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 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 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);
}
}
