fixed: player caption auto-selection not reflected in gui.

fixed: player caption selection skipping on multiple language variants.

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

@@ -62,7 +62,6 @@ import static org.schabi.newpipe.player.helper.PlayerHelper.savePlaybackParamete
 import static org.schabi.newpipe.util.ListHelper.getPopupResolutionIndex;
 import static org.schabi.newpipe.util.ListHelper.getResolutionIndex;
 import static org.schabi.newpipe.util.Localization.assureCorrectAppLanguage;
-import static org.schabi.newpipe.util.Localization.containsCaseInsensitive;
 import static java.util.concurrent.TimeUnit.MILLISECONDS;
 
 import android.animation.Animator;
@@ -130,6 +129,7 @@ import androidx.recyclerview.widget.RecyclerView;
 import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.DefaultRenderersFactory;
 import com.google.android.exoplayer2.ExoPlayer;
+import com.google.android.exoplayer2.Format;
 import com.google.android.exoplayer2.PlaybackException;
 import com.google.android.exoplayer2.PlaybackParameters;
 import com.google.android.exoplayer2.Player.PositionInfo;
@@ -138,7 +138,6 @@ import com.google.android.exoplayer2.Timeline;
 import com.google.android.exoplayer2.TracksInfo;
 import com.google.android.exoplayer2.source.MediaSource;
 import com.google.android.exoplayer2.source.TrackGroup;
-import com.google.android.exoplayer2.source.TrackGroupArray;
 import com.google.android.exoplayer2.text.Cue;
 import com.google.android.exoplayer2.trackselection.DefaultTrackSelector;
 import com.google.android.exoplayer2.trackselection.MappingTrackSelector;
@@ -2530,7 +2529,7 @@ public final class Player implements
             Log.d(TAG, "ExoPlayer - onTracksChanged(), "
                     + "track group size = " + tracksInfo.getTrackGroupInfos().size());
         }
-        onTextTracksChanged();
+        onTextTracksChanged(tracksInfo);
     }
 
     @Override
@@ -3516,17 +3515,7 @@ public final class Player implements
             return;
         }
         captionPopupMenu.getMenu().removeGroup(POPUP_MENU_ID_CAPTION);
-
+        captionPopupMenu.setOnDismissListener(this);
-        final String userPreferredLanguage =
-                prefs.getString(context.getString(R.string.caption_user_set_key), null);
-        /*
-         * only search for autogenerated cc as fallback
-         * if "(auto-generated)" was not already selected
-         * we are only looking for "(" instead of "(auto-generated)" to hopefully get all
-         * internationalized variants such as "(automatisch-erzeugt)" and so on
-         */
-        boolean searchForAutogenerated = userPreferredLanguage != null
-                && !userPreferredLanguage.contains("(");
 
         // Add option for turning off caption
         final MenuItem captionOffItem = captionPopupMenu.getMenu().add(POPUP_MENU_ID_CAPTION,
@@ -3549,6 +3538,9 @@ public final class Player implements
             captionItem.setOnMenuItemClickListener(menuItem -> {
                 final int textRendererIndex = getCaptionRendererIndex();
                 if (textRendererIndex != RENDERER_UNAVAILABLE) {
+                    // DefaultTrackSelector will select for tracks with similar language names
+                    // if a track of userPreferredLanguage is not found
+                    // This means (auto-generated) will be resolved automatically.
                     trackSelector.setParameters(trackSelector.buildUponParameters()
                             .setPreferredTextLanguage(captionLanguage)
                             .setRendererDisabled(textRendererIndex, false));
@@ -3557,22 +3549,23 @@ public final class Player implements
                 }
                 return true;
             });
-            // apply caption language from previous user preference
-            if (userPreferredLanguage != null
-                    && (captionLanguage.equals(userPreferredLanguage)
-                    || (searchForAutogenerated && captionLanguage.startsWith(userPreferredLanguage))
-                    || (userPreferredLanguage.contains("(") && captionLanguage.startsWith(
-                    userPreferredLanguage.substring(0, userPreferredLanguage.indexOf('(')))))) {
-                final int textRendererIndex = getCaptionRendererIndex();
-                if (textRendererIndex != RENDERER_UNAVAILABLE) {
-                    trackSelector.setParameters(trackSelector.buildUponParameters()
-                            .setPreferredTextLanguage(captionLanguage)
-                            .setRendererDisabled(textRendererIndex, false));
-                }
-                searchForAutogenerated = false;
-            }
         }
-        captionPopupMenu.setOnDismissListener(this);
+
+        // apply caption language from previous user preference
+        final List<String> selectedPreferredLanguages =
+                trackSelector.getParameters().preferredTextLanguages;
+        final String userPreferredLanguage =
+                prefs.getString(context.getString(R.string.caption_user_set_key), null);
+        final int textRendererIndex = getCaptionRendererIndex();
+
+        if (userPreferredLanguage != null
+                && availableLanguages.contains(userPreferredLanguage)
+                && !selectedPreferredLanguages.contains(userPreferredLanguage)
+                && textRendererIndex != RENDERER_UNAVAILABLE) {
+            trackSelector.setParameters(trackSelector.buildUponParameters()
+                    .setPreferredTextLanguage(userPreferredLanguage)
+                    .setRendererDisabled(textRendererIndex, false));
+        }
     }
 
