public uint Decode(RangeDecoder rangeDecoder)
{
uint newBound = (uint)(rangeDecoder.Range >> kNumBitModelTotalBits) * (uint)_prob;
if (rangeDecoder.Code < newBound)
{
rangeDecoder.Range = newBound;
_prob += (kBitModelTotal - _prob) >> kNumMoveBits;
if (rangeDecoder.Range < RangeDecoder.kTopValue)
{
rangeDecoder.Code = (rangeDecoder.Code << 8) | (byte)rangeDecoder._inStream.ReadByte();
rangeDecoder.Range <<= 8;
}
return(0);
}
else
{
rangeDecoder.Range -= newBound;
rangeDecoder.Code -= newBound;
_prob -= (_prob) >> kNumMoveBits;
if (rangeDecoder.Range < RangeDecoder.kTopValue)
{
rangeDecoder.Code = (rangeDecoder.Code << 8) | (byte)rangeDecoder._inStream.ReadByte();
rangeDecoder.Range <<= 8;
}
return(1);
}
}
public uint Decode(RangeDecoder rangeDecoder)
{
uint m = 1;
for (int bitIndex = _numBitLevels; bitIndex > 0; bitIndex--)
{
m = (m << 1) + _models[m].Decode(rangeDecoder);
}
return(m - ((uint)1 << _numBitLevels));
}
public uint ReverseDecode(RangeDecoder rangeDecoder)
{
uint m = 1;
uint symbol = 0;
for (int bitIndex = 0; bitIndex < _numBitLevels; bitIndex++)
{
uint bit = _models[m].Decode(rangeDecoder);
m <<= 1;
m += bit;
symbol |= (bit << bitIndex);
}
return(symbol);
}
public static uint ReverseDecode(RangeBitDecoder[] Models, UInt32 startIndex,
RangeDecoder rangeDecoder, int NumBitLevels)
{
uint m = 1;
uint symbol = 0;
for (int bitIndex = 0; bitIndex < NumBitLevels; bitIndex++)
{
uint bit = Models[startIndex + m].Decode(rangeDecoder);
m <<= 1;
m += bit;
symbol |= (bit << bitIndex);
}
return(symbol);
}
