Merge pull request #336 from androidx/release-1.0.1-stable

1.0.1

.github/ISSUE_TEMPLATE/bug.yml

@@ -20,6 +20,7 @@ body:
       label: Media3 Version
       description: What version of Media3 (or ExoPlayer) are you using?
       options:
+        - Media3 1.0.1
         - Media3 1.0.0
         - Media3 1.0.0-rc02
         - Media3 1.0.0-rc01
@@ -29,6 +30,7 @@ body:
         - Media3 1.0.0-alpha03
         - Media3 1.0.0-alpha02
         - Media3 1.0.0-alpha01
+        - ExoPlayer 2.18.6
         - ExoPlayer 2.18.5
         - ExoPlayer 2.18.4
         - ExoPlayer 2.18.3

.github/ISSUE_TEMPLATE/question.md

@@ -36,7 +36,7 @@ In case your question is related to a piece of media:
   - Authentication HTTP headers
 
 Don't forget to check ExoPlayer's supported formats and devices, if applicable
-(https://exoplayer.dev/supported-formats.html).
+(https://developer.android.com/guide/topics/media/exoplayer/supported-formats).
 
 If there's something you don't want to post publicly, please submit the issue,
 then email the link/bug report to dev.exoplayer@gmail.com using a subject in the

CONTRIBUTING.md

@@ -23,6 +23,21 @@ We will also consider high quality pull requests. These should merge
 into the `main` branch. Before a pull request can be accepted you must submit
 a Contributor License Agreement, as described below.
 
+### Code style
+
+We follow the
+[Google Java Style Guide](https://google.github.io/styleguide/javaguide.html)
+and use [`google-java-format`](https://github.com/google/google-java-format) to
+automatically reformat the code. Please consider auto-formatting your changes
+before opening a PR (we will otherwise do this ourselves before merging). You
+can use the various IDE integrations available, or bulk-reformat all the changes
+you made on top of `main` using
+[`google-java-format-diff.py`](https://github.com/google/google-java-format/blob/master/scripts/google-java-format-diff.py):
+
+```shell
+$ git diff -U0 main... | google-java-format-diff.py -p1 -i
+```
+
 ## Contributor license agreement
 
 Contributions to any Google project must be accompanied by a Contributor

RELEASENOTES.md

@@ -1,5 +1,44 @@
 # Release notes
 
+### 1.0.1 (2023-04-18)
+
+This release corresponds to the
+[ExoPlayer 2.18.6 release](https://github.com/google/ExoPlayer/releases/tag/r2.18.6).
+
+*   Core library:
+    *   Reset target live stream override when seeking to default position
+        ([#11051](https://github.com/google/ExoPlayer/pull/11051)).
+    *   Fix bug where empty sample streams in the media could cause playback to
+        be stuck.
+*   Session:
+    *   Fix bug where multiple identical queue items published by a legacy
+        `MediaSessionCompat` result in an exception in `MediaController`
+        ([#290](https://github.com/androidx/media/issues/290)).
+    *   Add missing forwarding of `MediaSession.broadcastCustomCommand` to the
+        legacy `MediaControllerCompat.Callback.onSessionEvent`
+        ([#293](https://github.com/androidx/media/issues/293)).
+    *   Fix bug where calling `MediaSession.setPlayer` doesn't update the
+        available commands.
+    *   Fix issue that `TrackSelectionOverride` instances sent from a
+        `MediaController` are ignored if they reference a group with
+        `Format.metadata`
+        ([#296](https://github.com/androidx/media/issues/296)).
+    *   Fix issue where `Player.COMMAND_GET_CURRENT_MEDIA_ITEM` needs to be
+        available to access metadata via the legacy `MediaSessionCompat`.
+    *   Fix issue where `MediaSession` instances on a background thread cause
+        crashes when used in `MediaSessionService`
+        ([#318](https://github.com/androidx/media/issues/318)).
+    *   Fix issue where a media button receiver was declared by the library
+        without the app having intended this
+        ([#314](https://github.com/androidx/media/issues/314)).
+*   DASH:
+    *   Fix handling of empty segment timelines
+        ([#11014](https://github.com/google/ExoPlayer/issues/11014)).
+*   RTSP:
+    *   Retry with TCP if RTSP Setup with UDP fails with RTSP Error 461
+        UnsupportedTransport
+        ([#11069](https://github.com/google/ExoPlayer/issues/11069)).
+
 ### 1.0.0 (2023-03-22)
 
 This release corresponds to the

constants.gradle

@@ -12,8 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 project.ext {
-    releaseVersion = '1.0.0'
+    releaseVersion = '1.0.1'
-    releaseVersionCode = 1_000_000_3_00
+    releaseVersionCode = 1_000_001_3_00
     minSdkVersion = 16
     appTargetSdkVersion = 33
     // API version before restricting local file access.

demos/gl/build.gradle

@@ -27,6 +27,7 @@ android {
         versionCode project.ext.releaseVersionCode
         minSdkVersion project.ext.minSdkVersion
         targetSdkVersion project.ext.appTargetSdkVersion
+        multiDexEnabled true
     }
 
     buildTypes {

demos/main/src/main/res/values/strings.xml

@@ -21,7 +21,7 @@
 
   <string name="unexpected_intent_action">Unexpected intent action: <xliff:g id="action">%1$s</xliff:g></string>
 
-  <string name="error_cleartext_not_permitted">Cleartext HTTP traffic not permitted. See https://exoplayer.dev/issues/cleartext-not-permitted</string>
+  <string name="error_cleartext_not_permitted">Cleartext HTTP traffic not permitted. See https://developer.android.com/guide/topics/media/issues/cleartext-not-permitted</string>
 
   <string name="error_generic">Playback failed</string>
 

demos/session/src/main/java/androidx/media3/demo/session/MainActivity.kt

@@ -26,6 +26,7 @@ import android.view.ViewGroup
 import android.widget.ArrayAdapter
 import android.widget.ListView
 import android.widget.TextView
+import androidx.activity.OnBackPressedCallback
 import androidx.appcompat.app.AppCompatActivity
 import androidx.core.content.ContextCompat
 import androidx.media3.common.MediaItem
@@ -73,20 +74,24 @@ class MainActivity : AppCompatActivity() {
         val intent = Intent(this, PlayerActivity::class.java)
         startActivity(intent)
       }
+
+    onBackPressedDispatcher.addCallback(
+      object : OnBackPressedCallback(/* enabled= */ true) {
+        override fun handleOnBackPressed() {
+          popPathStack()
+        }
+      }
+    )
   }
 
   override fun onOptionsItemSelected(item: MenuItem): Boolean {
     if (item.itemId == android.R.id.home) {
-      onBackPressed()
+      onBackPressedDispatcher.onBackPressed()
       return true
     }
     return super.onOptionsItemSelected(item)
   }
 
-  override fun onBackPressed() {
-    popPathStack()
-  }
-
   override fun onStart() {
     super.onStart()
     initializeBrowser()

demos/session/src/main/java/androidx/media3/demo/session/PlayerActivity.kt

@@ -135,6 +135,7 @@ class PlayerActivity : AppCompatActivity() {
     updateMediaMetadataUI(controller.mediaMetadata)
     updateShuffleSwitchUI(controller.shuffleModeEnabled)
     updateRepeatSwitchUI(controller.repeatMode)
+    playerView.setShowSubtitleButton(controller.currentTracks.isTypeSupported(TRACK_TYPE_TEXT))
 
     controller.addListener(
       object : Player.Listener {

demos/transformer/README.md

@@ -61,6 +61,6 @@ manual steps.
     (this will only appear if the AAR is present), then build and run the demo
     app and select a MediaPipe-based effect.
 
-[Transformer]: https://exoplayer.dev/transforming-media.html
+[Transformer]: https://developer.android.com/guide/topics/media/transforming-media
 [MediaPipe]: https://google.github.io/mediapipe/
 [build an AAR]: https://google.github.io/mediapipe/getting_started/android_archive_library.html

demos/transformer/src/main/java/androidx/media3/demo/transformer/MatrixTransformationFactory.java

@@ -28,7 +28,7 @@ import androidx.media3.effect.MatrixTransformation;
  */
 /* package */ final class MatrixTransformationFactory {
   /**
-   * Returns a {@link MatrixTransformation} that rescales the frames over the first {@value
+   * Returns a {@link MatrixTransformation} that rescales the frames over the first {@link
    * #ZOOM_DURATION_SECONDS} seconds, such that the rectangle filled with the input frame increases
    * linearly in size from a single point to filling the full output frame.
    */

libraries/common/src/main/java/androidx/media3/common/AuxEffectInfo.java

@@ -52,12 +52,12 @@ public final class AuxEffectInfo {
    * Creates an instance with the given effect identifier and send level.
    *
    * @param effectId The effect identifier. This is the value returned by {@link
-   *     AudioEffect#getId()} on the effect, or {@value #NO_AUX_EFFECT_ID} which represents no
+   *     AudioEffect#getId()} on the effect, or {@link #NO_AUX_EFFECT_ID} which represents no
    *     effect. This value is passed to {@link AudioTrack#attachAuxEffect(int)} on the underlying
    *     audio track.
    * @param sendLevel The send level for the effect, where 0 represents no effect and a value of 1
-   *     is full send. If {@code effectId} is not {@value #NO_AUX_EFFECT_ID}, this value is passed
+   *     is full send. If {@code effectId} is not {@link #NO_AUX_EFFECT_ID}, this value is passed to
-   *     to {@link AudioTrack#setAuxEffectSendLevel(float)} on the underlying audio track.
+   *     {@link AudioTrack#setAuxEffectSendLevel(float)} on the underlying audio track.
    */
   public AuxEffectInfo(int effectId, float sendLevel) {
     this.effectId = effectId;

libraries/common/src/main/java/androidx/media3/common/Format.java

@@ -35,7 +35,8 @@ import java.util.UUID;
  *
  * <p>When building formats, populate all fields whose values are known and relevant to the type of
  * format being constructed. For information about different types of format, see ExoPlayer's <a
- * href="https://exoplayer.dev/supported-formats.html">Supported formats page</a>.
+ * href="https://developer.android.com/guide/topics/media/exoplayer/supported-formats">Supported
+ * formats page</a>.
  *
  * <h2>Fields commonly relevant to all formats</h2>
  *

libraries/common/src/main/java/androidx/media3/common/ForwardingPlayer.java

@@ -20,6 +20,7 @@ import android.view.Surface;
 import android.view.SurfaceHolder;
 import android.view.SurfaceView;
 import android.view.TextureView;
+import androidx.annotation.CallSuper;
 import androidx.annotation.Nullable;
 import androidx.media3.common.text.Cue;
 import androidx.media3.common.text.CueGroup;
@@ -47,14 +48,29 @@ public class ForwardingPlayer implements Player {
     return player.getApplicationLooper();
   }
 
-  /** Calls {@link Player#addListener(Listener)} on the delegate. */
+  /**
+   * Calls {@link Player#addListener(Listener)} on the delegate.
+   *
+   * <p>Overrides of this method must delegate to {@code super.addListener} and not {@code
+   * delegate.addListener}, in order to ensure the correct {@link Player} instance is passed to
+   * {@link Player.Listener#onEvents(Player, Events)} (i.e. this forwarding instance, and not the
+   * underlying {@code delegate} instance).
+   */
   @Override
+  @CallSuper
   public void addListener(Listener listener) {
     player.addListener(new ForwardingListener(this, listener));
   }
 
-  /** Calls {@link Player#removeListener(Listener)} on the delegate. */
+  /**
+   * Calls {@link Player#removeListener(Listener)} on the delegate.
+   *
+   * <p>Overrides of this method must delegate to {@code super.removeListener} and not {@code
+   * delegate.removeListener}, in order to ensure the listener 'matches' the listener added via
+   * {@link #addListener} (otherwise the listener registered on the delegate won't be removed).
+   */
   @Override
+  @CallSuper
   public void removeListener(Listener listener) {
     player.removeListener(new ForwardingListener(this, listener));
   }

libraries/common/src/main/java/androidx/media3/common/MediaLibraryInfo.java

@@ -29,11 +29,11 @@ public final class MediaLibraryInfo {
 
   /** The version of the library expressed as a string, for example "1.2.3" or "1.2.3-beta01". */
   // Intentionally hardcoded. Do not derive from other constants (e.g. VERSION_INT) or vice versa.
-  public static final String VERSION = "1.0.0";
+  public static final String VERSION = "1.0.1";
 
   /** The version of the library expressed as {@code TAG + "/" + VERSION}. */
   // Intentionally hardcoded. Do not derive from other constants (e.g. VERSION) or vice versa.
-  public static final String VERSION_SLASHY = "AndroidXMedia3/1.0.0";
+  public static final String VERSION_SLASHY = "AndroidXMedia3/1.0.1";
 
   /**
    * The version of the library expressed as an integer, for example 1002003300.
@@ -47,7 +47,7 @@ public final class MediaLibraryInfo {
    * (123-045-006-3-00).
    */
   // Intentionally hardcoded. Do not derive from other constants (e.g. VERSION) or vice versa.
-  public static final int VERSION_INT = 1_000_000_3_00;
+  public static final int VERSION_INT = 1_000_001_3_00;
 
   /** Whether the library was compiled with {@link Assertions} checks enabled. */
   public static final boolean ASSERTIONS_ENABLED = true;

libraries/common/src/main/java/androidx/media3/common/PlaybackException.java

@@ -152,8 +152,9 @@ public class PlaybackException extends Exception implements Bundleable {
    * Caused by the player trying to access cleartext HTTP traffic (meaning http:// rather than
    * https://) when the app's Network Security Configuration does not permit it.
    *
-   * <p>See <a href="https://exoplayer.dev/issues/cleartext-not-permitted">this corresponding
+   * <p>See <a
-   * troubleshooting topic</a>.
+   * href="https://developer.android.com/guide/topics/media/issues/cleartext-not-permitted">this
+   * corresponding troubleshooting topic</a>.
    */
   public static final int ERROR_CODE_IO_CLEARTEXT_NOT_PERMITTED = 2007;
   /** Caused by reading data out of the data bound. */

libraries/common/src/main/java/androidx/media3/common/SimpleBasePlayer.java

@@ -3355,7 +3355,8 @@ public abstract class SimpleBasePlayer extends BasePlayer {
               "Player is accessed on the wrong thread.\n"
                   + "Current thread: '%s'\n"
                   + "Expected thread: '%s'\n"
-                  + "See https://exoplayer.dev/issues/player-accessed-on-wrong-thread",
+                  + "See https://developer.android.com/guide/topics/media/issues/"
+                  + "player-accessed-on-wrong-thread",
               Thread.currentThread().getName(), applicationLooper.getThread().getName());
       throw new IllegalStateException(message);
     }

libraries/common/src/main/java/androidx/media3/common/Timeline.java

@@ -61,8 +61,9 @@ import java.util.List;
  *
  * <h2 id="single-file">Single media file or on-demand stream</h2>
  *
- * <p style="align:center"><img src="doc-files/timeline-single-file.svg" alt="Example timeline for a
+ * <p style="align:center"><img
- * single file">
+ * src="https://exoplayer.dev/doc/reference/com/google/android/exoplayer2/doc-files/timeline-single-file.svg"
+ * alt="Example timeline for a single file">
  *
  * <p>A timeline for a single media file or on-demand stream consists of a single period and window.
  * The window spans the whole period, indicating that all parts of the media are available for
@@ -71,8 +72,9 @@ import java.util.List;
  *
  * <h2>Playlist of media files or on-demand streams</h2>
  *
- * <p style="align:center"><img src="doc-files/timeline-playlist.svg" alt="Example timeline for a
+ * <p style="align:center"><img
- * playlist of files">
+ * src="https://exoplayer.dev/doc/reference/com/google/android/exoplayer2/doc-files/timeline-playlist.svg"
+ * alt="Example timeline for a playlist of files">
  *
  * <p>A timeline for a playlist of media files or on-demand streams consists of multiple periods,
  * each with its own window. Each window spans the whole of the corresponding period, and typically
@@ -82,8 +84,9 @@ import java.util.List;
  *
  * <h2 id="live-limited">Live stream with limited availability</h2>
  *
- * <p style="align:center"><img src="doc-files/timeline-live-limited.svg" alt="Example timeline for
+ * <p style="align:center"><img
- * a live stream with limited availability">
+ * src="https://exoplayer.dev/doc/reference/com/google/android/exoplayer2/doc-files/timeline-live-limited.svg"
+ * alt="Example timeline for a live stream with limited availability">
  *
  * <p>A timeline for a live stream consists of a period whose duration is unknown, since it's
  * continually extending as more content is broadcast. If content only remains available for a
@@ -95,8 +98,9 @@ import java.util.List;
  *
  * <h2>Live stream with indefinite availability</h2>
  *
- * <p style="align:center"><img src="doc-files/timeline-live-indefinite.svg" alt="Example timeline
+ * <p style="align:center"><img
- * for a live stream with indefinite availability">
+ * src="https://exoplayer.dev/doc/reference/com/google/android/exoplayer2/doc-files/timeline-live-indefinite.svg"
+ * alt="Example timeline for a live stream with indefinite availability">
  *
  * <p>A timeline for a live stream with indefinite availability is similar to the <a
  * href="#live-limited">Live stream with limited availability</a> case, except that the window
@@ -105,8 +109,9 @@ import java.util.List;
  *
  * <h2 id="live-multi-period">Live stream with multiple periods</h2>
  *
- * <p style="align:center"><img src="doc-files/timeline-live-multi-period.svg" alt="Example timeline
+ * <p style="align:center"><img
- * for a live stream with multiple periods">
+ * src="https://exoplayer.dev/doc/reference/com/google/android/exoplayer2/doc-files/timeline-live-multi-period.svg"
+ * alt="Example timeline for a live stream with multiple periods">
  *
  * <p>This case arises when a live stream is explicitly divided into separate periods, for example
  * at content boundaries. This case is similar to the <a href="#live-limited">Live stream with
@@ -115,8 +120,9 @@ import java.util.List;
  *
  * <h2>On-demand stream followed by live stream</h2>
  *
- * <p style="align:center"><img src="doc-files/timeline-advanced.svg" alt="Example timeline for an
+ * <p style="align:center"><img
- * on-demand stream followed by a live stream">
+ * src="https://exoplayer.dev/doc/reference/com/google/android/exoplayer2/doc-files/timeline-advanced.svg"
+ * alt="Example timeline for an on-demand stream followed by a live stream">
  *
  * <p>This case is the concatenation of the <a href="#single-file">Single media file or on-demand
  * stream</a> and <a href="#multi-period">Live stream with multiple periods</a> cases. When playback
@@ -125,12 +131,15 @@ import java.util.List;
  *
  * <h2 id="single-file-midrolls">On-demand stream with mid-roll ads</h2>
  *
- * <p style="align:center"><img src="doc-files/timeline-single-file-midrolls.svg" alt="Example
+ * <p style="align:center"><img
- * timeline for an on-demand stream with mid-roll ad groups">
+ * src="https://exoplayer.dev/doc/reference/com/google/android/exoplayer2/doc-files/timeline-single-file-midrolls.svg"
+ * alt="Example timeline for an on-demand stream with mid-roll ad groups">
  *
  * <p>This case includes mid-roll ad groups, which are defined as part of the timeline's single
  * period. The period can be queried for information about the ad groups and the ads they contain.
  */
+// TODO(b/276289331): Revert to media3-hosted SVG links above once they're available on
+// developer.android.com.
 public abstract class Timeline implements Bundleable {
 
   /**

libraries/common/src/main/java/androidx/media3/common/Tracks.java

@@ -191,6 +191,18 @@ public final class Tracks implements Bundleable {
       return mediaTrackGroup.type;
     }
 
+    /**
+     * Copies the {@code Group} with a new {@link TrackGroup#id}.
+     *
+     * @param groupId The new {@link TrackGroup#id}
+     * @return The copied {@code Group}.
+     */
+    @UnstableApi
+    public Group copyWithId(String groupId) {
+      return new Group(
+          mediaTrackGroup.copyWithId(groupId), adaptiveSupported, trackSupport, trackSelected);
+    }
+
     @Override
     public boolean equals(@Nullable Object other) {
       if (this == other) {

libraries/common/src/main/java/androidx/media3/common/util/GlUtil.java

@@ -142,7 +142,7 @@ public final class GlUtil {
   }
 
   /**
-   * Returns whether creating a GL context with {@value #EXTENSION_PROTECTED_CONTENT} is possible.
+   * Returns whether creating a GL context with {@link #EXTENSION_PROTECTED_CONTENT} is possible.
    *
    * <p>If {@code true}, the device supports a protected output path for DRM content when using GL.
    */
@@ -171,7 +171,7 @@ public final class GlUtil {
   }
 
   /**
-   * Returns whether the {@value #EXTENSION_SURFACELESS_CONTEXT} extension is supported.
+   * Returns whether the {@link #EXTENSION_SURFACELESS_CONTEXT} extension is supported.
    *
    * <p>This extension allows passing {@link EGL14#EGL_NO_SURFACE} for both the write and read
    * surfaces in a call to {@link EGL14#eglMakeCurrent(EGLDisplay, EGLSurface, EGLSurface,
@@ -187,7 +187,7 @@ public final class GlUtil {
   }
 
   /**
-   * Returns whether the {@value #EXTENSION_YUV_TARGET} extension is supported.
+   * Returns whether the {@link #EXTENSION_YUV_TARGET} extension is supported.
    *
    * <p>This extension allows sampling raw YUV values from an external texture, which is required
    * for HDR.

libraries/datasource/src/main/java/androidx/media3/datasource/HttpDataSource.java

@@ -375,8 +375,8 @@ public interface HttpDataSource extends DataSource {
   /**
    * Thrown when cleartext HTTP traffic is not permitted. For more information including how to
    * enable cleartext traffic, see the <a
-   * href="https://exoplayer.dev/issues/cleartext-not-permitted">corresponding troubleshooting
+   * href="https://developer.android.com/guide/topics/media/issues/cleartext-not-permitted">corresponding
-   * topic</a>.
+   * troubleshooting topic</a>.
    */
   final class CleartextNotPermittedException extends HttpDataSourceException {
 
@@ -384,7 +384,7 @@ public interface HttpDataSource extends DataSource {
     public CleartextNotPermittedException(IOException cause, DataSpec dataSpec) {
       super(
           "Cleartext HTTP traffic not permitted. See"
-              + " https://exoplayer.dev/issues/cleartext-not-permitted",
+              + " https://developer.android.com/guide/topics/media/issues/cleartext-not-permitted",
           cause,
           dataSpec,
           PlaybackException.ERROR_CODE_IO_CLEARTEXT_NOT_PERMITTED,

libraries/decoder_av1/README.md

@@ -128,6 +128,4 @@ GL rendering mode has better performance, so should be preferred
 
 *   [Troubleshooting using decoding extensions][]
 
-<!-- TODO(b/276289331): Add Javadoc link when it's published on developer.android.com -->
-
 [Troubleshooting using decoding extensions]: https://developer.android.com/guide/topics/media/exoplayer/troubleshooting#how-can-i-get-a-decoding-library-to-load-and-be-used-for-playbacks

libraries/decoder_ffmpeg/README.md

@@ -115,12 +115,10 @@ then implement your own logic to use the renderer for a given track.
 [top level README]: ../../README.md
 [Android NDK]: https://developer.android.com/tools/sdk/ndk/index.html
 [ExoPlayer issue 2781]: https://github.com/google/ExoPlayer/issues/2781
-[Supported formats]: https://exoplayer.dev/supported-formats.html#ffmpeg-extension
+[Supported formats]: https://developer.android.com/guide/topics/media/exoplayer/supported-formats#ffmpeg-library
 
 ## Links
 
 *   [Troubleshooting using decoding extensions][]
 
-<!-- TODO(b/276289331): Add Javadoc link when it's published on developer.android.com -->
-
 [Troubleshooting using decoding extensions]: https://developer.android.com/guide/topics/media/exoplayer/troubleshooting#how-can-i-get-a-decoding-library-to-load-and-be-used-for-playback

libraries/decoder_flac/README.md

@@ -100,6 +100,4 @@ player, then implement your own logic to use the renderer for a given track.
 
 *   [Troubleshooting using decoding extensions][]
 
-<!-- TODO(b/276289331): Add Javadoc link when it's published on developer.android.com -->
-
 [Troubleshooting using decoding extensions]: https://developer.android.com/guide/topics/media/exoplayer/troubleshooting#how-can-i-get-a-decoding-library-to-load-and-be-used-for-playback

libraries/decoder_opus/README.md

@@ -104,6 +104,4 @@ player, then implement your own logic to use the renderer for a given track.
 
 *   [Troubleshooting using decoding extensions][]
 
-<!-- TODO(b/276289331): Add Javadoc link when it's published on developer.android.com -->
-
 [Troubleshooting using decoding extensions]: https://developer.android.com/guide/topics/media/exoplayer/troubleshooting#how-can-i-get-a-decoding-library-to-load-and-be-used-for-playback

libraries/decoder_vp9/README.md

@@ -141,6 +141,4 @@ GL rendering mode has better performance, so should be preferred.
 
