InterPrediction.cpp

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/** \file     Prediction.cpp
    \brief    prediction class
*/

#include "InterPrediction.h"

#include "Buffer.h"
#include "UnitTools.h"

#include <memory.h>
#include <algorithm>

//! \ingroup CommonLib
//! \{

// ====================================================================================================================
// Constructor / destructor / initialize
// ====================================================================================================================

InterPrediction::InterPrediction()
:
  m_currChromaFormat( NUM_CHROMA_FORMAT )
, m_maxCompIDToPred ( MAX_NUM_COMPONENT )
, m_pcRdCost        ( nullptr )
, m_storedMv        ( nullptr )
, m_gradX0(nullptr)
, m_gradY0(nullptr)
, m_gradX1(nullptr)
, m_gradY1(nullptr)
, m_subPuMC(false)
{
  for( uint32_t ch = 0; ch < MAX_NUM_COMPONENT; ch++ )
  {
    for( uint32_t refList = 0; refList < NUM_REF_PIC_LIST_01; refList++ )
    {
      m_acYuvPred[refList][ch] = nullptr;
    }
  }

  for( uint32_t c = 0; c < MAX_NUM_COMPONENT; c++ )
  {
    for( uint32_t i = 0; i < LUMA_INTERPOLATION_FILTER_SUB_SAMPLE_POSITIONS_SIGNAL; i++ )
    {
      for( uint32_t j = 0; j < LUMA_INTERPOLATION_FILTER_SUB_SAMPLE_POSITIONS_SIGNAL; j++ )
      {
        m_filteredBlock[i][j][c] = nullptr;
      }

      m_filteredBlockTmp[i][c] = nullptr;
    }
  }
#if JVET_M0147_DMVR
  m_cYuvPredTempDMVRL1 = nullptr;
  m_cYuvPredTempDMVRL0 = nullptr;
  for (uint32_t ch = 0; ch < MAX_NUM_COMPONENT; ch++)
  {
    m_cRefSamplesDMVRL0[ch] = nullptr;
    m_cRefSamplesDMVRL1[ch] = nullptr;
  }
#endif
}

InterPrediction::~InterPrediction()
{
  destroy();
}

void InterPrediction::destroy()
{
  for( uint32_t i = 0; i < NUM_REF_PIC_LIST_01; i++ )
  {
    for( uint32_t c = 0; c < MAX_NUM_COMPONENT; c++ )
    {
      xFree( m_acYuvPred[i][c] );
      m_acYuvPred[i][c] = nullptr;
    }
  }

  for( uint32_t c = 0; c < MAX_NUM_COMPONENT; c++ )
  {
    for( uint32_t i = 0; i < LUMA_INTERPOLATION_FILTER_SUB_SAMPLE_POSITIONS_SIGNAL; i++ )
    {
      for( uint32_t j = 0; j < LUMA_INTERPOLATION_FILTER_SUB_SAMPLE_POSITIONS_SIGNAL; j++ )
      {
        xFree( m_filteredBlock[i][j][c] );
        m_filteredBlock[i][j][c] = nullptr;
      }

      xFree( m_filteredBlockTmp[i][c] );
      m_filteredBlockTmp[i][c] = nullptr;
    }
  }

  m_triangleBuf.destroy();

  if (m_storedMv != nullptr)
  {
    delete[]m_storedMv;
    m_storedMv = nullptr;
  }

  xFree(m_gradX0);   m_gradX0 = nullptr;
  xFree(m_gradY0);   m_gradY0 = nullptr;
  xFree(m_gradX1);   m_gradX1 = nullptr;
  xFree(m_gradY1);   m_gradY1 = nullptr;
#if JVET_M0147_DMVR
  xFree(m_cYuvPredTempDMVRL0);
  m_cYuvPredTempDMVRL0 = nullptr;
  xFree(m_cYuvPredTempDMVRL1);
  m_cYuvPredTempDMVRL1 = nullptr;
  for (uint32_t ch = 0; ch < MAX_NUM_COMPONENT; ch++)
  {
    xFree(m_cRefSamplesDMVRL0[ch]);
    m_cRefSamplesDMVRL0[ch] = nullptr;
    xFree(m_cRefSamplesDMVRL1[ch]);
    m_cRefSamplesDMVRL1[ch] = nullptr;
  }
#endif
}

void InterPrediction::init( RdCost* pcRdCost, ChromaFormat chromaFormatIDC )
{
  m_pcRdCost = pcRdCost;


  // if it has been initialised before, but the chroma format has changed, release the memory and start again.
  if( m_acYuvPred[REF_PIC_LIST_0][COMPONENT_Y] != nullptr && m_currChromaFormat != chromaFormatIDC )
  {
    destroy();
  }

  m_currChromaFormat = chromaFormatIDC;
  if( m_acYuvPred[REF_PIC_LIST_0][COMPONENT_Y] == nullptr ) // check if first is null (in which case, nothing initialised yet)
  {
    for( uint32_t c = 0; c < MAX_NUM_COMPONENT; c++ )
    {
      int extWidth = MAX_CU_SIZE + (2 * BIO_EXTEND_SIZE + 2) + 16;
      int extHeight = MAX_CU_SIZE + (2 * BIO_EXTEND_SIZE + 2) + 1;
#if JVET_M0147_DMVR
      extWidth = extWidth > (MAX_CU_SIZE + (DMVR_NUM_ITERATION << 1) + 16) ? extWidth : MAX_CU_SIZE + (DMVR_NUM_ITERATION << 1) + 16;
      extHeight = extHeight > (MAX_CU_SIZE + (DMVR_NUM_ITERATION << 1) + 1) ? extHeight : MAX_CU_SIZE + (DMVR_NUM_ITERATION << 1) + 1;
#endif
      for( uint32_t i = 0; i < LUMA_INTERPOLATION_FILTER_SUB_SAMPLE_POSITIONS_SIGNAL; i++ )
      {
        m_filteredBlockTmp[i][c] = ( Pel* ) xMalloc( Pel, ( extWidth + 4 ) * ( extHeight + 7 + 4 ) );

        for( uint32_t j = 0; j < LUMA_INTERPOLATION_FILTER_SUB_SAMPLE_POSITIONS_SIGNAL; j++ )
        {
          m_filteredBlock[i][j][c] = ( Pel* ) xMalloc( Pel, extWidth * extHeight );
        }
      }

