DecLib.cpp

    // RdCost
    m_cRdCost.setCostMode ( COST_STANDARD_LOSSY ); // not used in decoder side RdCost stuff -> set to default

    m_cSliceDecoder.create();

    if( sps->getALFEnabledFlag() )
    {
#if JVET_O1164_PS
      m_cALF.create( pps->getPicWidthInLumaSamples(), pps->getPicHeightInLumaSamples(), sps->getChromaFormatIdc(), sps->getMaxCUWidth(), sps->getMaxCUHeight(), sps->getMaxCodingDepth(), sps->getBitDepths().recon );
#else
      m_cALF.create( sps->getPicWidthInLumaSamples(), sps->getPicHeightInLumaSamples(), sps->getChromaFormatIdc(), sps->getMaxCUWidth(), sps->getMaxCUHeight(), sps->getMaxCodingDepth(), sps->getBitDepths().recon );
#endif
    }
  }
  else
  {
    // make the slice-pilot a real slice, and set up the slice-pilot for the next slice
    m_pcPic->allocateNewSlice();
    CHECK(m_pcPic->slices.size() != (size_t)(m_uiSliceSegmentIdx + 1), "Invalid number of slices");
    m_apcSlicePilot = m_pcPic->swapSliceObject(m_apcSlicePilot, m_uiSliceSegmentIdx);

    Slice *pSlice = m_pcPic->slices[m_uiSliceSegmentIdx]; // we now have a real slice.

    const SPS *sps = pSlice->getSPS();
    const PPS *pps = pSlice->getPPS();
    APS** apss = pSlice->getAlfAPSs();
    APS *lmcsAPS = pSlice->getLmcsAPS();
#if JVET_O0299_APS_SCALINGLIST
    APS *scalinglistAPS = pSlice->getscalingListAPS();
#endif

    // fix Parameter Sets, now that we have the real slice
    m_pcPic->cs->slice = pSlice;
    m_pcPic->cs->sps   = sps;
    m_pcPic->cs->pps   = pps;
    memcpy(m_pcPic->cs->alfApss, apss, sizeof(m_pcPic->cs->alfApss));
    m_pcPic->cs->lmcsAps = lmcsAPS;
#if JVET_O0299_APS_SCALINGLIST
    m_pcPic->cs->scalinglistAps = scalinglistAPS;
#endif

    m_pcPic->cs->pcv   = pps->pcv;

    // check that the current active PPS has not changed...
    if (m_parameterSetManager.getSPSChangedFlag(sps->getSPSId()) )
    {
      EXIT("Error - a new SPS has been decoded while processing a picture");
    }
    if (m_parameterSetManager.getPPSChangedFlag(pps->getPPSId()) )
    {
      EXIT("Error - a new PPS has been decoded while processing a picture");
    }
#if JVET_O_MAX_NUM_ALF_APS_8
    for (int i = 0; i < ALF_CTB_MAX_NUM_APS; i++)
#else
    for (int i = 0; i < MAX_NUM_APS; i++)
#endif
    {
      APS* aps = m_parameterSetManager.getAPS(i, ALF_APS);
      if (aps && m_parameterSetManager.getAPSChangedFlag(i, ALF_APS))
      {
        EXIT("Error - a new APS has been decoded while processing a picture");
      }
    }

    if (lmcsAPS && m_parameterSetManager.getAPSChangedFlag(lmcsAPS->getAPSId(), LMCS_APS) )
    {
      EXIT("Error - a new LMCS APS has been decoded while processing a picture");
    }
#if JVET_O0299_APS_SCALINGLIST
    if( scalinglistAPS && m_parameterSetManager.getAPSChangedFlag( scalinglistAPS->getAPSId(), SCALING_LIST_APS ) )
    {
      EXIT( "Error - a new SCALING LIST APS has been decoded while processing a picture" );
    }
#endif

#if JVET_O0299_APS_SCALINGLIST
    activateAPS(pSlice, m_parameterSetManager, apss, lmcsAPS, scalinglistAPS);
#else
    activateAPS(pSlice, m_parameterSetManager, apss, lmcsAPS);
#endif

    m_pcPic->cs->lmcsAps = lmcsAPS;
#if JVET_O0299_APS_SCALINGLIST
    m_pcPic->cs->scalinglistAps = scalinglistAPS;
#endif

    xParsePrefixSEImessages();

    // Check if any new SEI has arrived
     if(!m_SEIs.empty())
     {
       // Currently only decoding Unit SEI message occurring between VCL NALUs copied
       SEIMessages& picSEI = m_pcPic->SEIs;
       SEIMessages decodingUnitInfos = extractSeisByType( picSEI, SEI::DECODING_UNIT_INFO);
       picSEI.insert(picSEI.end(), decodingUnitInfos.begin(), decodingUnitInfos.end());
       deleteSEIs(m_SEIs);
     }
  }