 *   [Troubleshooting using decoding extensions][]
 
-<!-- TODO(b/276289331): Add Javadoc link when it's published on developer.android.com -->
-
 [Troubleshooting using decoding extensions]: https://developer.android.com/guide/topics/media/exoplayer/troubleshooting#how-can-i-get-a-decoding-library-to-load-and-be-used-for-playback

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/ExoPlayer.java

@@ -128,8 +128,9 @@ import java.util.List;
  *
  * <p>The figure below shows ExoPlayer's threading model.
  *
- * <p style="align:center"><img src="doc-files/exoplayer-threading-model.svg" alt="ExoPlayer's
+ * <p style="align:center"><img
- * threading model">
+ * src="https://exoplayer.dev/doc/reference/com/google/android/exoplayer2/doc-files/exoplayer-threading-model.svg"
+ * alt="ExoPlayer's threading model">
  *
  * <ul>
  *   <li>ExoPlayer instances must be accessed from a single application thread unless indicated
@@ -158,6 +159,8 @@ import java.util.List;
  *       may use background threads to load data. These are implementation specific.
  * </ul>
  */
+// TODO(b/276289331): Revert to media3-hosted SVG links above once they're available on
+// developer.android.com.
 public interface ExoPlayer extends Player {
 
   /**

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/ExoPlayerImpl.java

@@ -2673,7 +2673,8 @@ import java.util.concurrent.TimeoutException;
               "Player is accessed on the wrong thread.\n"
                   + "Current thread: '%s'\n"
                   + "Expected thread: '%s'\n"
-                  + "See https://exoplayer.dev/issues/player-accessed-on-wrong-thread",
+                  + "See https://developer.android.com/guide/topics/media/issues/"
+                  + "player-accessed-on-wrong-thread",
               Thread.currentThread().getName(), getApplicationLooper().getThread().getName());
       if (throwsWhenUsingWrongThread) {
         throw new IllegalStateException(message);

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/ExoPlayerImplInternal.java

@@ -1239,7 +1239,8 @@ import java.util.concurrent.atomic.AtomicBoolean;
             /* newPeriodId= */ periodId,
             /* oldTimeline= */ playbackInfo.timeline,
             /* oldPeriodId= */ playbackInfo.periodId,
-            /* positionForTargetOffsetOverrideUs= */ requestedContentPositionUs);
+            /* positionForTargetOffsetOverrideUs= */ requestedContentPositionUs,
+            /* forceSetTargetOffsetOverride= */ true);
       }
     } finally {
       playbackInfo =
@@ -1882,7 +1883,8 @@ import java.util.concurrent.atomic.AtomicBoolean;
           /* oldPeriodId= */ playbackInfo.periodId,
           /* positionForTargetOffsetOverrideUs */ positionUpdate.setTargetLiveOffset
               ? newPositionUs
-              : C.TIME_UNSET);
+              : C.TIME_UNSET,
+          /* forceSetTargetOffsetOverride= */ false);
       if (periodPositionChanged
           || newRequestedContentPositionUs != playbackInfo.requestedContentPositionUs) {
         Object oldPeriodUid = playbackInfo.periodId.periodUid;
@@ -1920,7 +1922,8 @@ import java.util.concurrent.atomic.AtomicBoolean;
       MediaPeriodId newPeriodId,
       Timeline oldTimeline,
       MediaPeriodId oldPeriodId,
-      long positionForTargetOffsetOverrideUs)
+      long positionForTargetOffsetOverrideUs,
+      boolean forceSetTargetOffsetOverride)
       throws ExoPlaybackException {
     if (!shouldUseLivePlaybackSpeedControl(newTimeline, newPeriodId)) {
       // Live playback speed control is unused for the current period, reset speed to user-defined
@@ -1950,8 +1953,9 @@ import java.util.concurrent.atomic.AtomicBoolean;
         int oldWindowIndex = oldTimeline.getPeriodByUid(oldPeriodId.periodUid, period).windowIndex;
         oldWindowUid = oldTimeline.getWindow(oldWindowIndex, window).uid;
       }
-      if (!Util.areEqual(oldWindowUid, windowUid)) {
+      if (!Util.areEqual(oldWindowUid, windowUid) || forceSetTargetOffsetOverride) {
-        // Reset overridden target live offset to media values if window changes.
+        // Reset overridden target live offset to media values if window changes or if seekTo
+        // default live position.
         livePlaybackSpeedControl.setTargetLiveOffsetOverrideUs(C.TIME_UNSET);
       }
     }
@@ -2074,7 +2078,8 @@ import java.util.concurrent.atomic.AtomicBoolean;
         /* newPeriodId= */ readingPeriodHolder.info.id,
         /* oldTimeline= */ playbackInfo.timeline,
         /* oldPeriodId= */ oldReadingPeriodHolder.info.id,
-        /* positionForTargetOffsetOverrideUs= */ C.TIME_UNSET);
+        /* positionForTargetOffsetOverrideUs= */ C.TIME_UNSET,
+        /* forceSetTargetOffsetOverride= */ false);
 
     if (readingPeriodHolder.prepared
         && readingPeriodHolder.mediaPeriod.readDiscontinuity() != C.TIME_UNSET) {

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/Renderer.java

@@ -47,9 +47,12 @@ import java.lang.annotation.Target;
  * valid state transitions are shown below, annotated with the methods that are called during each
  * transition.
  *
- * <p style="align:center"><img src="doc-files/renderer-states.svg" alt="Renderer state
+ * <p style="align:center"><img
- * transitions">
+ * src="https://exoplayer.dev/doc/reference/com/google/android/exoplayer2/doc-files/renderer-states.svg"
+ * alt="Renderer state transitions">
  */
+// TODO(b/276289331): Revert to media3-hosted SVG links above once they're available on
+// developer.android.com.
 @UnstableApi
 public interface Renderer extends PlayerMessage.Target {
 

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/audio/AudioSink.java

@@ -189,6 +189,8 @@ public interface AudioSink {
               + audioTrackState
               + " "
               + ("Config(" + sampleRate + ", " + channelConfig + ", " + bufferSize + ")")
+              + " "
+              + format
               + (isRecoverable ? " (recoverable)" : ""),
           audioTrackException);
       this.audioTrackState = audioTrackState;

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/audio/DefaultAudioTrackBufferSizeProvider.java

@@ -80,7 +80,7 @@ public class DefaultAudioTrackBufferSizeProvider
 
     /**
      * Sets the minimum length for PCM {@link AudioTrack} buffers, in microseconds. Default is
-     * {@value #MIN_PCM_BUFFER_DURATION_US}.
+     * {@link #MIN_PCM_BUFFER_DURATION_US}.
      */
     @CanIgnoreReturnValue
     public Builder setMinPcmBufferDurationUs(int minPcmBufferDurationUs) {
@@ -90,7 +90,7 @@ public class DefaultAudioTrackBufferSizeProvider
 
     /**
      * Sets the maximum length for PCM {@link AudioTrack} buffers, in microseconds. Default is
-     * {@value #MAX_PCM_BUFFER_DURATION_US}.
+     * {@link #MAX_PCM_BUFFER_DURATION_US}.
      */
     @CanIgnoreReturnValue
     public Builder setMaxPcmBufferDurationUs(int maxPcmBufferDurationUs) {
@@ -100,7 +100,7 @@ public class DefaultAudioTrackBufferSizeProvider
 
     /**
      * Sets the multiplication factor to apply to the minimum buffer size requested. Default is
-     * {@value #PCM_BUFFER_MULTIPLICATION_FACTOR}.
+     * {@link #PCM_BUFFER_MULTIPLICATION_FACTOR}.
      */
     @CanIgnoreReturnValue
     public Builder setPcmBufferMultiplicationFactor(int pcmBufferMultiplicationFactor) {
@@ -110,7 +110,7 @@ public class DefaultAudioTrackBufferSizeProvider
 
     /**
      * Sets the length for passthrough {@link AudioTrack} buffers, in microseconds. Default is
-     * {@value #PASSTHROUGH_BUFFER_DURATION_US}.
+     * {@link #PASSTHROUGH_BUFFER_DURATION_US}.
      */
     @CanIgnoreReturnValue
     public Builder setPassthroughBufferDurationUs(int passthroughBufferDurationUs) {
@@ -119,7 +119,7 @@ public class DefaultAudioTrackBufferSizeProvider
     }
 
     /**
-     * The length for offload {@link AudioTrack} buffers, in microseconds. Default is {@value
+     * The length for offload {@link AudioTrack} buffers, in microseconds. Default is {@link
      * #OFFLOAD_BUFFER_DURATION_US}.
      */
     @CanIgnoreReturnValue
@@ -130,7 +130,7 @@ public class DefaultAudioTrackBufferSizeProvider
 
     /**
      * Sets the multiplication factor to apply to the passthrough buffer for AC3 to avoid underruns
-     * on some devices (e.g., Broadcom 7271). Default is {@value #AC3_BUFFER_MULTIPLICATION_FACTOR}.
+     * on some devices (e.g., Broadcom 7271). Default is {@link #AC3_BUFFER_MULTIPLICATION_FACTOR}.
      */
     @CanIgnoreReturnValue
     public Builder setAc3BufferMultiplicationFactor(int ac3BufferMultiplicationFactor) {

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/audio/MediaCodecAudioRenderer.java

@@ -105,6 +105,7 @@ public class MediaCodecAudioRenderer extends MediaCodecRenderer implements Media
 
   private int codecMaxInputSize;
   private boolean codecNeedsDiscardChannelsWorkaround;
+  @Nullable private Format inputFormat;
   /** Codec used for DRM decryption only in passthrough and offload. */
   @Nullable private Format decryptOnlyCodecFormat;
 
@@ -500,8 +501,9 @@ public class MediaCodecAudioRenderer extends MediaCodecRenderer implements Media
   @Nullable
   protected DecoderReuseEvaluation onInputFormatChanged(FormatHolder formatHolder)
       throws ExoPlaybackException {
+    inputFormat = checkNotNull(formatHolder.format);
     @Nullable DecoderReuseEvaluation evaluation = super.onInputFormatChanged(formatHolder);
-    eventDispatcher.inputFormatChanged(formatHolder.format, evaluation);
+    eventDispatcher.inputFormatChanged(inputFormat, evaluation);
     return evaluation;
   }
 
@@ -604,6 +606,7 @@ public class MediaCodecAudioRenderer extends MediaCodecRenderer implements Media
   @Override
   protected void onDisabled() {
     audioSinkNeedsReset = true;
+    inputFormat = null;
     try {
       audioSink.flush();
     } finally {
@@ -711,7 +714,7 @@ public class MediaCodecAudioRenderer extends MediaCodecRenderer implements Media
       fullyConsumed = audioSink.handleBuffer(buffer, bufferPresentationTimeUs, sampleCount);
     } catch (InitializationException e) {
       throw createRendererException(
-          e, e.format, e.isRecoverable, PlaybackException.ERROR_CODE_AUDIO_TRACK_INIT_FAILED);
+          e, inputFormat, e.isRecoverable, PlaybackException.ERROR_CODE_AUDIO_TRACK_INIT_FAILED);
     } catch (WriteException e) {
       throw createRendererException(
           e, format, e.isRecoverable, PlaybackException.ERROR_CODE_AUDIO_TRACK_WRITE_FAILED);

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/drm/DefaultDrmSession.java

@@ -136,9 +136,10 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
   private final LoadErrorHandlingPolicy loadErrorHandlingPolicy;
   private final PlayerId playerId;
 
-  /* package */ final MediaDrmCallback callback;
+  private final MediaDrmCallback callback;
-  /* package */ final UUID uuid;
+  private final UUID uuid;
-  /* package */ final ResponseHandler responseHandler;
+  private final Looper playbackLooper;
+  private final ResponseHandler responseHandler;
 
   private @DrmSession.State int state;
   private int referenceCount;
@@ -209,10 +210,12 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
     this.loadErrorHandlingPolicy = loadErrorHandlingPolicy;
     this.playerId = playerId;
     state = STATE_OPENING;
+    this.playbackLooper = playbackLooper;
     responseHandler = new ResponseHandler(playbackLooper);
   }
 
   public boolean hasSessionId(byte[] sessionId) {
+    verifyPlaybackThread();
     return Arrays.equals(this.sessionId, sessionId);
   }
 
@@ -255,50 +258,59 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
 
   @Override
   public final @DrmSession.State int getState() {
+    verifyPlaybackThread();
     return state;
   }
 
   @Override
   public boolean playClearSamplesWithoutKeys() {
+    verifyPlaybackThread();
     return playClearSamplesWithoutKeys;
   }
 
   @Override
   @Nullable
   public final DrmSessionException getError() {
+    verifyPlaybackThread();
     return state == STATE_ERROR ? lastException : null;
   }
 
   @Override
   public final UUID getSchemeUuid() {
+    verifyPlaybackThread();
     return uuid;
   }
 
   @Override
   @Nullable
   public final CryptoConfig getCryptoConfig() {
+    verifyPlaybackThread();
     return cryptoConfig;
   }
 
   @Override
   @Nullable
   public Map<String, String> queryKeyStatus() {
+    verifyPlaybackThread();
     return sessionId == null ? null : mediaDrm.queryKeyStatus(sessionId);
   }
 
   @Override
   @Nullable
   public byte[] getOfflineLicenseKeySetId() {
+    verifyPlaybackThread();
     return offlineLicenseKeySetId;
   }
 
   @Override
   public boolean requiresSecureDecoder(String mimeType) {
+    verifyPlaybackThread();
     return mediaDrm.requiresSecureDecoder(checkStateNotNull(sessionId), mimeType);
   }
 
   @Override
   public void acquire(@Nullable DrmSessionEventListener.EventDispatcher eventDispatcher) {
+    verifyPlaybackThread();
     if (referenceCount < 0) {
       Log.e(TAG, "Session reference count less than zero: " + referenceCount);
       referenceCount = 0;
@@ -326,6 +338,7 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
 
   @Override
   public void release(@Nullable DrmSessionEventListener.EventDispatcher eventDispatcher) {
+    verifyPlaybackThread();
     if (referenceCount <= 0) {
       Log.e(TAG, "release() called on a session that's already fully released.");
       return;
@@ -561,6 +574,18 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
     }
   }
 
+  private void verifyPlaybackThread() {
+    if (Thread.currentThread() != playbackLooper.getThread()) {
+      Log.w(
+          TAG,
+          "DefaultDrmSession accessed on the wrong thread.\nCurrent thread: "
+              + Thread.currentThread().getName()
+              + "\nExpected thread: "
+              + playbackLooper.getThread().getName(),
+          new IllegalStateException());
+    }
+  }
+
   // Internal classes.
 
   @SuppressLint("HandlerLeak")

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/drm/DefaultDrmSessionManager.java

@@ -471,6 +471,7 @@ public class DefaultDrmSessionManager implements DrmSessionManager {
 
   @Override
   public final void prepare() {
+    verifyPlaybackThread(/* allowBeforeSetPlayer= */ true);
     if (prepareCallsCount++ != 0) {
       return;
     }
@@ -487,6 +488,7 @@ public class DefaultDrmSessionManager implements DrmSessionManager {
 
   @Override
   public final void release() {
+    verifyPlaybackThread(/* allowBeforeSetPlayer= */ true);
     if (--prepareCallsCount != 0) {
       return;
     }
@@ -513,6 +515,7 @@ public class DefaultDrmSessionManager implements DrmSessionManager {
   @Override
   public DrmSessionReference preacquireSession(
       @Nullable DrmSessionEventListener.EventDispatcher eventDispatcher, Format format) {
+    // Don't verify the playback thread, preacquireSession can be called from any thread.
     checkState(prepareCallsCount > 0);
     checkStateNotNull(playbackLooper);
     PreacquiredSessionReference preacquiredSessionReference =
@@ -525,6 +528,7 @@ public class DefaultDrmSessionManager implements DrmSessionManager {
   @Nullable
   public DrmSession acquireSession(
       @Nullable DrmSessionEventListener.EventDispatcher eventDispatcher, Format format) {
+    verifyPlaybackThread(/* allowBeforeSetPlayer= */ false);
     checkState(prepareCallsCount > 0);
     checkStateNotNull(playbackLooper);
     return acquireSession(
@@ -599,6 +603,7 @@ public class DefaultDrmSessionManager implements DrmSessionManager {
 
   @Override
   public @C.CryptoType int getCryptoType(Format format) {
+    verifyPlaybackThread(/* allowBeforeSetPlayer= */ false);
     @C.CryptoType int cryptoType = checkNotNull(exoMediaDrm).getCryptoType();
     if (format.drmInitData == null) {
       int trackType = MimeTypes.getTrackType(format.sampleMimeType);
@@ -817,6 +822,23 @@ public class DefaultDrmSessionManager implements DrmSessionManager {
     }
   }
 
+  private void verifyPlaybackThread(boolean allowBeforeSetPlayer) {
+    if (allowBeforeSetPlayer && playbackLooper == null) {
+      Log.w(
+          TAG,
+          "DefaultDrmSessionManager accessed before setPlayer(), possibly on the wrong thread.",
+          new IllegalStateException());
+    } else if (Thread.currentThread() != checkNotNull(playbackLooper).getThread()) {
+      Log.w(
+          TAG,
+          "DefaultDrmSessionManager accessed on the wrong thread.\nCurrent thread: "
+              + Thread.currentThread().getName()
+              + "\nExpected thread: "
+              + playbackLooper.getThread().getName(),
+          new IllegalStateException());
+    }
+  }
+
   /**
    * Extracts {@link SchemeData} instances suitable for the given DRM scheme {@link UUID}.
    *

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/drm/OfflineLicenseHelper.java

@@ -19,6 +19,7 @@ import android.media.MediaDrm;
 import android.os.ConditionVariable;
 import android.os.Handler;
 import android.os.HandlerThread;
+import android.os.Looper;
 import android.util.Pair;
 import androidx.annotation.Nullable;
 import androidx.annotation.RequiresApi;
@@ -31,8 +32,11 @@ import androidx.media3.exoplayer.analytics.PlayerId;
 import androidx.media3.exoplayer.drm.DefaultDrmSessionManager.Mode;
 import androidx.media3.exoplayer.drm.DrmSession.DrmSessionException;
 import androidx.media3.exoplayer.source.MediaSource.MediaPeriodId;
+import com.google.common.util.concurrent.SettableFuture;
 import java.util.Map;
 import java.util.UUID;
+import java.util.concurrent.ExecutionException;
+import org.checkerframework.checker.nullness.compatqual.NullableType;
 
 /** Helper class to download, renew and release offline licenses. */
 @RequiresApi(18)
@@ -42,9 +46,10 @@ public final class OfflineLicenseHelper {
   private static final Format FORMAT_WITH_EMPTY_DRM_INIT_DATA =
       new Format.Builder().setDrmInitData(new DrmInitData()).build();
 
-  private final ConditionVariable conditionVariable;
+  private final ConditionVariable drmListenerConditionVariable;
   private final DefaultDrmSessionManager drmSessionManager;
   private final HandlerThread handlerThread;
+  private final Handler handler;
   private final DrmSessionEventListener.EventDispatcher eventDispatcher;
 
   /**
@@ -156,28 +161,29 @@ public final class OfflineLicenseHelper {
     this.eventDispatcher = eventDispatcher;
     handlerThread = new HandlerThread("ExoPlayer:OfflineLicenseHelper");
     handlerThread.start();
-    conditionVariable = new ConditionVariable();
+    handler = new Handler(handlerThread.getLooper());
+    drmListenerConditionVariable = new ConditionVariable();
     DrmSessionEventListener eventListener =
         new DrmSessionEventListener() {
           @Override
           public void onDrmKeysLoaded(int windowIndex, @Nullable MediaPeriodId mediaPeriodId) {
-            conditionVariable.open();
+            drmListenerConditionVariable.open();
           }
 
           @Override
           public void onDrmSessionManagerError(
               int windowIndex, @Nullable MediaPeriodId mediaPeriodId, Exception e) {
-            conditionVariable.open();
+            drmListenerConditionVariable.open();
           }
 
           @Override
           public void onDrmKeysRestored(int windowIndex, @Nullable MediaPeriodId mediaPeriodId) {
-            conditionVariable.open();
+            drmListenerConditionVariable.open();
           }
 
           @Override
           public void onDrmKeysRemoved(int windowIndex, @Nullable MediaPeriodId mediaPeriodId) {
-            conditionVariable.open();
+            drmListenerConditionVariable.open();
           }
         };
     eventDispatcher.addEventListener(new Handler(handlerThread.getLooper()), eventListener);
@@ -193,7 +199,8 @@ public final class OfflineLicenseHelper {
    */
   public synchronized byte[] downloadLicense(Format format) throws DrmSessionException {
     Assertions.checkArgument(format.drmInitData != null);
-    return blockingKeyRequest(DefaultDrmSessionManager.MODE_DOWNLOAD, null, format);
+    return acquireSessionAndGetOfflineLicenseKeySetIdOnHandlerThread(
+        DefaultDrmSessionManager.MODE_DOWNLOAD, /* offlineLicenseKeySetId= */ null, format);
   }
 
   /**
@@ -206,7 +213,7 @@ public final class OfflineLicenseHelper {
   public synchronized byte[] renewLicense(byte[] offlineLicenseKeySetId)
       throws DrmSessionException {
     Assertions.checkNotNull(offlineLicenseKeySetId);
-    return blockingKeyRequest(
+    return acquireSessionAndGetOfflineLicenseKeySetIdOnHandlerThread(
         DefaultDrmSessionManager.MODE_DOWNLOAD,
         offlineLicenseKeySetId,
         FORMAT_WITH_EMPTY_DRM_INIT_DATA);
@@ -221,7 +228,7 @@ public final class OfflineLicenseHelper {
   public synchronized void releaseLicense(byte[] offlineLicenseKeySetId)
       throws DrmSessionException {
     Assertions.checkNotNull(offlineLicenseKeySetId);
-    blockingKeyRequest(
+    acquireSessionAndGetOfflineLicenseKeySetIdOnHandlerThread(
         DefaultDrmSessionManager.MODE_RELEASE,
         offlineLicenseKeySetId,
         FORMAT_WITH_EMPTY_DRM_INIT_DATA);
@@ -237,25 +244,39 @@ public final class OfflineLicenseHelper {
   public synchronized Pair<Long, Long> getLicenseDurationRemainingSec(byte[] offlineLicenseKeySetId)
       throws DrmSessionException {
     Assertions.checkNotNull(offlineLicenseKeySetId);
-    drmSessionManager.setPlayer(handlerThread.getLooper(), PlayerId.UNSET);
+    DrmSession drmSession;
-    drmSessionManager.prepare();
+    try {
-    DrmSession drmSession =
+      drmSession =
-        openBlockingKeyRequest(
+          acquireFirstSessionOnHandlerThread(
               DefaultDrmSessionManager.MODE_QUERY,
               offlineLicenseKeySetId,
               FORMAT_WITH_EMPTY_DRM_INIT_DATA);
-    DrmSessionException error = drmSession.getError();
+    } catch (DrmSessionException e) {
-    Pair<Long, Long> licenseDurationRemainingSec =
+      if (e.getCause() instanceof KeysExpiredException) {
-        WidevineUtil.getLicenseDurationRemainingSec(drmSession);
-    drmSession.release(eventDispatcher);
-    drmSessionManager.release();
-    if (error != null) {
-      if (error.getCause() instanceof KeysExpiredException) {
         return Pair.create(0L, 0L);
       }
-      throw error;
+      throw e;
+    }
+
+    SettableFuture<Pair<Long, Long>> licenseDurationRemainingSec = SettableFuture.create();
+    handler.post(
+        () -> {
+          try {
+            licenseDurationRemainingSec.set(
+                Assertions.checkNotNull(WidevineUtil.getLicenseDurationRemainingSec(drmSession)));
+          } catch (Throwable e) {
+            licenseDurationRemainingSec.setException(e);
+          } finally {
+            drmSession.release(eventDispatcher);
+          }
+        });
+    try {
+      return licenseDurationRemainingSec.get();
+    } catch (ExecutionException | InterruptedException e) {
+      throw new IllegalStateException(e);
+    } finally {
+      releaseManagerOnHandlerThread();
     }
-    return Assertions.checkNotNull(licenseDurationRemainingSec);
   }
 
   /** Releases the helper. Should be called when the helper is no longer required. */
@@ -263,30 +284,146 @@ public final class OfflineLicenseHelper {
     handlerThread.quit();
   }
 
-  private byte[] blockingKeyRequest(
+  /**
+   * Returns the result of {@link DrmSession#getOfflineLicenseKeySetId()}, or throws {@link
+   * NullPointerException} if it's null.
+   *
+   * <p>This method takes care of acquiring and releasing the {@link DrmSessionManager} and {@link
+   * DrmSession} instances needed.
+   */
+  private byte[] acquireSessionAndGetOfflineLicenseKeySetIdOnHandlerThread(
       @Mode int licenseMode, @Nullable byte[] offlineLicenseKeySetId, Format format)
       throws DrmSessionException {
-    drmSessionManager.setPlayer(handlerThread.getLooper(), PlayerId.UNSET);
+    DrmSession drmSession =
-    drmSessionManager.prepare();
+        acquireFirstSessionOnHandlerThread(licenseMode, offlineLicenseKeySetId, format);
-    DrmSession drmSession = openBlockingKeyRequest(licenseMode, offlineLicenseKeySetId, format);
+
-    DrmSessionException error = drmSession.getError();
+    SettableFuture<byte @NullableType []> keySetId = SettableFuture.create();
-    byte[] keySetId = drmSession.getOfflineLicenseKeySetId();
+    handler.post(
+        () -> {
+          try {
+            keySetId.set(drmSession.getOfflineLicenseKeySetId());
+          } catch (Throwable e) {
+            keySetId.setException(e);
+          } finally {
             drmSession.release(eventDispatcher);
-    drmSessionManager.release();
-    if (error != null) {
-      throw error;
           }
-    return Assertions.checkNotNull(keySetId);
+        });
+
+    try {
+      return Assertions.checkNotNull(keySetId.get());
+    } catch (ExecutionException | InterruptedException e) {
+      throw new IllegalStateException(e);
+    } finally {
+      releaseManagerOnHandlerThread();
+    }
   }
 
