static bool
ZeroDurationAtLastChunk(VideoSegment& aInput)
{
// Get the last video frame's start time in VideoSegment aInput.
// If the start time is equal to the duration of aInput, means the last video
// frame's duration is zero.
StreamTime lastVideoStratTime;
aInput.GetLastFrame(&lastVideoStratTime);
return lastVideoStratTime == aInput.GetDuration();
}
void
DecodedStream::SendVideo(bool aIsSameOrigin, const PrincipalHandle& aPrincipalHandle)
{
AssertOwnerThread();
if (!mInfo.HasVideo()) {
return;
}
VideoSegment output;
TrackID videoTrackId = mInfo.mVideo.mTrackId;
AutoTArray<RefPtr<MediaData>, 10> video;
SourceMediaStream* sourceStream = mData->mStream;
// It's OK to hold references to the VideoData because VideoData
// is ref-counted.
mVideoQueue.GetElementsAfter(mData->mNextVideoTime, &video);
// tracksStartTimeStamp might be null when the SourceMediaStream not yet
// be added to MediaStreamGraph.
TimeStamp tracksStartTimeStamp = sourceStream->GetStreamTracksStrartTimeStamp();
if (tracksStartTimeStamp.IsNull()) {
tracksStartTimeStamp = TimeStamp::Now();
}
for (uint32_t i = 0; i < video.Length(); ++i) {
VideoData* v = video[i]->As<VideoData>();
if (mData->mNextVideoTime < v->mTime) {
// Write last video frame to catch up. mLastVideoImage can be null here
// which is fine, it just means there's no video.
// TODO: |mLastVideoImage| should come from the last image rendered
// by the state machine. This will avoid the black frame when capture
// happens in the middle of playback (especially in th middle of a
// video frame). E.g. if we have a video frame that is 30 sec long
// and capture happens at 15 sec, we'll have to append a black frame
// that is 15 sec long.
WriteVideoToMediaStream(sourceStream, mData->mLastVideoImage, v->mTime,
mData->mNextVideoTime, mData->mLastVideoImageDisplaySize,
tracksStartTimeStamp + TimeDuration::FromMicroseconds(v->mTime),
&output, aPrincipalHandle);
mData->mNextVideoTime = v->mTime;
}
if (mData->mNextVideoTime < v->GetEndTime()) {
WriteVideoToMediaStream(sourceStream, v->mImage, v->GetEndTime(),
mData->mNextVideoTime, v->mDisplay,
tracksStartTimeStamp + TimeDuration::FromMicroseconds(v->GetEndTime()),
&output, aPrincipalHandle);
mData->mNextVideoTime = v->GetEndTime();
mData->mLastVideoImage = v->mImage;
mData->mLastVideoImageDisplaySize = v->mDisplay;
}
}
// Check the output is not empty.
if (output.GetLastFrame()) {
mData->mEOSVideoCompensation = ZeroDurationAtLastChunk(output);
}
if (!aIsSameOrigin) {
output.ReplaceWithDisabled();
}
if (output.GetDuration() > 0) {
sourceStream->AppendToTrack(videoTrackId, &output);
}
if (mVideoQueue.IsFinished() && !mData->mHaveSentFinishVideo) {
if (mData->mEOSVideoCompensation) {
VideoSegment endSegment;
// Calculate the deviation clock time from DecodedStream.
int64_t deviation_usec = sourceStream->StreamTimeToMicroseconds(1);
WriteVideoToMediaStream(sourceStream, mData->mLastVideoImage,
mData->mNextVideoTime + deviation_usec, mData->mNextVideoTime,
mData->mLastVideoImageDisplaySize,
tracksStartTimeStamp + TimeDuration::FromMicroseconds(mData->mNextVideoTime + deviation_usec),
&endSegment, aPrincipalHandle);
mData->mNextVideoTime += deviation_usec;
MOZ_ASSERT(endSegment.GetDuration() > 0);
if (!aIsSameOrigin) {
endSegment.ReplaceWithDisabled();
}
sourceStream->AppendToTrack(videoTrackId, &endSegment);
}
sourceStream->EndTrack(videoTrackId);
mData->mHaveSentFinishVideo = true;
}
}
