EncCu.cpp

  {
    m_CurrCtx = m_CtxBuffer.data();
  }

  m_pcInterSearch->copyState( *other->m_pcInterSearch );
  m_modeCtrl     ->copyState( *other->m_modeCtrl, partitioner.currArea() );
  m_pcRdCost     ->copyState( *other->m_pcRdCost );
  m_pcTrQuant    ->copyState( *other->m_pcTrQuant );

  m_CABACEstimator->getCtx() = other->m_CABACEstimator->getCtx();
}
#endif

void EncCu::xCheckModeSplit(CodingStructure *&tempCS, CodingStructure *&bestCS, Partitioner &partitioner, const EncTestMode& encTestMode
#if JVET_L0266_HMVP
  , LutMotionCand* &tempMotCandLUTs
  , LutMotionCand* &bestMotCandLUTs
  , UnitArea  parArea
#endif
)
{
  const int qp                = encTestMode.qp;
  const PPS &pps              = *tempCS->pps;
  const Slice &slice          = *tempCS->slice;
  const bool bIsLosslessMode  = false; // False at this level. Next level down may set it to true.
  const int oldPrevQp         = tempCS->prevQP[partitioner.chType];
  const uint32_t currDepth        = partitioner.currDepth;

#if JVET_L0266_HMVP
  const unsigned wParIdx = gp_sizeIdxInfo->idxFrom(parArea.lwidth());
  const unsigned hParIdx = gp_sizeIdxInfo->idxFrom(parArea.lheight());

  tempCS->slice->copyMotionLUTs(tempMotCandLUTs, m_pSplitTempMotLUTs[wParIdx][hParIdx]);
#endif

  const PartSplit split = getPartSplit( encTestMode );

  CHECK( split == CU_DONT_SPLIT, "No proper split provided!" );

  tempCS->initStructData( qp, bIsLosslessMode );

  m_CABACEstimator->getCtx() = m_CurrCtx->start;

  if( tempCS->sps->getSpsNext().getUseQTBT() )
  {
    const TempCtx ctxStartSP( m_CtxCache, SubCtx( Ctx::SplitFlag,   m_CABACEstimator->getCtx() ) );
    const TempCtx ctxStartBT( m_CtxCache, SubCtx( Ctx::BTSplitFlag, m_CABACEstimator->getCtx() ) );

    m_CABACEstimator->resetBits();

    if( partitioner.getImplicitSplit( *tempCS ) != CU_QUAD_SPLIT )
    {
      if( partitioner.canSplit( CU_QUAD_SPLIT, *tempCS ) )
      {
        m_CABACEstimator->split_cu_flag( split == CU_QUAD_SPLIT, *tempCS, partitioner );
      }
      if( split != CU_QUAD_SPLIT )
      {
        m_CABACEstimator->split_cu_mode_mt( split, *tempCS, partitioner );
      }
    }

    const double factor = ( tempCS->currQP[partitioner.chType] > 30 ? 1.1 : 1.075 );
    const double cost   = m_pcRdCost->calcRdCost( uint64_t( m_CABACEstimator->getEstFracBits() + ( ( bestCS->fracBits ) / factor ) ), Distortion( bestCS->dist / factor ) );

    m_CABACEstimator->getCtx() = SubCtx( Ctx::SplitFlag,   ctxStartSP );
    m_CABACEstimator->getCtx() = SubCtx( Ctx::BTSplitFlag, ctxStartBT );

    if( cost > bestCS->cost )
    {
      xCheckBestMode( tempCS, bestCS, partitioner, encTestMode );
      return;
    }
  }

  partitioner.splitCurrArea( split, *tempCS );

  m_CurrCtx++;

  tempCS->getRecoBuf().fill( 0 );

  do
  {
    const auto &subCUArea  = partitioner.currArea();

    if( tempCS->picture->Y().contains( subCUArea.lumaPos() ) )
    {
      const unsigned wIdx    = gp_sizeIdxInfo->idxFrom( subCUArea.lwidth () );
      const unsigned hIdx    = gp_sizeIdxInfo->idxFrom( subCUArea.lheight() );

      CodingStructure *tempSubCS = m_pTempCS[wIdx][hIdx];
      CodingStructure *bestSubCS = m_pBestCS[wIdx][hIdx];

      tempCS->initSubStructure( *tempSubCS, partitioner.chType, subCUArea, false );
      tempCS->initSubStructure( *bestSubCS, partitioner.chType, subCUArea, false );
#if JVET_L0266_HMVP
      LutMotionCand *tempSubMotCandLUTs = m_pTempMotLUTs[wIdx][hIdx];
      LutMotionCand *bestSubMotCandLUTs = m_pBestMotLUTs[wIdx][hIdx];
      tempCS->slice->copyMotionLUTs(tempMotCandLUTs, tempSubMotCandLUTs);
      tempCS->slice->copyMotionLUTs(tempMotCandLUTs, bestSubMotCandLUTs);
#endif

      xCompressCU( tempSubCS, bestSubCS, partitioner
#if JVET_L0266_HMVP
        , tempSubMotCandLUTs
        , bestSubMotCandLUTs
#endif
      );

      if( bestSubCS->cost == MAX_DOUBLE )
      {
        CHECK( split == CU_QUAD_SPLIT, "Split decision reusing cannot skip quad split" );
        tempCS->cost = MAX_DOUBLE;
        m_CurrCtx--;
        partitioner.exitCurrSplit();
#if JVET_L0266_HMVP
        bool CSUpdated =
#endif
        xCheckBestMode( tempCS, bestCS, partitioner, encTestMode );

