[video_player_android] Avoid sending unset duration on initialization

packages/video_player/video_player_android/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 2.12.0
+
+* Fixes a [bug](https://github.com/flutter/flutter/issues/176575) where some videos report an incorrect duration when initialized without a video duration.
+
 ## 2.11.0
 
 * Adds `backBufferDurationMs` to `CreationOptions` to configure ExoPlayer `DefaultLoadControl` back buffer duration.

packages/video_player/video_player_android/android/src/main/java/io/flutter/plugins/videoplayer/ExoPlayerEventListener.java

@@ -4,16 +4,30 @@
 
 package io.flutter.plugins.videoplayer;
 
+import android.os.Handler;
+import android.os.Looper;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.media3.common.C;
 import androidx.media3.common.PlaybackException;
 import androidx.media3.common.Player;
+import androidx.media3.common.Timeline;
 import androidx.media3.common.Tracks;
 import androidx.media3.exoplayer.ExoPlayer;
 
 public abstract class ExoPlayerEventListener implements Player.Listener {
+  static final long DURATION_UNSET_INITIALIZATION_TIMEOUT_MS = 2000;
   private boolean isInitialized = false;
+  private boolean isWaitingForValidDuration = false;
+  private final Handler mainHandler = new Handler(Looper.getMainLooper());
+  private final Runnable initializationFallback =
+      () -> {
+        if (!isInitialized && isWaitingForValidDuration) {
+          isWaitingForValidDuration = false;
+          isInitialized = true;
+          sendInitialized();
+        }
+      };
   protected final ExoPlayer exoPlayer;
   protected final VideoPlayerCallbacks events;
 
@@ -51,6 +65,39 @@ public ExoPlayerEventListener(
 
   protected abstract void sendInitialized();
 
+  /** Cancels pending initialization callbacks when the player is disposed. */
+  public void dispose() {
+    isWaitingForValidDuration = false;
+    mainHandler.removeCallbacks(initializationFallback);
+  }
+
+  private boolean hasValidDuration() {
+    return exoPlayer.getDuration() != C.TIME_UNSET;
+  }
+
+  private boolean shouldWaitForValidDuration() {
+    return !exoPlayer.isCurrentMediaItemLive() && !exoPlayer.isCurrentMediaItemDynamic();
+  }
+
+  private void maybeSendInitialized() {
+    if (isInitialized) {
+      return;
+    }
+
+    if (!hasValidDuration() && shouldWaitForValidDuration()) {
+      if (!isWaitingForValidDuration) {
+        isWaitingForValidDuration = true;
+        mainHandler.postDelayed(initializationFallback, DURATION_UNSET_INITIALIZATION_TIMEOUT_MS);
+      }
+      return;
+    }
+
+    isWaitingForValidDuration = false;
+    isInitialized = true;
+    mainHandler.removeCallbacks(initializationFallback);
+    sendInitialized();
+  }
+
   @Override
   public void onPlaybackStateChanged(final int playbackState) {
     PlatformPlaybackState platformState = PlatformPlaybackState.UNKNOWN;
@@ -60,10 +107,7 @@ public void onPlaybackStateChanged(final int playbackState) {
         break;
       case Player.STATE_READY:
         platformState = PlatformPlaybackState.READY;
-        if (!isInitialized) {
-          isInitialized = true;
-          sendInitialized();
-        }
+        maybeSendInitialized();
         break;
       case Player.STATE_ENDED:
         platformState = PlatformPlaybackState.ENDED;
@@ -75,6 +119,13 @@ public void onPlaybackStateChanged(final int playbackState) {
     events.onPlaybackStateChanged(platformState);
   }
 
+  @Override
+  public void onTimelineChanged(@NonNull Timeline timeline, int reason) {
+    if (isWaitingForValidDuration && exoPlayer.getPlaybackState() == Player.STATE_READY) {
+      maybeSendInitialized();
+    }
+  }
+
   @Override
   public void onPlayerError(@NonNull final PlaybackException error) {
     if (error.errorCode == PlaybackException.ERROR_CODE_BEHIND_LIVE_WINDOW) {

packages/video_player/video_player_android/android/src/main/java/io/flutter/plugins/videoplayer/VideoPlayer.java

@@ -35,6 +35,7 @@ public abstract class VideoPlayer implements VideoPlayerInstanceApi {
   @NonNull protected final VideoPlayerCallbacks videoPlayerEvents;
   @Nullable protected final SurfaceProducer surfaceProducer;
   @Nullable private DisposeHandler disposeHandler;
+  @Nullable private ExoPlayerEventListener exoPlayerEventListener;
   @NonNull protected ExoPlayer exoPlayer;
   // TODO: Migrate to stable API, see https://github.com/flutter/flutter/issues/147039.
   @UnstableApi @Nullable protected DefaultTrackSelector trackSelector;
@@ -82,7 +83,8 @@ public VideoPlayer(
 
     exoPlayer.setMediaItem(mediaItem);
     exoPlayer.prepare();
-    exoPlayer.addListener(createExoPlayerEventListener(exoPlayer, surfaceProducer));
+    exoPlayerEventListener = createExoPlayerEventListener(exoPlayer, surfaceProducer);
+    exoPlayer.addListener(exoPlayerEventListener);
     setAudioAttributes(exoPlayer, options.mixWithOthers);
   }
 
