InterPrediction.cpp

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 * and contributor rights, including patent rights, and no such rights are
 * granted under this license.
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 * Copyright (c) 2010-2018, ITU/ISO/IEC
 * All rights reserved.
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 *    this list of conditions and the following disclaimer.
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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 )
#if JVET_L0256_BIO
, m_gradX0(nullptr)
, m_gradY0(nullptr)
, m_gradX1(nullptr)
, m_gradY1(nullptr)
, m_subPuMC(false)
#endif
{
  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; i++ )
    {
      for( uint32_t j = 0; j < LUMA_INTERPOLATION_FILTER_SUB_SAMPLE_POSITIONS; j++ )
      {
        m_filteredBlock[i][j][c] = nullptr;
      }

      m_filteredBlockTmp[i][c] = nullptr;
    }
  }

}

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

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

#if JVET_L0256_BIO
  xFree(m_gradX0);   m_gradX0 = nullptr;
  xFree(m_gradY0);   m_gradY0 = nullptr;
  xFree(m_gradX1);   m_gradX1 = nullptr;
  xFree(m_gradY1);   m_gradY1 = 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++ )
    {
#if JVET_L0256_BIO
      int extWidth = MAX_CU_SIZE + (2 * BIO_EXTEND_SIZE + 2) + 16;
      int extHeight = MAX_CU_SIZE + (2 * BIO_EXTEND_SIZE + 2) + 1;
#else
      int extWidth  = MAX_CU_SIZE + 16;
      int extHeight = MAX_CU_SIZE + 1;
#endif
      for( uint32_t i = 0; i < LUMA_INTERPOLATION_FILTER_SUB_SAMPLE_POSITIONS; 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; 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_iRefListIdx = -1;
  
#if JVET_L0256_BIO
    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);
#endif
  }

#if !JVET_J0090_MEMORY_BANDWITH_MEASURE
  m_if.initInterpolationFilter( true );
#endif
}

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." );
          const CMotionBuf &mb = pu.getMotionBuf();
          if ( (pu.cu->affineType == AFFINEMODEL_4PARAM && (mb.at( 0, 0 ).mv[0] == mb.at( 0, 0 ).mv[1]) && (mb.at( mb.width - 1, 0 ).mv[0] == mb.at( mb.width - 1, 0 ).mv[1]))
            || (pu.cu->affineType == AFFINEMODEL_6PARAM && (mb.at( 0, 0 ).mv[0] == mb.at( 0, 0 ).mv[1]) && (mb.at( mb.width - 1, 0 ).mv[0] == mb.at( mb.width - 1, 0 ).mv[1]) && (mb.at( 0, mb.height - 1 ).mv[0] == mb.at( 0, mb.height - 1 ).mv[1])) )
          {
            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
        {
          const CMotionBuf &mb = pu.getMotionBuf();
          if ( (pu.cu->affineType == AFFINEMODEL_4PARAM && (mb.at( 0, 0 ).mv[0] == mb.at( 0, 0 ).mv[1]) && (mb.at( mb.width - 1, 0 ).mv[0] == mb.at( mb.width - 1, 0 ).mv[1]))
            || (pu.cu->affineType == AFFINEMODEL_6PARAM && (mb.at( 0, 0 ).mv[0] == mb.at( 0, 0 ).mv[1]) && (mb.at( mb.width - 1, 0 ).mv[0] == mb.at( mb.width - 1, 0 ).mv[1]) && (mb.at( 0, mb.height - 1 ).mv[0] == mb.at( 0, mb.height - 1 ).mv[1])) )
          {
            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;
  {
    const Slice& slice = *pu.cs->slice;
    numPartLine = std::max(puSize.width >> slice.getSubPuMvpSubblkLog2Size(), 1u);
    numPartCol  = std::max(puSize.height >> slice.getSubPuMvpSubblkLog2Size(), 1u);
    puHeight    = numPartCol == 1 ? puSize.height : 1 << slice.getSubPuMvpSubblkLog2Size();
    puWidth     = numPartLine == 1 ? puSize.width : 1 << slice.getSubPuMvpSubblkLog2Size();
  }

