Add Player.MetadataComponent for completeness

PiperOrigin-RevId: 225795581

extensions/cast/src/main/java/com/google/android/exoplayer2/ext/cast/CastPlayer.java

@@ -266,21 +266,30 @@ public final class CastPlayer extends BasePlayer {
   // Player implementation.
 
   @Override
+  @Nullable
   public AudioComponent getAudioComponent() {
     return null;
   }
 
   @Override
+  @Nullable
   public VideoComponent getVideoComponent() {
     return null;
   }
 
   @Override
+  @Nullable
   public TextComponent getTextComponent() {
     return null;
   }
 
   @Override
+  @Nullable
+  public MetadataComponent getMetadataComponent() {
+    return null;
+  }
+
+  @Override
   public Looper getApplicationLooper() {
     return Looper.getMainLooper();
   }

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

@@ -145,21 +145,30 @@ import java.util.concurrent.CopyOnWriteArrayList;
   }
 
   @Override
+  @Nullable
   public AudioComponent getAudioComponent() {
     return null;
   }
 
   @Override
+  @Nullable
   public VideoComponent getVideoComponent() {
     return null;
   }
 
   @Override
+  @Nullable
   public TextComponent getTextComponent() {
     return null;
   }
 
   @Override
+  @Nullable
+  public MetadataComponent getMetadataComponent() {
+    return null;
+  }
+
+  @Override
   public Looper getPlaybackLooper() {
     return internalPlayer.getPlaybackLooper();
   }

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

@@ -26,6 +26,7 @@ import com.google.android.exoplayer2.C.VideoScalingMode;
 import com.google.android.exoplayer2.audio.AudioAttributes;
 import com.google.android.exoplayer2.audio.AudioListener;
 import com.google.android.exoplayer2.audio.AuxEffectInfo;
+import com.google.android.exoplayer2.metadata.MetadataOutput;
 import com.google.android.exoplayer2.source.TrackGroupArray;
 import com.google.android.exoplayer2.text.TextOutput;
 import com.google.android.exoplayer2.trackselection.TrackSelectionArray;
@@ -299,6 +300,24 @@ public interface Player {
     void removeTextOutput(TextOutput listener);
   }
 
+  /** The metadata component of a {@link Player}. */
+  interface MetadataComponent {
+
+    /**
+     * Adds a {@link MetadataOutput} to receive metadata.
+     *
+     * @param output The output to register.
+     */
+    void addMetadataOutput(MetadataOutput output);
+
+    /**
+     * Removes a {@link MetadataOutput}.
+     *
+     * @param output The output to remove.
+     */
+    void removeMetadataOutput(MetadataOutput output);
+  }
+
   /**
    * Listener of changes in player state. All methods have no-op default implementations to allow
    * selective overrides.
@@ -534,6 +553,12 @@ public interface Player {
   TextComponent getTextComponent();
 
   /**
+   * Returns the component of this player for metadata output, or null if metadata is not supported.
+   */
+  @Nullable
+  MetadataComponent getMetadataComponent();
+
+  /**
    * Returns the {@link Looper} associated with the application thread that's used to access the
    * player and on which player events are received.
    */

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

@@ -65,7 +65,11 @@ import java.util.concurrent.CopyOnWriteArraySet;
  */
 @TargetApi(16)
 public class SimpleExoPlayer extends BasePlayer
-    implements ExoPlayer, Player.AudioComponent, Player.VideoComponent, Player.TextComponent {
+    implements ExoPlayer,
+        Player.AudioComponent,
+        Player.VideoComponent,
+        Player.TextComponent,
+        Player.MetadataComponent {
 
   /** @deprecated Use {@link com.google.android.exoplayer2.video.VideoListener}. */
   @Deprecated
@@ -243,20 +247,29 @@ public class SimpleExoPlayer extends BasePlayer
   }
 
   @Override
+  @Nullable
   public AudioComponent getAudioComponent() {
     return this;
   }
 
   @Override
+  @Nullable
   public VideoComponent getVideoComponent() {
     return this;
   }
 
   @Override
+  @Nullable
   public TextComponent getTextComponent() {
     return this;
   }
 
+  @Override
+  @Nullable
+  public MetadataComponent getMetadataComponent() {
+    return this;
+  }
+
   /**
    * Sets the video scaling mode.
    *
@@ -713,20 +726,12 @@ public class SimpleExoPlayer extends BasePlayer
     removeTextOutput(output);
   }
 
-  /**
-   * Adds a {@link MetadataOutput} to receive metadata.
-   *
-   * @param listener The output to register.
-   */
+  @Override
   public void addMetadataOutput(MetadataOutput listener) {
     metadataOutputs.add(listener);
   }
 
-  /**
-   * Removes a {@link MetadataOutput}.
-   *
-   * @param listener The output to remove.
-   */
+  @Override
   public void removeMetadataOutput(MetadataOutput listener) {
     metadataOutputs.remove(listener);
   }

testutils_robolectric/src/main/java/com/google/android/exoplayer2/testutil/StubExoPlayer.java

@@ -50,6 +50,11 @@ public abstract class StubExoPlayer extends BasePlayer implements ExoPlayer {
   }
 
   @Override
+  public MetadataComponent getMetadataComponent() {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
   public Looper getPlaybackLooper() {
     throw new UnsupportedOperationException();
   }