Rename SourceInfoRefreshListener to MediaSourceCaller.

This better reflects its usage as a caller identifier and not just a listener.

PiperOrigin-RevId: 257827188

RELEASENOTES.md

@@ -15,9 +15,10 @@
 * Add VR player demo.
 * Wrap decoder exceptions in a new `DecoderException` class and report as
   renderer error.
-* Do not pass the manifest to callbacks of Player.EventListener and
-  SourceInfoRefreshListener anymore. Instead make it accessible through
-  Player.getCurrentManifest() and Timeline.Window.manifest.
+* Do not pass the manifest to callbacks of `Player.EventListener` and
+  `SourceInfoRefreshListener` anymore. Instead make it accessible through
+  `Player.getCurrentManifest()` and `Timeline.Window.manifest`. Also rename
+  `SourceInfoRefreshListener` to `MediaSourceCaller`.
 * Flac extension: Parse `VORBIS_COMMENT` metadata
   ([#5527](https://github.com/google/ExoPlayer/issues/5527)).
 

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

@@ -29,6 +29,7 @@ import com.google.android.exoplayer2.Player.DiscontinuityReason;
 import com.google.android.exoplayer2.source.MediaPeriod;
 import com.google.android.exoplayer2.source.MediaSource;
 import com.google.android.exoplayer2.source.MediaSource.MediaPeriodId;
+import com.google.android.exoplayer2.source.MediaSource.MediaSourceCaller;
 import com.google.android.exoplayer2.source.SampleStream;
 import com.google.android.exoplayer2.source.TrackGroupArray;
 import com.google.android.exoplayer2.trackselection.TrackSelection;
@@ -51,7 +52,7 @@ import java.util.concurrent.atomic.AtomicBoolean;
     implements Handler.Callback,
         MediaPeriod.Callback,
         TrackSelector.InvalidationListener,
-        MediaSource.SourceInfoRefreshListener,
+        MediaSourceCaller,
         PlaybackParameterListener,
         PlayerMessage.Sender {
 
@@ -264,7 +265,7 @@ import java.util.concurrent.atomic.AtomicBoolean;
     return internalPlaybackThread.getLooper();
   }
 
-  // MediaSource.SourceInfoRefreshListener implementation.
+  // MediaSource.MediaSourceCaller implementation.
 
   @Override
   public void onSourceInfoRefreshed(MediaSource source, Timeline timeline) {

library/core/src/main/java/com/google/android/exoplayer2/offline/DownloadHelper.java

@@ -31,6 +31,7 @@ import com.google.android.exoplayer2.drm.FrameworkMediaCrypto;
 import com.google.android.exoplayer2.source.MediaPeriod;
 import com.google.android.exoplayer2.source.MediaSource;
 import com.google.android.exoplayer2.source.MediaSource.MediaPeriodId;
+import com.google.android.exoplayer2.source.MediaSource.MediaSourceCaller;
 import com.google.android.exoplayer2.source.MediaSourceFactory;
 import com.google.android.exoplayer2.source.ProgressiveMediaSource;
 import com.google.android.exoplayer2.source.TrackGroup;
@@ -800,7 +801,7 @@ public final class DownloadHelper {
   }
 
   private static final class MediaPreparer
-      implements MediaSource.SourceInfoRefreshListener, MediaPeriod.Callback, Handler.Callback {
+      implements MediaSourceCaller, MediaPeriod.Callback, Handler.Callback {
 
     private static final int MESSAGE_PREPARE_SOURCE = 0;
     private static final int MESSAGE_CHECK_FOR_FAILURE = 1;
@@ -892,7 +893,7 @@ public final class DownloadHelper {
       }
     }
 
-    // MediaSource.SourceInfoRefreshListener implementation.
+    // MediaSource.MediaSourceCaller implementation.
 
     @Override
     public void onSourceInfoRefreshed(MediaSource source, Timeline timeline) {

library/core/src/main/java/com/google/android/exoplayer2/source/BaseMediaSource.java

@@ -32,14 +32,14 @@ import java.util.ArrayList;
  */
 public abstract class BaseMediaSource implements MediaSource {
 
-  private final ArrayList<SourceInfoRefreshListener> sourceInfoListeners;
+  private final ArrayList<MediaSourceCaller> mediaSourceCallers;
   private final MediaSourceEventListener.EventDispatcher eventDispatcher;
 
   @Nullable private Looper looper;
   @Nullable private Timeline timeline;
 
   public BaseMediaSource() {
-    sourceInfoListeners = new ArrayList<>(/* initialCapacity= */ 1);
+    mediaSourceCallers = new ArrayList<>(/* initialCapacity= */ 1);
     eventDispatcher = new MediaSourceEventListener.EventDispatcher();
   }
 