  PredictionUnit subPu;

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

#if JVET_L0369_SUBBLOCK_MERGE
  bool bAffine = pu.cu->affine;
  subPu.cu->affine = false;
#endif

  // 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);

#if JVET_L0256_BIO
  m_subPuMC = true;
#endif

  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));

      motionCompensation(subPu, subPredBuf, eRefPicList);
      secDim = later - secStep;
    }
  }
#if JVET_L0256_BIO
  m_subPuMC = false;
#endif

#if JVET_L0369_SUBBLOCK_MERGE
  pu.cu->affine = bAffine;
#endif
}


void InterPrediction::xPredInterUni(const PredictionUnit& pu, const RefPicList& eRefPicList, PelUnitBuf& pcYuvPred, const bool& bi 
#if JVET_L0256_BIO
                                   ,const bool& bioApplied /*=false*/
#endif
)
{
  const SPS &sps = *pu.cs->sps;

  int iRefIdx = pu.refIdx[eRefPicList];
  Mv mv[3];

  if( pu.cu->affine )
  {
    CHECK( iRefIdx < 0, "iRefIdx incorrect." );

#if JVET_L0694_AFFINE_LINEBUFFER_CLEANUP
    mv[0] = pu.mvAffi[eRefPicList][0];
    mv[1] = pu.mvAffi[eRefPicList][1];
    mv[2] = pu.mvAffi[eRefPicList][2];
#else
    const CMotionBuf &mb = pu.getMotionBuf();
    mv[0] = mb.at( 0,            0             ).mv[eRefPicList];
    mv[1] = mb.at( mb.width - 1, 0             ).mv[eRefPicList];
    mv[2] = mb.at( 0,            mb.height - 1 ).mv[eRefPicList];
#endif
  }
  else
  {
    mv[0] = pu.mv[eRefPicList];
  }
  if ( !pu.cu->affine )
  clipMv(mv[0], pu.cu->lumaPos(), sps);


  for( uint32_t comp = COMPONENT_Y; comp < pcYuvPred.bufs.size() && comp <= m_maxCompIDToPred; comp++ )
  {
    const ComponentID compID = ComponentID( comp );
    if ( pu.cu->affine )
    {
#if JVET_L0256_BIO
      CHECK( bioApplied, "BIO is not allowed with affine" );
#endif
      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 )
#if JVET_L0256_BIO
                    ,bioApplied
#endif
      );
    }
  }
}

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

#if JVET_L0256_BIO
  bool bioApplied = false;
  if (pu.cs->sps->getSpsNext().getUseBIO())
  {
    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_L0646_GBI
    if (pu.cu->cs->sps->getSpsNext().getUseGBi() && bioApplied && pu.cu->GBiIdx != GBI_DEFAULT)
    {
      bioApplied = false;
    }
#endif
  }
#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)
    {
      xPredInterUni ( pu, eRefPicList, pcMbBuf, true
#if JVET_L0256_BIO
                     ,bioApplied 
#endif
                     );
    }
    else
    {
      if( ( (pps.getUseWP() && slice.getSliceType() == P_SLICE) || (pps.getWPBiPred() && slice.getSliceType() == B_SLICE) ) )
      {
        xPredInterUni ( pu, eRefPicList, pcMbBuf, true );
      }
      else
      {
        xPredInterUni ( pu, eRefPicList, pcMbBuf, false );
      }
    }
  }