#if JVET_L0266_HMVP
        if (CSUpdated)
        {
          std::swap(tempMotCandLUTs, bestMotCandLUTs);
        }
#endif
        return;
      }

      bool keepResi = KEEP_PRED_AND_RESI_SIGNALS;
      tempCS->useSubStructure( *bestSubCS, partitioner.chType, CS::getArea( *tempCS, subCUArea, partitioner.chType ), KEEP_PRED_AND_RESI_SIGNALS, true, keepResi, keepResi );
#if JVET_L0266_HMVP
      tempCS->slice->copyMotionLUTs(bestSubMotCandLUTs, tempMotCandLUTs);
#endif

      if(currDepth < pps.getMaxCuDQPDepth())
      {
        tempCS->prevQP[partitioner.chType] = bestSubCS->prevQP[partitioner.chType];
      }

      tempSubCS->releaseIntermediateData();
      bestSubCS->releaseIntermediateData();
    }
  } while( partitioner.nextPart( *tempCS ) );

  partitioner.exitCurrSplit();

  m_CurrCtx--;

  // Finally, generate split-signaling bits for RD-cost check
  const PartSplit implicitSplit = partitioner.getImplicitSplit( *tempCS );

  {
    bool enforceQT = implicitSplit == CU_QUAD_SPLIT;
#if HM_QTBT_REPRODUCE_FAST_LCTU_BUG

    // LARGE CTU bug
    if( m_pcEncCfg->getQTBT() && m_pcEncCfg->getUseFastLCTU() )
    {
      unsigned minDepth = 0;
      unsigned maxDepth = g_aucLog2[tempCS->sps->getSpsNext().getCTUSize()] - g_aucLog2[tempCS->sps->getSpsNext().getMinQTSize( slice.getSliceType(), partitioner.chType )];

      if( auto ad = dynamic_cast<AdaptiveDepthPartitioner*>( &partitioner ) )
      {
        ad->setMaxMinDepth( minDepth, maxDepth, *tempCS );
      }

      if( minDepth > partitioner.currQtDepth )
      {
        // enforce QT
        enforceQT = true;
      }
    }
#endif

    if( !enforceQT )
    {
      m_CABACEstimator->resetBits();

      if( partitioner.canSplit( CU_QUAD_SPLIT, *tempCS ) )
      {
        m_CABACEstimator->split_cu_flag( split == CU_QUAD_SPLIT, *tempCS, partitioner );
      }
      if( split != CU_QUAD_SPLIT )
      {
        m_CABACEstimator->split_cu_mode_mt( split, *tempCS, partitioner );
      }

      tempCS->fracBits += m_CABACEstimator->getEstFracBits(); // split bits
    }
  }

  tempCS->cost = m_pcRdCost->calcRdCost( tempCS->fracBits, tempCS->dist );

  // Check Delta QP bits for splitted structure
  xCheckDQP( *tempCS, partitioner, true );

  // If the configuration being tested exceeds the maximum number of bytes for a slice / slice-segment, then
  // a proper RD evaluation cannot be performed. Therefore, termination of the
  // slice/slice-segment must be made prior to this CTU.
  // This can be achieved by forcing the decision to be that of the rpcTempCU.
  // The exception is each slice / slice-segment must have at least one CTU.
  if (bestCS->cost != MAX_DOUBLE)
  {
#if HEVC_TILES_WPP
    const TileMap& tileMap = *tempCS->picture->tileMap;
#endif
#if HEVC_TILES_WPP || HEVC_DEPENDENT_SLICES
    const uint32_t CtuAddr             = CU::getCtuAddr( *bestCS->getCU( partitioner.chType ) );
#endif
    const bool isEndOfSlice        =    slice.getSliceMode() == FIXED_NUMBER_OF_BYTES
                                      && ((slice.getSliceBits() + CS::getEstBits(*bestCS)) > slice.getSliceArgument() << 3)
#if HEVC_TILES_WPP
                                      && CtuAddr != tileMap.getCtuTsToRsAddrMap(slice.getSliceCurStartCtuTsAddr())
#endif
#if HEVC_DEPENDENT_SLICES
                                      && CtuAddr != tileMap.getCtuTsToRsAddrMap(slice.getSliceSegmentCurStartCtuTsAddr());
#else
                                      ;
#endif

#if HEVC_DEPENDENT_SLICES
    const bool isEndOfSliceSegment =    slice.getSliceSegmentMode() == FIXED_NUMBER_OF_BYTES
                                      && ((slice.getSliceSegmentBits() + CS::getEstBits(*bestCS)) > slice.getSliceSegmentArgument() << 3)
                                      && CtuAddr != tileMap.getCtuTsToRsAddrMap(slice.getSliceSegmentCurStartCtuTsAddr());
                                          // Do not need to check slice condition for slice-segment since a slice-segment is a subset of a slice.
    if (isEndOfSlice || isEndOfSliceSegment)
#else
    if(isEndOfSlice)
#endif
    {
      bestCS->cost = MAX_DOUBLE;
    }
  }


