public MKVFileSource(Document document)
{
_Document = document;
_Segment = document.Segments[0];
//활성화된 트랙에서 필요한 코덱리스트를 생성
var codecs = CodecFactory.Create(_Segment.Tracks[0].TrackEntry.Where(x => x.FlagEnabled == 1).ToList());
//사용가능한 모든 코덱 추가
UsableCodecs = codecs.Where(x => x.IsSupported).Cast <KnownCodec>();
//사용가능한 미디어 코덱만 추가
UsableMediaCodecs = UsableCodecs.Where(x => x.CodecType == TrackTypes.Video || x.CodecType == TrackTypes.Audio);
//사용가능한 자막 코덱 리스트를 생성
UsableSubtitleCodecs = UsableCodecs.Where(x => x.CodecType == TrackTypes.Subtitle);
//디폴트 비디오 트랙의 코덱
var videoCodec = UsableMediaCodecs.FirstOrDefault(x => x.CodecType == TrackTypes.Video && x.TrackEntry.FlagDefault == 1);
if (videoCodec == null)
{
videoCodec = UsableMediaCodecs.FirstOrDefault(x => x.CodecType == TrackTypes.Video);
}
var audioCodec = UsableMediaCodecs.FirstOrDefault(x => x.CodecType == TrackTypes.Audio && x.TrackEntry.FlagDefault == 1);
if (audioCodec == null)
{
audioCodec = UsableMediaCodecs.FirstOrDefault(x => x.CodecType == TrackTypes.Audio);
}
//비디오나 오디오코덱을 사용할 수 없는 경우만 사용 불가능 코덱을 저장
if (videoCodec == null || audioCodec == null)
{
//사용 불가능한 미디어 코덱 저장
UnusableMediaCodecs = codecs.Where(x => !x.IsSupported && (x.CodecType == TrackTypes.Video || x.CodecType == TrackTypes.Audio));
}
else
{
UnusableMediaCodecs = new List <ICodec>();
//디폴트 비디오/오디오 트랙으로 미디어 디스크립터 생성
CreateMediaStreamSource(audioCodec);
}
}
private MediaTypes EnqueueFrameData(Cluster cluster, Block block, ref long timecode)
{
MediaTypes currBlockType = MediaTypes.None;
Block currBlock = null;
BlockGroup blockGroup = null;
Queue <FrameBufferData> frameQueue = null;
//블록 자식 레벨 엘리먼트 로드
currBlock = block.GetBlock(out blockGroup);
//큐 선택
if (currBlock.TrackNumber == VideoTrackID)
{
currBlockType = MediaTypes.Video;
frameQueue = VideoFrameQueue;
}
else if (currBlock.TrackNumber == AudioTrackID)
{
currBlockType = MediaTypes.Audio;
frameQueue = AudioFrameQueue;
}
else if (currBlock.TrackNumber == SubtitleTrackID)
{
currBlockType = MediaTypes.Subtitle;
frameQueue = SubtitleFrameQueue;
}
else
{
return(MediaTypes.None);
}
var codec = UsableCodecs.FirstOrDefault(x => x.TrackNumber == currBlock.TrackNumber);
var track = codec.TrackEntry;
byte[] CompressHeader = codec.CompressHeader;
timecode = ((long)cluster.Timecode + currBlock.Timecode) * Element.TIC_MILLISECONDS;
long timecodeOffset = 0, duration = (long)(track.DefaultDuration / 100); //100나노 초가 1틱이므로 100으로 나눈다.
if (blockGroup != null && blockGroup.BlockDuration > 0)
{
duration = (long)blockGroup.BlockDuration * Element.TIC_MILLISECONDS;
}
var dts = currBlock.GetBlockData(CompressHeader);
foreach (var item in dts)
{
try
{
var frame = codec.GetFrameBufferData(
item,
(long)timecodeOffset + (long)timecode,
duration,
currBlock.IsKeyFrame,
currBlock.Discardable,
currBlock.Invisible);
frameQueue.Enqueue(frame);
timecodeOffset += duration;
}
catch (Exception)
{
throw;
}
}
//리턴값 (마지막 시간)
timecode += timecodeOffset;
//블록 타입
return(currBlockType);
}
