IntraSearch.cpp 72.2 KB
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/* The copyright in this software is being made available under the BSD
 * License, included below. This software may be subject to other third party
 * and contributor rights, including patent rights, and no such rights are
 * granted under this license.
 *
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 * Copyright (c) 2010-2019, ITU/ISO/IEC
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 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  * Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *  * Neither the name of the ITU/ISO/IEC nor the names of its contributors may
 *    be used to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

/** \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)
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#if JVET_M0427_INLOOP_RESHAPER
  , m_pcReshape     (nullptr)
#endif
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  , 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 )
  {
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    const uint32_t uiNumLayersToAllocateSplit = 1;
    const uint32_t uiNumLayersToAllocateFull  = 1;
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    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++ )
      {
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        if( gp_sizeIdxInfo->isCuSize( gp_sizeIdxInfo->sizeFrom( width ) ) && gp_sizeIdxInfo->isCuSize( gp_sizeIdxInfo->sizeFrom( height ) ) )
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        {
          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;
  }

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#if JVET_M0427_INLOOP_RESHAPER
  m_tmpStorageLCU.destroy();
#endif
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  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
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#if JVET_M0427_INLOOP_RESHAPER
                       , EncReshape*   pcReshape
#endif
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)
{
  CHECK(m_isInitialized, "Already initialized");
  m_pcEncCfg                     = pcEncCfg;
  m_pcTrQuant                    = pcTrQuant;
  m_pcRdCost                     = pcRdCost;
  m_CABACEstimator               = CABACEstimator;
  m_CtxCache                     = ctxCache;
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#if JVET_M0427_INLOOP_RESHAPER
  m_pcReshape                    = pcReshape;
#endif
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  const ChromaFormat cform = pcEncCfg->getChromaFormatIdc();

  IntraPrediction::init( cform, pcEncCfg->getBitDepth( CHANNEL_TYPE_LUMA ) );
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#if JVET_M0427_INLOOP_RESHAPER
  m_tmpStorageLCU.create(UnitArea(cform, Area(0, 0, MAX_CU_SIZE, MAX_CU_SIZE)));
#endif
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  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();

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  const uint32_t uiNumLayersToAllocateSplit = 1;
  const uint32_t uiNumLayersToAllocateFull  = 1;
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  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++ )
    {
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      if(  gp_sizeIdxInfo->isCuSize( gp_sizeIdxInfo->sizeFrom( width ) ) && gp_sizeIdxInfo->isCuSize( gp_sizeIdxInfo->sizeFrom( height ) ) )
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      {
        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;
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  const uint32_t             uiWidthBit    = g_aucLog2[partitioner.currArea().lwidth() ];
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  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() ) );
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  const TempCtx ctxStartMHIntraMode ( m_CtxCache, SubCtx( Ctx::MHIntraPredMode,        m_CABACEstimator->getCtx() ) );
  const TempCtx ctxStartMrlIdx      ( m_CtxCache, SubCtx( Ctx::MultiRefLineIdx,        m_CABACEstimator->getCtx() ) );
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  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

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#if !JVET_M0464_UNI_MTS
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  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;
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  const int maxSizeEMT = EMT_INTRA_MAX_CU_WITH_QTBT;
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  if( width <= maxSizeEMT && height <= maxSizeEMT && sps.getSpsNext().getUseIntraEMT() )
  {
    emtUsageFlag = cu.emtFlag == 1 ? 2 : 1;
  }

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

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

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  static_vector<int, FAST_UDI_MAX_RDMODE_NUM> extendRefList;
  static_vector<int, FAST_UDI_MAX_RDMODE_NUM>* nullList = NULL;

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  auto &pu = *cu.firstPU;
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#if !JVET_M0464_UNI_MTS
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  int puIndex = 0;
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#endif
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  {
    CandHadList.clear();
    CandCostList.clear();
    uiHadModeList.clear();
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    extendRefList.clear();
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    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;
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    numModesForFullRD = g_aucIntraModeNumFast_UseMPM_2D[uiWidthBit - MIN_CU_LOG2][uiHeightBit - MIN_CU_LOG2];
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#if INTRA_FULL_SEARCH
    numModesForFullRD = numModesAvailable;
#endif

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#if !JVET_M0464_UNI_MTS
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    if( emtUsageFlag != 2 )
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#endif
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    {
      // this should always be true
      CHECK( !pu.Y().valid(), "PU is not valid" );
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      bool isFirstLineOfCtu = (((pu.block(COMPONENT_Y).y)&((pu.cs->sps)->getMaxCUWidth() - 1)) == 0);
      int numOfPassesExtendRef = (isFirstLineOfCtu ? 1 : MRL_NUM_REF_LINES);
      pu.multiRefIdx = 0;
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      //===== 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;

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#if JVET_M0427_INLOOP_RESHAPER
        if (cu.slice->getReshapeInfo().getUseSliceReshaper() && m_pcReshape->getCTUFlag())
        {
          CompArea      tmpArea(COMPONENT_Y, area.chromaFormat, Position(0, 0), area.size());
          PelBuf tmpOrg = m_tmpStorageLCU.getBuf(tmpArea);
          tmpOrg.copyFrom(piOrg);
          tmpOrg.rspSignal(m_pcReshape->getFwdLUT());
          m_pcRdCost->setDistParam(distParam, tmpOrg, piPred, sps.getBitDepth(CHANNEL_TYPE_LUMA), COMPONENT_Y, bUseHadamard);
        }
        else
#endif
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        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 );
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            m_CABACEstimator->getCtx() = SubCtx( Ctx::MHIntraPredMode, ctxStartMHIntraMode );
            m_CABACEstimator->getCtx() = SubCtx( Ctx::MultiRefLineIdx, ctxStartMrlIdx );
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            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 );

