IntraSearch.cpp

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/** \file     EncSearch.cpp
 *  \brief    encoder intra search class
 */

#include "IntraSearch.h"

#include "EncModeCtrl.h"

#include "CommonLib/CommonDef.h"
#include "CommonLib/Rom.h"
#include "CommonLib/Picture.h"
#include "CommonLib/UnitTools.h"

#include "CommonLib/dtrace_next.h"
#include "CommonLib/dtrace_buffer.h"

#include <math.h>
#include <limits>

 //! \ingroup EncoderLib
 //! \{

IntraSearch::IntraSearch()
  : m_pSplitCS      (nullptr)
  , m_pFullCS       (nullptr)
  , m_pBestCS       (nullptr)
  , m_pcEncCfg      (nullptr)
  , m_pcTrQuant     (nullptr)
  , m_pcRdCost      (nullptr)
  , m_CABACEstimator(nullptr)
  , m_CtxCache      (nullptr)
  , m_isInitialized (false)
{
  for( uint32_t ch = 0; ch < MAX_NUM_TBLOCKS; ch++ )
  {
    m_pSharedPredTransformSkip[ch] = nullptr;
  }
}


void IntraSearch::destroy()
{
  CHECK( !m_isInitialized, "Not initialized" );

  if( m_pcEncCfg )
  {
    bool BTnoRQT = m_pcEncCfg->getQTBT();


    const uint32_t uiNumLayersToAllocateSplit = BTnoRQT ? 1 : m_pcEncCfg->getQuadtreeTULog2MaxSize() - m_pcEncCfg->getQuadtreeTULog2MinSize() + 1;
    const uint32_t uiNumLayersToAllocateFull  = BTnoRQT ? 1 : m_pcEncCfg->getQuadtreeTULog2MaxSize() - m_pcEncCfg->getQuadtreeTULog2MinSize() + 1;
    const int uiNumSaveLayersToAllocate = 2;

    for( uint32_t layer = 0; layer < uiNumSaveLayersToAllocate; layer++ )
    {
      m_pSaveCS[layer]->destroy();
      delete m_pSaveCS[layer];
    }

    uint32_t numWidths  = gp_sizeIdxInfo->numWidths();
    uint32_t numHeights = gp_sizeIdxInfo->numHeights();

    for( uint32_t width = 0; width < numWidths; width++ )
    {
      for( uint32_t height = 0; height < numHeights; height++ )
      {
        if( ( BTnoRQT || width == height ) && gp_sizeIdxInfo->isCuSize( gp_sizeIdxInfo->sizeFrom( width ) ) && gp_sizeIdxInfo->isCuSize( gp_sizeIdxInfo->sizeFrom( height ) ) )
        {
          for( uint32_t layer = 0; layer < uiNumLayersToAllocateSplit; layer++ )
          {
            m_pSplitCS[width][height][layer]->destroy();

            delete m_pSplitCS[width][height][layer];
          }

          for( uint32_t layer = 0; layer < uiNumLayersToAllocateFull; layer++ )
          {
            m_pFullCS[width][height][layer]->destroy();

            delete m_pFullCS[width][height][layer];
          }

          delete[] m_pSplitCS[width][height];
          delete[] m_pFullCS [width][height];

          m_pBestCS[width][height]->destroy();
          m_pTempCS[width][height]->destroy();

          delete m_pTempCS[width][height];
          delete m_pBestCS[width][height];
        }
      }

      delete[] m_pSplitCS[width];
      delete[] m_pFullCS [width];

      delete[] m_pTempCS[width];
      delete[] m_pBestCS[width];
    }

    delete[] m_pSplitCS;
    delete[] m_pFullCS;

    delete[] m_pBestCS;
    delete[] m_pTempCS;

    delete[] m_pSaveCS;
  }

  m_pSplitCS = m_pFullCS = nullptr;

  m_pBestCS = m_pTempCS = nullptr;

  m_pSaveCS = nullptr;

  for( uint32_t ch = 0; ch < MAX_NUM_TBLOCKS; ch++ )
  {
    delete[] m_pSharedPredTransformSkip[ch];
    m_pSharedPredTransformSkip[ch] = nullptr;
  }

  m_isInitialized = false;
}

IntraSearch::~IntraSearch()
{
  if( m_isInitialized )
  {
    destroy();
  }
}

void IntraSearch::init( EncCfg*        pcEncCfg,
                        TrQuant*       pcTrQuant,
                        RdCost*        pcRdCost,
                        CABACWriter*   CABACEstimator,
                        CtxCache*      ctxCache,
                        const uint32_t     maxCUWidth,
                        const uint32_t     maxCUHeight,
                        const uint32_t     maxTotalCUDepth
)
{
  CHECK(m_isInitialized, "Already initialized");
  m_pcEncCfg                     = pcEncCfg;
  m_pcTrQuant                    = pcTrQuant;
  m_pcRdCost                     = pcRdCost;
  m_CABACEstimator               = CABACEstimator;
  m_CtxCache                     = ctxCache;

  const ChromaFormat cform = pcEncCfg->getChromaFormatIdc();