-  private DrmSession openBlockingKeyRequest(
+  /**
-      @Mode int licenseMode, @Nullable byte[] offlineLicenseKeySetId, Format format) {
+   * Calls {@link DrmSessionManager#acquireSession(DrmSessionEventListener.EventDispatcher, Format)}
+   * on {@link #handlerThread} and blocks until a callback is received via {@link
+   * DrmSessionEventListener}.
+   *
+   * <p>If key loading failed and {@link DrmSession#getState()} returns {@link
+   * DrmSession#STATE_ERROR} then this method releases the session and throws {@link
+   * DrmSession#getError()}.
+   *
+   * <p>Callers are responsible for the following:
+   *
+   * <ul>
+   *   <li>Ensuring the {@link
+   *       DrmSessionManager#acquireSession(DrmSessionEventListener.EventDispatcher, Format)} call
+   *       will trigger a callback to {@link DrmSessionEventListener} (e.g. it will load new keys).
+   *       If not, this method will block forever.
+   *   <li>Releasing the returned {@link DrmSession} instance (on {@link #handlerThread}).
+   *   <li>Releasing {@link #drmSessionManager} if a {@link DrmSession} instance is returned (the
+   *       manager will be released before an exception is thrown).
+   * </ul>
+   */
+  private DrmSession acquireFirstSessionOnHandlerThread(
+      @Mode int licenseMode, @Nullable byte[] offlineLicenseKeySetId, Format format)
+      throws DrmSessionException {
     Assertions.checkNotNull(format.drmInitData);
+    SettableFuture<DrmSession> drmSessionFuture = SettableFuture.create();
+    drmListenerConditionVariable.close();
+    handler.post(
+        () -> {
+          try {
+            drmSessionManager.setPlayer(Assertions.checkNotNull(Looper.myLooper()), PlayerId.UNSET);
+            drmSessionManager.prepare();
+            try {
               drmSessionManager.setMode(licenseMode, offlineLicenseKeySetId);
-    conditionVariable.close();
+              drmSessionFuture.set(
-    DrmSession drmSession = drmSessionManager.acquireSession(eventDispatcher, format);
+                  Assertions.checkNotNull(
-    // Block current thread until key loading is finished
+                      drmSessionManager.acquireSession(eventDispatcher, format)));
-    conditionVariable.block();
+            } catch (Throwable e) {
-    return Assertions.checkNotNull(drmSession);
+              drmSessionManager.release();
+              throw e;
+            }
+          } catch (Throwable e) {
+            drmSessionFuture.setException(e);
+          }
+        });
+
+    DrmSession drmSession;
+    try {
+      drmSession = drmSessionFuture.get();
+    } catch (ExecutionException | InterruptedException e) {
+      throw new IllegalStateException(e);
+    }
+
+    // drmListenerConditionVariable will be opened by a callback to this.eventDispatcher when key
+    // loading is complete (drmSession.state == STATE_OPENED_WITH_KEYS) or has failed
+    // (drmSession.state == STATE_ERROR).
+    drmListenerConditionVariable.block();
+
+    SettableFuture<@NullableType DrmSessionException> drmSessionErrorFuture =
+        SettableFuture.create();
+    handler.post(
+        () -> {
+          try {
+            DrmSessionException drmSessionError = drmSession.getError();
+            if (drmSession.getState() == DrmSession.STATE_ERROR) {
+              drmSession.release(eventDispatcher);
+              drmSessionManager.release();
+            }
+            drmSessionErrorFuture.set(drmSessionError);
+          } catch (Throwable e) {
+            drmSessionErrorFuture.setException(e);
+            drmSession.release(eventDispatcher);
+            drmSessionManager.release();
+          }
+        });
+    try {
+      DrmSessionException drmSessionError = drmSessionErrorFuture.get();
+      if (drmSessionError != null) {
+        throw drmSessionError;
+      } else {
+        return drmSession;
+      }
+    } catch (InterruptedException | ExecutionException e) {
+      throw new IllegalStateException(e);
+    }
+  }
+
+  /**
+   * Calls {@link DrmSessionManager#release()} on {@link #handlerThread} and blocks until it's
+   * complete.
+   */
+  private void releaseManagerOnHandlerThread() {
+    SettableFuture<Void> result = SettableFuture.create();
+    handler.post(
+        () -> {
+          try {
+            drmSessionManager.release();
+            result.set(null);
+          } catch (Throwable e) {
+            result.setException(e);
+          }
+        });
+    try {
+      result.get();
+    } catch (InterruptedException | ExecutionException e) {
+      throw new IllegalStateException(e);
+    }
   }
 }

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/mediacodec/MediaCodecRenderer.java

@@ -642,14 +642,22 @@ public abstract class MediaCodecRenderer extends BaseRenderer {
   @Override
   protected void onStreamChanged(Format[] formats, long startPositionUs, long offsetUs)
       throws ExoPlaybackException {
-    if (outputStreamInfo.streamOffsetUs == C.TIME_UNSET
+    if (outputStreamInfo.streamOffsetUs == C.TIME_UNSET) {
-        || (pendingOutputStreamChanges.isEmpty()
+      // This is the first stream.
-            && lastProcessedOutputBufferTimeUs != C.TIME_UNSET
-            && lastProcessedOutputBufferTimeUs >= largestQueuedPresentationTimeUs)) {
-      // This is the first stream, or the previous has been fully output already.
       setOutputStreamInfo(
           new OutputStreamInfo(
               /* previousStreamLastBufferTimeUs= */ C.TIME_UNSET, startPositionUs, offsetUs));
+    } else if (pendingOutputStreamChanges.isEmpty()
+        && (largestQueuedPresentationTimeUs == C.TIME_UNSET
+            || (lastProcessedOutputBufferTimeUs != C.TIME_UNSET
+                && lastProcessedOutputBufferTimeUs >= largestQueuedPresentationTimeUs))) {
+      // All previous streams have never queued any samples or have been fully output already.
+      setOutputStreamInfo(
+          new OutputStreamInfo(
+              /* previousStreamLastBufferTimeUs= */ C.TIME_UNSET, startPositionUs, offsetUs));
+      if (outputStreamInfo.streamOffsetUs != C.TIME_UNSET) {
+        onProcessedStreamChange();
+      }
     } else {
       pendingOutputStreamChanges.add(
           new OutputStreamInfo(largestQueuedPresentationTimeUs, startPositionUs, offsetUs));
@@ -1581,7 +1589,7 @@ public abstract class MediaCodecRenderer extends BaseRenderer {
   @CallSuper
   protected void onProcessedOutputBuffer(long presentationTimeUs) {
     lastProcessedOutputBufferTimeUs = presentationTimeUs;
-    if (!pendingOutputStreamChanges.isEmpty()
+    while (!pendingOutputStreamChanges.isEmpty()
         && presentationTimeUs >= pendingOutputStreamChanges.peek().previousStreamLastBufferTimeUs) {
       setOutputStreamInfo(pendingOutputStreamChanges.poll());
       onProcessedStreamChange();

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/source/DefaultMediaSourceFactory.java

@@ -71,17 +71,17 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
  *   <li>{@code DashMediaSource.Factory} if the item's {@link MediaItem.LocalConfiguration#uri uri}
  *       ends in '.mpd' or if its {@link MediaItem.LocalConfiguration#mimeType mimeType field} is
  *       explicitly set to {@link MimeTypes#APPLICATION_MPD} (Requires the <a
- *       href="https://exoplayer.dev/hello-world.html#add-exoplayer-modules">exoplayer-dash module
+ *       href="https://developer.android.com/guide/topics/media/exoplayer/hello-world#add-exoplayer-modules">exoplayer-dash
- *       to be added</a> to the app).
+ *       module to be added</a> to the app).
  *   <li>{@code HlsMediaSource.Factory} if the item's {@link MediaItem.LocalConfiguration#uri uri}
  *       ends in '.m3u8' or if its {@link MediaItem.LocalConfiguration#mimeType mimeType field} is
  *       explicitly set to {@link MimeTypes#APPLICATION_M3U8} (Requires the <a
- *       href="https://exoplayer.dev/hello-world.html#add-exoplayer-modules">exoplayer-hls module to
+ *       href="https://developer.android.com/guide/topics/media/exoplayer/hello-world#add-exoplayer-modules">exoplayer-hls
- *       be added</a> to the app).
+ *       module to be added</a> to the app).
  *   <li>{@code SsMediaSource.Factory} if the item's {@link MediaItem.LocalConfiguration#uri uri}
  *       ends in '.ism', '.ism/Manifest' or if its {@link MediaItem.LocalConfiguration#mimeType
  *       mimeType field} is explicitly set to {@link MimeTypes#APPLICATION_SS} (Requires the <a
- *       href="https://exoplayer.dev/hello-world.html#add-exoplayer-modules">
+ *       href="https://developer.android.com/guide/topics/media/exoplayer/hello-world#add-exoplayer-modules">
  *       exoplayer-smoothstreaming module to be added</a> to the app).
  *   <li>{@link ProgressiveMediaSource.Factory} serves as a fallback if the item's {@link
  *       MediaItem.LocalConfiguration#uri uri} doesn't match one of the above. It tries to infer the

libraries/exoplayer/src/test/java/androidx/media3/exoplayer/mediacodec/MediaCodecRendererTest.java

@@ -214,6 +214,115 @@ public class MediaCodecRendererTest {
     inOrder.verify(renderer).onProcessedOutputBuffer(600);
   }
 
+  @Test
+  public void
+      render_withReplaceStreamAfterInitialEmptySampleStream_triggersOutputCallbacksInCorrectOrder()
+          throws Exception {
+    Format format1 =
+        new Format.Builder().setSampleMimeType(MimeTypes.AUDIO_AAC).setAverageBitrate(1000).build();
+    Format format2 =
+        new Format.Builder().setSampleMimeType(MimeTypes.AUDIO_AAC).setAverageBitrate(1500).build();
+    FakeSampleStream fakeSampleStream1 = createFakeSampleStream(format1 /* no samples */);
+    FakeSampleStream fakeSampleStream2 =
+        createFakeSampleStream(format2, /* sampleTimesUs...= */ 0, 100, 200);
+    MediaCodecRenderer renderer = spy(new TestRenderer());
+    renderer.init(/* index= */ 0, PlayerId.UNSET);
+
+    renderer.enable(
+        RendererConfiguration.DEFAULT,
+        new Format[] {format1},
+        fakeSampleStream1,
+        /* positionUs= */ 0,
+        /* joining= */ false,
+        /* mayRenderStartOfStream= */ true,
+        /* startPositionUs= */ 0,
+        /* offsetUs= */ 0);
+    renderer.start();
+    long positionUs = 0;
+    while (!renderer.hasReadStreamToEnd()) {
+      renderer.render(positionUs, SystemClock.elapsedRealtime());
+      positionUs += 100;
+    }
+    renderer.replaceStream(
+        new Format[] {format2}, fakeSampleStream2, /* startPositionUs= */ 0, /* offsetUs= */ 0);
+    renderer.setCurrentStreamFinal();
+    while (!renderer.isEnded()) {
+      renderer.render(positionUs, SystemClock.elapsedRealtime());
+      positionUs += 100;
+    }
+
+    InOrder inOrder = inOrder(renderer);
+    inOrder.verify(renderer).onOutputStreamOffsetUsChanged(0);
+    inOrder.verify(renderer).onOutputStreamOffsetUsChanged(0);
+    inOrder.verify(renderer).onProcessedStreamChange();
+    inOrder.verify(renderer).onOutputFormatChanged(eq(format2), any());
+    inOrder.verify(renderer).onProcessedOutputBuffer(0);
+    inOrder.verify(renderer).onProcessedOutputBuffer(100);
+    inOrder.verify(renderer).onProcessedOutputBuffer(200);
+  }
+
+  @Test
+  public void
+      render_withReplaceStreamAfterIntermittentEmptySampleStream_triggersOutputCallbacksInCorrectOrder()
+          throws Exception {
+    Format format1 =
+        new Format.Builder().setSampleMimeType(MimeTypes.AUDIO_AAC).setAverageBitrate(1000).build();
+    Format format2 =
+        new Format.Builder().setSampleMimeType(MimeTypes.AUDIO_AAC).setAverageBitrate(1500).build();
+    Format format3 =
+        new Format.Builder().setSampleMimeType(MimeTypes.AUDIO_AAC).setAverageBitrate(2000).build();
+    FakeSampleStream fakeSampleStream1 =
+        createFakeSampleStream(format1, /* sampleTimesUs...= */ 0, 100);
+    FakeSampleStream fakeSampleStream2 = createFakeSampleStream(format2 /* no samples */);
+    FakeSampleStream fakeSampleStream3 =
+        createFakeSampleStream(format3, /* sampleTimesUs...= */ 0, 100, 200);
+    MediaCodecRenderer renderer = spy(new TestRenderer());
+    renderer.init(/* index= */ 0, PlayerId.UNSET);
+
+    renderer.enable(
+        RendererConfiguration.DEFAULT,
+        new Format[] {format1},
+        fakeSampleStream1,
+        /* positionUs= */ 0,
+        /* joining= */ false,
+        /* mayRenderStartOfStream= */ true,
+        /* startPositionUs= */ 0,
+        /* offsetUs= */ 0);
+    renderer.start();
+    long positionUs = 0;
+    while (!renderer.hasReadStreamToEnd()) {
+      renderer.render(positionUs, SystemClock.elapsedRealtime());
+      positionUs += 100;
+    }
+    renderer.replaceStream(
+        new Format[] {format2}, fakeSampleStream2, /* startPositionUs= */ 200, /* offsetUs= */ 200);
+    while (!renderer.hasReadStreamToEnd()) {
+      renderer.render(positionUs, SystemClock.elapsedRealtime());
+      positionUs += 100;
+    }
+    renderer.replaceStream(
+        new Format[] {format3}, fakeSampleStream3, /* startPositionUs= */ 200, /* offsetUs= */ 200);
+    renderer.setCurrentStreamFinal();
+    while (!renderer.isEnded()) {
+      renderer.render(positionUs, SystemClock.elapsedRealtime());
+      positionUs += 100;
+    }
+
+    InOrder inOrder = inOrder(renderer);
+    inOrder.verify(renderer).onOutputStreamOffsetUsChanged(0);
+    inOrder.verify(renderer).onOutputFormatChanged(eq(format1), any());
+    inOrder.verify(renderer).onProcessedOutputBuffer(0);
+    inOrder.verify(renderer).onProcessedOutputBuffer(100);
+    inOrder.verify(renderer).onOutputStreamOffsetUsChanged(200);
+    inOrder.verify(renderer).onProcessedStreamChange();
+    inOrder.verify(renderer).onOutputStreamOffsetUsChanged(200);
+    inOrder.verify(renderer).onProcessedStreamChange();
+    inOrder.verify(renderer).onOutputFormatChanged(eq(format3), any());
+    inOrder.verify(renderer).onProcessedOutputBuffer(200);
+    inOrder.verify(renderer).onProcessedOutputBuffer(300);
+    inOrder.verify(renderer).onProcessedOutputBuffer(400);
+  }
+
   private FakeSampleStream createFakeSampleStream(Format format, long... sampleTimesUs) {
     ImmutableList.Builder<FakeSampleStream.FakeSampleStreamItem> sampleListBuilder =
         ImmutableList.builder();

libraries/exoplayer_dash/src/main/java/androidx/media3/exoplayer/dash/DefaultDashChunkSource.java

@@ -236,9 +236,12 @@ public class DefaultDashChunkSource implements DashChunkSource {
     // Segments are aligned across representations, so any segment index will do.
     for (RepresentationHolder representationHolder : representationHolders) {
       if (representationHolder.segmentIndex != null) {
+        long segmentCount = representationHolder.getSegmentCount();
+        if (segmentCount == 0) {
+          continue;
+        }
         long segmentNum = representationHolder.getSegmentNum(positionUs);
         long firstSyncUs = representationHolder.getSegmentStartTimeUs(segmentNum);
-        long segmentCount = representationHolder.getSegmentCount();
         long secondSyncUs =
             firstSyncUs < positionUs
                     && (segmentCount == DashSegmentIndex.INDEX_UNBOUNDED
@@ -594,7 +597,7 @@ public class DefaultDashChunkSource implements DashChunkSource {
   }
 
   private long getAvailableLiveDurationUs(long nowUnixTimeUs, long playbackPositionUs) {
-    if (!manifest.dynamic) {
+    if (!manifest.dynamic || representationHolders[0].getSegmentCount() == 0) {
       return C.TIME_UNSET;
     }
     long lastSegmentNum = representationHolders[0].getLastAvailableSegmentNum(nowUnixTimeUs);

libraries/exoplayer_ima/README.md

@@ -26,7 +26,7 @@ locally. Instructions for doing this can be found in the [top level README][].
 ## Using the module
 
 To use the module, follow the instructions on the
-[Ad insertion page](https://exoplayer.dev/ad-insertion.html#declarative-ad-support)
+[Ad insertion page](https://developer.android.com/guide/topics/media/exoplayer/ad-insertion#declarative-ad-support)
 of the developer guide. The `AdsLoaderProvider` passed to the player's
 `DefaultMediaSourceFactory` should return an `ImaAdsLoader`. Note that the IMA
 module only supports players that are accessed on the application's main thread.

libraries/exoplayer_ima/src/main/java/androidx/media3/exoplayer/ima/ImaAdsLoader.java

@@ -273,7 +273,7 @@ public final class ImaAdsLoader implements AdsLoader {
     /**
      * Sets the duration in milliseconds for which the player must buffer while preloading an ad
      * group before that ad group is skipped and marked as having failed to load. Pass {@link
-     * C#TIME_UNSET} if there should be no such timeout. The default value is {@value
+     * C#TIME_UNSET} if there should be no such timeout. The default value is {@link
      * #DEFAULT_AD_PRELOAD_TIMEOUT_MS} ms.
      *
      * <p>The purpose of this timeout is to avoid playback getting stuck in the unexpected case that

libraries/exoplayer_rtsp/src/main/java/androidx/media3/exoplayer/rtsp/RtspClient.java

@@ -49,6 +49,7 @@ import androidx.media3.common.util.Log;
 import androidx.media3.common.util.Util;
 import androidx.media3.exoplayer.rtsp.RtspMediaPeriod.RtpLoadInfo;
 import androidx.media3.exoplayer.rtsp.RtspMediaSource.RtspPlaybackException;
+import androidx.media3.exoplayer.rtsp.RtspMediaSource.RtspUdpUnsupportedTransportException;
 import androidx.media3.exoplayer.rtsp.RtspMessageChannel.InterleavedBinaryDataListener;
 import androidx.media3.exoplayer.rtsp.RtspMessageUtil.RtspAuthUserInfo;
 import androidx.media3.exoplayer.rtsp.RtspMessageUtil.RtspSessionHeader;
@@ -577,8 +578,24 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
               receivedAuthorizationRequest = true;
               return;
             }
-            // fall through: if unauthorized and no userInfo present, or previous authentication
+            // if unauthorized and no userInfo present, or previous authentication
-            // unsuccessful.
+            // unsuccessful, then dispatch RtspPlaybackException
+            dispatchRtspError(
+                new RtspPlaybackException(
+                    RtspMessageUtil.toMethodString(requestMethod) + " " + response.status));
+            return;
+          case 461:
+            String exceptionMessage =
+                RtspMessageUtil.toMethodString(requestMethod) + " " + response.status;
+            // If request was SETUP with UDP transport protocol, then throw
+            // RtspUdpUnsupportedTransportException.
+            String transportHeaderValue =
+                checkNotNull(matchingRequest.headers.get(RtspHeaders.TRANSPORT));
+            dispatchRtspError(
+                requestMethod == METHOD_SETUP && !transportHeaderValue.contains("TCP")
+                    ? new RtspUdpUnsupportedTransportException(exceptionMessage)
+                    : new RtspPlaybackException(exceptionMessage));
+            return;
           default:
             dispatchRtspError(
                 new RtspPlaybackException(

libraries/exoplayer_rtsp/src/main/java/androidx/media3/exoplayer/rtsp/RtspMediaPeriod.java

@@ -518,7 +518,6 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
           // using TCP. Retrying will setup new loadables, so will not retry with the current
           // loadables.
           retryWithRtpTcp();
-          isUsingRtpTcp = true;
         }
         return;
       }
@@ -644,8 +643,14 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
 
     @Override
     public void onPlaybackError(RtspPlaybackException error) {
+      if (error instanceof RtspMediaSource.RtspUdpUnsupportedTransportException && !isUsingRtpTcp) {
+        // Retry playback with TCP if we receive RtspUdpUnsupportedTransportException, and we are
+        // not already using TCP. Retrying will setup new loadables.
+        retryWithRtpTcp();
+      } else {
         playbackException = error;
       }
+    }
 
     @Override
     public void onSessionTimelineUpdated(
@@ -668,6 +673,9 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
   }
 
   private void retryWithRtpTcp() {
+    // Retry should only run once.
+    isUsingRtpTcp = true;
+
     rtspClient.retryWithRtpTcp();
 
     @Nullable

libraries/exoplayer_rtsp/src/main/java/androidx/media3/exoplayer/rtsp/RtspMediaSource.java

@@ -192,7 +192,7 @@ public final class RtspMediaSource extends BaseMediaSource {
   }
 
   /** Thrown when an exception or error is encountered during loading an RTSP stream. */
-  public static final class RtspPlaybackException extends IOException {
+  public static class RtspPlaybackException extends IOException {
     public RtspPlaybackException(String message) {
       super(message);
     }
@@ -206,6 +206,13 @@ public final class RtspMediaSource extends BaseMediaSource {
     }
   }
 
+  /** Thrown when an RTSP Unsupported Transport error (461) is encountered during RTSP Setup. */
+  public static final class RtspUdpUnsupportedTransportException extends RtspPlaybackException {
+    public RtspUdpUnsupportedTransportException(String message) {
+      super(message);
+    }
+  }
+
   private final MediaItem mediaItem;
   private final RtpDataChannel.Factory rtpDataChannelFactory;
   private final String userAgent;

libraries/exoplayer_rtsp/src/test/java/androidx/media3/exoplayer/rtsp/RtspClientTest.java

@@ -453,4 +453,77 @@ public final class RtspClientTest {
     RobolectricUtil.runMainLooperUntil(timelineRequestFailed::get);
     assertThat(rtspClient.getState()).isEqualTo(RtspClient.RTSP_STATE_UNINITIALIZED);
   }
+
+  @Test
+  public void connectServerAndClient_describeResponseRequiresAuthentication_doesNotUpdateTimeline()
+      throws Exception {
+    class ResponseProvider implements RtspServer.ResponseProvider {
+      @Override
+      public RtspResponse getOptionsResponse() {
+        return new RtspResponse(
+            /* status= */ 200,
+            new RtspHeaders.Builder().add(RtspHeaders.PUBLIC, "OPTIONS, DESCRIBE").build());
+      }
+
+      @Override
+      public RtspResponse getDescribeResponse(Uri requestedUri, RtspHeaders headers) {
+        String authorizationHeader = headers.get(RtspHeaders.AUTHORIZATION);
+        if (authorizationHeader == null) {
+          return new RtspResponse(
+              /* status= */ 401,
+              new RtspHeaders.Builder()
+                  .add(RtspHeaders.CSEQ, headers.get(RtspHeaders.CSEQ))
+                  .add(
+                      RtspHeaders.WWW_AUTHENTICATE,
+                      "Digest realm=\"RTSP server\","
+                          + " nonce=\"0cdfe9719e7373b7d5bb2913e2115f3f\","
+                          + " opaque=\"5ccc069c403ebaf9f0171e9517f40e41\"")
+                  .add(RtspHeaders.WWW_AUTHENTICATE, "BASIC realm=\"WallyWorld\"")
+                  .build());
+        }
+        if (!authorizationHeader.contains("Digest")) {
+          return new RtspResponse(
+              401,
+              new RtspHeaders.Builder()
+                  .add(RtspHeaders.CSEQ, headers.get(RtspHeaders.CSEQ))
+                  .build());
+        }
+
+        return RtspTestUtils.newDescribeResponseWithSdpMessage(
+            "v=0\r\n"
+                + "o=- 1606776316530225 1 IN IP4 127.0.0.1\r\n"
+                + "s=Exoplayer test\r\n"
+                + "t=0 0\r\n"
+                // The session is 50.46s long.
+                + "a=range:npt=0-50.46\r\n",
+            rtpPacketStreamDumps,
+            requestedUri);
+      }
+    }
+    rtspServer = new RtspServer(new ResponseProvider());
+
+    AtomicBoolean timelineRequestFailed = new AtomicBoolean();
+    rtspClient =
+        new RtspClient(
+            new SessionInfoListener() {
+              @Override
+              public void onSessionTimelineUpdated(
+                  RtspSessionTiming timing, ImmutableList<RtspMediaTrack> tracks) {}
+
+              @Override
+              public void onSessionTimelineRequestFailed(
+                  String message, @Nullable Throwable cause) {
+                timelineRequestFailed.set(true);
+              }
+            },
+            EMPTY_PLAYBACK_LISTENER,
+            /* userAgent= */ "ExoPlayer:RtspClientTest",
+            RtspTestUtils.getTestUri(rtspServer.startAndGetPortNumber()),
+            SocketFactory.getDefault(),
+            /* debugLoggingEnabled= */ false);
+    rtspClient.start();
+
+    RobolectricUtil.runMainLooperUntil(timelineRequestFailed::get);
+    assertThat(rtspClient.getState()).isEqualTo(RtspClient.RTSP_STATE_UNINITIALIZED);
+  }
 }

libraries/exoplayer_rtsp/src/test/java/androidx/media3/exoplayer/rtsp/RtspPlaybackTest.java

@@ -15,6 +15,7 @@
  */
 package androidx.media3.exoplayer.rtsp;
 
+import static androidx.media3.common.util.Assertions.checkNotNull;
 import static androidx.media3.common.util.Assertions.checkStateNotNull;
 import static com.google.common.truth.Truth.assertThat;
 import static java.lang.Math.min;
@@ -42,11 +43,13 @@ import androidx.media3.test.utils.robolectric.TestPlayerRunHelper;
 import androidx.test.core.app.ApplicationProvider;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
 import com.google.common.collect.ImmutableList;
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.concurrent.ConcurrentLinkedQueue;
 import java.util.concurrent.atomic.AtomicReference;
 import javax.net.SocketFactory;
+import org.junit.After;
 import org.junit.Before;
 import org.junit.Rule;
 import org.junit.Test;
@@ -58,30 +61,20 @@ import org.robolectric.annotation.Config;
 @RunWith(AndroidJUnit4.class)
 public final class RtspPlaybackTest {
 
+  private static final long DEFAULT_TIMEOUT_MS = 8000;
   private static final String SESSION_DESCRIPTION =
       "v=0\r\n"
           + "o=- 1606776316530225 1 IN IP4 127.0.0.1\r\n"
           + "s=Exoplayer test\r\n"
           + "t=0 0\r\n";
 
-  private final Context applicationContext;
+  private Context applicationContext;
-  private final CapturingRenderersFactory capturingRenderersFactory;
+  private CapturingRenderersFactory capturingRenderersFactory;
-  private final Clock clock;
+  private Clock clock;
-  private final FakeUdpDataSourceRtpDataChannel fakeRtpDataChannel;
-  private final RtpDataChannel.Factory rtpDataChannelFactory;
-
   private RtpPacketStreamDump aacRtpPacketStreamDump;
   // ExoPlayer does not support extracting MP4A-LATM RTP payload at the moment.
   private RtpPacketStreamDump mpeg2tsRtpPacketStreamDump;
-
+  private RtspServer rtspServer;
-  /** Creates a new instance. */
-  public RtspPlaybackTest() {
-    applicationContext = ApplicationProvider.getApplicationContext();
-    capturingRenderersFactory = new CapturingRenderersFactory(applicationContext);
-    clock = new FakeClock(/* isAutoAdvancing= */ true);
-    fakeRtpDataChannel = new FakeUdpDataSourceRtpDataChannel();
-    rtpDataChannelFactory = (trackId) -> fakeRtpDataChannel;
-  }
 
