EncCu.cpp

  const bool doParallel   = !m_pcEncCfg->getForceSingleSplitThread();
#if _MSC_VER && ENABLE_WPP_PARALLELISM
#pragma omp parallel for schedule(dynamic,1) num_threads(NUM_SPLIT_THREADS_IF_MSVC) if(doParallel)
#else
  omp_set_num_threads( m_pcEncCfg->getNumSplitThreads() );

#pragma omp parallel for schedule(dynamic,1) if(doParallel)
#endif
  for( int jId = 1; jId <= numJobs; jId++ )
  {
    // thread start
#if ENABLE_WPP_PARALLELISM
    picture->scheduler.setWppThreadId( wppTId );
#endif
    picture->scheduler.setSplitThreadId();
    picture->scheduler.setSplitJobId( jId );

    Partitioner* jobPartitioner = PartitionerFactory::get( *tempCS->slice );
    EncCu*       jobCuEnc       = m_pcEncLib->getCuEncoder( picture->scheduler.getSplitDataId( jId ) );
    auto*        jobBlkCache    = dynamic_cast<CacheBlkInfoCtrl*>( jobCuEnc->m_modeCtrl );

    jobPartitioner->copyState( partitioner );
    jobCuEnc      ->copyState( this, *jobPartitioner, currArea, true );

    if( jobBlkCache )
    {
      jobBlkCache->tick();
    }

    CodingStructure *&jobBest = jobCuEnc->m_pBestCS[wIdx][hIdx];
    CodingStructure *&jobTemp = jobCuEnc->m_pTempCS[wIdx][hIdx];

    jobUsed[jId] = true;

    jobCuEnc->xCompressCU( jobTemp, jobBest, *jobPartitioner );

    delete jobPartitioner;

    picture->scheduler.setSplitJobId( 0 );
    // thread stop
  }
  picture->scheduler.setSplitThreadId( 0 );

  int    bestJId  = 0;
  double bestCost = bestCS->cost;
  for( int jId = 1; jId <= numJobs; jId++ )
  {
    EncCu* jobCuEnc = m_pcEncLib->getCuEncoder( picture->scheduler.getSplitDataId( jId ) );

    if( jobUsed[jId] && jobCuEnc->m_pBestCS[wIdx][hIdx]->cost < bestCost )
    {
      bestCost = jobCuEnc->m_pBestCS[wIdx][hIdx]->cost;
      bestJId  = jId;
    }
  }

  if( bestJId > 0 )
  {
    copyState( m_pcEncLib->getCuEncoder( picture->scheduler.getSplitDataId( bestJId ) ), partitioner, currArea, false );
    m_CurrCtx->best = m_CABACEstimator->getCtx();

    tempCS = m_pTempCS[wIdx][hIdx];
    bestCS = m_pBestCS[wIdx][hIdx];
  }

  const int      bitDepthY = tempCS->sps->getBitDepth( CH_L );
  const UnitArea clipdArea = clipArea( currArea, *picture );

  CHECK( calcCheckSum( picture->getRecoBuf( clipdArea.Y() ), bitDepthY ) != calcCheckSum( bestCS->getRecoBuf( clipdArea.Y() ), bitDepthY ), "Data copied incorrectly!" );

  picture->finishParallelPart( currArea );

  if( auto *blkCache = dynamic_cast<CacheBlkInfoCtrl*>( m_modeCtrl ) )
  {
    for( int jId = 1; jId <= numJobs; jId++ )
    {
      if( !jobUsed[jId] || jId == bestJId ) continue;

      auto *jobBlkCache = dynamic_cast<CacheBlkInfoCtrl*>( m_pcEncLib->getCuEncoder( picture->scheduler.getSplitDataId( jId ) )->m_modeCtrl );
      CHECK( !jobBlkCache, "If own mode controller has blk info cache capability so should all other mode controllers!" );
      blkCache->CacheBlkInfoCtrl::copyState( *jobBlkCache, partitioner.currArea() );
    }

    blkCache->tick();
  }

}

void EncCu::copyState( EncCu* other, Partitioner& partitioner, const UnitArea& currArea, const bool isDist )
{
  const unsigned wIdx = gp_sizeIdxInfo->idxFrom( partitioner.currArea().lwidth () );
  const unsigned hIdx = gp_sizeIdxInfo->idxFrom( partitioner.currArea().lheight() );

