UnitTools.cpp

  Mv mvLT, mvRT, mvLB;
  mvLT = puNeighbour->mvAffi[eRefPicList][0];
  mvRT = puNeighbour->mvAffi[eRefPicList][1];
  mvLB = puNeighbour->mvAffi[eRefPicList][2];

  bool isTopCtuBoundary = false;
  if ( (posNeiY + neiH) % pu.cs->sps->getCTUSize() == 0 && (posNeiY + neiH) == posCurY )
  {
    // use bottom-left and bottom-right sub-block MVs for inheritance
    const Position posRB = puNeighbour->Y().bottomRight();
    const Position posLB = puNeighbour->Y().bottomLeft();
    mvLT = puNeighbour->getMotionInfo( posLB ).mv[eRefPicList];
    mvRT = puNeighbour->getMotionInfo( posRB ).mv[eRefPicList];
    posNeiY += neiH;
    isTopCtuBoundary = true;
  }

  int shift = MAX_CU_DEPTH;
  int iDMvHorX, iDMvHorY, iDMvVerX, iDMvVerY;

  iDMvHorX = (mvRT - mvLT).getHor() << (shift - g_aucLog2[neiW]);
  iDMvHorY = (mvRT - mvLT).getVer() << (shift - g_aucLog2[neiW]);
  if ( puNeighbour->cu->affineType == AFFINEMODEL_6PARAM && !isTopCtuBoundary )
  {
    iDMvVerX = (mvLB - mvLT).getHor() << (shift - g_aucLog2[neiH]);
    iDMvVerY = (mvLB - mvLT).getVer() << (shift - g_aucLog2[neiH]);
  }
  else
  {
    iDMvVerX = -iDMvHorY;
    iDMvVerY = iDMvHorX;
  }

  int iMvScaleHor = mvLT.getHor() << shift;
  int iMvScaleVer = mvLT.getVer() << shift;
  int horTmp, verTmp;

  // v0
  horTmp = iMvScaleHor + iDMvHorX * (posCurX - posNeiX) + iDMvVerX * (posCurY - posNeiY);
  verTmp = iMvScaleVer + iDMvHorY * (posCurX - posNeiX) + iDMvVerY * (posCurY - posNeiY);
  roundAffineMv( horTmp, verTmp, shift );
  rcMv[0].hor = horTmp;
  rcMv[0].ver = verTmp;
#if JVET_M0145_AFFINE_MV_CLIP
  rcMv[0].clipToStorageBitDepth();
#endif

  // v1
  horTmp = iMvScaleHor + iDMvHorX * (posCurX + curW - posNeiX) + iDMvVerX * (posCurY - posNeiY);
  verTmp = iMvScaleVer + iDMvHorY * (posCurX + curW - posNeiX) + iDMvVerY * (posCurY - posNeiY);
  roundAffineMv( horTmp, verTmp, shift );
  rcMv[1].hor = horTmp;
  rcMv[1].ver = verTmp;
#if JVET_M0145_AFFINE_MV_CLIP
  rcMv[1].clipToStorageBitDepth();
#endif

  // v2
  if ( pu.cu->affineType == AFFINEMODEL_6PARAM )
  {
    horTmp = iMvScaleHor + iDMvHorX * (posCurX - posNeiX) + iDMvVerX * (posCurY + curH - posNeiY);
    verTmp = iMvScaleVer + iDMvHorY * (posCurX - posNeiX) + iDMvVerY * (posCurY + curH - posNeiY);
    roundAffineMv( horTmp, verTmp, shift );
    rcMv[2].hor = horTmp;
    rcMv[2].ver = verTmp;
#if JVET_M0145_AFFINE_MV_CLIP
    rcMv[2].clipToStorageBitDepth();
#endif
  }
}


void PU::fillAffineMvpCand(PredictionUnit &pu, const RefPicList &eRefPicList, const int &refIdx, AffineAMVPInfo &affiAMVPInfo)
{
  affiAMVPInfo.numCand = 0;

  if (refIdx < 0)
  {
    return;
  }


  // insert inherited affine candidates
  Mv outputAffineMv[3];
  Position posLT = pu.Y().topLeft();
  Position posRT = pu.Y().topRight();
  Position posLB = pu.Y().bottomLeft();