  IntraPrediction::init( cform, pcEncCfg->getBitDepth( CHANNEL_TYPE_LUMA ) );

  for( uint32_t ch = 0; ch < MAX_NUM_TBLOCKS; ch++ )
  {
    m_pSharedPredTransformSkip[ch] = new Pel[MAX_CU_SIZE * MAX_CU_SIZE];
  }

  uint32_t numWidths  = gp_sizeIdxInfo->numWidths();
  uint32_t numHeights = gp_sizeIdxInfo->numHeights();

  bool BTnoRQT = m_pcEncCfg->getQTBT();

  const uint32_t uiNumLayersToAllocateSplit = BTnoRQT ? 1 : pcEncCfg->getQuadtreeTULog2MaxSize() - pcEncCfg->getQuadtreeTULog2MinSize() + 1;
  const uint32_t uiNumLayersToAllocateFull  = BTnoRQT ? 1 : pcEncCfg->getQuadtreeTULog2MaxSize() - pcEncCfg->getQuadtreeTULog2MinSize() + 1;

  m_pBestCS = new CodingStructure**[numWidths];
  m_pTempCS = new CodingStructure**[numWidths];

  m_pFullCS  = new CodingStructure***[numWidths];
  m_pSplitCS = new CodingStructure***[numWidths];

  for( uint32_t width = 0; width < numWidths; width++ )
  {
    m_pBestCS[width] = new CodingStructure*[numHeights];
    m_pTempCS[width] = new CodingStructure*[numHeights];

    m_pFullCS [width] = new CodingStructure**[numHeights];
    m_pSplitCS[width] = new CodingStructure**[numHeights];

    for( uint32_t height = 0; height < numHeights; height++ )
    {
      if( ( BTnoRQT || width == height ) && gp_sizeIdxInfo->isCuSize( gp_sizeIdxInfo->sizeFrom( width ) ) && gp_sizeIdxInfo->isCuSize( gp_sizeIdxInfo->sizeFrom( height ) ) )
      {
        m_pBestCS[width][height] = new CodingStructure( m_unitCache.cuCache, m_unitCache.puCache, m_unitCache.tuCache );
        m_pTempCS[width][height] = new CodingStructure( m_unitCache.cuCache, m_unitCache.puCache, m_unitCache.tuCache );

        m_pBestCS[width][height]->create( m_pcEncCfg->getChromaFormatIdc(), Area( 0, 0, gp_sizeIdxInfo->sizeFrom( width ), gp_sizeIdxInfo->sizeFrom( height ) ), false );
        m_pTempCS[width][height]->create( m_pcEncCfg->getChromaFormatIdc(), Area( 0, 0, gp_sizeIdxInfo->sizeFrom( width ), gp_sizeIdxInfo->sizeFrom( height ) ), false );
        m_pFullCS [width][height] = new CodingStructure*[uiNumLayersToAllocateFull];
        m_pSplitCS[width][height] = new CodingStructure*[uiNumLayersToAllocateSplit];

        for( uint32_t layer = 0; layer < uiNumLayersToAllocateFull; layer++ )
        {
          m_pFullCS [width][height][layer] = new CodingStructure( m_unitCache.cuCache, m_unitCache.puCache, m_unitCache.tuCache );

          m_pFullCS [width][height][layer]->create( m_pcEncCfg->getChromaFormatIdc(), Area( 0, 0, gp_sizeIdxInfo->sizeFrom( width ), gp_sizeIdxInfo->sizeFrom( height ) ), false );
        }

        for( uint32_t layer = 0; layer < uiNumLayersToAllocateSplit; layer++ )
        {
          m_pSplitCS[width][height][layer] = new CodingStructure( m_unitCache.cuCache, m_unitCache.puCache, m_unitCache.tuCache );

          m_pSplitCS[width][height][layer]->create( m_pcEncCfg->getChromaFormatIdc(), Area( 0, 0, gp_sizeIdxInfo->sizeFrom( width ), gp_sizeIdxInfo->sizeFrom( height ) ), false );
        }
      }
      else
      {
        m_pBestCS[width][height] = nullptr;
        m_pTempCS[width][height] = nullptr;

        m_pFullCS [width][height] = nullptr;
        m_pSplitCS[width][height] = nullptr;
      }
    }
  }

  const int uiNumSaveLayersToAllocate = 2;

  m_pSaveCS = new CodingStructure*[uiNumSaveLayersToAllocate];

  for( uint32_t depth = 0; depth < uiNumSaveLayersToAllocate; depth++ )
  {
    m_pSaveCS[depth] = new CodingStructure( m_unitCache.cuCache, m_unitCache.puCache, m_unitCache.tuCache );
    m_pSaveCS[depth]->create( UnitArea( cform, Area( 0, 0, maxCUWidth, maxCUHeight ) ), false );
  }

  m_isInitialized = true;
}


//////////////////////////////////////////////////////////////////////////
// INTRA PREDICTION
//////////////////////////////////////////////////////////////////////////

void IntraSearch::estIntraPredLumaQT( CodingUnit &cu, Partitioner &partitioner )
{
  CodingStructure       &cs            = *cu.cs;
  const SPS             &sps           = *cs.sps;
  const uint32_t             uiWidthBit    = cs.pcv->rectCUs ? g_aucLog2[partitioner.currArea().lwidth() ] : CU::getIntraSizeIdx(cu);
  const uint32_t             uiHeightBit   =                   g_aucLog2[partitioner.currArea().lheight()];