  if( isDist )
  {
    other->m_pBestCS[wIdx][hIdx]->initSubStructure( *m_pBestCS[wIdx][hIdx], partitioner.chType, partitioner.currArea(), false );
    other->m_pTempCS[wIdx][hIdx]->initSubStructure( *m_pTempCS[wIdx][hIdx], partitioner.chType, partitioner.currArea(), false );
  }
  else
  {
          CodingStructure* dst =        m_pBestCS[wIdx][hIdx];
    const CodingStructure *src = other->m_pBestCS[wIdx][hIdx];
    bool keepResi = KEEP_PRED_AND_RESI_SIGNALS;

    dst->useSubStructure( *src, partitioner.chType, currArea, KEEP_PRED_AND_RESI_SIGNALS, true, keepResi, keepResi );
    dst->cost           =  src->cost;
    dst->dist           =  src->dist;
    dst->fracBits       =  src->fracBits;
    dst->features       =  src->features;
  }

  if( isDist )
  {
    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
  , 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;
  }

#if JVET_M0170_MRG_SHARELIST
  if (!slice.isIntra()
    && tempCS->chType == CHANNEL_TYPE_LUMA
    )
  {
    tempCS->slice->copyMotionLUTs(tempMotCandLUTs, tempCS->slice->getMotionLUTs());
  }

  int startShareThisLevel = 0;
  const uint32_t uiLPelX = tempCS->area.Y().lumaPos().x;
  const uint32_t uiTPelY = tempCS->area.Y().lumaPos().y;

  int splitRatio = 1;
  CHECK(!(split == CU_QUAD_SPLIT || split == CU_HORZ_SPLIT || split == CU_VERT_SPLIT
    || split == CU_TRIH_SPLIT || split == CU_TRIV_SPLIT), "invalid split type");
  splitRatio = (split == CU_HORZ_SPLIT || split == CU_VERT_SPLIT) ? 1 : 2;

  bool isOneChildSmall = ((tempCS->area.lwidth())*(tempCS->area.lheight()) >> splitRatio) < MRG_SHARELIST_SHARSIZE;

  if ((((tempCS->area.lwidth())*(tempCS->area.lheight())) > (MRG_SHARELIST_SHARSIZE * 1)))
  {
    m_shareState = NO_SHARE;
  }

  if (m_shareState == NO_SHARE)//init state
  {
    if (isOneChildSmall)
    {
      m_shareState = GEN_ON_SHARED_BOUND;//share start state
      startShareThisLevel = 1;
    }
  }
  if ((m_shareState == GEN_ON_SHARED_BOUND) && (!slice.isIntra()))
  {
#if JVET_M0170_MRG_SHARELIST
    tempCS->slice->copyMotionLUTs(tempCS->slice->getMotionLUTs(), tempCS->slice->m_MotionCandLuTsBkup);
    m_shareBndPosX = uiLPelX;
    m_shareBndPosY = uiTPelY;
    m_shareBndSizeW = tempCS->area.lwidth();
    m_shareBndSizeH = tempCS->area.lheight();
    m_shareState = SHARING;
#endif
  }


  m_pcInterSearch->setShareState(m_shareState);
  setShareStateDec(m_shareState);
#endif

  partitioner.splitCurrArea( split, *tempCS );

  m_CurrCtx++;

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

#if JVET_M0427_INLOOP_RESHAPER
  tempCS->getPredBuf().fill(0);
#endif
  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);
      }
#if JVET_M0170_MRG_SHARELIST
      tempSubCS->sharedBndPos.x = (m_shareState == SHARING) ? m_shareBndPosX : tempSubCS->area.Y().lumaPos().x;
      tempSubCS->sharedBndPos.y = (m_shareState == SHARING) ? m_shareBndPosY : tempSubCS->area.Y().lumaPos().y;
      tempSubCS->sharedBndSize.width = (m_shareState == SHARING) ? m_shareBndSizeW : tempSubCS->area.lwidth();
      tempSubCS->sharedBndSize.height = (m_shareState == SHARING) ? m_shareBndSizeH : tempSubCS->area.lheight();
      bestSubCS->sharedBndPos.x = (m_shareState == SHARING) ? m_shareBndPosX : tempSubCS->area.Y().lumaPos().x;
      bestSubCS->sharedBndPos.y = (m_shareState == SHARING) ? m_shareBndPosY : tempSubCS->area.Y().lumaPos().y;
      bestSubCS->sharedBndSize.width = (m_shareState == SHARING) ? m_shareBndSizeW : tempSubCS->area.lwidth();
      bestSubCS->sharedBndSize.height = (m_shareState == SHARING) ? m_shareBndSizeH : tempSubCS->area.lheight();
#endif
      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();

