EncCu.cpp

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

void EncCu::xCheckModeSplit(CodingStructure *&tempCS, CodingStructure *&bestCS, Partitioner &partitioner, const EncTestMode& encTestMode
  , LutMotionCand* &tempMotCandLUTs
  , LutMotionCand* &bestMotCandLUTs
  , UnitArea  parArea
)
{
  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;

  const unsigned wParIdx = gp_sizeIdxInfo->idxFrom(parArea.lwidth());
  const unsigned hParIdx = gp_sizeIdxInfo->idxFrom(parArea.lheight());
  if (tempCS->chType == CHANNEL_TYPE_LUMA)
  tempCS->slice->copyMotionLUTs(tempMotCandLUTs, m_pSplitTempMotLUTs[wParIdx][hParIdx]);

  const PartSplit split = getPartSplit( encTestMode );

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

  tempCS->initStructData( qp, bIsLosslessMode );

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

  const TempCtx ctxStartSP( m_CtxCache, SubCtx( Ctx::SplitFlag,   m_CABACEstimator->getCtx() ) );
#if JVET_M0421_SPLIT_SIG
  const TempCtx ctxStartQt( m_CtxCache, SubCtx( Ctx::SplitQtFlag, m_CABACEstimator->getCtx() ) );
  const TempCtx ctxStartHv( m_CtxCache, SubCtx( Ctx::SplitHvFlag, m_CABACEstimator->getCtx() ) );
  const TempCtx ctxStart12( m_CtxCache, SubCtx( Ctx::Split12Flag, m_CABACEstimator->getCtx() ) );
#else
  const TempCtx ctxStartBT( m_CtxCache, SubCtx( Ctx::BTSplitFlag, m_CABACEstimator->getCtx() ) );
#endif

  m_CABACEstimator->resetBits();

#if JVET_M0421_SPLIT_SIG
  m_CABACEstimator->split_cu_mode( split, *tempCS, partitioner );
#else
  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 );
    }
  }
#endif

  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 );
#if JVET_M0421_SPLIT_SIG
  m_CABACEstimator->getCtx() = SubCtx( Ctx::SplitQtFlag, ctxStartQt );
  m_CABACEstimator->getCtx() = SubCtx( Ctx::SplitHvFlag, ctxStartHv );
  m_CABACEstimator->getCtx() = SubCtx( Ctx::Split12Flag, ctxStart12 );
#else
  m_CABACEstimator->getCtx() = SubCtx( Ctx::BTSplitFlag, ctxStartBT );
#endif

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

  partitioner.splitCurrArea( split, *tempCS );

  m_CurrCtx++;

  tempCS->getRecoBuf().fill( 0 );
  AffineMVInfo tmpMVInfo;
  bool isAffMVInfoSaved;
  m_pcInterSearch->savePrevAffMVInfo(0, tmpMVInfo, isAffMVInfoSaved);

  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 );
      LutMotionCand *tempSubMotCandLUTs = m_pTempMotLUTs[wIdx][hIdx];
      LutMotionCand *bestSubMotCandLUTs = m_pBestMotLUTs[wIdx][hIdx];
      if (tempCS->chType == CHANNEL_TYPE_LUMA)
      {
        tempCS->slice->copyMotionLUTs(tempMotCandLUTs, tempSubMotCandLUTs);
        tempCS->slice->copyMotionLUTs(tempMotCandLUTs, bestSubMotCandLUTs);
      }

      xCompressCU( tempSubCS, bestSubCS, partitioner
        , tempSubMotCandLUTs
        , bestSubMotCandLUTs
      );

      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();
        bool bestCSUpdated =
        xCheckBestMode( tempCS, bestCS, partitioner, encTestMode );

        if (tempCS->chType == CHANNEL_TYPE_LUMA)
        if (bestCSUpdated)
        {
          std::swap(tempMotCandLUTs, bestMotCandLUTs);
        }
        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 (tempCS->chType == CHANNEL_TYPE_LUMA)
      tempCS->slice->copyMotionLUTs(bestSubMotCandLUTs, tempMotCandLUTs);

      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->getUseFastLCTU() )
    {
      unsigned minDepth = 0;
      unsigned maxDepth = g_aucLog2[tempCS->sps->getCTUSize()] - g_aucLog2[tempCS->sps->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 JVET_M0421_SPLIT_SIG
      m_CABACEstimator->split_cu_mode( split, *tempCS, partitioner );
#else
      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 );
      }
#endif