  // Lambda calculation at equivalent Qp of 4 is recommended because at that Qp, the quantization divisor is 1.
  const double sqrtLambdaForFirstPass = m_pcRdCost->getMotionLambda(cu.transQuantBypass) / double(1 << SCALE_BITS);


  //===== loop over partitions =====

  const TempCtx ctxStart          ( m_CtxCache, m_CABACEstimator->getCtx() );
  const TempCtx ctxStartIntraMode ( m_CtxCache, SubCtx( Ctx::IPredMode[CHANNEL_TYPE_LUMA],        m_CABACEstimator->getCtx() ) );

  CHECK( !cu.firstPU, "CU has no PUs" );
  const bool keepResi   = cs.pps->getPpsRangeExtension().getCrossComponentPredictionEnabledFlag() || KEEP_PRED_AND_RESI_SIGNALS;


  uint32_t extraModes = 0; // add two extra modes, which would be used after uiMode <= DC_IDX is removed for cu.nsstIdx == 3


  const int width   = partitioner.currArea().lwidth();
  const int height  = partitioner.currArea().lheight();

  // Marking EMT usage for faster EMT
  // 0: EMT is either not applicable for current CU (cuWidth > EMT_INTRA_MAX_CU or cuHeight > EMT_INTRA_MAX_CU), not active in the config file or the fast decision algorithm is not used in this case
  // 1: EMT fast algorithm can be applied for the current CU, and the DCT2 is being checked
  // 2: EMT is being checked for current CU. Stored results of DCT2 can be utilized for speedup
  uint8_t emtUsageFlag = 0;
  const int maxSizeEMT = cs.pcv->noRQT ? EMT_INTRA_MAX_CU_WITH_QTBT : EMT_INTRA_MAX_CU;
  if( width <= maxSizeEMT && height <= maxSizeEMT && sps.getSpsNext().getUseIntraEMT() )
  {
    emtUsageFlag = cu.emtFlag == 1 ? 2 : 1;
  }

  bool isAllIntra = m_pcEncCfg->getIntraPeriod() == 1;

  if( cs.pcv->rectCUs )
  {
    if( width * height < 64 && !isAllIntra )
    {
      emtUsageFlag = 0; //this forces the recalculation of the candidates list. Why is this necessary? (to be checked)
    }
  }

  static_vector<uint32_t,   FAST_UDI_MAX_RDMODE_NUM> uiHadModeList;
  static_vector<double, FAST_UDI_MAX_RDMODE_NUM> CandCostList;
  static_vector<double, FAST_UDI_MAX_RDMODE_NUM> CandHadList;

#if JVET_L0283_MULTI_REF_LINE
  static_vector<int, FAST_UDI_MAX_RDMODE_NUM> extendRefList;
  static_vector<int, FAST_UDI_MAX_RDMODE_NUM>* nullList = NULL;
#endif

  auto &pu = *cu.firstPU;
  int puIndex = 0;
  {
    CandHadList.clear();
    CandCostList.clear();
    uiHadModeList.clear();
#if JVET_L0283_MULTI_REF_LINE
    extendRefList.clear();
#endif

    CHECK(pu.cu != &cu, "PU is not contained in the CU");

    //===== determine set of modes to be tested (using prediction signal only) =====
    int numModesAvailable = NUM_LUMA_MODE; // total number of Intra modes
    static_vector< uint32_t, FAST_UDI_MAX_RDMODE_NUM > uiRdModeList;

    int numModesForFullRD = 3;
    if( cs.pcv->rectCUs )
    {
      numModesForFullRD = g_aucIntraModeNumFast_UseMPM_2D[uiWidthBit - MIN_CU_LOG2][uiHeightBit - MIN_CU_LOG2];
    }
    else
    {
      numModesForFullRD = m_pcEncCfg->getFastUDIUseMPMEnabled() ? g_aucIntraModeNumFast_UseMPM[uiWidthBit] : g_aucIntraModeNumFast_NotUseMPM[uiWidthBit];
      numModesForFullRD -= 1;
    }

#if INTRA_FULL_SEARCH
    numModesForFullRD = numModesAvailable;
#endif


    if( emtUsageFlag != 2 )
    {
      // this should always be true
      CHECK( !pu.Y().valid(), "PU is not valid" );
#if JVET_L0283_MULTI_REF_LINE
      bool isFirstLineOfCtu = (((pu.block(COMPONENT_Y).y)&((pu.cs->sps)->getMaxCUWidth() - 1)) == 0);
      int numOfPassesExtendRef = (isFirstLineOfCtu ? 1 : MRL_NUM_REF_LINES);
      pu.multiRefIdx = 0;
#endif

      //===== init pattern for luma prediction =====
      initIntraPatternChType( cu, pu.Y(), IntraPrediction::useFilteredIntraRefSamples( COMPONENT_Y, pu, false, pu ) );
      if( numModesForFullRD != numModesAvailable )
      {
        CHECK( numModesForFullRD >= numModesAvailable, "Too many modes for full RD search" );

        const CompArea &area = pu.Y();