#if JVET_M0170_MRG_SHARELIST 
  if (startShareThisLevel == 1)
  {
    m_shareState = NO_SHARE;
    m_pcInterSearch->setShareState(m_shareState);
    setShareStateDec(m_shareState);
  }
#endif

  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

#if JVET_M0102_INTRA_SUBPARTITIONS
  bool   useIntraSubPartitions   = false;
  double maxCostAllowedForChroma = MAX_DOUBLE;
#if JVET_M0464_UNI_MTS
  const  CodingUnit *bestCU      = bestCS->getCU( partitioner.chType );
#endif
#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
#if JVET_M0102_INTRA_SUBPARTITIONS 
    cu.ispMode          = NOT_INTRA_SUBPARTITIONS;
#endif

    CU::addPUs( cu );

    tempCS->interHad    = interHad;

    if( isLuma( partitioner.chType ) )
    {
#if JVET_M0102_INTRA_SUBPARTITIONS
      //the Intra SubPartitions mode uses the value of the best cost so far (luma if it is the fast version) to avoid test non-necessary lines 
      const double bestCostSoFar = CS::isDualITree( *tempCS ) ? m_modeCtrl->getBestCostWithoutSplitFlags() : bestCU && bestCU->predMode == MODE_INTRA ? bestCS->lumaCost : bestCS->cost;
      m_pcIntraSearch->estIntraPredLumaQT( cu, partitioner, bestCostSoFar );

      useIntraSubPartitions = cu.ispMode != NOT_INTRA_SUBPARTITIONS;
      if( !CS::isDualITree( *tempCS ) )
      {
        tempCS->lumaCost = m_pcRdCost->calcRdCost( tempCS->fracBits, tempCS->dist );
        if( useIntraSubPartitions )
        {
          //the difference between the best cost so far and the current luma cost is stored to avoid testing the Cr component if the cost of luma + Cb is larger than the best cost
          maxCostAllowedForChroma = bestCS->cost < MAX_DOUBLE ? bestCS->cost - tempCS->lumaCost : MAX_DOUBLE;
        }
      }
#else
      m_pcIntraSearch->estIntraPredLumaQT( cu, partitioner );
#endif

      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 JVET_M0427_INLOOP_RESHAPER
        cu.cs->picture->getPredBuf(cu.Y()).copyFrom(cu.cs->getPredBuf(COMPONENT_Y));
#endif
      }
    }

    if( tempCS->area.chromaFormat != CHROMA_400 && ( partitioner.chType == CHANNEL_TYPE_CHROMA || !CS::isDualITree( *tempCS ) ) )
    {
#if JVET_M0102_INTRA_SUBPARTITIONS
      TUIntraSubPartitioner subTuPartitioner( partitioner );
      m_pcIntraSearch->estIntraPredChromaQT( cu, ( !useIntraSubPartitions || ( CS::isDualITree( *cu.cs ) && !isLuma( CHANNEL_TYPE_CHROMA ) ) ) ? partitioner : subTuPartitioner, maxCostAllowedForChroma );
      if( useIntraSubPartitions && !cu.ispMode )
      {
        //At this point the temp cost is larger than the best cost. Therefore, we can already skip the remaining calculations
#if JVET_M0464_UNI_MTS
        return;
#else
        continue;
#endif
      }
#else
      m_pcIntraSearch->estIntraPredChromaQT( cu, partitioner );
#endif
    }

    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 );
#if JVET_M0102_INTRA_SUBPARTITIONS
    m_CABACEstimator->isp_mode       ( cu );
#endif
    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);

#if JVET_M0102_INTRA_SUBPARTITIONS
#if !JVET_M0464_UNI_MTS
    double bestIspCost = cu.ispMode ? CS::isDualITree(*tempCS) ? tempCS->cost : tempCS->lumaCost : MAX_DOUBLE;
#endif
    const double tmpCostWithoutSplitFlags = tempCS->cost;
#endif
    xEncodeDontSplit( *tempCS, partitioner );

    xCheckDQP( *tempCS, partitioner );

