////------------------------------------------------------------------------------------------------------------------------------
public static FlacRicePartition Read(StreamBuffer sb, int partitionNumber, int partitionOrder, int predictOrder, int blockSize, FlacResidualCodingMethod codingMethod)
{
FlacRicePartition ricePartition = new FlacRicePartition { _riceParameter = sb.ReadBigEndianInt32(), _codingMethod = codingMethod };
int riceParameter = ricePartition._riceParameter & ((codingMethod == FlacResidualCodingMethod.PartitionedRice) ? 0x1F : 0xF);
if (partitionOrder == 0)
ricePartition.Samples = blockSize - predictOrder;
else if (partitionNumber == 0)
ricePartition.Samples = (blockSize >> partitionOrder) - predictOrder;
else
ricePartition.Samples = blockSize >> partitionOrder;
ricePartition.Residuals = new int[ricePartition.Samples];
if ((riceParameter < 0xF) || ((codingMethod == FlacResidualCodingMethod.PartitionedRice2) && (riceParameter < 0x1F)))
{
for (int i = 0; i < ricePartition.Samples; i++)
{
long msbs = sb.ReadUnaryInt();
long lsbs = sb.ReadBigEndianInt32() & (0xFFFFFFFF >> (32 - riceParameter));
long value = (msbs << riceParameter) | lsbs;
ricePartition.Residuals[i] = ((value & 0x01) == 0x01) ? -((int)(value >> 1)) - 1 : (int)(value >> 1);
}
}
else
{
// residuals in unencoded form, sample size read from the next 5
// bits in the stream.
int size = sb.ReadBigEndianInt32();
for (int i = 0; i < ricePartition.Samples; i++)
ricePartition.Residuals[i] = sb.ReadBigEndianInt32();
}
return ricePartition;
}