  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_L0256_BIO
    xWeightedAverage( pu, srcPred0, srcPred1, pcYuvPred, slice.getSPS()->getBitDepths(), slice.clpRngs(), bioApplied );
#else
    xWeightedAverage( pu, srcPred0, srcPred1, pcYuvPred, slice.getSPS()->getBitDepths(), slice.clpRngs() );
#endif
  }
}

void InterPrediction::xPredInterBlk ( const ComponentID& compID, const PredictionUnit& pu, const Picture* refPic, const Mv& _mv, PelUnitBuf& dstPic, const bool& bi, const ClpRng& clpRng
#if JVET_L0256_BIO
                                     ,const bool& bioApplied /*=false*/
#endif
)
{
  JVET_J0090_SET_REF_PICTURE( refPic, compID );
  const ChromaFormat  chFmt = pu.chromaFormat;
  const bool          rndRes = !bi;

  int iAddPrecShift = 0;

#if !REMOVE_MV_ADAPT_PREC
  if (_mv.highPrec)
  {
    CHECKD(!pu.cs->sps->getSpsNext().getUseHighPrecMv(), "Found a high-precision motion vector, but the high-precision MV extension is disabled!");
#endif
    iAddPrecShift = VCEG_AZ07_MV_ADD_PRECISION_BIT_FOR_STORE;
#if !REMOVE_MV_ADAPT_PREC
  }
#endif

  int shiftHor = 2 + iAddPrecShift + ::getComponentScaleX(compID, chFmt);
  int shiftVer = 2 + iAddPrecShift + ::getComponentScaleY(compID, chFmt);

  int xFrac = _mv.hor & ((1 << shiftHor) - 1);
  int yFrac = _mv.ver & ((1 << shiftVer) - 1);

  xFrac <<= VCEG_AZ07_MV_ADD_PRECISION_BIT_FOR_STORE - iAddPrecShift;
  yFrac <<= VCEG_AZ07_MV_ADD_PRECISION_BIT_FOR_STORE - iAddPrecShift;
#if !REMOVE_MV_ADAPT_PREC
  CHECKD(!pu.cs->sps->getSpsNext().getUseHighPrecMv() && ((xFrac & 3) != 0), "Invalid fraction");
  CHECKD(!pu.cs->sps->getSpsNext().getUseHighPrecMv() && ((yFrac & 3) != 0), "Invalid fraction");
#endif

  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 );
    refBuf = refPic->getRecoBuf( CompArea( compID, chFmt, offset, pu.blocks[compID].size() ) );
  }

#if JVET_L0256_BIO
  // 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;
  }
#endif

  if( yFrac == 0 )
  {
#if JVET_L0256_BIO
    m_if.filterHor(compID, (Pel*)refBuf.buf, refBuf.stride, dstBuf.buf, dstBuf.stride, backupWidth, backupHeight, xFrac, rndRes, chFmt, clpRng);
#else
    m_if.filterHor(compID, (Pel*) refBuf.buf, refBuf.stride, dstBuf.buf, dstBuf.stride, width, height, xFrac, rndRes, chFmt, clpRng);
#endif
  }
  else if( xFrac == 0 )
  {
#if JVET_L0256_BIO
    m_if.filterVer(compID, (Pel*)refBuf.buf, refBuf.stride, dstBuf.buf, dstBuf.stride, backupWidth, backupHeight, yFrac, true, rndRes, chFmt, clpRng);
#else
    m_if.filterVer(compID, (Pel*) refBuf.buf, refBuf.stride, dstBuf.buf, dstBuf.stride, width, height, yFrac, true, rndRes, chFmt, clpRng);
#endif
  }
  else
  {
    PelBuf tmpBuf = PelBuf(m_filteredBlockTmp[0][compID], pu.blocks[compID]);
#if JVET_L0256_BIO
    tmpBuf.stride = dstBuf.stride;
#endif