  // Conformance checks
#if JVET_O0244_DELTA_POC
  Slice *pSlice = m_pcPic->slices[m_uiSliceSegmentIdx];
  const SPS *sps = pSlice->getSPS();
  const PPS *pps = pSlice->getPPS();

  if( !sps->getUseWP() )
  {
    CHECK( pps->getUseWP(), "When sps_weighted_pred_flag is equal to 0, the value of pps_weighted_pred_flag shall be equal to 0." );
  }

  if( !sps->getUseWPBiPred() )
  {
    CHECK( pps->getWPBiPred(), "When sps_weighted_bipred_flag is equal to 0, the value of pps_weighted_bipred_flag shall be equal to 0." );
  }
#endif

#if JVET_O1164_PS
#if JVET_O0640_PICTURE_SIZE_CONSTRAINT
  CHECK( ( pps->getPicWidthInLumaSamples() % ( std::max( 8, int( sps->getMaxCUWidth() >> ( sps->getMaxCodingDepth() - 1 ) ) ) ) ) != 0, "Coded frame width must be a multiple of Max(8, the minimum unit size)" );
  CHECK( ( pps->getPicHeightInLumaSamples() % ( std::max( 8, int( sps->getMaxCUHeight() >> ( sps->getMaxCodingDepth() - 1 ) ) ) ) ) != 0, "Coded frame height must be a multiple of Max(8, the minimum unit size)" );
#endif

  if( sps->getCTUSize() + 2 * ( 1 << sps->getLog2MinCodingBlockSize() ) > pps->getPicWidthInLumaSamples() )
  {    
    CHECK( sps->getWrapAroundEnabledFlag(), "Wraparound shall be disabled when the value of ( CtbSizeY / MinCbSizeY + 1) is less than or equal to ( pic_width_in_luma_samples / MinCbSizeY - 1 )" );
  }
#endif
}


void DecLib::xParsePrefixSEIsForUnknownVCLNal()
{
  while (!m_prefixSEINALUs.empty())
  {
    // do nothing?
    msg( NOTICE, "Discarding Prefix SEI associated with unknown VCL NAL unit.\n");
    delete m_prefixSEINALUs.front();
  }
  // TODO: discard following suffix SEIs as well?
}


void DecLib::xParsePrefixSEImessages()
{
  while (!m_prefixSEINALUs.empty())
  {
    InputNALUnit &nalu=*m_prefixSEINALUs.front();
#if !JVET_N0867_TEMP_SCAL_HRD
    m_seiReader.parseSEImessage( &(nalu.getBitstream()), m_SEIs, nalu.m_nalUnitType, m_parameterSetManager.getActiveSPS(), m_HRD, m_pDecodedSEIOutputStream );
#else
    m_seiReader.parseSEImessage( &(nalu.getBitstream()), m_SEIs, nalu.m_nalUnitType, nalu.m_temporalId, m_parameterSetManager.getActiveSPS(), m_HRD, m_pDecodedSEIOutputStream );
#endif
    delete m_prefixSEINALUs.front();
    m_prefixSEINALUs.pop_front();
  }
}


bool DecLib::xDecodeSlice(InputNALUnit &nalu, int &iSkipFrame, int iPOCLastDisplay )
{
  m_apcSlicePilot->initSlice(); // the slice pilot is an object to prepare for a new slice
                                // it is not associated with picture, sps or pps structures.

#if JVET_O1164_RPR
  Picture* scaledRefPic[MAX_NUM_REF] = {};
#endif

  if (m_bFirstSliceInPicture)
  {
    m_uiSliceSegmentIdx = 0;
  }
  else
  {
    m_apcSlicePilot->copySliceInfo( m_pcPic->slices[m_uiSliceSegmentIdx-1] );
  }

  m_apcSlicePilot->setSliceCurStartCtuTsAddr(0);
  m_apcSlicePilot->setSliceCurEndCtuTsAddr(0);
  m_apcSlicePilot->setSliceCurStartBrickIdx(0);
  m_apcSlicePilot->setSliceCurEndBrickIdx(0);
  m_apcSlicePilot->setNalUnitType(nalu.m_nalUnitType);
  m_apcSlicePilot->setTLayer(nalu.m_temporalId);

#if JVET_N0865_NONSYNTAX
  if (nalu.m_nalUnitType == NAL_UNIT_CODED_SLICE_GDR)
    CHECK(nalu.m_temporalId != 0, "Current GDR picture has TemporalId not equal to 0");
#endif

  m_HLSReader.setBitstream( &nalu.getBitstream() );
  m_HLSReader.parseSliceHeader( m_apcSlicePilot, &m_parameterSetManager, m_prevTid0POC );

