/***************************************************************************** * Copyright (C) 2013 x265 project * * Authors: Steve Borho * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA. * * This program is also available under a commercial proprietary license. * For more information, contact us at license @ x265.com. *****************************************************************************/ #ifndef X265_ENTROPY_H #define X265_ENTROPY_H #include "common.h" #include "bitstream.h" #include "frame.h" #include "cudata.h" #include "contexts.h" #include "slice.h" namespace X265_NS { // private namespace struct SaoCtuParam; struct EstBitsSbac; class ScalingList; enum SplitType { DONT_SPLIT = 0, VERTICAL_SPLIT = 1, QUAD_SPLIT = 2, NUMBER_OF_SPLIT_MODES = 3 }; struct TURecurse { uint32_t section; uint32_t splitMode; uint32_t absPartIdxTURelCU; uint32_t absPartIdxStep; TURecurse(SplitType splitType, uint32_t _absPartIdxStep, uint32_t _absPartIdxTU) { static const uint32_t partIdxStepShift[NUMBER_OF_SPLIT_MODES] = { 0, 1, 2 }; section = 0; absPartIdxTURelCU = _absPartIdxTU; splitMode = (uint32_t)splitType; absPartIdxStep = _absPartIdxStep >> partIdxStepShift[splitMode]; } bool isNextSection() { if (splitMode == DONT_SPLIT) { section++; return false; } else { absPartIdxTURelCU += absPartIdxStep; section++; return section < (uint32_t)(1 << splitMode); } } bool isLastSection() const { return (section + 1) >= (uint32_t)(1 << splitMode); } }; struct EstBitsSbac { int significantCoeffGroupBits[NUM_SIG_CG_FLAG_CTX][2]; int significantBits[2][NUM_SIG_FLAG_CTX]; int lastBits[2][10]; int greaterOneBits[NUM_ONE_FLAG_CTX][2]; int levelAbsBits[NUM_ABS_FLAG_CTX][2]; int blockCbpBits[NUM_QT_CBF_CTX][2]; int blockRootCbpBits[2]; }; class Entropy : public SyntaxElementWriter { public: uint64_t m_pad; uint8_t m_contextState[160]; // MAX_OFF_CTX_MOD + padding /* CABAC state */ uint32_t m_low; uint32_t m_range; uint32_t m_bufferedByte; int m_numBufferedBytes; int m_bitsLeft; uint64_t m_fracBits; EstBitsSbac m_estBitsSbac; Entropy(); void setBitstream(Bitstream* p) { m_bitIf = p; } uint32_t getNumberOfWrittenBits() { X265_CHECK(!m_bitIf, "bit counting mode expected\n"); return (uint32_t)(m_fracBits >> 15); } #if CHECKED_BUILD || _DEBUG bool m_valid; void markInvalid() { m_valid = false; } void markValid() { m_valid = true; } #else void markValid() { } #endif void zeroFract() { m_fracBits = 0; } void resetBits(); void resetEntropy(const Slice& slice); // SBAC RD void load(const Entropy& src) { copyFrom(src); } void store(Entropy& dest) const { dest.copyFrom(*this); } void loadContexts(const Entropy& src) { copyContextsFrom(src); } void loadIntraDirModeLuma(const Entropy& src); void copyState(const Entropy& other); void codeVPS(const VPS& vps); void codeSPS(const SPS& sps, const ScalingList& scalingList, const ProfileTierLevel& ptl); void codePPS(const PPS& pps); void codeVUI(const VUI& vui, int maxSubTLayers); void codeAUD(const Slice& slice); void codeHrdParameters(const HRDInfo& hrd, int maxSubTLayers); void codeSliceHeader(const Slice& slice, FrameData& encData); void