Add timestamp to `CueGroup`

`TextRenderer` is updated to output `CueGroup`, which contains the presentation time of the cues, in microseconds.

PiperOrigin-RevId: 456531399

libraries/cast/src/main/java/androidx/media3/cast/CastPlayer.java

@@ -113,6 +113,8 @@ public final class CastPlayer extends BasePlayer {
 
   private static final long PROGRESS_REPORT_PERIOD_MS = 1000;
   private static final long[] EMPTY_TRACK_ID_ARRAY = new long[0];
+  private static final CueGroup EMPTY_CUE_GROUP =
+      new CueGroup(ImmutableList.of(), /* presentationTimeUs= */ 0);
 
   private final CastContext castContext;
   private final MediaItemConverter mediaItemConverter;
@@ -714,7 +716,7 @@ public final class CastPlayer extends BasePlayer {
   /** This method is not supported and returns an empty {@link CueGroup}. */
   @Override
   public CueGroup getCurrentCues() {
-    return CueGroup.EMPTY;
+    return EMPTY_CUE_GROUP;
   }
 
   /** This method is not supported and always returns {@link DeviceInfo#UNKNOWN}. */

libraries/common/src/main/java/androidx/media3/common/text/CueGroup.java

@@ -22,6 +22,7 @@ import android.os.Bundle;
 import androidx.annotation.IntDef;
 import androidx.annotation.Nullable;
 import androidx.media3.common.Bundleable;
+import androidx.media3.common.Timeline;
 import androidx.media3.common.util.BundleableUtil;
 import androidx.media3.common.util.UnstableApi;
 import com.google.common.collect.ImmutableList;
@@ -34,10 +35,6 @@ import java.util.List;
 
 /** Class to represent the state of active {@link Cue Cues} at a particular time. */
 public final class CueGroup implements Bundleable {
-
-  /** Empty {@link CueGroup}. */
-  @UnstableApi public static final CueGroup EMPTY = new CueGroup(ImmutableList.of());
-
   /**
    * The cues in this group.
    *
@@ -47,11 +44,18 @@ public final class CueGroup implements Bundleable {
    * <p>This list may be empty if the group represents a state with no cues.
    */
   public final ImmutableList<Cue> cues;
+  /**
+   * The presentation time of the {@link #cues}, in microseconds.
+   *
+   * <p>This time is an offset from the start of the current {@link Timeline.Period}
+   */
+  @UnstableApi public final long presentationTimeUs;
 
   /** Creates a CueGroup. */
   @UnstableApi
-  public CueGroup(List<Cue> cues) {
+  public CueGroup(List<Cue> cues, long presentationTimeUs) {
     this.cues = ImmutableList.copyOf(cues);
+    this.presentationTimeUs = presentationTimeUs;
   }
 
   // Bundleable implementation.
@@ -59,10 +63,11 @@ public final class CueGroup implements Bundleable {
   @Documented
   @Retention(RetentionPolicy.SOURCE)
   @Target(TYPE_USE)
-  @IntDef({FIELD_CUES})
+  @IntDef({FIELD_CUES, FIELD_PRESENTATION_TIME_US})
   private @interface FieldNumber {}
 
   private static final int FIELD_CUES = 0;
+  private static final int FIELD_PRESENTATION_TIME_US = 1;
 
   @UnstableApi
   @Override
@@ -70,6 +75,7 @@ public final class CueGroup implements Bundleable {
     Bundle bundle = new Bundle();
     bundle.putParcelableArrayList(
         keyForField(FIELD_CUES), BundleableUtil.toBundleArrayList(filterOutBitmapCues(cues)));
+    bundle.putLong(keyForField(FIELD_PRESENTATION_TIME_US), presentationTimeUs);
     return bundle;
   }
 
@@ -81,7 +87,8 @@ public final class CueGroup implements Bundleable {
         cueBundles == null
             ? ImmutableList.of()
             : BundleableUtil.fromBundleList(Cue.CREATOR, cueBundles);
-    return new CueGroup(cues);
+    long presentationTimeUs = bundle.getLong(keyForField(FIELD_PRESENTATION_TIME_US));
+    return new CueGroup(cues, presentationTimeUs);
   }
 
   private static String keyForField(@FieldNumber int field) {

libraries/common/src/test/java/androidx/media3/common/text/CueGroupTest.java

@@ -37,7 +37,7 @@ public class CueGroupTest {
     Cue bitmapCue =
         new Cue.Builder().setBitmap(Bitmap.createBitmap(1, 1, Bitmap.Config.ARGB_8888)).build();
     ImmutableList<Cue> cues = ImmutableList.of(textCue, bitmapCue);
-    CueGroup cueGroup = new CueGroup(cues);
+    CueGroup cueGroup = new CueGroup(cues, /* presentationTimeUs= */ 1_230_000);
 