  // RD check for sub partitioned coding structure.
#if JVET_L0266_HMVP
  bool CSUpdated =
#endif
  xCheckBestMode( tempCS, bestCS, partitioner, encTestMode );

#if JVET_L0266_HMVP
  if (!slice.isIntra())
  {
    if (CSUpdated)
    {
      std::swap(tempMotCandLUTs, bestMotCandLUTs);
    }
    tempCS->slice->copyMotionLUTs(m_pSplitTempMotLUTs[wParIdx][hParIdx], tempMotCandLUTs);
  }
#endif

  tempCS->releaseIntermediateData();

  tempCS->prevQP[partitioner.chType] = oldPrevQp;
}


void EncCu::xCheckRDCostIntra( CodingStructure *&tempCS, CodingStructure *&bestCS, Partitioner &partitioner, const EncTestMode& encTestMode )
{
  double bestInterCost             = m_modeCtrl->getBestInterCost();
  double costSize2Nx2NemtFirstPass = m_modeCtrl->getEmtSize2Nx2NFirstPassCost();
  double costSizeNxNemtFirstPass   = MAX_DOUBLE;
  bool skipSecondEmtPass           = m_modeCtrl->getSkipSecondEMTPass();
  const SPS &sps                   = *tempCS->sps;
  const PPS &pps              = *tempCS->pps;
  const CodingUnit *bestCU    = bestCS->getCU( partitioner.chType );
  const int maxSizeEMT        = pps.pcv->noRQT ? EMT_INTRA_MAX_CU_WITH_QTBT : EMT_INTRA_MAX_CU;
#if HM_EMT_NSST_AS_IN_JEM
  uint8_t considerEmtSecondPass = ( sps.getSpsNext().getUseIntraEMT() && isLuma( partitioner.chType ) && partitioner.currArea().lwidth() <= maxSizeEMT && partitioner.currArea().lheight() <= maxSizeEMT ) ? 1 : 0;
#else
  uint8_t considerEmtSecondPass = ( sps.getSpsNext().getUseIntraEMT() && isLuma( partitioner.chType ) && partitioner.currArea().lwidth() <= maxSizeEMT && partitioner.currArea().lheight() <= maxSizeEMT && nsstIdx == 0 ) ? 1 : 0;
#endif

  Distortion interHad = m_modeCtrl->getInterHad();



  for( uint8_t emtCuFlag = 0; emtCuFlag <= considerEmtSecondPass; emtCuFlag++ )
  {
    //Possible early EMT tests interruptions
    //2) Second EMT pass. This "if clause" is necessary because of the NSST and PDPC "for loops".
    if( emtCuFlag && skipSecondEmtPass )
    {
      continue;
    }
    //3) if interHad is 0, only try further modes if some intra mode was already better than inter
    if( m_pcEncCfg->getUsePbIntraFast() && !tempCS->slice->isIntra() && bestCU && CU::isInter( *bestCS->getCU( partitioner.chType ) ) && interHad == 0 )
    {
      continue;
    }

    tempCS->initStructData( encTestMode.qp, encTestMode.lossless );

    CodingUnit &cu      = tempCS->addCU( CS::getArea( *tempCS, tempCS->area, partitioner.chType ), partitioner.chType );

    partitioner.setCUData( cu );
    cu.slice            = tempCS->slice;
#if HEVC_TILES_WPP
    cu.tileIdx          = tempCS->picture->tileMap->getTileIdxMap( tempCS->area.lumaPos() );
#endif
    cu.skip             = false;
    cu.partSize         = encTestMode.partSize;
    cu.predMode         = MODE_INTRA;
    cu.transQuantBypass = encTestMode.lossless;
    cu.chromaQpAdj      = cu.transQuantBypass ? 0 : m_cuChromaQpOffsetIdxPlus1;
    cu.qp               = encTestMode.qp;
  //cu.ipcm             = false;
    cu.emtFlag          = emtCuFlag;

    CU::addPUs( cu );

    tempCS->interHad    = interHad;

    if( isLuma( partitioner.chType ) )
    {
      m_pcIntraSearch->estIntraPredLumaQT( cu, partitioner );

      if (m_pcEncCfg->getUsePbIntraFast() && tempCS->dist == std::numeric_limits<Distortion>::max()
          && tempCS->interHad == 0)
      {
        interHad = 0;
        // JEM assumes only perfect reconstructions can from now on beat the inter mode
        m_modeCtrl->enforceInterHad( 0 );
        continue;
      }

      if( !CS::isDualITree( *tempCS ) )
      {
        cu.cs->picture->getRecoBuf( cu.Y() ).copyFrom( cu.cs->getRecoBuf( COMPONENT_Y ) );
      }
    }

    if( tempCS->area.chromaFormat != CHROMA_400 && ( partitioner.chType == CHANNEL_TYPE_CHROMA || !CS::isDualITree( *tempCS ) ) )
    {
      m_pcIntraSearch->estIntraPredChromaQT( cu, partitioner );
    }

    cu.rootCbf = false;

    for( uint32_t t = 0; t < getNumberValidTBlocks( *cu.cs->pcv ); t++ )
    {
      cu.rootCbf |= cu.firstTU->cbf[t] != 0;
    }

