1 /***************************************************************************** 2 * Copyright (C) 2013-2020 MulticoreWare, Inc 3 * 4 * Authors: Steve Borho <steve@borho.org> 5 * Min Chen <chenm003@163.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA. 20 * 21 * This program is also available under a commercial proprietary license. 22 * For more information, contact us at license @ x265.com. 23 *****************************************************************************/ 24 25 #ifndef X265_ENTROPY_H 26 #define X265_ENTROPY_H 27 28 #include "common.h" 29 #include "bitstream.h" 30 #include "frame.h" 31 #include "cudata.h" 32 #include "contexts.h" 33 #include "slice.h" 34 35 namespace X265_NS { 36 // private namespace 37 38 struct SaoCtuParam; 39 struct EstBitsSbac; 40 class ScalingList; 41 42 enum SplitType 43 { 44 DONT_SPLIT = 0, 45 VERTICAL_SPLIT = 1, 46 QUAD_SPLIT = 2, 47 NUMBER_OF_SPLIT_MODES = 3 48 }; 49 50 struct TURecurse 51 { 52 uint32_t section; 53 uint32_t splitMode; 54 uint32_t absPartIdxTURelCU; 55 uint32_t absPartIdxStep; 56 TURecurseTURecurse57 TURecurse(SplitType splitType, uint32_t _absPartIdxStep, uint32_t _absPartIdxTU) 58 { 59 static const uint32_t partIdxStepShift[NUMBER_OF_SPLIT_MODES] = { 0, 1, 2 }; 60 section = 0; 61 absPartIdxTURelCU = _absPartIdxTU; 62 splitMode = (uint32_t)splitType; 63 absPartIdxStep = _absPartIdxStep >> partIdxStepShift[splitMode]; 64 } 65 isNextSectionTURecurse66 bool isNextSection() 67 { 68 if (splitMode == DONT_SPLIT) 69 { 70 section++; 71 return false; 72 } 73 else 74 { 75 absPartIdxTURelCU += absPartIdxStep; 76 77 section++; 78 return section < (uint32_t)(1 << splitMode); 79 } 80 } 81 isLastSectionTURecurse82 bool isLastSection() const 83 { 84 return (section + 1) >= (uint32_t)(1 << splitMode); 85 } 86 }; 87 88 struct EstBitsSbac 89 { 90 int significantCoeffGroupBits[NUM_SIG_CG_FLAG_CTX][2]; 91 int significantBits[2][NUM_SIG_FLAG_CTX]; 92 int lastBits[2][10]; 93 int greaterOneBits[NUM_ONE_FLAG_CTX][2]; 94 int levelAbsBits[NUM_ABS_FLAG_CTX][2]; 95 int blockCbpBits[NUM_QT_CBF_CTX][2]; 96 int blockRootCbpBits[2]; 97 }; 98 99 class Entropy : public SyntaxElementWriter 100 { 101 public: 102 103 uint64_t m_pad; 104 uint8_t m_contextState[160]; // MAX_OFF_CTX_MOD + padding 105 106 /* CABAC state */ 107 uint32_t m_low; 108 uint32_t m_range; 109 uint32_t m_bufferedByte; 110 int m_numBufferedBytes; 111 int m_bitsLeft; 112 uint64_t m_fracBits; 113 EstBitsSbac m_estBitsSbac; 114 double m_meanQP; 115 116 Entropy(); 117 setBitstream(Bitstream * p)118 void setBitstream(Bitstream* p) { m_bitIf = p; } 119 getNumberOfWrittenBits()120 uint32_t getNumberOfWrittenBits() 121 { 122 X265_CHECK(!m_bitIf, "bit counting mode expected\n"); 123 return (uint32_t)(m_fracBits >> 15); 124 } 125 126 #if CHECKED_BUILD || _DEBUG 127 bool m_valid; markInvalid()128 void markInvalid() { m_valid = false; } markValid()129 void markValid() { m_valid = true; } 130 #else markValid()131 void markValid() { } 132 #endif zeroFract()133 void zeroFract() { m_fracBits = 0; } 134 void resetBits(); 135 void resetEntropy(const Slice& slice); 136 137 // SBAC RD load(const Entropy & src)138 void load(const Entropy& src) { copyFrom(src); } store(Entropy & dest)139 void store(Entropy& dest) const { dest.copyFrom(*this); } loadContexts(const Entropy & src)140 void loadContexts(const Entropy& src) { copyContextsFrom(src); } 141 void loadIntraDirModeLuma(const Entropy& src); 142 void copyState(const Entropy& other); 143 144 void codeVPS(const VPS& vps); 145 void codeSPS(const SPS& sps, const ScalingList& scalingList, const ProfileTierLevel& ptl); 146 void codePPS( const PPS& pps, bool filerAcross, int iPPSInitQpMinus26 ); 147 void codeVUI(const VUI& vui, int maxSubTLayers, bool bEmitVUITimingInfo, bool bEmitVUIHRDInfo); 148 void codeAUD(const