     Parcel parcel = Parcel.obtain();
     try {

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

@@ -355,7 +355,7 @@ import java.util.concurrent.TimeoutException;
       } else {
         audioSessionId = Util.generateAudioSessionIdV21(applicationContext);
       }
-      currentCueGroup = CueGroup.EMPTY;
+      currentCueGroup = new CueGroup(ImmutableList.of(), /* presentationTimeUs= */ 0);
       throwsWhenUsingWrongThread = true;
 
       addListener(analyticsCollector);
@@ -939,7 +939,7 @@ import java.util.concurrent.TimeoutException;
     verifyApplicationThread();
     audioFocusManager.updateAudioFocus(getPlayWhenReady(), Player.STATE_IDLE);
     stopInternal(reset, /* error= */ null);
-    currentCueGroup = CueGroup.EMPTY;
+    currentCueGroup = new CueGroup(ImmutableList.of(), playbackInfo.positionUs);
   }
 
   @Override
@@ -993,7 +993,7 @@ import java.util.concurrent.TimeoutException;
       checkNotNull(priorityTaskManager).remove(C.PRIORITY_PLAYBACK);
       isPriorityTaskManagerRegistered = false;
     }
-    currentCueGroup = CueGroup.EMPTY;
+    currentCueGroup = new CueGroup(ImmutableList.of(), /* presentationTimeUs= */ 0);
     playerReleased = true;
   }
 

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/text/TextRenderer.java

@@ -42,12 +42,13 @@ import androidx.media3.extractor.text.SubtitleDecoder;
 import androidx.media3.extractor.text.SubtitleDecoderException;
 import androidx.media3.extractor.text.SubtitleInputBuffer;
 import androidx.media3.extractor.text.SubtitleOutputBuffer;
+import com.google.common.collect.ImmutableList;
 import java.lang.annotation.Documented;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
-import java.util.Collections;
-import java.util.List;
+import org.checkerframework.checker.nullness.qual.RequiresNonNull;
+import org.checkerframework.dataflow.qual.SideEffectFree;
 
 /**
  * A renderer for text.
@@ -103,6 +104,8 @@ public final class TextRenderer extends BaseRenderer implements Callback {
   @Nullable private SubtitleOutputBuffer nextSubtitle;
   private int nextSubtitleEventIndex;
   private long finalStreamEndPositionUs;
+  private long outputStreamOffsetUs;
+  private long lastRendererPositionUs;
 
   /**
    * @param output The output.
@@ -134,6 +137,8 @@ public final class TextRenderer extends BaseRenderer implements Callback {
     this.decoderFactory = decoderFactory;
     formatHolder = new FormatHolder();
     finalStreamEndPositionUs = C.TIME_UNSET;
+    outputStreamOffsetUs = C.TIME_UNSET;
+    lastRendererPositionUs = C.TIME_UNSET;
   }
 
   @Override
@@ -170,6 +175,7 @@ public final class TextRenderer extends BaseRenderer implements Callback {
 
   @Override
   protected void onStreamChanged(Format[] formats, long startPositionUs, long offsetUs) {
+    outputStreamOffsetUs = offsetUs;
     streamFormat = formats[0];
     if (decoder != null) {
       decoderReplacementState = REPLACEMENT_STATE_SIGNAL_END_OF_STREAM;
@@ -180,6 +186,7 @@ public final class TextRenderer extends BaseRenderer implements Callback {
 
   @Override
   protected void onPositionReset(long positionUs, boolean joining) {
+    lastRendererPositionUs = positionUs;
     clearOutput();
     inputStreamEnded = false;
     outputStreamEnded = false;
@@ -194,6 +201,7 @@ public final class TextRenderer extends BaseRenderer implements Callback {
 
   @Override
   public void render(long positionUs, long elapsedRealtimeUs) {
+    lastRendererPositionUs = positionUs;
     if (isCurrentStreamFinal()
         && finalStreamEndPositionUs != C.TIME_UNSET
         && positionUs >= finalStreamEndPositionUs) {
@@ -257,7 +265,9 @@ public final class TextRenderer extends BaseRenderer implements Callback {
       // If textRendererNeedsUpdate then subtitle must be non-null.
       checkNotNull(subtitle);
       // textRendererNeedsUpdate is set and we're playing. Update the renderer.
-      updateOutput(subtitle.getCues(positionUs));
+      long presentationTimeUs = getPresentationTimeUs(getCurrentEventTimeUs(positionUs));
+      CueGroup cueGroup = new CueGroup(subtitle.getCues(positionUs), presentationTimeUs);
+      updateOutput(cueGroup);
     }
 
     if (decoderReplacementState == REPLACEMENT_STATE_WAIT_END_OF_STREAM) {
@@ -315,6 +325,8 @@ public final class TextRenderer extends BaseRenderer implements Callback {
     streamFormat = null;
     finalStreamEndPositionUs = C.TIME_UNSET;
     clearOutput();
+    outputStreamOffsetUs = C.TIME_UNSET;
+    lastRendererPositionUs = C.TIME_UNSET;
     releaseDecoder();
   }
 
