HEVC代码追踪（十四）:解码之xDecodeSlice
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Bool TDecTop::decode(InputNALUnit& nalu, Int& iSkipFrame, Int& iPOCLastDisplay){ // Initialize entropy decoder m_cEntropyDecoder.setEntropyDecoder (&m_cCavlcDecoder); m_cEntropyDecoder.setBitstream (nalu.m_Bitstream); switch (nalu.m_nalUnitType) { case NAL_UNIT_VPS: xDecodeVPS(); return false; case NAL_UNIT_SPS: xDecodeSPS(); return false; case NAL_UNIT_PPS: xDecodePPS(); return false; case NAL_UNIT_PREFIX_SEI: case NAL_UNIT_SUFFIX_SEI: xDecodeSEI( nalu.m_Bitstream, nalu.m_nalUnitType ); return false; case NAL_UNIT_CODED_SLICE_TRAIL_R: case NAL_UNIT_CODED_SLICE_TRAIL_N: case NAL_UNIT_CODED_SLICE_TSA_R: case NAL_UNIT_CODED_SLICE_TSA_N: case NAL_UNIT_CODED_SLICE_STSA_R: case NAL_UNIT_CODED_SLICE_STSA_N: case NAL_UNIT_CODED_SLICE_BLA_W_LP: case NAL_UNIT_CODED_SLICE_BLA_W_RADL: case NAL_UNIT_CODED_SLICE_BLA_N_LP: case NAL_UNIT_CODED_SLICE_IDR_W_RADL: case NAL_UNIT_CODED_SLICE_IDR_N_LP: case NAL_UNIT_CODED_SLICE_CRA: case NAL_UNIT_CODED_SLICE_RADL_N: case NAL_UNIT_CODED_SLICE_RADL_R: case NAL_UNIT_CODED_SLICE_RASL_N: case NAL_UNIT_CODED_SLICE_RASL_R: return xDecodeSlice(nalu, iSkipFrame, iPOCLastDisplay); break; case NAL_UNIT_EOS: m_associatedIRAPType = NAL_UNIT_INVALID; m_pocCRA = 0; m_pocRandomAccess = MAX_INT; m_prevPOC = MAX_INT; m_bFirstSliceInPicture = true; m_bFirstSliceInSequence = true; m_prevSliceSkipped = false; m_skippedPOC = 0; return false; case NAL_UNIT_ACCESS_UNIT_DELIMITER: // TODO: process AU delimiter return false; case NAL_UNIT_EOB: return false; case NAL_UNIT_FILLER_DATA: return false; case NAL_UNIT_RESERVED_VCL_N10: case NAL_UNIT_RESERVED_VCL_R11: case NAL_UNIT_RESERVED_VCL_N12: case NAL_UNIT_RESERVED_VCL_R13: case NAL_UNIT_RESERVED_VCL_N14: case NAL_UNIT_RESERVED_VCL_R15: case NAL_UNIT_RESERVED_IRAP_VCL22: case NAL_UNIT_RESERVED_IRAP_VCL23: case NAL_UNIT_RESERVED_VCL24: case NAL_UNIT_RESERVED_VCL25: case NAL_UNIT_RESERVED_VCL26: case NAL_UNIT_RESERVED_VCL27: case NAL_UNIT_RESERVED_VCL28: case NAL_UNIT_RESERVED_VCL29: case NAL_UNIT_RESERVED_VCL30: case NAL_UNIT_RESERVED_VCL31: case NAL_UNIT_RESERVED_NVCL41: case NAL_UNIT_RESERVED_NVCL42: case NAL_UNIT_RESERVED_NVCL43: case NAL_UNIT_RESERVED_NVCL44: case NAL_UNIT_RESERVED_NVCL45: case NAL_UNIT_RESERVED_NVCL46: case NAL_UNIT_RESERVED_NVCL47: case NAL_UNIT_UNSPECIFIED_48: case NAL_UNIT_UNSPECIFIED_49: case NAL_UNIT_UNSPECIFIED_50: case NAL_UNIT_UNSPECIFIED_51: case NAL_UNIT_UNSPECIFIED_52: case NAL_UNIT_UNSPECIFIED_53: case NAL_UNIT_UNSPECIFIED_54: case NAL_UNIT_UNSPECIFIED_55: case NAL_UNIT_UNSPECIFIED_56: case NAL_UNIT_UNSPECIFIED_57: case NAL_UNIT_UNSPECIFIED_58: case NAL_UNIT_UNSPECIFIED_59: case NAL_UNIT_UNSPECIFIED_60: case NAL_UNIT_UNSPECIFIED_61: case NAL_UNIT_UNSPECIFIED_62: case NAL_UNIT_UNSPECIFIED_63: default: assert (0); } return false;}Bool TDecTop::xDecodeSlice(InputNALUnit &nalu, Int &iSkipFrame, Int iPOCLastDisplay ){ TComPic*& pcPic = m_pcPic; m_apcSlicePilot->initSlice(); if (m_bFirstSliceInPicture) { m_uiSliceIdx = 0; } else { m_apcSlicePilot->copySliceInfo( pcPic->getPicSym()->getSlice(m_uiSliceIdx-1) ); } m_apcSlicePilot->setSliceIdx(m_uiSliceIdx); m_apcSlicePilot->setNalUnitType(nalu.m_nalUnitType); Bool