      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.
  bool bestCSUpdated =
  xCheckBestMode( tempCS, bestCS, partitioner, encTestMode );

  if (isAffMVInfoSaved)
    m_pcInterSearch->addAffMVInfo(tmpMVInfo);

  if (!slice.isIntra()
    && tempCS->chType == CHANNEL_TYPE_LUMA
    )
  {
    if (bestCSUpdated)
    {
      std::swap(tempMotCandLUTs, bestMotCandLUTs);
    }
    tempCS->slice->copyMotionLUTs(m_pSplitTempMotLUTs[wParIdx][hParIdx], tempMotCandLUTs);
  }

  tempCS->releaseIntermediateData();

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


void EncCu::xCheckRDCostIntra( CodingStructure *&tempCS, CodingStructure *&bestCS, Partitioner &partitioner, const EncTestMode& encTestMode )
{
#if !JVET_M0464_UNI_MTS
  double bestInterCost             = m_modeCtrl->getBestInterCost();
  double costSize2Nx2NemtFirstPass = m_modeCtrl->getEmtSize2Nx2NFirstPassCost();
  bool skipSecondEmtPass           = m_modeCtrl->getSkipSecondEMTPass();
  const SPS &sps                   = *tempCS->sps;
#endif
  const PPS &pps      = *tempCS->pps;
#if !JVET_M0464_UNI_MTS
  const CodingUnit *bestCU    = bestCS->getCU( partitioner.chType );
  const int maxSizeEMT        = EMT_INTRA_MAX_CU_WITH_QTBT;
  uint8_t considerEmtSecondPass = ( sps.getSpsNext().getUseIntraEMT() && isLuma( partitioner.chType ) && partitioner.currArea().lwidth() <= maxSizeEMT && partitioner.currArea().lheight() <= maxSizeEMT ) ? 1 : 0;
#endif

  Distortion interHad = m_modeCtrl->getInterHad();


#if JVET_M0464_UNI_MTS
  {
#else
  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;
    }
#endif

    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.mmvdSkip = false;
    cu.predMode         = MODE_INTRA;
    cu.transQuantBypass = encTestMode.lossless;
    cu.chromaQpAdj      = cu.transQuantBypass ? 0 : m_cuChromaQpOffsetIdxPlus1;
    cu.qp               = encTestMode.qp;
  //cu.ipcm             = false;
#if !JVET_M0464_UNI_MTS
    cu.emtFlag          = emtCuFlag;
#endif

    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 );
#if JVET_M0464_UNI_MTS
        return;
#else
        continue;
#endif
      }

      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() 
      && cu.Y().valid()
      )
    {
      m_CABACEstimator->cu_skip_flag ( cu );
    }
    m_CABACEstimator->pred_mode      ( cu );
    m_CABACEstimator->extend_ref_line( cu );
    m_CABACEstimator->cu_pred_data   ( cu );
    m_CABACEstimator->pcm_data       ( cu, partitioner );

    // 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 );

#if !JVET_M0464_UNI_MTS
    // we save the cost of the modes for the first EMT pass
    if( !emtCuFlag ) static_cast< double& >( costSize2Nx2NemtFirstPass ) = tempCS->cost;
#endif

#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 );

#if !JVET_M0464_UNI_MTS
    //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 && 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;
      }
    }
#endif
  } //for emtCuFlag
}

void EncCu::xCheckIntraPCM(CodingStructure *&tempCS, CodingStructure *&bestCS, Partitioner &partitioner, const EncTestMode& encTestMode )
{
  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.mmvdSkip = false;
  cu.predMode         = MODE_INTRA;
  cu.transQuantBypass = encTestMode.lossless;
  cu.chromaQpAdj      = cu.transQuantBypass ? 0 : m_cuChromaQpOffsetIdxPlus1;
  cu.qp               = encTestMode.qp;
  cu.ipcm             = true;

  tempCS->addPU( CS::getArea( *tempCS, tempCS->area, partitioner.chType ), partitioner.chType );

  tempCS->addTU( CS::getArea( *tempCS, tempCS->area, partitioner.chType ), 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() 
    && cu.Y().valid()
    )
  {
    m_CABACEstimator->cu_skip_flag ( cu );
  }
  m_CABACEstimator->pred_mode      ( cu );
  m_CABACEstimator->pcm_data       ( cu, partitioner );