    int vFilterSize = isLuma(compID) ? NTAPS_LUMA : NTAPS_CHROMA;
#if JVET_L0256_BIO
    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);
#else
    m_if.filterHor(compID, (Pel*) refBuf.buf - ((vFilterSize >> 1) - 1) * refBuf.stride, refBuf.stride, tmpBuf.buf, tmpBuf.stride, width, height + vFilterSize - 1, xFrac, false,         chFmt, clpRng);
#endif
    JVET_J0090_SET_CACHE_ENABLE( false );
#if JVET_L0256_BIO
    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);
#else
    m_if.filterVer(compID, (Pel*) tmpBuf.buf + ((vFilterSize >> 1) - 1) * tmpBuf.stride, tmpBuf.stride, dstBuf.buf, dstBuf.stride, width, height,                   yFrac, false, rndRes, chFmt, clpRng);
#endif
    JVET_J0090_SET_CACHE_ENABLE( true );
  }
#if JVET_L0256_BIO
  if (bioApplied && compID == COMPONENT_Y)
  {
    refBuf.buf = refBuf.buf - refBuf.stride - 1;
    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);

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

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.cs->sps );
    xPredInterBlk( compID, pu, refPic, mvTemp, dstPic, bi, clpRng );
    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];

#if !REMOVE_MV_ADAPT_PREC
  mvLT.setHighPrec();
  mvRT.setHighPrec();
  mvLB.setHighPrec();
#endif

  // 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;
  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 + VCEG_AZ07_MV_ADD_PRECISION_BIT_FOR_STORE + 2;

  // get prediction block by block
  for ( int h = 0; h < cxHeight; h += blockHeight )
  {
    for ( int w = 0; w < cxWidth; w += blockWidth )
    {
      int iMvScaleTmpHor = iMvScaleHor + iDMvHorX * (iHalfBW + w) + iDMvVerX * (iHalfBH + h);
      int iMvScaleTmpVer = iMvScaleVer + iDMvHorY * (iHalfBW + w) + iDMvVerY * (iHalfBH + h);
      roundAffineMv( iMvScaleTmpHor, iMvScaleTmpVer, shift );

      // clip and scale
      iMvScaleTmpHor = std::min<int>( iHorMax, std::max<int>( iHorMin, iMvScaleTmpHor ) );
      iMvScaleTmpVer = std::min<int>( iVerMax, std::max<int>( iVerMin, iMvScaleTmpVer ) );

      // 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;
}

#if JVET_L0256_BIO
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;

  Pel*          gradX0 = m_gradX0;
  Pel*          gradX1 = m_gradX1;
  Pel*          gradY0 = m_gradY0;
  Pel*          gradY1 = m_gradY1;

  int           stridePredMC = widthG + 2;
  const Pel*    srcY0 = m_filteredBlockTmp[2][COMPONENT_Y] + stridePredMC + 1;
  const Pel*    srcY1 = m_filteredBlockTmp[3][COMPONENT_Y] + stridePredMC + 1;
  const int     src0Stride = stridePredMC;
  const int     src1Stride = stridePredMC;

  Pel*          dstY = yuvDst.Y().buf;
  const int     dstStride = yuvDst.Y().stride;
  const Pel*    srcY0Temp = srcY0;
  const Pel*    srcY1Temp = srcY1;

  for (int refList = 0; refList < NUM_REF_PIC_LIST_01; refList++)
  {
    Pel* dstTempPtr = m_filteredBlockTmp[2 + refList][COMPONENT_Y] + stridePredMC + 1;
    Pel* gradY = (refList == 0) ? m_gradY0 : m_gradY1;
    Pel* gradX = (refList == 0) ? m_gradX0 : m_gradX1;

    g_pelBufOP.bioGradFilter(dstTempPtr, stridePredMC, widthG, heightG, widthG, gradX, gradY);
    Pel* padStr = m_filteredBlockTmp[2 + refList][COMPONENT_Y] + 2 * stridePredMC + 2;
    for (int y = 0; y< height; y++)
    {
      padStr[-1] = padStr[0];
      padStr[width] = padStr[width - 1];
      padStr += stridePredMC;
    }

