void iTrackReader.seekToSample(StreamPosition index)
{
Mp4StreamPosition pos = (Mp4StreamPosition)index;
sampleReader.seekToSample(pos.sample);
state = default;
}
MediaSeekPosition iDecoderThread.findStreamsPosition(TimeSpan where)
{
StreamPosition video = reader.findStreamPosition(where);
StreamPosition audio = null;
if (null != audioReader)
{
audio = audioReader.findStreamPosition(where);
}
return(new MediaSeekPosition(video, audio));
}
/// <summary>Called from the main loop of this thread in response to seekEventHandle event being signalled.</summary>
bool handleSeek()
{
seekEventHandle.reset();
MediaSeekPosition seekPosition;
lock ( syncRoot )
{
if (!this.seekPosition.HasValue)
{
throw new ApplicationException();
}
seekPosition = this.seekPosition.Value;
}
Logger.logVerbose("Processing seek request: {0}", seekPosition);
StreamPosition audioSample = null;
if (null != seekPosition.audio && null != audioReader)
{
audioSample = audioReader.findKeyFrame(seekPosition.audio);
}
StreamPosition videoSample = reader.findKeyFrame(seekPosition.video);
eventsSink.discardDecoded();
presentationClock.waitForAudioDrain();
if (null != audioReader)
{
audioReader.seekToSample(audioSample);
}
reader.seekToSample(videoSample);
Stopwatch sw = Stopwatch.StartNew();
if (!waitForVideoFrame(seekPosition.video.time))
{
return(false);
}
TimeSpan elapsed = sw.Elapsed;
/* int frames = seekPosition.video.Value.sample - videoSample + 1;
* Logger.logDebug( "DecoderThread.handleSeek decoded the target frame of the video. It took {0:G3} seconds and {1}",
* elapsed.TotalSeconds, frames.pluralString( "frame" ) ); */
presentationClock.signalVideoReady();
return(true);
}
StreamPosition iTrackReader.findKeyFrame(StreamPosition seekFrame) => sampleReader.findKeyFrame((Mp4StreamPosition)seekFrame);