255 lines
11 KiB
C++
255 lines
11 KiB
C++
/*****************************************************************************
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* Copyright (C) 2013 x265 project
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*
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* Authors: Steve Borho <steve@borho.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
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*
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* This program is also available under a commercial proprietary license.
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* For more information, contact us at license @ x265.com.
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*****************************************************************************/
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#ifndef X265_ENTROPY_H
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#define X265_ENTROPY_H
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#include "common.h"
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#include "bitstream.h"
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#include "frame.h"
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#include "cudata.h"
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#include "contexts.h"
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#include "slice.h"
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namespace X265_NS {
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// private namespace
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struct SaoCtuParam;
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struct EstBitsSbac;
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class ScalingList;
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enum SplitType
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{
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DONT_SPLIT = 0,
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VERTICAL_SPLIT = 1,
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QUAD_SPLIT = 2,
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NUMBER_OF_SPLIT_MODES = 3
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};
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struct TURecurse
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{
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uint32_t section;
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uint32_t splitMode;
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uint32_t absPartIdxTURelCU;
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uint32_t absPartIdxStep;
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TURecurse(SplitType splitType, uint32_t _absPartIdxStep, uint32_t _absPartIdxTU)
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{
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static const uint32_t partIdxStepShift[NUMBER_OF_SPLIT_MODES] = { 0, 1, 2 };
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section = 0;
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absPartIdxTURelCU = _absPartIdxTU;
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splitMode = (uint32_t)splitType;
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absPartIdxStep = _absPartIdxStep >> partIdxStepShift[splitMode];
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}
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bool isNextSection()
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{
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if (splitMode == DONT_SPLIT)
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{
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section++;
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return false;
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}
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else
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{
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absPartIdxTURelCU += absPartIdxStep;
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section++;
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return section < (uint32_t)(1 << splitMode);
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}
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}
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bool isLastSection() const
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{
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return (section + 1) >= (uint32_t)(1 << splitMode);
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}
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};
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struct EstBitsSbac
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{
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int significantCoeffGroupBits[NUM_SIG_CG_FLAG_CTX][2];
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int significantBits[2][NUM_SIG_FLAG_CTX];
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int lastBits[2][10];
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int greaterOneBits[NUM_ONE_FLAG_CTX][2];
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int levelAbsBits[NUM_ABS_FLAG_CTX][2];
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int blockCbpBits[NUM_QT_CBF_CTX][2];
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int blockRootCbpBits[2];
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};
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class Entropy : public SyntaxElementWriter
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{
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public:
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uint64_t m_pad;
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uint8_t m_contextState[160]; // MAX_OFF_CTX_MOD + padding
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/* CABAC state */
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uint32_t m_low;
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uint32_t m_range;
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uint32_t m_bufferedByte;
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int m_numBufferedBytes;
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int m_bitsLeft;
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uint64_t m_fracBits;
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EstBitsSbac m_estBitsSbac;
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Entropy();
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void setBitstream(Bitstream* p) { m_bitIf = p; }
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uint32_t getNumberOfWrittenBits()
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{
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X265_CHECK(!m_bitIf, "bit counting mode expected\n");
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return (uint32_t)(m_fracBits >> 15);
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}
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#if CHECKED_BUILD || _DEBUG
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bool m_valid;
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void markInvalid() { m_valid = false; }
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void markValid() { m_valid = true; }
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#else
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void markValid() { }
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#endif
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void zeroFract() { m_fracBits = 0; }
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void resetBits();
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void resetEntropy(const Slice& slice);
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// SBAC RD
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void load(const Entropy& src) { copyFrom(src); }
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void store(Entropy& dest) const { dest.copyFrom(*this); }
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void loadContexts(const Entropy& src) { copyContextsFrom(src); }
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void loadIntraDirModeLuma(const Entropy& src);
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void copyState(const Entropy& other);
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void codeVPS(const VPS& vps);
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void codeSPS(const SPS& sps, const ScalingList& scalingList, const ProfileTierLevel& ptl);
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void codePPS(const PPS& pps);
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void codeVUI(const VUI& vui, int maxSubTLayers);
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void codeAUD(const Slice& slice);
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void codeHrdParameters(const HRDInfo& hrd, int maxSubTLayers);
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void codeSliceHeader(const Slice& slice, FrameData& encData);
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void codeSliceHeaderWPPEntryPoints(const Slice& slice, const uint32_t *substreamSizes, uint32_t maxOffset);
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void codeShortTermRefPicSet(const RPS& rps);
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void finishSlice() { encodeBinTrm(1); finish(); dynamic_cast<Bitstream*>(m_bitIf)->writeByteAlignment(); }