    padStr = m_filteredBlockTmp[2 + refList][COMPONENT_Y] + 2 * stridePredMC + 1;
    ::memcpy(padStr - stridePredMC, padStr, sizeof(Pel)*(widthG));
    ::memcpy(padStr + height*stridePredMC, padStr + (height - 1)*stridePredMC, sizeof(Pel)*(widthG));
  }

  const ClpRng& clpRng = pu.cu->cs->slice->clpRng(COMPONENT_Y);
  const int   bitDepth = clipBitDepths.recon[toChannelType(COMPONENT_Y)];
  const int   shiftNum = IF_INTERNAL_PREC + 1 - bitDepth;
  const int   offset = (1 << (shiftNum - 1)) + 2 * IF_INTERNAL_OFFS;
  const int   limit = ((int)1 << (4 + IF_INTERNAL_PREC - bitDepth - 5));

  int*     dotProductTemp1 = m_dotProduct1;
  int*     dotProductTemp2 = m_dotProduct2;
  int*     dotProductTemp3 = m_dotProduct3;
  int*     dotProductTemp5 = m_dotProduct5;
  int*     dotProductTemp6 = m_dotProduct6;

  g_pelBufOP.calcBIOPar(srcY0Temp, srcY1Temp, gradX0, gradX1, gradY0, gradY1, dotProductTemp1, dotProductTemp2, dotProductTemp3, dotProductTemp5, dotProductTemp6, src0Stride, src1Stride, widthG, widthG, heightG);

  int xUnit = (width >> 2);
  int yUnit = (height >> 2);

  Pel *dstY0 = dstY;
  gradX0 = m_gradX0; gradX1 = m_gradX1;
  gradY0 = m_gradY0; gradY1 = m_gradY1;

  for (int yu = 0; yu < yUnit; yu++)
  {
    for (int xu = 0; xu < xUnit; xu++)
    {
      if (m_bioPredSubBlkDist[yu*xUnit + xu] < m_bioSubBlkDistThres)
      {
        srcY0Temp = srcY0 + (stridePredMC + 1) + ((yu*src0Stride + xu) << 2);
        srcY1Temp = srcY1 + (stridePredMC + 1) + ((yu*src1Stride + xu) << 2);
        dstY0 = dstY + ((yu*dstStride + xu) << 2);
        g_pelBufOP.addAvg4(srcY0Temp, src0Stride, srcY1Temp, src1Stride, dstY0, dstStride, (1 << 2), (1 << 2), shiftNum, offset, clpRng);
        continue;
      }

      int     sGxdI = 0, sGydI = 0, sGxGy = 0, sGx2 = 0, sGy2 = 0;
      int     tmpx = 0, tmpy = 0;

      dotProductTemp1 = m_dotProduct1 + offsetPos + ((yu*widthG + xu) << 2);
      dotProductTemp2 = m_dotProduct2 + offsetPos + ((yu*widthG + xu) << 2);
      dotProductTemp3 = m_dotProduct3 + offsetPos + ((yu*widthG + xu) << 2);
      dotProductTemp5 = m_dotProduct5 + offsetPos + ((yu*widthG + xu) << 2);
      dotProductTemp6 = m_dotProduct6 + offsetPos + ((yu*widthG + xu) << 2);

      g_pelBufOP.calcBlkGradient(xu << 2, yu << 2, dotProductTemp1, dotProductTemp2, dotProductTemp3, dotProductTemp5, dotProductTemp6, sGx2, sGy2, sGxGy, sGxdI, sGydI, widthG, heightG, (1 << 2));