@@ -67,8 +67,8 @@ public abstract class BaseMediaSource implements MediaSource {
    */
   protected final void refreshSourceInfo(Timeline timeline) {
     this.timeline = timeline;
-    for (SourceInfoRefreshListener listener : sourceInfoListeners) {
-      listener.onSourceInfoRefreshed(/* source= */ this, timeline);
+    for (MediaSourceCaller caller : mediaSourceCallers) {
+      caller.onSourceInfoRefreshed(/* source= */ this, timeline);
     }
   }
 
@@ -127,23 +127,22 @@ public abstract class BaseMediaSource implements MediaSource {
 
   @Override
   public final void prepareSource(
-      SourceInfoRefreshListener listener,
-      @Nullable TransferListener mediaTransferListener) {
+      MediaSourceCaller caller, @Nullable TransferListener mediaTransferListener) {
     Looper looper = Looper.myLooper();
     Assertions.checkArgument(this.looper == null || this.looper == looper);
-    sourceInfoListeners.add(listener);
+    mediaSourceCallers.add(caller);
     if (this.looper == null) {
       this.looper = looper;
       prepareSourceInternal(mediaTransferListener);
     } else if (timeline != null) {
-      listener.onSourceInfoRefreshed(/* source= */ this, timeline);
+      caller.onSourceInfoRefreshed(/* source= */ this, timeline);
     }
   }
 
   @Override
-  public final void releaseSource(SourceInfoRefreshListener listener) {
-    sourceInfoListeners.remove(listener);
-    if (sourceInfoListeners.isEmpty()) {
+  public final void releaseSource(MediaSourceCaller caller) {
+    mediaSourceCallers.remove(caller);
+    if (mediaSourceCallers.isEmpty()) {
       looper = null;
       timeline = null;
       releaseSourceInternal();

library/core/src/main/java/com/google/android/exoplayer2/source/CompositeMediaSource.java

@@ -61,7 +61,7 @@ public abstract class CompositeMediaSource<T> extends BaseMediaSource {
   @CallSuper
   protected void releaseSourceInternal() {
     for (MediaSourceAndListener childSource : childSources.values()) {
-      childSource.mediaSource.releaseSource(childSource.listener);
+      childSource.mediaSource.releaseSource(childSource.caller);
       childSource.mediaSource.removeEventListener(childSource.eventListener);
     }
     childSources.clear();
@@ -91,17 +91,12 @@ public abstract class CompositeMediaSource<T> extends BaseMediaSource {
    */
   protected final void prepareChildSource(final T id, MediaSource mediaSource) {
     Assertions.checkArgument(!childSources.containsKey(id));
-    SourceInfoRefreshListener sourceListener =
-        new SourceInfoRefreshListener() {
-          @Override
-          public void onSourceInfoRefreshed(MediaSource source, Timeline timeline) {
-            onChildSourceInfoRefreshed(id, source, timeline);
-          }
-        };
+    MediaSourceCaller caller =
+        (source, timeline) -> onChildSourceInfoRefreshed(id, source, timeline);
     MediaSourceEventListener eventListener = new ForwardingEventListener(id);
-    childSources.put(id, new MediaSourceAndListener(mediaSource, sourceListener, eventListener));
+    childSources.put(id, new MediaSourceAndListener(mediaSource, caller, eventListener));
     mediaSource.addEventListener(Assertions.checkNotNull(eventHandler), eventListener);
-    mediaSource.prepareSource(sourceListener, mediaTransferListener);
+    mediaSource.prepareSource(caller, mediaTransferListener);
   }
 
   /**
@@ -111,7 +106,7 @@ public abstract class CompositeMediaSource<T> extends BaseMediaSource {
    */
   protected final void releaseChildSource(T id) {
     MediaSourceAndListener removedChild = Assertions.checkNotNull(childSources.remove(id));
-    removedChild.mediaSource.releaseSource(removedChild.listener);
+    removedChild.mediaSource.releaseSource(removedChild.caller);
     removedChild.mediaSource.removeEventListener(removedChild.eventListener);
   }
 
@@ -157,15 +152,13 @@ public abstract class CompositeMediaSource<T> extends BaseMediaSource {
   private static final class MediaSourceAndListener {
 
     public final MediaSource mediaSource;
-    public final SourceInfoRefreshListener listener;
+    public final MediaSourceCaller caller;
     public final MediaSourceEventListener eventListener;
 
     public MediaSourceAndListener(
-        MediaSource mediaSource,
-        SourceInfoRefreshListener listener,
-        MediaSourceEventListener eventListener) {
+        MediaSource mediaSource, MediaSourceCaller caller, MediaSourceEventListener eventListener) {
       this.mediaSource = mediaSource;
-      this.listener = listener;
+      this.caller = caller;
       this.eventListener = eventListener;
     }
   }