@@ -370,33 +382,33 @@ public final class TextRenderer extends BaseRenderer implements Callback {
         : subtitle.getEventTime(nextSubtitleEventIndex);
   }
 
-  private void updateOutput(List<Cue> cues) {
+  private void updateOutput(CueGroup cueGroup) {
     if (outputHandler != null) {
-      outputHandler.obtainMessage(MSG_UPDATE_OUTPUT, cues).sendToTarget();
+      outputHandler.obtainMessage(MSG_UPDATE_OUTPUT, cueGroup).sendToTarget();
     } else {
-      invokeUpdateOutputInternal(cues);
+      invokeUpdateOutputInternal(cueGroup);
     }
   }
 
   private void clearOutput() {
-    updateOutput(Collections.emptyList());
+    updateOutput(new CueGroup(ImmutableList.of(), getPresentationTimeUs(lastRendererPositionUs)));
   }
 
-  @SuppressWarnings("unchecked")
   @Override
   public boolean handleMessage(Message msg) {
     switch (msg.what) {
       case MSG_UPDATE_OUTPUT:
-        invokeUpdateOutputInternal((List<Cue>) msg.obj);
+        invokeUpdateOutputInternal((CueGroup) msg.obj);
         return true;
       default:
         throw new IllegalStateException();
     }
   }
 
-  private void invokeUpdateOutputInternal(List<Cue> cues) {
-    output.onCues(cues);
-    output.onCues(new CueGroup(cues));
+  @SuppressWarnings("deprecation") // We need to call both onCues method for backward compatibility.
+  private void invokeUpdateOutputInternal(CueGroup cueGroup) {
+    output.onCues(cueGroup.cues);
+    output.onCues(cueGroup);
   }
 
   /**
@@ -410,4 +422,25 @@ public final class TextRenderer extends BaseRenderer implements Callback {
     clearOutput();
     replaceDecoder();
   }
+
+  @RequiresNonNull("subtitle")
+  @SideEffectFree
+  private long getCurrentEventTimeUs(long positionUs) {
+    int nextEventTimeIndex = subtitle.getNextEventTimeIndex(positionUs);
+    if (nextEventTimeIndex == 0) {
+      return subtitle.timeUs;
+    }
+
+    return nextEventTimeIndex == C.INDEX_UNSET
+        ? subtitle.getEventTime(subtitle.getEventTimeCount() - 1)
+        : subtitle.getEventTime(nextEventTimeIndex - 1);
+  }
+
+  @SideEffectFree
+  private long getPresentationTimeUs(long positionUs) {
+    checkState(positionUs != C.TIME_UNSET);
+    checkState(outputStreamOffsetUs != C.TIME_UNSET);
+
+    return positionUs - outputStreamOffsetUs;
+  }
 }

libraries/exoplayer/src/test/java/androidx/media3/exoplayer/e2etest/PlaylistPlaybackTest.java

@@ -16,9 +16,16 @@
 package androidx.media3.exoplayer.e2etest;
 
