private bool ReadTag()
{
if (_fileLength - _fileOffset < 11)
{
return(false);
}
// Read tag header
var tagType = ReadUInt8();
var dataSize = ReadUInt24();
var timeStamp = ReadUInt24();
timeStamp |= ReadUInt8() << 24;
ReadUInt24(); //streamID
// Read tag data
if (dataSize == 0)
{
return(true);
}
if (_fileLength - _fileOffset < dataSize)
{
return(false);
}
var mediaInfo = ReadUInt8();
dataSize -= 1;
var data = ReadBytes((int)dataSize);
if (tagType == 0x8)
{
// Audio
if (_audioWriter == null)
{
_audioWriter = _extractAudio ? GetAudioWriter(mediaInfo) : new DummyAudioWriter();
ExtractedAudio = !(_audioWriter is DummyAudioWriter);
}
_audioWriter.WriteChunk(data, timeStamp);
}
else if (tagType == 0x9 && mediaInfo >> 4 != 5)
{
// Video
if (_videoWriter == null)
{
_videoWriter = _extractVideo ? GetVideoWriter(mediaInfo) : new DummyVideoWriter();
ExtractedVideo = !(_videoWriter is DummyVideoWriter);
}
if (_timeCodeWriter == null)
{
var path = $@"{_outputPathBase}.txt";
_timeCodeWriter = new TimeCodeWriter(_extractTimeCodes && CanWriteTo(path) ? path : null);
ExtractedTimeCodes = _extractTimeCodes;
}
_videoTimeStamps.Add(timeStamp);
_videoWriter.WriteChunk(data, timeStamp, (int)((mediaInfo & 0xF0) >> 4));
_timeCodeWriter.Write(timeStamp);
}
return(true);
}
private void CloseOutput(FractionUInt32?averageFrameRate, bool disposing)
{
if (_videoWriter != null)
{
_videoWriter.Finish(averageFrameRate ?? new FractionUInt32(25, 1));
if (disposing && _videoWriter.Path != null)
{
try
{
File.Delete(_videoWriter.Path);
}
catch
{
// ignored
}
}
_videoWriter = null;
}
if (_audioWriter != null)
{
_audioWriter.Finish();
if (disposing && _audioWriter.Path != null)
{
try
{
File.Delete(_audioWriter.Path);
}
catch
{
// ignored
}
}
_audioWriter = null;
}
if (_timeCodeWriter != null)
{
_timeCodeWriter.Finish();
if (disposing && _timeCodeWriter.Path != null)
{
try
{
File.Delete(_timeCodeWriter.Path);
}
catch
{
// ignored
}
}
_timeCodeWriter = null;
}
}