HEVC代码追踪（十四）:解码之xDecodeSlice

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;

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