  // update independent slice index
  uint32_t uiIndependentSliceIdx = 0;
  if (!m_bFirstSliceInPicture)
  {
    uiIndependentSliceIdx = m_pcPic->slices[m_uiSliceSegmentIdx-1]->getIndependentSliceIdx();
      uiIndependentSliceIdx++;
  }
  m_apcSlicePilot->setIndependentSliceIdx(uiIndependentSliceIdx);

#if K0149_BLOCK_STATISTICS
  PPS *pps = m_parameterSetManager.getPPS(m_apcSlicePilot->getPPSId());
  CHECK(pps == 0, "No PPS present");
  SPS *sps = m_parameterSetManager.getSPS(pps->getSPSId());
  CHECK(sps == 0, "No SPS present");

  writeBlockStatisticsHeader(sps);
#endif

  DTRACE_UPDATE( g_trace_ctx, std::make_pair( "poc", m_apcSlicePilot->getPOC() ) );


  xUpdatePreviousTid0POC(m_apcSlicePilot);

  m_apcSlicePilot->setAssociatedIRAPPOC(m_pocCRA);
  m_apcSlicePilot->setAssociatedIRAPType(m_associatedIRAPType);

  //For inference of NoOutputOfPriorPicsFlag
#if JVET_N0865_NONSYNTAX
  if (m_apcSlicePilot->getRapPicFlag() || m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_GDR)
#else
  if (m_apcSlicePilot->getRapPicFlag())
#endif
  {
#if JVET_N0865_NONSYNTAX
    if ((m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_CRA && m_bFirstSliceInSequence) ||
        (m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_CRA && m_apcSlicePilot->getHandleCraAsCvsStartFlag()) || 
        (m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_GDR && m_bFirstSliceInSequence))
    {
      m_apcSlicePilot->setNoIncorrectPicOutputFlag(true);
    }
#else
    if ((m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_CRA && m_bFirstSliceInSequence) ||
        (m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_CRA && m_apcSlicePilot->getHandleCraAsCvsStartFlag()))
    {
      m_apcSlicePilot->setNoRaslOutputFlag(true);
    }
#endif
    //the inference for NoOutputPriorPicsFlag
#if JVET_N0865_NONSYNTAX
    if (!m_bFirstSliceInBitstream &&
        (m_apcSlicePilot->getRapPicFlag() || m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_GDR) &&
        m_apcSlicePilot->getNoIncorrectPicOutputFlag())
    {
      if (m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_CRA || m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_GDR)
      {
        m_apcSlicePilot->setNoOutputPriorPicsFlag(true);
      }
    }
#else
    if (!m_bFirstSliceInBitstream && m_apcSlicePilot->getRapPicFlag() && m_apcSlicePilot->getNoRaslOutputFlag())
    {
      if (m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_CRA)
      {
        m_apcSlicePilot->setNoOutputPriorPicsFlag(true);
      }
    }
#endif
    else
    {
      m_apcSlicePilot->setNoOutputPriorPicsFlag(false);
    }

#if JVET_N0865_NONSYNTAX
    if (m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_CRA || m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_GDR)
    {
      m_lastNoIncorrectPicOutputFlag = m_apcSlicePilot->getNoIncorrectPicOutputFlag();
    }
#else
    if(m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_CRA)
    {
      m_craNoRaslOutputFlag = m_apcSlicePilot->getNoRaslOutputFlag();
    }
#endif
  }
#if JVET_N0865_NONSYNTAX
  if ((m_apcSlicePilot->getRapPicFlag() || m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_GDR) && m_apcSlicePilot->getNoOutputPriorPicsFlag())
#else
  if (m_apcSlicePilot->getRapPicFlag() && m_apcSlicePilot->getNoOutputPriorPicsFlag())
#endif
  {
    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)
  {
#if JVET_N0865_NONSYNTAX
    if (m_lastNoIncorrectPicOutputFlag)
#else
    if ( m_craNoRaslOutputFlag )
#endif
    {
      m_apcSlicePilot->setPicOutputFlag(false);
    }
  }

#if JVET_N0865_NONSYNTAX
  if ((m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_CRA || m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_GDR) &&
      m_lastNoIncorrectPicOutputFlag)                     //Reset POC MSB when CRA or GDR has NoIncorrectPicOutputFlag equal to 1
#else
  if (m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_CRA && m_craNoRaslOutputFlag) //Reset POC MSB when CRA has NoRaslOutputFlag equal to 1
#endif
  {
    PPS *pps = m_parameterSetManager.getPPS(m_apcSlicePilot->getPPSId());
    CHECK(pps == 0, "No PPS present");
    SPS *sps = m_parameterSetManager.getSPS(pps->getSPSId());
    CHECK(sps == 0, "No SPS present");
    int iMaxPOClsb = 1 << sps->getBitsForPOC();
    m_apcSlicePilot->setPOC( m_apcSlicePilot->getPOC() & (iMaxPOClsb - 1) );
    xUpdatePreviousTid0POC(m_apcSlicePilot);
  }

