Wire up MediaMetricsListener and add configuration to disable it.

The listener will automatically forward diagnostics info to the
Android platform. ExoPlayer.Builder gets a new setter that allows
to disable this feature if required.

#minor-release

PiperOrigin-RevId: 426099872

RELEASENOTES.md

@@ -43,6 +43,15 @@
     *   Rename `DecoderCounters#inputBufferCount` to `queuedInputBufferCount`.
     *   Make `SimpleExoPlayer.renderers` private. Renderers can be accessed via
         `ExoPlayer.getRenderer`.
+    *   Enable support for Android platform diagnostics via
+        `MediaMetricsManager`. ExoPlayer will forward playback events and
+        performance data to the platform, which helps to provide system
+        performance and debugging information on the device. This data may also
+        be collected by Google
+        [if sharing usage and diagnostics data is enabled](https://support.google.com/accounts/answer/6078260)
+        by the user of the device. Apps can opt-out of contributing to platform
+        diagnostics for ExoPlayer with
+        `ExoPlayer.Builder.setUsePlatformDiagnostics(false)`.
 *   Android 12 compatibility:
     *   Upgrade the Cast extension to depend on
         `com.google.android.gms:play-services-cast-framework:20.1.0`. Earlier

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

@@ -389,6 +389,7 @@ public interface ExoPlayer extends Player {
     /* package */ long releaseTimeoutMs;
     /* package */ long detachSurfaceTimeoutMs;
     /* package */ boolean pauseAtEndOfMediaItems;
+    /* package */ boolean usePlatformDiagnostics;
     /* package */ boolean buildCalled;
 
     /**
@@ -429,6 +430,7 @@ public interface ExoPlayer extends Player {
      *   <li>{@code releaseTimeoutMs}: {@link #DEFAULT_RELEASE_TIMEOUT_MS}
      *   <li>{@code detachSurfaceTimeoutMs}: {@link #DEFAULT_DETACH_SURFACE_TIMEOUT_MS}
      *   <li>{@code pauseAtEndOfMediaItems}: {@code false}
+     *   <li>{@code usePlatformDiagnostics}: {@code true}
      *   <li>{@link Clock}: {@link Clock#DEFAULT}
      * </ul>
      *
@@ -577,6 +579,7 @@ public interface ExoPlayer extends Player {
       clock = Clock.DEFAULT;
       releaseTimeoutMs = DEFAULT_RELEASE_TIMEOUT_MS;
       detachSurfaceTimeoutMs = DEFAULT_DETACH_SURFACE_TIMEOUT_MS;
+      usePlatformDiagnostics = true;
     }
 
     /**
@@ -937,6 +940,27 @@ public interface ExoPlayer extends Player {
       return this;
     }
 
+    /**
+     * Sets whether the player reports diagnostics data to the Android platform.
+     *
+     * <p>If enabled, the player will use the {@link android.media.metrics.MediaMetricsManager} to
+     * create a {@link android.media.metrics.PlaybackSession} and forward playback events and
+     * performance data to this session. This helps to provide system performance and debugging
+     * information for media playback on the device. This data may also be collected by Google <a
+     * href="https://support.google.com/accounts/answer/6078260">if sharing usage and diagnostics
+     * data is enabled</a> by the user of the device.
+     *
+     * @param usePlatformDiagnostics Whether the player reports diagnostics data to the Android
+     *     platform.
+     * @return This builder.
+     * @throws IllegalStateException If {@link #build()} has already been called.
+     */
+    public Builder setUsePlatformDiagnostics(boolean usePlatformDiagnostics) {
+      checkState(!buildCalled);
+      this.usePlatformDiagnostics = usePlatformDiagnostics;
+      return this;
+    }
+
     /**
      * Sets the {@link Clock} that will be used by the player. Should only be set for testing
      * purposes.

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

@@ -110,6 +110,7 @@ import com.google.android.exoplayer2.PlayerMessage.Target;
 import com.google.android.exoplayer2.Renderer.MessageType;
 import com.google.android.exoplayer2.analytics.AnalyticsCollector;
 import com.google.android.exoplayer2.analytics.AnalyticsListener;
+import com.google.android.exoplayer2.analytics.MediaMetricsListener;
 import com.google.android.exoplayer2.analytics.PlayerId;
 import com.google.android.exoplayer2.audio.AudioAttributes;
 import com.google.android.exoplayer2.audio.AudioRendererEventListener;
@@ -359,7 +360,11 @@ import java.util.concurrent.TimeoutException;
               playbackInfoUpdateHandler.post(() -> handlePlaybackInfo(playbackInfoUpdate));
       playbackInfo = PlaybackInfo.createDummy(emptyTrackSelectorResult);
       analyticsCollector.setPlayer(wrappingPlayer, applicationLooper);
-      PlayerId playerId = Util.SDK_INT < 31 ? new PlayerId() : Api31.createPlayerId();
+      PlayerId playerId =
+          Util.SDK_INT < 31
+              ? new PlayerId()
+              : Api31.registerMediaMetricsListener(
+                  applicationContext, /* player= */ this, builder.usePlatformDiagnostics);
       internalPlayer =
           new ExoPlayerImplInternal(
               renderers,
@@ -3045,9 +3050,17 @@ import java.util.concurrent.TimeoutException;
     private Api31() {}
 
     @DoNotInline
-    public static PlayerId createPlayerId() {
+    public static PlayerId registerMediaMetricsListener(
-      // TODO: Create a MediaMetricsListener and obtain LogSessionId from it.
+        Context context, ExoPlayerImpl player, boolean usePlatformDiagnostics) {
+      @Nullable MediaMetricsListener listener = MediaMetricsListener.create(context);
+      if (listener == null) {
+        Log.w(TAG, "MediaMetricsService unavailable.");
         return new PlayerId(LogSessionId.LOG_SESSION_ID_NONE);
       }
+      if (usePlatformDiagnostics) {
+        player.addAnalyticsListener(listener);
+      }
+      return new PlayerId(listener.getLogSessionId());
+    }
   }
 }