Add getMediaItemCount() and getMediaItemAt(int)

PiperOrigin-RevId: 331211708

RELEASENOTES.md

@@ -2,6 +2,8 @@
 
 ### dev-v2 (not yet released)
 
+*   `Player`:
+    *   add `getMediaItemCount()` and `getMediaItemAt(int)`.
 *   Track selection:
     *   Add option to specify multiple preferred audio or text languages.
 *   Data sources:

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

@@ -185,6 +185,16 @@ public abstract class BasePlayer implements Player {
         : timeline.getWindow(getCurrentWindowIndex(), window).mediaItem;
   }
 
+  @Override
+  public int getMediaItemCount() {
+    return getCurrentTimeline().getWindowCount();
+  }
+
+  @Override
+  public MediaItem getMediaItemAt(int index) {
+    return getCurrentTimeline().getWindow(index, window).mediaItem;
+  }
+
   @Override
   @Nullable
   public final Object getCurrentManifest() {

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

@@ -1284,6 +1284,12 @@ public interface Player {
   @Nullable
   MediaItem getCurrentMediaItem();
 
+  /** Returns the number of {@link MediaItem media items} in the playlist. */
+  int getMediaItemCount();
+
+  /** Returns the {@link MediaItem} at the given index. */
+  MediaItem getMediaItemAt(int index);
+
   /**
    * Returns the duration of the current content window or ad in milliseconds, or {@link
    * C#TIME_UNSET} if the duration is not known.