  // check left neighbor
  if ( !addAffineMVPCandUnscaled( pu, eRefPicList, refIdx, posLB, MD_BELOW_LEFT, affiAMVPInfo ) )
  {
    addAffineMVPCandUnscaled( pu, eRefPicList, refIdx, posLB, MD_LEFT, affiAMVPInfo );
  }

  // check above neighbor
  if ( !addAffineMVPCandUnscaled( pu, eRefPicList, refIdx, posRT, MD_ABOVE_RIGHT, affiAMVPInfo ) )
  {
    if ( !addAffineMVPCandUnscaled( pu, eRefPicList, refIdx, posRT, MD_ABOVE, affiAMVPInfo ) )
    {
      addAffineMVPCandUnscaled( pu, eRefPicList, refIdx, posLT, MD_ABOVE_LEFT, affiAMVPInfo );
    }
  }

  if ( affiAMVPInfo.numCand >= AMVP_MAX_NUM_CANDS )
  {
    for (int i = 0; i < affiAMVPInfo.numCand; i++)
    {
#if JVET_M0246_AFFINE_AMVR
      if ( pu.cu->imv != 1 )
      {
#endif
        affiAMVPInfo.mvCandLT[i].changePrecision(MV_PRECISION_INTERNAL, MV_PRECISION_QUARTER);
        affiAMVPInfo.mvCandRT[i].changePrecision(MV_PRECISION_INTERNAL, MV_PRECISION_QUARTER);
        affiAMVPInfo.mvCandLB[i].changePrecision(MV_PRECISION_INTERNAL, MV_PRECISION_QUARTER);
#if JVET_M0246_AFFINE_AMVR
      }
#endif
    }
    return;
  }

  // insert constructed affine candidates
  int cornerMVPattern = 0;

  //-------------------  V0 (START) -------------------//
  AMVPInfo amvpInfo0;
  amvpInfo0.numCand = 0;

  // A->C: Above Left, Above, Left
  addMVPCandUnscaled( pu, eRefPicList, refIdx, posLT, MD_ABOVE_LEFT, amvpInfo0 );
  if ( amvpInfo0.numCand < 1 )
  {
    addMVPCandUnscaled( pu, eRefPicList, refIdx, posLT, MD_ABOVE, amvpInfo0 );
  }
  if ( amvpInfo0.numCand < 1 )
  {
    addMVPCandUnscaled( pu, eRefPicList, refIdx, posLT, MD_LEFT, amvpInfo0 );
  }
  cornerMVPattern = cornerMVPattern | amvpInfo0.numCand;

  //-------------------  V1 (START) -------------------//
  AMVPInfo amvpInfo1;
  amvpInfo1.numCand = 0;

  // D->E: Above, Above Right
  addMVPCandUnscaled( pu, eRefPicList, refIdx, posRT, MD_ABOVE, amvpInfo1 );
  if ( amvpInfo1.numCand < 1 )
  {
    addMVPCandUnscaled( pu, eRefPicList, refIdx, posRT, MD_ABOVE_RIGHT, amvpInfo1 );
  }
  cornerMVPattern = cornerMVPattern | (amvpInfo1.numCand << 1);

  //-------------------  V2 (START) -------------------//
  AMVPInfo amvpInfo2;
  amvpInfo2.numCand = 0;