      // new structure
      for( uint32_t i = 0; i < NUM_REF_PIC_LIST_01; i++ )
      {
        m_acYuvPred[i][c] = ( Pel* ) xMalloc( Pel, MAX_CU_SIZE * MAX_CU_SIZE );
      }
    }

    m_triangleBuf.create(UnitArea(chromaFormatIDC, Area(0, 0, MAX_CU_SIZE, MAX_CU_SIZE)));

    m_iRefListIdx = -1;
  
    m_gradX0 = (Pel*)xMalloc(Pel, BIO_TEMP_BUFFER_SIZE);
    m_gradY0 = (Pel*)xMalloc(Pel, BIO_TEMP_BUFFER_SIZE);
    m_gradX1 = (Pel*)xMalloc(Pel, BIO_TEMP_BUFFER_SIZE);
    m_gradY1 = (Pel*)xMalloc(Pel, BIO_TEMP_BUFFER_SIZE);
  }

#if JVET_M0147_DMVR
  m_cYuvPredTempDMVRL0 = (Pel*)xMalloc(Pel, (MAX_CU_SIZE + (DMVR_NUM_ITERATION << 1)) * (MAX_CU_SIZE + (DMVR_NUM_ITERATION << 1)));
  m_cYuvPredTempDMVRL1 = (Pel*)xMalloc(Pel, (MAX_CU_SIZE + (DMVR_NUM_ITERATION << 1)) * (MAX_CU_SIZE + (DMVR_NUM_ITERATION << 1)));
  for (uint32_t ch = 0; ch < MAX_NUM_COMPONENT; ch++)
  {    
    m_cRefSamplesDMVRL0[ch] = (Pel*)xMalloc(Pel, (MAX_CU_SIZE + (DMVR_NUM_ITERATION << 1) + NTAPS_LUMA) * (MAX_CU_SIZE + (DMVR_NUM_ITERATION << 1) + NTAPS_LUMA));
    m_cRefSamplesDMVRL1[ch] = (Pel*)xMalloc(Pel, (MAX_CU_SIZE + (DMVR_NUM_ITERATION << 1) + NTAPS_LUMA) * (MAX_CU_SIZE + (DMVR_NUM_ITERATION << 1) + NTAPS_LUMA));
  }
#endif
#if !JVET_J0090_MEMORY_BANDWITH_MEASURE
  m_if.initInterpolationFilter( true );
#endif

  if (m_storedMv == nullptr)
  {
    const int MVBUFFER_SIZE = MAX_CU_SIZE / MIN_PU_SIZE;
    m_storedMv = new Mv[MVBUFFER_SIZE*MVBUFFER_SIZE];
  }
}

bool checkIdenticalMotion( const PredictionUnit &pu, bool checkAffine )
{
  const Slice &slice = *pu.cs->slice;

  if( slice.isInterB() && !pu.cs->pps->getWPBiPred() )
  {
    if( pu.refIdx[0] >= 0 && pu.refIdx[1] >= 0 )
    {
      int RefPOCL0 = slice.getRefPic( REF_PIC_LIST_0, pu.refIdx[0] )->getPOC();
      int RefPOCL1 = slice.getRefPic( REF_PIC_LIST_1, pu.refIdx[1] )->getPOC();

      if( RefPOCL0 == RefPOCL1 )
      {
        if( !pu.cu->affine )
        {
          if( pu.mv[0] == pu.mv[1] )
          {
            return true;
          }
        }
        else
        {
          CHECK( !checkAffine, "In this case, checkAffine should be on." );
          if ( (pu.cu->affineType == AFFINEMODEL_4PARAM && (pu.mvAffi[0][0] == pu.mvAffi[1][0]) && (pu.mvAffi[0][1] == pu.mvAffi[1][1]))
            || (pu.cu->affineType == AFFINEMODEL_6PARAM && (pu.mvAffi[0][0] == pu.mvAffi[1][0]) && (pu.mvAffi[0][1] == pu.mvAffi[1][1]) && (pu.mvAffi[0][2] == pu.mvAffi[1][2])) )
          {
            return true;
          }
        }
      }
    }
  }

  return false;
}

// ====================================================================================================================
// Public member functions
// ====================================================================================================================

bool InterPrediction::xCheckIdenticalMotion( const PredictionUnit &pu )
{
  const Slice &slice = *pu.cs->slice;

  if( slice.isInterB() && !pu.cs->pps->getWPBiPred() )
  {
    if( pu.refIdx[0] >= 0 && pu.refIdx[1] >= 0 )
    {
      int RefPOCL0 = slice.getRefPic( REF_PIC_LIST_0, pu.refIdx[0] )->getPOC();
      int RefPOCL1 = slice.getRefPic( REF_PIC_LIST_1, pu.refIdx[1] )->getPOC();

      if( RefPOCL0 == RefPOCL1 )
      {
        if( !pu.cu->affine )
        {
          if( pu.mv[0] == pu.mv[1] )
          {
            return true;
          }
        }
        else
        {
          if ( (pu.cu->affineType == AFFINEMODEL_4PARAM && (pu.mvAffi[0][0] == pu.mvAffi[1][0]) && (pu.mvAffi[0][1] == pu.mvAffi[1][1]))
            || (pu.cu->affineType == AFFINEMODEL_6PARAM && (pu.mvAffi[0][0] == pu.mvAffi[1][0]) && (pu.mvAffi[0][1] == pu.mvAffi[1][1]) && (pu.mvAffi[0][2] == pu.mvAffi[1][2])) )
          {
            return true;
          }
        }
      }
    }
  }

  return false;
}

void InterPrediction::xSubPuMC( PredictionUnit& pu, PelUnitBuf& predBuf, const RefPicList &eRefPicList /*= REF_PIC_LIST_X*/ )
{