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

        // forget the extra modes
        uiRdModeList.resize( numModesForFullRD );
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        CandCostList.resize(numModesForFullRD);
        extendRefList.resize(numModesForFullRD);
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        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.
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                m_CABACEstimator->getCtx() = SubCtx( Ctx::IPredMode[CHANNEL_TYPE_LUMA], ctxStartIntraMode );
                m_CABACEstimator->getCtx() = SubCtx( Ctx::MHIntraPredMode, ctxStartMHIntraMode );
                m_CABACEstimator->getCtx() = SubCtx( Ctx::MultiRefLineIdx, ctxStartMrlIdx );
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                uint64_t fracModeBits = xFracModeBitsIntra(pu, mode, CHANNEL_TYPE_LUMA);

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

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                updateCandList(mode, cost, uiRdModeList, CandCostList
                  , extendRefList, 0
                  , numModesForFullRD);
                updateCandList(mode, (double)sad, uiHadModeList, CandHadList
                  , *nullList, -1
                  , 3);
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                bSatdChecked[mode] = true;
              }
            }
          }
        }
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        pu.multiRefIdx = 1;
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        const int  numMPMs = NUM_MOST_PROBABLE_MODES;
        unsigned  multiRefMPM [numMPMs];
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        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.
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              m_CABACEstimator->getCtx() = SubCtx( Ctx::IPredMode[CHANNEL_TYPE_LUMA], ctxStartIntraMode );
              m_CABACEstimator->getCtx() = SubCtx( Ctx::MHIntraPredMode, ctxStartMHIntraMode );
              m_CABACEstimator->getCtx() = SubCtx( Ctx::MultiRefLineIdx, ctxStartMrlIdx );
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              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);
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        if( m_pcEncCfg->getFastUDIUseMPMEnabled() )
        {
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          const int numMPMs = NUM_MOST_PROBABLE_MODES;
          unsigned  uiPreds[numMPMs];
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          pu.multiRefIdx = 0;

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          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++ )
            {
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              mostProbableModeIncluded |= (mostProbableMode == uiRdModeList[i] && extendRefList[i] == 0);
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            }
            if( !mostProbableModeIncluded )
            {
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              extendRefList.push_back(0);
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              numModesForFullRD++;
              uiRdModeList.push_back( mostProbableMode );
            }
          }
        }
      }
      else
      {
        for( int i = 0; i < numModesForFullRD; i++ )
        {
          uiRdModeList.push_back( i );
        }
      }
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#if !JVET_M0464_UNI_MTS
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      if( emtUsageFlag == 1 )
      {
        // Store the modes to be checked with RD
        m_savedNumRdModes[puIndex] = numModesForFullRD;
        std::copy_n( uiRdModeList.begin(), numModesForFullRD, m_savedRdModeList[puIndex] );
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        std::copy_n(extendRefList.begin(), numModesForFullRD, m_savedExtendRefList[puIndex]);
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      }
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#endif
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    }
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#if !JVET_M0464_UNI_MTS
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    else //emtUsage = 2 (here we potentially reduce the number of modes that will be full-RD checked)
    {
      if( isAllIntra && m_pcEncCfg->getFastIntraEMT() )
      {
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        double thresholdSkipMode = 1.0 + 1.4 / sqrt( ( double ) ( width*height ) );
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        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] );
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            extendRefList.push_back(m_savedExtendRefList[puIndex][i]);
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            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() );
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        CandCostList.resize(numModesForFullRD);
        extendRefList.resize(numModesForFullRD);
        std::copy_n(m_savedExtendRefList[puIndex], m_savedNumRdModes[puIndex], extendRefList.begin());
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      }
    }
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#endif
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    CHECK( numModesForFullRD != uiRdModeList.size(), "Inconsistent state!" );

    // after this point, don't use numModesForFullRD

    // PBINTRA fast
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#if JVET_M0464_UNI_MTS
    if( m_pcEncCfg->getUsePbIntraFast() && !cs.slice->isIntra() && uiRdModeList.size() < numModesAvailable )
#else
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    if( m_pcEncCfg->getUsePbIntraFast() && !cs.slice->isIntra() && uiRdModeList.size() < numModesAvailable && emtUsageFlag != 2 )
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#endif
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    {
      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 =====
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        m_CABACEstimator->getCtx() = SubCtx( Ctx::IPredMode[CHANNEL_TYPE_LUMA], ctxStartIntraMode );
        m_CABACEstimator->getCtx() = SubCtx( Ctx::MHIntraPredMode, ctxStartMHIntraMode );
        m_CABACEstimator->getCtx() = SubCtx( Ctx::MultiRefLineIdx, ctxStartMrlIdx );
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        return;
      }
    }

    //===== check modes (using r-d costs) =====
    uint32_t       uiBestPUMode  = 0;
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    int            bestExtendRef = 0;
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    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;
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      int multiRefIdx = extendRefList[uiMode];
      pu.multiRefIdx  = multiRefIdx;
      CHECK(pu.multiRefIdx && (pu.intraDir[0] == DC_IDX || pu.intraDir[0] == PLANAR_IDX), "ERL");
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      // set context models
      m_CABACEstimator->getCtx() = ctxStart;

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

      xRecurIntraCodingLumaQT( *csTemp, partitioner );

