public byte[] capture(AudioBuffer input)
{
if (IsSupported)
{
return(AcousticEchoCanceller.Capture(input.Data, input.Index, input.Length));
}
else
{
return(BitAssistant.SubArray(input.Data, input.Index, input.Length));
}
}
private int ReadNextFrameLength()
{
while (true)
{
if (_StreamPosition == _BlockGroupEndPosition)
{
_InBlockGroup = false;
_BlockGroupEndPosition = -1;
}
if (_StreamPosition == _ClusterEndPosition)
{
_InCluster = false;
_ClusterEndPosition = -1;
}
if (_StreamPosition == _SegmentEndPosition)
{
_InSegment = false;
_SegmentEndPosition = -1;
}
var id = ReadId(_Stream);
if (id.Length == 1 && id[0] == 0xFF)
{
// end of stream
return(0);
}
if (!_HasEbml)
{
if (Element.Compare(id, Ebml.EbmlId))
{
// read this in one block
_ = ReadValue(id);
_HasEbml = true;
}
else if (Element.Compare(id, EbmlCrc32Id))
{
// verify
ReadValue(id);
}
else if (Element.Compare(id, EbmlVoidId))
{
// ignore
ReadValue(id);
}
else
{
throw new NotImplementedException($"Unexpected ID '{BitAssistant.GetHexString(id)}' at stream offset '{_StreamPosition}'.");
}
}
else if (!_InSegment)
{
if (Element.Compare(id, Segment.EbmlId))
{
// don't read the value
var segmentLength = ReadValueLength(id);
if (segmentLength != -1)
{
_SegmentEndPosition = _StreamPosition + segmentLength;
}
_InSegment = true;
}
else if (Element.Compare(id, EbmlCrc32Id))
{
// verify
ReadValue(id);
}
else if (Element.Compare(id, EbmlVoidId))
{
// ignore
ReadValue(id);
}
else
{
throw new NotImplementedException($"Unexpected ID '{BitAssistant.GetHexString(id)}' at stream offset '{_StreamPosition}'.");
}
}
else if (!_InCluster)
{
if (Element.Compare(id, SegmentInfo.EbmlId))
{
_SegmentInfo = new SegmentInfo(ReadValue(id));
}
else if (Element.Compare(id, SeekHead.EbmlId))
{
_SeekHeads.Add(new SeekHead(ReadValue(id)));
}
else if (Element.Compare(id, Track.EbmlId))
{
_Tracks.Add(new Track(ReadValue(id)));
}
else if (Element.Compare(id, Cluster.EbmlId))
{
// don't read the value
var clusterLength = ReadValueLength(id);
if (clusterLength != -1)
{
_ClusterEndPosition = _StreamPosition + clusterLength;
}
_InCluster = true;
_ClusterTimecode = -1;
_ClusterPosition = -1;
_ClusterPrevSize = -1;
}
else if (Element.Compare(id, new byte[] { 0x12, 0x54, 0xC3, 0x67 }))
{
//TODO: Tags
ReadValue(id);
}
else if (Element.Compare(id, new byte[] { 0x1C, 0x53, 0xBB, 0x6B }))
{
//TODO: Cues
ReadValue(id);
}
else if (Element.Compare(id, EbmlCrc32Id))
{
// verify
ReadValue(id);
}
else if (Element.Compare(id, EbmlVoidId))
{
// ignore
ReadValue(id);
}
else
{
throw new NotImplementedException($"Unexpected ID '{BitAssistant.GetHexString(id)}' at stream offset '{_StreamPosition}'.");
}
}
else if (!_InBlockGroup)
{
if (Element.Compare(id, EbmlClusterTimecodeId))
{
_ClusterTimecode = Element.ReadUnsignedInteger(ReadValue(id));
}
else if (Element.Compare(id, EbmlClusterPositionId))
{
_ClusterPosition = Element.ReadUnsignedInteger(ReadValue(id));
}
else if (Element.Compare(id, EbmlClusterPrevSizeId))
{
_ClusterPrevSize = Element.ReadUnsignedInteger(ReadValue(id));
}
else if (Element.Compare(id, BlockGroup.EbmlId))
{
// don't read the value
var blockGroupLength = ReadValueLength(id);
if (blockGroupLength != -1)
{
_BlockGroupEndPosition = _StreamPosition + blockGroupLength;
}
_InBlockGroup = true;
_ClusterBlockGroupReferenceBlocks.Clear();
_ClusterBlockGroupBlockDuration = -1;
}
else if (Element.Compare(id, SimpleBlock.EbmlId))
{
var frameLength = ReadFrameLength(id);
if (_ClusterBlockTrackNumber == 1)
{
return(frameLength);
}
Read(frameLength);
}
else if (Element.Compare(id, EbmlCrc32Id))
{
// verify
ReadValue(id);
}
else if (Element.Compare(id, EbmlVoidId))
{
// ignore
ReadValue(id);
}
else
{
throw new NotImplementedException($"Unexpected ID '{BitAssistant.GetHexString(id)}' at stream offset '{_StreamPosition}'.");
}
}
else
{
if (Element.Compare(id, Block.EbmlId))
{
var frameLength = ReadFrameLength(id);
if (_ClusterBlockTrackNumber == 1)
{
return(frameLength);
}
Skip(frameLength);
}
else if (Element.Compare(id, EbmlBlockGroupReferenceBlockId))
{
_ClusterBlockGroupReferenceBlocks.Add(Element.ReadSignedInteger(ReadValue(id)));
}
else if (Element.Compare(id, EbmlBlockGroupBlockDurationId))
{
_ClusterBlockGroupBlockDuration = Element.ReadSignedInteger(ReadValue(id));
}
else if (Element.Compare(id, new byte[] { 0x75, 0xA1 }))
{
//TODO: BlockAdditions
ReadValue(id);
}
else if (Element.Compare(id, EbmlCrc32Id))
{
// verify
ReadValue(id);
}
else if (Element.Compare(id, EbmlVoidId))
{
// ignore
ReadValue(id);
}
else
{
throw new NotImplementedException($"Unexpected ID '{BitAssistant.GetHexString(id)}' at stream offset '{_StreamPosition}'.");
}
}
}
}