   @Rule
   public ShadowMediaCodecConfig mediaCodecConfig =
@@ -89,20 +82,29 @@ public final class RtspPlaybackTest {
 
   @Before
   public void setUp() throws Exception {
+    applicationContext = ApplicationProvider.getApplicationContext();
+    capturingRenderersFactory = new CapturingRenderersFactory(applicationContext);
+    clock = new FakeClock(/* isAutoAdvancing= */ true);
     aacRtpPacketStreamDump = RtspTestUtils.readRtpPacketStreamDump("media/rtsp/aac-dump.json");
     mpeg2tsRtpPacketStreamDump =
         RtspTestUtils.readRtpPacketStreamDump("media/rtsp/mpeg2ts-dump.json");
   }
 
+  @After
+  public void tearDown() {
+    Util.closeQuietly(rtspServer);
+  }
+
   @Test
   public void prepare_withSupportedTrack_playsTrackUntilEnded() throws Exception {
+    FakeUdpDataSourceRtpDataChannel fakeRtpDataChannel = new FakeUdpDataSourceRtpDataChannel();
+    RtpDataChannel.Factory rtpDataChannelFactory = (trackId) -> fakeRtpDataChannel;
     ResponseProvider responseProvider =
         new ResponseProvider(
             clock,
             ImmutableList.of(aacRtpPacketStreamDump, mpeg2tsRtpPacketStreamDump),
             fakeRtpDataChannel);
-
+    rtspServer = new RtspServer(responseProvider);
-    try (RtspServer rtspServer = new RtspServer(responseProvider)) {
     ExoPlayer player = createExoPlayer(rtspServer.startAndGetPortNumber(), rtpDataChannelFactory);
 
     PlaybackOutput playbackOutput = PlaybackOutput.register(player, capturingRenderersFactory);
@@ -113,18 +115,17 @@ public final class RtspPlaybackTest {
 
     // Only setup the supported track (aac).
     assertThat(responseProvider.getDumpsForSetUpTracks()).containsExactly(aacRtpPacketStreamDump);
-      DumpFileAsserts.assertOutput(
+    DumpFileAsserts.assertOutput(applicationContext, playbackOutput, "playbackdumps/rtsp/aac.dump");
-          applicationContext, playbackOutput, "playbackdumps/rtsp/aac.dump");
-    }
   }
 
   @Test
   public void prepare_noSupportedTrack_throwsPreparationError() throws Exception {
-
+    FakeUdpDataSourceRtpDataChannel fakeRtpDataChannel = new FakeUdpDataSourceRtpDataChannel();
-    try (RtspServer rtspServer =
+    RtpDataChannel.Factory rtpDataChannelFactory = (trackId) -> fakeRtpDataChannel;
+    rtspServer =
         new RtspServer(
             new ResponseProvider(
-                clock, ImmutableList.of(mpeg2tsRtpPacketStreamDump), fakeRtpDataChannel))) {
+                clock, ImmutableList.of(mpeg2tsRtpPacketStreamDump), fakeRtpDataChannel));
     ExoPlayer player = createExoPlayer(rtspServer.startAndGetPortNumber(), rtpDataChannelFactory);
 
     AtomicReference<Throwable> playbackError = new AtomicReference<>();
@@ -139,11 +140,104 @@ public final class RtspPlaybackTest {
     RobolectricUtil.runMainLooperUntil(() -> playbackError.get() != null);
     player.release();
 
+    assertThat(playbackError.get()).hasCauseThat().hasMessageThat().contains("No playable track.");
+  }
+
+  @Test
+  public void prepare_withUdpUnsupportedWithFallback_fallsbackToTcpAndPlaysUntilEnd()
+      throws Exception {
+    FakeTcpDataSourceRtpDataChannel fakeTcpRtpDataChannel = new FakeTcpDataSourceRtpDataChannel();
+    RtpDataChannel.Factory rtpTcpDataChannelFactory = (trackId) -> fakeTcpRtpDataChannel;
+    ResponseProviderSupportingOnlyTcp responseProviderSupportingOnlyTcp =
+        new ResponseProviderSupportingOnlyTcp(
+            clock,
+            ImmutableList.of(aacRtpPacketStreamDump, mpeg2tsRtpPacketStreamDump),
+            fakeTcpRtpDataChannel);
+    ForwardingRtpDataChannelFactory forwardingRtpDataChannelFactory =
+        new ForwardingRtpDataChannelFactory(
+            new UdpDataSourceRtpDataChannelFactory(DEFAULT_TIMEOUT_MS), rtpTcpDataChannelFactory);
+    rtspServer = new RtspServer(responseProviderSupportingOnlyTcp);
+    ExoPlayer player =
+        createExoPlayer(rtspServer.startAndGetPortNumber(), forwardingRtpDataChannelFactory);
+
+    PlaybackOutput playbackOutput = PlaybackOutput.register(player, capturingRenderersFactory);
+    player.prepare();
+    player.play();
+    TestPlayerRunHelper.runUntilPlaybackState(player, Player.STATE_ENDED);
+    player.release();
+
+    // Only setup the supported track (aac).
+    assertThat(responseProviderSupportingOnlyTcp.getDumpsForSetUpTracks())
+        .containsExactly(aacRtpPacketStreamDump);
+    DumpFileAsserts.assertOutput(applicationContext, playbackOutput, "playbackdumps/rtsp/aac.dump");
+  }
+
+  @Test
+  public void prepare_withUdpUnsupportedWithoutFallback_throwsRtspPlaybackException()
+      throws Exception {
+    FakeUdpDataSourceRtpDataChannel fakeUdpRtpDataChannel = new FakeUdpDataSourceRtpDataChannel();
+    RtpDataChannel.Factory rtpDataChannelFactory = (trackId) -> fakeUdpRtpDataChannel;
+    ResponseProviderSupportingOnlyTcp responseProvider =
+        new ResponseProviderSupportingOnlyTcp(
+            clock,
+            ImmutableList.of(aacRtpPacketStreamDump, mpeg2tsRtpPacketStreamDump),
+            fakeUdpRtpDataChannel);
+    rtspServer = new RtspServer(responseProvider);
+    ExoPlayer player = createExoPlayer(rtspServer.startAndGetPortNumber(), rtpDataChannelFactory);
+
+    AtomicReference<PlaybackException> playbackError = new AtomicReference<>();
+    player.prepare();
+    player.addListener(
+        new Listener() {
+          @Override
+          public void onPlayerError(PlaybackException error) {
+            playbackError.set(error);
+          }
+        });
+    RobolectricUtil.runMainLooperUntil(() -> playbackError.get() != null);
+    player.release();
+
+    assertThat(playbackError.get())
+        .hasCauseThat()
+        .isInstanceOf(RtspMediaSource.RtspPlaybackException.class);
     assertThat(playbackError.get())
         .hasCauseThat()
         .hasMessageThat()
-          .contains("No playable track.");
+        .contains("No fallback data channel factory for TCP retry");
   }
+
+  @Test
+  public void prepare_withUdpUnsupportedWithUdpFallback_throwsRtspUdpUnsupportedTransportException()
+      throws Exception {
+    FakeUdpDataSourceRtpDataChannel fakeUdpRtpDataChannel = new FakeUdpDataSourceRtpDataChannel();
+    RtpDataChannel.Factory rtpDataChannelFactory = (trackId) -> fakeUdpRtpDataChannel;
+    ResponseProviderSupportingOnlyTcp responseProviderSupportingOnlyTcp =
+        new ResponseProviderSupportingOnlyTcp(
+            clock,
+            ImmutableList.of(aacRtpPacketStreamDump, mpeg2tsRtpPacketStreamDump),
+            fakeUdpRtpDataChannel);
+    ForwardingRtpDataChannelFactory forwardingRtpDataChannelFactory =
+        new ForwardingRtpDataChannelFactory(rtpDataChannelFactory, rtpDataChannelFactory);
+    rtspServer = new RtspServer(responseProviderSupportingOnlyTcp);
+    ExoPlayer player =
+        createExoPlayer(rtspServer.startAndGetPortNumber(), forwardingRtpDataChannelFactory);
+
+    AtomicReference<PlaybackException> playbackError = new AtomicReference<>();
+    player.prepare();
+    player.addListener(
+        new Listener() {
+          @Override
+          public void onPlayerError(PlaybackException error) {
+            playbackError.set(error);
+          }
+        });
+    RobolectricUtil.runMainLooperUntil(() -> playbackError.get() != null);
+    player.release();
+
+    assertThat(playbackError.get())
+        .hasCauseThat()
+        .isInstanceOf(RtspMediaSource.RtspUdpUnsupportedTransportException.class);
+    assertThat(playbackError.get()).hasCauseThat().hasMessageThat().isEqualTo("SETUP 461");
   }
 
   private ExoPlayer createExoPlayer(
@@ -163,16 +257,16 @@ public final class RtspPlaybackTest {
     return player;
   }
 
-  private static final class ResponseProvider implements RtspServer.ResponseProvider {
+  private static class ResponseProvider implements RtspServer.ResponseProvider {
 
-    private static final String SESSION_ID = "00000000";
+    protected static final String SESSION_ID = "00000000";
 
-    private final Clock clock;
+    protected final Clock clock;
-    private final ArrayList<RtpPacketStreamDump> dumpsForSetUpTracks;
+    protected final ArrayList<RtpPacketStreamDump> dumpsForSetUpTracks;
-    private final ImmutableList<RtpPacketStreamDump> rtpPacketStreamDumps;
+    protected final ImmutableList<RtpPacketStreamDump> rtpPacketStreamDumps;
     private final RtspMessageChannel.InterleavedBinaryDataListener binaryDataListener;
 
-    private RtpPacketTransmitter packetTransmitter;
+    protected RtpPacketTransmitter packetTransmitter;
 
     /**
      * Creates a new instance.
@@ -240,22 +334,54 @@ public final class RtspPlaybackTest {
     }
   }
 
-  private static final class FakeUdpDataSourceRtpDataChannel extends BaseDataSource
+  private static final class ResponseProviderSupportingOnlyTcp extends ResponseProvider {
-      implements RtpDataChannel, RtspMessageChannel.InterleavedBinaryDataListener {
 
-    private static final int LOCAL_PORT = 40000;
+    /**
+     * Creates a new instance.
+     *
+     * @param clock The {@link Clock} used in the test.
+     * @param rtpPacketStreamDumps A list of {@link RtpPacketStreamDump}.
+     * @param binaryDataListener A {@link RtspMessageChannel.InterleavedBinaryDataListener} to send
+     *     RTP data.
+     */
+    public ResponseProviderSupportingOnlyTcp(
+        Clock clock,
+        List<RtpPacketStreamDump> rtpPacketStreamDumps,
+        RtspMessageChannel.InterleavedBinaryDataListener binaryDataListener) {
+      super(clock, rtpPacketStreamDumps, binaryDataListener);
+    }
+
+    @Override
+    public RtspResponse getSetupResponse(Uri requestedUri, RtspHeaders headers) {
+      String transportHeaderValue = checkNotNull(headers.get(RtspHeaders.TRANSPORT));
+      if (!transportHeaderValue.contains("TCP")) {
+        return new RtspResponse(
+            /* status= */ 461, headers.buildUpon().add(RtspHeaders.SESSION, SESSION_ID).build());
+      }
+      for (RtpPacketStreamDump rtpPacketStreamDump : rtpPacketStreamDumps) {
+        if (requestedUri.toString().contains(rtpPacketStreamDump.trackName)) {
+          dumpsForSetUpTracks.add(rtpPacketStreamDump);
+          packetTransmitter = new RtpPacketTransmitter(rtpPacketStreamDump, clock);
+        }
+      }
+      return new RtspResponse(
+          /* status= */ 200, headers.buildUpon().add(RtspHeaders.SESSION, SESSION_ID).build());
+    }
+  }
+
+  private abstract static class FakeBaseDataSourceRtpDataChannel extends BaseDataSource
+      implements RtpDataChannel, RtspMessageChannel.InterleavedBinaryDataListener {
+    protected static final int LOCAL_PORT = 40000;
 
     private final ConcurrentLinkedQueue<byte[]> packetQueue;
 
-    public FakeUdpDataSourceRtpDataChannel() {
+    public FakeBaseDataSourceRtpDataChannel() {
       super(/* isNetwork= */ false);
       packetQueue = new ConcurrentLinkedQueue<>();
     }
 
     @Override
-    public String getTransport() {
+    public abstract String getTransport();
-      return Util.formatInvariant("RTP/AVP;unicast;client_port=%d-%d", LOCAL_PORT, LOCAL_PORT + 1);
-    }
 
     @Override
     public int getLocalPort() {
@@ -307,4 +433,49 @@ public final class RtspPlaybackTest {
       return byteToRead;
     }
   }
+
+  private static final class FakeUdpDataSourceRtpDataChannel
+      extends FakeBaseDataSourceRtpDataChannel {
+    @Override
+    public String getTransport() {
+      return Util.formatInvariant("RTP/AVP;unicast;client_port=%d-%d", LOCAL_PORT, LOCAL_PORT + 1);
+    }
+
+    @Override
+    public RtspMessageChannel.InterleavedBinaryDataListener getInterleavedBinaryDataListener() {
+      return null;
+    }
+  }
+
+  private static final class FakeTcpDataSourceRtpDataChannel
+      extends FakeBaseDataSourceRtpDataChannel {
+    @Override
+    public String getTransport() {
+      return Util.formatInvariant(
+          "RTP/AVP/TCP;unicast;interleaved=%d-%d", LOCAL_PORT + 2, LOCAL_PORT + 3);
+    }
+  }
+
+  private static class ForwardingRtpDataChannelFactory implements RtpDataChannel.Factory {
+
+    private final RtpDataChannel.Factory rtpChannelFactory;
+    private final RtpDataChannel.Factory rtpFallbackChannelFactory;
+
+    public ForwardingRtpDataChannelFactory(
+        RtpDataChannel.Factory rtpChannelFactory,
+        RtpDataChannel.Factory rtpFallbackChannelFactory) {
+      this.rtpChannelFactory = rtpChannelFactory;
+      this.rtpFallbackChannelFactory = rtpFallbackChannelFactory;
+    }
+
+    @Override
+    public RtpDataChannel createAndOpenDataChannel(int trackId) throws IOException {
+      return rtpChannelFactory.createAndOpenDataChannel(trackId);
+    }
+
+    @Override
+    public RtpDataChannel.Factory createFallbackDataChannelFactory() {
+      return rtpFallbackChannelFactory;
+    }
+  }
 }

libraries/extractor/src/main/java/androidx/media3/extractor/HevcConfig.java

@@ -16,6 +16,7 @@
 package androidx.media3.extractor;
 
 import androidx.annotation.Nullable;
+import androidx.media3.common.C;
 import androidx.media3.common.Format;
 import androidx.media3.common.ParserException;
 import androidx.media3.common.util.CodecSpecificDataUtil;
@@ -61,6 +62,9 @@ public final class HevcConfig {
       int bufferPosition = 0;
       int width = Format.NO_VALUE;
       int height = Format.NO_VALUE;
+      @C.ColorSpace int colorSpace = Format.NO_VALUE;
+      @C.ColorRange int colorRange = Format.NO_VALUE;
+      @C.ColorTransfer int colorTransfer = Format.NO_VALUE;
       float pixelWidthHeightRatio = 1;
       @Nullable String codecs = null;
       for (int i = 0; i < numberOfArrays; i++) {
@@ -84,6 +88,9 @@ public final class HevcConfig {
                     buffer, bufferPosition, bufferPosition + nalUnitLength);
             width = spsData.width;
             height = spsData.height;
+            colorSpace = spsData.colorSpace;
+            colorRange = spsData.colorRange;
+            colorTransfer = spsData.colorTransfer;
             pixelWidthHeightRatio = spsData.pixelWidthHeightRatio;
             codecs =
                 CodecSpecificDataUtil.buildHevcCodecString(
@@ -102,7 +109,15 @@ public final class HevcConfig {
       List<byte[]> initializationData =
           csdLength == 0 ? Collections.emptyList() : Collections.singletonList(buffer);
       return new HevcConfig(
-          initializationData, lengthSizeMinusOne + 1, width, height, pixelWidthHeightRatio, codecs);
+          initializationData,
+          lengthSizeMinusOne + 1,
+          width,
+          height,
+          pixelWidthHeightRatio,
+          codecs,
+          colorSpace,
+          colorRange,
+          colorTransfer);
     } catch (ArrayIndexOutOfBoundsException e) {
       throw ParserException.createForMalformedContainer("Error parsing HEVC config", e);
     }
@@ -129,6 +144,22 @@ public final class HevcConfig {
   /** The pixel width to height ratio. */
   public final float pixelWidthHeightRatio;
 
+  /**
+   * The {@link C.ColorSpace} of the video or {@link Format#NO_VALUE} if unknown or not applicable.
+   */
+  public final @C.ColorSpace int colorSpace;
+
+  /**
+   * The {@link C.ColorRange} of the video or {@link Format#NO_VALUE} if unknown or not applicable.
+   */
+  public final @C.ColorRange int colorRange;
+
+  /**
+   * The {@link C.ColorTransfer} of the video or {@link Format#NO_VALUE} if unknown or not
+   * applicable.
+   */
+  public final @C.ColorTransfer int colorTransfer;
+
   /**
    * An RFC 6381 codecs string representing the video format, or {@code null} if not known.
    *
@@ -142,12 +173,18 @@ public final class HevcConfig {
       int width,
       int height,
       float pixelWidthHeightRatio,
-      @Nullable String codecs) {
+      @Nullable String codecs,
+      @C.ColorSpace int colorSpace,
+      @C.ColorRange int colorRange,
+      @C.ColorTransfer int colorTransfer) {
     this.initializationData = initializationData;
     this.nalUnitLengthFieldLength = nalUnitLengthFieldLength;
     this.width = width;
     this.height = height;
     this.pixelWidthHeightRatio = pixelWidthHeightRatio;
     this.codecs = codecs;
+    this.colorSpace = colorSpace;
+    this.colorRange = colorRange;
+    this.colorTransfer = colorTransfer;
   }
 }

libraries/extractor/src/main/java/androidx/media3/extractor/NalUnitUtil.java

@@ -19,6 +19,8 @@ import static java.lang.Math.min;
 
 import androidx.annotation.Nullable;
 import androidx.media3.common.C;
+import androidx.media3.common.ColorInfo;
+import androidx.media3.common.Format;
 import androidx.media3.common.MimeTypes;
 import androidx.media3.common.util.Assertions;
 import androidx.media3.common.util.Log;
@@ -110,6 +112,9 @@ public final class NalUnitUtil {
     public final int width;
     public final int height;
     public final float pixelWidthHeightRatio;
+    public final @C.ColorSpace int colorSpace;
+    public final @C.ColorRange int colorRange;
+    public final @C.ColorTransfer int colorTransfer;
 
     public H265SpsData(
         int generalProfileSpace,
@@ -121,7 +126,10 @@ public final class NalUnitUtil {
         int seqParameterSetId,
         int width,
         int height,
-        float pixelWidthHeightRatio) {
+        float pixelWidthHeightRatio,
+        @C.ColorSpace int colorSpace,
+        @C.ColorRange int colorRange,
+        @C.ColorTransfer int colorTransfer) {
       this.generalProfileSpace = generalProfileSpace;
       this.generalTierFlag = generalTierFlag;
       this.generalProfileIdc = generalProfileIdc;
@@ -132,6 +140,9 @@ public final class NalUnitUtil {
       this.width = width;
       this.height = height;
       this.pixelWidthHeightRatio = pixelWidthHeightRatio;
+      this.colorSpace = colorSpace;
+      this.colorRange = colorRange;
+      this.colorTransfer = colorTransfer;
     }
   }
 
@@ -488,6 +499,10 @@ public final class NalUnitUtil {
   public static H265SpsData parseH265SpsNalUnitPayload(
       byte[] nalData, int nalOffset, int nalLimit) {
     ParsableNalUnitBitArray data = new ParsableNalUnitBitArray(nalData, nalOffset, nalLimit);
+    // HDR related metadata.
+    @C.ColorSpace int colorSpace = Format.NO_VALUE;
+    @C.ColorRange int colorRange = Format.NO_VALUE;
+    @C.ColorTransfer int colorTransfer = Format.NO_VALUE;
     data.skipBits(4); // sps_video_parameter_set_id
     int maxSubLayersMinus1 = data.readBits(3);
     data.skipBit(); // sps_temporal_id_nesting_flag
@@ -594,10 +609,17 @@ public final class NalUnitUtil {
         data.skipBit(); // overscan_appropriate_flag
       }
       if (data.readBit()) { // video_signal_type_present_flag
-        data.skipBits(4); // video_format, video_full_range_flag
+        data.skipBits(3); // video_format
+        boolean fullRangeFlag = data.readBit(); // video_full_range_flag
         if (data.readBit()) { // colour_description_present_flag
-          // colour_primaries, transfer_characteristics, matrix_coeffs
+          int colorPrimaries = data.readBits(8); // colour_primaries
-          data.skipBits(24);
+          int transferCharacteristics = data.readBits(8); // transfer_characteristics
+          data.skipBits(8); // matrix_coeffs
+
+          colorSpace = ColorInfo.isoColorPrimariesToColorSpace(colorPrimaries);
+          colorRange = fullRangeFlag ? C.COLOR_RANGE_FULL : C.COLOR_RANGE_LIMITED;
+          colorTransfer =
+              ColorInfo.isoTransferCharacteristicsToColorTransfer(transferCharacteristics);
         }
       }
       if (data.readBit()) { // chroma_loc_info_present_flag
@@ -622,7 +644,10 @@ public final class NalUnitUtil {
         seqParameterSetId,
         frameWidth,
         frameHeight,
-        pixelWidthHeightRatio);
+        pixelWidthHeightRatio,
+        colorSpace,
+        colorRange,
+        colorTransfer);
   }
 
   /**

libraries/extractor/src/main/java/androidx/media3/extractor/mp4/Atom.java

@@ -176,6 +176,9 @@ import java.util.List;
   @SuppressWarnings("ConstantCaseForConstants")
   public static final int TYPE_ddts = 0x64647473;
 
+  @SuppressWarnings("ConstantCaseForConstants")
+  public static final int TYPE_udts = 0x75647473;
+
   @SuppressWarnings("ConstantCaseForConstants")
   public static final int TYPE_tfdt = 0x74666474;
 

libraries/extractor/src/main/java/androidx/media3/extractor/mp4/AtomParsers.java

@@ -1164,6 +1164,9 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
           pixelWidthHeightRatio = hevcConfig.pixelWidthHeightRatio;
         }
         codecs = hevcConfig.codecs;
+        colorSpace = hevcConfig.colorSpace;
+        colorRange = hevcConfig.colorRange;
+        colorTransfer = hevcConfig.colorTransfer;
       } else if (childAtomType == Atom.TYPE_dvcC || childAtomType == Atom.TYPE_dvvC) {
         @Nullable DolbyVisionConfig dolbyVisionConfig = DolbyVisionConfig.parse(parent);
         if (dolbyVisionConfig != null) {
@@ -1173,6 +1176,16 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
       } else if (childAtomType == Atom.TYPE_vpcC) {
         ExtractorUtil.checkContainerInput(mimeType == null, /* message= */ null);
         mimeType = (atomType == Atom.TYPE_vp08) ? MimeTypes.VIDEO_VP8 : MimeTypes.VIDEO_VP9;
+        parent.setPosition(childStartPosition + Atom.FULL_HEADER_SIZE);
+        // See vpcC atom syntax: https://www.webmproject.org/vp9/mp4/#syntax_1
+        parent.skipBytes(2); // profile(8), level(8)
+        boolean fullRangeFlag = (parent.readUnsignedByte() & 1) != 0;
+        int colorPrimaries = parent.readUnsignedByte();
+        int transferCharacteristics = parent.readUnsignedByte();
+        colorSpace = ColorInfo.isoColorPrimariesToColorSpace(colorPrimaries);
+        colorRange = fullRangeFlag ? C.COLOR_RANGE_FULL : C.COLOR_RANGE_LIMITED;
+        colorTransfer =
+            ColorInfo.isoTransferCharacteristicsToColorTransfer(transferCharacteristics);
       } else if (childAtomType == Atom.TYPE_av1C) {
         ExtractorUtil.checkContainerInput(mimeType == null, /* message= */ null);
         mimeType = MimeTypes.VIDEO_AV1;
@@ -1252,6 +1265,12 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
           }
         }
       } else if (childAtomType == Atom.TYPE_colr) {
+        // Only modify these values if they have not been previously established by the bitstream.
+        // If 'Atom.TYPE_hvcC' atom or 'Atom.TYPE_vpcC' is available, they will take precedence and
+        // overwrite any existing values.
+        if (colorSpace == Format.NO_VALUE
+            && colorRange == Format.NO_VALUE
+            && colorTransfer == Format.NO_VALUE) {
           int colorType = parent.readInt();
           if (colorType == TYPE_nclx || colorType == TYPE_nclc) {
             // For more info on syntax, see Section 8.5.2.2 in ISO/IEC 14496-12:2012(E) and
@@ -1274,6 +1293,7 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
             Log.w(TAG, "Unsupported color type: " + Atom.getAtomTypeString(colorType));
           }
         }
+      }
       childPosition += childAtomSize;
     }
 
