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Handle preload callbacks asynchronously in PreloadMediaSource

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When there is an exception thrown from the `LoadTask`, the `Loader` will call `Loader.Callback.onLoadError`. Some implementations of `onLoadError` method may call `MediaPeriod.onContinueLoadingRequested`, and in the `PreloadMediaSource`, its `PreloadMediaPeriodCallback` will be triggered and then it can further call `continueLoading` if it finds needed. However the above process is currently done synchronously, which will cause problem. By calling `continueLoading`, the `Loader` is set with a `currentTask`, and when that long sync logic in `Loader.Callback.onLoadError` ends, the `Loader` will immediately retry, and then a non-null `currentTask` will cause the `IllegalStateException`.

Issue: androidx/media#1568

#cherrypick

PiperOrigin-RevId: 662550622
This commit is contained in:
tianyifeng 2024-08-13 09:43:07 -07:00 committed by Copybara-Service
parent 0b23285bae
commit cd532c5fb2
2 changed files with 74 additions and 63 deletions
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2
RELEASENOTES.md
View File

@ -32,6 +32,8 @@
zero.
* Allow the user to select the built-in speaker for playback on Wear OS
API 35+ (where the device advertises support for this).
* Handle preload callbacks asynchronously in `PreloadMediaSource`
([#1568](https://github.com/androidx/media/issues/1568)).
* Transformer:
* Add `SurfaceAssetLoader`, which supports queueing video data to
Transformer via a `Surface`.

135
libraries/exoplayer/src/main/java/androidx/media3/exoplayer/source/preload/PreloadMediaSource.java
View File

@ -306,26 +306,29 @@ public final class PreloadMediaSource extends WrappingMediaSource {
protected void onChildSourceInfoRefreshed(Timeline newTimeline) {
this.timeline = newTimeline;
refreshSourceInfo(newTimeline);
if (isUsedByPlayer() || onSourcePreparedNotified) {
return;
}
onSourcePreparedNotified = true;
if (!preloadControl.onSourcePrepared(this)) {
stopPreloading();
return;
}
Pair<Object, Long> periodPosition =
newTimeline.getPeriodPositionUs(
new Timeline.Window(),
new Timeline.Period(),
/* windowIndex= */ 0,
/* windowPositionUs= */ startPositionUs);
MediaPeriodId mediaPeriodId = new MediaPeriodId(periodPosition.first);
PreloadMediaPeriod mediaPeriod =
PreloadMediaSource.this.createPeriod(mediaPeriodId, allocator, periodPosition.second);
mediaPeriod.preload(
new PreloadMediaPeriodCallback(periodPosition.second),
/* positionUs= */ periodPosition.second);
preloadHandler.post(
() -> {
if (isUsedByPlayer() || onSourcePreparedNotified) {
return;
}
onSourcePreparedNotified = true;
if (!preloadControl.onSourcePrepared(this)) {
stopPreloading();
return;
}
Pair<Object, Long> periodPosition =
newTimeline.getPeriodPositionUs(
new Timeline.Window(),
new Timeline.Period(),
/* windowIndex= */ 0,
/* windowPositionUs= */ startPositionUs);
MediaPeriodId mediaPeriodId = new MediaPeriodId(periodPosition.first);
PreloadMediaPeriod mediaPeriod =
PreloadMediaSource.this.createPeriod(mediaPeriodId, allocator, periodPosition.second);
mediaPeriod.preload(
new PreloadMediaPeriodCallback(periodPosition.second),
/* positionUs= */ periodPosition.second);
});
}
@Override
@ -455,53 +458,59 @@ public final class PreloadMediaSource extends WrappingMediaSource {
@Override
public void onPrepared(MediaPeriod mediaPeriod) {
prepared = true;
if (isUsedByPlayer()) {
return;
}
PreloadMediaPeriod preloadMediaPeriod = (PreloadMediaPeriod) mediaPeriod;
TrackGroupArray trackGroups = preloadMediaPeriod.getTrackGroups();
@Nullable TrackSelectorResult trackSelectorResult = null;
MediaPeriodKey key = checkNotNull(preloadingMediaPeriodAndKey).second;
try {
trackSelectorResult =
trackSelector.selectTracks(
rendererCapabilities, trackGroups, key.mediaPeriodId, checkNotNull(timeline));
} catch (ExoPlaybackException e) {
Log.e(TAG, "Failed to select tracks", e);
}
if (trackSelectorResult == null) {
stopPreloading();
return;
}
preloadMediaPeriod.selectTracksForPreloading(
trackSelectorResult.selections, periodStartPositionUs);
if (!preloadControl.onTracksSelected(PreloadMediaSource.this)) {
stopPreloading();
return;
}
preloadMediaPeriod.continueLoading(
new LoadingInfo.Builder().setPlaybackPositionUs(periodStartPositionUs).build());
preloadHandler.post(
() -> {
if (isUsedByPlayer()) {
return;
}
PreloadMediaPeriod preloadMediaPeriod = (PreloadMediaPeriod) mediaPeriod;
TrackGroupArray trackGroups = preloadMediaPeriod.getTrackGroups();
@Nullable TrackSelectorResult trackSelectorResult = null;
MediaPeriodKey key = checkNotNull(preloadingMediaPeriodAndKey).second;
try {
trackSelectorResult =
trackSelector.selectTracks(
rendererCapabilities, trackGroups, key.mediaPeriodId, checkNotNull(timeline));
} catch (ExoPlaybackException e) {
Log.e(TAG, "Failed to select tracks", e);
}
if (trackSelectorResult == null) {
stopPreloading();
return;
}
preloadMediaPeriod.selectTracksForPreloading(
trackSelectorResult.selections, periodStartPositionUs);
if (!preloadControl.onTracksSelected(PreloadMediaSource.this)) {
stopPreloading();
return;
}
preloadMediaPeriod.continueLoading(
new LoadingInfo.Builder().setPlaybackPositionUs(periodStartPositionUs).build());
});
}
@Override
public void onContinueLoadingRequested(MediaPeriod mediaPeriod) {
if (isUsedByPlayer()) {
return;
}
PreloadMediaPeriod preloadMediaPeriod = (PreloadMediaPeriod) mediaPeriod;
if (prepared && mediaPeriod.getBufferedPositionUs() == C.TIME_END_OF_SOURCE) {
preloadControl.onLoadedToTheEndOfSource(PreloadMediaSource.this);
stopPreloading();
return;
}
if (prepared
&& !preloadControl.onContinueLoadingRequested(
PreloadMediaSource.this, preloadMediaPeriod.getBufferedPositionUs())) {
stopPreloading();
return;
}
preloadMediaPeriod.continueLoading(
new LoadingInfo.Builder().setPlaybackPositionUs(periodStartPositionUs).build());
preloadHandler.post(
() -> {
if (isUsedByPlayer()) {
return;
}
PreloadMediaPeriod preloadMediaPeriod = (PreloadMediaPeriod) mediaPeriod;
if (prepared && mediaPeriod.getBufferedPositionUs() == C.TIME_END_OF_SOURCE) {
preloadControl.onLoadedToTheEndOfSource(PreloadMediaSource.this);
stopPreloading();
return;
}
if (prepared
&& !preloadControl.onContinueLoadingRequested(
PreloadMediaSource.this, preloadMediaPeriod.getBufferedPositionUs())) {
stopPreloading();
return;
}
preloadMediaPeriod.continueLoading(
new LoadingInfo.Builder().setPlaybackPositionUs(periodStartPositionUs).build());
});
}
}