Fix issue caused by using ForwardingPlayer and StyledPlayerControlView

StyledPlayerControlView was checking whether the player is an ExoPlayer
instance to set the track selector. This means that, if apps were
wrapping an ExoPlayer in a ForwardingPlayer (to replace a
ControlDispatcher for example), the track selector wasn't set anymore.

#minor-release

PiperOrigin-RevId: 391776305

RELEASENOTES.md

@@ -9,6 +9,8 @@
         `com.google.android.exoplayer2.decoder.CryptoException`.
     *   Make `ExoPlayer.Builder` return a `SimpleExoPlayer` instance.
     *   Deprecate `SimpleExoPlayer.Builder`. Use `ExoPlayer.Builder` instead.
+    *   Fix track selection in `StyledPlayerControlView` when using
+        `ForwardingPlayer`.
 *   Android 12 compatibility:
     *   Disable platform transcoding when playing content URIs on Android 12.
     *   Add `ExoPlayer.setVideoChangeFrameRateStrategy` to allow disabling of

library/common/src/main/java/com/google/android/exoplayer2/ForwardingPlayer.java

@@ -619,6 +619,11 @@ public class ForwardingPlayer implements Player {
     player.setDeviceMuted(muted);
   }
 
+  /** Returns the {@link Player} to which operations are forwarded. */
+  public Player getWrappedPlayer() {
+    return player;
+  }
+
   @SuppressWarnings("deprecation") // Use of deprecated type for backwards compatibility.
   private static class ForwardingEventListener implements EventListener {
 

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

@@ -756,6 +756,9 @@ public class StyledPlayerControlView extends FrameLayout {
     if (player != null) {
       player.addListener(componentListener);
     }
+    if (player instanceof ForwardingPlayer) {
+      player = ((ForwardingPlayer) player).getWrappedPlayer();
+    }
     if (player instanceof ExoPlayer) {
       TrackSelector trackSelector = ((ExoPlayer) player).getTrackSelector();
       if (trackSelector instanceof DefaultTrackSelector) {