      if (sGx2 > 0)
      {
        tmpx = rightShiftMSB(sGxdI << 3, sGx2);
        tmpx = Clip3(-limit, limit, tmpx);
      }
      if (sGy2 > 0)
      {
        int     mainsGxGy = sGxGy >> 12;
        int     secsGxGy = sGxGy & ((1 << 12) - 1);
        int     tmpData = tmpx * mainsGxGy;
        tmpData = ((tmpData << 12) + tmpx*secsGxGy) >> 1;
        tmpy = rightShiftMSB(((sGydI << 3) - tmpData), sGy2);
        tmpy = Clip3(-limit, limit, tmpy);
      }

      srcY0Temp = srcY0 + (stridePredMC + 1) + ((yu*src0Stride + xu) << 2);
      srcY1Temp = srcY1 + (stridePredMC + 1) + ((yu*src0Stride + xu) << 2);
      gradX0 = m_gradX0 + offsetPos + ((yu*widthG + xu) << 2);
      gradX1 = m_gradX1 + offsetPos + ((yu*widthG + xu) << 2);
      gradY0 = m_gradY0 + offsetPos + ((yu*widthG + xu) << 2);
      gradY1 = m_gradY1 + offsetPos + ((yu*widthG + xu) << 2);

      dstY0 = dstY + ((yu*dstStride + xu) << 2);
      g_pelBufOP.addBIOAvg4(srcY0Temp, src0Stride, srcY1Temp, src1Stride, dstY0, dstStride, gradX0, gradX1, gradY0, gradY1, widthG, (1 << 2), (1 << 2), (int)tmpx, (int)tmpy, shiftNum, offset, clpRng);
    }  // xu
  }  // yu
}

void InterPrediction::bioSampleExtendBilinearFilter(Pel const* src, int srcStride, Pel *dst, int dstStride, int width, int height, int dim, int fracX, int fracY, bool isLast, const ChromaFormat fmt, const ClpRng& clpRng)
{
  Pel const* pSrc = NULL;
  Pel*       pDst = NULL;

  int vFilterSize = NTAPS_LUMA;
  int widthTmp = 0;
  int heightTmp = 0;

  for (int cand = 0; cand < 4; cand++)  // top, left, bottom and right
  {

    if (cand == 0)  // top
    {
      pSrc = src;
      pDst = dst;
      widthTmp = width;
      heightTmp = dim;
    }
    else if (cand == 1)  // left
    {
      pSrc = src + dim*srcStride;
      pDst = dst + dim*dstStride;
      widthTmp = dim;
      heightTmp = height - 2 * dim;
    }
    else if (cand == 2)  // bottom
    {
      pSrc = src + (height - dim)*srcStride;
      pDst = dst + (height - dim)*dstStride;
      widthTmp = width;
      heightTmp = dim;
    }
    else if (cand == 3)  // right
    {
      pSrc = src + dim*srcStride + width - dim;
      pDst = dst + dim*dstStride + width - dim;
      widthTmp = dim;
      heightTmp = height - 2 * dim;
    }

    if (fracY == 0)
    {
      m_if.filterHor(COMPONENT_Y, pSrc, srcStride, pDst, dstStride, widthTmp, heightTmp, fracX, isLast, fmt, clpRng, 1);
    }
    else if (fracX == 0)
    {
      m_if.filterVer(COMPONENT_Y, pSrc, srcStride, pDst, dstStride, widthTmp, heightTmp, fracY, true, isLast, fmt, clpRng, 1);
    }
    else
    {
      PelBuf tmpBuf = PelBuf(m_filteredBlockTmp[0][COMPONENT_Y], Size(width, height));
      tmpBuf.stride = width;

      m_if.filterHor(COMPONENT_Y, pSrc - ((vFilterSize >> 1) - 1) * srcStride, srcStride, tmpBuf.buf, tmpBuf.stride, widthTmp, heightTmp + vFilterSize - 1, fracX, false, fmt, clpRng, 1);
      m_if.filterVer(COMPONENT_Y, tmpBuf.buf + ((vFilterSize >> 1) - 1) * tmpBuf.stride, tmpBuf.stride, pDst, dstStride, widthTmp, heightTmp, fracY, false, isLast, fmt, clpRng, 1);
    }
  }
}