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#if !JVET_M0464_UNI_MTS
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      if( emtUsageFlag == 1 && m_pcEncCfg->getFastIntraEMT() )
      {
        m_modeCostStore[puIndex][uiMode] = csTemp->cost; //cs.cost;
      }
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#endif
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      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;
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        bestExtendRef = multiRefIdx;
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        if( ( emtUsageFlag == 1 ) && m_pcEncCfg->getFastIntraEMT() )
        {
          m_bestModeCostStore[puIndex] = csBest->cost; //cs.cost;
        }
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      }

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

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#if JVET_M0427_INLOOP_RESHAPER
    cs.useSubStructure(*csBest, partitioner.chType, pu.singleChan(CHANNEL_TYPE_LUMA), true, true, keepResi, keepResi);
#else
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    cs.useSubStructure( *csBest, partitioner.chType, pu.singleChan( CHANNEL_TYPE_LUMA ), KEEP_PRED_AND_RESI_SIGNALS, true, keepResi, keepResi );
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#endif
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    csBest->releaseIntermediateData();
    //=== update PU data ====
    pu.intraDir[0] = uiBestPUMode;
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    pu.multiRefIdx = bestExtendRef;
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  }

  //===== 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
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        if( pu.contains( *ptu, CHANNEL_TYPE_CHROMA ) )
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        {
          saveCS.addTU( *ptu, partitioner.chType );
          orgTUs.push_back( ptu );
        }
      }
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      // 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;
        }
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        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
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        {
          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);
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        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
      }
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      // 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;
        }
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        if (!modeIsEnable[chromaIntraMode] && PU::isLMCModeEnabled(pu, chromaIntraMode)) // when CCLM is disable, then MDLM is disable. not use satd checking
        {
          continue;
        }
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        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 ) );
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#endif
#if JVET_M0427_INLOOP_RESHAPER
            saveCS.getPredBuf     ( area ).copyFrom( cs.getPredBuf   (area ) );
            cs.picture->getPredBuf( area ).copyFrom( cs.getPredBuf   (area ) );
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#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
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#if JVET_M0427_INLOOP_RESHAPER
        cs.getPredBuf         ( area ).copyFrom( saveCS.getPredBuf( area ) );
        cs.picture->getPredBuf( area ).copyFrom( cs.getPredBuf    ( area ) );
#endif

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        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;
}

void IntraSearch::IPCMSearch(CodingStructure &cs, Partitioner& partitioner)
{
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  ComponentID compStr = (CS::isDualITree(cs) && !isLuma(partitioner.chType)) ? COMPONENT_Cb: COMPONENT_Y;
  ComponentID compEnd = (CS::isDualITree(cs) && isLuma(partitioner.chType)) ? COMPONENT_Y : COMPONENT_Cr;
  for( ComponentID compID = compStr; compID <= compEnd; compID = ComponentID(compID+1) )
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  {

    xEncPCM(cs, partitioner, compID);
  }

  cs.getPredBuf().fill(0);
  cs.getResiBuf().fill(0);
  cs.getOrgResiBuf().fill(0);

  cs.dist     = 0;
  cs.fracBits = 0;
  cs.cost     = 0;

  cs.setDecomp(cs.area);
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#if JVET_M0427_INLOOP_RESHAPER
  cs.picture->getPredBuf(cs.area).copyFrom(cs.getPredBuf());
#endif 
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}

void IntraSearch::xEncPCM(CodingStructure &cs, Partitioner& partitioner, const ComponentID &compID)
{
  TransformUnit &tu = *cs.getTU( partitioner.chType );

  const int  channelBitDepth = cs.sps->getBitDepth(toChannelType(compID));
  const uint32_t uiPCMBitDepth = cs.sps->getPCMBitDepth(toChannelType(compID));

  const int pcmShiftRight = (channelBitDepth - int(uiPCMBitDepth));

  CompArea  area    = tu.blocks[compID];
  PelBuf    pcmBuf  = tu.getPcmbuf  (compID);
  PelBuf    recBuf  = cs.getRecoBuf ( area );
  CPelBuf   orgBuf  = cs.getOrgBuf  ( area );

  CHECK(pcmShiftRight < 0, "Negative shift");

  for (uint32_t uiY = 0; uiY < pcmBuf.height; uiY++)
  {
    for (uint32_t uiX = 0; uiX < pcmBuf.width; uiX++)
    {
      // Encode
      pcmBuf.at(uiX, uiY) = orgBuf.at(uiX, uiY) >> pcmShiftRight;
      // Reconstruction
      recBuf.at(uiX, uiY) = pcmBuf.at(uiX, uiY) << pcmShiftRight;
    }
  }
}

// -------------------------------------------------------------------------------------------------------------------
// Intra search
// -------------------------------------------------------------------------------------------------------------------

void IntraSearch::xEncIntraHeader(CodingStructure &cs, Partitioner &partitioner, const bool &bLuma, const bool &bChroma)
{
  CodingUnit &cu = *cs.getCU( partitioner.chType );

  if (bLuma)
  {
    bool isFirst = partitioner.currArea().lumaPos() == cs.area.lumaPos();

    // CU header
    if( isFirst )
    {
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      if( !cs.slice->isIntra() 
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        && cu.Y().valid()
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        )
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      {
        if( cs.pps->getTransquantBypassEnabledFlag() )
        {
          m_CABACEstimator->cu_transquant_bypass_flag( cu );
        }
        m_CABACEstimator->cu_skip_flag( cu );
        m_CABACEstimator->pred_mode   ( cu );
      }
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      m_CABACEstimator->extend_ref_line(cu);
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      if( CU::isIntra(cu) )
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      {
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        m_CABACEstimator->pcm_data( cu, partitioner );
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        if( cu.ipcm )
        {
          return;
        }
      }
    }

    PredictionUnit &pu = *cs.getPU(partitioner.currArea().lumaPos(), partitioner.chType);