  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 (CS::isDualITree(cs) && isChroma(partitioner.chType))
  {
    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 );
  }

  setMergeBestSATDCost( MAX_DOUBLE );

  {
    // first get merge candidates
    CodingUnit cu( tempCS->area );
    cu.cs       = tempCS;
    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
      , 0
    );
    PU::restrictBiPredMergeCands(pu, mergeCtx);
    PU::getInterMMVDMergeCandidates(pu, mergeCtx);
  }
  bool candHasNoResidual[MRG_MAX_NUM_CANDS + MMVD_ADD_NUM];
  for (uint32_t ui = 0; ui < MRG_MAX_NUM_CANDS + MMVD_ADD_NUM; ui++)
  {
    candHasNoResidual[ui] = false;
  }

  bool                                        bestIsSkip = false;
  bool                                        bestIsMMVDSkip = true;
  PelUnitBuf                                  acMergeBuffer[MRG_MAX_NUM_CANDS];
  PelUnitBuf                                  acMergeRealBuffer[MMVD_MRG_MAX_RD_BUF_NUM];
  PelUnitBuf *                                acMergeTempBuffer[MMVD_MRG_MAX_RD_NUM];
  PelUnitBuf *                                singleMergeTempBuffer;
  int                                         insertPos;
  unsigned                                    uiNumMrgSATDCand = mergeCtx.numValidMergeCand + MMVD_ADD_NUM;

  static_vector<unsigned, MRG_MAX_NUM_CANDS + MMVD_ADD_NUM>  RdModeList;
  bool                                        mrgTempBufSet = false;

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

  const UnitArea localUnitArea(tempCS->area.chromaFormat, Area(0, 0, tempCS->area.Y().width, tempCS->area.Y().height));
  for (unsigned i = 0; i < MMVD_MRG_MAX_RD_BUF_NUM; i++)
  {
    acMergeRealBuffer[i] = m_acMergeBuffer[i].getBuf(localUnitArea);
    if (i < MMVD_MRG_MAX_RD_NUM)
    {
      acMergeTempBuffer[i] = acMergeRealBuffer + i;
    }
    else
    {
      singleMergeTempBuffer = acMergeRealBuffer + i;
    }
  }

  static_vector<unsigned, MRG_MAX_NUM_CANDS + MMVD_ADD_NUM>  RdModeList2; // store the Intra mode for Intrainter
  RdModeList2.clear();
  bool isIntrainterEnabled = sps.getSpsNext().getUseMHIntra();
  if (bestCS->area.lwidth() * bestCS->area.lheight() < 64 || bestCS->area.lwidth() >= MAX_CU_SIZE || bestCS->area.lheight() >= MAX_CU_SIZE)
  {
    isIntrainterEnabled = false;
  }
  bool isTestSkipMerge[MRG_MAX_NUM_CANDS]; // record if the merge candidate has tried skip mode 
  for (uint32_t idx = 0; idx < MRG_MAX_NUM_CANDS; idx++)
  {
    isTestSkipMerge[idx] = false;
  }
  if( m_pcEncCfg->getUseFastMerge() || isIntrainterEnabled)
  {
    uiNumMrgSATDCand = NUM_MRG_SATD_CAND;
    if (isIntrainterEnabled)
    {
      uiNumMrgSATDCand += 1;
    }
    bestIsSkip       = false;

    if( auto blkCache = dynamic_cast< CacheBlkInfoCtrl* >( m_modeCtrl ) )
    {
      if (slice.getSPS()->getSpsNext().getCPRMode())
      {
        ComprCUCtx cuECtx = m_modeCtrl->getComprCUCtx();
        bestIsSkip = blkCache->isSkip(tempCS->area) && cuECtx.bestCU;
      }
      else
      bestIsSkip = blkCache->isSkip( tempCS->area );
      bestIsMMVDSkip = blkCache->isMMVDSkip(tempCS->area);
    }

    if (isIntrainterEnabled) // always perform low complexity check
    {
      bestIsSkip = false;
    }

    static_vector<double, MRG_MAX_NUM_CANDS + MMVD_ADD_NUM> 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 );
      const double sqrtLambdaForFirstPassIntra = m_pcRdCost->getMotionLambda(cu.transQuantBypass) / double(1 << SCALE_BITS);

