public FlacResidual(FlacBitReader reader, FlacFrameHeader header, FlacSubFrameData data, int order)
{
FlacEntropyCoding codingMethod = (FlacEntropyCoding)reader.ReadBits(FlacConstant.ENTROPY_CODING_METHOD_TYPE_LEN); // 2 Bit
int riceOrder = -1;
if (codingMethod == FlacEntropyCoding.PartitionedRice || codingMethod == FlacEntropyCoding.PartitionedRice2)
{
riceOrder = (int)reader.ReadBits(FlacConstant.ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN); // 4 Bit
FlacPartitionedRice rice = new FlacPartitionedRice(riceOrder, codingMethod, data.Content);
if (rice.ProcessResidual(reader, header, data, order) == false)
{
throw new FlacException("Decoding Flac Residual failed.", FlacLayer.SubFrame);
}
CodingMethod = codingMethod;
RiceOrder = riceOrder;
Rice = rice;
}
else
{
throw new FlacException("Not supported RICE-Coding-Method. Stream unparseable!", FlacLayer.SubFrame);
}
}
public FlacResidual(FlacBitReader reader, FlacFrameHeader header, FlacSubFrameData data, int order)
{
FlacEntropyCoding codingMethod = (FlacEntropyCoding)reader.ReadBits(FlacConstant.EntropyCodingMethodTypeLen); // 2 Bit
if (codingMethod == FlacEntropyCoding.PartitionedRice || codingMethod == FlacEntropyCoding.PartitionedRice2)
{
int riceOrder = (int)reader.ReadBits(FlacConstant.EntropyCodingMethodPartitionedRiceOrderLen);
FlacPartitionedRice rice = new FlacPartitionedRice(riceOrder, codingMethod, data.Content);
if (rice.ProcessResidual(reader, header, data, order) == false)
{
throw new FlacException("Decoding Flac Residual failed.", FlacLayer.SubFrame);
}
#if DEBUG
CodingMethod = codingMethod;
RiceOrder = riceOrder;
Rice = rice;
#endif
}
else
{
throw new FlacException("Not supported RICE-Coding-Method. Stream unparseable!", FlacLayer.SubFrame);
}
}
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 FlacPartitionedRice(int partitionOrder, FlacEntropyCoding codingMethod, FlacPartitionedRiceContent content)
{
PartitionOrder = partitionOrder;
CodingMethod = codingMethod;
Content = content;
}
public FlacPartitionedRice(int partitionOrder, FlacEntropyCoding codingMethod, FlacPartitionedRiceContent content)
{
PartitionOrder = partitionOrder;
CodingMethod = codingMethod;
Content = content;
}
