private unsafe List <FlacSubFrameData> AllocOuputMemory()
{
if (_destBuffer == null || _destBuffer.Length < (Header.Channels * Header.BlockSize))
{
_destBuffer = new int[Header.Channels * Header.BlockSize];
}
if (_residualBuffer == null || _residualBuffer.Length < (Header.Channels * Header.BlockSize))
{
_residualBuffer = new int[Header.Channels * Header.BlockSize];
}
List <FlacSubFrameData> output = new List <FlacSubFrameData>();
for (int c = 0; c < Header.Channels; c++)
{
fixed(int *ptrDestBuffer = _destBuffer, ptrResidualBuffer = _residualBuffer)
{
FreeBuffers();
_handle1 = GCHandle.Alloc(_destBuffer, GCHandleType.Pinned);
_handle2 = GCHandle.Alloc(_residualBuffer, GCHandleType.Pinned);
FlacSubFrameData data = new FlacSubFrameData
{
DestBuffer = (ptrDestBuffer + c * Header.BlockSize),
ResidualBuffer = (ptrResidualBuffer + c * Header.BlockSize)
};
output.Add(data);
}
}
return(output);
}
public unsafe FlacSubFrameLPC(FlacBitReader reader, FlacFrameHeader header, FlacSubFrameData data, int bps, int order)
: base(header)
{
//warmup
_warmup = new int[FlacConstant.MaxLpcOrder];
for (int i = 0; i < order; i++)
{
_warmup[i] = data.ResidualBuffer[i] = reader.ReadBitsSigned(bps);
}
//header
int u32 = (int)reader.ReadBits(FlacConstant.SubframeLpcQlpCoeffPrecisionLen);
if (u32 == (1 << FlacConstant.SubframeLpcQlpCoeffPrecisionLen) - 1)
{
Debug.WriteLine("Invalid FlacLPC qlp coeff precision.");
return; //return false;
}
_qlpCoeffPrecision = u32 + 1;
int level = reader.ReadBitsSigned(FlacConstant.SubframeLpcQlpShiftLen);
if (level < 0)
throw new Exception("negative shift");
_lpcShiftNeeded = level;
_qlpCoeffs = new int[FlacConstant.MaxLpcOrder];
//qlp coeffs
for (int i = 0; i < order; i++)
{
_qlpCoeffs[i] = reader.ReadBitsSigned(_qlpCoeffPrecision);
}
Residual = new FlacResidual(reader, header, data, order);
for (int i = 0; i < order; i++)
{
data.DestBuffer[i] = data.ResidualBuffer[i];
}
int i1 = order;
int result = 0;
while ((i1 >>= 1) != 0)
{
result++;
}
if (bps + _qlpCoeffPrecision + result <= 32)
{
if (bps <= 16 && _qlpCoeffPrecision <= 16)
RestoreLPCSignal(data.ResidualBuffer + order, data.DestBuffer + order, header.BlockSize - order, order); //Restore(data.residualBuffer + order, data.destBuffer, Header.BlockSize - order, order, order);
else
RestoreLPCSignal(data.ResidualBuffer + order, data.DestBuffer + order, header.BlockSize - order, order);
}
else
{
RestoreLPCSignalWide(data.ResidualBuffer + order, data.DestBuffer + order, header.BlockSize - order, order);//RestoreWide(data.residualBuffer + order, data.destBuffer, Header.BlockSize - order, order, order);
}
}
public unsafe FlacSubFrameFixed(FlacBitReader reader, FlacFrameHeader header, FlacSubFrameData data, int bps, int order)
: base(header)
{
for (int i = 0; i < order; i++)
{
data.ResidualBuffer[i] = data.DestBuffer[i] = reader.ReadBitsSigned(bps);
}
Residual = new FlacResidual(reader, header, data, order); //necessary for decoding
RestoreSignal(data, header.BlockSize - order, order);
}
public unsafe bool ProcessResidual(FlacBitReader reader, FlacFrameHeader header, FlacSubFrameData data, int order)
{
data.Content.UpdateSize(PartitionOrder);
int porder = PartitionOrder;
FlacEntropyCoding codingMethod = CodingMethod;
int psize = header.BlockSize >> porder;
int resCnt = psize - order;
int ricelength = 4 + (int)codingMethod; //4bit = RICE I | 5bit = RICE II
//residual
int j = order;
int* r = data.ResidualBuffer + j;
int partitioncount = 1 << porder;
for (int p = 0; p < partitioncount; p++)
{
if (p == 1) resCnt = psize;
int n = Math.Min(resCnt, header.BlockSize - j);
int k = Content.Parameters[p] = (int)reader.ReadBits(ricelength);
if (k == (1 << ricelength) - 1)
{
k = (int)reader.ReadBits(5);
for (int i = n; i > 0; i--)