      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.mmvdSkip = false;
      cu.triangle         = false;
    //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) );
      uint32_t cprCand = 0;
      uint32_t numValidMv = mergeCtx.numValidMergeCand;
      for( uint32_t uiMergeCand = 0; uiMergeCand < mergeCtx.numValidMergeCand; uiMergeCand++ )
      {
        if ((mergeCtx.interDirNeighbours[uiMergeCand] == 1 || mergeCtx.interDirNeighbours[uiMergeCand] == 3) && tempCS->slice->getRefPic(REF_PIC_LIST_0, mergeCtx.mvFieldNeighbours[uiMergeCand << 1].refIdx)->getPOC() == tempCS->slice->getPOC())
        {
          cprCand++;
          numValidMv--;
          continue;
        }
        mergeCtx.setMergeInfo( pu, uiMergeCand );

        PU::spanMotionInfo( pu, mergeCtx );
        distParam.cur = singleMergeTempBuffer->Y();
        m_pcInterSearch->motionCompensation(pu, *singleMergeTempBuffer);
        acMergeBuffer[uiMergeCand] = m_acRealMergeBuffer[uiMergeCand].getBuf(localUnitArea);
        acMergeBuffer[uiMergeCand].copyFrom(*singleMergeTempBuffer);
        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];
        }

        Distortion uiSad = distParam.distFunc(distParam);
        uint32_t uiBitsCand = uiMergeCand + 1;
        if( uiMergeCand == tempCS->slice->getMaxNumMergeCand() - 1 )
        {
          uiBitsCand--;
        }
        uiBitsCand++; // for mmvd_flag
        double cost     = (double)uiSad + (double)uiBitsCand * sqrtLambdaForFirstPass;
        insertPos = -1;
        updateDoubleCandList(uiMergeCand, cost, RdModeList, candCostList, RdModeList2, (uint32_t)NUM_LUMA_MODE, uiNumMrgSATDCand, &insertPos);
        if (insertPos != -1)
        {
          if (insertPos == RdModeList.size() - 1)
          {
            swap(singleMergeTempBuffer, acMergeTempBuffer[insertPos]);
          }
          else
          {
            for (uint32_t i = uint32_t(RdModeList.size()) - 1; i > insertPos; i--)
            {
              swap(acMergeTempBuffer[i - 1], acMergeTempBuffer[i]);
            }
            swap(singleMergeTempBuffer, acMergeTempBuffer[insertPos]);
          }
        }
        CHECK(std::min(uiMergeCand + 1 - cprCand, uiNumMrgSATDCand) != RdModeList.size(), "");
      }
      if (numValidMv < uiNumMrgSATDCand)
        uiNumMrgSATDCand = numValidMv;
      if (numValidMv == 0)
        return;


      if (isIntrainterEnabled)
      {
        int numTestIntraMode = 4;
        // prepare for Intra bits calculation
        const TempCtx ctxStart(m_CtxCache, m_CABACEstimator->getCtx());
        const TempCtx ctxStartIntraMode(m_CtxCache, SubCtx(Ctx::MHIntraPredMode, m_CABACEstimator->getCtx()));

        // for Intrainter fast, recored the best intra mode during the first round for mrege 0
        int bestMHIntraMode = -1;
        double bestMHIntraCost = MAX_DOUBLE;

        pu.mhIntraFlag = true;

        // save the to-be-tested merge candidates
        uint32_t MHIntraMergeCand[NUM_MRG_SATD_CAND];
        for (uint32_t mergeCnt = 0; mergeCnt < std::min(NUM_MRG_SATD_CAND, (const int) uiNumMrgSATDCand); mergeCnt++)
        {
          MHIntraMergeCand[mergeCnt] = RdModeList[mergeCnt];
        }
        for (uint32_t mergeCnt = 0; mergeCnt < std::min( std::min(NUM_MRG_SATD_CAND, (const int)uiNumMrgSATDCand), 4); mergeCnt++)
        {
          uint32_t mergeCand = MHIntraMergeCand[mergeCnt];
          acMergeBuffer[mergeCand] = m_acRealMergeBuffer[mergeCand].getBuf(localUnitArea);

          // estimate merge bits
          uint32_t bitsCand = mergeCand + 1;
          if (mergeCand == pu.cs->slice->getMaxNumMergeCand() - 1)
          {
            bitsCand--;
          }

          // first round
          for (uint32_t intraCnt = 0; intraCnt < numTestIntraMode; intraCnt++)
          {
            pu.intraDir[0] = (intraCnt < 2) ? intraCnt : ((intraCnt == 2) ? HOR_IDX : VER_IDX);