bool InterPrediction::xCalcBiPredSubBlkDist(const PredictionUnit &pu, const Pel* pYuvSrc0, const int src0Stride, const Pel* pYuvSrc1, const int src1Stride, const BitDepths &clipBitDepths)
{
  const int     width = pu.lwidth();
  const int     height = pu.lheight();
  const int     clipbd = clipBitDepths.recon[toChannelType(COMPONENT_Y)];
  const uint32_t distortionShift = DISTORTION_PRECISION_ADJUSTMENT(clipbd);
  const int     shift = std::max<int>(2, (IF_INTERNAL_PREC - clipbd));
  const int     xUnit = (width >> 2);
  const int     yUnit = (height >> 2);

  m_bioDistThres = (shift <= 5) ? (((32 << (clipbd - 8))*width*height) >> (5 - shift)) : (((32 << (clipbd - 8))*width*height) << (shift - 5));
  m_bioSubBlkDistThres = (shift <= 5) ? (((64 << (clipbd - 8)) << 4) >> (5 - shift)) : (((64 << (clipbd - 8)) << 4) << (shift - 5));

  m_bioDistThres >>= distortionShift;
  m_bioSubBlkDistThres >>= distortionShift;

  DistParam cDistParam;
  Distortion dist = 0;
  for (int yu = 0, blkIdx = 0; yu < yUnit; yu++)
  {
    for (int xu = 0; xu < xUnit; xu++, blkIdx++)
    {
      const Pel* pPred0 = pYuvSrc0 + ((yu*src0Stride + xu) << 2);
      const Pel* pPred1 = pYuvSrc1 + ((yu*src1Stride + xu) << 2);

      m_pcRdCost->setDistParam(cDistParam, pPred0, pPred1, src0Stride, src1Stride, clipbd, COMPONENT_Y, (1 << 2), (1 << 2), 0, 1, false, true);
      m_bioPredSubBlkDist[blkIdx] = cDistParam.distFunc(cDistParam);
      dist += m_bioPredSubBlkDist[blkIdx];
    }
  }

  return (dist >= m_bioDistThres);
}
#endif

#if JVET_L0256_BIO
void InterPrediction::xWeightedAverage(const PredictionUnit& pu, const CPelUnitBuf& pcYuvSrc0, const CPelUnitBuf& pcYuvSrc1, PelUnitBuf& pcYuvDst, const BitDepths& clipBitDepths, const ClpRngs& clpRngs, const bool& bioApplied )
#else
void InterPrediction::xWeightedAverage( const PredictionUnit& pu, const CPelUnitBuf& pcYuvSrc0, const CPelUnitBuf& pcYuvSrc1, PelUnitBuf& pcYuvDst, const BitDepths& clipBitDepths, const ClpRngs& clpRngs )
#endif
{
  const int iRefIdx0 = pu.refIdx[0];
  const int iRefIdx1 = pu.refIdx[1];

  if( iRefIdx0 >= 0 && iRefIdx1 >= 0 )
  {
#if JVET_L0646_GBI
    if( pu.cu->GBiIdx != GBI_DEFAULT )
    {
#if JVET_L0256_BIO
      CHECK(bioApplied, "GBi is disallowed with BIO");
#endif
      pcYuvDst.addWeightedAvg(pcYuvSrc0, pcYuvSrc1, clpRngs, pu.cu->GBiIdx);
      return;
    }
#endif
#if JVET_L0256_BIO
    if (bioApplied)
    {
      const int  src0Stride = pu.lwidth() + 2 * BIO_EXTEND_SIZE + 2;
      const int  src1Stride = pu.lwidth() + 2 * BIO_EXTEND_SIZE + 2;
      const Pel* pSrcY0 = m_filteredBlockTmp[2][COMPONENT_Y] + 2 * src0Stride + 2;