1 /***************************************************************************** 2 * Copyright (C) 2013 x265 project 3 * 4 * Authors: Steve Borho <steve@borho.org> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA. 19 * 20 * This program is also available under a commercial proprietary license. 21 * For more information, contact us at license @ x265.com. 22 *****************************************************************************/ 23 24 #ifndef X265_ENTROPY_H 25 #define X265_ENTROPY_H 26 27 #include "common.h" 28 #include "bitstream.h" 29 #include "frame.h" 30 #include "cudata.h" 31 #include "contexts.h" 32 #include "slice.h" 33 34 namespace X265_NS { 35 // private namespace 36 37 struct SaoCtuParam; 38 struct EstBitsSbac; 39 class ScalingList; 40 41 enum SplitType 42 { 43 DONT_SPLIT = 0, 44 VERTICAL_SPLIT = 1, 45 QUAD_SPLIT = 2, 46 NUMBER_OF_SPLIT_MODES = 3 47 }; 48 49 struct TURecurse 50 { 51 uint32_t section; 52 uint32_t splitMode; 53 uint32_t absPartIdxTURelCU; 54 uint32_t absPartIdxStep; 55 TURecurseTURecurse56 TURecurse(SplitType splitType, uint32_t _absPartIdxStep, uint32_t _absPartIdxTU) 57 { 58 static const uint32_t partIdxStepShift[NUMBER_OF_SPLIT_MODES] = { 0, 1, 2 }; 59 section = 0; 60 absPartIdxTURelCU = _absPartIdxTU; 61 splitMode = (uint32_t)splitType; 62 absPartIdxStep = _absPartIdxStep >> partIdxStepShift[splitMode]; 63 } 64 isNextSectionTURecurse65 bool isNextSection() 66 { 67 if (splitMode == DONT_SPLIT) 68 { 69 section++; 70 return false; 71 } 72 else 73 { 74 absPartIdxTURelCU += absPartIdxStep; 75 76 section++; 77 return section < (uint32_t)(1 << splitMode); 78 } 79 } 80 isLastSectionTURecurse81 bool isLastSection() const 82 { 83 return (section + 1) >= (uint32_t)(1 << splitMode); 84 } 85 }; 86 87 struct EstBitsSbac 88 { 89 int significantCoeffGroupBits[NUM_SIG_CG_FLAG_CTX][2]; 90 int significantBits[2][NUM_SIG_FLAG_CTX]; 91 int lastBits[2][10]; 92 int greaterOneBits[NUM_ONE_FLAG_CTX][2]; 93 int levelAbsBits[NUM_ABS_FLAG_CTX][2]; 94 int blockCbpBits[NUM_QT_CBF_CTX][2]; 95 int blockRootCbpBits[2]; 96 }; 97 98 class Entropy : public SyntaxElementWriter 99 { 100 public: 101 102 uint64_t m_pad; 103 uint8_t m_contextState[160]; // MAX_OFF_CTX_MOD + padding 104 105 /* CABAC state */ 106 uint32_t m_low; 107 uint32_t m_range; 108 uint32_t m_bufferedByte; 109 int m_numBufferedBytes; 110 int m_bitsLeft; 111 uint64_t m_fracBits; 112 EstBitsSbac m_estBitsSbac; 113 114 Entropy(); 115 setBitstream(Bitstream * p)116 void setBitstream(Bitstream* p) { m_bitIf = p; } 117 getNumberOfWrittenBits()118 uint32_t getNumberOfWrittenBits() 119 { 120 X265_CHECK(!m_bitIf, "bit counting mode expected\n"); 121 return (uint32_t)(m_fracBits >> 15); 122 } 123 124 #if CHECKED_BUILD || _DEBUG 125 bool m_valid; markInvalid()126 void markInvalid() { m_valid = false; } markValid()127 void markValid() { m_valid = true; } 128 #else markValid()129 void markValid() { } 130 #endif zeroFract()131 void zeroFract() { m_fracBits = 0; } 132 void resetBits(); 133 void resetEntropy(const Slice& slice); 134 135 // SBAC RD load(const Entropy & src)136 void load(const Entropy& src) { copyFrom(src); } store(Entropy & dest)137 void store(Entropy& dest) const { dest.copyFrom(*this); } loadContexts(const Entropy & src)138 void loadContexts(const Entropy& src) { copyContextsFrom(src); } 139 void loadIntraDirModeLuma(const Entropy& src); 140 void copyState(const Entropy& other); 141 142 void codeVPS(const VPS& vps); 143 void codeSPS(const