            // fast 2
            if (mergeCnt > 0 && bestMHIntraMode != pu.intraDir[0])
            {
              continue;
            }
            int narrowCase = PU::getNarrowShape(pu.lwidth(), pu.lheight());
            if (narrowCase == 1 && pu.intraDir[0] == HOR_IDX)
            {
              continue;
            }
            if (narrowCase == 2 && pu.intraDir[0] == VER_IDX)
            {
              continue;
            }
            // generate intrainter Y prediction
            if (mergeCnt == 0)
            {
              bool isUseFilter = IntraPrediction::useFilteredIntraRefSamples(COMPONENT_Y, pu, true, pu);
              m_pcIntraSearch->initIntraPatternChType(*pu.cu, pu.Y(), isUseFilter);
              m_pcIntraSearch->predIntraAng(COMPONENT_Y, pu.cs->getPredBuf(pu).Y(), pu, isUseFilter);
              m_pcIntraSearch->switchBuffer(pu, COMPONENT_Y, pu.cs->getPredBuf(pu).Y(), m_pcIntraSearch->getPredictorPtr2(COMPONENT_Y, intraCnt));
            }
            pu.cs->getPredBuf(pu).copyFrom(acMergeBuffer[mergeCand]);
            m_pcIntraSearch->geneWeightedPred(COMPONENT_Y, pu.cs->getPredBuf(pu).Y(), pu, m_pcIntraSearch->getPredictorPtr2(COMPONENT_Y, intraCnt));

            // calculate cost
            distParam.cur = pu.cs->getPredBuf(pu).Y();
            Distortion sadValue = distParam.distFunc(distParam);
            m_CABACEstimator->getCtx() = SubCtx(Ctx::MHIntraPredMode, ctxStartIntraMode);
            uint64_t fracModeBits = m_pcIntraSearch->xFracModeBitsIntra(pu, pu.intraDir[0], CHANNEL_TYPE_LUMA);
            double cost = (double)sadValue + (double)(bitsCand + 1) * sqrtLambdaForFirstPass + (double)fracModeBits * sqrtLambdaForFirstPassIntra;
            insertPos = -1;
            updateDoubleCandList(mergeCand + MRG_MAX_NUM_CANDS + MMVD_ADD_NUM, cost, RdModeList, candCostList, RdModeList2, pu.intraDir[0], uiNumMrgSATDCand, &insertPos);
            if (insertPos != -1)
            {
              for (int i = int(RdModeList.size()) - 1; i > insertPos; i--)
              {
                swap(acMergeTempBuffer[i - 1], acMergeTempBuffer[i]);
              }
              swap(singleMergeTempBuffer, acMergeTempBuffer[insertPos]);
            }
            // fast 2
            if (mergeCnt == 0 && cost < bestMHIntraCost)
            {
              bestMHIntraMode = pu.intraDir[0];
              bestMHIntraCost = cost;
            }
          }
        }
        pu.mhIntraFlag = false;
        m_CABACEstimator->getCtx() = ctxStart;
      }

      cu.mmvdSkip = true;
      int tempNum = 0;
      tempNum = MMVD_ADD_NUM;
      bool allowDirection[4] = { true, true, true, true };
      for (uint32_t mergeCand = mergeCtx.numValidMergeCand; mergeCand < mergeCtx.numValidMergeCand + tempNum; mergeCand++)
      {
        const int mmvdMergeCand = mergeCand - mergeCtx.numValidMergeCand;
        int bitsBaseIdx = 0;
        int bitsRefineStep = 0;
        int bitsDirection = 2;
        int bitsCand = 0;
        int baseIdx;
        int refineStep;
        int direction;
        baseIdx = mmvdMergeCand / MMVD_MAX_REFINE_NUM;
        refineStep = (mmvdMergeCand - (baseIdx * MMVD_MAX_REFINE_NUM)) / 4;
        direction = (mmvdMergeCand - baseIdx * MMVD_MAX_REFINE_NUM - refineStep * 4) % 4;
        if (refineStep == 0)
        {
          allowDirection[direction] = true;
        }
        if (allowDirection[direction] == false)
        {
          continue;
        }
        bitsBaseIdx = baseIdx + 1;
        if (baseIdx == MMVD_BASE_MV_NUM - 1)
        {
          bitsBaseIdx--;
        }

        bitsRefineStep = refineStep + 1;
        if (refineStep == MMVD_REFINE_STEP - 1)
        {
          bitsRefineStep--;
        }

        bitsCand = bitsBaseIdx + bitsRefineStep + bitsDirection;
        bitsCand++; // for mmvd_flag

        mergeCtx.setMmvdMergeCandiInfo(pu, mmvdMergeCand);