  // F->G: Left, Below Left
  addMVPCandUnscaled( pu, eRefPicList, refIdx, posLB, MD_LEFT, amvpInfo2 );
  if ( amvpInfo2.numCand < 1 )
  {
    addMVPCandUnscaled( pu, eRefPicList, refIdx, posLB, MD_BELOW_LEFT, amvpInfo2 );
  }
  cornerMVPattern = cornerMVPattern | (amvpInfo2.numCand << 2);

  outputAffineMv[0] = amvpInfo0.mvCand[0];
  outputAffineMv[1] = amvpInfo1.mvCand[0];
  outputAffineMv[2] = amvpInfo2.mvCand[0];

#if JVET_M0246_AFFINE_AMVR
  if ( pu.cu->imv == 0 )
  {
#endif
    outputAffineMv[0].roundToPrecision(MV_PRECISION_INTERNAL, MV_PRECISION_QUARTER);
    outputAffineMv[1].roundToPrecision(MV_PRECISION_INTERNAL, MV_PRECISION_QUARTER);
    outputAffineMv[2].roundToPrecision(MV_PRECISION_INTERNAL, MV_PRECISION_QUARTER);
#if JVET_M0246_AFFINE_AMVR
  }
  else if ( pu.cu->imv == 2 )
  {
    outputAffineMv[0].roundToPrecision( MV_PRECISION_INTERNAL, MV_PRECISION_INT );
    outputAffineMv[1].roundToPrecision( MV_PRECISION_INTERNAL, MV_PRECISION_INT );
    outputAffineMv[2].roundToPrecision( MV_PRECISION_INTERNAL, MV_PRECISION_INT );
  }
#endif

  if ( cornerMVPattern == 7 || (cornerMVPattern == 3 && pu.cu->affineType == AFFINEMODEL_4PARAM) )
  {
    affiAMVPInfo.mvCandLT[affiAMVPInfo.numCand] = outputAffineMv[0];
    affiAMVPInfo.mvCandRT[affiAMVPInfo.numCand] = outputAffineMv[1];
    affiAMVPInfo.mvCandLB[affiAMVPInfo.numCand] = outputAffineMv[2];
    affiAMVPInfo.numCand++;
  }


  if ( affiAMVPInfo.numCand < 2 )
  {
    // check corner MVs
    for ( int i = 2; i >= 0 && affiAMVPInfo.numCand < AMVP_MAX_NUM_CANDS; i-- )
    {
      if ( cornerMVPattern & (1 << i) ) // MV i exist
      {
        affiAMVPInfo.mvCandLT[affiAMVPInfo.numCand] = outputAffineMv[i];
        affiAMVPInfo.mvCandRT[affiAMVPInfo.numCand] = outputAffineMv[i];
        affiAMVPInfo.mvCandLB[affiAMVPInfo.numCand] = outputAffineMv[i];
        affiAMVPInfo.numCand++;
      }
    }

    // Get Temporal Motion Predictor
    if ( affiAMVPInfo.numCand < 2 && pu.cs->slice->getEnableTMVPFlag() )
    {
      const int refIdxCol = refIdx;

      Position posRB = pu.Y().bottomRight().offset( -3, -3 );

      const PreCalcValues& pcv = *pu.cs->pcv;

      Position posC0;
      bool C0Avail = false;
      Position posC1 = pu.Y().center();
#if JVET_M0170_MRG_SHARELIST
      bool C1Avail =  ( posC1.x  < pcv.lumaWidth ) && ( posC1.y < pcv.lumaHeight ) ;
#endif

      Mv cColMv;
      if ( ((posRB.x + pcv.minCUWidth) < pcv.lumaWidth) && ((posRB.y + pcv.minCUHeight) < pcv.lumaHeight) )
      {
        Position posInCtu( posRB.x & pcv.maxCUWidthMask, posRB.y & pcv.maxCUHeightMask );

        if ( (posInCtu.x + 4 < pcv.maxCUWidth) &&           // is not at the last column of CTU
          (posInCtu.y + 4 < pcv.maxCUHeight) )             // is not at the last row    of CTU
        {
          posC0 = posRB.offset( 4, 4 );
          C0Avail = true;
        }
        else if ( posInCtu.x + 4 < pcv.maxCUWidth )           // is not at the last column of CTU But is last row of CTU
        {
          // in the reference the CTU address is not set - thus probably resulting in no using this C0 possibility
          posC0 = posRB.offset( 4, 4 );
        }
        else if ( posInCtu.y + 4 < pcv.maxCUHeight )          // is not at the last row of CTU But is last column of CTU
        {
          posC0 = posRB.offset( 4, 4 );
          C0Avail = true;
        }
        else //is the right bottom corner of CTU
        {
          // same as for last column but not last row
          posC0 = posRB.offset( 4, 4 );
        }
      }

