Add chapter markers support to seekbar and update UI elements

app/src/main/java/org/schabi/newpipe/player/ui/VideoPlayerUi.java

@@ -65,7 +65,9 @@ import org.schabi.newpipe.databinding.PlayerBinding;
 import org.schabi.newpipe.extractor.MediaFormat;
 import org.schabi.newpipe.extractor.stream.AudioStream;
 import org.schabi.newpipe.extractor.stream.StreamInfo;
+import org.schabi.newpipe.extractor.stream.StreamSegment;
 import org.schabi.newpipe.extractor.stream.VideoStream;
+import org.schabi.newpipe.views.ChaptersSeekBar;
 import org.schabi.newpipe.fragments.detail.VideoDetailFragment;
 import org.schabi.newpipe.ktx.AnimationType;
 import org.schabi.newpipe.player.Player;
@@ -85,6 +87,7 @@ import org.schabi.newpipe.util.external_communication.KoreUtils;
 import org.schabi.newpipe.util.external_communication.ShareUtils;
 import org.schabi.newpipe.views.player.PlayerFastSeekOverlay;
 
+import java.util.Collections;
 import java.util.List;
 import java.util.Objects;
 import java.util.Optional;
@@ -147,6 +150,9 @@ public abstract class VideoPlayerUi extends PlayerUi implements SeekBar.OnSeekBa
     private final SeekbarPreviewThumbnailHolder seekbarPreviewThumbnailHolder =
             new SeekbarPreviewThumbnailHolder();
 
+    @NonNull
+    private List<StreamSegment> currentChapters = Collections.emptyList();
+
 
     /*//////////////////////////////////////////////////////////////////////////
     // Constructor, setup, destroy
@@ -589,6 +595,14 @@ public abstract class VideoPlayerUi extends PlayerUi implements SeekBar.OnSeekBa
                         binding.currentSeekbarPreviewThumbnail,
                         binding.subtitleView::getWidth);
 
+        // Chapter title tooltip
+        if (!currentChapters.isEmpty()) {
+            final StreamSegment chapter = getChapterAtMs(progress);
+            if (chapter != null && chapter.getTitle() != null) {
+                binding.currentChapterTitle.setText(chapter.getTitle());
+            }
+        }
+
         adjustSeekbarPreviewContainer();
     }
 
@@ -642,6 +656,10 @@ public abstract class VideoPlayerUi extends PlayerUi implements SeekBar.OnSeekBa
                 AnimationType.SCALE_AND_ALPHA);
         animate(binding.currentSeekbarPreviewThumbnail, true, DEFAULT_CONTROLS_DURATION,
                 AnimationType.SCALE_AND_ALPHA);
+        if (!currentChapters.isEmpty()) {
+            animate(binding.currentChapterTitle, true, DEFAULT_CONTROLS_DURATION,
+                    AnimationType.SCALE_AND_ALPHA);
+        }
     }
 
     @Override // seekbar listener
@@ -658,6 +676,7 @@ public abstract class VideoPlayerUi extends PlayerUi implements SeekBar.OnSeekBa
         binding.playbackCurrentTime.setText(getTimeString(seekBar.getProgress()));
         animate(binding.currentDisplaySeek, false, 200, AnimationType.SCALE_AND_ALPHA);
         animate(binding.currentSeekbarPreviewThumbnail, false, 200, AnimationType.SCALE_AND_ALPHA);
+        animate(binding.currentChapterTitle, false, 200, AnimationType.SCALE_AND_ALPHA);
 
         if (player.getCurrentState() == STATE_PAUSED_SEEK) {
             player.changeState(STATE_BUFFERING);
@@ -668,6 +687,25 @@ public abstract class VideoPlayerUi extends PlayerUi implements SeekBar.OnSeekBa
 
         showControlsThenHide();
     }
+
+    /**
+     * Returns the chapter active at the given playback position, or {@code null} if
+     * {@code currentChapters} is empty.
+     *
+     * @param positionMs playback position in milliseconds
+     * @return the {@link StreamSegment} whose window contains {@code positionMs}
+     */
+    @Nullable
+    private StreamSegment getChapterAtMs(final long positionMs) {
+        StreamSegment result = null;
+        for (final StreamSegment seg : currentChapters) {
+            if (seg.getStartTimeSeconds() * 1000L > positionMs) {
+                break;
+            }
+            result = seg;
+        }
+        return result;
+    }
     //endregion
 
 
@@ -1036,6 +1074,22 @@ public abstract class VideoPlayerUi extends PlayerUi implements SeekBar.OnSeekBa
         binding.channelTextView.setText(info.getUploaderName());
 
         this.seekbarPreviewThumbnailHolder.resetFrom(player.getContext(), info.getPreviewFrames());
+
+        // Chapter markers on seekbar
+        currentChapters = info.getStreamSegments() != null
+                ? info.getStreamSegments() : Collections.emptyList();
+        Log.d(TAG, "onMetadataChanged: seekBarClass="
+                + binding.playbackSeekBar.getClass().getSimpleName()
+                + " segments=" + currentChapters.size()
+                + " duration=" + info.getDuration());
+        if (binding.playbackSeekBar instanceof ChaptersSeekBar) {
+            ((ChaptersSeekBar) binding.playbackSeekBar)
+                    .setChapters(currentChapters, info.getDuration());
+        } else {
+            Log.e(TAG, "onMetadataChanged: playbackSeekBar is NOT a ChaptersSeekBar! "
+                    + "Check that player.xml was rebuilt.");
+        }
+        binding.currentChapterTitle.setVisibility(View.GONE);
     }
 
     private void updateStreamRelatedViews() {

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

@@ -33,7 +33,7 @@ import org.schabi.newpipe.util.DeviceUtils;
  * (onStartTrackingTouch/onStopTrackingTouch), so existing code does not need to be changed to
  * work with it.
   */
-public final class FocusAwareSeekBar extends AppCompatSeekBar {
+public class FocusAwareSeekBar extends AppCompatSeekBar {
     private NestedListener listener;
 
     private ViewTreeObserver treeObserver;

app/src/main/res/layout/player.xml

@@ -415,6 +415,23 @@
                     android:orientation="vertical"
                     android:paddingBottom="12dp">
 
+                    <org.schabi.newpipe.views.NewPipeTextView
+                        android:id="@+id/currentChapterTitle"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:background="#60000000"
+                        android:ellipsize="end"
+                        android:maxLines="1"
+                        android:paddingLeft="5dp"
+                        android:paddingRight="5dp"
+                        android:paddingBottom="2dp"
+                        android:textColor="@android:color/white"
+                        android:textSize="12sp"
+                        android:visibility="gone"
+                        tools:ignore="RtlHardcoded"
+                        tools:text="Introduction"
+                        tools:visibility="visible" />
+
                     <org.schabi.newpipe.views.NewPipeTextView
                         android:id="@+id/currentDisplaySeek"
                         android:layout_width="wrap_content"
@@ -467,7 +484,7 @@
                     tools:text="1:06:29" />
 
 
-                <org.schabi.newpipe.views.FocusAwareSeekBar
+                <org.schabi.newpipe.views.ChaptersSeekBar
                     android:id="@+id/playbackSeekBar"
                     style="@style/Widget.AppCompat.SeekBar"
                     android:layout_width="0dp"