        PelBuf piOrg         = cs.getOrgBuf(area);
        PelBuf piPred        = cs.getPredBuf(area);

        DistParam distParam;

        const bool bUseHadamard = cu.transQuantBypass == 0;

        m_pcRdCost->setDistParam(distParam, piOrg, piPred, sps.getBitDepth(CHANNEL_TYPE_LUMA), COMPONENT_Y, bUseHadamard);

        distParam.applyWeight = false;

        bool bSatdChecked[NUM_INTRA_MODE];
        memset( bSatdChecked, 0, sizeof( bSatdChecked ) );

        {
          for( int modeIdx = 0; modeIdx < numModesAvailable; modeIdx++ )
          {
            uint32_t       uiMode = modeIdx;
            Distortion uiSad  = 0;

            // Skip checking extended Angular modes in the first round of SATD
            if( uiMode > DC_IDX && ( uiMode & 1 ) )
            {
              continue;
            }

            bSatdChecked[uiMode] = true;

            pu.intraDir[0] = modeIdx;

            if( useDPCMForFirstPassIntraEstimation( pu, uiMode ) )
            {
              encPredIntraDPCM( COMPONENT_Y, piOrg, piPred, uiMode );
            }
            else
            {
              predIntraAng( COMPONENT_Y, piPred, pu, IntraPrediction::useFilteredIntraRefSamples( COMPONENT_Y, pu, true, pu ) );
            }
            // use Hadamard transform here
            uiSad += distParam.distFunc(distParam);

            // NB xFracModeBitsIntra will not affect the mode for chroma that may have already been pre-estimated.
            m_CABACEstimator->getCtx() = SubCtx( Ctx::IPredMode[CHANNEL_TYPE_LUMA], ctxStartIntraMode );

            uint64_t fracModeBits = xFracModeBitsIntra(pu, uiMode, CHANNEL_TYPE_LUMA);

            double cost = ( double ) uiSad + ( double ) fracModeBits * sqrtLambdaForFirstPass;

            DTRACE( g_trace_ctx, D_INTRA_COST, "IntraHAD: %u, %llu, %f (%d)\n", uiSad, fracModeBits, cost, uiMode );

            updateCandList( uiMode, cost,  uiRdModeList, CandCostList
#if JVET_L0283_MULTI_REF_LINE
              , extendRefList, 0
#endif              
              , numModesForFullRD + extraModes );
            updateCandList(uiMode, (double) uiSad, uiHadModeList, CandHadList
#if JVET_L0283_MULTI_REF_LINE
              , *nullList, -1
#endif              
              , 3 + extraModes);
          }
        } // NSSTFlag

        // forget the extra modes
        uiRdModeList.resize( numModesForFullRD );
#if JVET_L0283_MULTI_REF_LINE
        CandCostList.resize(numModesForFullRD);
        extendRefList.resize(numModesForFullRD);
#endif
        static_vector<unsigned, FAST_UDI_MAX_RDMODE_NUM> parentCandList(FAST_UDI_MAX_RDMODE_NUM);
        std::copy_n(uiRdModeList.begin(), numModesForFullRD, parentCandList.begin());

        // Second round of SATD for extended Angular modes
        for (int modeIdx = 0; modeIdx < numModesForFullRD; modeIdx++)
        {
          unsigned parentMode = parentCandList[modeIdx];
          if (parentMode > (DC_IDX + 1) && parentMode < (NUM_LUMA_MODE - 1))
          {
            for (int subModeIdx = -1; subModeIdx <= 1; subModeIdx += 2)
            {
              unsigned mode = parentMode + subModeIdx;


              if (!bSatdChecked[mode])
              {
                pu.intraDir[0] = mode;

                if (useDPCMForFirstPassIntraEstimation(pu, mode))
                {
                  encPredIntraDPCM(COMPONENT_Y, piOrg, piPred, mode);
                }
                else
                {
                  predIntraAng(COMPONENT_Y, piPred, pu,
                               IntraPrediction::useFilteredIntraRefSamples(COMPONENT_Y, pu, true, pu));
                }
                // use Hadamard transform here
                Distortion sad = distParam.distFunc(distParam);

                // NB xFracModeBitsIntra will not affect the mode for chroma that may have already been pre-estimated.
                m_CABACEstimator->getCtx() = SubCtx(Ctx::IPredMode[CHANNEL_TYPE_LUMA], ctxStartIntraMode);

                uint64_t fracModeBits = xFracModeBitsIntra(pu, mode, CHANNEL_TYPE_LUMA);

                double cost = (double) sad + (double) fracModeBits * sqrtLambdaForFirstPass;

                updateCandList(mode, cost, uiRdModeList, CandCostList
#if JVET_L0283_MULTI_REF_LINE
                  , extendRefList, 0
#endif
                  , numModesForFullRD);
                updateCandList(mode, (double)sad, uiHadModeList, CandHadList
#if JVET_L0283_MULTI_REF_LINE
                  , *nullList, -1
#endif                 
                  , 3);