#if JVET_M0170_MRG_SHARELIST
      if ( (C0Avail && getColocatedMVP( pu, eRefPicList, posC0, cColMv, refIdxCol )) || (C1Avail && getColocatedMVP( pu, eRefPicList, posC1, cColMv, refIdxCol ) ) )
#else
      if ( (C0Avail && getColocatedMVP( pu, eRefPicList, posC0, cColMv, refIdxCol )) || getColocatedMVP( pu, eRefPicList, posC1, cColMv, refIdxCol ) )
#endif
      {
#if JVET_M0246_AFFINE_AMVR
        if ( pu.cu->imv == 0 )
        {
#endif
          cColMv.roundToPrecision(MV_PRECISION_INTERNAL, MV_PRECISION_QUARTER);
#if JVET_M0246_AFFINE_AMVR
        }
        else if ( pu.cu->imv == 2 )
        {
          cColMv.roundToPrecision( MV_PRECISION_INTERNAL, MV_PRECISION_INT );
        }
#endif
        affiAMVPInfo.mvCandLT[affiAMVPInfo.numCand] = cColMv;
        affiAMVPInfo.mvCandRT[affiAMVPInfo.numCand] = cColMv;
        affiAMVPInfo.mvCandLB[affiAMVPInfo.numCand] = cColMv;
        affiAMVPInfo.numCand++;
      }
    }

    if ( affiAMVPInfo.numCand < 2 )
    {
      // add zero MV
      for ( int i = affiAMVPInfo.numCand; i < AMVP_MAX_NUM_CANDS; i++ )
      {
        affiAMVPInfo.mvCandLT[affiAMVPInfo.numCand].setZero();
        affiAMVPInfo.mvCandRT[affiAMVPInfo.numCand].setZero();
        affiAMVPInfo.mvCandLB[affiAMVPInfo.numCand].setZero();
        affiAMVPInfo.numCand++;
      }
    }
  }

  for (int i = 0; i < affiAMVPInfo.numCand; i++)
  {
#if JVET_M0246_AFFINE_AMVR
    if ( pu.cu->imv != 1 )
    {
#endif
      affiAMVPInfo.mvCandLT[i].changePrecision(MV_PRECISION_INTERNAL, MV_PRECISION_QUARTER);
      affiAMVPInfo.mvCandRT[i].changePrecision(MV_PRECISION_INTERNAL, MV_PRECISION_QUARTER);
      affiAMVPInfo.mvCandLB[i].changePrecision(MV_PRECISION_INTERNAL, MV_PRECISION_QUARTER);
#if JVET_M0246_AFFINE_AMVR
    }
#endif
  }


}

#if JVET_M0483_IBC
bool PU::addIBCMVPCand(const PredictionUnit &pu, const Position &pos, const MvpDir &eDir, AMVPInfo &info)
{
  CodingStructure &cs = *pu.cs;
  const PredictionUnit *neibPU = NULL;
  Position neibPos;

  switch (eDir)
  {
  case MD_LEFT:
    neibPos = pos.offset(-1, 0);
    break;
  case MD_ABOVE:
    neibPos = pos.offset(0, -1);
    break;
  case MD_ABOVE_RIGHT:
    neibPos = pos.offset(1, -1);
    break;
  case MD_BELOW_LEFT:
    neibPos = pos.offset(-1, 1);
    break;
  case MD_ABOVE_LEFT:
    neibPos = pos.offset(-1, -1);
    break;
  default:
    break;
  }

