ public class Utility {
         }
 
         try {
-            long length = Long.parseLong(connection.getHeaderField("Content-Length"));
+            return Long.parseLong(connection.getHeaderField("Content-Length"));
-            if (length >= 0) return length;
         } catch (Exception err) {
             // nothing to do
         }