 import android.content.Context;
+import android.graphics.SurfaceTexture;
+import android.net.Uri;
+import android.view.Surface;
+import androidx.media3.common.C;
 import androidx.media3.common.MediaItem;
+import androidx.media3.common.MimeTypes;
 import androidx.media3.common.Player;
 import androidx.media3.exoplayer.ExoPlayer;
+import androidx.media3.exoplayer.source.DefaultMediaSourceFactory;
+import androidx.media3.exoplayer.source.MediaSource;
 import androidx.media3.test.utils.CapturingRenderersFactory;
 import androidx.media3.test.utils.DumpFileAsserts;
 import androidx.media3.test.utils.FakeClock;
@@ -27,6 +34,7 @@ import androidx.media3.test.utils.robolectric.ShadowMediaCodecConfig;
 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 org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -82,4 +90,43 @@ public final class PlaylistPlaybackTest {
     DumpFileAsserts.assertOutput(
         applicationContext, playbackOutput, "playbackdumps/playlists/bypass-off-then-on.dump");
   }
+
+  @Test
+  public void test_subtitle() throws Exception {
+    Context applicationContext = ApplicationProvider.getApplicationContext();
+    CapturingRenderersFactory capturingRenderersFactory =
+        new CapturingRenderersFactory(applicationContext);
+    MediaSource.Factory mediaSourceFactory =
+        new DefaultMediaSourceFactory(applicationContext)
+            .experimentalUseProgressiveMediaSourceForSubtitles(true);
+    ExoPlayer player =
+        new ExoPlayer.Builder(applicationContext, capturingRenderersFactory)
+            .setClock(new FakeClock(/* isAutoAdvancing= */ true))
+            .setMediaSourceFactory(mediaSourceFactory)
+            .build();
+    player.setVideoSurface(new Surface(new SurfaceTexture(/* texName= */ 1)));
+    PlaybackOutput playbackOutput = PlaybackOutput.register(player, capturingRenderersFactory);
+
+    player.addMediaItem(MediaItem.fromUri("asset:///media/mp4/preroll-5s.mp4"));
+    MediaItem mediaItemWithSubtitle =
+        new MediaItem.Builder()
+            .setUri("asset:///media/mp4/preroll-5s.mp4")
+            .setSubtitleConfigurations(
+                ImmutableList.of(
+                    new MediaItem.SubtitleConfiguration.Builder(
+                            Uri.parse("asset:///media/webvtt/typical"))
+                        .setMimeType(MimeTypes.TEXT_VTT)
+                        .setLanguage("en")
+                        .setSelectionFlags(C.SELECTION_FLAG_DEFAULT)
+                        .build()))
+            .build();
+    player.addMediaItem(mediaItemWithSubtitle);
+    player.prepare();
+    player.play();
+    TestPlayerRunHelper.runUntilPlaybackState(player, Player.STATE_ENDED);
+    player.release();
+
+    DumpFileAsserts.assertOutput(
+        applicationContext, playbackOutput, "playbackdumps/playlists/playlist_with_subtitles.dump");
+  }
 }

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

@@ -56,6 +56,7 @@ import androidx.media3.common.util.Consumer;
 import androidx.media3.common.util.Log;
 import androidx.media3.common.util.UnstableApi;
 import androidx.media3.common.util.Util;
+import com.google.common.collect.ImmutableList;
 import com.google.common.util.concurrent.Futures;
 import com.google.common.util.concurrent.ListenableFuture;
 import java.util.List;
@@ -164,6 +165,9 @@ public class MediaController implements Player {
       "MediaController method is called from a wrong thread."
           + " See javadoc of MediaController for details.";
 
+  private static final CueGroup EMPTY_CUE_GROUP =
+      new CueGroup(ImmutableList.of(), /* presentationTimeUs= */ 0);
+
   /** A builder for {@link MediaController}. */
   public static final class Builder {
 
@@ -1576,7 +1580,7 @@ public class MediaController implements Player {
   @Override
   public CueGroup getCurrentCues() {
     verifyApplicationThread();
-    return isConnected() ? impl.getCurrentCues() : CueGroup.EMPTY;
+    return isConnected() ? impl.getCurrentCues() : EMPTY_CUE_GROUP;
   }
 
   @Override

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

@@ -105,6 +105,8 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
 
   private static final long AGGREGATES_CALLBACKS_WITHIN_TIMEOUT_MS = 500L;
   private static final int VOLUME_FLAGS = AudioManager.FLAG_SHOW_UI;
+  private static final CueGroup EMPTY_CUE_GROUP =
+      new CueGroup(ImmutableList.of(), /* presentationTimeUs= */ 0);
 
   /* package */ final Context context;
   /* package */ final MediaController instance;
@@ -1016,7 +1018,7 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
   @Override
   public CueGroup getCurrentCues() {
     Log.w(TAG, "Session doesn't support getting Cue");
-    return CueGroup.EMPTY;
+    return EMPTY_CUE_GROUP;
   }
 
   @Override
@@ -2086,7 +2088,7 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
             /* playlistMetadata= */ playlistMetadata,
             /* volume= */ 1.0f,
             /* audioAttributes= */ audioAttributes,
-            /* cueGroup= */ CueGroup.EMPTY,
+            /* cueGroup= */ EMPTY_CUE_GROUP,
             /* deviceInfo= */ deviceInfo,
             /* deviceVolume= */ deviceVolume,
             /* deviceMuted= */ deviceMuted,

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

@@ -45,6 +45,7 @@ import androidx.media3.common.TrackSelectionParameters;
 import androidx.media3.common.VideoSize;
 import androidx.media3.common.text.CueGroup;
 import androidx.media3.common.util.Assertions;
+import com.google.common.collect.ImmutableList;
 import java.lang.annotation.Documented;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
@@ -56,6 +57,9 @@ import java.lang.annotation.Target;
  */
 /* package */ class PlayerInfo implements Bundleable {
 
+  private static final CueGroup EMPTY_CUE_GROUP =
+      new CueGroup(ImmutableList.of(), /* presentationTimeUs= */ 0);
+
   public static class Builder {
 
