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