codeSliceHeaderWPPEntryPoints(const Slice& slice, const uint32_t *substreamSizes, uint32_t maxOffset); void codeShortTermRefPicSet(const RPS& rps); void finishSlice() { encodeBinTrm(1); finish(); dynamic_cast(m_bitIf)->writeByteAlignment(); } void encodeCTU(const CUData& cu, const CUGeom& cuGeom); void codeIntraDirLumaAng(const CUData& cu, uint32_t absPartIdx, bool isMultiple); void codeIntraDirChroma(const CUData& cu, uint32_t absPartIdx, uint32_t *chromaDirMode); void codeMergeIndex(const CUData& cu, uint32_t absPartIdx); void codeMvd(const CUData& cu, uint32_t absPartIdx, int list); void codePartSize(const CUData& cu, uint32_t absPartIdx, uint32_t depth); void codePredInfo(const CUData& cu, uint32_t absPartIdx); inline void codeQtCbfLuma(const CUData& cu, uint32_t absPartIdx, uint32_t tuDepth) { codeQtCbfLuma(cu.getCbf(absPartIdx, TEXT_LUMA, tuDepth), tuDepth); } void codeQtCbfChroma(const CUData& cu, uint32_t absPartIdx, TextType ttype, uint32_t tuDepth, bool lowestLevel); void codeCoeff(const CUData& cu, uint32_t absPartIdx, bool& bCodeDQP, const uint32_t depthRange[2]); void codeCoeffNxN(const CUData& cu, const coeff_t* coef, uint32_t absPartIdx, uint32_t log2TrSize, TextType ttype); inline void codeSaoMerge(uint32_t code) { encodeBin(code, m_contextState[OFF_SAO_MERGE_FLAG_CTX]); } inline void codeMVPIdx(uint32_t symbol) { encodeBin(symbol, m_contextState[OFF_MVP_IDX_CTX]); } inline void codeMergeFlag(const CUData& cu, uint32_t absPartIdx) { encodeBin(cu.m_mergeFlag[absPartIdx], m_contextState[OFF_MERGE_FLAG_EXT_CTX]); } inline void codeSkipFlag(const CUData& cu, uint32_t absPartIdx) { encodeBin(cu.isSkipped(absPartIdx), m_contextState[OFF_SKIP_FLAG_CTX + cu.getCtxSkipFlag(absPartIdx)]); } inline void codeSplitFlag(const CUData& cu, uint32_t absPartIdx, uint32_t depth) { encodeBin(cu.m_cuDepth[absPartIdx] > depth, m_contextState[OFF_SPLIT_FLAG_CTX + cu.getCtxSplitFlag(absPartIdx, depth)]); } inline void codeTransformSubdivFlag(uint32_t symbol, uint32_t ctx) { encodeBin(symbol, m_contextState[OFF_TRANS_SUBDIV_FLAG_CTX + ctx]); } inline void codePredMode(int predMode) { encodeBin(predMode == MODE_INTRA ? 1 : 0, m_contextState[OFF_PRED_MODE_CTX]); } inline void codeCUTransquantBypassFlag(uint32_t symbol) { encodeBin(symbol, m_contextState[OFF_TQUANT_BYPASS_FLAG_CTX]); } inline void codeQtCbfLuma(uint32_t cbf, uint32_t tuDepth) { encodeBin(cbf, m_contextState[OFF_QT_CBF_CTX + !tuDepth]); } inline void codeQtCbfChroma(uint32_t cbf, uint32_t tuDepth) { encodeBin(cbf, m_contextState[OFF_QT_CBF_CTX + 2 + tuDepth]); } inline void codeQtRootCbf(uint32_t cbf) { encodeBin(cbf, m_contextState[OFF_QT_ROOT_CBF_CTX]); } inline void codeTransformSkipFlags(uint32_t transformSkip, TextType ttype) { encodeBin(transformSkip, m_contextState[OFF_TRANSFORMSKIP_FLAG_CTX + (ttype ? NUM_TRANSFORMSKIP_FLAG_CTX : 0)]); } void codeDeltaQP(const CUData& cu, uint32_t absPartIdx); void codeSaoOffset(const SaoCtuParam& ctuParam, int plane); /* RDO functions */ void estBit(EstBitsSbac& estBitsSbac, uint32_t log2TrSize, bool bIsLuma) const; void estCBFBit(EstBitsSbac& estBitsSbac) const; void