#if JVET_M0102_INTRA_SUBPARTITIONS
    if( tempCS->cost < bestCS->cost )
    {
      m_modeCtrl->setBestCostWithoutSplitFlags( tmpCostWithoutSplitFlags );
    }
#endif
#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
#if JVET_M0102_INTRA_SUBPARTITIONS
    //we decide to skip the second emt pass or not according to the ISP results
    if (considerEmtSecondPass && cu.ispMode && !emtCuFlag && tempCS->slice->isIntra())
    {
      double bestCostDct2NoIsp = m_modeCtrl->getEmtFirstPassNoIspCost();
      CHECKD(bestCostDct2NoIsp <= bestIspCost, "wrong cost!");
      double nSamples = (double)(cu.lwidth() << g_aucLog2[cu.lheight()]);
      double threshold = 1 + 1.4 / sqrt(nSamples);
      if (bestCostDct2NoIsp > bestIspCost*threshold)
      {
        skipSecondEmtPass = true;
        m_modeCtrl->setSkipSecondEMTPass(true);
        break;
      }
    }
#endif
    //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 );
    }
  }
}
#if JVET_M0253_HASH_ME
void EncCu::xCheckRDCostHashInter( CodingStructure *&tempCS, CodingStructure *&bestCS, Partitioner &partitioner, const EncTestMode& encTestMode )
{
  bool isPerfectMatch = false;

  tempCS->initStructData(encTestMode.qp, encTestMode.lossless);
  m_pcInterSearch->resetBufferedUniMotions();
  m_pcInterSearch->setAffineModeSelected(false);
  CodingUnit &cu = tempCS->addCU(tempCS->area, partitioner.chType);

  partitioner.setCUData(cu);
  cu.slice = tempCS->slice;
  cu.skip = false;
  cu.predMode = MODE_INTER;
  cu.transQuantBypass = encTestMode.lossless;
  cu.chromaQpAdj = cu.transQuantBypass ? 0 : m_cuChromaQpOffsetIdxPlus1;
  cu.qp = encTestMode.qp;
  cu.ibc = false;
  CU::addPUs(cu);
  cu.mmvdSkip = false;
  cu.firstPU->mmvdMergeFlag = false;

  if (m_pcInterSearch->predInterHashSearch(cu, partitioner, isPerfectMatch))
  {
    const unsigned wIdx = gp_sizeIdxInfo->idxFrom(tempCS->area.lwidth());
    double equGBiCost = MAX_DOUBLE;

#if JVET_M0464_UNI_MTS
    xEncodeInterResidual(tempCS, bestCS, partitioner, encTestMode, 0
      , m_pImvTempCS ? m_pImvTempCS[wIdx] : NULL
      , 0
      , &equGBiCost
#else
    xEncodeInterResidual(tempCS, bestCS, partitioner, encTestMode, 0
      , m_pImvTempCS ? m_pImvTempCS[wIdx] : NULL
      , 1
      , 0
      , &equGBiCost
#endif
    );
  }
  tempCS->initStructData(encTestMode.qp, encTestMode.lossless);

  if (cu.lwidth() != 64)
  {
    isPerfectMatch = false;
  }
  m_modeCtrl->setIsHashPerfectMatch(isPerfectMatch);
}
#endif

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

#if JVET_M0147_DMVR
  Mv   refinedMvdL0[MAX_NUM_PARTS_IN_CTU][MRG_MAX_NUM_CANDS];
#endif
  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;
#if JVET_M0170_MRG_SHARELIST
    pu.shareParentPos = tempCS->sharedBndPos;
    pu.shareParentSize = tempCS->sharedBndSize;
#endif
    PU::getInterMergeCandidates(pu, mergeCtx
      , 0
    );
#if !JVET_M0068_M0171_MMVD_CLEANUP
    PU::restrictBiPredMergeCands(pu, mergeCtx);
#endif
    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().getIBCMode())
      {
        ComprCUCtx cuECtx = m_modeCtrl->getComprCUCtx();
        bestIsSkip = blkCache->isSkip(tempCS->area) && cuECtx.bestCU;