private unsafe void ReadSubFrames(int *ptrDestBuffer, int *ptrResidualBuffer)
{
List <FlacSubFrameBase> subFrames = new List <FlacSubFrameBase>();
//alocateOutput
var data = AllocOuputMemory(ptrDestBuffer, ptrResidualBuffer);
_subFrameData = data;
byte[] buffer = new byte[0x20000];
if ((_streamInfo.MaxFrameSize * Header.Channels * Header.BitsPerSample * 2 >> 3) > buffer.Length)
{
buffer = new byte[(_streamInfo.MaxFrameSize * Header.Channels * Header.BitsPerSample * 2 >> 3) - FlacConstant.FrameHeaderSize];
}
int read = _stream.Read(buffer, 0, (int)Math.Min(buffer.Length, _stream.Length - _stream.Position));
fixed(byte *ptrBuffer = buffer)
{
FlacBitReader reader = new FlacBitReader(ptrBuffer, 0);
for (int c = 0; c < Header.Channels; c++)
{
int bitsPerSample = Header.BitsPerSample;
if (Header.ChannelAssignment == ChannelAssignment.MidSide || Header.ChannelAssignment == ChannelAssignment.LeftSide)
{
bitsPerSample += c;
}
else if (Header.ChannelAssignment == ChannelAssignment.RightSide)
{
bitsPerSample += 1 - c;
}
var subframe = FlacSubFrameBase.GetSubFrame(reader, data[c], Header, bitsPerSample);
subFrames.Add(subframe);
}
reader.Flush(); //Zero-padding to byte alignment.
//footer
Crc16 = (short)reader.ReadBits(16);
_stream.Position -= read - reader.Position;
MapToChannels(_subFrameData);
}
#if FLAC_DEBUG
_subFrames = subFrames.AsReadOnly();
#endif
}
private unsafe int ReadSubFrames()
{
List <FlacSubFrameBase> subFrames = new List <FlacSubFrameBase>();
//alocateOutput
var data = AllocOuputMemory();
_data = data;
byte[] buffer = new byte[0x20000];
if ((_streamInfo.MaxFrameSize * Header.Channels * Header.BitsPerSample * 2 >> 3) > buffer.Length)
{
buffer = new byte[(_streamInfo.MaxFrameSize * Header.Channels * Header.BitsPerSample * 2 >> 3) - FlacConstant.FrameHeaderSize];
}
int read = _stream.Read(buffer, 0, (int)Math.Min(buffer.Length, _stream.Length - _stream.Position));
fixed(byte *ptrBuffer = buffer)
{
FlacBitReader reader = new FlacBitReader(ptrBuffer, 0);
ChannelAssignment channelAssignment = Header.ChannelAssignment;
for (int c = 0; c < Header.Channels; c++)
{
int bps = Header.BitsPerSample;
if (Header.ChannelAssignment == ChannelAssignment.MidSide || Header.ChannelAssignment == ChannelAssignment.LeftSide)
{
bps += c;
}
else if (Header.ChannelAssignment == ChannelAssignment.RightSide)
{
bps += 1 - c;
}
var subframe = FlacSubFrameBase.GetSubFrame(reader, data[c], Header, bps);
subFrames.Add(subframe);
}
reader.Flush();
CRC16 = (ushort)reader.ReadBits(16);
_stream.Position -= read - reader.Position;
SamplesToBytes(_data);
return(reader.Position);
}
}
public unsafe static FlacSubFrameBase GetSubFrame(FlacBitReader reader, FlacSubFrameData data, FlacFrameHeader header, int bps)
{
uint x;
int wastedBits = 0, totalBits = 0, order = 0;
x = reader.ReadBits(8);
bool haswastedBits = (x & 1) != 0;
x &= 0xFE; //1111 1110
if (haswastedBits)
{
int u = (int)reader.ReadUnary();
wastedBits = u + 1;
bps -= wastedBits;
totalBits = bps;
}
if ((x & 0x80) != 0)
{
Debug.WriteLine("Flacdecoder lost sync while reading FlacSubFrameHeader. [x & 0x80].");
return(null);
}
FlacSubFrameBase subFrame = null;
if ((x > 2 && x < 16) ||
(x > 24 && x < 64))
{
Debug.WriteLine("Invalid FlacSubFrameHeader. [" + x.ToString("x") + "]");
return(null);
}
else if (x == 0)
{
subFrame = new FlacSubFrameConstant(reader, header, data, bps);
}
else if (x == 2)
{
//verbatim
subFrame = new FlacSubFrameVerbatim(reader, header, data, bps);
}
else if (x >= 16 && x <= 24)
{
//fixed
order = (int)((x >> 1) & 7);
subFrame = new FlacSubFrameFixed(reader, header, data, bps, order);
}
else if (x >= 64)
{
//lpc
order = (int)(((x >> 1) & 31) + 1);
subFrame = new FlacSubFrameLPC(reader, header, data, bps, order);
}
else
{
Debug.WriteLine("Invalid Flac-SubframeType: x = " + x + ".");
return(null);
}
if (haswastedBits)
{
int *ptrDest = data.destBuffer;
for (int i = 0; i < header.BlockSize; i++)
{
*(ptrDest++) <<= wastedBits;
}
}
//System.Diagnostics.Debug.WriteLine(subFrame.GetType().Name);
if (subFrame != null)
{
subFrame.WastedBits = wastedBits;
}
else
{
Debug.WriteLine("Unknown error while reading FlacSubFrameHeader");
}
return(subFrame);
}