{
*(r) = reader.ReadBitsSigned((int)k);
}
}
else
{
ReadFlacRiceBlock(reader, n, (int)k, r);
r += n;
}
j += n;
}
return true;
}
public unsafe bool ProcessResidual(FlacBitReader reader, FlacFrameHeader header, FlacSubFrameData data, int order)
{
data.Content.UpdateSize(PartitionOrder);
int porder = PartitionOrder;
FlacEntropyCoding codingMethod = CodingMethod;
int psize = header.BlockSize >> porder;
int resCnt = psize - order;
int ricelength = 4 + (int)codingMethod; //4bit = RICE I | 5bit = RICE II
//residual
int j = order;
int *r = data.ResidualBuffer + j;
int partitioncount = 1 << porder;
for (int p = 0; p < partitioncount; p++)
{
if (p == 1)
{
resCnt = psize;
}
int n = Math.Min(resCnt, header.BlockSize - j);
int k = Content.Parameters[p] = (int)reader.ReadBits(ricelength);
if (k == (1 << ricelength) - 1)
{
k = (int)reader.ReadBits(5);
for (int i = n; i > 0; i--)
{
*(r) = reader.ReadBitsSigned((int)k);
}
}
else
{
ReadFlacRiceBlock(reader, n, (int)k, r);
r += n;
}
j += n;
}
return(true);
}
public unsafe FlacSubFrameFixed(FlacBitReader reader, FlacFrameHeader header, FlacSubFrameData data, int bps, int order)
: base(header)
{
for (int i = 0; i < order; i++)
{
data.ResidualBuffer[i] = data.DestBuffer[i] = reader.ReadBitsSigned(bps);
}
Residual = new FlacResidual(reader, header, data, order); //necessary for decoding
RestoreSignal(data, header.BlockSize - order, order);
}
//http://www.hpl.hp.com/techreports/1999/HPL-1999-144.pdf
private unsafe bool RestoreSignal(FlacSubFrameData subframeData, int length, int predictorOrder)
{
int *residual = subframeData.ResidualBuffer + predictorOrder;
int *data = subframeData.DestBuffer + predictorOrder;
int t0, t1, t2; //temp
switch (predictorOrder)
{
case 0:
for (int i = 0; i < length; i++)
{
*(data++) = *(residual++);
}
break;
case 1:
t1 = data[-1];
for (int i = 0; i < length; i++)
{
t1 += *(residual++);
*(data++) = t1;
}
break;
case 2:
t2 = data[-2];
t1 = data[-1];
for (int i = 0; i < length; i++)
{
*(data++) = t0 = ((t1 << 1) + *(residual++)) - t2;
t2 = t1;
t1 = t0;
}
break;
case 3:
for (int i = 0; i < length; i++)
{
*(data) = *(residual) +
(((data[-1] - data[-2]) << 1) + (data[-1] - data[-2])) +
data[-3];
data++;
residual++;
}
break;
case 4:
for (int i = 0; i < length; i++)
{
*(data) = *(residual) +
((data[-1] + data[-3]) << 2) -
((data[-2] << 2) + (data[-2] << 1)) -
data[-4];
data++;
residual++;
}
break;
default:
Debug.WriteLine("Invalid FlacFixedSubFrame predictororder.");
return(false);
}
return(true);
}
public unsafe FlacSubFrameLPC(FlacBitReader reader, FlacFrameHeader header, FlacSubFrameData data, int bps, int order)
: base(header)
{
//warmup
_warmup = new int[FlacConstant.MaxLpcOrder];
for (int i = 0; i < order; i++)
{
_warmup[i] = data.ResidualBuffer[i] = reader.ReadBitsSigned(bps);
}
//header
int u32 = (int)reader.ReadBits(FlacConstant.SubframeLpcQlpCoeffPrecisionLen);
if (u32 == (1 << FlacConstant.SubframeLpcQlpCoeffPrecisionLen) - 1)
{
Debug.WriteLine("Invalid FlacLPC qlp coeff precision.");
return; //return false;
}
_qlpCoeffPrecision = u32 + 1;
int level = reader.ReadBitsSigned(FlacConstant.SubframeLpcQlpShiftLen);
if (level < 0)
{
throw new Exception("negative shift");
}
_lpcShiftNeeded = level;
_qlpCoeffs = new int[FlacConstant.MaxLpcOrder];
//qlp coeffs
for (int i = 0; i < order; i++)
{
_qlpCoeffs[i] = reader.ReadBitsSigned(_qlpCoeffPrecision);
}
Residual = new FlacResidual(reader, header, data, order);
for (int i = 0; i < order; i++)
{
data.DestBuffer[i] = data.ResidualBuffer[i];
}
int i1 = order;
int result = 0;
while ((i1 >>= 1) != 0)
{
result++;
}
if (bps + _qlpCoeffPrecision + result <= 32)
{
if (bps <= 16 && _qlpCoeffPrecision <= 16)
{