@@ -453,6 +455,10 @@ public void dispose() {
     if (disposeHandler != null) {
       disposeHandler.onDispose();
     }
+    if (exoPlayerEventListener != null) {
+      exoPlayerEventListener.dispose();
+      exoPlayerEventListener = null;
+    }
     exoPlayer.release();
   }
 }

packages/video_player/video_player_android/android/src/test/java/io/flutter/plugins/videoplayer/ExoPlayerEventListenerTest.java

@@ -4,14 +4,21 @@
 
 package io.flutter.plugins.videoplayer;
 
+import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
+import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.verifyNoInteractions;
 import static org.mockito.Mockito.verifyNoMoreInteractions;
+import static org.mockito.Mockito.when;
 
+import android.os.Looper;
+import androidx.media3.common.C;
 import androidx.media3.common.PlaybackException;
 import androidx.media3.common.Player;
+import androidx.media3.common.Timeline;
 import androidx.media3.exoplayer.ExoPlayer;
+import java.time.Duration;
 import org.junit.Before;
 import org.junit.Rule;
 import org.junit.Test;
@@ -20,6 +27,7 @@
 import org.mockito.junit.MockitoJUnit;
 import org.mockito.junit.MockitoRule;
 import org.robolectric.RobolectricTestRunner;
+import org.robolectric.Shadows;
 
 /**
  * Unit tests for {@link ExoPlayerEventListener}.
@@ -87,13 +95,71 @@ public void onPlaybackStateChangedIdleSendsIdle() {
 
   @Test
   public void onPlaybackStateChangedReadySendsInitializedAndReady() {
+    when(mockExoPlayer.getDuration()).thenReturn(10L);
+
     eventListener.onPlaybackStateChanged(Player.STATE_READY);
 
     verify(mockCallbacks).onPlaybackStateChanged(PlatformPlaybackState.READY);
     verifyNoMoreInteractions(mockCallbacks);
     assertTrue(eventListener.calledSendInitialized());
   }
 
+  @Test
+  public void onPlaybackStateChangedReadyDelaysInitializationWhenDurationUnsetForNonLiveMedia() {
+    when(mockExoPlayer.getDuration()).thenReturn(C.TIME_UNSET);
+    when(mockExoPlayer.isCurrentMediaItemLive()).thenReturn(false);
+    when(mockExoPlayer.isCurrentMediaItemDynamic()).thenReturn(false);
+
+    eventListener.onPlaybackStateChanged(Player.STATE_READY);
+
+    verify(mockCallbacks).onPlaybackStateChanged(PlatformPlaybackState.READY);
+    verifyNoMoreInteractions(mockCallbacks);
+    assertFalse(eventListener.calledSendInitialized());
+  }
+
+  @Test
+  public void onPlaybackStateChangedReadySendsInitializedImmediatelyWhenDurationAvailable() {
+    when(mockExoPlayer.getDuration()).thenReturn(10L);
+
+    eventListener.onPlaybackStateChanged(Player.STATE_READY);
+
+    assertTrue(eventListener.calledSendInitialized());
+  }
+
+  @Test
+  public void onPlaybackStateChangedReadyFallsBackWhenDurationRemainsUnset() {
+    when(mockExoPlayer.getDuration()).thenReturn(C.TIME_UNSET);
+    when(mockExoPlayer.isCurrentMediaItemLive()).thenReturn(false);
+    when(mockExoPlayer.isCurrentMediaItemDynamic()).thenReturn(false);
+
+    eventListener.onPlaybackStateChanged(Player.STATE_READY);
+    assertFalse(eventListener.calledSendInitialized());
+
+    Shadows.shadowOf(Looper.getMainLooper())
+        .idleFor(
+            Duration.ofMillis(ExoPlayerEventListener.DURATION_UNSET_INITIALIZATION_TIMEOUT_MS));
+
+    assertTrue(eventListener.calledSendInitialized());
+  }
+
+  @Test
+  public void onTimelineChangedSendsInitializedWhenDurationBecomesAvailable() {
+    when(mockExoPlayer.getDuration()).thenReturn(C.TIME_UNSET);
+    when(mockExoPlayer.isCurrentMediaItemLive()).thenReturn(false);
+    when(mockExoPlayer.isCurrentMediaItemDynamic()).thenReturn(false);
+
+    eventListener.onPlaybackStateChanged(Player.STATE_READY);
+    assertFalse(eventListener.calledSendInitialized());
+
+    when(mockExoPlayer.getPlaybackState()).thenReturn(Player.STATE_READY);
+    when(mockExoPlayer.getDuration()).thenReturn(10L);
+
+    eventListener.onTimelineChanged(
+        mock(Timeline.class), Player.TIMELINE_CHANGE_REASON_SOURCE_UPDATE);
+
+    assertTrue(eventListener.calledSendInitialized());
+  }
+
   @Test
   public void onErrorBehindLiveWindowSeekToDefaultAndPrepare() {
     eventListener.onPlayerError(

packages/video_player/video_player_android/pubspec.yaml

@@ -2,7 +2,7 @@ name: video_player_android
 description: Android implementation of the video_player plugin.
 repository: https://github.com/flutter/packages/tree/main/packages/video_player/video_player_android
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+video_player%22
-version: 2.11.0
+version: 2.12.0
 
 environment:
   sdk: ^3.12.0