  // compute the location of the current PU
  Position puPos    = pu.lumaPos();
  Size puSize       = pu.lumaSize();

  int numPartLine, numPartCol, puHeight, puWidth;
  {
    numPartLine = std::max(puSize.width >> ATMVP_SUB_BLOCK_SIZE, 1u);
    numPartCol = std::max(puSize.height >> ATMVP_SUB_BLOCK_SIZE, 1u);
    puHeight = numPartCol == 1 ? puSize.height : 1 << ATMVP_SUB_BLOCK_SIZE;
    puWidth = numPartLine == 1 ? puSize.width : 1 << ATMVP_SUB_BLOCK_SIZE;
  }

  PredictionUnit subPu;

  subPu.cs        = pu.cs;
  subPu.cu        = pu.cu;
  subPu.mergeType = MRG_TYPE_DEFAULT_N;

  bool isAffine = pu.cu->affine;
  subPu.cu->affine = false;

  // join sub-pus containing the same motion
  bool verMC = puSize.height > puSize.width;
  int  fstStart = (!verMC ? puPos.y : puPos.x);
  int  secStart = (!verMC ? puPos.x : puPos.y);
  int  fstEnd = (!verMC ? puPos.y + puSize.height : puPos.x + puSize.width);
  int  secEnd = (!verMC ? puPos.x + puSize.width : puPos.y + puSize.height);
  int  fstStep = (!verMC ? puHeight : puWidth);
  int  secStep = (!verMC ? puWidth : puHeight);

  m_subPuMC = true;

  for (int fstDim = fstStart; fstDim < fstEnd; fstDim += fstStep)
  {
    for (int secDim = secStart; secDim < secEnd; secDim += secStep)
    {
      int x = !verMC ? secDim : fstDim;
      int y = !verMC ? fstDim : secDim;
      const MotionInfo &curMi = pu.getMotionInfo(Position{ x, y });

      int length = secStep;
      int later  = secDim + secStep;

      while (later < secEnd)
      {
        const MotionInfo &laterMi = !verMC ? pu.getMotionInfo(Position{ later, fstDim }) : pu.getMotionInfo(Position{ fstDim, later });
        if (laterMi == curMi)
        {
          length += secStep;
        }
        else
        {
          break;
        }
        later += secStep;
      }
      int dx = !verMC ? length : puWidth;
      int dy = !verMC ? puHeight : length;

      subPu.UnitArea::operator=(UnitArea(pu.chromaFormat, Area(x, y, dx, dy)));
      subPu = curMi;
      PelUnitBuf subPredBuf = predBuf.subBuf(UnitAreaRelative(pu, subPu));
#if JVET_M0823_MMVD_ENCOPT
      subPu.mmvdEncOptMode = 0;
#endif
#if JVET_M0147_DMVR
      subPu.mvRefine = false;
#endif
      motionCompensation(subPu, subPredBuf, eRefPicList);
      secDim = later - secStep;
    }
  }
  m_subPuMC = false;

  pu.cu->affine = isAffine;
}

void InterPrediction::xChromaMC(PredictionUnit &pu, PelUnitBuf& pcYuvPred)
{
  // separated tree, chroma
  const CompArea lumaArea = CompArea(COMPONENT_Y, pu.chromaFormat, pu.Cb().lumaPos(), recalcSize(pu.chromaFormat, CHANNEL_TYPE_CHROMA, CHANNEL_TYPE_LUMA, pu.Cb().size()));
  PredictionUnit subPu;
  subPu.cs = pu.cs;
  subPu.cu = pu.cu;

  Picture * refPic = pu.cu->slice->getPic();
  for (int y = lumaArea.y; y < lumaArea.y + lumaArea.height; y += MIN_PU_SIZE)
  {
    for (int x = lumaArea.x; x < lumaArea.x + lumaArea.width; x += MIN_PU_SIZE)
    {
      const MotionInfo &curMi = pu.cs->picture->cs->getMotionInfo(Position{ x, y });

      subPu.UnitArea::operator=(UnitArea(pu.chromaFormat, Area(x, y, MIN_PU_SIZE, MIN_PU_SIZE)));
      PelUnitBuf subPredBuf = pcYuvPred.subBuf(UnitAreaRelative(pu, subPu));

      xPredInterBlk(COMPONENT_Cb, subPu, refPic, curMi.mv[0], subPredBuf, false, pu.cu->slice->clpRng(COMPONENT_Cb)
                    , false
                    , true);
      xPredInterBlk(COMPONENT_Cr, subPu, refPic, curMi.mv[0], subPredBuf, false, pu.cu->slice->clpRng(COMPONENT_Cr)
                    , false
                    , true);
    }
  }
}


void InterPrediction::xPredInterUni(const PredictionUnit& pu, const RefPicList& eRefPicList, PelUnitBuf& pcYuvPred, const bool& bi 
                                   , const bool& bioApplied 
                                   , const bool luma, const bool chroma
)
{
  const SPS &sps = *pu.cs->sps;

  int iRefIdx = pu.refIdx[eRefPicList];
  Mv mv[3];
  bool isIBC = false;
  if (pu.cs->slice->getRefPic(eRefPicList, iRefIdx)->getPOC() == pu.cs->slice->getPOC())
  {
    isIBC = true;
  }
  if( pu.cu->affine )
  {
    CHECK( iRefIdx < 0, "iRefIdx incorrect." );

    mv[0] = pu.mvAffi[eRefPicList][0];
    mv[1] = pu.mvAffi[eRefPicList][1];
    mv[2] = pu.mvAffi[eRefPicList][2];
  }
  else
  {
    mv[0] = pu.mv[eRefPicList];
  }
  if ( !pu.cu->affine )
  clipMv(mv[0], pu.cu->lumaPos(),
         pu.cu->lumaSize(),
         sps);