    // luma prediction mode
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    if (isFirst)
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    {
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      if ( !cu.Y().valid())
        m_CABACEstimator->pred_mode( cu );
      m_CABACEstimator->intra_luma_pred_mode( pu );
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    }
  }

  if (bChroma)
  {
    bool isFirst = partitioner.currArea().Cb().valid() && partitioner.currArea().chromaPos() == cs.area.chromaPos();

    PredictionUnit &pu = *cs.getPU( partitioner.currArea().chromaPos(), CHANNEL_TYPE_CHROMA );

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    if( isFirst )
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    {
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      m_CABACEstimator->intra_chroma_pred_mode( pu );
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    }
  }
}

void IntraSearch::xEncSubdivCbfQT(CodingStructure &cs, Partitioner &partitioner, const bool &bLuma, const bool &bChroma)
{
  const UnitArea &currArea = partitioner.currArea();
  TransformUnit &currTU    = *cs.getTU( currArea.blocks[partitioner.chType], partitioner.chType );
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#if !JVET_M0464_UNI_MTS
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  CodingUnit &currCU       = *currTU.cu;
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#endif
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  uint32_t currDepth           = partitioner.currTrDepth;

  const bool subdiv        = currTU.depth > currDepth;

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  if( partitioner.canSplit( TU_MAX_TR_SPLIT, cs ) )
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  {
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    CHECK( !subdiv, "TU split implied" );
  }
  else
  {
    CHECK( subdiv, "No TU subdivision is allowed with QTBT" );
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  }

  if (bChroma)
  {
    const uint32_t numberValidComponents = getNumberValidComponents(currArea.chromaFormat);

    for (uint32_t ch = COMPONENT_Cb; ch < numberValidComponents; ch++)
    {
      const ComponentID compID = ComponentID(ch);

      if( currDepth == 0 || TU::getCbfAtDepth( currTU, compID, currDepth - 1 ) )
      {
        const bool prevCbf = ( compID == COMPONENT_Cr ? TU::getCbfAtDepth( currTU, COMPONENT_Cb, currDepth ) : false );
        m_CABACEstimator->cbf_comp( cs, TU::getCbfAtDepth( currTU, compID, currDepth ), currArea.blocks[compID], currDepth, prevCbf );

      }
    }
  }

  if (subdiv)
  {
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#if !JVET_M0464_UNI_MTS
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    if( currDepth == 0 && bLuma ) m_CABACEstimator->emt_cu_flag( currCU );
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#endif
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    if( partitioner.canSplit( TU_MAX_TR_SPLIT, cs ) )
    {
      partitioner.splitCurrArea( TU_MAX_TR_SPLIT, cs );
    }
    else
    THROW( "Cannot perform an implicit split!" );

    do
    {
      xEncSubdivCbfQT( cs, partitioner, bLuma, bChroma );
    } while( partitioner.nextPart( cs ) );

    partitioner.exitCurrSplit();
  }
  else
  {
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#if !JVET_M0464_UNI_MTS
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    if( currDepth == 0 && bLuma && TU::getCbfAtDepth( currTU, COMPONENT_Y, 0 ) ) m_CABACEstimator->emt_cu_flag( currCU );
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#endif
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    //===== Cbfs =====
    if (bLuma)
    {
      m_CABACEstimator->cbf_comp( cs, TU::getCbfAtDepth( currTU, COMPONENT_Y, currDepth ), currTU.Y(), currTU.depth );
    }
  }
}

void IntraSearch::xEncCoeffQT(CodingStructure &cs, Partitioner &partitioner, const ComponentID &compID)
{
  const UnitArea &currArea  = partitioner.currArea();
  TransformUnit &currTU     = *cs.getTU( currArea.blocks[partitioner.chType], partitioner.chType );
  uint32_t      currDepth       = partitioner.currTrDepth;
  const bool subdiv         = currTU.depth > currDepth;

  if (subdiv)
  {
    if (partitioner.canSplit(TU_MAX_TR_SPLIT, cs))
    {
      partitioner.splitCurrArea(TU_MAX_TR_SPLIT, cs);
    }
    else
      THROW("Implicit TU split not available!");

    do
    {
      xEncCoeffQT( cs, partitioner, compID );
    } while( partitioner.nextPart( cs ) );

    partitioner.exitCurrSplit();
  }
  else

  if( currArea.blocks[compID].valid() )
  {
    if( TU::hasCrossCompPredInfo( currTU, compID ) )
    {
      m_CABACEstimator->cross_comp_pred( currTU, compID );
    }
    if( TU::getCbf( currTU, compID ) )
    {
      m_CABACEstimator->residual_coding( currTU, compID );
    }
  }
}

uint64_t IntraSearch::xGetIntraFracBitsQT( CodingStructure &cs, Partitioner &partitioner, const bool &bLuma, const bool &bChroma )
{
  m_CABACEstimator->resetBits();

  xEncIntraHeader( cs, partitioner, bLuma, bChroma );
  xEncSubdivCbfQT( cs, partitioner, bLuma, bChroma );

  if( bLuma )
  {
    xEncCoeffQT( cs, partitioner, COMPONENT_Y );
  }
  if( bChroma )
  {
    xEncCoeffQT( cs, partitioner, COMPONENT_Cb );
    xEncCoeffQT( cs, partitioner, COMPONENT_Cr );
  }

  uint64_t fracBits = m_CABACEstimator->getEstFracBits();
  return fracBits;
}

uint64_t IntraSearch::xGetIntraFracBitsQTChroma(TransformUnit& currTU, const ComponentID &compID)
{
  m_CABACEstimator->resetBits();