                bSatdChecked[mode] = true;
              }
            }
          }
        }
#if JVET_L0283_MULTI_REF_LINE
        pu.multiRefIdx = 1;
        const int  numMPMs = NUM_MOST_PROBABLE_MODES;
        unsigned  multiRefMPM [numMPMs];
        PU::getIntraMPMs(pu, multiRefMPM);
        for (int mRefNum = 1; mRefNum < numOfPassesExtendRef; mRefNum++)
        {
          int multiRefIdx = MULTI_REF_LINE_IDX[mRefNum];

          pu.multiRefIdx = multiRefIdx;
          {
            initIntraPatternChType(cu, pu.Y(), IntraPrediction::useFilteredIntraRefSamples(COMPONENT_Y, pu, false, pu));
          }
          for (int x = 0; x < numMPMs; x++)
          {
            uint32_t mode = multiRefMPM[x];
            {
              pu.intraDir[0] = mode;

              if (useDPCMForFirstPassIntraEstimation(pu, mode))
              {
                encPredIntraDPCM(COMPONENT_Y, piOrg, piPred, mode);
              }
              else
              {
                predIntraAng(COMPONENT_Y, piPred, pu, IntraPrediction::useFilteredIntraRefSamples(COMPONENT_Y, pu, true, pu));
              }

              // use Hadamard transform here
              Distortion sad = distParam.distFunc(distParam);

              // NB xFracModeBitsIntra will not affect the mode for chroma that may have already been pre-estimated.
              m_CABACEstimator->getCtx() = SubCtx(Ctx::IPredMode[CHANNEL_TYPE_LUMA], ctxStartIntraMode);

              uint64_t fracModeBits = xFracModeBitsIntra(pu, mode, CHANNEL_TYPE_LUMA);

              double cost = (double)sad + (double)fracModeBits * sqrtLambdaForFirstPass;
              updateCandList(mode, cost, uiRdModeList, CandCostList, extendRefList, multiRefIdx, numModesForFullRD);
            }
          }
        }
        CandCostList.resize(numModesForFullRD);
        extendRefList.resize(numModesForFullRD);
#endif
        if( m_pcEncCfg->getFastUDIUseMPMEnabled() )
        {
          const int numMPMs = NUM_MOST_PROBABLE_MODES;
          unsigned  uiPreds[numMPMs];

#if JVET_L0283_MULTI_REF_LINE
          pu.multiRefIdx = 0;
#endif

          const int numCand = PU::getIntraMPMs( pu, uiPreds );

          for( int j = 0; j < numCand; j++ )
          {
            bool mostProbableModeIncluded = false;
            int  mostProbableMode         = uiPreds[j];


            for( int i = 0; i < numModesForFullRD; i++ )
            {
#if JVET_L0283_MULTI_REF_LINE
              mostProbableModeIncluded |= (mostProbableMode == uiRdModeList[i] && extendRefList[i] == 0);
#else
              mostProbableModeIncluded |= ( mostProbableMode == uiRdModeList[i] );
#endif
            }
            if( !mostProbableModeIncluded )
            {
#if JVET_L0283_MULTI_REF_LINE
              extendRefList.push_back(0);
#endif
              numModesForFullRD++;
              uiRdModeList.push_back( mostProbableMode );
            }
          }
        }
      }
      else
      {
        for( int i = 0; i < numModesForFullRD; i++ )
        {
          uiRdModeList.push_back( i );
        }
      }
      if( emtUsageFlag == 1 )
      {
        // Store the modes to be checked with RD
        m_savedNumRdModes[puIndex] = numModesForFullRD;
        std::copy_n( uiRdModeList.begin(), numModesForFullRD, m_savedRdModeList[puIndex] );
#if JVET_L0283_MULTI_REF_LINE
        std::copy_n(extendRefList.begin(), numModesForFullRD, m_savedExtendRefList[puIndex]);
#endif
      }
    }
    else //emtUsage = 2 (here we potentially reduce the number of modes that will be full-RD checked)
    {
      if( isAllIntra && m_pcEncCfg->getFastIntraEMT() )
      {
        double thresholdSkipMode;
        if( cs.pcv->noRQT )
        {
          thresholdSkipMode = 1.0 + 1.4 / sqrt( ( double ) ( width*height ) );
        }
        else
        {
          switch( width )
          {
          case  4: thresholdSkipMode = 1.47; break; // Skip checking   4x4 Intra modes using the R-D cost in the DCT2-pass
          case  8: thresholdSkipMode = 1.28; break; // Skip checking   8x8 Intra modes using the R-D cost in the DCT2-pass
          case 16: thresholdSkipMode = 1.12; break; // Skip checking 16x16 Intra modes using the R-D cost in the DCT2-pass
          case 32: thresholdSkipMode = 1.06; break; // Skip checking 32x32 Intra modes using the R-D cost in the DCT2-pass
          default: thresholdSkipMode = 1.06; break; // Skip checking 32x32 Intra modes using the R-D cost in the DCT2-pass
          }
        }

        numModesForFullRD = 0;