library/core/src/main/java/com/google/android/exoplayer2/source/MediaPeriod.java

@@ -20,6 +20,7 @@ import com.google.android.exoplayer2.ExoPlayer;
 import com.google.android.exoplayer2.SeekParameters;
 import com.google.android.exoplayer2.Timeline;
 import com.google.android.exoplayer2.offline.StreamKey;
+import com.google.android.exoplayer2.source.MediaSource.MediaSourceCaller;
 import com.google.android.exoplayer2.trackselection.TrackSelection;
 import java.io.IOException;
 import java.util.Collections;
@@ -57,8 +58,7 @@ public interface MediaPeriod extends SequenceableLoader {
    * {@link #maybeThrowPrepareError()} will throw an {@link IOException}.
    *
    * <p>If preparation succeeds and results in a source timeline change (e.g. the period duration
-   * becoming known), {@link
-   * MediaSource.SourceInfoRefreshListener#onSourceInfoRefreshed(MediaSource, Timeline)} will be
+   * becoming known), {@link MediaSourceCaller#onSourceInfoRefreshed(MediaSource, Timeline)} will be
    * called before {@code callback.onPrepared}.
    *
    * @param callback Callback to receive updates from this period, including being notified when

library/core/src/main/java/com/google/android/exoplayer2/source/MediaSource.java

@@ -30,9 +30,9 @@ import java.io.IOException;
  * <ul>
  *   <li>To provide the player with a {@link Timeline} defining the structure of its media, and to
  *       provide a new timeline whenever the structure of the media changes. The MediaSource
- *       provides these timelines by calling {@link SourceInfoRefreshListener#onSourceInfoRefreshed}
- *       on the {@link SourceInfoRefreshListener}s passed to {@link
- *       #prepareSource(SourceInfoRefreshListener, TransferListener)}.
+ *       provides these timelines by calling {@link MediaSourceCaller#onSourceInfoRefreshed} on the
+ *       {@link MediaSourceCaller}s passed to {@link #prepareSource(MediaSourceCaller,
+ *       TransferListener)}.
  *   <li>To provide {@link MediaPeriod} instances for the periods in its timeline. MediaPeriods are
  *       obtained by calling {@link #createPeriod(MediaPeriodId, Allocator, long)}, and provide a
  *       way for the player to load and read the media.
@@ -45,25 +45,21 @@ import java.io.IOException;
  */
 public interface MediaSource {
 
-  /** Listener for source events. */
-  interface SourceInfoRefreshListener {
+  /** A caller of media sources, which will be notified of source events. */
+  interface MediaSourceCaller {
 
     /**
-     * Called when the timeline has been refreshed.
+     * Called when the {@link Timeline} has been refreshed.
      *
      * <p>Called on the playback thread.
      *
      * @param source The {@link MediaSource} whose info has been refreshed.
      * @param timeline The source's timeline.
      */
-    default void onSourceInfoRefreshed(MediaSource source, Timeline timeline) {
-      // Do nothing.
-    }
+    void onSourceInfoRefreshed(MediaSource source, Timeline timeline);
   }
 
-  /**
-   * Identifier for a {@link MediaPeriod}.
-   */
+  /** Identifier for a {@link MediaPeriod}. */
   final class MediaPeriodId {
 
     /** The unique id of the timeline period. */
@@ -239,24 +235,23 @@ public interface MediaSource {
   }
 
   /**
-   * Starts source preparation.
+   * Registers a {@link MediaSourceCaller} and starts source preparation if needed.
    *
    * <p>Should not be called directly from application code.
    *
-   * <p>{@link SourceInfoRefreshListener#onSourceInfoRefreshed(MediaSource, Timeline)} will be
-   * called once the source has a {@link Timeline}.
+   * <p>{@link MediaSourceCaller#onSourceInfoRefreshed(MediaSource, Timeline)} will be called once
+   * the source has a {@link Timeline}.
    *
-   * <p>For each call to this method, a call to {@link #releaseSource(SourceInfoRefreshListener)} is
-   * needed to remove the listener and to release the source if no longer required.
+   * <p>For each call to this method, a call to {@link #releaseSource(MediaSourceCaller)} is needed
+   * to remove the caller and to release the source if no longer required.
    *
-   * @param listener The listener to be added.
+   * @param caller The {@link MediaSourceCaller} to be registered.
    * @param mediaTransferListener The transfer listener which should be informed of any media data
    *     transfers. May be null if no listener is available. Note that this listener should be only
    *     informed of transfers related to the media loads and not of auxiliary loads for manifests
    *     and other data.
    */
-  void prepareSource(
-      SourceInfoRefreshListener listener, @Nullable TransferListener mediaTransferListener);
+  void prepareSource(MediaSourceCaller caller, @Nullable TransferListener mediaTransferListener);
 