    // Get total bits for current mode: encode CU
    m_CABACEstimator->resetBits();

    if( pps.getTransquantBypassEnabledFlag() )
    {
      m_CABACEstimator->cu_transquant_bypass_flag( cu );
    }

    if( !cu.cs->slice->isIntra() 
      )
    {
      m_CABACEstimator->cu_skip_flag ( cu );
    }
    m_CABACEstimator->pred_mode      ( cu );
    m_CABACEstimator->cu_pred_data   ( cu );
    m_CABACEstimator->pcm_data       ( cu );


    // Encode Coefficients
    CUCtx cuCtx;
    cuCtx.isDQPCoded = true;
    cuCtx.isChromaQpAdjCoded = true;
    m_CABACEstimator->cu_residual( cu, partitioner, cuCtx );

    tempCS->fracBits = m_CABACEstimator->getEstFracBits();
    tempCS->cost     = m_pcRdCost->calcRdCost(tempCS->fracBits, tempCS->dist);

    xEncodeDontSplit( *tempCS, partitioner );

    xCheckDQP( *tempCS, partitioner );


    // we save the cost of the modes for the first EMT pass
    if( !emtCuFlag ) static_cast< double& >( cu.partSize == SIZE_2Nx2N ? costSize2Nx2NemtFirstPass : costSizeNxNemtFirstPass ) = tempCS->cost;

#if WCG_EXT
    DTRACE_MODE_COST( *tempCS, m_pcRdCost->getLambda( true ) );
#else
    DTRACE_MODE_COST( *tempCS, m_pcRdCost->getLambda() );
#endif
    xCheckBestMode( tempCS, bestCS, partitioner, encTestMode );


    //now we check whether the second pass of SIZE_2Nx2N and the whole Intra SIZE_NxN should be skipped or not
    if( !emtCuFlag && !tempCS->slice->isIntra() && bestCU && bestCU->predMode != MODE_INTRA && cu.partSize == SIZE_2Nx2N && m_pcEncCfg->getFastInterEMT() )
    {
      const double thEmtInterFastSkipIntra = 1.4; // Skip checking Intra if "2Nx2N using DCT2" is worse than best Inter mode
      if( costSize2Nx2NemtFirstPass > thEmtInterFastSkipIntra * bestInterCost )
      {
        skipSecondEmtPass = true;
        m_modeCtrl->setSkipSecondEMTPass( true );
        break;
      }
    }

  } //for emtCuFlag
}

void EncCu::xCheckIntraPCM(CodingStructure *&tempCS, CodingStructure *&bestCS, Partitioner &partitioner, const EncTestMode& encTestMode )
{
  tempCS->initStructData( encTestMode.qp, encTestMode.lossless );

  CodingUnit &cu      = tempCS->addCU( tempCS->area, partitioner.chType );

  partitioner.setCUData( cu );
  cu.slice            = tempCS->slice;
#if HEVC_TILES_WPP
  cu.tileIdx          = tempCS->picture->tileMap->getTileIdxMap( tempCS->area.lumaPos() );
#endif
  cu.skip             = false;
  cu.partSize         = SIZE_2Nx2N;
  cu.predMode         = MODE_INTRA;
  cu.transQuantBypass = encTestMode.lossless;
  cu.chromaQpAdj      = cu.transQuantBypass ? 0 : m_cuChromaQpOffsetIdxPlus1;
  cu.qp               = encTestMode.qp;
  cu.ipcm             = true;

  tempCS->addPU(tempCS->area, partitioner.chType);

  tempCS->addTU( tempCS->area, partitioner.chType );

  m_pcIntraSearch->IPCMSearch(*tempCS, partitioner);

  m_CABACEstimator->getCtx() = m_CurrCtx->start;

  m_CABACEstimator->resetBits();

  if( tempCS->pps->getTransquantBypassEnabledFlag() )
  {
    m_CABACEstimator->cu_transquant_bypass_flag( cu );
  }

  if( !cu.cs->slice->isIntra() 
    )
  {
    m_CABACEstimator->cu_skip_flag ( cu );
  }
  m_CABACEstimator->pred_mode      ( cu );
  m_CABACEstimator->pcm_data       ( cu );


  tempCS->fracBits = m_CABACEstimator->getEstFracBits();
  tempCS->cost     = m_pcRdCost->calcRdCost(tempCS->fracBits, tempCS->dist);

  xEncodeDontSplit( *tempCS, partitioner );

  xCheckDQP( *tempCS, partitioner );

#if WCG_EXT
  DTRACE_MODE_COST( *tempCS, m_pcRdCost->getLambda( true ) );
#else
  DTRACE_MODE_COST( *tempCS, m_pcRdCost->getLambda() );
#endif
  xCheckBestMode( tempCS, bestCS, partitioner, encTestMode );
}

void EncCu::xCheckDQP( CodingStructure& cs, Partitioner& partitioner, bool bKeepCtx )
{
  CHECK( bKeepCtx && cs.cus.size() <= 1 && partitioner.getImplicitSplit( cs ) == CU_DONT_SPLIT, "bKeepCtx should only be set in split case" );
  CHECK( !bKeepCtx && cs.cus.size() > 1, "bKeepCtx should never be set for non-split case" );

  if( !cs.pps->getUseDQP() )
  {
    return;
  }

  if( bKeepCtx && partitioner.currDepth != cs.pps->getMaxCuDQPDepth() )
  {
    return;
  }

  if( !bKeepCtx && partitioner.currDepth > cs.pps->getMaxCuDQPDepth() )
  {
    return;
  }