  // 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

  // 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->getPOC() != m_prevPOC && !m_bFirstSliceInSequence && (m_apcSlicePilot->getSliceCurStartCtuTsAddr() != 0))
  {
    msg( WARNING, "Warning, the first slice of a picture might have been lost!\n");
  }

  // leave when a new picture is found
  if(m_apcSlicePilot->getSliceCurStartCtuTsAddr() == 0 && !m_bFirstSliceInPicture)
  {
    if (m_prevPOC >= m_pocRandomAccess)
    {
      DTRACE_UPDATE( g_trace_ctx, std::make_pair( "final", 0 ) );
      m_prevPOC = m_apcSlicePilot->getPOC();
      return true;
    }
    m_prevPOC = m_apcSlicePilot->getPOC();
  }
  else
  {
    DTRACE_UPDATE( g_trace_ctx, std::make_pair( "final", 1 ) );
  }

  //detect lost reference picture and insert copy of earlier frame.
  {
    int lostPoc;
    while ((lostPoc = m_apcSlicePilot->checkThatAllRefPicsAreAvailable(m_cListPic, m_apcSlicePilot->getRPL0(), 0, true)) > 0)
      xCreateLostPicture(lostPoc - 1);
    while ((lostPoc = m_apcSlicePilot->checkThatAllRefPicsAreAvailable(m_cListPic, m_apcSlicePilot->getRPL1(), 1, true)) > 0)
      xCreateLostPicture(lostPoc - 1);
  }

    m_prevPOC = m_apcSlicePilot->getPOC();

  if (m_bFirstSliceInPicture)
  {
    xUpdateRasInit(m_apcSlicePilot);
  }

  // actual decoding starts here
  xActivateParameterSets();

  m_bFirstSliceInSequence = false;
  m_bFirstSliceInBitstream  = false;


  Slice* pcSlice = m_pcPic->slices[m_uiSliceSegmentIdx];
  pcSlice->setPic( m_pcPic );
  m_pcPic->poc         = pcSlice->getPOC();
  m_pcPic->layer       = pcSlice->getTLayer();
  m_pcPic->referenced  = true;
  m_pcPic->layer       = nalu.m_temporalId;

  // When decoding the slice header, the stored start and end addresses were actually RS addresses, not TS addresses.
  // Now, having set up the maps, convert them to the correct form.
  const BrickMap& tileMap = *(m_pcPic->brickMap);
  const uint32_t numberOfCtusInFrame = m_pcPic->cs->pcv->sizeInCtus;

  uint32_t startCtuIdx = 0;
  while (pcSlice->getSliceCurStartBrickIdx() != tileMap.getBrickIdxBsMap(startCtuIdx) && startCtuIdx < numberOfCtusInFrame)
  {
    startCtuIdx++;
  }
  uint32_t endCtuIdx = startCtuIdx;
  while (pcSlice->getSliceCurEndBrickIdx() != tileMap.getBrickIdxBsMap(endCtuIdx) && endCtuIdx < numberOfCtusInFrame)
  {
    endCtuIdx++;
  }
  if (endCtuIdx == numberOfCtusInFrame)
    EXIT("Cannot find the last CTU index of the current slice");

  while ( (endCtuIdx < numberOfCtusInFrame) && (pcSlice->getSliceCurEndBrickIdx() == tileMap.getBrickIdxBsMap(endCtuIdx)) )
  {
    endCtuIdx++;
  }
  if (pcSlice->getSliceCurEndBrickIdx() != tileMap.getBrickIdxBsMap(endCtuIdx - 1))
    EXIT("Cannot find the last CTU index of the current slice");

  pcSlice->setSliceCurStartCtuTsAddr(startCtuIdx);
  pcSlice->setSliceCurEndCtuTsAddr(endCtuIdx);

  pcSlice->checkCRA(pcSlice->getRPL0(), pcSlice->getRPL1(), m_pocCRA, m_associatedIRAPType, m_cListPic);
  pcSlice->constructRefPicList(m_cListPic);

#if JVET_O1164_RPR
#if JVET_O0299_APS_SCALINGLIST
  pcSlice->scaleRefPicList( scaledRefPic, m_parameterSetManager.getAPSs(), pcSlice->getLmcsAPS(), pcSlice->getscalingListAPS(), true );
#else
  pcSlice->scaleRefPicList( scaledRefPic, m_parameterSetManager.getAPSs(), pcSlice->getLmcsAPS(), true );
#endif
#endif