     /**
@@ -3668,41 +3661,45 @@ public final class Player implements
         binding.subtitleView.setStyle(captionStyle);
     }
 
-    private void onTextTracksChanged() {
+    private void onTextTracksChanged(@NonNull final TracksInfo currentTrackInfo) {
-        final int textRenderer = getCaptionRendererIndex();
-
         if (binding == null) {
             return;
         }
+
         if (trackSelector.getCurrentMappedTrackInfo() == null
-                || textRenderer == RENDERER_UNAVAILABLE) {
+                || !currentTrackInfo.isTypeSupportedOrEmpty(C.TRACK_TYPE_TEXT)) {
             binding.captionTextView.setVisibility(View.GONE);
             return;
         }
 
-        final TrackGroupArray textTracks = trackSelector.getCurrentMappedTrackInfo()
-                .getTrackGroups(textRenderer);
-
         // Extract all loaded languages
-        final List<String> availableLanguages = new ArrayList<>(textTracks.length);
+        final List<TracksInfo.TrackGroupInfo> textTracks = currentTrackInfo
-        for (int i = 0; i < textTracks.length; i++) {
+                .getTrackGroupInfos()
-            final TrackGroup textTrack = textTracks.get(i);
+                .stream()
+                .filter(trackGroupInfo -> C.TRACK_TYPE_TEXT == trackGroupInfo.getTrackType())
+                .collect(Collectors.toList());
+        final List<String> availableLanguages = new ArrayList<>(textTracks.size());
+        for (int i = 0; i < textTracks.size(); i++) {
+            final TrackGroup textTrack = textTracks.get(i).getTrackGroup();
             if (textTrack.length > 0) {
                 availableLanguages.add(textTrack.getFormat(0).language);
             }
         }
 
-        // Normalize mismatching language strings
+        // Find selected text track
-        final String preferredLanguage = trackSelector.getParameters()
+        final Optional<Format> selectedTracks = textTracks.stream()
-                .preferredTextLanguages.stream().findFirst().orElse(null);
+                .filter(TracksInfo.TrackGroupInfo::isSelected)
+                .filter(info -> info.getTrackGroup().length >= 1)
+                .map(info -> info.getTrackGroup().getFormat(0))
+                .findFirst();
+
         // Build UI
         buildCaptionMenu(availableLanguages);
-        if (trackSelector.getParameters().getRendererDisabled(textRenderer)
+        if (trackSelector.getParameters().getRendererDisabled(getCaptionRendererIndex())
-                || preferredLanguage == null || (!availableLanguages.contains(preferredLanguage)
+                || !selectedTracks.isPresent()) {
-                && !containsCaseInsensitive(availableLanguages, preferredLanguage))) {
             binding.captionTextView.setText(R.string.caption_none);
         } else {
-            binding.captionTextView.setText(preferredLanguage);
+            binding.captionTextView.setText(selectedTracks.get().language);
         }
         binding.captionTextView.setVisibility(
                 availableLanguages.isEmpty() ? View.GONE : View.VISIBLE);