void CodingConstraintsBox::writeBox(BitStream& bitstr) { writeFullBoxHeader(bitstr); bitstr.writeBits(mAllRefPicsIntra, 1); bitstr.writeBits(mIntraPredUsed, 1); bitstr.writeBits(mMaxRefPicUsed, 4); bitstr.writeBits(0, 26); // reserved int(26) updateSize(bitstr); }
int Golomb::encode(uint m, int value, BitStream& bs){ int q, r, i; int nbits = (int) floor(log2(m)) + 1; int err; if (value < 0 ) { value = 2*abs(value) - 1; } else { value *= 2; } q = value/m; r = value%m; for(i=0; i<q;i++) { if ((err = bs.writeBit(1))!= 0) return err; } if ((err = bs.writeBit(0))!= 0) return err; if ((err = bs.writeBits(r, nbits))!= 0){ return err; } return 0; }
void rbucEncodeCPUOneLevel(BitStream& bitStream, std::vector<Symbol16>& lengths, const std::vector<Symbol16>& symbols, uint branchFactor) { rbucEncodeCPUBuildLengthsOneLevel(lengths, symbols, branchFactor); uint symbolCount = (uint)symbols.size(); for(uint i = 0; i < symbolCount; i++) { uint length = lengths[i / branchFactor]; bitStream.writeBits(symbols[i], length); } }
bool huffmanEncodeCPU(BitStream& bitStream, const std::vector<Symbol16>& symbolStream, const HuffmanEncodeTableCPU& encodeTable, std::vector<uint>& offsets, uint codingBlockSize) { uint offsetBase = bitStream.getBitPosition(); for(uint i = 0; i < symbolStream.size(); i++) { if(codingBlockSize > 0 && i % codingBlockSize == 0) { offsets.push_back(bitStream.getBitPosition() - offsetBase); } Symbol16 symbol = symbolStream[i]; const HuffmanEntry& entry = encodeTable.m_encodeTable[symbol]; bitStream.writeBits(entry.m_codeword, entry.m_codewordLength); } return true; }
void rbucEncodeCPUWriteTree(BitStream& bitStream, std::vector<uint>& offsets, const std::vector<std::vector<Symbol16>>& tree, const std::vector<uint>& branchFactors, uint level, uint index) { if(level+2 == tree.size()) { offsets.push_back(bitStream.getBitPosition()); } uint bits = (level+1 >= tree.size() ? 8 : tree[level+1][index / branchFactors[level]]); bitStream.writeBits(tree[level][index], bits); if(level > 0) { uint branchFactor = branchFactors[level - 1]; uint childrenCount = std::min(branchFactor, (uint)tree[level - 1].size() - index * branchFactor); for(uint i = 0; i < childrenCount; i++) { rbucEncodeCPUWriteTree(bitStream, offsets, tree, branchFactors, level - 1, index * branchFactor + i); } } }