     @Nullable private PlaybackException playerError;
@@ -332,7 +336,7 @@ import java.lang.annotation.Target;
           MediaMetadata.EMPTY,
           /* volume= */ 1f,
           AudioAttributes.DEFAULT,
-          /* cueGroup = */ CueGroup.EMPTY,
+          /* cueGroup = */ EMPTY_CUE_GROUP,
           DeviceInfo.UNKNOWN,
           /* deviceVolume= */ 0,
           /* deviceMuted= */ false,
@@ -846,7 +850,7 @@ import java.lang.annotation.Target;
             : AudioAttributes.CREATOR.fromBundle(audioAttributesBundle);
     @Nullable Bundle cueGroupBundle = bundle.getBundle(keyForField(FIELD_CUE_GROUP));
     CueGroup cueGroup =
-        cueGroupBundle == null ? CueGroup.EMPTY : CueGroup.CREATOR.fromBundle(cueGroupBundle);
+        cueGroupBundle == null ? EMPTY_CUE_GROUP : CueGroup.CREATOR.fromBundle(cueGroupBundle);
     @Nullable Bundle deviceInfoBundle = bundle.getBundle(keyForField(FIELD_DEVICE_INFO));
     DeviceInfo deviceInfo =
         deviceInfoBundle == null

libraries/test_data/src/test/assets/playbackdumps/playlists/playlist_with_subtitles.dump