    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);
    }

    if (pcSlice->getSPS()->getUseSMVD() && pcSlice->getCheckLDC() == false
#if JVET_O0284_CONDITION_SMVD_MVDL1ZEROFLAG
      && pcSlice->getMvdL1ZeroFlag() == false
#endif
      )
    {
      int currPOC = pcSlice->getPOC();

      int forwardPOC = currPOC;
      int backwardPOC = currPOC;
      int ref = 0;
      int refIdx0 = -1;
      int refIdx1 = -1;

      // search nearest forward POC in List 0
      for ( ref = 0; ref < pcSlice->getNumRefIdx( REF_PIC_LIST_0 ); ref++ )
      {
        int poc = pcSlice->getRefPic( REF_PIC_LIST_0, ref )->getPOC();
#if JVET_O0414_SMVD_LTRP
        const bool isRefLongTerm = pcSlice->getRefPic(REF_PIC_LIST_0, ref)->longTerm;
        if ( poc < currPOC && (poc > forwardPOC || refIdx0 == -1) && !isRefLongTerm )
#else
        if ( poc < currPOC && (poc > forwardPOC || refIdx0 == -1) )
#endif
        {
          forwardPOC = poc;
          refIdx0 = ref;
        }
      }

      // search nearest backward POC in List 1
      for ( ref = 0; ref < pcSlice->getNumRefIdx( REF_PIC_LIST_1 ); ref++ )
      {
        int poc = pcSlice->getRefPic( REF_PIC_LIST_1, ref )->getPOC();
#if JVET_O0414_SMVD_LTRP
        const bool isRefLongTerm = pcSlice->getRefPic(REF_PIC_LIST_1, ref)->longTerm;
        if ( poc > currPOC && (poc < backwardPOC || refIdx1 == -1) && !isRefLongTerm )
#else
        if ( poc > currPOC && (poc < backwardPOC || refIdx1 == -1) )
#endif
        {
          backwardPOC = poc;
          refIdx1 = ref;
        }
      }

      if ( !(forwardPOC < currPOC && backwardPOC > currPOC) )
      {
        forwardPOC = currPOC;
        backwardPOC = currPOC;
        refIdx0 = -1;
        refIdx1 = -1;

        // search nearest backward POC in List 0
        for ( ref = 0; ref < pcSlice->getNumRefIdx( REF_PIC_LIST_0 ); ref++ )
        {
          int poc = pcSlice->getRefPic( REF_PIC_LIST_0, ref )->getPOC();
#if JVET_O0414_SMVD_LTRP
          const bool isRefLongTerm = pcSlice->getRefPic(REF_PIC_LIST_0, ref)->longTerm;
          if ( poc > currPOC && (poc < backwardPOC || refIdx0 == -1) && !isRefLongTerm )
#else
          if ( poc > currPOC && (poc < backwardPOC || refIdx0 == -1) )
#endif
          {
            backwardPOC = poc;
            refIdx0 = ref;
          }
        }

        // search nearest forward POC in List 1
        for ( ref = 0; ref < pcSlice->getNumRefIdx( REF_PIC_LIST_1 ); ref++ )
        {
          int poc = pcSlice->getRefPic( REF_PIC_LIST_1, ref )->getPOC();
#if JVET_O0414_SMVD_LTRP
          const bool isRefLongTerm = pcSlice->getRefPic(REF_PIC_LIST_1, ref)->longTerm;
          if ( poc < currPOC && (poc > forwardPOC || refIdx1 == -1) && !isRefLongTerm )
#else
          if ( poc < currPOC && (poc > forwardPOC || refIdx1 == -1) )
#endif
          {
            forwardPOC = poc;
            refIdx1 = ref;
          }
        }
      }

      if ( forwardPOC < currPOC && backwardPOC > currPOC )
      {
        pcSlice->setBiDirPred( true, refIdx0, refIdx1 );
      }
      else
      {
        pcSlice->setBiDirPred( false, -1, -1 );
      }
    }
    else
    {
      pcSlice->setBiDirPred( false, -1, -1 );
    }

    //---------------
    pcSlice->setRefPOCList();

#if JVET_N0494_DRAP
    SEIMessages drapSEIs = getSeisByType(m_pcPic->SEIs, SEI::DEPENDENT_RAP_INDICATION );
    if (!drapSEIs.empty())
    {
      msg( NOTICE, "Dependent RAP indication SEI decoded\n");
      pcSlice->setDRAP(true);
      pcSlice->setLatestDRAPPOC(pcSlice->getPOC());
    }
    pcSlice->checkConformanceForDRAP(nalu.m_temporalId);
#endif

  Quant *quant = m_cTrQuant.getQuant();