  neibPU = cs.getPURestricted(neibPos, pu, pu.chType);

  if (neibPU == NULL || CU::isIBC(*neibPU->cu)==false)
  {
    return false;
  }

  const MotionInfo& neibMi = neibPU->getMotionInfo(neibPos);
  info.mvCand[info.numCand++] = neibMi.mv[REF_PIC_LIST_0];
  return true;
}
#endif

bool PU::addMVPCandUnscaled( const PredictionUnit &pu, const RefPicList &eRefPicList, const int &iRefIdx, const Position &pos, const MvpDir &eDir, AMVPInfo &info )
{
        CodingStructure &cs    = *pu.cs;
  const PredictionUnit *neibPU = NULL;
        Position neibPos;

  switch (eDir)
  {
  case MD_LEFT:
    neibPos = pos.offset( -1,  0 );
    break;
  case MD_ABOVE:
    neibPos = pos.offset(  0, -1 );
    break;
  case MD_ABOVE_RIGHT:
    neibPos = pos.offset(  1, -1 );
    break;
  case MD_BELOW_LEFT:
    neibPos = pos.offset( -1,  1 );
    break;
  case MD_ABOVE_LEFT:
    neibPos = pos.offset( -1, -1 );
    break;
  default:
    break;
  }

  neibPU = cs.getPURestricted( neibPos, pu, pu.chType );

  if( neibPU == NULL || !CU::isInter( *neibPU->cu ) )
  {
    return false;
  }

  const MotionInfo& neibMi        = neibPU->getMotionInfo( neibPos );

  const int        currRefPOC     = cs.slice->getRefPic( eRefPicList, iRefIdx )->getPOC();
  const RefPicList eRefPicList2nd = ( eRefPicList == REF_PIC_LIST_0 ) ? REF_PIC_LIST_1 : REF_PIC_LIST_0;

  for( int predictorSource = 0; predictorSource < 2; predictorSource++ ) // examine the indicated reference picture list, then if not available, examine the other list.
  {
    const RefPicList eRefPicListIndex = ( predictorSource == 0 ) ? eRefPicList : eRefPicList2nd;
    const int        neibRefIdx       = neibMi.refIdx[eRefPicListIndex];

    if( neibRefIdx >= 0 && currRefPOC == cs.slice->getRefPOC( eRefPicListIndex, neibRefIdx ) )
    {
      info.mvCand[info.numCand++] = neibMi.mv[eRefPicListIndex];
      return true;
    }
  }

  return false;
}

/**
* \param pInfo
* \param eRefPicList
* \param iRefIdx
* \param uiPartUnitIdx
* \param eDir
* \returns bool
*/
bool PU::addMVPCandWithScaling( const PredictionUnit &pu, const RefPicList &eRefPicList, const int &iRefIdx, const Position &pos, const MvpDir &eDir, AMVPInfo &info )
{
        CodingStructure &cs    = *pu.cs;
  const Slice &slice           = *cs.slice;
  const PredictionUnit *neibPU = NULL;
        Position neibPos;

  switch( eDir )
  {
  case MD_LEFT:
    neibPos = pos.offset( -1,  0 );
    break;
  case MD_ABOVE:
    neibPos = pos.offset(  0, -1 );
    break;
  case MD_ABOVE_RIGHT:
    neibPos = pos.offset(  1, -1 );
    break;
  case MD_BELOW_LEFT:
    neibPos = pos.offset( -1,  1 );
    break;
  case MD_ABOVE_LEFT:
    neibPos = pos.offset( -1, -1 );
    break;
  default:
    break;
  }

  neibPU = cs.getPURestricted( neibPos, pu, pu.chType );