#if JVET_M0823_MMVD_ENCOPT
  int numOfPass = (pu.mmvdMergeFlag && pu.mmvdEncOptMode) ? 1 : (std::min((int)pcYuvPred.bufs.size(), m_maxCompIDToPred + 1));
  for (uint32_t comp = COMPONENT_Y; comp < numOfPass; comp++)
#else
  for( uint32_t comp = COMPONENT_Y; comp < pcYuvPred.bufs.size() && comp <= m_maxCompIDToPred; comp++ )
#endif
  {
    const ComponentID compID = ComponentID( comp );
    if (compID == COMPONENT_Y && !luma)
      continue;
    if (compID != COMPONENT_Y && !chroma)
      continue;
    if ( pu.cu->affine )
    {
      CHECK( bioApplied, "BIO is not allowed with affine" );
      xPredAffineBlk( compID, pu, pu.cu->slice->getRefPic( eRefPicList, iRefIdx ), mv, pcYuvPred, bi, pu.cu->slice->clpRng( compID ) );
    }
    else
    {
      xPredInterBlk( compID, pu, pu.cu->slice->getRefPic( eRefPicList, iRefIdx ), mv[0], pcYuvPred, bi, pu.cu->slice->clpRng( compID )
                    , bioApplied
                    , isIBC
                    );

    }
  }
}

void InterPrediction::xPredInterBi(PredictionUnit& pu, PelUnitBuf &pcYuvPred)
{
  const PPS   &pps   = *pu.cs->pps;
  const Slice &slice = *pu.cs->slice;

  bool bioApplied = false;
  if (pu.cs->sps->getBDOFEnabledFlag())
  {
    if (pu.cu->affine || m_subPuMC)
    {
      bioApplied = false;
    }
    else
    {
      const bool biocheck0 = !(pps.getWPBiPred() && slice.getSliceType() == B_SLICE);
      const bool biocheck1 = !(pps.getUseWP() && slice.getSliceType() == P_SLICE);
      if (biocheck0
        && biocheck1
        && PU::isBiPredFromDifferentDir(pu)
        && !(pu.Y().height == 4 || (pu.Y().width == 4 && pu.Y().height == 8))
       )
      {
        bioApplied = true;
      }
    }

#if JVET_M0444_SMVD
    if (bioApplied && pu.cu->smvdMode)
    {
      bioApplied = false;
    }
#endif

    if (pu.cu->cs->sps->getSpsNext().getUseGBi() && bioApplied && pu.cu->GBiIdx != GBI_DEFAULT)
    {
      bioApplied = false;
    }
  }
#if JVET_M0823_MMVD_ENCOPT
  if (pu.mmvdEncOptMode == 2 && pu.mmvdMergeFlag) {
    bioApplied = false;
  }
#endif
#if JVET_M0147_DMVR
  bool bDMVRApplied = false;
  bDMVRApplied = (pu.mvRefine) && PU::checkDMVRCondition(pu);
#endif
  for (uint32_t refList = 0; refList < NUM_REF_PIC_LIST_01; refList++)
  {
    if( pu.refIdx[refList] < 0)
    {
      continue;
    }

    RefPicList eRefPicList = (refList ? REF_PIC_LIST_1 : REF_PIC_LIST_0);

    CHECK( pu.refIdx[refList] >= slice.getNumRefIdx( eRefPicList ), "Invalid reference index" );
    m_iRefListIdx = refList;

    PelUnitBuf pcMbBuf = ( pu.chromaFormat == CHROMA_400 ?
                           PelUnitBuf(pu.chromaFormat, PelBuf(m_acYuvPred[refList][0], pcYuvPred.Y())) :
                           PelUnitBuf(pu.chromaFormat, PelBuf(m_acYuvPred[refList][0], pcYuvPred.Y()), PelBuf(m_acYuvPred[refList][1], pcYuvPred.Cb()), PelBuf(m_acYuvPred[refList][2], pcYuvPred.Cr())) );

    if (pu.refIdx[0] >= 0 && pu.refIdx[1] >= 0)
    {
#if JVET_M0147_DMVR
      if (bDMVRApplied)
        continue; // mc will happen in processDMVR
#endif
      xPredInterUni ( pu, eRefPicList, pcMbBuf, true
        , bioApplied
        , true, true
      );
    }
    else
    {
      if( ( (pps.getUseWP() && slice.getSliceType() == P_SLICE) || (pps.getWPBiPred() && slice.getSliceType() == B_SLICE) ) )
      {
        xPredInterUni ( pu, eRefPicList, pcMbBuf, true 
          , bioApplied
          , true, true
        );
      }
      else
      {
        xPredInterUni( pu, eRefPicList, pcMbBuf, pu.cu->triangle 
          , bioApplied
          , true, true
        );
      }
    }
  }
#if JVET_M0147_DMVR
  if (bDMVRApplied)
  {
    xProcessDMVR(pu, pcYuvPred, slice.clpRngs(), bioApplied);
  }
#endif


  CPelUnitBuf srcPred0 = ( pu.chromaFormat == CHROMA_400 ?
                           CPelUnitBuf(pu.chromaFormat, PelBuf(m_acYuvPred[0][0], pcYuvPred.Y())) :
                           CPelUnitBuf(pu.chromaFormat, PelBuf(m_acYuvPred[0][0], pcYuvPred.Y()), PelBuf(m_acYuvPred[0][1], pcYuvPred.Cb()), PelBuf(m_acYuvPred[0][2], pcYuvPred.Cr())) );
  CPelUnitBuf srcPred1 = ( pu.chromaFormat == CHROMA_400 ?
                           CPelUnitBuf(pu.chromaFormat, PelBuf(m_acYuvPred[1][0], pcYuvPred.Y())) :
                           CPelUnitBuf(pu.chromaFormat, PelBuf(m_acYuvPred[1][0], pcYuvPred.Y()), PelBuf(m_acYuvPred[1][1], pcYuvPred.Cb()), PelBuf(m_acYuvPred[1][2], pcYuvPred.Cr())) );
  if( pps.getWPBiPred() && slice.getSliceType() == B_SLICE )
  {
    xWeightedPredictionBi( pu, srcPred0, srcPred1, pcYuvPred, m_maxCompIDToPred );
  }
  else if( pps.getUseWP() && slice.getSliceType() == P_SLICE )
  {
    xWeightedPredictionUni( pu, srcPred0, REF_PIC_LIST_0, pcYuvPred, -1, m_maxCompIDToPred );
  }
  else
  {
#if JVET_M0147_DMVR
    if (bDMVRApplied == false)
    {
#endif
    xWeightedAverage( pu, srcPred0, srcPred1, pcYuvPred, slice.getSPS()->getBitDepths(), slice.clpRngs(), bioApplied );
#if JVET_M0147_DMVR
    }
#endif
  }
}