  if( TU::hasCrossCompPredInfo( currTU, compID ) )
  {
    m_CABACEstimator->cross_comp_pred( currTU, compID );
  }
  if( TU::getCbf( currTU, compID ) )
  {
    m_CABACEstimator->residual_coding( currTU, compID );
  }

  uint64_t fracBits = m_CABACEstimator->getEstFracBits();
  return fracBits;
}

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#if JVET_M0464_UNI_MTS
void IntraSearch::xIntraCodingTUBlock(TransformUnit &tu, const ComponentID &compID, const bool &checkCrossCPrediction, Distortion& ruiDist, const int &default0Save1Load2, uint32_t* numSig, std::vector<TrMode>* trModes, const bool loadTr)
#else
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void IntraSearch::xIntraCodingTUBlock(TransformUnit &tu, const ComponentID &compID, const bool &checkCrossCPrediction, Distortion& ruiDist, const int &default0Save1Load2, uint32_t* numSig )
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#endif
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{
  if (!tu.blocks[compID].valid())
  {
    return;
  }

  CodingStructure &cs                       = *tu.cs;

  const CompArea      &area                 = tu.blocks[compID];
  const SPS           &sps                  = *cs.sps;
  const PPS           &pps                  = *cs.pps;

  const ChannelType    chType               = toChannelType(compID);
  const int            bitDepth             = sps.getBitDepth(chType);

  PelBuf         piOrg                      = cs.getOrgBuf    (area);
  PelBuf         piPred                     = cs.getPredBuf   (area);
  PelBuf         piResi                     = cs.getResiBuf   (area);
  PelBuf         piOrgResi                  = cs.getOrgResiBuf(area);
  PelBuf         piReco                     = cs.getRecoBuf   (area);

  const PredictionUnit &pu                  = *cs.getPU(area.pos(), chType);
  const uint32_t           uiChFinalMode        = PU::getFinalIntraMode(pu, chType);

  const bool           bUseCrossCPrediction = pps.getPpsRangeExtension().getCrossComponentPredictionEnabledFlag() && isChroma( compID ) && PU::isChromaIntraModeCrossCheckMode( pu ) && checkCrossCPrediction;
  const bool           ccUseRecoResi        = m_pcEncCfg->getUseReconBasedCrossCPredictionEstimate();


  //===== init availability pattern =====
  PelBuf sharedPredTS( m_pSharedPredTransformSkip[compID], area );
  if( default0Save1Load2 != 2 )
  {
    const bool bUseFilteredPredictions = IntraPrediction::useFilteredIntraRefSamples( compID, pu, true, tu );
    initIntraPatternChType( *tu.cu, area, bUseFilteredPredictions );

    //===== get prediction signal =====
    if( compID != COMPONENT_Y && PU::isLMCMode( uiChFinalMode ) )
    {
      {
        xGetLumaRecPixels( pu, area );
      }
      predIntraChromaLM( compID, piPred, pu, area, uiChFinalMode );
    }
    else
    {
      predIntraAng( compID, piPred, pu, bUseFilteredPredictions );
    }


    // save prediction
    if( default0Save1Load2 == 1 )
    {
      sharedPredTS.copyFrom( piPred );
    }
  }
  else
  {
    // load prediction
    piPred.copyFrom( sharedPredTS );
  }


  DTRACE( g_trace_ctx, D_PRED, "@(%4d,%4d) [%2dx%2d] IMode=%d\n", tu.lx(), tu.ly(), tu.lwidth(), tu.lheight(), uiChFinalMode );
  //DTRACE_PEL_BUF( D_PRED, piPred, tu, tu.cu->predMode, COMPONENT_Y );

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#if JVET_M0427_INLOOP_RESHAPER
  const Slice           &slice = *cs.slice;
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  bool flag = slice.getReshapeInfo().getUseSliceReshaper() && (slice.isIntra() || (!slice.isIntra() && m_pcReshape->getCTUFlag()) || (slice.getSliceType() == P_SLICE && slice.getSPS()->getSpsNext().getIBCMode()));
  if (flag && slice.getReshapeInfo().getSliceReshapeChromaAdj() && isChroma(compID))
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  {
    const Area area = tu.Y().valid() ? tu.Y() : Area(recalcPosition(tu.chromaFormat, tu.chType, CHANNEL_TYPE_LUMA, tu.blocks[tu.chType].pos()), recalcSize(tu.chromaFormat, tu.chType, CHANNEL_TYPE_LUMA, tu.blocks[tu.chType].size()));
    const CompArea &areaY = CompArea(COMPONENT_Y, tu.chromaFormat, area );
    PelBuf piPredY;
    piPredY = cs.picture->getPredBuf(areaY);
    const Pel avgLuma = piPredY.computeAvg();
    int adj = m_pcReshape->calculateChromaAdj(avgLuma);
    tu.setChromaAdj(adj);
  }
#endif
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  //===== get residual signal =====
  piResi.copyFrom( piOrg  );
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#if JVET_M0427_INLOOP_RESHAPER
  if (slice.getReshapeInfo().getUseSliceReshaper() && m_pcReshape->getCTUFlag() && compID==COMPONENT_Y)
  {
    CompArea      tmpArea(COMPONENT_Y, area.chromaFormat, Position(0, 0), area.size());
    PelBuf tmpPred = m_tmpStorageLCU.getBuf(tmpArea);
    tmpPred.copyFrom(piPred);
    piResi.rspSignal(m_pcReshape->getFwdLUT());
    piResi.subtract(tmpPred);
  }
  else
#endif
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  piResi.subtract( piPred );

  if (pps.getPpsRangeExtension().getCrossComponentPredictionEnabledFlag() && isLuma(compID))
  {
    piOrgResi.copyFrom (piResi);
  }

  if (bUseCrossCPrediction)
  {
    if (xCalcCrossComponentPredictionAlpha(tu, compID, ccUseRecoResi) == 0)
    {
      return;
    }
    CrossComponentPrediction::crossComponentPrediction(tu, compID, cs.getResiBuf(tu.Y()), piResi, piResi, false);
  }

