Prevent shutter closing for within-window seeks to unprepared periods

Issue: #5507
PiperOrigin-RevId: 315512207

RELEASENOTES.md

@@ -191,6 +191,10 @@
         ([#6926](https://github.com/google/ExoPlayer/issues/6926)).
         ([#6926](https://github.com/google/ExoPlayer/issues/6926)).
     *   Update `TrackSelectionDialogBuilder` to use AndroidX Compat Dialog
     *   Update `TrackSelectionDialogBuilder` to use AndroidX Compat Dialog
         ([#7357](https://github.com/google/ExoPlayer/issues/7357)).
         ([#7357](https://github.com/google/ExoPlayer/issues/7357)).
+    *   Prevent the video surface going black when seeking to an unprepared
+        period within the current window. For example when seeking over an ad
+        group, or to the next period in a multi-period DASH stream
+        ([#5507](https://github.com/google/ExoPlayer/issues/5507)).
 *   Metadata: Add minimal DVB Application Information Table (AIT) support
 *   Metadata: Add minimal DVB Application Information Table (AIT) support
     ([#6922](https://github.com/google/ExoPlayer/pull/6922)).
     ([#6922](https://github.com/google/ExoPlayer/pull/6922)).
 *   Cast extension: Implement playlist API and deprecate the old queue
 *   Cast extension: Implement playlist API and deprecate the old queue

library/ui/src/main/java/com/google/android/exoplayer2/ui/PlayerView.java

@@ -48,6 +48,8 @@ import com.google.android.exoplayer2.ExoPlaybackException;
 import com.google.android.exoplayer2.PlaybackPreparer;
 import com.google.android.exoplayer2.PlaybackPreparer;
 import com.google.android.exoplayer2.Player;
 import com.google.android.exoplayer2.Player;
 import com.google.android.exoplayer2.Player.DiscontinuityReason;
 import com.google.android.exoplayer2.Player.DiscontinuityReason;
+import com.google.android.exoplayer2.Timeline;
+import com.google.android.exoplayer2.Timeline.Period;
 import com.google.android.exoplayer2.metadata.Metadata;
 import com.google.android.exoplayer2.metadata.Metadata;
 import com.google.android.exoplayer2.metadata.flac.PictureFrame;
 import com.google.android.exoplayer2.metadata.flac.PictureFrame;
 import com.google.android.exoplayer2.metadata.id3.ApicFrame;
 import com.google.android.exoplayer2.metadata.id3.ApicFrame;
@@ -1554,6 +1556,13 @@ public class PlayerView extends FrameLayout implements AdsLoader.AdViewProvider
           SingleTapListener,
           SingleTapListener,
           PlayerControlView.VisibilityListener {
           PlayerControlView.VisibilityListener {
 
 
+    private final Period period;
+    private @Nullable Object lastPeriodUidWithTracks;
+
+    public ComponentListener() {
+      period = new Period();
+    }
+
     // TextOutput implementation
     // TextOutput implementation
 
 
     @Override
     @Override
@@ -1602,6 +1611,29 @@ public class PlayerView extends FrameLayout implements AdsLoader.AdViewProvider
 
 
     @Override
     @Override
     public void onTracksChanged(TrackGroupArray tracks, TrackSelectionArray selections) {
     public void onTracksChanged(TrackGroupArray tracks, TrackSelectionArray selections) {
+      // Suppress the update if transitioning to an unprepared period within the same window. This
+      // is necessary to avoid closing the shutter when such a transition occurs. See:
+      // https://github.com/google/ExoPlayer/issues/5507.
+      Player player = Assertions.checkNotNull(PlayerView.this.player);
+      Timeline timeline = player.getCurrentTimeline();
+      if (timeline.isEmpty()) {
+        lastPeriodUidWithTracks = null;
+      } else if (!player.getCurrentTrackGroups().isEmpty()) {
+        lastPeriodUidWithTracks =
+            timeline.getPeriod(player.getCurrentPeriodIndex(), period, /* setIds= */ true).uid;
+      } else if (lastPeriodUidWithTracks != null) {
+        int lastPeriodIndexWithTracks = timeline.getIndexOfPeriod(lastPeriodUidWithTracks);
+        if (lastPeriodIndexWithTracks != C.INDEX_UNSET) {
+          int lastWindowIndexWithTracks =
+              timeline.getPeriod(lastPeriodIndexWithTracks, period).windowIndex;
+          if (player.getCurrentWindowIndex() == lastWindowIndexWithTracks) {
+            // We're in the same window. Suppress the update.
+            return;
+          }
+        }
+        lastPeriodUidWithTracks = null;
+      }
+
       updateForCurrentTrackSelections(/* isNewPlayer= */ false);
       updateForCurrentTrackSelections(/* isNewPlayer= */ false);
     }
     }