#if JVET_M0147_DMVR
void InterPrediction::xPredInterBlk ( const ComponentID& compID, const PredictionUnit& pu, const Picture* refPic, const Mv& _mv, PelUnitBuf& dstPic, const bool& bi, const ClpRng& clpRng
                                     , const bool& bioApplied
                                     , bool isIBC
                                     , SizeType dmvrWidth
                                     , SizeType dmvrHeight
                                     , bool bilinearMC
                                     , Pel *srcPadBuf
                                     , int32_t srcPadStride
                                    )
#else
void InterPrediction::xPredInterBlk ( const ComponentID& compID, const PredictionUnit& pu, const Picture* refPic, const Mv& _mv, PelUnitBuf& dstPic, const bool& bi, const ClpRng& clpRng
                                     , const bool& bioApplied
                                     , bool isIBC
                                    )
#endif
{
  JVET_J0090_SET_REF_PICTURE( refPic, compID );
  const ChromaFormat  chFmt = pu.chromaFormat;
  const bool          rndRes = !bi;

  int shiftHor = MV_FRACTIONAL_BITS_INTERNAL + ::getComponentScaleX(compID, chFmt);
  int shiftVer = MV_FRACTIONAL_BITS_INTERNAL + ::getComponentScaleY(compID, chFmt);

  int xFrac = _mv.hor & ((1 << shiftHor) - 1);
  int yFrac = _mv.ver & ((1 << shiftVer) - 1);
  if (isIBC)
  {
    xFrac = yFrac = 0;
    JVET_J0090_SET_CACHE_ENABLE( false );
  }

  PelBuf &dstBuf  = dstPic.bufs[compID];
  unsigned width  = dstBuf.width;
  unsigned height = dstBuf.height;

  CPelBuf refBuf;
  {
    Position offset = pu.blocks[compID].pos().offset( _mv.getHor() >> shiftHor, _mv.getVer() >> shiftVer );
#if JVET_M0147_DMVR
    if (dmvrWidth)
    {
      refBuf = refPic->getRecoBuf(CompArea(compID, chFmt, offset, Size(dmvrWidth, dmvrHeight)));
    }
    else
#endif
    refBuf = refPic->getRecoBuf( CompArea( compID, chFmt, offset, pu.blocks[compID].size() ) );
  }

#if JVET_M0147_DMVR
  if (NULL != srcPadBuf)
  {
    refBuf.buf = srcPadBuf;
    refBuf.stride = srcPadStride;
  }
  if (dmvrWidth)
  {
    width = dmvrWidth;
    height = dmvrHeight;
  }
#endif
  // backup data
  int backupWidth = width;
  int backupHeight = height;
  Pel *backupDstBufPtr = dstBuf.buf;
  int backupDstBufStride = dstBuf.stride;

  if (bioApplied && compID == COMPONENT_Y)
  {
    width = width + 2 * BIO_EXTEND_SIZE + 2;
    height = height + 2 * BIO_EXTEND_SIZE + 2;

    // change MC output
    dstBuf.stride = width;
    dstBuf.buf = m_filteredBlockTmp[2 + m_iRefListIdx][compID] + 2 * dstBuf.stride + 2;
  }

  if( yFrac == 0 )
  {
#if JVET_M0147_DMVR
    m_if.filterHor(compID, (Pel*)refBuf.buf, refBuf.stride, dstBuf.buf, dstBuf.stride, backupWidth, backupHeight, xFrac, rndRes, chFmt, clpRng, bilinearMC, bilinearMC);
#else
    m_if.filterHor(compID, (Pel*)refBuf.buf, refBuf.stride, dstBuf.buf, dstBuf.stride, backupWidth, backupHeight, xFrac, rndRes, chFmt, clpRng);
#endif
  }
  else if( xFrac == 0 )
  {
#if JVET_M0147_DMVR
    m_if.filterVer(compID, (Pel*)refBuf.buf, refBuf.stride, dstBuf.buf, dstBuf.stride, backupWidth, backupHeight, yFrac, true, rndRes, chFmt, clpRng, bilinearMC, bilinearMC);
#else
    m_if.filterVer(compID, (Pel*)refBuf.buf, refBuf.stride, dstBuf.buf, dstBuf.stride, backupWidth, backupHeight, yFrac, true, rndRes, chFmt, clpRng);
#endif
  }
  else
  {
#if JVET_M0147_DMVR
    PelBuf tmpBuf = dmvrWidth ? PelBuf(m_filteredBlockTmp[0][compID], Size(dmvrWidth, dmvrHeight)) : PelBuf(m_filteredBlockTmp[0][compID], pu.blocks[compID]);
    if (dmvrWidth == 0)
      tmpBuf.stride = dstBuf.stride;
#else
    PelBuf tmpBuf = PelBuf(m_filteredBlockTmp[0][compID], pu.blocks[compID]);
    tmpBuf.stride = dstBuf.stride;
#endif

