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Bug 1151299: Part1. Only attempt to decode first frame when available. r=mattwoodrow

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Don't rely on the demuxer to be blocking when attempting to decode the first
MSE frame.
This commit is contained in:
Jean-Yves Avenard 2015-04-07 20:33:17 +10:00
parent 7a51dcf194
commit 51a0437eb8
2 changed files with 57 additions and 8 deletions
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64
dom/media/mediasource/MediaSourceReader.cpp
View File

@ -168,12 +168,16 @@ MediaSourceReader::RequestAudioData()
&MediaSourceReader::CompleteAudioSeekAndRejectPromise));
break;
case SOURCE_NONE:
if (mLastAudioTime) {
if (!mLastAudioTime) {
// This is the first call to RequestAudioData.
// Fallback to using decoder with earliest data.
mAudioSourceDecoder = FirstDecoder(MediaData::AUDIO_DATA);
}
if (mLastAudioTime || !mAudioSourceDecoder) {
CheckForWaitOrEndOfStream(MediaData::AUDIO_DATA, mLastAudioTime);
break;
}
// Fallback to using first reader
mAudioSourceDecoder = mAudioTrack->Decoders()[0];
// Fallback to getting first frame from first decoder.
default:
DoAudioRequest();
break;
@ -338,12 +342,16 @@ MediaSourceReader::RequestVideoData(bool aSkipToNextKeyframe, int64_t aTimeThres
&MediaSourceReader::CompleteVideoSeekAndRejectPromise));
break;
case SOURCE_NONE:
if (mLastVideoTime) {
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 using first reader.
mVideoSourceDecoder = mVideoTrack->Decoders()[0];
// Fallback to getting first frame from first decoder.
default:
DoVideoRequest();
break;
@ -1033,6 +1041,36 @@ MediaSourceReader::GetBuffered(dom::TimeRanges* aBuffered)
return NS_OK;
}
already_AddRefed<SourceBufferDecoder>
MediaSourceReader::FirstDecoder(MediaData::Type aType)
{
ReentrantMonitorAutoEnter mon(mDecoder->GetReentrantMonitor());
TrackBuffer* trackBuffer =
aType == MediaData::AUDIO_DATA ? mAudioTrack : mVideoTrack;
MOZ_ASSERT(trackBuffer);
const nsTArray<nsRefPtr<SourceBufferDecoder>>& decoders = trackBuffer->Decoders();
if (decoders.IsEmpty()) {
return nullptr;
}
nsRefPtr<SourceBufferDecoder> firstDecoder;
double lowestStartTime = PositiveInfinity<double>();
for (uint32_t i = 0; i < decoders.Length(); ++i) {
nsRefPtr<TimeRanges> r = new TimeRanges();
decoders[i]->GetBuffered(r);
double start = r->GetStartTime();
if (start < 0) {
continue;
}
if (start < lowestStartTime) {
firstDecoder = decoders[i];
lowestStartTime = start;
}
}
return firstDecoder.forget();
}
nsRefPtr<MediaDecoderReader::WaitForDataPromise>
MediaSourceReader::WaitForData(MediaData::Type aType)
{
@ -1053,13 +1091,23 @@ MediaSourceReader::MaybeNotifyHaveData()
// The next Request*Data will handle END_OF_STREAM or going back into waiting
// mode.
if (!IsSeeking() && mAudioTrack) {
haveAudio = HaveData(mLastAudioTime, MediaData::AUDIO_DATA);
if (!mLastAudioTime) {
nsRefPtr<SourceBufferDecoder> d = FirstDecoder(MediaData::AUDIO_DATA);
haveAudio = !!d;
} else {
haveAudio = HaveData(mLastAudioTime, MediaData::AUDIO_DATA);
}
if (ended || haveAudio) {
WaitPromise(MediaData::AUDIO_DATA).ResolveIfExists(MediaData::AUDIO_DATA, __func__);
}
}
if (!IsSeeking() && mVideoTrack) {
haveVideo = HaveData(mLastVideoTime, MediaData::VIDEO_DATA);
if (!mLastVideoTime) {
nsRefPtr<SourceBufferDecoder> d = FirstDecoder(MediaData::VIDEO_DATA);
haveVideo = !!d;
} else {
haveVideo = HaveData(mLastVideoTime, MediaData::VIDEO_DATA);
}
if (ended || haveVideo) {
WaitPromise(MediaData::VIDEO_DATA).ResolveIfExists(MediaData::VIDEO_DATA, __func__);
}

1
dom/media/mediasource/MediaSourceReader.h
View File

@ -223,6 +223,7 @@ private:
int64_t aTolerance /* microseconds */,
const nsTArray<nsRefPtr<SourceBufferDecoder>>& aTrackDecoders);
bool HaveData(int64_t aTarget, MediaData::Type aType);
already_AddRefed<SourceBufferDecoder> FirstDecoder(MediaData::Type aType);
void AttemptSeek();
bool IsSeeking() { return mPendingSeekTime != -1; }