@@ -1560,7 +1580,7 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
         // because these streams can carry simultaneously multiple representations of the same
         // audio. Use stereo by default.
         channelCount = 2;
-      } else if (childAtomType == Atom.TYPE_ddts) {
+      } else if (childAtomType == Atom.TYPE_ddts || childAtomType == Atom.TYPE_udts) {
         out.format =
             new Format.Builder()
                 .setId(trackId)

libraries/extractor/src/test/java/androidx/media3/extractor/NalUnitUtilTest.java

@@ -194,6 +194,9 @@ public final class NalUnitUtilTest {
     assertThat(spsData.pixelWidthHeightRatio).isEqualTo(1);
     assertThat(spsData.seqParameterSetId).isEqualTo(0);
     assertThat(spsData.width).isEqualTo(3840);
+    assertThat(spsData.colorSpace).isEqualTo(6);
+    assertThat(spsData.colorRange).isEqualTo(2);
+    assertThat(spsData.colorTransfer).isEqualTo(6);
   }
 
   private static byte[] buildTestData() {

libraries/session/build.gradle

@@ -43,6 +43,8 @@ dependencies {
     androidTestImplementation 'androidx.multidex:multidex:' + androidxMultidexVersion
     androidTestImplementation 'androidx.test:runner:' + androidxTestRunnerVersion
     testImplementation project(modulePrefix + 'test-utils')
+    testImplementation project(modulePrefix + 'test-utils-robolectric')
+    testImplementation project(modulePrefix + 'lib-exoplayer')
     testImplementation 'org.robolectric:robolectric:' + robolectricVersion
 }
 

libraries/session/src/main/java/androidx/media3/session/ConnectionRequest.java

@@ -89,8 +89,8 @@ import androidx.media3.common.util.Util;
         int controllerInterfaceVersion =
             bundle.getInt(FIELD_CONTROLLER_INTERFACE_VERSION, /* defaultValue= */ 0);
         String packageName = checkNotNull(bundle.getString(FIELD_PACKAGE_NAME));
-        int pid = bundle.getInt(FIELD_PID, /* defaultValue= */ 0);
+        checkArgument(bundle.containsKey(FIELD_PID));
-        checkArgument(pid != 0);
+        int pid = bundle.getInt(FIELD_PID);
         @Nullable Bundle connectionHints = bundle.getBundle(FIELD_CONNECTION_HINTS);
         return new ConnectionRequest(
             libraryVersion,

libraries/session/src/main/java/androidx/media3/session/DefaultMediaNotificationProvider.java

@@ -33,8 +33,6 @@ import android.app.NotificationManager;
 import android.content.Context;
 import android.graphics.Bitmap;
 import android.os.Bundle;
-import android.os.Handler;
-import android.os.Looper;
 import androidx.annotation.DoNotInline;
 import androidx.annotation.DrawableRes;
 import androidx.annotation.Nullable;
@@ -245,7 +243,6 @@ public class DefaultMediaNotificationProvider implements MediaNotification.Provi
   private final String channelId;
   @StringRes private final int channelNameResourceId;
   private final NotificationManager notificationManager;
-  private final Handler mainHandler;
 
   private @MonotonicNonNull OnBitmapLoadedFutureCallback pendingOnBitmapLoadedFutureCallback;
   @DrawableRes private int smallIconResourceId;
@@ -278,7 +275,6 @@ public class DefaultMediaNotificationProvider implements MediaNotification.Provi
     notificationManager =
         checkStateNotNull(
             (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE));
-    mainHandler = new Handler(Looper.getMainLooper());
     smallIconResourceId = R.drawable.media3_notification_small_icon;
   }
 
@@ -346,7 +342,7 @@ public class DefaultMediaNotificationProvider implements MediaNotification.Provi
               pendingOnBitmapLoadedFutureCallback,
               // This callback must be executed on the next looper iteration, after this method has
               // returned a media notification.
-              mainHandler::post);
+              mediaSession.getImpl().getApplicationHandler()::post);
         }
       }
     }

libraries/session/src/main/java/androidx/media3/session/MediaControllerImplLegacy.java

@@ -1795,7 +1795,7 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
     currentTimeline =
         isQueueChanged
             ? QueueTimeline.create(newLegacyPlayerInfo.queue)
-            : new QueueTimeline((QueueTimeline) oldControllerInfo.playerInfo.timeline);
+            : ((QueueTimeline) oldControllerInfo.playerInfo.timeline).copy();
 
     boolean isMetadataCompatChanged =
         oldLegacyPlayerInfo.mediaMetadataCompat != newLegacyPlayerInfo.mediaMetadataCompat
@@ -1987,8 +1987,6 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
     Integer mediaItemTransitionReason;
     boolean isOldTimelineEmpty = oldControllerInfo.playerInfo.timeline.isEmpty();
     boolean isNewTimelineEmpty = newControllerInfo.playerInfo.timeline.isEmpty();
-    int newCurrentMediaItemIndex =
-        newControllerInfo.playerInfo.sessionPositionInfo.positionInfo.mediaItemIndex;
     if (isOldTimelineEmpty && isNewTimelineEmpty) {
       // Still empty Timelines.
       discontinuityReason = null;
@@ -2000,13 +1998,13 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
     } else {
       MediaItem oldCurrentMediaItem =
           checkStateNotNull(oldControllerInfo.playerInfo.getCurrentMediaItem());
-      int oldCurrentMediaItemIndexInNewTimeline =
+      boolean oldCurrentMediaItemExistsInNewTimeline =
-          ((QueueTimeline) newControllerInfo.playerInfo.timeline).indexOf(oldCurrentMediaItem);
+          ((QueueTimeline) newControllerInfo.playerInfo.timeline).contains(oldCurrentMediaItem);
-      if (oldCurrentMediaItemIndexInNewTimeline == C.INDEX_UNSET) {
+      if (!oldCurrentMediaItemExistsInNewTimeline) {
         // Old current item is removed.
         discontinuityReason = Player.DISCONTINUITY_REASON_REMOVE;
         mediaItemTransitionReason = Player.MEDIA_ITEM_TRANSITION_REASON_PLAYLIST_CHANGED;
-      } else if (oldCurrentMediaItemIndexInNewTimeline == newCurrentMediaItemIndex) {
+      } else if (oldCurrentMediaItem.equals(newControllerInfo.playerInfo.getCurrentMediaItem())) {
         // Current item is the same.
         long oldCurrentPosition =
             MediaUtils.convertToCurrentPositionMs(

libraries/session/src/main/java/androidx/media3/session/MediaNotification.java

@@ -35,6 +35,10 @@ public final class MediaNotification {
   /**
    * Creates {@linkplain NotificationCompat.Action actions} and {@linkplain PendingIntent pending
    * intents} for notifications.
+   *
+   * <p>All methods will be called on the {@link Player#getApplicationLooper() application thread}
+   * of the {@link Player} associated with the {@link MediaSession} the notification is provided
+   * for.
    */
   @UnstableApi
   public interface ActionFactory {
@@ -109,10 +113,20 @@ public final class MediaNotification {
    *
    * <p>The provider is required to create a {@linkplain androidx.core.app.NotificationChannelCompat
    * notification channel}, which is required to show notification for {@code SDK_INT >= 26}.
+   *
+   * <p>All methods will be called on the {@link Player#getApplicationLooper() application thread}
+   * of the {@link Player} associated with the {@link MediaSession} the notification is provided
+   * for.
    */
   @UnstableApi
   public interface Provider {
-    /** Receives updates for a notification. */
+    /**
+     * Receives updates for a notification.
+     *
+     * <p>All methods will be called on the {@link Player#getApplicationLooper() application thread}
+     * of the {@link Player} associated with the {@link MediaSession} the notification is provided
+     * for.
+     */
     interface Callback {
       /**
        * Called when a {@link MediaNotification} is changed.

libraries/session/src/main/java/androidx/media3/session/MediaNotificationManager.java

@@ -50,6 +50,8 @@ import java.util.concurrent.TimeoutException;
 /**
  * Manages media notifications for a {@link MediaSessionService} and sets the service as
  * foreground/background according to the player state.
+ *
+ * <p>All methods must be called on the main thread.
  */
 /* package */ final class MediaNotificationManager {
 
@@ -96,11 +98,12 @@ import java.util.concurrent.TimeoutException;
             .setListener(listener)
             .setApplicationLooper(Looper.getMainLooper())
             .buildAsync();
+    controllerMap.put(session, controllerFuture);
     controllerFuture.addListener(
         () -> {
           try {
             MediaController controller = controllerFuture.get(/* time= */ 0, TimeUnit.MILLISECONDS);
-            listener.onConnected();
+            listener.onConnected(shouldShowNotification(session));
             controller.addListener(listener);
           } catch (CancellationException
               | ExecutionException
@@ -111,7 +114,6 @@ import java.util.concurrent.TimeoutException;
           }
         },
         mainExecutor);
-    controllerMap.put(session, controllerFuture);
   }
 
   public void removeSession(MediaSession session) {
@@ -123,46 +125,19 @@ import java.util.concurrent.TimeoutException;
   }
 
   public void onCustomAction(MediaSession session, String action, Bundle extras) {
-    @Nullable ListenableFuture<MediaController> controllerFuture = controllerMap.get(session);
+    @Nullable MediaController mediaController = getConnectedControllerForSession(session);
-    if (controllerFuture == null) {
+    if (mediaController == null) {
       return;
     }
-    try {
+    // Let the notification provider handle the command first before forwarding it directly.
-      MediaController mediaController = checkStateNotNull(Futures.getDone(controllerFuture));
+    Util.postOrRun(
+        new Handler(session.getPlayer().getApplicationLooper()),
+        () -> {
           if (!mediaNotificationProvider.handleCustomCommand(session, action, extras)) {
-        @Nullable SessionCommand customCommand = null;
+            mainExecutor.execute(
-        for (SessionCommand command : mediaController.getAvailableSessionCommands().commands) {
+                () -> sendCustomCommandIfCommandIsAvailable(mediaController, action));
-          if (command.commandCode == SessionCommand.COMMAND_CODE_CUSTOM
-              && command.customAction.equals(action)) {
-            customCommand = command;
-            break;
-          }
-        }
-        if (customCommand != null
-            && mediaController.getAvailableSessionCommands().contains(customCommand)) {
-          ListenableFuture<SessionResult> future =
-              mediaController.sendCustomCommand(customCommand, Bundle.EMPTY);
-          Futures.addCallback(
-              future,
-              new FutureCallback<SessionResult>() {
-                @Override
-                public void onSuccess(SessionResult result) {
-                  // Do nothing.
-                }
-
-                @Override
-                public void onFailure(Throwable t) {
-                  Log.w(
-                      TAG, "custom command " + action + " produced an error: " + t.getMessage(), t);
-                }
-              },
-              MoreExecutors.directExecutor());
-        }
-      }
-    } catch (ExecutionException e) {
-      // We should never reach this.
-      throw new IllegalStateException(e);
           }
+        });
   }
 
   /**
@@ -178,27 +153,42 @@ import java.util.concurrent.TimeoutException;
     }
 
     int notificationSequence = ++totalNotificationCount;
+    ImmutableList<CommandButton> customLayout = checkStateNotNull(customLayoutMap.get(session));
     MediaNotification.Provider.Callback callback =
         notification ->
             mainExecutor.execute(
                 () -> onNotificationUpdated(notificationSequence, session, notification));
-
+    Util.postOrRun(
+        new Handler(session.getPlayer().getApplicationLooper()),
+        () -> {
           MediaNotification mediaNotification =
               this.mediaNotificationProvider.createNotification(
-            session, checkStateNotNull(customLayoutMap.get(session)), actionFactory, callback);
+                  session, customLayout, actionFactory, callback);
-    updateNotificationInternal(session, mediaNotification, startInForegroundRequired);
+          mainExecutor.execute(
+              () ->
+                  updateNotificationInternal(
+                      session, mediaNotification, startInForegroundRequired));
+        });
   }
 
   public boolean isStartedInForeground() {
     return startedInForeground;
   }
 
+  /* package */ boolean shouldRunInForeground(
+      MediaSession session, boolean startInForegroundWhenPaused) {
+    @Nullable MediaController controller = getConnectedControllerForSession(session);
+    return controller != null
+        && (controller.getPlayWhenReady() || startInForegroundWhenPaused)
+        && (controller.getPlaybackState() == Player.STATE_READY
+            || controller.getPlaybackState() == Player.STATE_BUFFERING);
+  }
+
   private void onNotificationUpdated(
       int notificationSequence, MediaSession session, MediaNotification mediaNotification) {
     if (notificationSequence == totalNotificationCount) {
       boolean startInForegroundRequired =
-          MediaSessionService.shouldRunInForeground(
+          shouldRunInForeground(session, /* startInForegroundWhenPaused= */ false);
-              session, /* startInForegroundWhenPaused= */ false);
       updateNotificationInternal(session, mediaNotification, startInForegroundRequired);
     }
   }
@@ -236,8 +226,7 @@ import java.util.concurrent.TimeoutException;
   private void maybeStopForegroundService(boolean removeNotifications) {
     List<MediaSession> sessions = mediaSessionService.getSessions();
     for (int i = 0; i < sessions.size(); i++) {
-      if (MediaSessionService.shouldRunInForeground(
+      if (shouldRunInForeground(sessions.get(i), /* startInForegroundWhenPaused= */ false)) {
-          sessions.get(i), /* startInForegroundWhenPaused= */ false)) {
         return;
       }
     }
@@ -251,9 +240,56 @@ import java.util.concurrent.TimeoutException;
     }
   }
 
-  private static boolean shouldShowNotification(MediaSession session) {
+  private boolean shouldShowNotification(MediaSession session) {
-    Player player = session.getPlayer();
+    MediaController controller = getConnectedControllerForSession(session);
-    return !player.getCurrentTimeline().isEmpty() && player.getPlaybackState() != Player.STATE_IDLE;
+    return controller != null
+        && !controller.getCurrentTimeline().isEmpty()
+        && controller.getPlaybackState() != Player.STATE_IDLE;
+  }
+
+  @Nullable
+  private MediaController getConnectedControllerForSession(MediaSession session) {
+    @Nullable ListenableFuture<MediaController> controllerFuture = controllerMap.get(session);
+    if (controllerFuture == null) {
+      return null;
+    }
+    try {
+      return Futures.getDone(controllerFuture);
+    } catch (ExecutionException exception) {
+      // We should never reach this.
+      throw new IllegalStateException(exception);
+    }
+  }
+
+  private void sendCustomCommandIfCommandIsAvailable(
+      MediaController mediaController, String action) {
+    @Nullable SessionCommand customCommand = null;
+    for (SessionCommand command : mediaController.getAvailableSessionCommands().commands) {
+      if (command.commandCode == SessionCommand.COMMAND_CODE_CUSTOM
+          && command.customAction.equals(action)) {
+        customCommand = command;
+        break;
+      }
+    }
+    if (customCommand != null
+        && mediaController.getAvailableSessionCommands().contains(customCommand)) {
+      ListenableFuture<SessionResult> future =
+          mediaController.sendCustomCommand(customCommand, Bundle.EMPTY);
+      Futures.addCallback(
+          future,
+          new FutureCallback<SessionResult>() {
+            @Override
+            public void onSuccess(SessionResult result) {
+              // Do nothing.
+            }
+
+            @Override
+            public void onFailure(Throwable t) {
+              Log.w(TAG, "custom command " + action + " produced an error: " + t.getMessage(), t);
+            }
+          },
+          MoreExecutors.directExecutor());
+    }
   }
 
   private static final class MediaControllerListener
@@ -271,8 +307,8 @@ import java.util.concurrent.TimeoutException;
       this.customLayoutMap = customLayoutMap;
     }
 
-    public void onConnected() {
+    public void onConnected(boolean shouldShowNotification) {
-      if (shouldShowNotification(session)) {
+      if (shouldShowNotification) {
         mediaSessionService.onUpdateNotificationInternal(
             session, /* startInForegroundWhenPaused= */ false);
       }

libraries/session/src/main/java/androidx/media3/session/MediaSession.java

@@ -701,6 +701,9 @@ public class MediaSession {
    * </tr>
    * </table>
    *
+   * <p>Interoperability: This call has no effect when called for a {@linkplain
+   * ControllerInfo#LEGACY_CONTROLLER_VERSION legacy controller}.
+   *
    * @param controller The controller to specify layout.
    * @param layout The ordered list of {@link CommandButton}.
    */
@@ -793,6 +796,9 @@ public class MediaSession {
    *
    * <p>This is a synchronous call and doesn't wait for results from the controller.
    *
+   * <p>Interoperability: This call has no effect when called for a {@linkplain
+   * ControllerInfo#LEGACY_CONTROLLER_VERSION legacy controller}.
+   *
    * @param controller The controller to send the extras to.
    * @param sessionExtras The session extras.
    */
@@ -816,6 +822,9 @@ public class MediaSession {
    *
    * <p>A command is not accepted if it is not a custom command.
    *
+   * <p>Interoperability: This call has no effect when called for a {@linkplain
+   * ControllerInfo#LEGACY_CONTROLLER_VERSION legacy controller}.
+   *
    * @param controller The controller to send the custom command to.
    * @param command A custom command.
    * @param args A {@link Bundle} for additional arguments. May be empty.
@@ -890,12 +899,20 @@ public class MediaSession {
     impl.setSessionPositionUpdateDelayMsOnHandler(updateDelayMs);
   }
 
-  /** Sets the {@linkplain Listener listener}. */
+  /**
+   * Sets the {@linkplain Listener listener}.
+   *
+   * <p>This method must be called on the main thread.
+   */
   /* package */ void setListener(Listener listener) {
     impl.setMediaSessionListener(listener);
   }
 
-  /** Clears the {@linkplain Listener listener}. */
+  /**
+   * Clears the {@linkplain Listener listener}.
+   *
+   * <p>This method must be called on the main thread.
+   */
   /* package */ void clearListener() {
     impl.clearMediaSessionListener();
   }
@@ -1426,7 +1443,11 @@ public class MediaSession {
     default void onRenderedFirstFrame(int seq) throws RemoteException {}
   }
 
-  /** Listener for media session events */
+  /**
+   * Listener for media session events.
+   *
+   * <p>All methods must be called on the main thread.
+   */
   /* package */ interface Listener {
 
     /**

libraries/session/src/main/java/androidx/media3/session/MediaSessionImpl.java

@@ -15,21 +15,17 @@
  */
 package androidx.media3.session;
 
-import static androidx.media3.common.Player.COMMAND_GET_TRACKS;
 import static androidx.media3.common.util.Assertions.checkNotNull;
 import static androidx.media3.common.util.Assertions.checkStateNotNull;
-import static androidx.media3.common.util.Util.castNonNull;
 import static androidx.media3.common.util.Util.postOrRun;
 import static androidx.media3.session.SessionResult.RESULT_ERROR_SESSION_DISCONNECTED;
 import static androidx.media3.session.SessionResult.RESULT_ERROR_UNKNOWN;
 import static androidx.media3.session.SessionResult.RESULT_INFO_SKIPPED;
 
 import android.app.PendingIntent;
-import android.content.BroadcastReceiver;
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
-import android.content.IntentFilter;
 import android.content.pm.PackageManager;
 import android.content.pm.ResolveInfo;
 import android.net.Uri;
@@ -43,7 +39,6 @@ import android.os.Process;
 import android.os.RemoteException;
 import android.os.SystemClock;
 import android.support.v4.media.session.MediaSessionCompat;
-import android.view.KeyEvent;
 import androidx.annotation.FloatRange;
 import androidx.annotation.GuardedBy;
 import androidx.annotation.Nullable;
@@ -66,7 +61,6 @@ import androidx.media3.common.Tracks;
 import androidx.media3.common.VideoSize;
 import androidx.media3.common.text.CueGroup;
 import androidx.media3.common.util.Log;
-import androidx.media3.common.util.Util;
 import androidx.media3.session.MediaSession.ControllerCb;
 import androidx.media3.session.MediaSession.ControllerInfo;
 import androidx.media3.session.MediaSession.MediaItemsWithStartPosition;
@@ -74,9 +68,11 @@ import androidx.media3.session.SequencedFutureManager.SequencedFuture;
 import com.google.common.collect.ImmutableList;
 import com.google.common.util.concurrent.Futures;
 import com.google.common.util.concurrent.ListenableFuture;
+import com.google.common.util.concurrent.SettableFuture;
 import java.lang.ref.WeakReference;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.concurrent.ExecutionException;
 import org.checkerframework.checker.initialization.qual.Initialized;
 
 /* package */ class MediaSessionImpl {
@@ -115,13 +111,13 @@ import org.checkerframework.checker.initialization.qual.Initialized;
   private final SessionToken sessionToken;
   private final MediaSession instance;
   @Nullable private final PendingIntent sessionActivity;
-  private final PendingIntent mediaButtonIntent;
-  @Nullable private final BroadcastReceiver broadcastReceiver;
   private final Handler applicationHandler;
   private final BitmapLoader bitmapLoader;
   private final Runnable periodicSessionPositionInfoUpdateRunnable;
+  private final Handler mainHandler;
 
   @Nullable private PlayerListener playerListener;
+
   @Nullable private MediaSession.Listener mediaSessionListener;
 
   private PlayerInfo playerInfo;
@@ -156,6 +152,7 @@ import org.checkerframework.checker.initialization.qual.Initialized;
     sessionStub = new MediaSessionStub(thisRef);
     this.sessionActivity = sessionActivity;
 
+    mainHandler = new Handler(Looper.getMainLooper());
     applicationHandler = new Handler(player.getApplicationLooper());
     this.callback = callback;
     this.bitmapLoader = bitmapLoader;
@@ -189,52 +186,21 @@ import org.checkerframework.checker.initialization.qual.Initialized;
             sessionStub,
             tokenExtras);
 
-    @Nullable ComponentName mbrComponent;
     synchronized (STATIC_LOCK) {
       if (!componentNamesInitialized) {
-        serviceComponentName =
+        MediaSessionImpl.serviceComponentName =
             getServiceComponentByAction(context, MediaLibraryService.SERVICE_INTERFACE);
-        if (serviceComponentName == null) {
+        if (MediaSessionImpl.serviceComponentName == null) {
-          serviceComponentName =
+          MediaSessionImpl.serviceComponentName =
               getServiceComponentByAction(context, MediaSessionService.SERVICE_INTERFACE);
         }
         componentNamesInitialized = true;
       }
-      mbrComponent = serviceComponentName;
-    }
-    int pendingIntentFlagMutable = Util.SDK_INT >= 31 ? PendingIntent.FLAG_MUTABLE : 0;
-    if (mbrComponent == null) {
-      // No service to revive playback after it's dead.
-      // Create a PendingIntent that points to the runtime broadcast receiver.
-      Intent intent = new Intent(Intent.ACTION_MEDIA_BUTTON, sessionUri);
-      intent.setPackage(context.getPackageName());
-      mediaButtonIntent =
-          PendingIntent.getBroadcast(
-              context, /* requestCode= */ 0, intent, pendingIntentFlagMutable);
-
-      // Creates a fake ComponentName for MediaSessionCompat in pre-L.
-      mbrComponent = new ComponentName(context, context.getClass());
-
-      // Create and register a BroadcastReceiver for receiving PendingIntent.
-      broadcastReceiver = new MediaButtonReceiver();
-      IntentFilter filter = new IntentFilter(Intent.ACTION_MEDIA_BUTTON);
-      filter.addDataScheme(castNonNull(sessionUri.getScheme()));
-      Util.registerReceiverNotExported(context, broadcastReceiver, filter);
-    } else {
-      // Has MediaSessionService to revive playback after it's dead.
-      Intent intent = new Intent(Intent.ACTION_MEDIA_BUTTON, sessionUri);
-      intent.setComponent(mbrComponent);
-      if (Util.SDK_INT >= 26) {
-        mediaButtonIntent =
-            PendingIntent.getForegroundService(context, 0, intent, pendingIntentFlagMutable);
-      } else {
-        mediaButtonIntent = PendingIntent.getService(context, 0, intent, pendingIntentFlagMutable);
-      }
-      broadcastReceiver = null;
     }
 
     sessionLegacyStub =
-        new MediaSessionLegacyStub(thisRef, mbrComponent, mediaButtonIntent, applicationHandler);
+        new MediaSessionLegacyStub(
+            /* session= */ thisRef, sessionUri, serviceComponentName, applicationHandler);
 
     PlayerWrapper playerWrapper = new PlayerWrapper(player);
     this.playerWrapper = playerWrapper;
@@ -278,8 +244,7 @@ import org.checkerframework.checker.initialization.qual.Initialized;
     }
 
     playerInfo = newPlayerWrapper.createPlayerInfoForBundling();
-    onPlayerInfoChangedHandler.sendPlayerInfoChangedMessage(
+    handleAvailablePlayerCommandsChanged(newPlayerWrapper.getAvailableCommands());
-        /* excludeTimeline= */ false, /* excludeTracks= */ false);
   }
 
   public void release() {
@@ -305,10 +270,6 @@ import org.checkerframework.checker.initialization.qual.Initialized;
       Log.w(TAG, "Exception thrown while closing", e);
     }
     sessionLegacyStub.release();
-    mediaButtonIntent.cancel();
-    if (broadcastReceiver != null) {
-      context.unregisterReceiver(broadcastReceiver);
-    }
     sessionStub.release();
   }
 
@@ -395,7 +356,7 @@ import org.checkerframework.checker.initialization.qual.Initialized;
 
   private void dispatchOnPlayerInfoChanged(
       PlayerInfo playerInfo, boolean excludeTimeline, boolean excludeTracks) {
-
+    playerInfo = sessionStub.generateAndCacheUniqueTrackGroupIds(playerInfo);
     List<ControllerInfo> controllers =
         sessionStub.getConnectedControllersManager().getConnectedControllers();
     for (int i = 0; i < controllers.size(); i++) {
@@ -589,12 +550,25 @@ import org.checkerframework.checker.initialization.qual.Initialized;
   }
 
   /* package */ void onNotificationRefreshRequired() {
+    postOrRun(
+        mainHandler,
+        () -> {
           if (this.mediaSessionListener != null) {
             this.mediaSessionListener.onNotificationRefreshRequired(instance);
           }
+        });
   }
 
   /* package */ boolean onPlayRequested() {
+    if (Looper.myLooper() != Looper.getMainLooper()) {
+      SettableFuture<Boolean> playRequested = SettableFuture.create();
+      mainHandler.post(() -> playRequested.set(onPlayRequested()));
+      try {
+        return playRequested.get();
+      } catch (InterruptedException | ExecutionException e) {
+        throw new IllegalStateException(e);
+      }
+    }
     if (this.mediaSessionListener != null) {
       return this.mediaSessionListener.onPlayRequested(instance);
     }
@@ -772,6 +746,20 @@ import org.checkerframework.checker.initialization.qual.Initialized;
     }
   }
 