Slice& slice); 149 void codeHrdParameters(const HRDInfo& hrd, int maxSubTLayers); 150 151 void codeSliceHeader(const Slice& slice, FrameData& encData, uint32_t slice_addr, uint32_t slice_addr_bits, int sliceQp); 152 void codeSliceHeaderWPPEntryPoints(const uint32_t *substreamSizes, uint32_t numSubStreams, uint32_t maxOffset); 153 void codeShortTermRefPicSet(const RPS& rps, int idx); finishSlice()154 void finishSlice() { encodeBinTrm(1); finish(); dynamic_cast<Bitstream*>(m_bitIf)->writeByteAlignment(); } 155 156 void encodeCTU(const CUData& cu, const CUGeom& cuGeom); 157 158 void codeIntraDirLumaAng(const CUData& cu, uint32_t absPartIdx, bool isMultiple); 159 void codeIntraDirChroma(const CUData& cu, uint32_t absPartIdx, uint32_t *chromaDirMode); 160 161 void codeMergeIndex(const CUData& cu, uint32_t absPartIdx); 162 void codeMvd(const CUData& cu, uint32_t absPartIdx, int list); 163 164 void codePartSize(const CUData& cu, uint32_t absPartIdx, uint32_t depth); 165 void codePredInfo(const CUData& cu, uint32_t absPartIdx); 166 167 void codeQtCbfChroma(const CUData& cu, uint32_t absPartIdx, TextType ttype, uint32_t tuDepth, bool lowestLevel); 168 void codeCoeff(const CUData& cu, uint32_t absPartIdx, bool& bCodeDQP, const uint32_t depthRange[2]); 169 void codeCoeffNxN(const CUData& cu, const coeff_t* coef, uint32_t absPartIdx, uint32_t log2TrSize, TextType ttype); 170 codeSaoMerge(uint32_t code)171 inline void codeSaoMerge(uint32_t code) { encodeBin(code, m_contextState[OFF_SAO_MERGE_FLAG_CTX]); } codeSaoType(uint32_t code)172 inline void codeSaoType(uint32_t code) { encodeBin(code, m_contextState[OFF_SAO_TYPE_IDX_CTX]); } codeMVPIdx(uint32_t symbol)173 inline void codeMVPIdx(uint32_t symbol) { encodeBin(symbol, m_contextState[OFF_MVP_IDX_CTX]); } codeMergeFlag(const CUData & cu,uint32_t absPartIdx)174 inline void codeMergeFlag(const CUData& cu, uint32_t absPartIdx) { encodeBin(cu.m_mergeFlag[absPartIdx], m_contextState[OFF_MERGE_FLAG_EXT_CTX]); } codeSkipFlag(const CUData & cu,uint32_t absPartIdx)175 inline void codeSkipFlag(const CUData& cu, uint32_t absPartIdx) { encodeBin(cu.isSkipped(absPartIdx), m_contextState[OFF_SKIP_FLAG_CTX + cu.getCtxSkipFlag(absPartIdx)]); } codeSplitFlag(const CUData & cu,uint32_t absPartIdx,uint32_t depth)176 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)]); } codeTransformSubdivFlag(uint32_t symbol,uint32_t ctx)177 inline void codeTransformSubdivFlag(uint32_t symbol, uint32_t ctx) { encodeBin(symbol, m_contextState[OFF_TRANS_SUBDIV_FLAG_CTX + ctx]); } codePredMode(int predMode)178 inline void codePredMode(int predMode) { encodeBin(predMode == MODE_INTRA ? 1 : 0, m_contextState[OFF_PRED_MODE_CTX]); } codeCUTransquantBypassFlag(uint32_t symbol)179 inline void codeCUTransquantBypassFlag(uint32_t symbol) { encodeBin(symbol, m_contextState[OFF_TQUANT_BYPASS_FLAG_CTX]); } codeQtCbfLuma(uint32_t cbf,uint32_t tuDepth)180 inline void codeQtCbfLuma(uint32_t cbf, uint32_t tuDepth) { encodeBin(cbf, m_contextState[OFF_QT_CBF_CTX + !tuDepth]); } codeQtCbfChroma(uint32_t cbf,uint32_t tuDepth)181 inline void codeQtCbfChroma(uint32_t cbf, uint32_t tuDepth) { encodeBin(cbf, m_contextState[OFF_QT_CBF_CTX + 2 + tuDepth]); } codeQtRootCbf(uint32_t cbf)182 inline void codeQtRootCbf(uint32_t cbf) { encodeBin(cbf, m_contextState[OFF_QT_ROOT_CBF_CTX]); } codeTransformSkipFlags(uint32_t transformSkip,TextType ttype)183 inline void codeTransformSkipFlags(uint32_t transformSkip, TextType ttype) { encodeBin(transformSkip, m_contextState[OFF_TRANSFORMSKIP_FLAG_CTX + (ttype ? NUM_TRANSFORMSKIP_FLAG_CTX : 0)]); } 184 void codeDeltaQP(const CUData& cu, uint32_t absPartIdx); 185 void codeSaoOffset(const SaoCtuParam& ctuParam, int plane); 186 void codeSaoOffsetEO(int *offset, int typeIdx, int plane); 187 void codeSaoOffsetBO(int *offset, int bandPos, int plane); 188 189 /* RDO functions */ 190 void estBit(EstBitsSbac& estBitsSbac, uint32_t log2TrSize, bool bIsLuma) const; 191 void estCBFBit(EstBitsSbac& estBitsSbac) const; 192 void estSignificantCoeffGroupMapBit(EstBitsSbac& estBitsSbac, bool bIsLuma) const; 193 void estSignificantMapBit(EstBitsSbac& estBitsSbac, uint32_t log2TrSize, bool bIsLuma) const; 194 void estSignificantCoefficientsBit(EstBitsSbac& estBitsSbac, bool bIsLuma) const; 195 bitsIntraModeNonMPM()196 inline uint32_t bitsIntraModeNonMPM() const { return bitsCodeBin(0, m_contextState[OFF_ADI_CTX]) + 5; } bitsIntraModeMPM(const uint32_t preds[3],uint32_t dir)197 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); } estimateCbfBits(uint32_t cbf,TextType ttype,uint32_t tuDepth)198 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]]); } 199 uint32_t bitsInterMode(const CUData& cu, uint32_t absPartIdx, uint32_t depth) const; bitsIntraMode(const CUData & cu,uint32_t absPartIdx)200 uint32_t bitsIntraMode(const CUData& cu, uint32_t absPartIdx) const 201 { 202 return bitsCodeBin(0, m_contextState[OFF_SKIP_FLAG_CTX + cu.getCtxSkipFlag(absPartIdx)]) + /* not skip */ 203 bitsCodeBin(1, m_contextState[OFF_PRED_MODE_CTX]); /* intra */ 204 } 205 206 /* these functions are only used to estimate the bits when cbf is 0 and will never be called when writing the bistream. */ codeQtRootCbfZero()207 inline void codeQtRootCbfZero() { encodeBin(0, m_contextState[OFF_QT_ROOT_CBF_CTX]); } 208 209 private: 210 211 /* CABAC private methods */ 212 void start(); 213 void finish(); 214 215 void encodeBin(uint32_t binValue, uint8_t& ctxModel); 216 void encodeBinEP(uint32_t binValue); 217 void encodeBinsEP(uint32_t binValues, int numBins); 218 void encodeBinTrm(uint32_t binValue); 219 220 /* return the bits of encoding the context bin without updating */ bitsCodeBin(uint32_t binValue,uint32_t ctxModel)221 inline uint32_t bitsCodeBin(uint32_t binValue, uint32_t ctxModel) const 222 { 223 uint64_t fracBits = (m_fracBits & 32767) + sbacGetEntropyBits(ctxModel, binValue); 224 return (uint32_t)(fracBits >> 15); 225 } 226 227 void encodeCU(const CUData& ctu, const CUGeom &cuGeom, uint32_t absPartIdx, uint32_t depth, bool& bEncodeDQP); 228 void finishCU(const CUData& ctu, uint32_t absPartIdx, uint32_t depth, bool bEncodeDQP); 229 230 void writeOut(); 231 232 /* SBac private methods */ 233 void writeUnaryMaxSymbol(uint32_t symbol, uint8_t* scmModel, int offset, uint32_t maxSymbol); 234 void writeEpExGolomb(uint32_t symbol, uint32_t count); 235 void writeCoefRemainExGolomb(uint32_t symbol, const uint32_t absGoRice); 236 237 void codeProfileTier(const ProfileTierLevel& ptl, int maxTempSubLayers); 238 void codeScalingList(const ScalingList&); 239 void codeScalingList(const ScalingList& scalingList, uint32_t sizeId, uint32_t listId); 240 241 void codePredWeightTable(const Slice& slice); 242 void codeInterDir(const CUData& cu, uint32_t absPartIdx); 243 void codePUWise(const CUData& cu, uint32_t absPartIdx); 244 void codeRefFrmIdxPU(const CUData& cu, uint32_t absPartIdx, int list); 245 void codeRefFrmIdx(const CUData& cu, uint32_t absPartIdx, int list); 246 247 void codeSaoMaxUvlc(uint32_t code, uint32_t maxSymbol); 248 249 void codeLastSignificantXY(uint32_t posx, uint32_t posy, uint32_t log2TrSize, bool bIsLuma, uint32_t scanIdx); 250 251 void encodeTransform(const CUData& cu, uint32_t absPartIdx, uint32_t tuDepth, uint32_t log2TrSize, 252 bool& bCodeDQP, const uint32_t depthRange[2]); 253 void encodeTransformLuma(const CUData& cu, uint32_t absPartIdx, uint32_t tuDepth, uint32_t log2TrSize, 254 bool& bCodeDQP, const uint32_t depthRange[2]); 255 256 void copyFrom(const Entropy& src); 257 void copyContextsFrom(const Entropy& src); 258 }; 259 } 260 261 #endif // ifndef X265_ENTROPY_H 262