#if JVET_O0299_APS_SCALINGLIST
  if( pcSlice->getSPS()->getScalingListFlag() )
  {
    ScalingList scalingList;
    if( pcSlice->getscalingListPresentFlag() )
    {
      APS* scalingListAPS = pcSlice->getscalingListAPS();
      scalingList = scalingListAPS->getScalingList();
    }
    else
    {
      scalingList.setDefaultScalingList();
    }
    quant->setScalingListDec( scalingList );
    quant->setUseScalingList( true );
  }
  else
  {
    quant->setUseScalingList( false );
  }
#else
  if(pcSlice->getSPS()->getScalingListFlag())
  {
    ScalingList scalingList;
    if(pcSlice->getPPS()->getScalingListPresentFlag())
    {
      scalingList = pcSlice->getPPS()->getScalingList();
    }
    else if (pcSlice->getSPS()->getScalingListPresentFlag())
    {
      scalingList = pcSlice->getSPS()->getScalingList();
    }
    else
    {
      scalingList.setDefaultScalingList();
    }
    quant->setScalingListDec(scalingList);
    quant->setUseScalingList(true);
  }
  else
  {
    quant->setUseScalingList(false);
  }
#endif


  if (pcSlice->getSPS()->getUseReshaper())
  {
#if JVET_O0428_LMCS_CLEANUP
    if (m_bFirstSliceInPicture)
      m_sliceLmcsApsId = -1;
#endif
    if (pcSlice->getLmcsEnabledFlag())
    {
      APS* lmcsAPS = pcSlice->getLmcsAPS();
#if JVET_O0428_LMCS_CLEANUP
      if (m_sliceLmcsApsId == -1)
      {
        m_sliceLmcsApsId = lmcsAPS->getAPSId();
      }
      else
      {
        CHECK(lmcsAPS->getAPSId() != m_sliceLmcsApsId, "same APS ID shall be used for all slices in one picture");
      }
#endif
      SliceReshapeInfo& sInfo = lmcsAPS->getReshaperAPSInfo();
      SliceReshapeInfo& tInfo = m_cReshaper.getSliceReshaperInfo();
      tInfo.reshaperModelMaxBinIdx = sInfo.reshaperModelMaxBinIdx;
      tInfo.reshaperModelMinBinIdx = sInfo.reshaperModelMinBinIdx;
      memcpy(tInfo.reshaperModelBinCWDelta, sInfo.reshaperModelBinCWDelta, sizeof(int)*(PIC_CODE_CW_BINS));
      tInfo.maxNbitsNeededDeltaCW = sInfo.maxNbitsNeededDeltaCW;
      tInfo.setUseSliceReshaper(pcSlice->getLmcsEnabledFlag());
      tInfo.setSliceReshapeChromaAdj(pcSlice->getLmcsChromaResidualScaleFlag());
      tInfo.setSliceReshapeModelPresentFlag(true);
    }
    else
    {
      SliceReshapeInfo& tInfo = m_cReshaper.getSliceReshaperInfo();
      tInfo.setUseSliceReshaper(false);
      tInfo.setSliceReshapeChromaAdj(false);
      tInfo.setSliceReshapeModelPresentFlag(false);
    }
    if (pcSlice->getLmcsEnabledFlag())
    {
      m_cReshaper.constructReshaper();
    }
    else
    {
      m_cReshaper.setReshapeFlag(false);
    }
    if ((pcSlice->getSliceType() == I_SLICE) && m_cReshaper.getSliceReshaperInfo().getUseSliceReshaper())
    {
      m_cReshaper.setCTUFlag(false);
      m_cReshaper.setRecReshaped(true);
    }
    else
    {
      if (m_cReshaper.getSliceReshaperInfo().getUseSliceReshaper())
      {
        m_cReshaper.setCTUFlag(true);
        m_cReshaper.setRecReshaped(true);
      }
      else
      {
        m_cReshaper.setCTUFlag(false);
        m_cReshaper.setRecReshaped(false);
      }
    }
#if JVET_O1109_UNFIY_CRS
    m_cReshaper.setVPDULoc(-1, -1);
#endif
  }
  else
  {
    m_cReshaper.setCTUFlag(false);
    m_cReshaper.setRecReshaped(false);
  }

  //  Decode a picture
  m_cSliceDecoder.decompressSlice( pcSlice, &( nalu.getBitstream() ), ( m_pcPic->poc == getDebugPOC() ? getDebugCTU() : -1 ) );

  m_bFirstSliceInPicture = false;
  m_uiSliceSegmentIdx++;

