public void Encode(Encoder rangeEncoder, UInt32 symbol) {
UInt32 m = 1;
for (int bitIndex = NumBitLevels; bitIndex > 0;) {
bitIndex--;
UInt32 bit = (symbol >> bitIndex) & 1;
Models[m].Encode(rangeEncoder, bit);
m = (m << 1) | bit;
}
}
public void ReverseEncode(Encoder rangeEncoder, UInt32 symbol) {
UInt32 m = 1;
for (UInt32 i = 0; i < NumBitLevels; i++) {
UInt32 bit = symbol & 1;
Models[m].Encode(rangeEncoder, bit);
m = (m << 1) | bit;
symbol >>= 1;
}
}
public static void ReverseEncode(BitEncoder[] Models, UInt32 startIndex,
Encoder rangeEncoder, int NumBitLevels, UInt32 symbol) {
UInt32 m = 1;
for (int i = 0; i < NumBitLevels; i++) {
UInt32 bit = symbol & 1;
Models[startIndex + m].Encode(rangeEncoder, bit);
m = (m << 1) | bit;
symbol >>= 1;
}
}
public void Encode(Encoder encoder, uint symbol) {
// encoder.EncodeBit(Prob, kNumBitModelTotalBits, symbol);
// UpdateModel(symbol);
uint newBound = (encoder.Range >> kNumBitModelTotalBits) * Prob;
if (symbol == 0) {
encoder.Range = newBound;
Prob += (kBitModelTotal - Prob) >> kNumMoveBits;
}
else {
encoder.Low += newBound;
encoder.Range -= newBound;
Prob -= (Prob) >> kNumMoveBits;
}
if (encoder.Range < Encoder.kTopValue) {
encoder.Range <<= 8;
encoder.ShiftLow();
}
}