SPS& sps, const ScalingList& scalingList, const ProfileTierLevel& ptl); 144 void codePPS(const PPS& pps); 145 void codeVUI(const VUI& vui, int maxSubTLayers); 146 void codeAUD(const Slice& slice); 147 void codeHrdParameters(const HRDInfo& hrd, int maxSubTLayers); 148 149 void codeSliceHeader(const Slice& slice, FrameData& encData); 150 void codeSliceHeaderWPPEntryPoints(const Slice& slice, const uint32_t *substreamSizes, uint32_t maxOffset); 151 void codeShortTermRefPicSet(const RPS& rps); finishSlice()152 void finishSlice() { encodeBinTrm(1); finish(); dynamic_cast<Bitstream*>(m_bitIf)->writeByteAlignment(); } 153 154 void encodeCTU(const CUData& cu, const CUGeom& cuGeom); 155 156 void codeIntraDirLumaAng(const CUData& cu, uint32_t absPartIdx, bool isMultiple); 157 void codeIntraDirChroma(const CUData& cu, uint32_t absPartIdx, uint32_t *chromaDirMode); 158 159 void codeMergeIndex(const CUData& cu, uint32_t absPartIdx); 160 void codeMvd(const CUData& cu, uint32_t absPartIdx, int list); 161 162 void codePartSize(const CUData& cu, uint32_t absPartIdx, uint32_t depth); 163 void codePredInfo(const CUData& cu, uint32_t absPartIdx); codeQtCbfLuma(const CUData & cu,uint32_t absPartIdx,uint32_t tuDepth)164 inline void codeQtCbfLuma(const CUData& cu, uint32_t absPartIdx, uint32_t tuDepth) { codeQtCbfLuma(cu.getCbf(absPartIdx, TEXT_LUMA, tuDepth), tuDepth); } 165 166 void codeQtCbfChroma(const CUData& cu, uint32_t absPartIdx, TextType ttype, uint32_t tuDepth, bool lowestLevel); 167 void codeCoeff(const CUData& cu, uint32_t absPartIdx, bool& bCodeDQP, const uint32_t depthRange[2]); 168 void codeCoeffNxN(const CUData& cu, const coeff_t* coef, uint32_t absPartIdx, uint32_t log2TrSize, TextType ttype); 169 codeSaoMerge(uint32_t code)170 inline void codeSaoMerge(uint32_t code) { encodeBin(code, m_contextState[OFF_SAO_MERGE_FLAG_CTX]); } codeMVPIdx(uint32_t symbol)171 inline void codeMVPIdx(uint32_t symbol) { encodeBin(symbol, m_contextState[OFF_MVP_IDX_CTX]); } codeMergeFlag(const CUData & cu,uint32_t absPartIdx)172 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)173 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)174 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)175 inline void codeTransformSubdivFlag(uint32_t symbol, uint32_t ctx) { encodeBin(symbol, m_contextState[OFF_TRANS_SUBDIV_FLAG_CTX + ctx]); } codePredMode(int predMode)176 inline void codePredMode(int predMode) { encodeBin(predMode == MODE_INTRA ? 1 : 0, m_contextState[OFF_PRED_MODE_CTX]); } codeCUTransquantBypassFlag(uint32_t symbol)177 inline void codeCUTransquantBypassFlag(uint32_t symbol) { encodeBin(symbol, m_contextState[OFF_TQUANT_BYPASS_FLAG_CTX]); } codeQtCbfLuma(uint32_t cbf,uint32_t tuDepth)178 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)179 inline void codeQtCbfChroma(uint32_t cbf, uint32_t tuDepth) { encodeBin(cbf, m_contextState[OFF_QT_CBF_CTX + 2 + tuDepth]); } codeQtRootCbf(uint32_t cbf)180 inline void codeQtRootCbf(uint32_t cbf) { encodeBin(cbf, m_contextState[OFF_QT_ROOT_CBF_CTX]); } codeTransformSkipFlags(uint32_t transformSkip,TextType ttype)181 inline void codeTransformSkipFlags(uint32_t transformSkip, TextType ttype) { encodeBin(transformSkip, m_contextState[OFF_TRANSFORMSKIP_FLAG_CTX + (ttype ? NUM_TRANSFORMSKIP_FLAG_CTX : 0)]); } 182 void codeDeltaQP(const CUData& cu, uint32_t absPartIdx); 183 void codeSaoOffset(const SaoCtuParam& ctuParam, int plane); 184 185 /* RDO functions */ 186 void estBit(EstBitsSbac& estBitsSbac, uint32_t