#if JVET_O1164_RPR
  pcSlice->freeScaledRefPicList( scaledRefPic );
#endif

  return false;
}

void DecLib::xDecodeVPS( InputNALUnit& nalu )
{
  VPS* vps = new VPS();
  m_HLSReader.setBitstream( &nalu.getBitstream() );
  m_HLSReader.parseVPS( vps );
  delete vps;
}

void DecLib::xDecodeDPS( InputNALUnit& nalu )
{
  DPS* dps = new DPS();
  m_HLSReader.setBitstream( &nalu.getBitstream() );
  m_HLSReader.parseDPS( dps );
  m_parameterSetManager.storeDPS( dps, nalu.getBitstream().getFifo() );
}

void DecLib::xDecodeSPS( InputNALUnit& nalu )
{
  SPS* sps = new SPS();
  m_HLSReader.setBitstream( &nalu.getBitstream() );
  m_HLSReader.parseSPS( sps );
  m_parameterSetManager.storeSPS( sps, nalu.getBitstream().getFifo() );

  DTRACE( g_trace_ctx, D_QP_PER_CTU, "CTU Size: %dx%d", sps->getMaxCUWidth(), sps->getMaxCUHeight() );
}

void DecLib::xDecodePPS( InputNALUnit& nalu )
{
  PPS* pps = new PPS();
  m_HLSReader.setBitstream( &nalu.getBitstream() );
  m_HLSReader.parsePPS( pps, &m_parameterSetManager );
  m_parameterSetManager.storePPS( pps, nalu.getBitstream().getFifo() );
}

void DecLib::xDecodeAPS(InputNALUnit& nalu)
{
  APS* aps = new APS();
  m_HLSReader.setBitstream(&nalu.getBitstream());
  m_HLSReader.parseAPS(aps);
  aps->setTemporalId(nalu.m_temporalId);
  m_parameterSetManager.storeAPS(aps, nalu.getBitstream().getFifo());
}
bool DecLib::decode(InputNALUnit& nalu, int& iSkipFrame, int& iPOCLastDisplay)
{
  bool ret;
  // ignore all NAL units of layers > 0
  if (getTargetDecLayer() >= 0 && nalu.m_nuhLayerId != getTargetDecLayer()) //TBC: ignore bitstreams whose nuh_layer_id is not the target layer id
  {
    msg( WARNING, "Warning: found NAL unit with nuh_layer_id equal to %d. Ignoring.\n", nalu.m_nuhLayerId);
    return false;
  }

  switch (nalu.m_nalUnitType)
  {
    case NAL_UNIT_VPS:
      xDecodeVPS( nalu );
      return false;

    case NAL_UNIT_DPS:
      xDecodeDPS( nalu );
      return false;

    case NAL_UNIT_SPS:
      xDecodeSPS( nalu );
      return false;

    case NAL_UNIT_PPS:
      xDecodePPS( nalu );
      return false;
    case NAL_UNIT_APS:
      xDecodeAPS(nalu);
      return false;

    case NAL_UNIT_PREFIX_SEI:
      // Buffer up prefix SEI messages until SPS of associated VCL is known.
      m_prefixSEINALUs.push_back(new InputNALUnit(nalu));
      return false;

    case NAL_UNIT_SUFFIX_SEI:
      if (m_pcPic)
      {
#if !JVET_N0867_TEMP_SCAL_HRD
        m_seiReader.parseSEImessage( &(nalu.getBitstream()), m_pcPic->SEIs, nalu.m_nalUnitType, m_parameterSetManager.getActiveSPS(), m_HRD, m_pDecodedSEIOutputStream );
#else
        m_seiReader.parseSEImessage( &(nalu.getBitstream()), m_pcPic->SEIs, nalu.m_nalUnitType, nalu.m_temporalId, m_parameterSetManager.getActiveSPS(), m_HRD, m_pDecodedSEIOutputStream );
#endif
      }
      else
      {
        msg( NOTICE, "Note: received suffix SEI but no picture currently active.\n");
      }
      return false;

    case NAL_UNIT_CODED_SLICE_TRAIL:
    case NAL_UNIT_CODED_SLICE_STSA:
    case NAL_UNIT_CODED_SLICE_IDR_W_RADL:
    case NAL_UNIT_CODED_SLICE_IDR_N_LP:
    case NAL_UNIT_CODED_SLICE_CRA:
#if JVET_N0865_NONSYNTAX
    case NAL_UNIT_CODED_SLICE_GDR:
#endif
    case NAL_UNIT_CODED_SLICE_RADL:
    case NAL_UNIT_CODED_SLICE_RASL:
      ret = xDecodeSlice(nalu, iSkipFrame, iPOCLastDisplay);
#if JVET_J0090_MEMORY_BANDWITH_MEASURE
      if ( ret )
      {
        m_cacheModel.reportFrame( );
        m_cacheModel.accumulateFrame( );
        m_cacheModel.clear( );
      }
#endif
      return ret;

