| 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 "contexts.h" |
| 31 | #include "slice.h" |
| 32 | |
| 33 | namespace x265 { |
| 34 | // private namespace |
| 35 | |
| 36 | struct SaoCtuParam; |
| 37 | struct EstBitsSbac; |
| 38 | class CUData; |
| 39 | struct CUGeom; |
| 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 | |
| 57 | 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 | |
| 66 | 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 | |
| 82 | 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[NUM_SIG_FLAG_CTX][2]; |
| 92 | int lastXBits[10]; |
| 93 | int lastYBits[10]; |
| 94 | int greaterOneBits[NUM_ONE_FLAG_CTX][2]; |
| 95 | int levelAbsBits[NUM_ABS_FLAG_CTX][2]; |
| 96 | int blockCbpBits[NUM_QT_CBF_CTX][2]; |
| 97 | int blockRootCbpBits[2]; |
| 98 | }; |
| 99 | |
| 100 | class Entropy : public SyntaxElementWriter |
| 101 | { |
| 102 | public: |
| 103 | |
| 104 | uint64_t m_pad; |
| 105 | uint8_t m_contextState[160]; // MAX_OFF_CTX_MOD + padding |
| 106 | |
| 107 | /* CABAC state */ |
| 108 | uint32_t m_low; |
| 109 | uint32_t m_range; |
| 110 | uint32_t m_bufferedByte; |
| 111 | int m_numBufferedBytes; |
| 112 | int m_bitsLeft; |
| 113 | uint64_t m_fracBits; |
| 114 | EstBitsSbac m_estBitsSbac; |
| 115 | |
| 116 | Entropy(); |
| 117 | |
| 118 | void setBitstream(Bitstream* p) { m_bitIf = p; } |
| 119 | |
| 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; |
| 128 | void markInvalid() { m_valid = false; } |
| 129 | void markValid() { m_valid = true; } |
| 130 | #else |
| 131 | void markValid() { } |
| 132 | #endif |
| 133 | void zeroFract() { m_fracBits = 0; } |
| 134 | void resetBits(); |
| 135 | void resetEntropy(const Slice& slice); |
| 136 | |
| 137 | // SBAC RD |
| 138 | void load(const Entropy& src) { copyFrom(src); } |
| 139 | void store(Entropy& dest) const { dest.copyFrom(*this); } |
| 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); |
| 147 | void codeVUI(const VUI& vui); |
| 148 | void codeAUD(const Slice& slice); |
| 149 | void codeHrdParameters(const HRDInfo& hrd); |
| 150 | |
| 151 | void codeSliceHeader(const Slice& slice, FrameData& encData); |
| 152 | void codeSliceHeaderWPPEntryPoints(const Slice& slice, const uint32_t *substreamSizes, uint32_t maxOffset); |
| 153 | void codeShortTermRefPicSet(const RPS& rps); |
| 154 | void finishSlice() { encodeBinTrm(1); finish(); dynamic_cast<Bitstream*>(m_bitIf)->writeByteAlignment(); } |
| 155 | |
| 156 | void encodeCTU(const CUData& cu, const CUGeom& cuGeom); |
| 157 | void codeSaoOffset(const SaoCtuParam& ctuParam, int plane); |
| 158 | void codeSaoMerge(uint32_t code) { encodeBin(code, m_contextState[OFF_SAO_MERGE_FLAG_CTX]); } |
| 159 | |
| 160 | void codeCUTransquantBypassFlag(uint32_t symbol); |
| 161 | void codeSkipFlag(const CUData& cu, uint32_t absPartIdx); |
| 162 | void codeMergeFlag(const CUData& cu, uint32_t absPartIdx); |
| 163 | void codeMergeIndex(const CUData& cu, uint32_t absPartIdx); |
| 164 | void codeSplitFlag(const CUData& cu, uint32_t absPartIdx, uint32_t depth); |
| 165 | void codeMVPIdx(uint32_t symbol); |
| 166 | void codeMvd(const CUData& cu, uint32_t absPartIdx, int list); |
| 167 | |
| 168 | void codePartSize(const CUData& cu, uint32_t absPartIdx, uint32_t depth); |
| 169 | void codePredMode(int predMode); |
| 170 | void codePredInfo(const CUData& cu, uint32_t absPartIdx); |
| 171 | void codeTransformSubdivFlag(uint32_t symbol, uint32_t ctx); |
| 172 | void codeQtCbf(const CUData& cu, uint32_t absPartIdx, uint32_t absPartIdxStep, uint32_t width, uint32_t height, TextType ttype, uint32_t trDepth, bool lowestLevel); |