+  private void handleAvailablePlayerCommandsChanged(Player.Commands availableCommands) {
+    // Update PlayerInfo and do not force exclude elements in case they need to be updated because
+    // an available command has been removed.
+    onPlayerInfoChangedHandler.sendPlayerInfoChangedMessage(
+        /* excludeTimeline= */ false, /* excludeTracks= */ false);
+    dispatchRemoteControllerTaskWithoutReturn(
+        (callback, seq) -> callback.onAvailableCommandsChangedFromPlayer(seq, availableCommands));
+
+    // Forcefully update playback info to update VolumeProviderCompat in case
+    // COMMAND_ADJUST_DEVICE_VOLUME or COMMAND_SET_DEVICE_VOLUME value has changed.
+    dispatchRemoteControllerTaskToLegacyStub(
+        (callback, seq) -> callback.onDeviceInfoChanged(seq, playerInfo.deviceInfo));
+  }
+
   /* @FunctionalInterface */
   interface RemoteControllerTask {
 
@@ -1182,16 +1170,7 @@ import org.checkerframework.checker.initialization.qual.Initialized;
       if (player == null) {
         return;
       }
-      boolean excludeTracks = !availableCommands.contains(COMMAND_GET_TRACKS);
+      session.handleAvailablePlayerCommandsChanged(availableCommands);
-      session.onPlayerInfoChangedHandler.sendPlayerInfoChangedMessage(
-          /* excludeTimeline= */ false, excludeTracks);
-      session.dispatchRemoteControllerTaskWithoutReturn(
-          (callback, seq) -> callback.onAvailableCommandsChangedFromPlayer(seq, availableCommands));
-
-      // Forcefully update playback info to update VolumeProviderCompat in case
-      // COMMAND_ADJUST_DEVICE_VOLUME or COMMAND_SET_DEVICE_VOLUME value has changed.
-      session.dispatchRemoteControllerTaskToLegacyStub(
-          (callback, seq) -> callback.onDeviceInfoChanged(seq, session.playerInfo.deviceInfo));
     }
 
     @Override
@@ -1281,26 +1260,6 @@ import org.checkerframework.checker.initialization.qual.Initialized;
     }
   }
 
-  // TODO(b/193193462): Replace this with androidx.media.session.MediaButtonReceiver
-  private final class MediaButtonReceiver extends BroadcastReceiver {
-
-    @Override
-    public void onReceive(Context context, Intent intent) {
-      if (!Intent.ACTION_MEDIA_BUTTON.equals(intent.getAction())) {
-        return;
-      }
-      Uri sessionUri = intent.getData();
-      if (!Util.areEqual(sessionUri, MediaSessionImpl.this.sessionUri)) {
-        return;
-      }
-      KeyEvent keyEvent = (KeyEvent) intent.getParcelableExtra(Intent.EXTRA_KEY_EVENT);
-      if (keyEvent == null) {
-        return;
-      }
-      getSessionCompat().getController().dispatchMediaButtonEvent(keyEvent);
-    }
-  }
-
   private class PlayerInfoChangedHandler extends Handler {
 
     private static final int MSG_PLAYER_INFO_CHANGED = 1;

libraries/session/src/main/java/androidx/media3/session/MediaSessionLegacyStub.java

@@ -35,6 +35,7 @@ import static androidx.media3.common.Player.STATE_ENDED;
 import static androidx.media3.common.Player.STATE_IDLE;
 import static androidx.media3.common.util.Assertions.checkNotNull;
 import static androidx.media3.common.util.Assertions.checkStateNotNull;
+import static androidx.media3.common.util.Util.castNonNull;
 import static androidx.media3.common.util.Util.postOrRun;
 import static androidx.media3.session.MediaUtils.TRANSACTION_SIZE_LIMIT_IN_BYTES;
 import static androidx.media3.session.SessionCommand.COMMAND_CODE_CUSTOM;
@@ -43,9 +44,13 @@ import static androidx.media3.session.SessionResult.RESULT_INFO_SKIPPED;
 import static androidx.media3.session.SessionResult.RESULT_SUCCESS;
 
 import android.app.PendingIntent;
+import android.content.BroadcastReceiver;
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
+import android.content.IntentFilter;
+import android.content.pm.PackageManager;
+import android.content.pm.ResolveInfo;
 import android.graphics.Bitmap;
 import android.net.Uri;
 import android.os.Bundle;
@@ -107,6 +112,8 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
 
   private static final String TAG = "MediaSessionLegacyStub";
 
+  private static final int PENDING_INTENT_FLAG_MUTABLE =
+      Util.SDK_INT >= 31 ? PendingIntent.FLAG_MUTABLE : 0;
   private static final String DEFAULT_MEDIA_SESSION_TAG_PREFIX = "androidx.media3.session.id";
   private static final String DEFAULT_MEDIA_SESSION_TAG_DELIM = ".";
 
@@ -122,6 +129,8 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
   private final MediaPlayPauseKeyHandler mediaPlayPauseKeyHandler;
   private final MediaSessionCompat sessionCompat;
   private final String appPackageName;
+  @Nullable private final MediaButtonReceiver runtimeBroadcastReceiver;
+  private final boolean canResumePlaybackOnStart;
   @Nullable private VolumeProviderCompat volumeProviderCompat;
 
   private volatile long connectionTimeoutMs;
@@ -130,8 +139,8 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
 
   public MediaSessionLegacyStub(
       MediaSessionImpl session,
-      ComponentName mbrComponent,
+      Uri sessionUri,
-      PendingIntent mediaButtonIntent,
+      @Nullable ComponentName serviceComponentName,
       Handler handler) {
     sessionImpl = session;
     Context context = sessionImpl.getContext();
@@ -145,6 +154,44 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
     connectedControllersManager = new ConnectedControllersManager<>(session);
     connectionTimeoutMs = DEFAULT_CONNECTION_TIMEOUT_MS;
 
+    // Select a media button receiver component.
+    ComponentName receiverComponentName = queryPackageManagerForMediaButtonReceiver(context);
+    // Assume an app that intentionally puts a `MediaButtonReceiver` into the manifest has
+    // implemented some kind of resumption of the last recently played media item.
+    canResumePlaybackOnStart = receiverComponentName != null;
+    if (receiverComponentName == null) {
+      receiverComponentName = serviceComponentName;
+    }
+    Intent intent = new Intent(Intent.ACTION_MEDIA_BUTTON, sessionUri);
+    PendingIntent mediaButtonIntent;
+    if (receiverComponentName == null) {
+      // Neither a media button receiver from the app manifest nor a service available that could
+      // handle media button events. Create a runtime receiver and a pending intent for it.
+      runtimeBroadcastReceiver = new MediaButtonReceiver();
+      IntentFilter filter = new IntentFilter(Intent.ACTION_MEDIA_BUTTON);
+      filter.addDataScheme(castNonNull(sessionUri.getScheme()));
+      Util.registerReceiverNotExported(context, runtimeBroadcastReceiver, filter);
+      // Create a pending intent to be broadcast to the receiver.
+      intent.setPackage(context.getPackageName());
+      mediaButtonIntent =
+          PendingIntent.getBroadcast(
+              context, /* requestCode= */ 0, intent, PENDING_INTENT_FLAG_MUTABLE);
+      // Creates a fake ComponentName for MediaSessionCompat in pre-L.
+      receiverComponentName = new ComponentName(context, context.getClass());
+    } else {
+      intent.setComponent(receiverComponentName);
+      mediaButtonIntent =
+          Objects.equals(serviceComponentName, receiverComponentName)
+              ? (Util.SDK_INT >= 26
+                  ? PendingIntent.getForegroundService(
+                      context, /* requestCode= */ 0, intent, PENDING_INTENT_FLAG_MUTABLE)
+                  : PendingIntent.getService(
+                      context, /* requestCode= */ 0, intent, PENDING_INTENT_FLAG_MUTABLE))
+              : PendingIntent.getBroadcast(
+                  context, /* requestCode= */ 0, intent, PENDING_INTENT_FLAG_MUTABLE);
+      runtimeBroadcastReceiver = null;
+    }
+
     String sessionCompatId =
         TextUtils.join(
             DEFAULT_MEDIA_SESSION_TAG_DELIM,
@@ -153,7 +200,7 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
         new MediaSessionCompat(
             context,
             sessionCompatId,
-            mbrComponent,
+            receiverComponentName,
             mediaButtonIntent,
             session.getToken().getExtras());
 
@@ -168,12 +215,38 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
     sessionCompat.setCallback(thisRef, handler);
   }
 
+  @Nullable
+  private static ComponentName queryPackageManagerForMediaButtonReceiver(Context context) {
+    PackageManager pm = context.getPackageManager();
+    Intent queryIntent = new Intent(Intent.ACTION_MEDIA_BUTTON);
+    queryIntent.setPackage(context.getPackageName());
+    List<ResolveInfo> resolveInfos = pm.queryBroadcastReceivers(queryIntent, /* flags= */ 0);
+    if (resolveInfos.size() == 1) {
+      ResolveInfo resolveInfo = resolveInfos.get(0);
+      return new ComponentName(resolveInfo.activityInfo.packageName, resolveInfo.activityInfo.name);
+    } else if (resolveInfos.isEmpty()) {
+      return null;
+    } else {
+      throw new IllegalStateException(
+          "Expected 1 broadcast receiver that handles "
+              + Intent.ACTION_MEDIA_BUTTON
+              + ", found "
+              + resolveInfos.size());
+    }
+  }
+
   /** Starts to receive commands. */
   public void start() {
     sessionCompat.setActive(true);
   }
 
   public void release() {
+    if (!canResumePlaybackOnStart) {
+      setMediaButtonReceiver(sessionCompat, /* mediaButtonReceiverIntent= */ null);
+    }
+    if (runtimeBroadcastReceiver != null) {
+      sessionImpl.getContext().unregisterReceiver(runtimeBroadcastReceiver);
+    }
     sessionCompat.release();
   }
 
@@ -832,6 +905,12 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
     sessionCompat.setMetadata(metadataCompat);
   }
 
+  @SuppressWarnings("nullness:argument") // MediaSessionCompat didn't annotate @Nullable.
+  private static void setMediaButtonReceiver(
+      MediaSessionCompat sessionCompat, @Nullable PendingIntent mediaButtonReceiverIntent) {
+    sessionCompat.setMediaButtonReceiver(mediaButtonReceiverIntent);
+  }
+
   @SuppressWarnings("nullness:argument") // MediaSessionCompat didn't annotate @Nullable.
   private static void setQueue(MediaSessionCompat sessionCompat, @Nullable List<QueueItem> queue) {
     sessionCompat.setQueue(queue);
@@ -987,6 +1066,11 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
       sessionImpl.getSessionCompat().setExtras(sessionExtras);
     }
 
+    @Override
+    public void sendCustomCommand(int seq, SessionCommand command, Bundle args) {
+      sessionImpl.getSessionCompat().sendSessionEvent(command.customAction, args);
+    }
+
     @Override
     public void onPlayWhenReadyChanged(
         int seq, boolean playWhenReady, @Player.PlaybackSuppressionReason int reason)
@@ -1237,11 +1321,6 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
       lastMediaMetadata = newMediaMetadata;
       lastDurationMs = newDurationMs;
 
-      if (currentMediaItem == null) {
-        setMetadata(sessionCompat, /* metadataCompat= */ null);
-        return;
-      }
-
       @Nullable Bitmap artworkBitmap = null;
       ListenableFuture<Bitmap> bitmapFuture =
           sessionImpl.getBitmapLoader().loadBitmapFromMetadata(newMediaMetadata);
@@ -1353,4 +1432,24 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
   private static String getBitmapLoadErrorMessage(Throwable throwable) {
     return "Failed to load bitmap: " + throwable.getMessage();
   }
+
+  // TODO(b/193193462): Replace this with androidx.media.session.MediaButtonReceiver
+  private final class MediaButtonReceiver extends BroadcastReceiver {
+
+    @Override
+    public void onReceive(Context context, Intent intent) {
+      if (!Util.areEqual(intent.getAction(), Intent.ACTION_MEDIA_BUTTON)) {
+        return;
+      }
+      Uri sessionUri = intent.getData();
+      if (!Util.areEqual(sessionUri, sessionUri)) {
+        return;
+      }
+      KeyEvent keyEvent = intent.getParcelableExtra(Intent.EXTRA_KEY_EVENT);
+      if (keyEvent == null) {
+        return;
+      }
+      getSessionCompat().getController().dispatchMediaButtonEvent(keyEvent);
+    }
+  }
 }

libraries/session/src/main/java/androidx/media3/session/MediaSessionService.java

@@ -40,7 +40,6 @@ import androidx.annotation.RequiresApi;
 import androidx.collection.ArrayMap;
 import androidx.media.MediaBrowserServiceCompat;
 import androidx.media.MediaSessionManager;
-import androidx.media3.common.Player;
 import androidx.media3.common.util.Log;
 import androidx.media3.common.util.UnstableApi;
 import androidx.media3.common.util.Util;
@@ -183,7 +182,6 @@ public abstract class MediaSessionService extends Service {
   @Nullable
   private Listener listener;
 
-  @GuardedBy("lock")
   private boolean defaultMethodCalled;
 
   /** Creates a service. */
@@ -198,6 +196,8 @@ public abstract class MediaSessionService extends Service {
    * Called when the service is created.
    *
    * <p>Override this method if you need your own initialization.
+   *
+   * <p>This method will be called on the main thread.
    */
   @CallSuper
   @Override
@@ -234,7 +234,7 @@ public abstract class MediaSessionService extends Service {
    * <p>For those special cases, the values returned by {@link ControllerInfo#getUid()} and {@link
    * ControllerInfo#getConnectionHints()} have no meaning.
    *
-   * <p>This method is always called on the main thread.
+   * <p>This method will be called on the main thread.
    *
    * @param controllerInfo The information of the controller that is trying to connect.
    * @return A {@link MediaSession} for the controller, or {@code null} to reject the connection.
@@ -251,6 +251,8 @@ public abstract class MediaSessionService extends Service {
    * <p>The added session will be removed automatically {@linkplain MediaSession#release() when the
    * session is released}.
    *
+   * <p>This method can be called from any thread.
+   *
    * @param session A session to be added.
    * @see #removeSession(MediaSession)
    * @see #getSessions()
@@ -268,8 +270,12 @@ public abstract class MediaSessionService extends Service {
       // Session has returned for the first time. Register callbacks.
       // TODO(b/191644474): Check whether the session is registered to multiple services.
       MediaNotificationManager notificationManager = getMediaNotificationManager();
-      postOrRun(mainHandler, () -> notificationManager.addSession(session));
+      postOrRun(
+          mainHandler,
+          () -> {
+            notificationManager.addSession(session);
             session.setListener(new MediaSessionListener());
+          });
     }
   }
 
@@ -277,6 +283,8 @@ public abstract class MediaSessionService extends Service {
    * Removes a {@link MediaSession} from this service. This is not necessary for most media apps.
    * See <a href="#MultipleSessions">Supporting Multiple Sessions</a> for details.
    *
+   * <p>This method can be called from any thread.
+   *
    * @param session A session to be removed.
    * @see #addSession(MediaSession)
    * @see #getSessions()
@@ -288,13 +296,19 @@ public abstract class MediaSessionService extends Service {
       sessions.remove(session.getId());
     }
     MediaNotificationManager notificationManager = getMediaNotificationManager();
-    postOrRun(mainHandler, () -> notificationManager.removeSession(session));
+    postOrRun(
+        mainHandler,
+        () -> {
+          notificationManager.removeSession(session);
           session.clearListener();
+        });
   }
 
   /**
    * Returns the list of {@linkplain MediaSession sessions} that you've added to this service via
    * {@link #addSession} or {@link #onGetSession(ControllerInfo)}.
+   *
+   * <p>This method can be called from any thread.
    */
   public final List<MediaSession> getSessions() {
     synchronized (lock) {
@@ -305,6 +319,8 @@ public abstract class MediaSessionService extends Service {
   /**
    * Returns whether {@code session} has been added to this service via {@link #addSession} or
    * {@link #onGetSession(ControllerInfo)}.
+   *
+   * <p>This method can be called from any thread.
    */
   public final boolean isSessionAdded(MediaSession session) {
     synchronized (lock) {
@@ -312,7 +328,11 @@ public abstract class MediaSessionService extends Service {
     }
   }
 
-  /** Sets the {@linkplain Listener listener}. */
+  /**
+   * Sets the {@linkplain Listener listener}.
+   *
+   * <p>This method can be called from any thread.
+   */
   @UnstableApi
   public final void setListener(Listener listener) {
     synchronized (lock) {
@@ -320,7 +340,11 @@ public abstract class MediaSessionService extends Service {
     }
   }
 
-  /** Clears the {@linkplain Listener listener}. */
+  /**
+   * Clears the {@linkplain Listener listener}.
+   *
+   * <p>This method can be called from any thread.
+   */
   @UnstableApi
   public final void clearListener() {
     synchronized (lock) {
@@ -335,6 +359,8 @@ public abstract class MediaSessionService extends Service {
    * controllers}. In this case, the intent will have the action {@link #SERVICE_INTERFACE}.
    * Override this method if this service also needs to handle actions other than {@link
    * #SERVICE_INTERFACE}.
+   *
+   * <p>This method will be called on the main thread.
    */
   @CallSuper
   @Override
@@ -378,6 +404,8 @@ public abstract class MediaSessionService extends Service {
    * <p>The default implementation handles the incoming media button events. In this case, the
    * intent will have the action {@link Intent#ACTION_MEDIA_BUTTON}. Override this method if this
    * service also needs to handle actions other than {@link Intent#ACTION_MEDIA_BUTTON}.
+   *
+   * <p>This method will be called on the main thread.
    */
   @CallSuper
   @Override
@@ -417,6 +445,8 @@ public abstract class MediaSessionService extends Service {
    * Called when the service is no longer used and is being removed.
    *
    * <p>Override this method if you need your own clean up.
+   *
+   * <p>This method will be called on the main thread.
    */
   @CallSuper
   @Override
@@ -456,7 +486,7 @@ public abstract class MediaSessionService extends Service {
    * @param session A session that needs notification update.
    */
   public void onUpdateNotification(MediaSession session) {
-    setDefaultMethodCalled(true);
+    defaultMethodCalled = true;
   }
 
   /**
@@ -483,13 +513,15 @@ public abstract class MediaSessionService extends Service {
    * <p>Apps targeting {@code SDK_INT >= 28} must request the permission, {@link
    * android.Manifest.permission#FOREGROUND_SERVICE}.
    *
+   * <p>This method will be called on the main thread.
+   *
    * @param session A session that needs notification update.
    * @param startInForegroundRequired Whether the service is required to start in the foreground.
    */
   @UnstableApi
   public void onUpdateNotification(MediaSession session, boolean startInForegroundRequired) {
     onUpdateNotification(session);
-    if (isDefaultMethodCalled()) {
+    if (defaultMethodCalled) {
       getMediaNotificationManager().updateNotification(session, startInForegroundRequired);
     }
   }
@@ -498,6 +530,8 @@ public abstract class MediaSessionService extends Service {
    * Sets the {@link MediaNotification.Provider} to customize notifications.
    *
    * <p>This should be called before {@link #onCreate()} returns.
+   *
+   * <p>This method can be called from any thread.
    */
   @UnstableApi
   protected final void setMediaNotificationProvider(
@@ -514,11 +548,16 @@ public abstract class MediaSessionService extends Service {
     }
   }
 
+  /**
+   * Triggers notification update and handles {@code ForegroundServiceStartNotAllowedException}.
+   *
+   * <p>This method will be called on the main thread.
+   */
   /* package */ boolean onUpdateNotificationInternal(
       MediaSession session, boolean startInForegroundWhenPaused) {
     try {
       boolean startInForegroundRequired =
-          shouldRunInForeground(session, startInForegroundWhenPaused);
+          getMediaNotificationManager().shouldRunInForeground(session, startInForegroundWhenPaused);
       onUpdateNotification(session, startInForegroundRequired);
     } catch (/* ForegroundServiceStartNotAllowedException */ IllegalStateException e) {
       if ((Util.SDK_INT >= 31) && Api31.instanceOfForegroundServiceStartNotAllowedException(e)) {
@@ -531,14 +570,6 @@ public abstract class MediaSessionService extends Service {
     return true;
   }
 
-  /* package */ static boolean shouldRunInForeground(
-      MediaSession session, boolean startInForegroundWhenPaused) {
-    Player player = session.getPlayer();
-    return (player.getPlayWhenReady() || startInForegroundWhenPaused)
-        && (player.getPlaybackState() == Player.STATE_READY
-            || player.getPlaybackState() == Player.STATE_BUFFERING);
-  }
-
   private MediaNotificationManager getMediaNotificationManager() {
     synchronized (lock) {
       if (mediaNotificationManager == null) {
@@ -570,18 +601,6 @@ public abstract class MediaSessionService extends Service {
     }
   }
 
-  private boolean isDefaultMethodCalled() {
-    synchronized (lock) {
-      return this.defaultMethodCalled;
-    }
-  }
-
-  private void setDefaultMethodCalled(boolean defaultMethodCalled) {
-    synchronized (lock) {
-      this.defaultMethodCalled = defaultMethodCalled;
-    }
-  }
-
   @RequiresApi(31)
   private void onForegroundServiceStartNotAllowedException() {
     mainHandler.post(

libraries/session/src/main/java/androidx/media3/session/MediaSessionStub.java

@@ -70,7 +70,10 @@ import androidx.media3.common.MediaMetadata;
 import androidx.media3.common.PlaybackParameters;
 import androidx.media3.common.Player;
 import androidx.media3.common.Rating;
+import androidx.media3.common.TrackGroup;
+import androidx.media3.common.TrackSelectionOverride;
 import androidx.media3.common.TrackSelectionParameters;
+import androidx.media3.common.Tracks;
 import androidx.media3.common.util.Assertions;
 import androidx.media3.common.util.BundleableUtil;
 import androidx.media3.common.util.Consumer;
@@ -82,6 +85,7 @@ import androidx.media3.session.MediaSession.ControllerCb;
 import androidx.media3.session.MediaSession.ControllerInfo;
 import androidx.media3.session.MediaSession.MediaItemsWithStartPosition;
 import androidx.media3.session.SessionCommand.CommandCode;
+import com.google.common.collect.ImmutableBiMap;
 import com.google.common.collect.ImmutableList;
 import com.google.common.util.concurrent.Futures;
 import com.google.common.util.concurrent.ListenableFuture;
@@ -113,6 +117,9 @@ import java.util.concurrent.ExecutionException;
   private final ConnectedControllersManager<IBinder> connectedControllersManager;
   private final Set<ControllerInfo> pendingControllers;
 
+  private ImmutableBiMap<TrackGroup, String> trackGroupIdMap;
+  private int nextUniqueTrackGroupIdPrefix;
+
   public MediaSessionStub(MediaSessionImpl sessionImpl) {
     // Initialize members with params.
     this.sessionImpl = new WeakReference<>(sessionImpl);
@@ -120,6 +127,7 @@ import java.util.concurrent.ExecutionException;
     connectedControllersManager = new ConnectedControllersManager<>(sessionImpl);
     // ConcurrentHashMap has a bug in APIs 21-22 that can result in lost updates.
     pendingControllers = Collections.synchronizedSet(new HashSet<>());
+    trackGroupIdMap = ImmutableBiMap.of();
   }
 
   public ConnectedControllersManager<IBinder> getConnectedControllersManager() {
@@ -493,6 +501,7 @@ import java.util.concurrent.ExecutionException;
             // session/controller.
             PlayerWrapper playerWrapper = sessionImpl.getPlayerWrapper();
             PlayerInfo playerInfo = playerWrapper.createPlayerInfoForBundling();
+            playerInfo = generateAndCacheUniqueTrackGroupIds(playerInfo);
             ConnectionState state =
                 new ConnectionState(
                     MediaLibraryInfo.VERSION_INT,
@@ -1435,7 +1444,11 @@ import java.util.concurrent.ExecutionException;
         sequenceNumber,
         COMMAND_SET_TRACK_SELECTION_PARAMETERS,
         sendSessionResultSuccess(
-            player -> player.setTrackSelectionParameters(trackSelectionParameters)));
+            player -> {
+              TrackSelectionParameters updatedParameters =
+                  updateOverridesUsingUniqueTrackGroupIds(trackSelectionParameters);
+              player.setTrackSelectionParameters(updatedParameters);
+            }));
   }
 
   //////////////////////////////////////////////////////////////////////////////////////////////
@@ -1622,6 +1635,65 @@ import java.util.concurrent.ExecutionException;
                 librarySessionImpl.onUnsubscribeOnHandler(controller, parentId)));
   }
 