        // Skip checking the modes with much larger R-D cost than the best mode
        for( int i = 0; i < m_savedNumRdModes[puIndex]; i++ )
        {
          if( m_modeCostStore[puIndex][i] <= thresholdSkipMode * m_bestModeCostStore[puIndex] )
          {
            uiRdModeList.push_back( m_savedRdModeList[puIndex][i] );
#if JVET_L0283_MULTI_REF_LINE
            extendRefList.push_back(m_savedExtendRefList[puIndex][i]);
#endif
            numModesForFullRD++;
          }
        }
      }
      else //this is necessary because we skip the candidates list calculation, since it was already obtained for the DCT-II. Now we load it
      {
        // Restore the modes to be checked with RD
        numModesForFullRD = m_savedNumRdModes[puIndex];
        uiRdModeList.resize( numModesForFullRD );
        std::copy_n( m_savedRdModeList[puIndex], m_savedNumRdModes[puIndex], uiRdModeList.begin() );
#if JVET_L0283_MULTI_REF_LINE
        CandCostList.resize(numModesForFullRD);
        extendRefList.resize(numModesForFullRD);
        std::copy_n(m_savedExtendRefList[puIndex], m_savedNumRdModes[puIndex], extendRefList.begin());
#endif
      }
    }


    CHECK( numModesForFullRD != uiRdModeList.size(), "Inconsistent state!" );

    // after this point, don't use numModesForFullRD

    // PBINTRA fast
    if( m_pcEncCfg->getUsePbIntraFast() && !cs.slice->isIntra() && cu.partSize == SIZE_2Nx2N && uiRdModeList.size() < numModesAvailable && emtUsageFlag != 2 )
    {
      if( CandHadList.size() < 3 || CandHadList[2] > cs.interHad * PBINTRA_RATIO )
      {
        uiRdModeList.resize( std::min<size_t>( uiRdModeList.size(), 2 ) );
      }
      if( CandHadList.size() < 2 || CandHadList[1] > cs.interHad * PBINTRA_RATIO )
      {
        uiRdModeList.resize( std::min<size_t>( uiRdModeList.size(), 1 ) );
      }
      if( CandHadList.size() < 1 || CandHadList[0] > cs.interHad * PBINTRA_RATIO )
      {
        cs.dist = std::numeric_limits<Distortion>::max();
        cs.interHad = 0;

        //===== reset context models =====
        m_CABACEstimator->getCtx() = SubCtx( Ctx::IPredMode       [CHANNEL_TYPE_LUMA], ctxStartIntraMode );

        return;
      }
    }

    //===== check modes (using r-d costs) =====
    uint32_t       uiBestPUMode  = 0;
#if JVET_L0283_MULTI_REF_LINE
    int            bestExtendRef = 0;
#endif

    CodingStructure *csTemp = m_pTempCS[gp_sizeIdxInfo->idxFrom( cu.lwidth() )][gp_sizeIdxInfo->idxFrom( cu.lheight() )];
    CodingStructure *csBest = m_pBestCS[gp_sizeIdxInfo->idxFrom( cu.lwidth() )][gp_sizeIdxInfo->idxFrom( cu.lheight() )];

    csTemp->slice = cs.slice;
    csBest->slice = cs.slice;
    csTemp->initStructData();
    csBest->initStructData();

    // just to be sure
    numModesForFullRD = ( int ) uiRdModeList.size();
    for (uint32_t uiMode = 0; uiMode < numModesForFullRD; uiMode++)
    {
      // set luma prediction mode
      uint32_t uiOrgMode = uiRdModeList[uiMode];

      pu.intraDir[0] = uiOrgMode;
#if JVET_L0283_MULTI_REF_LINE
      int multiRefIdx = extendRefList[uiMode];
      pu.multiRefIdx  = multiRefIdx;
      CHECK(pu.multiRefIdx && (pu.intraDir[0] == DC_IDX || pu.intraDir[0] == PLANAR_IDX), "ERL");
#endif


      // set context models
      m_CABACEstimator->getCtx() = ctxStart;

      // determine residual for partition
      cs.initSubStructure( *csTemp, partitioner.chType, cs.area, true );

      xRecurIntraCodingLumaQT( *csTemp, partitioner );

      if( emtUsageFlag == 1 && m_pcEncCfg->getFastIntraEMT() )
      {
        m_modeCostStore[puIndex][uiMode] = csTemp->cost; //cs.cost;
      }


      DTRACE( g_trace_ctx, D_INTRA_COST, "IntraCost T %f (%d) \n", csTemp->cost, uiOrgMode );

      // check r-d cost
      if( csTemp->cost < csBest->cost )
      {
        std::swap( csTemp, csBest );

        uiBestPUMode  = uiOrgMode;
#if JVET_L0283_MULTI_REF_LINE
        bestExtendRef = multiRefIdx;
#endif

        if( ( emtUsageFlag == 1 ) && m_pcEncCfg->getFastIntraEMT() )
        {
          m_bestModeCostStore[puIndex] = csBest->cost; //cs.cost;
        }
      }

      csTemp->releaseIntermediateData();
    } // Mode loop

    cs.useSubStructure( *csBest, partitioner.chType, pu.singleChan( CHANNEL_TYPE_LUMA ), KEEP_PRED_AND_RESI_SIGNALS, true, keepResi, keepResi );

    csBest->releaseIntermediateData();
    //=== update PU data ====
    pu.intraDir[0] = uiBestPUMode;
#if JVET_L0283_MULTI_REF_LINE
    pu.multiRefIdx = bestExtendRef;
#endif
  }