nonReferenceFlag = (m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_TRAIL_N || m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_TSA_N || m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_STSA_N || m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_RADL_N || m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_RASL_N); m_apcSlicePilot->setTemporalLayerNonReferenceFlag(nonReferenceFlag); m_apcSlicePilot->setReferenced(true); // Putting this as true ensures that picture is referenced the first time it is in an RPS m_apcSlicePilot->setTLayerInfo(nalu.m_temporalId); m_cEntropyDecoder.decodeSliceHeader (m_apcSlicePilot, &m_parameterSetManagerDecoder); // set POC for dependent slices in skipped pictures if(m_apcSlicePilot->getDependentSliceSegmentFlag() && m_prevSliceSkipped) { m_apcSlicePilot->setPOC(m_skippedPOC); } m_apcSlicePilot->setAssociatedIRAPPOC(m_pocCRA); m_apcSlicePilot->setAssociatedIRAPType(m_associatedIRAPType);#if SETTING_NO_OUT_PIC_PRIOR //For inference of NoOutputOfPriorPicsFlag if (m_apcSlicePilot->getRapPicFlag()) { if ((m_apcSlicePilot->getNalUnitType() >= NAL_UNIT_CODED_SLICE_BLA_W_LP && m_apcSlicePilot->getNalUnitType() <= NAL_UNIT_CODED_SLICE_IDR_N_LP) || (m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_CRA && m_bFirstSliceInSequence) || (m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_CRA && m_apcSlicePilot->getHandleCraAsBlaFlag())) { m_apcSlicePilot->setNoRaslOutputFlag(true); } //the inference for NoOutputPriorPicsFlag if (!m_bFirstSliceInBitstream && m_apcSlicePilot->getRapPicFlag() && m_apcSlicePilot->getNoRaslOutputFlag()) { if (m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_CRA) { m_apcSlicePilot->setNoOutputPriorPicsFlag(true); } } else { m_apcSlicePilot->setNoOutputPriorPicsFlag(false); } if(m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_CRA) { m_craNoRaslOutputFlag = m_apcSlicePilot->getNoRaslOutputFlag(); } } if (m_apcSlicePilot->getRapPicFlag() && m_apcSlicePilot->getNoOutputPriorPicsFlag()) { m_lastPOCNoOutputPriorPics = m_apcSlicePilot->getPOC(); m_isNoOutputPriorPics = true; } else { m_isNoOutputPriorPics = false; } //For inference of PicOutputFlag if (m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_RASL_N || m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_RASL_R) { if ( m_craNoRaslOutputFlag ) { m_apcSlicePilot->setPicOutputFlag(false); } }#endif#if FIX_POC_CRA_NORASL_OUTPUT if (m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_CRA && m_craNoRaslOutputFlag) //Reset POC MSB when CRA has NoRaslOutputFlag equal to 1 { Int iMaxPOClsb = 1 << m_apcSlicePilot->getSPS()->getBitsForPOC(); m_apcSlicePilot->setPOC( m_apcSlicePilot->getPOC() & (iMaxPOClsb - 1) ); }#endif // Skip pictures due to random access if (isRandomAccessSkipPicture(iSkipFrame, iPOCLastDisplay)) { m_prevSliceSkipped = true; m_skippedPOC = m_apcSlicePilot->getPOC(); return false; } // Skip TFD pictures associated with BLA/BLANT pictures if (isSkipPictureForBLA(iPOCLastDisplay)) { m_prevSliceSkipped = true; m_skippedPOC = m_apcSlicePilot->getPOC(); return false; } // clear previous slice skipped flag m_prevSliceSkipped = false; //we should only get a different poc for a new picture (with CTU address==0) if (m_apcSlicePilot->isNextSlice() && m_apcSlicePilot->getPOC()!