   /**
    * Throws any pending error encountered while loading or refreshing source information.
@@ -288,12 +283,11 @@ public interface MediaSource {
   void releasePeriod(MediaPeriod mediaPeriod);
 
   /**
-   * Removes a listener for timeline and/or manifest updates and releases the source if no longer
-   * required.
+   * Unregisters a caller and releases the source if no longer required.
    *
    * <p>Should not be called directly from application code.
    *
-   * @param listener The listener to be removed.
+   * @param caller The {@link MediaSourceCaller} to be unregistered.
    */
-  void releaseSource(SourceInfoRefreshListener listener);
+  void releaseSource(MediaSourceCaller caller);
 }

library/core/src/test/java/com/google/android/exoplayer2/source/ConcatenatingMediaSourceTest.java

@@ -26,7 +26,7 @@ import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.Player;
 import com.google.android.exoplayer2.Timeline;
 import com.google.android.exoplayer2.source.MediaSource.MediaPeriodId;
-import com.google.android.exoplayer2.source.MediaSource.SourceInfoRefreshListener;
+import com.google.android.exoplayer2.source.MediaSource.MediaSourceCaller;
 import com.google.android.exoplayer2.source.ShuffleOrder.DefaultShuffleOrder;
 import com.google.android.exoplayer2.testutil.DummyMainThread;
 import com.google.android.exoplayer2.testutil.FakeMediaSource;
@@ -628,15 +628,15 @@ public final class ConcatenatingMediaSourceTest {
     try {
       dummyMainThread.runOnMainThread(
           () -> {
-            SourceInfoRefreshListener listener = mock(SourceInfoRefreshListener.class);
+            MediaSourceCaller caller = mock(MediaSourceCaller.class);
             mediaSource.addMediaSources(Arrays.asList(createMediaSources(2)));
-            mediaSource.prepareSource(listener, /* mediaTransferListener= */ null);
+            mediaSource.prepareSource(caller, /* mediaTransferListener= */ null);
             mediaSource.moveMediaSource(
                 /* currentIndex= */ 0,
                 /* newIndex= */ 1,
                 new Handler(),
                 callbackCalledCondition::open);
-            mediaSource.releaseSource(listener);
+            mediaSource.releaseSource(caller);
           });
       assertThat(callbackCalledCondition.block(MediaSourceTestRunner.TIMEOUT_MS)).isTrue();
     } finally {

library/dash/src/main/java/com/google/android/exoplayer2/source/dash/DashMediaSource.java

@@ -366,8 +366,8 @@ public final class DashMediaSource extends BaseMediaSource {
 
   /**
    * The interval in milliseconds between invocations of {@link
-   * SourceInfoRefreshListener#onSourceInfoRefreshed(MediaSource, Timeline)} when the source's
-   * {@link Timeline} is changing dynamically (for example, for incomplete live streams).
+   * MediaSourceCaller#onSourceInfoRefreshed(MediaSource, Timeline)} when the source's {@link
+   * Timeline} is changing dynamically (for example, for incomplete live streams).
    */
   private static final int NOTIFY_MANIFEST_INTERVAL_MS = 5000;
   /**

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

@@ -28,6 +28,7 @@ import com.google.android.exoplayer2.Timeline;
 import com.google.android.exoplayer2.source.MediaPeriod;
 import com.google.android.exoplayer2.source.MediaSource;
 import com.google.android.exoplayer2.source.MediaSource.MediaPeriodId;
+import com.google.android.exoplayer2.source.MediaSource.MediaSourceCaller;
 import com.google.android.exoplayer2.source.MediaSourceEventListener;
 import com.google.android.exoplayer2.source.MediaSourceEventListener.LoadEventInfo;
 import com.google.android.exoplayer2.source.MediaSourceEventListener.MediaLoadData;
@@ -199,10 +200,7 @@ public class MediaSourceTestRunner {
     runOnPlaybackThread(() -> mediaSource.releasePeriod(mediaPeriod));
   }
 
-  /**
-   * Calls {@link MediaSource#releaseSource(MediaSource.SourceInfoRefreshListener)} on the playback
-   * thread.
-   */
+  /** Calls {@link MediaSource#releaseSource(MediaSourceCaller)} on the playback thread. */
   public void releaseSource() {
     runOnPlaybackThread(() -> mediaSource.releaseSource(mediaSourceListener));
   }
@@ -339,10 +337,9 @@ public class MediaSourceTestRunner {
     playbackThread.quit();
   }
 
-  private class MediaSourceListener
-      implements MediaSource.SourceInfoRefreshListener, MediaSourceEventListener {
+  private class MediaSourceListener implements MediaSourceCaller, MediaSourceEventListener {
 
-    // SourceInfoRefreshListener methods.
+    // MediaSourceCaller methods.
 
     @Override
     public void onSourceInfoRefreshed(MediaSource source, Timeline timeline) {