double synchronizeVideo(double videoPts)
{
// assume delay to next frame equals delay between previous frames
double delay = videoPts - previousVideoPts;
if (delay <= 0 || delay >= 1.0)
{
// if incorrect delay, use previous one
delay = previousVideoDelay;
}
previousVideoPts = videoPts;
previousVideoDelay = delay;
if (videoDecoder.HasAudio && syncMode == SyncMode.VIDEO_SYNCS_TO_AUDIO)
{
// synchronize video to audio
double diff = getVideoClock() - audioPlayer.getAudioClock();
// Skip or repeat the frame. Take delay into account
// FFPlay still doesn't "know if this is the best guess."
double sync_threshold = (delay > AV_SYNC_THRESHOLD) ? delay : AV_SYNC_THRESHOLD;
if (Math.Abs(diff) < AV_NOSYNC_THRESHOLD)
{
if (diff <= -sync_threshold)
{
delay = 0;
}
else if (diff >= sync_threshold)
{
delay = 2 * delay;
}
}
}
// adjust delay based on the actual current time
videoFrameTimer += delay;
double actualDelay = videoFrameTimer - HRTimer.getTimestamp();
videoDebug.VideoDelay = delay;
videoDebug.ActualVideoDelay = actualDelay;
videoDebug.VideoSync = getVideoClock();
videoDebug.AudioSync = audioPlayer.getAudioClock();
videoDebug.VideoQueueSize = videoDecoder.FrameQueue.VideoPacketsInQueue;
videoDebug.AudioQueueSize = videoDecoder.FrameQueue.AudioPacketsInQueue;
return(actualDelay);
}