    int vFilterSize = isLuma(compID) ? NTAPS_LUMA : NTAPS_CHROMA;
#if JVET_M0147_DMVR
    if (bilinearMC)
    {
      vFilterSize = NTAPS_BILINEAR;
    }
#endif
#if JVET_M0147_DMVR
    m_if.filterHor(compID, (Pel*)refBuf.buf - ((vFilterSize >> 1) - 1) * refBuf.stride, refBuf.stride, tmpBuf.buf, tmpBuf.stride, backupWidth, backupHeight + vFilterSize - 1, xFrac, false, chFmt, clpRng, bilinearMC, bilinearMC);
#else
    m_if.filterHor(compID, (Pel*)refBuf.buf - ((vFilterSize >> 1) - 1) * refBuf.stride, refBuf.stride, tmpBuf.buf, tmpBuf.stride, backupWidth, backupHeight + vFilterSize - 1, xFrac, false, chFmt, clpRng);
#endif
    JVET_J0090_SET_CACHE_ENABLE( false );
#if JVET_M0147_DMVR
    m_if.filterVer(compID, (Pel*)tmpBuf.buf + ((vFilterSize >> 1) - 1) * tmpBuf.stride, tmpBuf.stride, dstBuf.buf, dstBuf.stride, backupWidth, backupHeight, yFrac, false, rndRes, chFmt, clpRng, bilinearMC, bilinearMC);
#else
    m_if.filterVer(compID, (Pel*)tmpBuf.buf + ((vFilterSize >> 1) - 1) * tmpBuf.stride, tmpBuf.stride, dstBuf.buf, dstBuf.stride, backupWidth, backupHeight, yFrac, false, rndRes, chFmt, clpRng);
#endif
  }
  JVET_J0090_SET_CACHE_ENABLE( true );
  if (bioApplied && compID == COMPONENT_Y)
  {
#if JVET_M0487_INT_EXTEND
    const int shift = std::max<int>(2, (IF_INTERNAL_PREC - clpRng.bd));
    const Pel* refPel = refBuf.buf - refBuf.stride - 1;
    Pel* dstPel = m_filteredBlockTmp[2 + m_iRefListIdx][compID] + dstBuf.stride + 1;
    for (int w = 0; w < (width - 2 * BIO_EXTEND_SIZE); w++)
    {
      Pel val = leftShift_round(refPel[w], shift);
      dstPel[w] = val - (Pel)IF_INTERNAL_OFFS;
    }

    refPel = refBuf.buf - 1;
    dstPel = m_filteredBlockTmp[2 + m_iRefListIdx][compID] + 2 * dstBuf.stride + 1;
    for (int h = 0; h < (height - 2 * BIO_EXTEND_SIZE - 2); h++)
    {
      Pel val = leftShift_round(refPel[0], shift);
      dstPel[0] = val - (Pel)IF_INTERNAL_OFFS;

      val = leftShift_round(refPel[width - 3], shift);
      dstPel[width - 3] = val - (Pel)IF_INTERNAL_OFFS;

      refPel += refBuf.stride;
      dstPel += dstBuf.stride;
    }

    refPel = refBuf.buf + (height - 2 * BIO_EXTEND_SIZE - 2)*refBuf.stride - 1;
    dstPel = m_filteredBlockTmp[2 + m_iRefListIdx][compID] + (height - 2 * BIO_EXTEND_SIZE)*dstBuf.stride + 1;
    for (int w = 0; w < (width - 2 * BIO_EXTEND_SIZE); w++)
    {
      Pel val = leftShift_round(refPel[w], shift);
      dstPel[w] = val - (Pel)IF_INTERNAL_OFFS;
    }
#else
    refBuf.buf = refBuf.buf - refBuf.stride - 1;
#if JVET_M0147_DMVR
    if (srcPadBuf)
    {
      refBuf.buf = srcPadBuf - srcPadStride - 1;
      refBuf.stride = srcPadStride;
    }
#endif
    dstBuf.buf = m_filteredBlockTmp[2 + m_iRefListIdx][compID] + dstBuf.stride + 1;
    bioSampleExtendBilinearFilter(refBuf.buf, refBuf.stride, dstBuf.buf, dstBuf.stride, width - 2, height - 2, 1, xFrac, yFrac, rndRes, chFmt, clpRng);
#endif

    // restore data 
    width = backupWidth;
    height = backupHeight;
    dstBuf.buf = backupDstBufPtr;
    dstBuf.stride = backupDstBufStride;
  }
}

void InterPrediction::xPredAffineBlk( const ComponentID& compID, const PredictionUnit& pu, const Picture* refPic, const Mv* _mv, PelUnitBuf& dstPic, const bool& bi, const ClpRng& clpRng )
{
  if ( (pu.cu->affineType == AFFINEMODEL_6PARAM && _mv[0] == _mv[1] && _mv[0] == _mv[2])
    || (pu.cu->affineType == AFFINEMODEL_4PARAM && _mv[0] == _mv[1])
    )
  {
    Mv mvTemp = _mv[0];
    clipMv( mvTemp, pu.cu->lumaPos(),
            pu.cu->lumaSize(),
            *pu.cs->sps );
    xPredInterBlk( compID, pu, refPic, mvTemp, dstPic, bi, clpRng
                  , false
                  , false
                  );
    return;
  }

  JVET_J0090_SET_REF_PICTURE( refPic, compID );
  const ChromaFormat chFmt = pu.chromaFormat;
  int iScaleX = ::getComponentScaleX( compID, chFmt );
  int iScaleY = ::getComponentScaleY( compID, chFmt );

  Mv mvLT =_mv[0];
  Mv mvRT =_mv[1];
  Mv mvLB =_mv[2];


  // get affine sub-block width and height
  const int width  = pu.Y().width;
  const int height = pu.Y().height;
  int blockWidth = AFFINE_MIN_BLOCK_SIZE;
  int blockHeight = AFFINE_MIN_BLOCK_SIZE;

  blockWidth  >>= iScaleX;
  blockHeight >>= iScaleY;

  blockWidth =  std::max(blockWidth, AFFINE_MIN_BLOCK_SIZE);
  blockHeight = std::max(blockHeight, AFFINE_MIN_BLOCK_SIZE);