| 173 | void codeQtCbf(const CUData& cu, uint32_t absPartIdx, TextType ttype, uint32_t trDepth); |
| 174 | void codeQtCbf(uint32_t cbf, TextType ttype, uint32_t trDepth); |
| 175 | void codeQtCbfZero(TextType ttype, uint32_t trDepth); |
| 176 | void codeQtRootCbfZero(); |
| 177 | void codeCoeff(const CUData& cu, uint32_t absPartIdx, uint32_t depth, bool& bCodeDQP, uint32_t depthRange[2]); |
| 178 | void codeCoeffNxN(const CUData& cu, const coeff_t* coef, uint32_t absPartIdx, uint32_t log2TrSize, TextType ttype); |
| 179 | |
| 180 | uint32_t bitsIntraModeNonMPM() const; |
| 181 | uint32_t bitsIntraModeMPM(const uint32_t preds[3], uint32_t dir) const; |
| 182 | void codeIntraDirLumaAng(const CUData& cu, uint32_t absPartIdx, bool isMultiple); |
| 183 | void codeIntraDirChroma(const CUData& cu, uint32_t absPartIdx, uint32_t *chromaDirMode); |
| 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 | |
| 192 | private: |
| 193 | |
| 194 | /* CABAC private methods */ |
| 195 | void start(); |
| 196 | void finish(); |
| 197 | |
| 198 | void encodeBin(uint32_t binValue, uint8_t& ctxModel); |
| 199 | void encodeBinEP(uint32_t binValue); |
| 200 | void encodeBinsEP(uint32_t binValues, int numBins); |
| 201 | void encodeBinTrm(uint32_t binValue); |
| 202 | |
| 203 | void encodeCU(const CUData& cu, const CUGeom &cuGeom, uint32_t absPartIdx, uint32_t depth, bool& bEncodeDQP); |
| 204 | void finishCU(const CUData& cu, uint32_t absPartIdx, uint32_t depth); |
| 205 | |
| 206 | void writeOut(); |
| 207 | |
| 208 | /* SBac private methods */ |
| 209 | void writeUnaryMaxSymbol(uint32_t symbol, uint8_t* scmModel, int offset, uint32_t maxSymbol); |
| 210 | void writeEpExGolomb(uint32_t symbol, uint32_t count); |
| 211 | void writeCoefRemainExGolomb(uint32_t symbol, const uint32_t absGoRice); |
| 212 | |
| 213 | void codeProfileTier(const ProfileTierLevel& ptl); |
| 214 | void codeScalingList(const ScalingList&); |
| 215 | void codeScalingList(const ScalingList& scalingList, uint32_t sizeId, uint32_t listId); |
| 216 | |
| 217 | void codePredWeightTable(const Slice& slice); |
| 218 | void codeInterDir(const CUData& cu, uint32_t absPartIdx); |
| 219 | void codePUWise(const CUData& cu, uint32_t absPartIdx); |
| 220 | void codeQtRootCbf(uint32_t cbf); |
| 221 | void codeRefFrmIdxPU(const CUData& cu, uint32_t absPartIdx, int list); |
| 222 | void codeRefFrmIdx(const CUData& cu, uint32_t absPartIdx, int list); |
| 223 | |
| 224 | void codeSaoMaxUvlc(uint32_t code, uint32_t maxSymbol); |
| 225 | |
| 226 | void codeDeltaQP(const CUData& cu, uint32_t absPartIdx); |
| 227 | void codeLastSignificantXY(uint32_t posx, uint32_t posy, uint32_t log2TrSize, bool bIsLuma, uint32_t scanIdx); |
| 228 | void codeTransformSkipFlags(const CUData& cu, uint32_t absPartIdx, uint32_t trSize, TextType ttype); |
| 229 | |
| 230 | struct CoeffCodeState |
| 231 | { |
| 232 | uint32_t bakAbsPartIdx; |
| 233 | uint32_t bakChromaOffset; |
| 234 | uint32_t bakAbsPartIdxCU; |
| 235 | }; |
| 236 | |
| 237 | void encodeTransform(const CUData& cu, CoeffCodeState& state, uint32_t offsetLumaOffset, uint32_t offsetChroma, |
| 238 | uint32_t absPartIdx, uint32_t absPartIdxStep, uint32_t depth, uint32_t log2TrSize, uint32_t trIdx, |
| 239 | bool& bCodeDQP, uint32_t depthRange[2]); |
| 240 | |
| 241 | void copyFrom(const Entropy& src); |
| 242 | void copyContextsFrom(const Entropy& src); |
| 243 | }; |
| 244 | } |
| 245 | |
| 246 | #endif // ifndef X265_ENTROPY_H |