public new void Encode(RangeCoder.Encoder rangeEncoder, uint symbol, uint posState)
{
base.Encode(rangeEncoder, symbol, posState);
if (--_counters[posState] == 0)
{
UpdateTable(posState);
}
}
public void Encode(RangeCoder.Encoder rangeEncoder, byte symbol)
{
uint context = 1;
for (int i = 7; i >= 0; i--)
{
uint bit = (uint)((symbol >> i) & 1);
_encoders[context].Encode(rangeEncoder, bit);
context = (context << 1) | bit;
}
}
public void ReverseEncode(RangeCoder.Encoder rangeEncoder, uint symbol)
{
uint m = 1;
for (uint i = 0; i < NumBitLevels; i++)
{
uint bit = symbol & 1;
Models[m].Encode(rangeEncoder, bit);
m = (m << 1) | bit;
symbol >>= 1;
}
}
public void Encode(RangeCoder.Encoder rangeEncoder, uint symbol)
{
uint m = 1;
for (int bitIndex = NumBitLevels; bitIndex > 0;)
{
bitIndex--;
uint bit = (symbol >> bitIndex) & 1;
Models[m].Encode(rangeEncoder, bit);
m = (m << 1) | bit;
}
}
public static void ReverseEncode(BitEncoder[] Models, uint startIndex,
RangeCoder.Encoder rangeEncoder, int NumBitLevels, uint symbol)
{
uint m = 1;
for (int i = 0; i < NumBitLevels; i++)
{
uint bit = symbol & 1;
Models[startIndex + m].Encode(rangeEncoder, bit);
m = (m << 1) | bit;
symbol >>= 1;
}
}
public void EncodeMatched(RangeCoder.Encoder rangeEncoder, byte matchByte, byte symbol)
{
uint context = 1;
bool same = true;
for (int i = 7; i >= 0; i--)
{
uint bit = (uint)((symbol >> i) & 1);
uint state = context;
if (same)
{
uint matchBit = (uint)((matchByte >> i) & 1);
state += ((1 + matchBit) << 8);
same = (matchBit == bit);
}
_encoders[state].Encode(rangeEncoder, bit);
context = (context << 1) | bit;
}
}
public void Encode(RangeCoder.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 < RangeCoder.Encoder.kTopValue)
{
encoder.Range <<= 8;
encoder.ShiftLow();
}
}