+MediaCodecAdapter (exotest.audio.aac):
+  buffers.length = 436
+  buffers[0] = length 21, hash D57A2CCC
+  buffers[1] = length 4, hash EE9DF
+  buffers[2] = length 4, hash EE9DF
+  buffers[3] = length 4, hash EE9DF
+  buffers[4] = length 4, hash EE9DF
+  buffers[5] = length 4, hash EE9DF
+  buffers[6] = length 4, hash EE9DF
+  buffers[7] = length 4, hash EE9DF
+  buffers[8] = length 4, hash EE9DF
+  buffers[9] = length 4, hash EE9DF
+  buffers[10] = length 4, hash EE9DF
+  buffers[11] = length 4, hash EE9DF
+  buffers[12] = length 4, hash EE9DF
+  buffers[13] = length 4, hash EE9DF
+  buffers[14] = length 4, hash EE9DF
+  buffers[15] = length 4, hash EE9DF
+  buffers[16] = length 4, hash EE9DF
+  buffers[17] = length 4, hash EE9DF
+  buffers[18] = length 4, hash EE9DF
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+  buffers[20] = length 4, hash EE9DF
+  buffers[21] = length 4, hash EE9DF
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+  buffers[30] = length 4, hash EE9DF
+  buffers[31] = length 4, hash EE9DF
+  buffers[32] = length 4, hash EE9DF
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+  buffers[34] = length 4, hash EE9DF
+  buffers[35] = length 4, hash EE9DF
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+  buffers[37] = length 4, hash EE9DF
+  buffers[38] = length 4, hash EE9DF
+  buffers[39] = length 4, hash EE9DF
+  buffers[40] = length 4, hash EE9DF
+  buffers[41] = length 4, hash EE9DF
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+  buffers[60] = length 4, hash EE9DF
+  buffers[61] = length 4, hash EE9DF
+  buffers[62] = length 4, hash EE9DF
+  buffers[63] = length 4, hash EE9DF
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+  buffers[73] = length 4, hash EE9DF
+  buffers[74] = length 4, hash EE9DF
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+  buffers[124] = length 4, hash EE9DF
+  buffers[125] = length 4, hash EE9DF
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+  buffers[127] = length 4, hash EE9DF
+  buffers[128] = length 4, hash EE9DF
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+  buffers[217] = length 0, hash 1
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+  buffers[435] = length 0, hash 1
+MediaCodecAdapter (exotest.video.avc):
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+  buffers[0] = length 5245, hash C090A41E
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+  buffers[149] = length 18, hash 79758B06
+  buffers[150] = length 28, hash F72EB1A3
+  buffers[151] = length 22, hash 9B881C48
+  buffers[152] = length 18, hash 4631290E
+  buffers[153] = length 18, hash 84A57842
+  buffers[154] = length 28, hash E1FCF000
+  buffers[155] = length 22, hash 359D2D82
+  buffers[156] = length 18, hash 62DE0FC9
+  buffers[157] = length 18, hash A1525EFD
+  buffers[158] = length 28, hash 5350E8FA
+  buffers[159] = length 22, hash EE2060DF
+  buffers[160] = length 18, hash 77D95125
+  buffers[161] = length 18, hash B64DA059
+  buffers[162] = length 28, hash ED67B37
+  buffers[163] = length 22, hash 4701711B
+  buffers[164] = length 18, hash D163DF61
+  buffers[165] = length 18, hash FD82E95
+  buffers[166] = length 28, hash 44A16E72
+  buffers[167] = length 22, hash 31C06057
+  buffers[168] = length 18, hash DC93CC9D
+  buffers[169] = length 18, hash 1B081BD1
+  buffers[170] = length 28, hash 2700AF
+  buffers[171] = length 22, hash 6D292D94
+  buffers[172] = length 18, hash D646C05A
+  buffers[173] = length 18, hash 14BB0F8E
+  buffers[174] = length 28, hash 5DE2C2B
+  buffers[175] = length 22, hash 57E81CD0
+  buffers[176] = length 18, hash E176AD96
+  buffers[177] = length 18, hash 1FEAFCCA
+  buffers[178] = length 28, hash C163BE68
+  buffers[179] = length 22, hash B0C92D0B
+  buffers[180] = length 18, hash 3B013BD2
+  buffers[181] = length 18, hash 79758B06
+  buffers[182] = length 28, hash F72EB1A3
+  buffers[183] = length 22, hash 9B881C48
+  buffers[184] = length 18, hash 4631290E
+  buffers[185] = length 18, hash 84A57842
+  buffers[186] = length 28, hash E1FCF000
+  buffers[187] = length 22, hash 359D2D82
+  buffers[188] = length 18, hash 62DE0FC9
+  buffers[189] = length 18, hash A1525EFD
+  buffers[190] = length 28, hash 5350E8FA
+  buffers[191] = length 22, hash EE2060DF
+  buffers[192] = length 18, hash 77D95125
+  buffers[193] = length 18, hash B64DA059
+  buffers[194] = length 28, hash ED67B37
+  buffers[195] = length 22, hash 4701711B
+  buffers[196] = length 18, hash D163DF61
+  buffers[197] = length 18, hash FD82E95
+  buffers[198] = length 28, hash 44A16E72
+  buffers[199] = length 22, hash 31C06057
+  buffers[200] = length 18, hash DC93CC9D
+  buffers[201] = length 18, hash 1B081BD1
+  buffers[202] = length 28, hash 2700AF
+  buffers[203] = length 22, hash 6D292D94
+  buffers[204] = length 18, hash D646C05A
+  buffers[205] = length 18, hash 14BB0F8E
+  buffers[206] = length 28, hash 5DE2C2B
+  buffers[207] = length 22, hash 57E81CD0
+  buffers[208] = length 18, hash E176AD96
+  buffers[209] = length 18, hash 1FEAFCCA
+  buffers[210] = length 28, hash C163BE68
+  buffers[211] = length 22, hash B0C92D0B
+  buffers[212] = length 18, hash 3B013BD2
+  buffers[213] = length 18, hash 79758B06
+  buffers[214] = length 28, hash F72EB1A3
+  buffers[215] = length 22, hash 9B881C48
+  buffers[216] = length 18, hash 4631290E
+  buffers[217] = length 18, hash 84A57842
+  buffers[218] = length 33, hash AF5CF49E
+  buffers[219] = length 22, hash 359D2D82
+  buffers[220] = length 18, hash 62DE0FC9
+  buffers[221] = length 18, hash A1525EFD
+  buffers[222] = length 33, hash F4C6DE46
+  buffers[223] = length 22, hash EE2060DF
+  buffers[224] = length 18, hash 77D95125
+  buffers[225] = length 18, hash B64DA059
+  buffers[226] = length 28, hash ED67B37
+  buffers[227] = length 22, hash 4701711B
+  buffers[228] = length 18, hash D163DF61
+  buffers[229] = length 18, hash FD82E95
+  buffers[230] = length 28, hash 44A16E72
+  buffers[231] = length 22, hash 31C06057
+  buffers[232] = length 18, hash DC93CC9D
+  buffers[233] = length 18, hash 1B081BD1
+  buffers[234] = length 28, hash 2700AF
+  buffers[235] = length 22, hash 6D292D94
+  buffers[236] = length 18, hash D646C05A
+  buffers[237] = length 18, hash 14BB0F8E
+  buffers[238] = length 27, hash 5292D9E
+  buffers[239] = length 22, hash 57E81CD0
+  buffers[240] = length 18, hash E176AD96
+  buffers[241] = length 18, hash 1FEAFCCA
+  buffers[242] = length 26, hash B0CAA4C9
+  buffers[243] = length 22, hash B0C92D0B
+  buffers[244] = length 18, hash 3B013BD2
+  buffers[245] = length 18, hash 79758B06
+  buffers[246] = length 26, hash C63A1445
+  buffers[247] = length 22, hash 9B881C48
+  buffers[248] = length 18, hash 4631290E
+  buffers[249] = length 18, hash 84A57842
+  buffers[250] = length 0, hash 1
+TextOutput:
+  Subtitle[0]:
+    presentationTimeUs = 0
+    Cues = []
+  Subtitle[1]:
+    presentationTimeUs = 0
+    Cue[0]:
+      text = This is the first subtitle.
+      textAlignment = ALIGN_CENTER
+      line = -1.0
+      lineType = 1
+      lineAnchor = 0
+      position = 0.5
+      positionAnchor = 1
+      size = 1.0
+  Subtitle[2]:
+    presentationTimeUs = 1234000
+    Cues = []
+  Subtitle[3]:
+    presentationTimeUs = 2345000
+    Cue[0]:
+      text = This is the second subtitle.
+      textAlignment = ALIGN_CENTER
+      line = -1.0
+      lineType = 1
+      lineAnchor = 0
+      position = 0.5
+      positionAnchor = 1
+      size = 1.0
+  Subtitle[4]:
+    presentationTimeUs = 3456000
+    Cues = []