estSignificantCoeffGroupMapBit(EstBitsSbac& estBitsSbac, bool bIsLuma) const; void estSignificantMapBit(EstBitsSbac& estBitsSbac, uint32_t log2TrSize, bool bIsLuma) const; void estSignificantCoefficientsBit(EstBitsSbac& estBitsSbac, bool bIsLuma) const; inline uint32_t bitsIntraModeNonMPM() const { return bitsCodeBin(0, m_contextState[OFF_ADI_CTX]) + 5; } inline uint32_t bitsIntraModeMPM(const uint32_t preds[3], uint32_t dir) const { return bitsCodeBin(1, m_contextState[OFF_ADI_CTX]) + (dir == preds[0] ? 1 : 2); } inline uint32_t estimateCbfBits(uint32_t cbf, TextType ttype, uint32_t tuDepth) const { return bitsCodeBin(cbf, m_contextState[OFF_QT_CBF_CTX + ctxCbf[ttype][tuDepth]]); } uint32_t bitsInterMode(const CUData& cu, uint32_t absPartIdx, uint32_t depth) const; uint32_t bitsIntraMode(const CUData& cu, uint32_t absPartIdx) const { return bitsCodeBin(0, m_contextState[OFF_SKIP_FLAG_CTX + cu.getCtxSkipFlag(absPartIdx)]) + /* not skip */ bitsCodeBin(1, m_contextState[OFF_PRED_MODE_CTX]); /* intra */ } /* these functions are only used to estimate the bits when cbf is 0 and will never be called when writing the bistream. */ inline void codeQtRootCbfZero() { encodeBin(0, m_contextState[OFF_QT_ROOT_CBF_CTX]); } private: /* CABAC private methods */ void start(); void finish(); void encodeBin(uint32_t binValue, uint8_t& ctxModel); void encodeBinEP(uint32_t binValue); void encodeBinsEP(uint32_t binValues, int numBins); void encodeBinTrm(uint32_t binValue); /* return the bits of encoding the context bin without updating */ inline uint32_t bitsCodeBin(uint32_t binValue, uint32_t ctxModel) const { uint64_t fracBits = (m_fracBits & 32767) + sbacGetEntropyBits(ctxModel, binValue); return (uint32_t)(fracBits >> 15); } void encodeCU(const CUData& ctu, const CUGeom &cuGeom, uint32_t absPartIdx, uint32_t depth, bool& bEncodeDQP); void finishCU(const CUData& ctu, uint32_t absPartIdx, uint32_t depth, bool bEncodeDQP); void writeOut(); /* SBac private methods */ void writeUnaryMaxSymbol(uint32_t symbol, uint8_t* scmModel, int offset, uint32_t maxSymbol); void writeEpExGolomb(uint32_t symbol, uint32_t count); void writeCoefRemainExGolomb(uint32_t symbol, const uint32_t absGoRice); void codeProfileTier(const ProfileTierLevel& ptl, int maxTempSubLayers); void codeScalingList(const ScalingList&); void codeScalingList(const ScalingList& scalingList, uint32_t sizeId, uint32_t listId); void codePredWeightTable(const Slice& slice); void codeInterDir(const CUData& cu, uint32_t absPartIdx); void codePUWise(const CUData& cu, uint32_t absPartIdx); void codeRefFrmIdxPU(const CUData& cu, uint32_t absPartIdx, int list); void codeRefFrmIdx(const CUData& cu, uint32_t absPartIdx, int list); void codeSaoMaxUvlc(uint32_t code, uint32_t maxSymbol); void codeLastSignificantXY(uint32_t posx, uint32_t posy, uint32_t log2TrSize, bool bIsLuma, uint32_t scanIdx); void encodeTransform(const CUData& cu, uint32_t absPartIdx, uint32_t tuDepth, uint32_t log2TrSize, bool& bCodeDQP, const uint32_t depthRange[2]); void copyFrom(const Entropy& src); void copyContextsFrom(const Entropy& src); }; } #endif // ifndef X265_ENTROPY_H