Mercurial > hg > forks > libbpg
comparison x265/source/encoder/entropy.h @ 0:772086c29cc7
Initial import.
author | Matti Hamalainen <ccr@tnsp.org> |
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date | Wed, 16 Nov 2016 11:16:33 +0200 |
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-1:000000000000 | 0:772086c29cc7 |
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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 | |
56 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 | |
65 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 | |
81 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 | |
116 void setBitstream(Bitstream* p) { m_bitIf = p; } | |
117 | |
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; | |
126 void markInvalid() { m_valid = false; } | |
127 void markValid() { m_valid = true; } | |
128 #else | |
129 void markValid() { } | |
130 #endif | |
131 void zeroFract() { m_fracBits = 0; } | |
132 void resetBits(); | |
133 void resetEntropy(const Slice& slice); | |
134 | |
135 // SBAC RD | |
136 void load(const Entropy& src) { copyFrom(src); } | |
137 void store(Entropy& dest) const { dest.copyFrom(*this); } | |
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); | |
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); | |
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 | |
170 inline void codeSaoMerge(uint32_t code) { encodeBin(code, m_contextState[OFF_SAO_MERGE_FLAG_CTX]); } | |
171 inline void codeMVPIdx(uint32_t symbol) { encodeBin(symbol, m_contextState[OFF_MVP_IDX_CTX]); } | |
172 inline void codeMergeFlag(const CUData& cu, uint32_t absPartIdx) { encodeBin(cu.m_mergeFlag[absPartIdx], m_contextState[OFF_MERGE_FLAG_EXT_CTX]); } | |
173 inline void codeSkipFlag(const CUData& cu, uint32_t absPartIdx) { encodeBin(cu.isSkipped(absPartIdx), m_contextState[OFF_SKIP_FLAG_CTX + cu.getCtxSkipFlag(absPartIdx)]); } | |
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)]); } | |
175 inline void codeTransformSubdivFlag(uint32_t symbol, uint32_t ctx) { encodeBin(symbol, m_contextState[OFF_TRANS_SUBDIV_FLAG_CTX + ctx]); } | |
176 inline void codePredMode(int predMode) { encodeBin(predMode == MODE_INTRA ? 1 : 0, m_contextState[OFF_PRED_MODE_CTX]); } | |
177 inline void codeCUTransquantBypassFlag(uint32_t symbol) { encodeBin(symbol, m_contextState[OFF_TQUANT_BYPASS_FLAG_CTX]); } | |
178 inline void codeQtCbfLuma(uint32_t cbf, uint32_t tuDepth) { encodeBin(cbf, m_contextState[OFF_QT_CBF_CTX + !tuDepth]); } | |
179 inline void codeQtCbfChroma(uint32_t cbf, uint32_t tuDepth) { encodeBin(cbf, m_contextState[OFF_QT_CBF_CTX + 2 + tuDepth]); } | |
180 inline void codeQtRootCbf(uint32_t cbf) { encodeBin(cbf, m_contextState[OFF_QT_ROOT_CBF_CTX]); } | |
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 | |
192 inline uint32_t bitsIntraModeNonMPM() const { return bitsCodeBin(0, m_contextState[OFF_ADI_CTX]) + 5; } | |
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); } | |
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; | |
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. */ | |
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 */ | |
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 |