libraries/test_data/src/test/assets/playbackdumps/webvtt/typical.dump

@@ -348,8 +348,10 @@ MediaCodecAdapter (exotest.video.avc):
   buffers[125] = length 0, hash 1
 TextOutput:
   Subtitle[0]:
+    presentationTimeUs = 0
     Cues = []
   Subtitle[1]:
+    presentationTimeUs = 0
     Cue[0]:
       text = This is the first subtitle.
       textAlignment = ALIGN_CENTER
@@ -360,8 +362,10 @@ TextOutput:
       positionAnchor = 1
       size = 1.0
   Subtitle[2]:
+    presentationTimeUs = 1234000
     Cues = []
   Subtitle[3]:
+    presentationTimeUs = 2345000
     Cue[0]:
       text = This is the second subtitle.
       textAlignment = ALIGN_CENTER
@@ -372,4 +376,5 @@ TextOutput:
       positionAnchor = 1
       size = 1.0
   Subtitle[4]:
+    presentationTimeUs = 3456000
     Cues = []

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

@@ -1920,7 +1920,7 @@ public class MediaControllerListenerTest {
 
     Bundle playerConfig =
         new RemoteMediaSession.MockPlayerConfigBuilder()
-            .setCurrentCues(new CueGroup(testCues))
+            .setCurrentCues(new CueGroup(testCues, /* presentationTimeUs= */ 1_230_000))
             .build();
     remoteSession.setPlayer(playerConfig);
 
@@ -1938,7 +1938,7 @@ public class MediaControllerListenerTest {
 
     Bundle playerConfig =
         new RemoteMediaSession.MockPlayerConfigBuilder()
-            .setCurrentCues(new CueGroup(testCues))
+            .setCurrentCues(new CueGroup(testCues, /* presentationTimeUs= */ 1_230_000))
             .build();
     remoteSession.setPlayer(playerConfig);
 
@@ -1991,7 +1991,7 @@ public class MediaControllerListenerTest {
 
     Bundle playerConfig =
         new RemoteMediaSession.MockPlayerConfigBuilder()
-            .setCurrentCues(new CueGroup(testCues))
+            .setCurrentCues(new CueGroup(testCues, /* presentationTimeUs= */ 1_230_000))
             .build();
     remoteSession.setPlayer(playerConfig);
 
@@ -2021,7 +2021,9 @@ public class MediaControllerListenerTest {
         };
     threadTestRule.getHandler().postAndSync(() -> controller.addListener(listener));
 
-    remoteSession.getMockPlayer().notifyCuesChanged(new CueGroup(testCues));
+    remoteSession
+        .getMockPlayer()
+        .notifyCuesChanged(new CueGroup(testCues, /* presentationTimeUs= */ 1_230_000));
 
     assertThat(latch.await(TIMEOUT_MS, MILLISECONDS)).isTrue();
     assertThat(cuesFromParam).isEqualTo(testCues);

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

@@ -105,6 +105,8 @@ import java.util.concurrent.Callable;
 public class MediaSessionProviderService extends Service {
 
   private static final String TAG = "MSProviderService";
+  private static final CueGroup EMPTY_CUE_GROUP =
+      new CueGroup(ImmutableList.of(), /* presentationTimeUs= */ 0);
 
   private Map<String, MediaSession> sessionMap = new HashMap<>();
   private RemoteMediaSessionStub sessionBinder;
@@ -327,7 +329,7 @@ public class MediaSessionProviderService extends Service {
       }
       Bundle cueGroupBundle = config.getBundle(KEY_CURRENT_CUE_GROUP);
       player.cueGroup =
-          cueGroupBundle == null ? CueGroup.EMPTY : CueGroup.CREATOR.fromBundle(cueGroupBundle);
+          cueGroupBundle == null ? EMPTY_CUE_GROUP : CueGroup.CREATOR.fromBundle(cueGroupBundle);
       @Nullable Bundle deviceInfoBundle = config.getBundle(KEY_DEVICE_INFO);
       if (deviceInfoBundle != null) {
         player.deviceInfo = DeviceInfo.CREATOR.fromBundle(deviceInfoBundle);