  CodingUnit* cuFirst = cs.getCU( partitioner.chType );

  CHECK( !cuFirst, "No CU available" );

  bool hasResidual = false;
  for( const auto &cu : cs.cus )
  {
    if( cu->rootCbf )
    {
      hasResidual = true;
      break;
    }
  }

  int predQP = CU::predictQP( *cuFirst, cs.prevQP[partitioner.chType] );

  if( hasResidual )
  {
    TempCtx ctxTemp( m_CtxCache );
    if( !bKeepCtx ) ctxTemp = SubCtx( Ctx::DeltaQP, m_CABACEstimator->getCtx() );

    m_CABACEstimator->resetBits();
    m_CABACEstimator->cu_qp_delta( *cuFirst, predQP, cuFirst->qp );

    cs.fracBits += m_CABACEstimator->getEstFracBits(); // dQP bits
    cs.cost      = m_pcRdCost->calcRdCost(cs.fracBits, cs.dist);


    if( !bKeepCtx ) m_CABACEstimator->getCtx() = SubCtx( Ctx::DeltaQP, ctxTemp );

    // NOTE: reset QPs for CUs without residuals up to first coded CU
    for( const auto &cu : cs.cus )
    {
      if( cu->rootCbf )
      {
        break;
      }
      cu->qp = predQP;
    }
  }
  else
  {
    // No residuals: reset CU QP to predicted value
    for( const auto &cu : cs.cus )
    {
      cu->qp = predQP;
    }
  }
}

void EncCu::xFillPCMBuffer( CodingUnit &cu )
{
  const ChromaFormat format        = cu.chromaFormat;
  const uint32_t numberValidComponents = getNumberValidComponents(format);

  for( auto &tu : CU::traverseTUs( cu ) )
  {
    for( uint32_t ch = 0; ch < numberValidComponents; ch++ )
    {
      const ComponentID compID = ComponentID( ch );

      const CompArea &compArea = tu.blocks[ compID ];

      const CPelBuf source      = tu.cs->getOrgBuf( compArea );
             PelBuf destination = tu.getPcmbuf( compID );

      destination.copyFrom( source );
    }
  }
}


void EncCu::xCheckRDCostMerge2Nx2N( CodingStructure *&tempCS, CodingStructure *&bestCS, Partitioner &partitioner, const EncTestMode& encTestMode )
{
  const Slice &slice = *tempCS->slice;

  CHECK( slice.getSliceType() == I_SLICE, "Merge modes not available for I-slices" );

  tempCS->initStructData( encTestMode.qp, encTestMode.lossless );

  MergeCtx mergeCtx;
  const SPS &sps = *tempCS->sps;

  if( sps.getSpsNext().getUseSubPuMvp() )
  {
    Size bufSize = g_miScaling.scale( tempCS->area.lumaSize() );
    mergeCtx.subPuMvpMiBuf    = MotionBuf( m_SubPuMiBuf,    bufSize );
  }

  {
    // first get merge candidates
    CodingUnit cu( tempCS->area );
    cu.cs       = tempCS;
    cu.partSize = SIZE_2Nx2N;
    cu.predMode = MODE_INTER;
    cu.slice    = tempCS->slice;
#if HEVC_TILES_WPP
    cu.tileIdx  = tempCS->picture->tileMap->getTileIdxMap(tempCS->area.lumaPos());
#endif

    PredictionUnit pu( tempCS->area );
    pu.cu = &cu;
    pu.cs = tempCS;

    PU::getInterMergeCandidates(pu, mergeCtx);
  }


  bool candHasNoResidual[MRG_MAX_NUM_CANDS];
  for (uint32_t ui = 0; ui < mergeCtx.numValidMergeCand; ui++)
  {
    candHasNoResidual[ui] = false;
  }

  bool                                        bestIsSkip       = false;
  unsigned                                    uiNumMrgSATDCand = mergeCtx.numValidMergeCand;
  PelUnitBuf                                  acMergeBuffer    [ MRG_MAX_NUM_CANDS ];
  static_vector<unsigned, MRG_MAX_NUM_CANDS>  RdModeList;
  bool                                        mrgTempBufSet    = false;

#if DMVR_JVET_LOW_LATENCY_K0217
  Mv                                          refinedMvdL0[MRG_MAX_NUM_CANDS];
#endif

  for( unsigned i = 0; i < MRG_MAX_NUM_CANDS; i++ )
  {
    RdModeList.push_back( i );
  }

  if( m_pcEncCfg->getUseFastMerge() )
  {
    uiNumMrgSATDCand = NUM_MRG_SATD_CAND;
    bestIsSkip       = false;

    if( auto blkCache = dynamic_cast< CacheBlkInfoCtrl* >( m_modeCtrl ) )
    {
      bestIsSkip = blkCache->isSkip( tempCS->area );
    }

    static_vector<double, MRG_MAX_NUM_CANDS> candCostList;

