nsRefPtr<MediaDecoderReader::VideoDataPromise>
MediaSourceReader::RequestVideoData(bool aSkipToNextKeyframe,
int64_t aTimeThreshold,
bool aForceDecodeAhead)
{
MOZ_ASSERT(OnTaskQueue());
MOZ_DIAGNOSTIC_ASSERT(mSeekPromise.IsEmpty(), "No sample requests allowed while seeking");
MOZ_DIAGNOSTIC_ASSERT(mVideoPromise.IsEmpty(), "No duplicate sample requests");
nsRefPtr<VideoDataPromise> p = mVideoPromise.Ensure(__func__);
MSE_DEBUGV("RequestVideoData(%d, %lld), mLastVideoTime=%lld",
aSkipToNextKeyframe, aTimeThreshold, mLastVideoTime);
if (!mVideoTrack) {
MSE_DEBUG("called with no video track");
mVideoPromise.Reject(DECODE_ERROR, __func__);
return p;
}
if (aSkipToNextKeyframe) {
mTimeThreshold = aTimeThreshold;
mDropAudioBeforeThreshold = true;
mDropVideoBeforeThreshold = true;
}
if (IsSeeking()) {
MSE_DEBUG("called mid-seek. Rejecting.");
mVideoPromise.Reject(CANCELED, __func__);
return p;
}
MOZ_DIAGNOSTIC_ASSERT(!mVideoSeekRequest.Exists());
mForceVideoDecodeAhead = aForceDecodeAhead;
SwitchSourceResult ret = SwitchVideoSource(&mLastVideoTime);
switch (ret) {
case SOURCE_NEW:
GetVideoReader()->ResetDecode();
mVideoSeekRequest.Begin(GetVideoReader()->Seek(GetReaderVideoTime(mLastVideoTime), 0)
->Then(OwnerThread(), __func__, this,
&MediaSourceReader::CompleteVideoSeekAndDoRequest,
&MediaSourceReader::CompleteVideoSeekAndRejectPromise));
break;
case SOURCE_NONE:
if (!mLastVideoTime) {
// This is the first call to RequestVideoData.
// Fallback to using decoder with earliest data.
mVideoSourceDecoder = FirstDecoder(MediaData::VIDEO_DATA);
}
if (mLastVideoTime || !mVideoSourceDecoder) {
CheckForWaitOrEndOfStream(MediaData::VIDEO_DATA, mLastVideoTime);
break;
}
// Fallback to getting first frame from first decoder.
default:
DoVideoRequest();
break;
}
return p;
}
void
MediaSourceReader::OnVideoNotDecoded(NotDecodedReason aReason)
{
MOZ_DIAGNOSTIC_ASSERT(!IsSeeking());
mVideoRequest.Complete();
MSE_DEBUG("aReason=%u IsEnded: %d", aReason, IsEnded());
if (aReason == CANCELED) {
mVideoPromise.Reject(CANCELED, __func__);
return;
}
// if End of stream. Force switching past this stream to another reader by
// switching to the end of the buffered range.
int64_t lastVideoTime = mLastVideoTime;
if (aReason == END_OF_STREAM && mVideoSourceDecoder) {
AdjustEndTime(&mLastVideoTime, mVideoSourceDecoder);
}
// See if we can find a different reader that can pick up where we left off.
SwitchSourceResult result = SwitchVideoSource(&mLastVideoTime);
if (result == SOURCE_NEW) {
GetVideoReader()->ResetDecode();
mVideoSeekRequest.Begin(GetVideoReader()->Seek(GetReaderVideoTime(mLastVideoTime), 0)
->RefableThen(GetTaskQueue(), __func__, this,
&MediaSourceReader::CompleteVideoSeekAndDoRequest,
&MediaSourceReader::CompleteVideoSeekAndRejectPromise));
return;
}
// If we got a DECODE_ERROR and we have buffered data in the requested range
// then it must be a genuine decoding error.
// Otherwise we can assume that the data was either evicted or explicitely
// removed from the source buffer and we should wait for new data.
if (aReason == DECODE_ERROR && result != SOURCE_NONE) {
mVideoPromise.Reject(DECODE_ERROR, __func__);
return;
}
CheckForWaitOrEndOfStream(MediaData::VIDEO_DATA, mLastVideoTime);
if (mLastVideoTime - lastVideoTime >= EOS_FUZZ_US) {
// No decoders are available to switch to. We will re-attempt from the last
// failing position.
mLastVideoTime = lastVideoTime;
}
}
void
MediaSourceReader::DoVideoSeek()
{
int64_t seekTime = mPendingSeekTime;
if (mSeekToEnd) {
seekTime = LastSampleTime(MediaData::VIDEO_DATA);
}
if (SwitchVideoSource(&seekTime) == SOURCE_NONE) {
// Data we need got evicted since the last time we checked for data
// availability. Abort current seek attempt.
mWaitingForSeekData = true;
return;
}
GetVideoReader()->ResetDecode();
mVideoSeekRequest.Begin(GetVideoReader()->Seek(GetReaderVideoTime(seekTime), 0)
->RefableThen(GetTaskQueue(), __func__, this,
&MediaSourceReader::OnVideoSeekCompleted,
&MediaSourceReader::OnVideoSeekFailed));
MSE_DEBUG("reader=%p", GetVideoReader());
}