  CHECK(blockWidth  > (width >> iScaleX ), "Sub Block width  > Block width");
  CHECK(blockHeight > (height >> iScaleX), "Sub Block height > Block height");
  const int MVBUFFER_SIZE = MAX_CU_SIZE / MIN_PU_SIZE;

  const int cxWidth  = width  >> iScaleX;
  const int cxHeight = height >> iScaleY;
  const int iHalfBW  = blockWidth  >> 1;
  const int iHalfBH  = blockHeight >> 1;

  const int iBit = MAX_CU_DEPTH;
  int iDMvHorX, iDMvHorY, iDMvVerX, iDMvVerY;
  iDMvHorX = (mvRT - mvLT).getHor() << (iBit - g_aucLog2[cxWidth]);
  iDMvHorY = (mvRT - mvLT).getVer() << (iBit - g_aucLog2[cxWidth]);
  if ( pu.cu->affineType == AFFINEMODEL_6PARAM )
  {
    iDMvVerX = (mvLB - mvLT).getHor() << (iBit - g_aucLog2[cxHeight]);
    iDMvVerY = (mvLB - mvLT).getVer() << (iBit - g_aucLog2[cxHeight]);
  }
  else
  {
    iDMvVerX = -iDMvHorY;
    iDMvVerY = iDMvHorX;
  }

  int iMvScaleHor = mvLT.getHor() << iBit;
  int iMvScaleVer = mvLT.getVer() << iBit;
  const SPS &sps    = *pu.cs->sps;
  const int iMvShift = 4;
  const int iOffset  = 8;
  const int iHorMax = ( sps.getPicWidthInLumaSamples()     + iOffset -      pu.Y().x - 1 ) << iMvShift;
  const int iHorMin = (      -(int)pu.cs->pcv->maxCUWidth  - iOffset - (int)pu.Y().x + 1 ) << iMvShift;
  const int iVerMax = ( sps.getPicHeightInLumaSamples()    + iOffset -      pu.Y().y - 1 ) << iMvShift;
  const int iVerMin = (      -(int)pu.cs->pcv->maxCUHeight - iOffset - (int)pu.Y().y + 1 ) << iMvShift;

  PelBuf tmpBuf = PelBuf(m_filteredBlockTmp[0][compID], pu.blocks[compID]);
  const int vFilterSize = isLuma(compID) ? NTAPS_LUMA : NTAPS_CHROMA;

  const int shift = iBit - 4 + MV_FRACTIONAL_BITS_INTERNAL;

  // get prediction block by block
  for ( int h = 0; h < cxHeight; h += blockHeight )
  {
    for ( int w = 0; w < cxWidth; w += blockWidth )
    {

      int iMvScaleTmpHor, iMvScaleTmpVer;
      if(compID == COMPONENT_Y)
      {
        iMvScaleTmpHor = iMvScaleHor + iDMvHorX * (iHalfBW + w) + iDMvVerX * (iHalfBH + h);
        iMvScaleTmpVer = iMvScaleVer + iDMvHorY * (iHalfBW + w) + iDMvVerY * (iHalfBH + h);
        roundAffineMv(iMvScaleTmpHor, iMvScaleTmpVer, shift);
#if JVET_M0145_AFFINE_MV_CLIP
        Mv tmpMv(iMvScaleTmpHor, iMvScaleTmpVer);
        tmpMv.clipToStorageBitDepth();
        iMvScaleTmpHor = tmpMv.getHor();
        iMvScaleTmpVer = tmpMv.getVer();
#endif

        // clip and scale
        if (sps.getWrapAroundEnabledFlag())
        {
          m_storedMv[h / AFFINE_MIN_BLOCK_SIZE * MVBUFFER_SIZE + w / AFFINE_MIN_BLOCK_SIZE].set(iMvScaleTmpHor, iMvScaleTmpVer);
          Mv tmpMv(iMvScaleTmpHor, iMvScaleTmpVer);
          clipMv(tmpMv, Position(pu.Y().x + w, pu.Y().y + h), Size(blockWidth, blockHeight), sps);
          iMvScaleTmpHor = tmpMv.getHor();
          iMvScaleTmpVer = tmpMv.getVer();
        }
        else
        {
#if JVET_M0265_MV_ROUNDING_CLEANUP
          m_storedMv[h / AFFINE_MIN_BLOCK_SIZE * MVBUFFER_SIZE + w / AFFINE_MIN_BLOCK_SIZE].set(iMvScaleTmpHor, iMvScaleTmpVer);
#endif
          iMvScaleTmpHor = std::min<int>(iHorMax, std::max<int>(iHorMin, iMvScaleTmpHor));
          iMvScaleTmpVer = std::min<int>(iVerMax, std::max<int>(iVerMin, iMvScaleTmpVer));
#if !JVET_M0265_MV_ROUNDING_CLEANUP
          m_storedMv[h / AFFINE_MIN_BLOCK_SIZE * MVBUFFER_SIZE + w / AFFINE_MIN_BLOCK_SIZE].set(iMvScaleTmpHor, iMvScaleTmpVer);
#endif
        }
      }
      else
      {
#if JVET_M0265_MV_ROUNDING_CLEANUP
#if JVET_M0192_AFF_CHROMA_SIMPL
        Mv curMv = m_storedMv[((h << iScaleY) / AFFINE_MIN_BLOCK_SIZE) * MVBUFFER_SIZE + ((w << iScaleX) / AFFINE_MIN_BLOCK_SIZE)] +
          m_storedMv[((h << iScaleY) / AFFINE_MIN_BLOCK_SIZE + 1)* MVBUFFER_SIZE + ((w << iScaleX) / AFFINE_MIN_BLOCK_SIZE + 1)];
        roundAffineMv(curMv.hor, curMv.ver, 1);
#else
        Mv curMv = m_storedMv[((h << iScaleY) / AFFINE_MIN_BLOCK_SIZE) * MVBUFFER_SIZE + ((w << iScaleX) / AFFINE_MIN_BLOCK_SIZE)] +
          m_storedMv[((h << iScaleY) / AFFINE_MIN_BLOCK_SIZE + 1)* MVBUFFER_SIZE + ((w << iScaleX) / AFFINE_MIN_BLOCK_SIZE)] +
          m_storedMv[((h << iScaleY) / AFFINE_MIN_BLOCK_SIZE)* MVBUFFER_SIZE + ((w << iScaleX) / AFFINE_MIN_BLOCK_SIZE + 1)] +
          m_storedMv[((h << iScaleY) / AFFINE_MIN_BLOCK_SIZE + 1)* MVBUFFER_SIZE + ((w << iScaleX) / AFFINE_MIN_BLOCK_SIZE + 1)];
        roundAffineMv(curMv.hor, curMv.ver, 2);
#endif
#else
#if JVET_M0192_AFF_CHROMA_SIMPL
        Mv curMv = m_storedMv[((h << iScaleY) / AFFINE_MIN_BLOCK_SIZE) * MVBUFFER_SIZE + ((w << iScaleX) / AFFINE_MIN_BLOCK_SIZE)] +
          m_storedMv[((h << iScaleY) / AFFINE_MIN_BLOCK_SIZE + 1)* MVBUFFER_SIZE + ((w << iScaleX) / AFFINE_MIN_BLOCK_SIZE + 1)];
        roundAffineMv(curMv.hor, curMv.ver, 1);
#else
        Mv curMv = (m_storedMv[((h << iScaleY) / AFFINE_MIN_BLOCK_SIZE) * MVBUFFER_SIZE + ((w << iScaleX) / AFFINE_MIN_BLOCK_SIZE)] +
          m_storedMv[((h << iScaleY) / AFFINE_MIN_BLOCK_SIZE + 1)* MVBUFFER_SIZE + ((w << iScaleX) / AFFINE_MIN_BLOCK_SIZE)] +
          m_storedMv[((h << iScaleY) / AFFINE_MIN_BLOCK_SIZE)* MVBUFFER_SIZE + ((w << iScaleX) / AFFINE_MIN_BLOCK_SIZE + 1)] +
          m_storedMv[((h << iScaleY) / AFFINE_MIN_BLOCK_SIZE + 1)* MVBUFFER_SIZE + ((w << iScaleX) / AFFINE_MIN_BLOCK_SIZE + 1)] +
          Mv(2, 2));
        curMv.set(curMv.getHor() >> 2, curMv.getVer() >> 2);   
#endif
#endif
        if (sps.getWrapAroundEnabledFlag())
        {
          clipMv(curMv, Position(pu.Y().x + (w << iScaleX), pu.Y().y + (h << iScaleY)), Size(blockWidth << iScaleX, blockHeight << iScaleY), sps);
        }
#if JVET_M0265_MV_ROUNDING_CLEANUP
        else
        {
          curMv.hor = std::min<int>(iHorMax, std::max<int>(iHorMin, curMv.hor));
          curMv.ver = std::min<int>(iVerMax, std::max<int>(iVerMin, curMv.ver));
        }
#endif
        iMvScaleTmpHor = curMv.hor;
        iMvScaleTmpVer = curMv.ver;
      }
      // get the MV in high precision
      int xFrac, yFrac, xInt, yInt;