log2TrSize, bool bIsLuma) const; 187 void estCBFBit(EstBitsSbac& estBitsSbac) const; 188 void estSignificantCoeffGroupMapBit(EstBitsSbac& estBitsSbac, bool bIsLuma) const; 189 void estSignificantMapBit(EstBitsSbac& estBitsSbac, uint32_t log2TrSize, bool bIsLuma) const; 190 void estSignificantCoefficientsBit(EstBitsSbac& estBitsSbac, bool bIsLuma) const; 191 bitsIntraModeNonMPM()192 inline uint32_t bitsIntraModeNonMPM() const { return bitsCodeBin(0, m_contextState[OFF_ADI_CTX]) + 5; } bitsIntraModeMPM(const uint32_t preds[3],uint32_t dir)193 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)194 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]]); } 195 uint32_t bitsInterMode(const CUData& cu, uint32_t absPartIdx, uint32_t depth) const; bitsIntraMode(const CUData & cu,uint32_t absPartIdx)196 uint32_t bitsIntraMode(const CUData& cu, uint32_t absPartIdx) const 197 { 198 return bitsCodeBin(0, m_contextState[OFF_SKIP_FLAG_CTX + cu.getCtxSkipFlag(absPartIdx)]) + /* not skip */ 199 bitsCodeBin(1, m_contextState[OFF_PRED_MODE_CTX]); /* intra */ 200 } 201 202 /* these functions are only used to estimate the bits when cbf is 0 and will never be called when writing the bistream. */ codeQtRootCbfZero()203 inline void codeQtRootCbfZero() { encodeBin(0, m_contextState[OFF_QT_ROOT_CBF_CTX]); } 204 205 private: 206 207 /* CABAC private methods */ 208 void start(); 209 void finish(); 210 211 void encodeBin(uint32_t binValue, uint8_t& ctxModel); 212 void encodeBinEP(uint32_t binValue); 213 void encodeBinsEP(uint32_t binValues, int numBins); 214 void encodeBinTrm(uint32_t binValue); 215 216 /* return the bits of encoding the context bin without updating */ bitsCodeBin(uint32_t binValue,uint32_t ctxModel)217 inline uint32_t bitsCodeBin(uint32_t binValue, uint32_t ctxModel) const 218 { 219 uint64_t fracBits = (m_fracBits & 32767) + sbacGetEntropyBits(ctxModel, binValue); 220 return (uint32_t)(fracBits >> 15); 221 } 222 223 void encodeCU(const CUData& ctu, const CUGeom &cuGeom, uint32_t absPartIdx, uint32_t depth, bool& bEncodeDQP); 224 void finishCU(const CUData& ctu, uint32_t absPartIdx, uint32_t depth, bool bEncodeDQP); 225 226 void writeOut(); 227 228 /* SBac private methods */ 229 void writeUnaryMaxSymbol(uint32_t symbol, uint8_t* scmModel, int offset, uint32_t maxSymbol); 230 void writeEpExGolomb(uint32_t symbol, uint32_t count); 231 void writeCoefRemainExGolomb(uint32_t symbol, const uint32_t absGoRice); 232 233 void codeProfileTier(const ProfileTierLevel& ptl, int maxTempSubLayers); 234 void codeScalingList(const ScalingList&); 235 void codeScalingList(const ScalingList& scalingList, uint32_t sizeId, uint32_t listId); 236 237 void codePredWeightTable(const Slice& slice); 238 void codeInterDir(const CUData& cu, uint32_t absPartIdx); 239 void codePUWise(const CUData& cu, uint32_t absPartIdx); 240 void codeRefFrmIdxPU(const CUData& cu, uint32_t absPartIdx, int list); 241 void codeRefFrmIdx(const CUData& cu, uint32_t absPartIdx, int list); 242 243 void codeSaoMaxUvlc(uint32_t code, uint32_t maxSymbol); 244 245 void codeLastSignificantXY(uint32_t posx, uint32_t posy, uint32_t log2TrSize, bool bIsLuma, uint32_t scanIdx); 246 247 void encodeTransform(const CUData& cu, uint32_t absPartIdx, uint32_t tuDepth, uint32_t log2TrSize, 248 bool& bCodeDQP, const uint32_t depthRange[2]); 249 250 void copyFrom(const Entropy& src); 251 void copyContextsFrom(const Entropy& src); 252 }; 253 } 254 255 #endif // ifndef X265_ENTROPY_H 256