RestoreLPCSignal(data.ResidualBuffer + order, data.DestBuffer + order, header.BlockSize - order, order); //Restore(data.residualBuffer + order, data.destBuffer, Header.BlockSize - order, order, order);
}
else
{
RestoreLPCSignal(data.ResidualBuffer + order, data.DestBuffer + order, header.BlockSize - order, order);
}
}
else
{
RestoreLPCSignalWide(data.ResidualBuffer + order, data.DestBuffer + order, header.BlockSize - order, order);//RestoreWide(data.residualBuffer + order, data.destBuffer, Header.BlockSize - order, order, order);
}
}
private unsafe List<FlacSubFrameData> AllocOuputMemory()
{
if (_destBuffer == null || _destBuffer.Length < (Header.Channels * Header.BlockSize))
_destBuffer = new int[Header.Channels * Header.BlockSize];
if (_residualBuffer == null || _residualBuffer.Length < (Header.Channels * Header.BlockSize))
_residualBuffer = new int[Header.Channels * Header.BlockSize];
List<FlacSubFrameData> output = new List<FlacSubFrameData>();
for (int c = 0; c < Header.Channels; c++)
{
fixed (int* ptrDestBuffer = _destBuffer, ptrResidualBuffer = _residualBuffer)
{
_handle1 = GCHandle.Alloc(_destBuffer, GCHandleType.Pinned);
_handle2 = GCHandle.Alloc(_residualBuffer, GCHandleType.Pinned);
FlacSubFrameData data = new FlacSubFrameData
{
DestBuffer = (ptrDestBuffer + c * Header.BlockSize),
ResidualBuffer = (ptrResidualBuffer + c * Header.BlockSize)
};
output.Add(data);
}
}
return output;
}
public unsafe static FlacSubFrameBase GetSubFrame(FlacBitReader reader, FlacSubFrameData data, FlacFrameHeader header, int bps)
{
int wastedBits = 0, order = 0;
uint 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;
}
if ((x & 0x80) != 0)
{
Debug.WriteLine("Flacdecoder lost sync while reading FlacSubFrameHeader. [x & 0x80].");
return null;
}
FlacSubFrameBase subFrame;
if ((x > 2 && x < 16) ||
(x > 24 && x < 64))
{
Debug.WriteLine("Invalid FlacSubFrameHeader. [" + x.ToString("x") + "]");
return null;
}
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);
//check null removed
subFrame.WastedBits = wastedBits;
return subFrame;
}
//http://www.hpl.hp.com/techreports/1999/HPL-1999-144.pdf
private unsafe bool RestoreSignal(FlacSubFrameData subframeData, int length, int predictorOrder)
{
int* residual = subframeData.ResidualBuffer + predictorOrder;
int* data = subframeData.DestBuffer + predictorOrder;
int t0, t1, t2; //temp
switch (predictorOrder)
{
case 0:
for (int i = 0; i < length; i++)
{
*(data++) = *(residual++);
}
break;
case 1:
t1 = data[-1];
for (int i = 0; i < length; i++)
{
t1 += *(residual++);
*(data++) = t1;
}
break;
case 2:
t2 = data[-2];
t1 = data[-1];
for (int i = 0; i < length; i++)
{
*(data++) = t0 = ((t1 << 1) + *(residual++)) - t2;
t2 = t1;
t1 = t0;
}
break;
case 3:
for (int i = 0; i < length; i++)
{
*(data) = *(residual) +
(((data[-1] - data[-2]) << 1) + (data[-1] - data[-2])) +
data[-3];
data++;
residual++;
}
break;
case 4:
for (int i = 0; i < length; i++)
{
*(data) = *(residual) +
((data[-1] + data[-3]) << 2) -
((data[-2] << 2) + (data[-2] << 1)) -
data[-4];
data++;
residual++;
}
break;
default:
Debug.WriteLine("Invalid FlacFixedSubFrame predictororder.");
return false;
}
return true;
}
public unsafe static FlacSubFrameBase GetSubFrame(FlacBitReader reader, FlacSubFrameData data, FlacFrameHeader header, int bps)
{
int wastedBits = 0, order = 0;
uint 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;
}
if ((x & 0x80) != 0)
{
Debug.WriteLine("Flacdecoder lost sync while reading FlacSubFrameHeader. [x & 0x80].");
return(null);
}
FlacSubFrameBase subFrame;
if ((x > 2 && x < 16) ||
(x > 24 && x < 64))
{
Debug.WriteLine("Invalid FlacSubFrameHeader. [" + x.ToString("x") + "]");
return(null);
}
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);
//check null removed
subFrame.WastedBits = wastedBits;
return(subFrame);
}