+  /* package */ PlayerInfo generateAndCacheUniqueTrackGroupIds(PlayerInfo playerInfo) {
+    ImmutableList<Tracks.Group> trackGroups = playerInfo.currentTracks.getGroups();
+    ImmutableList.Builder<Tracks.Group> updatedTrackGroups = ImmutableList.builder();
+    ImmutableBiMap.Builder<TrackGroup, String> updatedTrackGroupIdMap = ImmutableBiMap.builder();
+    for (int i = 0; i < trackGroups.size(); i++) {
+      Tracks.Group trackGroup = trackGroups.get(i);
+      TrackGroup mediaTrackGroup = trackGroup.getMediaTrackGroup();
+      @Nullable String uniqueId = trackGroupIdMap.get(mediaTrackGroup);
+      if (uniqueId == null) {
+        uniqueId = generateUniqueTrackGroupId(mediaTrackGroup);
+      }
+      updatedTrackGroupIdMap.put(mediaTrackGroup, uniqueId);
+      updatedTrackGroups.add(trackGroup.copyWithId(uniqueId));
+    }
+    trackGroupIdMap = updatedTrackGroupIdMap.buildOrThrow();
+    playerInfo = playerInfo.copyWithCurrentTracks(new Tracks(updatedTrackGroups.build()));
+    if (playerInfo.trackSelectionParameters.overrides.isEmpty()) {
+      return playerInfo;
+    }
+    TrackSelectionParameters.Builder updatedTrackSelectionParameters =
+        playerInfo.trackSelectionParameters.buildUpon().clearOverrides();
+    for (TrackSelectionOverride override : playerInfo.trackSelectionParameters.overrides.values()) {
+      TrackGroup trackGroup = override.mediaTrackGroup;
+      @Nullable String uniqueId = trackGroupIdMap.get(trackGroup);
+      if (uniqueId != null) {
+        updatedTrackSelectionParameters.addOverride(
+            new TrackSelectionOverride(trackGroup.copyWithId(uniqueId), override.trackIndices));
+      } else {
+        updatedTrackSelectionParameters.addOverride(override);
+      }
+    }
+    return playerInfo.copyWithTrackSelectionParameters(updatedTrackSelectionParameters.build());
+  }
+
+  private TrackSelectionParameters updateOverridesUsingUniqueTrackGroupIds(
+      TrackSelectionParameters trackSelectionParameters) {
+    if (trackSelectionParameters.overrides.isEmpty()) {
+      return trackSelectionParameters;
+    }
+    TrackSelectionParameters.Builder updateTrackSelectionParameters =
+        trackSelectionParameters.buildUpon().clearOverrides();
+    for (TrackSelectionOverride override : trackSelectionParameters.overrides.values()) {
+      TrackGroup trackGroup = override.mediaTrackGroup;
+      @Nullable TrackGroup originalTrackGroup = trackGroupIdMap.inverse().get(trackGroup.id);
+      if (originalTrackGroup != null
+          && override.mediaTrackGroup.length == originalTrackGroup.length) {
+        updateTrackSelectionParameters.addOverride(
+            new TrackSelectionOverride(originalTrackGroup, override.trackIndices));
+      } else {
+        updateTrackSelectionParameters.addOverride(override);
+      }
+    }
+    return updateTrackSelectionParameters.build();
+  }
+
+  private String generateUniqueTrackGroupId(TrackGroup trackGroup) {
+    return Util.intToStringMaxRadix(nextUniqueTrackGroupIdPrefix++) + "-" + trackGroup.id;
+  }
+
   /** Common interface for code snippets to handle all incoming commands from the controller. */
   private interface SessionTask<T, K extends MediaSessionImpl> {
     T run(K sessionImpl, ControllerInfo controller, int sequenceNumber);

libraries/session/src/main/java/androidx/media3/session/QueueTimeline.java

@@ -16,7 +16,6 @@
 package androidx.media3.session;
 
 import static androidx.media3.common.util.Assertions.checkArgument;
-import static androidx.media3.common.util.Assertions.checkNotNull;
 
 import android.support.v4.media.MediaMetadataCompat;
 import android.support.v4.media.session.MediaSessionCompat.QueueItem;
@@ -27,11 +26,8 @@ import androidx.media3.common.Timeline;
 import androidx.media3.common.util.Util;
 import com.google.common.base.Objects;
 import com.google.common.collect.ImmutableList;
-import com.google.common.collect.ImmutableMap;
 import java.util.ArrayList;
-import java.util.HashMap;
 import java.util.List;
-import java.util.Map;
 
 /**
  * An immutable class to represent the current {@link Timeline} backed by {@linkplain QueueItem
@@ -45,42 +41,33 @@ import java.util.Map;
 /* package */ final class QueueTimeline extends Timeline {
 
   public static final QueueTimeline DEFAULT =
-      new QueueTimeline(ImmutableList.of(), ImmutableMap.of(), /* fakeMediaItem= */ null);
+      new QueueTimeline(ImmutableList.of(), /* fakeMediaItem= */ null);
 
   private static final Object FAKE_WINDOW_UID = new Object();
 
-  private final ImmutableList<MediaItem> mediaItems;
+  private final ImmutableList<QueuedMediaItem> queuedMediaItems;
-  private final ImmutableMap<MediaItem, Long> mediaItemToQueueIdMap;
   @Nullable private final MediaItem fakeMediaItem;
 
-  /** Creates a new instance. */
-  public QueueTimeline(QueueTimeline queueTimeline) {
-    this.mediaItems = queueTimeline.mediaItems;
-    this.mediaItemToQueueIdMap = queueTimeline.mediaItemToQueueIdMap;
-    this.fakeMediaItem = queueTimeline.fakeMediaItem;
-  }
-
   private QueueTimeline(
-      ImmutableList<MediaItem> mediaItems,
+      ImmutableList<QueuedMediaItem> queuedMediaItems, @Nullable MediaItem fakeMediaItem) {
-      ImmutableMap<MediaItem, Long> mediaItemToQueueIdMap,
+    this.queuedMediaItems = queuedMediaItems;
-      @Nullable MediaItem fakeMediaItem) {
-    this.mediaItems = mediaItems;
-    this.mediaItemToQueueIdMap = mediaItemToQueueIdMap;
     this.fakeMediaItem = fakeMediaItem;
   }
 
   /** Creates a {@link QueueTimeline} from a list of {@linkplain QueueItem queue items}. */
   public static QueueTimeline create(List<QueueItem> queue) {
-    ImmutableList.Builder<MediaItem> mediaItemsBuilder = new ImmutableList.Builder<>();
+    ImmutableList.Builder<QueuedMediaItem> queuedMediaItemsBuilder = new ImmutableList.Builder<>();
-    ImmutableMap.Builder<MediaItem, Long> mediaItemToQueueIdMap = new ImmutableMap.Builder<>();
     for (int i = 0; i < queue.size(); i++) {
       QueueItem queueItem = queue.get(i);
       MediaItem mediaItem = MediaUtils.convertToMediaItem(queueItem);
-      mediaItemsBuilder.add(mediaItem);
+      queuedMediaItemsBuilder.add(new QueuedMediaItem(mediaItem, queueItem.getQueueId()));
-      mediaItemToQueueIdMap.put(mediaItem, queueItem.getQueueId());
     }
-    return new QueueTimeline(
+    return new QueueTimeline(queuedMediaItemsBuilder.build(), /* fakeMediaItem= */ null);
-        mediaItemsBuilder.build(), mediaItemToQueueIdMap.buildOrThrow(), /* fakeMediaItem= */ null);
+  }
+
+  /** Returns a copy of the current queue timeline. */
+  public QueueTimeline copy() {
+    return new QueueTimeline(queuedMediaItems, fakeMediaItem);
   }
 
   /**
@@ -91,9 +78,9 @@ import java.util.Map;
    * @return The corresponding queue ID or {@link QueueItem#UNKNOWN_ID} if not known.
    */
   public long getQueueId(int mediaItemIndex) {
-    MediaItem mediaItem = getMediaItemAt(mediaItemIndex);
+    return mediaItemIndex >= 0 && mediaItemIndex < queuedMediaItems.size()
-    @Nullable Long queueId = mediaItemToQueueIdMap.get(mediaItem);
+        ? queuedMediaItems.get(mediaItemIndex).queueId
-    return queueId == null ? QueueItem.UNKNOWN_ID : queueId;
+        : QueueItem.UNKNOWN_ID;
   }
 
   /**
@@ -103,7 +90,7 @@ import java.util.Map;
    * @return A new {@link QueueTimeline} reflecting the update.
    */
   public QueueTimeline copyWithFakeMediaItem(@Nullable MediaItem fakeMediaItem) {
-    return new QueueTimeline(mediaItems, mediaItemToQueueIdMap, fakeMediaItem);
+    return new QueueTimeline(queuedMediaItems, fakeMediaItem);
   }
 
   /**
@@ -115,23 +102,17 @@ import java.util.Map;
    */
   public QueueTimeline copyWithNewMediaItem(int replaceIndex, MediaItem newMediaItem) {
     checkArgument(
-        replaceIndex < mediaItems.size()
+        replaceIndex < queuedMediaItems.size()
-            || (replaceIndex == mediaItems.size() && fakeMediaItem != null));
+            || (replaceIndex == queuedMediaItems.size() && fakeMediaItem != null));
-    if (replaceIndex == mediaItems.size()) {
+    if (replaceIndex == queuedMediaItems.size()) {
-      return new QueueTimeline(mediaItems, mediaItemToQueueIdMap, newMediaItem);
+      return new QueueTimeline(queuedMediaItems, newMediaItem);
     }
-    MediaItem oldMediaItem = mediaItems.get(replaceIndex);
+    long queueId = queuedMediaItems.get(replaceIndex).queueId;
-    // Create the new play list.
+    ImmutableList.Builder<QueuedMediaItem> queuedItemsBuilder = new ImmutableList.Builder<>();
-    ImmutableList.Builder<MediaItem> newMediaItemsBuilder = new ImmutableList.Builder<>();
+    queuedItemsBuilder.addAll(queuedMediaItems.subList(0, replaceIndex));
-    newMediaItemsBuilder.addAll(mediaItems.subList(0, replaceIndex));
+    queuedItemsBuilder.add(new QueuedMediaItem(newMediaItem, queueId));
-    newMediaItemsBuilder.add(newMediaItem);
+    queuedItemsBuilder.addAll(queuedMediaItems.subList(replaceIndex + 1, queuedMediaItems.size()));
-    newMediaItemsBuilder.addAll(mediaItems.subList(replaceIndex + 1, mediaItems.size()));
+    return new QueueTimeline(queuedItemsBuilder.build(), fakeMediaItem);
-    // Update the map of items to queue IDs accordingly.
-    Map<MediaItem, Long> newMediaItemToQueueIdMap = new HashMap<>(mediaItemToQueueIdMap);
-    Long queueId = checkNotNull(newMediaItemToQueueIdMap.remove(oldMediaItem));
-    newMediaItemToQueueIdMap.put(newMediaItem, queueId);
-    return new QueueTimeline(
-        newMediaItemsBuilder.build(), ImmutableMap.copyOf(newMediaItemToQueueIdMap), fakeMediaItem);
   }
 
   /**
@@ -143,11 +124,13 @@ import java.util.Map;
    * @return A new {@link QueueTimeline} reflecting the update.
    */
   public QueueTimeline copyWithNewMediaItems(int index, List<MediaItem> newMediaItems) {
-    ImmutableList.Builder<MediaItem> newMediaItemsBuilder = new ImmutableList.Builder<>();
+    ImmutableList.Builder<QueuedMediaItem> queuedItemsBuilder = new ImmutableList.Builder<>();
-    newMediaItemsBuilder.addAll(mediaItems.subList(0, index));
+    queuedItemsBuilder.addAll(queuedMediaItems.subList(0, index));
-    newMediaItemsBuilder.addAll(newMediaItems);
+    for (int i = 0; i < newMediaItems.size(); i++) {
-    newMediaItemsBuilder.addAll(mediaItems.subList(index, mediaItems.size()));
+      queuedItemsBuilder.add(new QueuedMediaItem(newMediaItems.get(i), QueueItem.UNKNOWN_ID));
-    return new QueueTimeline(newMediaItemsBuilder.build(), mediaItemToQueueIdMap, fakeMediaItem);
+    }
+    queuedItemsBuilder.addAll(queuedMediaItems.subList(index, queuedMediaItems.size()));
+    return new QueueTimeline(queuedItemsBuilder.build(), fakeMediaItem);
   }
 
   /**
@@ -158,10 +141,10 @@ import java.util.Map;
    * @return A new {@link QueueTimeline} reflecting the update.
    */
   public QueueTimeline copyWithRemovedMediaItems(int fromIndex, int toIndex) {
-    ImmutableList.Builder<MediaItem> newMediaItemsBuilder = new ImmutableList.Builder<>();
+    ImmutableList.Builder<QueuedMediaItem> queuedItemsBuilder = new ImmutableList.Builder<>();
-    newMediaItemsBuilder.addAll(mediaItems.subList(0, fromIndex));
+    queuedItemsBuilder.addAll(queuedMediaItems.subList(0, fromIndex));
-    newMediaItemsBuilder.addAll(mediaItems.subList(toIndex, mediaItems.size()));
+    queuedItemsBuilder.addAll(queuedMediaItems.subList(toIndex, queuedMediaItems.size()));
-    return new QueueTimeline(newMediaItemsBuilder.build(), mediaItemToQueueIdMap, fakeMediaItem);
+    return new QueueTimeline(queuedItemsBuilder.build(), fakeMediaItem);
   }
 
   /**
@@ -173,50 +156,45 @@ import java.util.Map;
    * @return A new {@link QueueTimeline} reflecting the update.
    */
   public QueueTimeline copyWithMovedMediaItems(int fromIndex, int toIndex, int newIndex) {
-    List<MediaItem> list = new ArrayList<>(mediaItems);
+    List<QueuedMediaItem> list = new ArrayList<>(queuedMediaItems);
     Util.moveItems(list, fromIndex, toIndex, newIndex);
-    return new QueueTimeline(
+    return new QueueTimeline(ImmutableList.copyOf(list), fakeMediaItem);
-        new ImmutableList.Builder<MediaItem>().addAll(list).build(),
-        mediaItemToQueueIdMap,
-        fakeMediaItem);
   }
 
-  /**
+  /** Returns whether the timeline contains the given {@link MediaItem}. */
-   * Returns the media item index of the given media item in the timeline, or {@link C#INDEX_UNSET}
+  public boolean contains(MediaItem mediaItem) {
-   * if the item is not part of this timeline.
-   *
-   * @param mediaItem The media item of interest.
-   * @return The index of the item or {@link C#INDEX_UNSET} if the item is not part of the timeline.
-   */
-  public int indexOf(MediaItem mediaItem) {
     if (mediaItem.equals(fakeMediaItem)) {
-      return mediaItems.size();
+      return true;
     }
-    int mediaItemIndex = mediaItems.indexOf(mediaItem);
+    for (int i = 0; i < queuedMediaItems.size(); i++) {
-    return mediaItemIndex == -1 ? C.INDEX_UNSET : mediaItemIndex;
+      if (mediaItem.equals(queuedMediaItems.get(i).mediaItem)) {
+        return true;
+      }
+    }
+    return false;
   }
 
   @Nullable
   public MediaItem getMediaItemAt(int mediaItemIndex) {
-    if (mediaItemIndex >= 0 && mediaItemIndex < mediaItems.size()) {
+    if (mediaItemIndex >= 0 && mediaItemIndex < queuedMediaItems.size()) {
-      return mediaItems.get(mediaItemIndex);
+      return queuedMediaItems.get(mediaItemIndex).mediaItem;
     }
-    return (mediaItemIndex == mediaItems.size()) ? fakeMediaItem : null;
+    return (mediaItemIndex == queuedMediaItems.size()) ? fakeMediaItem : null;
   }
 
   @Override
   public int getWindowCount() {
-    return mediaItems.size() + ((fakeMediaItem == null) ? 0 : 1);
+    return queuedMediaItems.size() + ((fakeMediaItem == null) ? 0 : 1);
   }
 
   @Override
   public Window getWindow(int windowIndex, Window window, long defaultPositionProjectionUs) {
     // TODO(b/149713425): Set duration if it's available from MediaMetadataCompat.
     MediaItem mediaItem;
-    if (windowIndex == mediaItems.size() && fakeMediaItem != null) {
+    if (windowIndex == queuedMediaItems.size() && fakeMediaItem != null) {
       mediaItem = fakeMediaItem;
     } else {
-      mediaItem = mediaItems.get(windowIndex);
+      mediaItem = queuedMediaItems.get(windowIndex).mediaItem;
     }
     return getWindow(window, mediaItem, windowIndex);
   }
@@ -257,14 +235,13 @@ import java.util.Map;
       return false;
     }
     QueueTimeline other = (QueueTimeline) obj;
-    return Objects.equal(mediaItems, other.mediaItems)
+    return Objects.equal(queuedMediaItems, other.queuedMediaItems)
-        && Objects.equal(mediaItemToQueueIdMap, other.mediaItemToQueueIdMap)
         && Objects.equal(fakeMediaItem, other.fakeMediaItem);
   }
 
   @Override
   public int hashCode() {
-    return Objects.hashCode(mediaItems, mediaItemToQueueIdMap, fakeMediaItem);
+    return Objects.hashCode(queuedMediaItems, fakeMediaItem);
   }
 
   private static Window getWindow(Window window, MediaItem mediaItem, int windowIndex) {
@@ -285,4 +262,35 @@ import java.util.Map;
         /* positionInFirstPeriodUs= */ 0);
     return window;
   }
+
+  private static final class QueuedMediaItem {
+
+    public final MediaItem mediaItem;
+    public final long queueId;
+
+    public QueuedMediaItem(MediaItem mediaItem, long queueId) {
+      this.mediaItem = mediaItem;
+      this.queueId = queueId;
+    }
+
+    @Override
+    public boolean equals(@Nullable Object o) {
+      if (this == o) {
+        return true;
+      }
+      if (!(o instanceof QueuedMediaItem)) {
+        return false;
+      }
+      QueuedMediaItem that = (QueuedMediaItem) o;
+      return queueId == that.queueId && mediaItem.equals(that.mediaItem);
+    }
+
+    @Override
+    public int hashCode() {
+      int result = 7;
+      result = 31 * result + (int) (queueId ^ (queueId >>> 32));
+      result = 31 * result + mediaItem.hashCode();
+      return result;
+    }
+  }
 }

libraries/session/src/main/java/androidx/media3/session/SessionCommand.java

@@ -123,6 +123,10 @@ public final class SessionCommand implements Bundleable {
 
   /**
    * The extra bundle of a custom command. It will be {@link Bundle#EMPTY} for a predefined command.
+   *
+   * <p>Interoperability: This value is not used when the command is sent to a legacy {@link
+   * android.support.v4.media.session.MediaSessionCompat} or {@link
+   * android.support.v4.media.session.MediaControllerCompat}.
    */
   public final Bundle customExtras;
 
@@ -143,7 +147,9 @@ public final class SessionCommand implements Bundleable {
    * Creates a custom command.
    *
    * @param action The action of this custom command.
-   * @param extras An extra bundle for this custom command.
+   * @param extras An extra bundle for this custom command. This value is not used when the command
+   *     is sent to a legacy {@link android.support.v4.media.session.MediaSessionCompat} or {@link
+   *     android.support.v4.media.session.MediaControllerCompat}.
    */
   public SessionCommand(String action, Bundle extras) {
     commandCode = COMMAND_CODE_CUSTOM;

libraries/session/src/test/java/androidx/media3/session/DefaultMediaNotificationProviderTest.java

@@ -36,6 +36,7 @@ import android.content.Context;
 import android.graphics.Bitmap;
 import android.net.Uri;
 import android.os.Bundle;
+import android.os.Handler;
 import android.os.Looper;
 import androidx.annotation.Nullable;
 import androidx.core.app.NotificationCompat;
@@ -785,6 +786,7 @@ public class DefaultMediaNotificationProviderTest {
     when(mockMediaSession.getPlayer()).thenReturn(mockPlayer);
     MediaSessionImpl mockMediaSessionImpl = mock(MediaSessionImpl.class);
     when(mockMediaSession.getImpl()).thenReturn(mockMediaSessionImpl);
+    when(mockMediaSessionImpl.getApplicationHandler()).thenReturn(new Handler(Looper.myLooper()));
     when(mockMediaSessionImpl.getUri()).thenReturn(Uri.parse("https://example.test"));
     return mockMediaSession;
   }

libraries/session/src/test/java/androidx/media3/session/MediaSessionServiceTest.java

@@ -0,0 +1,144 @@
+/*
+ * Copyright 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package androidx.media3.session;
+
+import static androidx.media3.test.utils.robolectric.RobolectricUtil.runMainLooperUntil;
+import static com.google.common.truth.Truth8.assertThat;
+import static java.util.Arrays.stream;
+
+import android.app.NotificationManager;
+import android.content.Context;
+import android.os.Handler;
+import android.os.HandlerThread;
+import android.service.notification.StatusBarNotification;
+import androidx.annotation.Nullable;
+import androidx.media3.common.MediaItem;
+import androidx.media3.exoplayer.ExoPlayer;
+import androidx.media3.test.utils.TestExoPlayerBuilder;
+import androidx.test.core.app.ApplicationProvider;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.Robolectric;
+import org.robolectric.android.controller.ServiceController;
+import org.robolectric.shadows.ShadowLooper;
+
+@RunWith(AndroidJUnit4.class)
+public class MediaSessionServiceTest {
+
+  @Test
+  public void service_multipleSessionsOnMainThread_createsNotificationForEachSession() {
+    Context context = ApplicationProvider.getApplicationContext();
+    ExoPlayer player1 = new TestExoPlayerBuilder(context).build();
+    ExoPlayer player2 = new TestExoPlayerBuilder(context).build();
+    MediaSession session1 = new MediaSession.Builder(context, player1).setId("1").build();
+    MediaSession session2 = new MediaSession.Builder(context, player2).setId("2").build();
+    ServiceController<TestService> serviceController = Robolectric.buildService(TestService.class);
+    TestService service = serviceController.create().get();
+    service.setMediaNotificationProvider(
+        new DefaultMediaNotificationProvider(
+            service,
+            session -> 2000 + Integer.parseInt(session.getId()),
+            DefaultMediaNotificationProvider.DEFAULT_CHANNEL_ID,
+            DefaultMediaNotificationProvider.DEFAULT_CHANNEL_NAME_RESOURCE_ID));
+
+    service.addSession(session1);
+    service.addSession(session2);
+    // Start the players so that we also create notifications for them.
+    player1.setMediaItem(MediaItem.fromUri("asset:///media/mp4/sample.mp4"));
+    player1.prepare();
+    player1.play();
+    player2.setMediaItem(MediaItem.fromUri("asset:///media/mp4/sample.mp4"));
+    player2.prepare();
+    player2.play();
+    ShadowLooper.idleMainLooper();
+
+    NotificationManager notificationService =
+        (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
+    assertThat(
+            stream(notificationService.getActiveNotifications()).map(StatusBarNotification::getId))
+        .containsExactly(2001, 2002);
+
+    serviceController.destroy();
+    session1.release();
+    session2.release();
+    player1.release();
+    player2.release();
+  }
+
+  @Test
+  public void service_multipleSessionsOnDifferentThreads_createsNotificationForEachSession()
+      throws Exception {
+    Context context = ApplicationProvider.getApplicationContext();
+    HandlerThread thread1 = new HandlerThread("player1");
+    HandlerThread thread2 = new HandlerThread("player2");
+    thread1.start();
+    thread2.start();
+    ExoPlayer player1 = new TestExoPlayerBuilder(context).setLooper(thread1.getLooper()).build();
+    ExoPlayer player2 = new TestExoPlayerBuilder(context).setLooper(thread2.getLooper()).build();
+    MediaSession session1 = new MediaSession.Builder(context, player1).setId("1").build();
+    MediaSession session2 = new MediaSession.Builder(context, player2).setId("2").build();
+    ServiceController<TestService> serviceController = Robolectric.buildService(TestService.class);
+    TestService service = serviceController.create().get();
+    service.setMediaNotificationProvider(
+        new DefaultMediaNotificationProvider(
+            service,
+            session -> 2000 + Integer.parseInt(session.getId()),
+            DefaultMediaNotificationProvider.DEFAULT_CHANNEL_ID,
+            DefaultMediaNotificationProvider.DEFAULT_CHANNEL_NAME_RESOURCE_ID));
+    NotificationManager notificationService =
+        (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
+
+    service.addSession(session1);
+    service.addSession(session2);
+    // Start the players so that we also create notifications for them.
+    new Handler(thread1.getLooper())
+        .post(
+            () -> {
+              player1.setMediaItem(MediaItem.fromUri("asset:///media/mp4/sample.mp4"));
+              player1.prepare();
+              player1.play();
+            });
+    new Handler(thread2.getLooper())
+        .post(
+            () -> {
+              player2.setMediaItem(MediaItem.fromUri("asset:///media/mp4/sample.mp4"));
+              player2.prepare();
+              player2.play();
+            });
+    runMainLooperUntil(() -> notificationService.getActiveNotifications().length == 2);
+
+    assertThat(
+            stream(notificationService.getActiveNotifications()).map(StatusBarNotification::getId))
+        .containsExactly(2001, 2002);
+
+    serviceController.destroy();
+    session1.release();
+    session2.release();
+    new Handler(thread1.getLooper()).post(player1::release);
+    new Handler(thread2.getLooper()).post(player2::release);
+    thread1.quit();
+    thread2.quit();
+  }
+
+  private static final class TestService extends MediaSessionService {
+    @Nullable
+    @Override
+    public MediaSession onGetSession(MediaSession.ControllerInfo controllerInfo) {
+      return null; // No need to support binding or pending intents for this test.
+    }
+  }
+}

libraries/test_session_common/src/main/java/androidx/media3/test/session/common/CommonConstants.java

@@ -103,6 +103,7 @@ public class CommonConstants {
   public static final String KEY_MAX_SEEK_TO_PREVIOUS_POSITION_MS = "maxSeekToPreviousPositionMs";
   public static final String KEY_TRACK_SELECTION_PARAMETERS = "trackSelectionParameters";
   public static final String KEY_CURRENT_TRACKS = "currentTracks";
+  public static final String KEY_AVAILABLE_COMMANDS = "availableCommands";
 
   // SessionCompat arguments
   public static final String KEY_SESSION_COMPAT_TOKEN = "sessionCompatToken";

libraries/test_session_current/src/androidTest/java/androidx/media3/session/MediaControllerCompatCallbackWithMediaSessionTest.java

@@ -980,6 +980,35 @@ public class MediaControllerCompatCallbackWithMediaSessionTest {
     assertThat(TestUtils.equals(receivedSessionExtras.get(1), sessionExtras)).isTrue();
   }
 
+  @Test
+  public void broadcastCustomCommand_cnSessionEventCalled() throws Exception {
+    Bundle commandCallExtras = new Bundle();
+    commandCallExtras.putString("key-0", "value-0");
+    // Specify session command extras to see that they are NOT used.
+    Bundle sessionCommandExtras = new Bundle();
+    sessionCommandExtras.putString("key-0", "value-1");
+    SessionCommand sessionCommand = new SessionCommand("custom_action", sessionCommandExtras);
+    CountDownLatch latch = new CountDownLatch(1);
+    AtomicReference<String> receivedCommand = new AtomicReference<>();
+    AtomicReference<Bundle> receivedCommandExtras = new AtomicReference<>();
+    MediaControllerCompat.Callback callback =
+        new MediaControllerCompat.Callback() {
+          @Override
+          public void onSessionEvent(String event, Bundle extras) {
+            receivedCommand.set(event);
+            receivedCommandExtras.set(extras);
+            latch.countDown();
+          }
+        };
+    controllerCompat.registerCallback(callback, handler);
+
+    session.broadcastCustomCommand(sessionCommand, commandCallExtras);
+
+    assertThat(latch.await(TIMEOUT_MS, MILLISECONDS)).isTrue();
+    assertThat(receivedCommand.get()).isEqualTo("custom_action");
+    assertThat(TestUtils.equals(receivedCommandExtras.get(), commandCallExtras)).isTrue();
+  }
+
   @Test
   public void onMediaItemTransition_updatesLegacyMetadataAndPlaybackState_correctModelConversion()
       throws Exception {
@@ -1056,7 +1085,8 @@ public class MediaControllerCompatCallbackWithMediaSessionTest {
   }
 
