Report unexpected discontinuity as non-fatal audio sink error.

This is preferable to just logging to LogCat so that listeners can
report this to analytics systems if required.

Issue: #6384
PiperOrigin-RevId: 357906079

RELEASENOTES.md

@@ -9,6 +9,9 @@
 *   Audio:
     *   Fix `SimpleExoPlayer` reporting audio session ID as 0 in some cases
         ([#8585](https://github.com/google/ExoPlayer/issues/8585)).
+    *   Report unexpected discontinuities in
+        `AnalyticsListener.onAudioSinkError`
+        ([#6384](https://github.com/google/ExoPlayer/issues/6384)).
 *   Analytics:
     *   Add `onAudioCodecError` and `onVideoCodecError` to `AnalyticsListener`.
 *   Library restructuring:

library/core/src/main/java/com/google/android/exoplayer2/analytics/AnalyticsListener.java

@@ -854,8 +854,9 @@ public interface AnalyticsListener {
    * wishes to do so.
    *
    * @param eventTime The event time.
-   * @param audioSinkError Either a {@link AudioSink.InitializationException} or a {@link
-   *     AudioSink.WriteException} describing the error.
+   * @param audioSinkError The error that occurred. Typically an {@link
+   *     AudioSink.InitializationException}, a {@link AudioSink.WriteException}, or an {@link
+   *     AudioSink.UnexpectedDiscontinuityException}.
    */
   default void onAudioSinkError(EventTime eventTime, Exception audioSinkError) {}
 

library/core/src/main/java/com/google/android/exoplayer2/audio/AudioRendererEventListener.java

@@ -144,7 +144,8 @@ public interface AudioRendererEventListener {
    * wishes to do so.
    *
    * @param audioSinkError The error that occurred. Typically an {@link
-   *     AudioSink.InitializationException} or a {@link AudioSink.WriteException}.
+   *     AudioSink.InitializationException}, a {@link AudioSink.WriteException}, or an {@link
+   *     AudioSink.UnexpectedDiscontinuityException}.
    */
   default void onAudioSinkError(Exception audioSinkError) {}
 

library/core/src/main/java/com/google/android/exoplayer2/audio/AudioSink.java

@@ -126,8 +126,8 @@ public interface AudioSink {
      * <p>Fatal errors that cannot be recovered will be reported wrapped in a {@link
      * ExoPlaybackException} by {@link Player.EventListener#onPlayerError(ExoPlaybackException)}.
      *
-     * @param audioSinkError Either an {@link AudioSink.InitializationException} or a {@link
-     *     AudioSink.WriteException} describing the error.
+     * @param audioSinkError The error that occurred. Typically an {@link InitializationException},
+     *     a {@link WriteException}, or an {@link UnexpectedDiscontinuityException}.
      */
     default void onAudioSinkError(Exception audioSinkError) {}
   }
@@ -226,6 +226,27 @@ public interface AudioSink {
 
   }
 
+  /** Thrown when the sink encounters an unexpected timestamp discontinuity. */
+  final class UnexpectedDiscontinuityException extends Exception {
+    /** The actual presentation time of a sample, in microseconds. */
+    public final long actualPresentationTimeUs;
+    /** The expected presentation time of a sample, in microseconds. */
+    public final long expectedPresentationTimeUs;
+
+    /**
+     * Creates an instance.
+     *
+     * @param actualPresentationTimeUs The actual presentation time of a sample, in microseconds.
+     * @param expectedPresentationTimeUs The expected presentation time of a sample, in
+     *     microseconds.
+     */
+    public UnexpectedDiscontinuityException(
+        long actualPresentationTimeUs, long expectedPresentationTimeUs) {
+      this.actualPresentationTimeUs = actualPresentationTimeUs;
+      this.expectedPresentationTimeUs = expectedPresentationTimeUs;
+    }
+  }
+
   /**
    * The level of support the sink provides for a format. One of {@link
    * #SINK_FORMAT_SUPPORTED_DIRECTLY}, {@link #SINK_FORMAT_SUPPORTED_WITH_TRANSCODING} or {@link

library/core/src/main/java/com/google/android/exoplayer2/audio/DefaultAudioSink.java

@@ -762,13 +762,9 @@ public final class DefaultAudioSink implements AudioSink {
                   getSubmittedFrames() - trimmingAudioProcessor.getTrimmedFrameCount());
       if (!startMediaTimeUsNeedsSync
           && Math.abs(expectedPresentationTimeUs - presentationTimeUs) > 200000) {
-        Log.e(
-            TAG,
-            "Discontinuity detected [expected "
-                + expectedPresentationTimeUs
-                + ", got "
-                + presentationTimeUs
-                + "]");
+        listener.onAudioSinkError(
+            new AudioSink.UnexpectedDiscontinuityException(
+                presentationTimeUs, expectedPresentationTimeUs));
         startMediaTimeUsNeedsSync = true;
       }
       if (startMediaTimeUsNeedsSync) {