        PU::spanMotionInfo(pu, mergeCtx);
        distParam.cur = singleMergeTempBuffer->Y();
        m_pcInterSearch->motionCompensation(pu, *singleMergeTempBuffer);

        Distortion uiSad = distParam.distFunc(distParam);


        double cost = (double)uiSad + (double)bitsCand * sqrtLambdaForFirstPass;
        allowDirection[direction] = cost >  1.3 * candCostList[0] ? 0 : 1;
        insertPos = -1;
        updateDoubleCandList(mergeCand, cost, RdModeList, candCostList, RdModeList2, (uint32_t)NUM_LUMA_MODE, uiNumMrgSATDCand, &insertPos);
        if (insertPos != -1)
        {
          for (int i = int(RdModeList.size()) - 1; i > insertPos; i--)
          {
            swap(acMergeTempBuffer[i - 1], acMergeTempBuffer[i]);
          }
          swap(singleMergeTempBuffer, acMergeTempBuffer[insertPos]);
        }
      }

      // 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;
        }
      }

      setMergeBestSATDCost( candCostList[0] );

      if (isIntrainterEnabled)
      {
        pu.mhIntraFlag = true;
        for (uint32_t mergeCnt = 0; mergeCnt < uiNumMrgSATDCand; mergeCnt++)
        {
          if (RdModeList[mergeCnt] >= (MRG_MAX_NUM_CANDS + MMVD_ADD_NUM))
          {
            pu.intraDir[0] = RdModeList2[mergeCnt];
            pu.intraDir[1] = DM_CHROMA_IDX;
            uint32_t bufIdx = (pu.intraDir[0] > 1) ? (pu.intraDir[0] == HOR_IDX ? 2 : 3) : pu.intraDir[0];
            bool isUseFilter = IntraPrediction::useFilteredIntraRefSamples(COMPONENT_Cb, pu, true, pu);
            m_pcIntraSearch->initIntraPatternChType(*pu.cu, pu.Cb(), isUseFilter);
            m_pcIntraSearch->predIntraAng(COMPONENT_Cb, pu.cs->getPredBuf(pu).Cb(), pu, isUseFilter);
            m_pcIntraSearch->switchBuffer(pu, COMPONENT_Cb, pu.cs->getPredBuf(pu).Cb(), m_pcIntraSearch->getPredictorPtr2(COMPONENT_Cb, bufIdx));
            isUseFilter = IntraPrediction::useFilteredIntraRefSamples(COMPONENT_Cr, pu, true, pu);
            m_pcIntraSearch->initIntraPatternChType(*pu.cu, pu.Cr(), isUseFilter);
            m_pcIntraSearch->predIntraAng(COMPONENT_Cr, pu.cs->getPredBuf(pu).Cr(), pu, isUseFilter);
            m_pcIntraSearch->switchBuffer(pu, COMPONENT_Cr, pu.cs->getPredBuf(pu).Cr(), m_pcIntraSearch->getPredictorPtr2(COMPONENT_Cr, bufIdx));
          }
        }
        pu.mhIntraFlag = false;
      }

      tempCS->initStructData( encTestMode.qp, encTestMode.lossless );
    }
    else
    {
      if (bestIsMMVDSkip)
      {
        uiNumMrgSATDCand = mergeCtx.numValidMergeCand + MMVD_ADD_NUM;
      }
      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(uiMergeCand < mergeCtx.numValidMergeCand)
        if ((mergeCtx.interDirNeighbours[uiMergeCand] == 1 || mergeCtx.interDirNeighbours[uiMergeCand] == 3) && tempCS->slice->getRefPic(REF_PIC_LIST_0, mergeCtx.mvFieldNeighbours[uiMergeCand << 1].refIdx)->getPOC() == tempCS->slice->getPOC())
        {
          continue;
        }

      if (uiNoResidualPass != 0 && uiMergeCand >= (MRG_MAX_NUM_CANDS + MMVD_ADD_NUM)) // intrainter does not support skip mode
      {
        uiMergeCand -= (MRG_MAX_NUM_CANDS + MMVD_ADD_NUM); // for skip, map back to normal merge candidate idx and try RDO
        if (isTestSkipMerge[uiMergeCand])
        {