  //===== transform and quantization =====
  //--- init rate estimation arrays for RDOQ ---
  //--- transform and quantization           ---
  TCoeff uiAbsSum = 0;

  const QpParam cQP(tu, compID);

#if RDOQ_CHROMA_LAMBDA
  m_pcTrQuant->selectLambda(compID);
#endif

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#if JVET_M0427_INLOOP_RESHAPER
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  flag =flag && (tu.blocks[compID].width*tu.blocks[compID].height > 4);
  if (flag && isChroma(compID) && slice.getReshapeInfo().getSliceReshapeChromaAdj() )
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  {
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    int cResScaleInv = tu.getChromaAdj();
    double cResScale = round((double)(1 << CSCALE_FP_PREC) / (double)cResScaleInv);
    m_pcTrQuant->setLambda(m_pcTrQuant->getLambda() / (cResScale*cResScale));
    piResi.scaleSignal(cResScaleInv, 1, tu.cu->cs->slice->clpRng(compID));
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  }
#endif 

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#if JVET_M0464_UNI_MTS
  if( trModes )
  {
    m_pcTrQuant->transformNxN( tu, compID, cQP, trModes, CU::isIntra( *tu.cu ) ? m_pcEncCfg->getIntraMTSMaxCand() : m_pcEncCfg->getInterMTSMaxCand() );
    tu.mtsIdx = trModes->at(0).first;
  }
  m_pcTrQuant->transformNxN(tu, compID, cQP, uiAbsSum, m_CABACEstimator->getCtx(), loadTr);
#else
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  m_pcTrQuant->transformNxN(tu, compID, cQP, uiAbsSum, m_CABACEstimator->getCtx());
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#endif
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  DTRACE( g_trace_ctx, D_TU_ABS_SUM, "%d: comp=%d, abssum=%d\n", DTRACE_GET_COUNTER( g_trace_ctx, D_TU_ABS_SUM ), compID, uiAbsSum );


  //--- inverse transform ---
  if (uiAbsSum > 0)
  {
    m_pcTrQuant->invTransformNxN(tu, compID, piResi, cQP);
  }
  else
  {
    piResi.fill(0);
  }

  //===== reconstruction =====
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#if JVET_M0427_INLOOP_RESHAPER
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  if (flag && uiAbsSum > 0 && isChroma(compID) && slice.getReshapeInfo().getSliceReshapeChromaAdj() )
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  {
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    piResi.scaleSignal(tu.getChromaAdj(), 0, tu.cu->cs->slice->clpRng(compID));
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  }
#endif
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  if (bUseCrossCPrediction)
  {
    CrossComponentPrediction::crossComponentPrediction(tu, compID, cs.getResiBuf(tu.Y()), piResi, piResi, true);
  }

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#if JVET_M0427_INLOOP_RESHAPER
  if (slice.getReshapeInfo().getUseSliceReshaper() && m_pcReshape->getCTUFlag() && compID == COMPONENT_Y)
  {
    CompArea      tmpArea(COMPONENT_Y, area.chromaFormat, Position(0,0), area.size());
    PelBuf tmpPred = m_tmpStorageLCU.getBuf(tmpArea);
    tmpPred.copyFrom(piPred);
    piReco.reconstruct(tmpPred, piResi, cs.slice->clpRng(compID));
  }
  else 
#endif
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  piReco.reconstruct(piPred, piResi, cs.slice->clpRng( compID ));

  //===== update distortion =====
#if WCG_EXT
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#if JVET_M0427_INLOOP_RESHAPER
  if (m_pcEncCfg->getLumaLevelToDeltaQPMapping().isEnabled() || (m_pcEncCfg->getReshaper()
    && slice.getReshapeInfo().getUseSliceReshaper() && (m_pcReshape->getCTUFlag() || (isChroma(compID) && m_pcEncCfg->getReshapeIntraCMD()))))
#else
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  if( m_pcEncCfg->getLumaLevelToDeltaQPMapping().isEnabled() )
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#endif
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  {
    const CPelBuf orgLuma = cs.getOrgBuf( cs.area.blocks[COMPONENT_Y] );
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#if JVET_M0427_INLOOP_RESHAPER
    if (compID == COMPONENT_Y)
    {
      CompArea      tmpArea1(COMPONENT_Y, area.chromaFormat, Position(0, 0), area.size());
      PelBuf tmpRecLuma = m_tmpStorageLCU.getBuf(tmpArea1);
      tmpRecLuma.copyFrom(piReco);
      tmpRecLuma.rspSignal(m_pcReshape->getInvLUT());
      ruiDist += m_pcRdCost->getDistPart(piOrg, tmpRecLuma, sps.getBitDepth(toChannelType(compID)), compID, DF_SSE_WTD, &orgLuma);
    }
    else
#endif
      ruiDist += m_pcRdCost->getDistPart(piOrg, piReco, bitDepth, compID, DF_SSE_WTD, &orgLuma);
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  }
  else
#endif
  {
    ruiDist += m_pcRdCost->getDistPart( piOrg, piReco, bitDepth, compID, DF_SSE );
  }
}

void IntraSearch::xRecurIntraCodingLumaQT( CodingStructure &cs, Partitioner &partitioner )
{
  const UnitArea &currArea = partitioner.currArea();
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#if !JVET_M0464_UNI_MTS
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  const CodingUnit &cu     = *cs.getCU(currArea.lumaPos(), partitioner.chType);
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#endif
  uint32_t currDepth       = partitioner.currTrDepth;
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  const PPS &pps           = *cs.pps;
  const bool keepResi      = pps.getPpsRangeExtension().getCrossComponentPredictionEnabledFlag() || KEEP_PRED_AND_RESI_SIGNALS;
  bool bCheckFull          = true;
  bool bCheckSplit         = false;
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  bCheckFull               = !partitioner.canSplit( TU_MAX_TR_SPLIT, cs );
  bCheckSplit              = partitioner.canSplit( TU_MAX_TR_SPLIT, cs );
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  uint32_t    numSig           = 0;