    // 1. Pass: get SATD-cost for selected candidates and reduce their count
    if( !bestIsSkip )
    {
      RdModeList.clear();
      mrgTempBufSet       = true;
      const double sqrtLambdaForFirstPass = m_pcRdCost->getMotionLambda( encTestMode.lossless );

      CodingUnit &cu      = tempCS->addCU( tempCS->area, partitioner.chType );

      partitioner.setCUData( cu );
      cu.slice            = tempCS->slice;
#if HEVC_TILES_WPP
      cu.tileIdx          = tempCS->picture->tileMap->getTileIdxMap( tempCS->area.lumaPos() );
#endif
      cu.skip             = false;
      cu.partSize         = SIZE_2Nx2N;
    //cu.affine
      cu.predMode         = MODE_INTER;
    //cu.LICFlag
      cu.transQuantBypass = encTestMode.lossless;
      cu.chromaQpAdj      = cu.transQuantBypass ? 0 : m_cuChromaQpOffsetIdxPlus1;
      cu.qp               = encTestMode.qp;
    //cu.emtFlag  is set below

      PredictionUnit &pu  = tempCS->addPU( cu, partitioner.chType );

      DistParam distParam;
      const bool bUseHadamard= !encTestMode.lossless;
      m_pcRdCost->setDistParam (distParam, tempCS->getOrgBuf().Y(), m_acMergeBuffer[0].Y(), sps.getBitDepth (CHANNEL_TYPE_LUMA), COMPONENT_Y, bUseHadamard);

      const UnitArea localUnitArea( tempCS->area.chromaFormat, Area( 0, 0, tempCS->area.Y().width, tempCS->area.Y().height) );
      for( uint32_t uiMergeCand = 0; uiMergeCand < mergeCtx.numValidMergeCand; uiMergeCand++ )
      {
        acMergeBuffer[uiMergeCand] = m_acMergeBuffer[uiMergeCand].getBuf( localUnitArea );

        mergeCtx.setMergeInfo( pu, uiMergeCand );

        PU::spanMotionInfo( pu, mergeCtx );

        distParam.cur = acMergeBuffer[uiMergeCand].Y();

        m_pcInterSearch->motionCompensation( pu,  acMergeBuffer[uiMergeCand] );
        
        if( mergeCtx.interDirNeighbours[uiMergeCand] == 3 && mergeCtx.mrgTypeNeighbours[uiMergeCand] == MRG_TYPE_DEFAULT_N )
        {
          mergeCtx.mvFieldNeighbours[2*uiMergeCand].mv   = pu.mv[0];
          mergeCtx.mvFieldNeighbours[2*uiMergeCand+1].mv = pu.mv[1];
#if DMVR_JVET_LOW_LATENCY_K0217
          refinedMvdL0[uiMergeCand] = pu.mvd[0];
#endif
        }

        Distortion uiSad = distParam.distFunc(distParam);
        uint32_t uiBitsCand = uiMergeCand + 1;
        if( uiMergeCand == tempCS->slice->getMaxNumMergeCand() - 1 )
        {
          uiBitsCand--;
        }
        double cost     = (double)uiSad + (double)uiBitsCand * sqrtLambdaForFirstPass;

        updateCandList( uiMergeCand, cost, RdModeList, candCostList, uiNumMrgSATDCand );
        CHECK( std::min( uiMergeCand + 1, uiNumMrgSATDCand ) != RdModeList.size(), "" );
      }
      // Try to limit number of candidates using SATD-costs
      for( uint32_t i = 1; i < uiNumMrgSATDCand; i++ )
      {
        if( candCostList[i] > MRG_FAST_RATIO * candCostList[0] )
        {
          uiNumMrgSATDCand = i;
          break;
        }
      }

      tempCS->initStructData( encTestMode.qp, encTestMode.lossless );
    }
    else
    {
      uiNumMrgSATDCand = mergeCtx.numValidMergeCand;
    }
  }

  const uint32_t iteration = encTestMode.lossless ? 1 : 2;

  // 2. Pass: check candidates using full RD test
  for( uint32_t uiNoResidualPass = 0; uiNoResidualPass < iteration; uiNoResidualPass++ )
  {
    for( uint32_t uiMrgHADIdx = 0; uiMrgHADIdx < uiNumMrgSATDCand; uiMrgHADIdx++ )
    {
      uint32_t uiMergeCand = RdModeList[uiMrgHADIdx];
      if( ( (uiNoResidualPass != 0) && candHasNoResidual[uiMergeCand] )
       || ( (uiNoResidualPass == 0) && bestIsSkip ) )
      {
        continue;
      }

      // first get merge candidates
      CodingUnit &cu      = tempCS->addCU( tempCS->area, partitioner.chType );

      partitioner.setCUData( cu );
      cu.slice            = tempCS->slice;
#if HEVC_TILES_WPP
      cu.tileIdx          = tempCS->picture->tileMap->getTileIdxMap( tempCS->area.lumaPos() );
#endif
      cu.skip             = false;
      cu.partSize         = SIZE_2Nx2N;
    //cu.affine
      cu.predMode         = MODE_INTER;
    //cu.LICFlag
      cu.transQuantBypass = encTestMode.lossless;
      cu.chromaQpAdj      = cu.transQuantBypass ? 0 : m_cuChromaQpOffsetIdxPlus1;
      cu.qp               = encTestMode.qp;
      PredictionUnit &pu  = tempCS->addPU( cu, partitioner.chType );

      mergeCtx.setMergeInfo( pu, uiMergeCand );
      PU::spanMotionInfo( pu, mergeCtx );

      if( mrgTempBufSet )
      {
#if DMVR_JVET_LOW_LATENCY_K0217
        pu.mvd[0] = refinedMvdL0[uiMergeCand];
#endif
        tempCS->getPredBuf().copyFrom( acMergeBuffer[ uiMergeCand ]);
      }
      else
      {
        m_pcInterSearch->motionCompensation( pu );
        
