Fix mediaMetadata being reset when media is repeated.

Issue: #9458
PiperOrigin-RevId: 399901865

RELEASENOTES.md

@@ -13,6 +13,8 @@
         `GlUtil.glAssertionsEnabled` instead.
         `GlUtil.glAssertionsEnabled` instead.
     *   Move `Player.addListener(EventListener)` and
     *   Move `Player.addListener(EventListener)` and
         `Player.removeListener(EventListener)` out of `Player` into subclasses.
         `Player.removeListener(EventListener)` out of `Player` into subclasses.
+    *   Fix `mediaMetadata` being reset when media is
+        repeated ([#9458](https://github.com/google/ExoPlayer/issues/9458)).
 *   Video:
 *   Video:
     *   Fix bug in `MediaCodecVideoRenderer` that resulted in re-using a
     *   Fix bug in `MediaCodecVideoRenderer` that resulted in re-using a
         released `Surface` when playing without an app-provided `Surface`
         released `Surface` when playing without an app-provided `Surface`

library/core/src/main/java/com/google/android/exoplayer2/ExoPlayerImpl.java

@@ -1219,7 +1219,8 @@ import java.util.concurrent.CopyOnWriteArraySet;
       }
       }
       newMediaMetadata = mediaItem != null ? mediaItem.mediaMetadata : MediaMetadata.EMPTY;
       newMediaMetadata = mediaItem != null ? mediaItem.mediaMetadata : MediaMetadata.EMPTY;
     }
     }
-    if (!previousPlaybackInfo.staticMetadata.equals(newPlaybackInfo.staticMetadata)) {
+    if (mediaItemTransitioned
+        || !previousPlaybackInfo.staticMetadata.equals(newPlaybackInfo.staticMetadata)) {
       newMediaMetadata =
       newMediaMetadata =
           newMediaMetadata.buildUpon().populateFromMetadata(newPlaybackInfo.staticMetadata).build();
           newMediaMetadata.buildUpon().populateFromMetadata(newPlaybackInfo.staticMetadata).build();
     }
     }