   @Test
-  public void onMediaMetadataChanged_updatesLegacyMetadata_correctModelConversion()
+  public void
+      onMediaMetadataChanged_withGetMetadataAndGetCurrentMediaItemCommand_updatesLegacyMetadata()
           throws Exception {
     int testItemIndex = 3;
     String testDisplayTitle = "displayTitle";
@@ -1071,6 +1101,12 @@ public class MediaControllerCompatCallbackWithMediaSessionTest {
             .setMediaId(testMediaItems.get(testItemIndex).mediaId)
             .setMediaMetadata(testMediaMetadata)
             .build());
+    session
+        .getMockPlayer()
+        .notifyAvailableCommandsChanged(
+            new Player.Commands.Builder()
+                .addAll(Player.COMMAND_GET_METADATA, Player.COMMAND_GET_CURRENT_MEDIA_ITEM)
+                .build());
     session.getMockPlayer().setTimeline(new PlaylistTimeline(testMediaItems));
     session.getMockPlayer().setCurrentMediaItemIndex(testItemIndex);
     session.getMockPlayer().setDuration(testDurationMs);
@@ -1102,6 +1138,49 @@ public class MediaControllerCompatCallbackWithMediaSessionTest {
     assertThat(getterMetadataCompat.getString(METADATA_KEY_MEDIA_ID)).isEqualTo(testCurrentMediaId);
   }
 
+  @Test
+  public void onMediaMetadataChanged_withGetMetadataCommandOnly_updatesLegacyMetadata()
+      throws Exception {
+    int testItemIndex = 3;
+    String testDisplayTitle = "displayTitle";
+    List<MediaItem> testMediaItems = MediaTestUtils.createMediaItems(/* size= */ 5);
+    MediaMetadata testMediaMetadata =
+        new MediaMetadata.Builder().setTitle(testDisplayTitle).build();
+    testMediaItems.set(
+        testItemIndex,
+        new MediaItem.Builder()
+            .setMediaId(testMediaItems.get(testItemIndex).mediaId)
+            .setMediaMetadata(testMediaMetadata)
+            .build());
+    session
+        .getMockPlayer()
+        .notifyAvailableCommandsChanged(
+            new Player.Commands.Builder().add(Player.COMMAND_GET_METADATA).build());
+    session.getMockPlayer().setTimeline(new PlaylistTimeline(testMediaItems));
+    session.getMockPlayer().setCurrentMediaItemIndex(testItemIndex);
+    AtomicReference<MediaMetadataCompat> metadataRef = new AtomicReference<>();
+    CountDownLatch latchForMetadata = new CountDownLatch(1);
+    MediaControllerCompat.Callback callback =
+        new MediaControllerCompat.Callback() {
+          @Override
+          public void onMetadataChanged(MediaMetadataCompat metadata) {
+            metadataRef.set(metadata);
+            latchForMetadata.countDown();
+          }
+        };
+    controllerCompat.registerCallback(callback, handler);
+
+    session.getMockPlayer().notifyMediaMetadataChanged(testMediaMetadata);
+
+    assertThat(latchForMetadata.await(TIMEOUT_MS, MILLISECONDS)).isTrue();
+    MediaMetadataCompat parameterMetadataCompat = metadataRef.get();
+    MediaMetadataCompat getterMetadataCompat = controllerCompat.getMetadata();
+    assertThat(parameterMetadataCompat.getString(MediaMetadataCompat.METADATA_KEY_DISPLAY_TITLE))
+        .isEqualTo(testDisplayTitle);
+    assertThat(getterMetadataCompat.getString(MediaMetadataCompat.METADATA_KEY_DISPLAY_TITLE))
+        .isEqualTo(testDisplayTitle);
+  }
+
   @Test
   public void playlistChange() throws Exception {
     AtomicReference<List<QueueItem>> queueRef = new AtomicReference<>();

libraries/test_session_current/src/androidTest/java/androidx/media3/session/MediaControllerListenerTest.java

@@ -326,6 +326,8 @@ public class MediaControllerListenerTest {
     @Player.RepeatMode int testRepeatMode = Player.REPEAT_MODE_ALL;
     int testCurrentAdGroupIndex = 33;
     int testCurrentAdIndexInAdGroup = 11;
+    Commands testCommands =
+        new Commands.Builder().addAllCommands().remove(Player.COMMAND_STOP).build();
     AtomicInteger stateRef = new AtomicInteger();
     AtomicReference<Timeline> timelineRef = new AtomicReference<>();
     AtomicReference<MediaMetadata> playlistMetadataRef = new AtomicReference<>();
@@ -335,7 +337,8 @@ public class MediaControllerListenerTest {
     AtomicInteger currentAdIndexInAdGroupRef = new AtomicInteger();
     AtomicBoolean shuffleModeEnabledRef = new AtomicBoolean();
     AtomicInteger repeatModeRef = new AtomicInteger();
-    CountDownLatch latch = new CountDownLatch(7);
+    AtomicReference<Commands> commandsRef = new AtomicReference<>();
+    CountDownLatch latch = new CountDownLatch(8);
     MediaController controller = controllerTestRule.createController(remoteSession.getToken());
     threadTestRule
         .getHandler()
@@ -343,6 +346,12 @@ public class MediaControllerListenerTest {
             () ->
                 controller.addListener(
                     new Player.Listener() {
+                      @Override
+                      public void onAvailableCommandsChanged(Commands availableCommands) {
+                        commandsRef.set(availableCommands);
+                        latch.countDown();
+                      }
+
                       @Override
                       public void onAudioAttributesChanged(AudioAttributes attributes) {
                         audioAttributesRef.set(attributes);
@@ -402,6 +411,7 @@ public class MediaControllerListenerTest {
             .setIsPlayingAd(true)
             .setCurrentAdGroupIndex(testCurrentAdGroupIndex)
             .setCurrentAdIndexInAdGroup(testCurrentAdIndexInAdGroup)
+            .setAvailableCommands(testCommands)
             .build();
 
     remoteSession.setPlayer(playerConfig);
@@ -415,6 +425,7 @@ public class MediaControllerListenerTest {
     assertThat(currentAdIndexInAdGroupRef.get()).isEqualTo(testCurrentAdIndexInAdGroup);
     assertThat(shuffleModeEnabledRef.get()).isEqualTo(testShuffleModeEnabled);
     assertThat(repeatModeRef.get()).isEqualTo(testRepeatMode);
+    assertThat(commandsRef.get()).isEqualTo(testCommands);
   }
 
   @Test
@@ -1084,15 +1095,16 @@ public class MediaControllerListenerTest {
 
     assertThat(latch.await(TIMEOUT_MS, MILLISECONDS)).isTrue();
     assertThat(initialCurrentTracksRef.get()).isEqualTo(Tracks.EMPTY);
-    assertThat(changedCurrentTracksFromParamRef.get()).isEqualTo(currentTracks);
+    assertThat(changedCurrentTracksFromParamRef.get().getGroups()).hasSize(2);
-    assertThat(changedCurrentTracksFromGetterRef.get()).isEqualTo(currentTracks);
+    assertThat(changedCurrentTracksFromGetterRef.get())
+        .isEqualTo(changedCurrentTracksFromParamRef.get());
     assertThat(capturedEvents).hasSize(2);
     assertThat(getEventsAsList(capturedEvents.get(0))).containsExactly(Player.EVENT_TRACKS_CHANGED);
     assertThat(getEventsAsList(capturedEvents.get(1)))
         .containsExactly(Player.EVENT_IS_LOADING_CHANGED);
     assertThat(changedCurrentTracksFromOnEvents).hasSize(2);
-    assertThat(changedCurrentTracksFromOnEvents.get(0)).isEqualTo(currentTracks);
+    assertThat(changedCurrentTracksFromOnEvents.get(0).getGroups()).hasSize(2);
-    assertThat(changedCurrentTracksFromOnEvents.get(1)).isEqualTo(currentTracks);
+    assertThat(changedCurrentTracksFromOnEvents.get(1).getGroups()).hasSize(2);
     // Assert that an equal instance is not re-sent over the binder.
     assertThat(changedCurrentTracksFromOnEvents.get(0))
         .isSameInstanceAs(changedCurrentTracksFromOnEvents.get(1));

libraries/test_session_current/src/androidTest/java/androidx/media3/session/MediaControllerTest.java

@@ -42,6 +42,7 @@ import androidx.media3.common.IllegalSeekPositionException;
 import androidx.media3.common.MediaItem;
 import androidx.media3.common.MediaLibraryInfo;
 import androidx.media3.common.MediaMetadata;
+import androidx.media3.common.Metadata;
 import androidx.media3.common.PlaybackException;
 import androidx.media3.common.PlaybackParameters;
 import androidx.media3.common.Player;
@@ -50,6 +51,7 @@ import androidx.media3.common.Rating;
 import androidx.media3.common.StarRating;
 import androidx.media3.common.Timeline;
 import androidx.media3.common.TrackGroup;
+import androidx.media3.common.TrackSelectionOverride;
 import androidx.media3.common.TrackSelectionParameters;
 import androidx.media3.common.Tracks;
 import androidx.media3.common.VideoSize;
@@ -427,7 +429,7 @@ public class MediaControllerTest {
     assertThat(seekForwardIncrementRef.get()).isEqualTo(seekForwardIncrementMs);
     assertThat(maxSeekToPreviousPositionMsRef.get()).isEqualTo(maxSeekToPreviousPositionMs);
     assertThat(trackSelectionParametersRef.get()).isEqualTo(trackSelectionParameters);
-    assertThat(currentTracksRef.get()).isEqualTo(currentTracks);
+    assertThat(currentTracksRef.get().getGroups()).hasSize(2);
     assertTimelineMediaItemsEquals(timelineRef.get(), timeline);
     assertThat(currentMediaItemIndexRef.get()).isEqualTo(currentMediaItemIndex);
     assertThat(currentMediaItemRef.get()).isEqualTo(currentMediaItem);
@@ -1211,6 +1213,118 @@ public class MediaControllerTest {
     assertThat(mediaMetadata).isEqualTo(testMediaMetadata);
   }
 
+  @Test
+  public void getCurrentTracks_hasEqualTrackGroupsForEqualGroupsInPlayer() throws Exception {
+    // Include metadata in Format to ensure the track group can't be fully bundled.
+    Tracks initialPlayerTracks =
+        new Tracks(
+            ImmutableList.of(
+                new Tracks.Group(
+                    new TrackGroup(
+                        new Format.Builder().setMetadata(new Metadata()).setId("1").build()),
+                    /* adaptiveSupported= */ false,
+                    /* trackSupport= */ new int[1],
+                    /* trackSelected= */ new boolean[1]),
+                new Tracks.Group(
+                    new TrackGroup(
+                        new Format.Builder().setMetadata(new Metadata()).setId("2").build()),
+                    /* adaptiveSupported= */ false,
+                    /* trackSupport= */ new int[1],
+                    /* trackSelected= */ new boolean[1])));
+    Tracks updatedPlayerTracks =
+        new Tracks(
+            ImmutableList.of(
+                new Tracks.Group(
+                    new TrackGroup(
+                        new Format.Builder().setMetadata(new Metadata()).setId("2").build()),
+                    /* adaptiveSupported= */ true,
+                    /* trackSupport= */ new int[] {C.FORMAT_HANDLED},
+                    /* trackSelected= */ new boolean[] {true}),
+                new Tracks.Group(
+                    new TrackGroup(
+                        new Format.Builder().setMetadata(new Metadata()).setId("3").build()),
+                    /* adaptiveSupported= */ false,
+                    /* trackSupport= */ new int[1],
+                    /* trackSelected= */ new boolean[1])));
+    Bundle playerConfig =
+        new RemoteMediaSession.MockPlayerConfigBuilder()
+            .setCurrentTracks(initialPlayerTracks)
+            .build();
+    remoteSession.setPlayer(playerConfig);
+    MediaController controller = controllerTestRule.createController(remoteSession.getToken());
+    CountDownLatch trackChangedEvent = new CountDownLatch(1);
+    threadTestRule
+        .getHandler()
+        .postAndSync(
+            () ->
+                controller.addListener(
+                    new Player.Listener() {
+                      @Override
+                      public void onTracksChanged(Tracks tracks) {
+                        trackChangedEvent.countDown();
+                      }
+                    }));
+
+    Tracks initialControllerTracks =
+        threadTestRule.getHandler().postAndSync(controller::getCurrentTracks);
+    // Do something unrelated first to ensure tracks are correctly kept even after multiple updates.
+    remoteSession.getMockPlayer().notifyPlaybackStateChanged(Player.STATE_READY);
+    remoteSession.getMockPlayer().notifyTracksChanged(updatedPlayerTracks);
+    trackChangedEvent.await();
+    Tracks updatedControllerTracks =
+        threadTestRule.getHandler().postAndSync(controller::getCurrentTracks);
+
+    assertThat(initialControllerTracks.getGroups()).hasSize(2);
+    assertThat(updatedControllerTracks.getGroups()).hasSize(2);
+    assertThat(initialControllerTracks.getGroups().get(1).getMediaTrackGroup())
+        .isEqualTo(updatedControllerTracks.getGroups().get(0).getMediaTrackGroup());
+  }
+
+  @Test
+  public void getCurrentTracksAndTrackOverrides_haveEqualTrackGroupsForEqualGroupsInPlayer()
+      throws Exception {
+    // Include metadata in Format to ensure the track group can't be fully bundled.
+    TrackGroup playerTrackGroupForOverride =
+        new TrackGroup(new Format.Builder().setMetadata(new Metadata()).setId("2").build());
+    Tracks playerTracks =
+        new Tracks(
+            ImmutableList.of(
+                new Tracks.Group(
+                    new TrackGroup(
+                        new Format.Builder().setMetadata(new Metadata()).setId("1").build()),
+                    /* adaptiveSupported= */ false,
+                    /* trackSupport= */ new int[1],
+                    /* trackSelected= */ new boolean[1]),
+                new Tracks.Group(
+                    playerTrackGroupForOverride,
+                    /* adaptiveSupported= */ false,
+                    /* trackSupport= */ new int[1],
+                    /* trackSelected= */ new boolean[1])));
+    TrackSelectionParameters trackSelectionParameters =
+        TrackSelectionParameters.DEFAULT_WITHOUT_CONTEXT
+            .buildUpon()
+            .addOverride(
+                new TrackSelectionOverride(playerTrackGroupForOverride, /* trackIndex= */ 0))
+            .build();
+    Bundle playerConfig =
+        new RemoteMediaSession.MockPlayerConfigBuilder()
+            .setCurrentTracks(playerTracks)
+            .setTrackSelectionParameters(trackSelectionParameters)
+            .build();
+    remoteSession.setPlayer(playerConfig);
+    MediaController controller = controllerTestRule.createController(remoteSession.getToken());
+
+    Tracks controllerTracks = threadTestRule.getHandler().postAndSync(controller::getCurrentTracks);
+    TrackSelectionParameters controllerTrackSelectionParameters =
+        threadTestRule.getHandler().postAndSync(controller::getTrackSelectionParameters);
+
+    TrackGroup controllerTrackGroup = controllerTracks.getGroups().get(1).getMediaTrackGroup();
+    assertThat(controllerTrackSelectionParameters.overrides)
+        .containsExactly(
+            controllerTrackGroup,
+            new TrackSelectionOverride(controllerTrackGroup, /* trackIndex= */ 0));
+  }
+
   @Test
   public void
       setMediaItems_setLessMediaItemsThanCurrentMediaItemIndex_masksCurrentMediaItemIndexAndStateCorrectly()

libraries/test_session_current/src/androidTest/java/androidx/media3/session/MediaControllerWithMediaSessionCompatTest.java

@@ -78,6 +78,7 @@ import androidx.test.ext.junit.runners.AndroidJUnit4;
 import androidx.test.ext.truth.os.BundleSubject;
 import androidx.test.filters.MediumTest;
 import com.google.common.collect.ImmutableList;
+import com.google.common.collect.Iterables;
 import com.google.common.collect.Range;
 import com.google.common.util.concurrent.Futures;
 import com.google.common.util.concurrent.ListenableFuture;
@@ -414,6 +415,41 @@ public class MediaControllerWithMediaSessionCompatTest {
     assertThat(timelineRef.get().getPeriodCount()).isEqualTo(0);
   }
 
+  @Test
+  public void setQueue_withDuplicatedMediaItems_updatesAndNotifiesTimeline() throws Exception {
+    MediaController controller = controllerTestRule.createController(session.getSessionToken());
+    CountDownLatch latch = new CountDownLatch(1);
+    AtomicReference<Timeline> timelineFromParamRef = new AtomicReference<>();
+    AtomicReference<Timeline> timelineFromGetterRef = new AtomicReference<>();
+    AtomicInteger reasonRef = new AtomicInteger();
+    Player.Listener listener =
+        new Player.Listener() {
+          @Override
+          public void onTimelineChanged(
+              Timeline timeline, @Player.TimelineChangeReason int reason) {
+            timelineFromParamRef.set(timeline);
+            timelineFromGetterRef.set(controller.getCurrentTimeline());
+            reasonRef.set(reason);
+            latch.countDown();
+          }
+        };
+    threadTestRule.getHandler().postAndSync(() -> controller.addListener(listener));
+
+    List<MediaItem> mediaItems = MediaTestUtils.createMediaItems(/* size= */ 2);
+    Timeline testTimeline =
+        MediaTestUtils.createTimeline(
+            ImmutableList.copyOf(Iterables.concat(mediaItems, mediaItems)));
+    List<QueueItem> testQueue =
+        MediaTestUtils.convertToQueueItemsWithoutBitmap(
+            MediaUtils.convertToMediaItemList(testTimeline));
+    session.setQueue(testQueue);
+
+    assertThat(latch.await(TIMEOUT_MS, MILLISECONDS)).isTrue();
+    MediaTestUtils.assertMediaIdEquals(testTimeline, timelineFromParamRef.get());
+    MediaTestUtils.assertMediaIdEquals(testTimeline, timelineFromGetterRef.get());
+    assertThat(reasonRef.get()).isEqualTo(Player.TIMELINE_CHANGE_REASON_PLAYLIST_CHANGED);
+  }
+
   @Test
   public void setQueue_withDescription_notifiesTimelineWithMetadata() throws Exception {
     CountDownLatch latch = new CountDownLatch(1);

libraries/test_session_current/src/androidTest/java/androidx/media3/session/MediaSessionAndControllerTest.java

@@ -24,13 +24,21 @@ import static java.util.concurrent.TimeUnit.MILLISECONDS;
 import android.content.Context;
 import android.os.Handler;
 import android.os.Looper;
+import androidx.media3.common.C;
+import androidx.media3.common.Format;
+import androidx.media3.common.Metadata;
+import androidx.media3.common.MimeTypes;
 import androidx.media3.common.Player;
+import androidx.media3.common.TrackGroup;
+import androidx.media3.common.TrackSelectionOverride;
+import androidx.media3.common.Tracks;
 import androidx.media3.common.util.Util;
 import androidx.media3.test.session.common.HandlerThreadTestRule;
 import androidx.media3.test.session.common.MainLooperTestRule;
 import androidx.test.core.app.ApplicationProvider;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
 import androidx.test.filters.LargeTest;
+import com.google.common.collect.ImmutableList;
 import com.google.common.util.concurrent.ListenableFuture;
 import java.util.concurrent.CancellationException;
 import java.util.concurrent.CountDownLatch;
@@ -248,4 +256,58 @@ public class MediaSessionAndControllerTest {
     player.awaitMethodCalled(MockPlayer.METHOD_PREPARE, TIMEOUT_MS);
     player.awaitMethodCalled(MockPlayer.METHOD_PLAY, TIMEOUT_MS);
   }
+
+  @Test
+  public void setTrackSelectionParameters_withOverrides_matchesExpectedTrackGroupInPlayer()
+      throws Exception {
+    MockPlayer player =
+        new MockPlayer.Builder().setApplicationLooper(Looper.getMainLooper()).build();
+    // Intentionally add metadata to the format as this can't be bundled.
+    Tracks.Group trackGroupInPlayer =
+        new Tracks.Group(
+            new TrackGroup(
+                new Format.Builder()
+                    .setId("0")
+                    .setSampleMimeType(MimeTypes.VIDEO_H264)
+                    .setMetadata(new Metadata())
+                    .build(),
+                new Format.Builder()
+                    .setId("1")
+                    .setSampleMimeType(MimeTypes.VIDEO_H264)
+                    .setMetadata(new Metadata())
+                    .build()),
+            /* adaptiveSupported= */ false,
+            /* trackSupport= */ new int[] {C.FORMAT_HANDLED, C.FORMAT_HANDLED},
+            /* trackSelected= */ new boolean[] {true, false});
+    player.currentTracks = new Tracks(ImmutableList.of(trackGroupInPlayer));
+    MediaSession session =
+        sessionTestRule.ensureReleaseAfterTest(
+            new MediaSession.Builder(context, player).setId(TAG).build());
+    MediaController controller = controllerTestRule.createController(session.getToken());
+
+    threadTestRule
+        .getHandler()
+        .postAndSync(
+            () ->
+                controller.setTrackSelectionParameters(
+                    controller
+                        .getTrackSelectionParameters()
+                        .buildUpon()
+                        .setOverrideForType(
+                            new TrackSelectionOverride(
+                                controller
+                                    .getCurrentTracks()
+                                    .getGroups()
+                                    .get(0)
+                                    .getMediaTrackGroup(),
+                                /* trackIndex= */ 1))
+                        .build()));
+    player.awaitMethodCalled(MockPlayer.METHOD_SET_TRACK_SELECTION_PARAMETERS, TIMEOUT_MS);
+
+    assertThat(player.trackSelectionParameters.overrides)
+        .containsExactly(
+            trackGroupInPlayer.getMediaTrackGroup(),
+            new TrackSelectionOverride(
+                trackGroupInPlayer.getMediaTrackGroup(), /* trackIndex= */ 1));
+  }
 }

libraries/test_session_current/src/main/java/androidx/media3/session/MediaSessionProviderService.java

@@ -18,6 +18,7 @@ package androidx.media3.session;
 import static androidx.media3.common.Player.COMMAND_GET_TRACKS;
 import static androidx.media3.test.session.common.CommonConstants.ACTION_MEDIA3_SESSION;
 import static androidx.media3.test.session.common.CommonConstants.KEY_AUDIO_ATTRIBUTES;
+import static androidx.media3.test.session.common.CommonConstants.KEY_AVAILABLE_COMMANDS;
 import static androidx.media3.test.session.common.CommonConstants.KEY_BUFFERED_PERCENTAGE;
 import static androidx.media3.test.session.common.CommonConstants.KEY_BUFFERED_POSITION;
 import static androidx.media3.test.session.common.CommonConstants.KEY_CONTENT_BUFFERED_POSITION;
@@ -397,6 +398,10 @@ public class MediaSessionProviderService extends Service {
         player.trackSelectionParameters =
             TrackSelectionParameters.fromBundle(trackSelectionParametersBundle);
       }
+      @Nullable Bundle availableCommandsBundle = config.getBundle(KEY_AVAILABLE_COMMANDS);
+      if (availableCommandsBundle != null) {
+        player.commands = Player.Commands.CREATOR.fromBundle(availableCommandsBundle);
+      }
       return player;
     }
 

libraries/test_session_current/src/main/java/androidx/media3/session/RemoteMediaSession.java

@@ -17,6 +17,7 @@ package androidx.media3.session;
 
 import static androidx.media3.test.session.common.CommonConstants.ACTION_MEDIA3_SESSION;
 import static androidx.media3.test.session.common.CommonConstants.KEY_AUDIO_ATTRIBUTES;
+import static androidx.media3.test.session.common.CommonConstants.KEY_AVAILABLE_COMMANDS;
 import static androidx.media3.test.session.common.CommonConstants.KEY_BUFFERED_PERCENTAGE;
 import static androidx.media3.test.session.common.CommonConstants.KEY_BUFFERED_POSITION;
 import static androidx.media3.test.session.common.CommonConstants.KEY_CONTENT_BUFFERED_POSITION;
@@ -742,6 +743,12 @@ public class RemoteMediaSession {
       return this;
     }
 
+    @CanIgnoreReturnValue
+    public MockPlayerConfigBuilder setAvailableCommands(Player.Commands availableCommands) {
+      bundle.putBundle(KEY_AVAILABLE_COMMANDS, availableCommands.toBundle());
+      return this;
+    }
+
     public Bundle build() {
       return bundle;
     }

libraries/test_utils/build.gradle

@@ -20,6 +20,7 @@ dependencies {
     api 'androidx.test.ext:truth:' + androidxTestTruthVersion
     api 'junit:junit:' + junitVersion
     api 'com.google.truth:truth:' + truthVersion
+    api 'com.google.truth.extensions:truth-java8-extension:' + truthVersion
     compileOnly 'org.checkerframework:checker-qual:' + checkerframeworkVersion
     compileOnly 'org.checkerframework:checker-compat-qual:' + checkerframeworkCompatVersion
     compileOnly 'org.jetbrains.kotlin:kotlin-annotations-jvm:' + kotlinAnnotationsVersion

missing_aar_type_workaround.gradle

@@ -24,6 +24,7 @@ def addMissingAarTypeToXml(xml) {
         "com.google.ads.interactivemedia.v3:interactivemedia",
         "com.google.guava:guava",
         "com.google.truth:truth",
+        "com.google.truth.extensions:truth-java8-extension",
         "com.squareup.okhttp3:okhttp",
         "com.squareup.okhttp3:mockwebserver",
         "org.mockito:mockito-core",
@@ -77,6 +78,11 @@ def addMissingAarTypeToXml(xml) {
                         (isProjectLibrary
                             || aar_dependencies.contains(dependencyName))
                     if (!hasJar && !hasAar) {
+                        // To look for what kind of dependency it is i.e. aar or jar type,
+                        // please expand the External Libraries in Project view in Android Studio
+                        // and search for your dependency inside Gradle Script dependencies.
+                        // .aar files have @aar suffix at the end of their name,
+                        // while .jar files have nothing.
                         throw new IllegalStateException(
                             dependencyName + " is not on the JAR or AAR list in missing_aar_type_workaround.gradle")
                     }