      }

      xEncodeInterResidual( tempCS, bestCS, partitioner, encTestMode, uiNoResidualPass
        , NULL
        , 1
        , uiNoResidualPass == 0 ? &candHasNoResidual[uiMergeCand] : NULL );

      if( m_pcEncCfg->getUseFastDecisionForMerge() && !bestIsSkip )
      {
        bestIsSkip = bestCS->getCU( partitioner.chType )->rootCbf == 0;
      }
      tempCS->initStructData( encTestMode.qp, encTestMode.lossless );
    }// end loop uiMrgHADIdx

    if( uiNoResidualPass == 0 && m_pcEncCfg->getUseEarlySkipDetection() )
    {
      const CodingUnit     &bestCU = *bestCS->getCU( partitioner.chType );
      const PredictionUnit &bestPU = *bestCS->getPU( partitioner.chType );

      if( bestCU.rootCbf == 0 )
      {
        if( bestPU.mergeFlag )
        {
          m_modeCtrl->setEarlySkipDetected();
        }
        else if( m_pcEncCfg->getMotionEstimationSearchMethod() != MESEARCH_SELECTIVE )
        {
          int absolute_MV = 0;

          for( uint32_t uiRefListIdx = 0; uiRefListIdx < 2; uiRefListIdx++ )
          {
            if( slice.getNumRefIdx( RefPicList( uiRefListIdx ) ) > 0 )
            {
              absolute_MV += bestPU.mvd[uiRefListIdx].getAbsHor() + bestPU.mvd[uiRefListIdx].getAbsVer();
            }
          }

          if( absolute_MV == 0 )
          {
            m_modeCtrl->setEarlySkipDetected();
          }
        }
      }
    }
  }
}

void EncCu::xCheckRDCostAffineMerge2Nx2N( CodingStructure *&tempCS, CodingStructure *&bestCS, Partitioner &partitioner, const EncTestMode& encTestMode )
{
  if( m_modeCtrl->getFastDeltaQp() )
  {
    return;
  }

  if ( bestCS->area.lumaSize().width < 8 || bestCS->area.lumaSize().height < 8 )
  {
    return;
  }

  MvField       affineMvField[2][3];
  unsigned char interDirNeighbours;
  int           numValidMergeCand;
  bool          hasNoResidual = false;
#if JVET_L0646_GBI
  uint8_t       gbiIdx = GBI_DEFAULT;
#endif


  tempCS->initStructData( encTestMode.qp, encTestMode.lossless );

  CodingUnit &cu      = tempCS->addCU( tempCS->area, partitioner.chType );

  partitioner.setCUData( cu );
  cu.slice            = tempCS->slice;
#if HEVC_TILES_WPP
  cu.tileIdx          = tempCS->picture->tileMap->getTileIdxMap( tempCS->area.lumaPos() );
#endif
  cu.skip             = false;
  cu.partSize         = encTestMode.partSize;
  cu.affine           = true;
  cu.predMode         = MODE_INTER;
  cu.transQuantBypass = encTestMode.lossless;
  cu.chromaQpAdj      = cu.transQuantBypass ? 0 : m_cuChromaQpOffsetIdxPlus1;
  cu.qp               = encTestMode.qp;

  CU::addPUs( cu );

  cu.firstPU->mergeFlag = true;
  cu.firstPU->mergeIdx  = 0;
#if JVET_L0646_GBI
  PU::getAffineMergeCand( *cu.firstPU, affineMvField, interDirNeighbours, gbiIdx, numValidMergeCand );
#else
  PU::getAffineMergeCand( *cu.firstPU, affineMvField, interDirNeighbours, numValidMergeCand );
#endif
  if( numValidMergeCand == -1 )
  {
    return;
  }

  cu.firstPU->interDir = interDirNeighbours;
  PU::setAllAffineMvField( *cu.firstPU, affineMvField[REF_PIC_LIST_0], REF_PIC_LIST_0 );
  PU::setAllAffineMvField( *cu.firstPU, affineMvField[REF_PIC_LIST_1], REF_PIC_LIST_1 );
#if JVET_L0646_GBI
  cu.GBiIdx = gbiIdx;
#endif

  PU::spanMotionInfo( *cu.firstPU );

  m_pcInterSearch->motionCompensation( cu );

  xEncodeInterResidual(tempCS, bestCS, partitioner, encTestMode, 0
    , NULL
    , 1
    , &hasNoResidual);

  if( ! (encTestMode.lossless || hasNoResidual) )
  {
    tempCS->initStructData( encTestMode.qp, encTestMode.lossless );
    tempCS->copyStructure( *bestCS, partitioner.chType );
    tempCS->getPredBuf().copyFrom( bestCS->getPredBuf() );

    xEncodeInterResidual(tempCS, bestCS, partitioner, encTestMode, 1
      , NULL
      , 1
      , &hasNoResidual);
  }
}
void EncCu::xCheckRDCostInter( CodingStructure *&tempCS, CodingStructure *&bestCS, Partitioner &partitioner, const EncTestMode& encTestMode )
{
  tempCS->initStructData( encTestMode.qp, encTestMode.lossless );

