void CodingConstraintsBox::parseBox(BitStream& bitstr)
{
parseFullBoxHeader(bitstr);
mAllRefPicsIntra = bitstr.readBits(1);
mIntraPredUsed = bitstr.readBits(1);
mMaxRefPicUsed = bitstr.readBits(4);
bitstr.readBits(26); // discard reserved int(26)
}
int Golomb::decode(uint m, int *value, BitStream& bs){
int q = 0, r, v;
int nbits = (int) floor(log2(m)) + 1;
int err;
uint32_t bit;
do {
if ((err=bs.readBit(&bit)) != 0)
return err;
if (bit == 0)
break;
q++;
} while(true);
if ((err = bs.readBits(nbits, &bit)) != 0)
return err;
r = (int) bit;
v = q * m + r;
if (v % 2 == 0)
*value = v/2;
else
*value = -(v+1)/2;
return 0;
}
void rbucDecodeCPUOneLevel(BitStream& bitStream, const std::vector<Symbol16>& lengths, std::vector<Symbol16>& symbols, uint symbolCount, uint branchFactor)
{
for(uint i = 0; i < symbolCount; i++) {
uint length = lengths[i / branchFactor];
uint symbol = 0;
bitStream.readBits(symbol, length);
symbols.push_back(symbol);
}
}