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Bug 1008800 - Seek android audio to video position after fastSeek, speeds up fastSeek by 12%. r=doublec

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This commit is contained in:
Chris Pearce 2014-05-13 09:10:16 +12:00
parent 4b8299098c
commit 748bbc4459
1 changed files with 15 additions and 1 deletions
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16
content/media/plugins/MediaPluginReader.cpp
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@ -324,7 +324,21 @@ nsresult MediaPluginReader::Seek(int64_t aTarget, int64_t aStartTime, int64_t aE
mVideoQueue.Reset();
mAudioQueue.Reset();
mAudioSeekTimeUs = mVideoSeekTimeUs = aTarget;
if (mHasAudio && mHasVideo) {
// The decoder seeks/demuxes audio and video streams separately. So if
// we seek both audio and video to aTarget, the audio stream can typically
// seek closer to the seek target, since typically every audio block is
// a sync point, whereas for video there are only keyframes once every few
// seconds. So if we have both audio and video, we must seek the video
// stream to the preceeding keyframe first, get the stream time, and then
// seek the audio stream to match the video stream's time. Otherwise, the
// audio and video streams won't be in sync after the seek.
mVideoSeekTimeUs = aTarget;
const VideoData* v = DecodeToFirstVideoData();
mAudioSeekTimeUs = v ? v->mTime : aTarget;
} else {
mAudioSeekTimeUs = mVideoSeekTimeUs = aTarget;
}
return NS_OK;
}