  //===== reset context models =====
  m_CABACEstimator->getCtx() = ctxStart;
}

void IntraSearch::estIntraPredChromaQT(CodingUnit &cu, Partitioner &partitioner)
{
  const ChromaFormat format   = cu.chromaFormat;
  const uint32_t    numberValidComponents = getNumberValidComponents(format);
  CodingStructure &cs = *cu.cs;
  const TempCtx ctxStart  ( m_CtxCache, m_CABACEstimator->getCtx() );

  cs.setDecomp( cs.area.Cb(), false );

  auto &pu = *cu.firstPU;

  {
    uint32_t       uiBestMode = 0;
    Distortion uiBestDist = 0;
    double     dBestCost = MAX_DOUBLE;

    //----- init mode list ----
    {
      uint32_t  uiMinMode = 0;
      uint32_t  uiMaxMode = NUM_CHROMA_MODE;

      //----- check chroma modes -----
      uint32_t chromaCandModes[ NUM_CHROMA_MODE ];
      PU::getIntraChromaCandModes( pu, chromaCandModes );

      // create a temporary CS
      CodingStructure &saveCS = *m_pSaveCS[0];
      saveCS.pcv      = cs.pcv;
      saveCS.picture  = cs.picture;
      saveCS.area.repositionTo( cs.area );
      saveCS.clearTUs();

      if( CS::isDualITree( cs ) )
      {
        if( partitioner.canSplit( TU_MAX_TR_SPLIT, cs ) )
        {
          partitioner.splitCurrArea( TU_MAX_TR_SPLIT, cs );

          do
          {
            cs.addTU( CS::getArea( cs, partitioner.currArea(), partitioner.chType ), partitioner.chType ).depth = partitioner.currTrDepth;
          } while( partitioner.nextPart( cs ) );

          partitioner.exitCurrSplit();
        }
        else
        cs.addTU( CS::getArea( cs, partitioner.currArea(), partitioner.chType ), partitioner.chType );
      }

      std::vector<TransformUnit*> orgTUs;


      // create a store for the TUs
      for( const auto &ptu : cs.tus )
      {
        // for split TUs in HEVC, add the TUs without Chroma parts for correct setting of Cbfs
        if( pu.contains( *ptu, CHANNEL_TYPE_CHROMA ) || ( !cs.pcv->noRQT && !ptu->Cb().valid() && !ptu->Cr().valid() ) )
        {
          saveCS.addTU( *ptu, partitioner.chType );
          orgTUs.push_back( ptu );
        }
      }
#if JVET_L0338_MDLM
      // SATD pre-selecting.
      int satdModeList[NUM_CHROMA_MODE];
      int64_t satdSortedCost[NUM_CHROMA_MODE];
      for (int i = 0; i < NUM_CHROMA_MODE; i++)
      {
        satdSortedCost[i] = 0; // for the mode not pre-select by SATD, do RDO by default, so set the initial value 0.
        satdModeList[i] = 0;
      }
      bool modeIsEnable[NUM_INTRA_MODE + 1]; // use intra mode idx to check whether enable
      for (int i = 0; i < NUM_INTRA_MODE + 1; i++)
      {
        modeIsEnable[i] = 1;
      }

      DistParam distParam;
      const bool useHadamard = true;
      pu.intraDir[1] = MDLM_L_IDX; // temporary assigned, just to indicate this is a MDLM mode. for luma down-sampling operation.

      initIntraPatternChType(cu, pu.Cb());
      initIntraPatternChType(cu, pu.Cr());
      xGetLumaRecPixels(pu, pu.Cb());

      for (int idx = uiMinMode; idx <= uiMaxMode - 1; idx++)
      {
        int mode = chromaCandModes[idx];
        satdModeList[idx] = mode;
        if (PU::isLMCMode(mode) && !PU::isLMCModeEnabled(pu, mode))
        {
          continue;
        }
        if ((mode == LM_CHROMA_IDX) || (mode == PLANAR_IDX) || (mode == DM_CHROMA_IDX)) // only pre-check regular modes and MDLM modes, not including DM ,Planar, and LM
        {
          continue;
        }
        pu.intraDir[1] = mode; // temporary assigned, for SATD checking.

        int64_t sad = 0;
        CodingStructure& cs = *(pu.cs);

        CompArea areaCb = pu.Cb();
        PelBuf orgCb = cs.getOrgBuf(areaCb);
        PelBuf predCb = cs.getPredBuf(areaCb);

        m_pcRdCost->setDistParam(distParam, orgCb, predCb, pu.cs->sps->getBitDepth(CHANNEL_TYPE_CHROMA), COMPONENT_Cb, useHadamard);
        distParam.applyWeight = false;

        if (PU::isLMCMode(mode))
        {
          predIntraChromaLM(COMPONENT_Cb, predCb, pu, areaCb, mode);
        }
        else
        {
          predIntraAng(COMPONENT_Cb, predCb, pu, false);
        }

        sad += distParam.distFunc(distParam);