#if JVET_L0646_GBI
  
  m_pcInterSearch->setAffineModeSelected(false);

  if( tempCS->slice->getCheckLDC() )
  {
    m_bestGbiCost[0] = m_bestGbiCost[1] = std::numeric_limits<double>::max();
    m_bestGbiIdx[0] = m_bestGbiIdx[1] = -1;
  }

  m_pcInterSearch->resetBufferedUniMotions();
  int gbiLoopNum = (tempCS->slice->isInterB() ? GBI_NUM : 1);
  gbiLoopNum = (tempCS->sps->getSpsNext().getUseGBi() ? gbiLoopNum : 1);

  if( tempCS->area.lwidth() * tempCS->area.lheight() < GBI_SIZE_CONSTRAINT )
  {
    gbiLoopNum = 1;
  }

  double curBestCost = bestCS->cost;
  double equGBiCost = MAX_DOUBLE;

  for( int gbiLoopIdx = 0; gbiLoopIdx < gbiLoopNum; gbiLoopIdx++ )
  {
    if( m_pcEncCfg->getUseGBiFast() )
    {
      auto blkCache = dynamic_cast< CacheBlkInfoCtrl* >(m_modeCtrl);

      if( blkCache )
      {
        bool isBestInter = blkCache->getInter(bestCS->area);
        uint8_t bestGBiIdx = blkCache->getGbiIdx(bestCS->area);

        if( isBestInter && g_GbiSearchOrder[gbiLoopIdx] != GBI_DEFAULT && g_GbiSearchOrder[gbiLoopIdx] != bestGBiIdx )
        {
          continue;
        }
      }
    }
    if( !tempCS->slice->getCheckLDC() )
    {
      if( gbiLoopIdx != 0 && gbiLoopIdx != 3 && gbiLoopIdx != 4 )
      {
        continue;
      }
    }
#endif

  CodingUnit &cu      = tempCS->addCU( tempCS->area, partitioner.chType );

  partitioner.setCUData( cu );
  cu.slice            = tempCS->slice;
#if HEVC_TILES_WPP
  cu.tileIdx          = tempCS->picture->tileMap->getTileIdxMap( tempCS->area.lumaPos() );
#endif
  cu.skip             = false;
  cu.partSize         = encTestMode.partSize;
//cu.affine
  cu.predMode         = MODE_INTER;
  cu.transQuantBypass = encTestMode.lossless;
  cu.chromaQpAdj      = cu.transQuantBypass ? 0 : m_cuChromaQpOffsetIdxPlus1;
  cu.qp               = encTestMode.qp;
  CU::addPUs( cu );

#if JVET_L0646_GBI
  cu.GBiIdx = g_GbiSearchOrder[gbiLoopIdx];
  uint8_t gbiIdx = cu.GBiIdx;
  bool  testGbi = (gbiIdx != GBI_DEFAULT);
#endif

  m_pcInterSearch->predInterSearch( cu, partitioner );

  const unsigned wIdx = gp_sizeIdxInfo->idxFrom( tempCS->area.lwidth () );

#if JVET_L0646_GBI
  gbiIdx = CU::getValidGbiIdx(cu);
  if( testGbi && gbiIdx == GBI_DEFAULT ) // Enabled GBi but the search results is uni.
  {
    tempCS->initStructData(encTestMode.qp, encTestMode.lossless);
    continue;
  }
  CHECK(!(testGbi || (!testGbi && gbiIdx == GBI_DEFAULT)), " !( bTestGbi || (!bTestGbi && gbiIdx == GBI_DEFAULT ) )");

  bool isEqualUni = false;
  if( m_pcEncCfg->getUseGBiFast() )
  {
    if( cu.firstPU->interDir != 3 && testGbi == 0 )
    {
      isEqualUni = true;
    }
  }
#endif

  xEncodeInterResidual( tempCS, bestCS, partitioner, encTestMode, 0
    , m_pImvTempCS ? m_pImvTempCS[wIdx][encTestMode.partSize] : NULL
    , 1
    , 0
#if JVET_L0646_GBI
    , &equGBiCost
#endif
  );

#if JVET_L0646_GBI
  if( g_GbiSearchOrder[gbiLoopIdx] == GBI_DEFAULT )
    m_pcInterSearch->setAffineModeSelected((bestCS->cus.front()->affine && !(bestCS->cus.front()->firstPU->mergeFlag)));

  tempCS->initStructData(encTestMode.qp, encTestMode.lossless);

  double skipTH = MAX_DOUBLE;
  skipTH = (m_pcEncCfg->getUseGBiFast() ? 1.05 : MAX_DOUBLE);
  if( equGBiCost > curBestCost * skipTH )
  {
    break;
  }

  if( m_pcEncCfg->getUseGBiFast() )
  {
    if( isEqualUni == true && m_pcEncCfg->getIntraPeriod() == -1 )
    {