    case NAL_UNIT_EOS:
      m_associatedIRAPType = NAL_UNIT_INVALID;
      m_pocCRA = 0;
      m_pocRandomAccess = MAX_INT;
      m_prevPOC = MAX_INT;
      m_prevSliceSkipped = false;
      m_skippedPOC = 0;
      return false;

    case NAL_UNIT_ACCESS_UNIT_DELIMITER:
      {
        AUDReader audReader;
        uint32_t picType;
        audReader.parseAccessUnitDelimiter(&(nalu.getBitstream()),picType);
#if JVET_O0610_DETECT_AUD
        return !m_bFirstSliceInPicture;
#else
        msg( NOTICE, "Note: found NAL_UNIT_ACCESS_UNIT_DELIMITER\n");
        return false;
#endif
      }

    case NAL_UNIT_EOB:
      return false;

#if JVET_O0179
    case NAL_UNIT_RESERVED_IRAP_VCL_12:
    case NAL_UNIT_RESERVED_IRAP_VCL_13:
#else
    case NAL_UNIT_RESERVED_VCL_12:
    case NAL_UNIT_RESERVED_VCL_13:
#endif
    case NAL_UNIT_RESERVED_VCL_14:
    case NAL_UNIT_RESERVED_VCL_15:
      msg( NOTICE, "Note: found reserved VCL NAL unit.\n");
      xParsePrefixSEIsForUnknownVCLNal();
      return false;
#if JVET_O0179
    case NAL_UNIT_RESERVED_VCL_4:
    case NAL_UNIT_RESERVED_VCL_5:
    case NAL_UNIT_RESERVED_VCL_6:
    case NAL_UNIT_RESERVED_VCL_7:
    case NAL_UNIT_RESERVED_NVCL_26:
    case NAL_UNIT_RESERVED_NVCL_27:
#else
    case NAL_UNIT_RESERVED_NVCL_5:
    case NAL_UNIT_RESERVED_NVCL_6:
    case NAL_UNIT_RESERVED_NVCL_7:
    case NAL_UNIT_RESERVED_NVCL_21:
    case NAL_UNIT_RESERVED_NVCL_22:
    case NAL_UNIT_RESERVED_NVCL_23:
#endif
      msg( NOTICE, "Note: found reserved NAL unit.\n");
      return false;
    case NAL_UNIT_UNSPECIFIED_28:
    case NAL_UNIT_UNSPECIFIED_29:
    case NAL_UNIT_UNSPECIFIED_30:
    case NAL_UNIT_UNSPECIFIED_31:
      msg( NOTICE, "Note: found unspecified NAL unit.\n");
      return false;
    default:
      THROW( "Invalid NAL unit type" );
      break;
  }

  return false;
}


/** Function for checking if picture should be skipped because of random access. This function checks the skipping of pictures in the case of -s option random access.
 *  All pictures prior to the random access point indicated by the counter iSkipFrame are skipped.
 *  It also checks the type of Nal unit type at the random access point.
 *  If the random access point is CRA/CRANT/BLA/BLANT, TFD pictures with POC less than the POC of the random access point are skipped.
 *  If the random access point is IDR all pictures after the random access point are decoded.
 *  If the random access point is none of the above, a warning is issues, and decoding of pictures with POC
 *  equal to or greater than the random access point POC is attempted. For non IDR/CRA/BLA random
 *  access point there is no guarantee that the decoder will not crash.
 */
bool DecLib::isRandomAccessSkipPicture( int& iSkipFrame, int& iPOCLastDisplay )
{
  if (iSkipFrame)
  {
    iSkipFrame--;   // decrement the counter
    return true;
  }
  else if (m_pocRandomAccess == MAX_INT) // start of random access point, m_pocRandomAccess has not been set yet.
  {
    if (m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_CRA )
    {
      // set the POC random access since we need to skip the reordered pictures in the case of CRA/CRANT/BLA/BLANT.
      m_pocRandomAccess = m_apcSlicePilot->getPOC();
    }
    else if ( m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_IDR_W_RADL || m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_IDR_N_LP )
    {
      m_pocRandomAccess = -MAX_INT; // no need to skip the reordered pictures in IDR, they are decodable.
    }
    else
    {
      if(!m_warningMessageSkipPicture)
      {
        msg( WARNING, "\nWarning: this is not a valid random access point and the data is discarded until the first CRA picture");
        m_warningMessageSkipPicture = true;
      }
      return true;
    }
  }
  // skip the reordered pictures, if necessary
  else if (m_apcSlicePilot->getPOC() < m_pocRandomAccess && (m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_RASL))
  {
    iPOCLastDisplay++;
    return true;
  }
  // if we reach here, then the picture is not skipped.
  return false;
}




//! \}