        CompArea areaCr = pu.Cr();
        PelBuf orgCr = cs.getOrgBuf(areaCr);
        PelBuf predCr = cs.getPredBuf(areaCr);

        m_pcRdCost->setDistParam(distParam, orgCr, predCr, pu.cs->sps->getBitDepth(CHANNEL_TYPE_CHROMA), COMPONENT_Cr, useHadamard);
        distParam.applyWeight = false;

        if (PU::isLMCMode(mode))
        {
          predIntraChromaLM(COMPONENT_Cr, predCr, pu, areaCr, mode);
        }
        else
        {
          predIntraAng(COMPONENT_Cr, predCr, pu, false);
        }
        sad += distParam.distFunc(distParam);
        satdSortedCost[idx] = sad;
      }
      // sort the mode based on the cost from small to large.
      int tempIdx = 0;
      int64_t tempCost = 0;
      for (int i = uiMinMode; i <= uiMaxMode - 1; i++)
      {
        for (int j = i + 1; j <= uiMaxMode - 1; j++)
        {
          if (satdSortedCost[j] < satdSortedCost[i])
          {
            tempIdx = satdModeList[i];
            satdModeList[i] = satdModeList[j];
            satdModeList[j] = tempIdx;

            tempCost = satdSortedCost[i];
            satdSortedCost[i] = satdSortedCost[j];
            satdSortedCost[j] = tempCost;

          }
        }
      }
      int reducedModeNumber = 2; // reduce the number of chroma modes
      for (int i = 0; i < reducedModeNumber; i++)
      {
        modeIsEnable[satdModeList[uiMaxMode - 1 - i]] = 0; // disable the last reducedModeNumber modes
      }
#endif

      // save the dist
      Distortion baseDist = cs.dist;

      for (uint32_t uiMode = uiMinMode; uiMode < uiMaxMode; uiMode++)
      {
        const int chromaIntraMode = chromaCandModes[uiMode];
        if( PU::isLMCMode( chromaIntraMode ) && ! PU::isLMCModeEnabled( pu, chromaIntraMode ) )
        {
          continue;
        }
#if JVET_L0338_MDLM
        if (!modeIsEnable[chromaIntraMode] && PU::isLMCModeEnabled(pu, chromaIntraMode)) // when CCLM is disable, then MDLM is disable. not use satd checking
        {
          continue;
        }
#endif
        cs.setDecomp( pu.Cb(), false );
        cs.dist = baseDist;
        //----- restore context models -----
        m_CABACEstimator->getCtx() = ctxStart;

        //----- chroma coding -----
        pu.intraDir[1] = chromaIntraMode;

        xRecurIntraChromaCodingQT( cs, partitioner );

        if (cs.pps->getUseTransformSkip())
        {
          m_CABACEstimator->getCtx() = ctxStart;
        }

        uint64_t fracBits   = xGetIntraFracBitsQT( cs, partitioner, false, true );
        Distortion uiDist = cs.dist;
        double    dCost   = m_pcRdCost->calcRdCost( fracBits, uiDist - baseDist );

        //----- compare -----
        if( dCost < dBestCost )
        {
          for( uint32_t i = getFirstComponentOfChannel( CHANNEL_TYPE_CHROMA ); i < numberValidComponents; i++ )
          {
            const CompArea &area = pu.blocks[i];

            saveCS.getRecoBuf     ( area ).copyFrom( cs.getRecoBuf   ( area ) );
#if KEEP_PRED_AND_RESI_SIGNALS
            saveCS.getPredBuf     ( area ).copyFrom( cs.getPredBuf   ( area ) );
            saveCS.getResiBuf     ( area ).copyFrom( cs.getResiBuf   ( area ) );
#endif
            cs.picture->getRecoBuf( area ).copyFrom( cs.getRecoBuf( area ) );

            for( uint32_t j = 0; j < saveCS.tus.size(); j++ )
            {
              saveCS.tus[j]->copyComponentFrom( *orgTUs[j], area.compID );
            }
          }

          dBestCost  = dCost;
          uiBestDist = uiDist;
          uiBestMode = chromaIntraMode;
        }
      }

      for( uint32_t i = getFirstComponentOfChannel( CHANNEL_TYPE_CHROMA ); i < numberValidComponents; i++ )
      {
        const CompArea &area = pu.blocks[i];

        cs.getRecoBuf         ( area ).copyFrom( saveCS.getRecoBuf( area ) );
#if KEEP_PRED_AND_RESI_SIGNALS
        cs.getPredBuf         ( area ).copyFrom( saveCS.getPredBuf( area ) );
        cs.getResiBuf         ( area ).copyFrom( saveCS.getResiBuf( area ) );
#endif
        cs.picture->getRecoBuf( area ).copyFrom( cs.    getRecoBuf( area ) );

        for( uint32_t j = 0; j < saveCS.tus.size(); j++ )
        {
          orgTUs[ j ]->copyComponentFrom( *saveCS.tus[ j ], area.compID );
        }
      }
    }

    pu.intraDir[1] = uiBestMode;
    cs.dist        = uiBestDist;
  }

  //----- restore context models -----
  m_CABACEstimator->getCtx() = ctxStart;
}