      if (!iScaleX)
      {
        xInt  = iMvScaleTmpHor >> 4;
        xFrac = iMvScaleTmpHor & 15;
      }
      else
      {
        xInt  = iMvScaleTmpHor >> 5;
        xFrac = iMvScaleTmpHor & 31;
      }
      if (!iScaleY)
      {
        yInt  = iMvScaleTmpVer >> 4;
        yFrac = iMvScaleTmpVer & 15;
      }
      else
      {
        yInt  = iMvScaleTmpVer >> 5;
        yFrac = iMvScaleTmpVer & 31;
      }

      const CPelBuf refBuf = refPic->getRecoBuf( CompArea( compID, chFmt, pu.blocks[compID].offset(xInt + w, yInt + h), pu.blocks[compID] ) );
      PelBuf &dstBuf = dstPic.bufs[compID];

      if ( yFrac == 0 )
      {
        m_if.filterHor( compID, (Pel*) refBuf.buf, refBuf.stride, dstBuf.buf + w + h * dstBuf.stride, dstBuf.stride, blockWidth, blockHeight, xFrac, !bi, chFmt, clpRng );
      }
      else if ( xFrac == 0 )
      {
        m_if.filterVer( compID, (Pel*) refBuf.buf, refBuf.stride, dstBuf.buf + w + h * dstBuf.stride, dstBuf.stride, blockWidth, blockHeight, yFrac, true, !bi, chFmt, clpRng );
      }
      else
      {
        m_if.filterHor( compID, (Pel*) refBuf.buf - ((vFilterSize>>1) -1)*refBuf.stride, refBuf.stride, tmpBuf.buf, tmpBuf.stride, blockWidth, blockHeight+vFilterSize-1, xFrac, false,      chFmt, clpRng);
        JVET_J0090_SET_CACHE_ENABLE( false );
        m_if.filterVer( compID, tmpBuf.buf + ((vFilterSize>>1) -1)*tmpBuf.stride, tmpBuf.stride, dstBuf.buf + w + h * dstBuf.stride, dstBuf.stride, blockWidth, blockHeight, yFrac, false, !bi, chFmt, clpRng);
        JVET_J0090_SET_CACHE_ENABLE( true );
      }
    }
  }
}

int getMSB( unsigned x )
{
  int msb = 0, bits = ( sizeof(int) << 3 ), y = 1;
  while( x > 1u )
  {
    bits >>= 1;
    y      = x >> bits;
    if( y )
    {
      x    = y;
      msb += bits;
    }
  }
  msb += y;
  return msb;
}

void InterPrediction::applyBiOptFlow(const PredictionUnit &pu, const CPelUnitBuf &yuvSrc0, const CPelUnitBuf &yuvSrc1, const int &refIdx0, const int &refIdx1, PelUnitBuf &yuvDst, const BitDepths &clipBitDepths)
{
  const int     height = yuvDst.Y().height;
  const int     width = yuvDst.Y().width;
  int           heightG = height + 2 * BIO_EXTEND_SIZE;
  int           widthG = width + 2 * BIO_EXTEND_SIZE;
  int           offsetPos = widthG*BIO_EXTEND_SIZE + BIO_EXTEND_SIZE;