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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 "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 |