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

@@ -196,6 +196,8 @@ public class MockPlayer implements Player {
   private final ArraySet<Listener> listeners = new ArraySet<>();
   private final ImmutableMap<@Method Integer, ConditionVariable> conditionVariables =
       createMethodConditionVariables();
+  private static final CueGroup EMPTY_CUE_GROUP =
+      new CueGroup(ImmutableList.of(), /* presentationTimeUs= */ 0);
 
   @Nullable PlaybackException playerError;
   public AudioAttributes audioAttributes;
@@ -276,7 +278,7 @@ public class MockPlayer implements Player {
     repeatMode = Player.REPEAT_MODE_OFF;
     videoSize = VideoSize.UNKNOWN;
     volume = 1.0f;
-    cueGroup = CueGroup.EMPTY;
+    cueGroup = EMPTY_CUE_GROUP;
     deviceInfo = DeviceInfo.UNKNOWN;
     seekPositionMs = C.TIME_UNSET;
     seekMediaItemIndex = C.INDEX_UNSET;

libraries/test_utils_robolectric/src/main/java/androidx/media3/test/utils/robolectric/PlaybackOutput.java

@@ -15,6 +15,8 @@
  */
 package androidx.media3.test.utils.robolectric;
 
+import static java.lang.Math.max;
+
 import android.graphics.Bitmap;
 import androidx.annotation.Nullable;
 import androidx.media3.common.Metadata;
@@ -56,7 +58,7 @@ public final class PlaybackOutput implements Dumper.Dumpable {
   private final CapturingRenderersFactory capturingRenderersFactory;
 
   private final List<Metadata> metadatas;
-  private final List<List<Cue>> subtitles;
+  private final List<CueGroup> subtitles;
   private final List<List<Cue>> subtitlesFromDeprecatedTextOutput;
 
   private PlaybackOutput(ExoPlayer player, CapturingRenderersFactory capturingRenderersFactory) {
@@ -65,8 +67,8 @@ public final class PlaybackOutput implements Dumper.Dumpable {
     metadatas = Collections.synchronizedList(new ArrayList<>());
     subtitles = Collections.synchronizedList(new ArrayList<>());
     subtitlesFromDeprecatedTextOutput = Collections.synchronizedList(new ArrayList<>());
-    // TODO: Consider passing playback position into MetadataOutput and TextOutput. Calling
-    // player.getCurrentPosition() inside onMetadata/Cues will likely be non-deterministic
+    // TODO: Consider passing playback position into MetadataOutput. Calling
+    // player.getCurrentPosition() inside onMetadata will likely be non-deterministic
     // because renderer-thread != playback-thread.
     player.addListener(
         new Player.Listener() {
@@ -82,7 +84,7 @@ public final class PlaybackOutput implements Dumper.Dumpable {
 
           @Override
           public void onCues(CueGroup cueGroup) {
-            subtitles.add(cueGroup.cues);
+            subtitles.add(cueGroup);
           }
         });
   }
@@ -154,9 +156,9 @@ public final class PlaybackOutput implements Dumper.Dumpable {
   }
 
   private void dumpSubtitles(Dumper dumper) {
-    if (!subtitles.equals(subtitlesFromDeprecatedTextOutput)) {
+    if (subtitles.size() != subtitlesFromDeprecatedTextOutput.size()) {
       throw new IllegalStateException(
-          "Expected subtitles to be equal from both implementations of onCues method.");
+          "Expected subtitles to be of equal length from both implementations of onCues method.");
     }
 
     if (subtitles.isEmpty()) {
@@ -165,7 +167,15 @@ public final class PlaybackOutput implements Dumper.Dumpable {
     dumper.startBlock("TextOutput");
     for (int i = 0; i < subtitles.size(); i++) {
       dumper.startBlock("Subtitle[" + i + "]");
-      List<Cue> subtitle = subtitles.get(i);
+      // TODO: Solving https://github.com/google/ExoPlayer/issues/9672 will allow us to remove this
+      // hack of forcing presentationTimeUs to be >= 0.
+      dumper.add("presentationTimeUs", max(0, subtitles.get(i).presentationTimeUs));
+      ImmutableList<Cue> subtitle = subtitles.get(i).cues;
+      if (!subtitle.equals(subtitlesFromDeprecatedTextOutput.get(i))) {
+        throw new IllegalStateException(
+            "Expected subtitle to be equal from both implementations of onCues method for index "
+                + i);
+      }
       if (subtitle.isEmpty()) {
         dumper.add("Cues", ImmutableList.of());
       }