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void encodeCTU(const CUData& cu, const CUGeom& cuGeom);
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void codeIntraDirLumaAng(const CUData& cu, uint32_t absPartIdx, bool isMultiple);
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void codeIntraDirChroma(const CUData& cu, uint32_t absPartIdx, uint32_t *chromaDirMode);
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void codeMergeIndex(const CUData& cu, uint32_t absPartIdx);
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void codeMvd(const CUData& cu, uint32_t absPartIdx, int list);
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void codePartSize(const CUData& cu, uint32_t absPartIdx, uint32_t depth);
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void codePredInfo(const CUData& cu, uint32_t absPartIdx);
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inline void codeQtCbfLuma(const CUData& cu, uint32_t absPartIdx, uint32_t tuDepth) { codeQtCbfLuma(cu.getCbf(absPartIdx, TEXT_LUMA, tuDepth), tuDepth); }
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void codeQtCbfChroma(const CUData& cu, uint32_t absPartIdx, TextType ttype, uint32_t tuDepth, bool lowestLevel);
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void codeCoeff(const CUData& cu, uint32_t absPartIdx, bool& bCodeDQP, const uint32_t depthRange[2]);
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void codeCoeffNxN(const CUData& cu, const coeff_t* coef, uint32_t absPartIdx, uint32_t log2TrSize, TextType ttype);
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inline void codeSaoMerge(uint32_t code) { encodeBin(code, m_contextState[OFF_SAO_MERGE_FLAG_CTX]); }
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inline void codeMVPIdx(uint32_t symbol) { encodeBin(symbol, m_contextState[OFF_MVP_IDX_CTX]); }
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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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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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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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inline void codeTransformSubdivFlag(uint32_t symbol, uint32_t ctx) { encodeBin(symbol, m_contextState[OFF_TRANS_SUBDIV_FLAG_CTX + ctx]); }
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inline void codePredMode(int predMode) { encodeBin(predMode == MODE_INTRA ? 1 : 0, m_contextState[OFF_PRED_MODE_CTX]); }
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inline void codeCUTransquantBypassFlag(uint32_t symbol) { encodeBin(symbol, m_contextState[OFF_TQUANT_BYPASS_FLAG_CTX]); }
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inline void codeQtCbfLuma(uint32_t cbf, uint32_t tuDepth) { encodeBin(cbf, m_contextState[OFF_QT_CBF_CTX + !tuDepth]); }
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inline void codeQtCbfChroma(uint32_t cbf, uint32_t tuDepth) { encodeBin(cbf, m_contextState[OFF_QT_CBF_CTX + 2 + tuDepth]); }
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inline void codeQtRootCbf(uint32_t cbf) { encodeBin(cbf, m_contextState[OFF_QT_ROOT_CBF_CTX]); }
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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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void codeDeltaQP(const CUData& cu, uint32_t absPartIdx);
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void codeSaoOffset(const SaoCtuParam& ctuParam, int plane);
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/* RDO functions */
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void estBit(EstBitsSbac& estBitsSbac, uint32_t log2TrSize, bool bIsLuma) const;
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void estCBFBit(EstBitsSbac& estBitsSbac) const;
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void estSignificantCoeffGroupMapBit(EstBitsSbac& estBitsSbac, bool bIsLuma) const;
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void estSignificantMapBit(EstBitsSbac& estBitsSbac, uint32_t log2TrSize, bool bIsLuma) const;
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void estSignificantCoefficientsBit(EstBitsSbac& estBitsSbac, bool bIsLuma) const;
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inline uint32_t bitsIntraModeNonMPM() const { return bitsCodeBin(0, m_contextState[OFF_ADI_CTX]) + 5; }
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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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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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uint32_t bitsInterMode(const CUData& cu, uint32_t absPartIdx, uint32_t depth) const;
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uint32_t bitsIntraMode(const CUData& cu, uint32_t absPartIdx) const
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{
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return bitsCodeBin(0, m_contextState[OFF_SKIP_FLAG_CTX + cu.getCtxSkipFlag(absPartIdx)]) + /* not skip */
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bitsCodeBin(1, m_contextState[OFF_PRED_MODE_CTX]); /* intra */
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}
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/* 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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inline void codeQtRootCbfZero() { encodeBin(0, m_contextState[OFF_QT_ROOT_CBF_CTX]); }
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private:
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/* CABAC private methods */
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void start();
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void finish();
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void encodeBin(uint32_t binValue, uint8_t& ctxModel);
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void encodeBinEP(uint32_t binValue);
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void encodeBinsEP(uint32_t binValues, int numBins);
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void encodeBinTrm(uint32_t binValue);
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/* return the bits of encoding the context bin without updating */
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inline uint32_t bitsCodeBin(uint32_t binValue, uint32_t ctxModel) const
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{
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uint64_t fracBits = (m_fracBits & 32767) + sbacGetEntropyBits(ctxModel, binValue);
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return (uint32_t)(fracBits >> 15);
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}
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void encodeCU(const CUData& ctu, const CUGeom &cuGeom, uint32_t absPartIdx, uint32_t depth, bool& bEncodeDQP);
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void finishCU(const CUData& ctu, uint32_t absPartIdx, uint32_t depth, bool bEncodeDQP);
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void writeOut();
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/* SBac private methods */
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void writeUnaryMaxSymbol(uint32_t symbol, uint8_t* scmModel, int offset, uint32_t maxSymbol);
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void writeEpExGolomb(uint32_t symbol, uint32_t count);
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void writeCoefRemainExGolomb(uint32_t symbol, const uint32_t absGoRice);
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void codeProfileTier(const ProfileTierLevel& ptl, int maxTempSubLayers);
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void codeScalingList(const ScalingList&);
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void codeScalingList(const ScalingList& scalingList, uint32_t sizeId, uint32_t listId);
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void codePredWeightTable(const Slice& slice);
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void codeInterDir(const CUData& cu, uint32_t absPartIdx);
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void codePUWise(const CUData& cu, uint32_t absPartIdx);
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void codeRefFrmIdxPU(const CUData& cu, uint32_t absPartIdx, int list);
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void codeRefFrmIdx(const CUData& cu, uint32_t absPartIdx, int list);
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void codeSaoMaxUvlc(uint32_t code, uint32_t maxSymbol);
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void codeLastSignificantXY(uint32_t posx, uint32_t posy, uint32_t log2TrSize, bool bIsLuma, uint32_t scanIdx);
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void encodeTransform(const CUData& cu, uint32_t absPartIdx, uint32_t tuDepth, uint32_t log2TrSize,
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bool& bCodeDQP, const uint32_t depthRange[2]);
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void copyFrom(const Entropy& src);
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void copyContextsFrom(const Entropy& src);
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};
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}
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#endif // ifndef X265_ENTROPY_H
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