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#if JVET_M0464_UNI_MTS
  double     dSingleCost                        = MAX_DOUBLE;
  Distortion uiSingleDistLuma                   = 0;
  uint64_t   singleFracBits                     = 0;
  int        bestModeId[MAX_NUM_COMPONENT]      = { 0, 0, 0 };
#else
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  bool    checkInitTrDepth = false, checkInitTrDepthTransformSkipWinner = false;

  double     dSingleCost                        = MAX_DOUBLE;
  Distortion uiSingleDistLuma                   = 0;
  uint64_t     singleFracBits                     = 0;
  bool       checkTransformSkip                 = pps.getUseTransformSkip();
  int        bestModeId[MAX_NUM_COMPONENT]      = {0, 0, 0};
  uint8_t      nNumTransformCands                 = cu.emtFlag ? 4 : 1; //4 is the number of transforms of emt
  bool       isAllIntra                         = m_pcEncCfg->getIntraPeriod() == 1;

  uint8_t numTransformIndexCands                  = nNumTransformCands;
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#endif
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  const TempCtx ctxStart  ( m_CtxCache, m_CABACEstimator->getCtx() );
  TempCtx       ctxBest   ( m_CtxCache );

  CodingStructure *csSplit = nullptr;
  CodingStructure *csFull  = nullptr;

  if( bCheckSplit )
  {
    csSplit = &cs;
  }
  else if( bCheckFull )
  {
    csFull = &cs;
  }

  if( bCheckFull )
  {
    csFull->cost = 0.0;

    TransformUnit &tu = csFull->addTU( CS::getArea( *csFull, currArea, partitioner.chType ), partitioner.chType );
    tu.depth = currDepth;

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#if JVET_M0464_UNI_MTS
    const bool tsAllowed  = TU::isTSAllowed ( tu, COMPONENT_Y );
    const bool mtsAllowed = TU::isMTSAllowed( tu, COMPONENT_Y );
    uint8_t nNumTransformCands = 1 + ( tsAllowed ? 1 : 0 ) + ( mtsAllowed ? 4 : 0 ); // DCT + TS + 4 MTS = 6 tests
    std::vector<TrMode> trModes;
    trModes.push_back( TrMode( 0, true ) ); //DCT2
    if( tsAllowed )
    {
      trModes.push_back( TrMode( 1, true ) );
    }
    if( mtsAllowed )
    {
      for( int i = 2; i < 6; i++ )
      {
        trModes.push_back( TrMode( i, true) );
      }
    }

    CHECK( !tu.Y().valid(), "Invalid TU" );
#else
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    checkTransformSkip &= TU::hasTransformSkipFlag( *tu.cs, tu.Y() );
    checkTransformSkip &= !cu.transQuantBypass;
    checkTransformSkip &= !cu.emtFlag;

    CHECK( !tu.Y().valid(), "Invalid TU" );

    //this prevents transformSkip from being checked because we already know it's not the best mode
    checkTransformSkip = ( checkInitTrDepth && !checkInitTrDepthTransformSkipWinner ) ? false : checkTransformSkip;


    CHECK( checkInitTrDepthTransformSkipWinner && !checkTransformSkip, "Transform Skip must be enabled if it was the winner in the previous call of xRecurIntraCodingLumaQT!" );
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#endif
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    CodingStructure &saveCS = *m_pSaveCS[0];

    TransformUnit *tmpTU = nullptr;

    Distortion singleDistTmpLuma = 0;
    uint64_t     singleTmpFracBits = 0;
    double     singleCostTmp     = 0;
    int        firstCheckId      = 0;

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#if JVET_M0464_UNI_MTS
    int       lastCheckId        = trModes[nNumTransformCands-1].first;
    bool isNotOnlyOneMode        = nNumTransformCands != 1;
#else
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    //we add the EMT candidates to the loop. TransformSkip will still be the last one to be checked (when modeId == lastCheckId) as long as checkTransformSkip is true
    int        lastCheckId       = numTransformIndexCands - ( firstCheckId + 1 ) + ( int ) checkTransformSkip;
    bool isNotOnlyOneMode        = lastCheckId != firstCheckId && !checkInitTrDepthTransformSkipWinner;
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#endif
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    if( isNotOnlyOneMode )
    {
      saveCS.pcv     = cs.pcv;
      saveCS.picture = cs.picture;
      saveCS.area.repositionTo(cs.area);
      saveCS.clearTUs();
      tmpTU = &saveCS.addTU(currArea, partitioner.chType);
    }