=m_prevPOC && !m_bFirstSliceInSequence && (m_apcSlicePilot->getSliceCurStartCUAddr()!=0)) { printf ("Warning, the first slice of a picture might have been lost!\n"); } // exit when a new picture is found if (m_apcSlicePilot->isNextSlice() && (m_apcSlicePilot->getSliceCurStartCUAddr() == 0 && !m_bFirstSliceInPicture) && !m_bFirstSliceInSequence ) { if (m_prevPOC >= m_pocRandomAccess) { m_prevPOC = m_apcSlicePilot->getPOC(); return true; } m_prevPOC = m_apcSlicePilot->getPOC(); } // actual decoding starts here xActivateParameterSets(); if (m_apcSlicePilot->isNextSlice()) { m_prevPOC = m_apcSlicePilot->getPOC(); } m_bFirstSliceInSequence = false;#if SETTING_NO_OUT_PIC_PRIOR m_bFirstSliceInBitstream = false;#endif //detect lost reference picture and insert copy of earlier frame. Int lostPoc; while((lostPoc=m_apcSlicePilot->checkThatAllRefPicsAreAvailable(m_cListPic, m_apcSlicePilot->getRPS(), true, m_pocRandomAccess)) > 0) { xCreateLostPicture(lostPoc-1); } if (m_bFirstSliceInPicture) { // Buffer initialize for prediction. m_cPrediction.initTempBuff(); m_apcSlicePilot->applyReferencePictureSet(m_cListPic, m_apcSlicePilot->getRPS()); // Get a new picture buffer xGetNewPicBuffer (m_apcSlicePilot, pcPic); Bool isField = false; Bool isTff = false; if(!m_SEIs.empty()) { // Check if any new Picture Timing SEI has arrived SEIMessages pictureTimingSEIs = extractSeisByType (m_SEIs, SEI::PICTURE_TIMING); if (pictureTimingSEIs.size()>0) { SEIPictureTiming* pictureTiming = (SEIPictureTiming*) *(pictureTimingSEIs.begin()); isField = (pictureTiming->m_picStruct == 1) || (pictureTiming->m_picStruct == 2); isTff = (pictureTiming->m_picStruct == 1); } } //Set Field/Frame coding mode m_pcPic->setField(isField); m_pcPic->setTopField(isTff); // transfer any SEI messages that have been received to the picture pcPic->setSEIs(m_SEIs); m_SEIs.clear(); // Recursive structure m_cCuDecoder.create ( g_uiMaxCUDepth, g_uiMaxCUWidth, g_uiMaxCUHeight ); m_cCuDecoder.init ( &m_cEntropyDecoder, &m_cTrQuant, &m_cPrediction ); m_cTrQuant.init ( g_uiMaxCUWidth, g_uiMaxCUHeight, m_apcSlicePilot->getSPS()->getMaxTrSize()); m_cSliceDecoder.create(); } else { // Check if any new SEI has arrived if(!m_SEIs.empty()) { // Currently only decoding Unit SEI message occurring between VCL NALUs copied SEIMessages &picSEI = pcPic->getSEIs(); SEIMessages decodingUnitInfos = extractSeisByType (m_SEIs, SEI::DECODING_UNIT_INFO); picSEI.insert(picSEI.end(), decodingUnitInfos.begin(), decodingUnitInfos.end()); deleteSEIs(m_SEIs); } } // Set picture slice pointer TComSlice* pcSlice = m_apcSlicePilot; Bool bNextSlice = pcSlice->isNextSlice(); UInt i; pcPic->getPicSym()->initTiles(pcSlice->getPPS()); //generate the Coding Order Map and Inverse Coding Order Map UInt uiEncCUAddr; for(i=0, uiEncCUAddr=0; i<pcPic->getPicSym()->getNumberOfCUsInFrame(); i++, uiEncCUAddr = pcPic->getPicSym()->xCalculateNxtCUAddr(uiEncCUAddr)) { pcPic->getPicSym()->setCUOrderMap(i, uiEncCUAddr); pcPic->getPicSym()->setInverseCUOrderMap(uiEncCUAddr, i); } pcPic->getPicSym()->setCUOrderMap(pcPic->getPicSym()->getNumberOfCUsInFrame(), pcPic->getPicSym()->getNumberOfCUsInFrame()); pcPic->getPicSym()->setInverseCUOrderMap(pcPic->getPicSym()->getNumberOfCUsInFrame(), pcPic->getPicSym()->getNumberOfCUsInFrame()); //convert the start and end CU addresses of the slice and dependent slice into encoding order pcSlice->setSliceSegmentCurStartCUAddr( pcPic->getPicSym()->getPicSCUEncOrder(pcSlice->getSliceSegmentCurStartCUAddr()) ); pcSlice->setSliceSegmentCurEndCUAddr( pcPic->getPicSym()->getPicSCUEncOrder(pcSlice->getSliceSegmentCurEndCUAddr()) ); if(pcSlice->isNextSlice()) { pcSlice->setSliceCurStartCUAddr(pcPic->getPicSym()->getPicSCUEncOrder(pcSlice->getSliceCurStartCUAddr())); pcSlice->setSliceCurEndCUAddr(pcPic->getPicSym()->getPicSCUEncOrder(pcSlice->getSliceCurEndCUAddr())); } if (m_bFirstSliceInPicture) { if(pcPic->getNumAllocatedSlice() != 1) { pcPic->clearSliceBuffer(); } } else { pcPic->allocateNewSlice(); } assert(pcPic->getNumAllocatedSlice() == (m_uiSliceIdx + 1)); m_apcSlicePilot = pcPic->getPicSym()->getSlice(m_uiSliceIdx); pcPic->getPicSym()->setSlice(pcSlice, m_uiSliceIdx); pcPic->setTLayer(nalu.m_temporalId); if (bNextSlice) { pcSlice->checkCRA(pcSlice->getRPS(), m_pocCRA, m_associatedIRAPType, m_cListPic ); // Set reference list pcSlice->setRefPicList( m_cListPic, true ); // For generalized B // note: maybe not existed case (always L0 is copied to L1 if L1 is empty) if (pcSlice->isInterB() && pcSlice->getNumRefIdx(REF_PIC_LIST_1) == 0) { Int iNumRefIdx = pcSlice->getNumRefIdx(REF_PIC_LIST_0); pcSlice->setNumRefIdx ( REF_PIC_LIST_1, iNumRefIdx ); for (Int iRefIdx = 0; iRefIdx < iNumRefIdx; iRefIdx++) { pcSlice->setRefPic(pcSlice->getRefPic(REF_PIC_LIST_0, iRefIdx), REF_PIC_LIST_1, iRefIdx); } } if (!pcSlice->isIntra()) { Bool bLowDelay = true; Int iCurrPOC = pcSlice->getPOC(); Int iRefIdx = 0; for (iRefIdx = 0; iRefIdx < pcSlice->getNumRefIdx(REF_PIC_LIST_0) && bLowDelay; iRefIdx++) { if ( pcSlice->getRefPic(REF_PIC_LIST_0, iRefIdx)->getPOC() > iCurrPOC ) { bLowDelay = false; } } if (pcSlice->isInterB()) { for (iRefIdx = 0; iRefIdx < pcSlice->getNumRefIdx(REF_PIC_LIST_1) && bLowDelay; iRefIdx++) { if ( pcSlice->getRefPic(REF_PIC_LIST_1, iRefIdx)->getPOC() > iCurrPOC ) { bLowDelay = false; } } } pcSlice->setCheckLDC(bLowDelay); } //--------------- pcSlice->setRefPOCList(); } pcPic->setCurrSliceIdx(m_uiSliceIdx); if(pcSlice->getSPS()->getScalingListFlag()) { pcSlice->setScalingList ( pcSlice->getSPS()->getScalingList() ); if(pcSlice->getPPS()->getScalingListPresentFlag()) { pcSlice->setScalingList ( pcSlice->getPPS()->getScalingList() ); } if(!pcSlice->getPPS()->getScalingListPresentFlag() && !pcSlice->getSPS()->getScalingListPresentFlag()) { pcSlice->setDefaultScalingList(); } m_cTrQuant.setScalingListDec(pcSlice->getScalingList()); m_cTrQuant.setUseScalingList(true); } else { m_cTrQuant.setFlatScalingList(); m_cTrQuant.setUseScalingList(false); } // Decode a picture m_cGopDecoder.decompressSlice(nalu.m_Bitstream, pcPic); m_bFirstSliceInPicture = false; m_uiSliceIdx++; return false;} 0 0
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