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#if JVET_M0464_UNI_MTS
    bool    cbfDCT2  = true;
#else
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    bool cbfBestMode = false;
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#endif
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#if JVET_M0464_UNI_MTS
    for( int modeId = firstCheckId; modeId < nNumTransformCands; modeId++ )
    {
      if( !cbfDCT2 || ( m_pcEncCfg->getUseTransformSkipFast() && bestModeId[COMPONENT_Y] == 1 ) )
      {
        break;
      }
      if( !trModes[modeId].second )
      {
        continue;
      }
      tu.mtsIdx = trModes[modeId].first;
#else
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    for( int modeId = firstCheckId; modeId <= lastCheckId; modeId++ )
    {
      if( checkInitTrDepthTransformSkipWinner )
      {
        //If this is a full RQT call and the winner of the first call (checkFirst=true) was transformSkip, then we skip the first iteration of the loop, since transform skip always comes at the end
        if( modeId == firstCheckId )
        {
          continue;
        }
      }

      uint8_t transformIndex = modeId;


      if( ( transformIndex < lastCheckId ) || ( ( transformIndex == lastCheckId ) && !checkTransformSkip ) ) //we avoid this if the mode is transformSkip
      {
        // Skip checking other transform candidates if zero CBF is encountered and it is the best transform so far
        if( m_pcEncCfg->getFastIntraEMT() && isAllIntra && transformIndex && !cbfBestMode )
        {
          continue;
        }
      }
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#endif
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      if ((modeId != firstCheckId) && isNotOnlyOneMode)
      {
        m_CABACEstimator->getCtx() = ctxStart;
      }

      int default0Save1Load2 = 0;
      singleDistTmpLuma = 0;

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#if JVET_M0464_UNI_MTS
      if( modeId == firstCheckId && nNumTransformCands > 1 )
#else
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      if (modeId == firstCheckId && modeId != lastCheckId && !checkInitTrDepthTransformSkipWinner )
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#endif
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      {
        default0Save1Load2 = 1;
      }
      else if (modeId != firstCheckId)
      {
        default0Save1Load2 = 2;
      }
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#if JVET_M0464_UNI_MTS
      if( nNumTransformCands > 1 )
      {
        xIntraCodingTUBlock( tu, COMPONENT_Y, false, singleDistTmpLuma, default0Save1Load2, &numSig, modeId == 0 ? &trModes : nullptr, true );
        if( modeId == 0 )
        {
          for( int i = 0; i < nNumTransformCands; i++ )
          {
            if( trModes[i].second )
            {
              lastCheckId = trModes[i].first;
            }
          }
        }
      }
      else
      {
        xIntraCodingTUBlock( tu, COMPONENT_Y, false, singleDistTmpLuma, default0Save1Load2, &numSig );
      }
#else
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      if (cu.emtFlag)
      {
        tu.emtIdx = transformIndex;
      }
      if( !checkTransformSkip )
      {
        tu.transformSkip[COMPONENT_Y] = false;
      }
      else
      {
        tu.transformSkip[COMPONENT_Y] = modeId == lastCheckId;
      }

      xIntraCodingTUBlock( tu, COMPONENT_Y, false, singleDistTmpLuma, default0Save1Load2, &numSig );
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#endif
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      //----- determine rate and r-d cost -----
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#if JVET_M0464_UNI_MTS
      if( ( trModes[modeId].first != 0 && !TU::getCbfAtDepth( tu, COMPONENT_Y, currDepth ) ) )
#else
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      //the condition (transformIndex != DCT2_EMT) seems to be irrelevant, since DCT2_EMT=7 and the highest value of transformIndex is 4
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      if( ( modeId == lastCheckId && checkTransformSkip && !TU::getCbfAtDepth( tu, COMPONENT_Y, currDepth ) ) )
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#endif
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      {
        //In order not to code TS flag when cbf is zero, the case for TS with cbf being zero is forbidden.
        singleCostTmp = MAX_DOUBLE;
      }
      else
      {
        singleTmpFracBits = xGetIntraFracBitsQT( *csFull, partitioner, true, false );
        singleCostTmp     = m_pcRdCost->calcRdCost( singleTmpFracBits, singleDistTmpLuma );
      }

      if (singleCostTmp < dSingleCost)
      {
        dSingleCost       = singleCostTmp;
        uiSingleDistLuma  = singleDistTmpLuma;
        singleFracBits    = singleTmpFracBits;

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#if JVET_M0464_UNI_MTS
        bestModeId[COMPONENT_Y] = trModes[modeId].first;
        if( trModes[modeId].first == 0 )
        {
          cbfDCT2  = TU::getCbfAtDepth( tu, COMPONENT_Y, currDepth );
        }
#else
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        bestModeId[COMPONENT_Y] = modeId;
        cbfBestMode       = TU::getCbfAtDepth( tu, COMPONENT_Y, currDepth );
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#endif
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        if( bestModeId[COMPONENT_Y] != lastCheckId )
        {
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#if KEEP_PRED_AND_RESI_SIGNALS || JVET_M0427_INLOOP_RESHAPER
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          saveCS.getPredBuf( tu.Y() ).copyFrom( csFull->getPredBuf( tu.Y() ) );
#endif
          saveCS.getRecoBuf( tu.Y() ).copyFrom( csFull->getRecoBuf( tu.Y() ) );

          if( keepResi )
          {
            saveCS.getResiBuf   ( tu.Y() ).copyFrom( csFull->getResiBuf   ( tu.Y() ) );
            saveCS.getOrgResiBuf( tu.Y() ).copyFrom( csFull->getOrgResiBuf( tu.Y() ) );
          }

          tmpTU->copyComponentFrom( tu, COMPONENT_Y );

          ctxBest = m_CABACEstimator->getCtx();
        }
      }
    }

    if( bestModeId[COMPONENT_Y] != lastCheckId )
    {
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#if KEEP_PRED_AND_RESI_SIGNALS || JVET_M0427_INLOOP_RESHAPER
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