#if JVET_M0483_IBC
  if (neibPU == NULL || !CU::isInter(*neibPU->cu) || !CU::isInter(*pu.cu))
#else
  if( neibPU == NULL || !CU::isInter( *neibPU->cu ) )
#endif
  {
    return false;
  }

  const MotionInfo& neibMi        = neibPU->getMotionInfo( neibPos );

  const RefPicList eRefPicList2nd = ( eRefPicList == REF_PIC_LIST_0 ) ? REF_PIC_LIST_1 : REF_PIC_LIST_0;

  const int  currPOC            = slice.getPOC();
  const int  currRefPOC         = slice.getRefPic( eRefPicList, iRefIdx )->poc;
  const bool bIsCurrRefLongTerm = slice.getRefPic( eRefPicList, iRefIdx )->longTerm;
  const int  neibPOC            = currPOC;

  for( int predictorSource = 0; predictorSource < 2; predictorSource++ ) // examine the indicated reference picture list, then if not available, examine the other list.
  {
    const RefPicList eRefPicListIndex = (predictorSource == 0) ? eRefPicList : eRefPicList2nd;
    const int        neibRefIdx       = neibMi.refIdx[eRefPicListIndex];
    if( neibRefIdx >= 0 )
    {
      const bool bIsNeibRefLongTerm = slice.getRefPic(eRefPicListIndex, neibRefIdx)->longTerm;

      if (bIsCurrRefLongTerm == bIsNeibRefLongTerm)
      {
        Mv cMv = neibMi.mv[eRefPicListIndex];

        if( !( bIsCurrRefLongTerm /* || bIsNeibRefLongTerm*/) )
        {
          const int neibRefPOC = slice.getRefPOC( eRefPicListIndex, neibRefIdx );
          const int scale      = xGetDistScaleFactor( currPOC, currRefPOC, neibPOC, neibRefPOC );

          if( scale != 4096 )
          {
            cMv = cMv.scaleMv( scale );
          }
        }

        info.mvCand[info.numCand++] = cMv;
        return true;
      }
    }
  }

  return false;
}

void PU::addAMVPHMVPCand(const PredictionUnit &pu, const RefPicList eRefPicList, const RefPicList eRefPicList2nd, const int currRefPOC, AMVPInfo &info, uint8_t imv)
{
  const Slice &slice = *(*pu.cs).slice;

  MotionInfo neibMi;
#if !JVET_M0117_AMVP_LIST_GEN
  int i = 0;
#endif
#if JVET_M0483_IBC
  int offset = CU::isIBC(*pu.cu) ? MAX_NUM_HMVP_CANDS : 0;
  int num_avai_candInLUT = CU::isIBC(*pu.cu) ? slice.getAvailableLUTIBCMrgNum() : slice.getAvailableLUTMrgNum();
#else
  int num_avai_candInLUT = slice.getAvailableLUTMrgNum();
#endif
  int num_allowedCand = std::min(MAX_NUM_HMVP_AVMPCANDS, num_avai_candInLUT);

  for (int mrgIdx = 1; mrgIdx <= num_allowedCand; mrgIdx++)
  {
    if (info.numCand >= AMVP_MAX_NUM_CANDS)
    {
      return;
    }
#if JVET_M0117_AMVP_LIST_GEN
#if JVET_M0483_IBC
    neibMi = slice.getMotionInfoFromLUTs(mrgIdx - 1 + offset) ;
#else
    neibMi = slice.getMotionInfoFromLUTs(mrgIdx - 1);
#endif
#else
#if JVET_M0483_IBC
    neibMi = slice.getMotionInfoFromLUTs(num_avai_candInLUT - mrgIdx + offset);
#else
    neibMi = slice.getMotionInfoFromLUTs(num_avai_candInLUT - mrgIdx);
#endif
#endif

    for (int predictorSource = 0; predictorSource < 2; predictorSource++)
    {
      const RefPicList eRefPicListIndex = (predictorSource == 0) ? eRefPicList : eRefPicList2nd;
      const int        neibRefIdx = neibMi.refIdx[eRefPicListIndex];

#if JVET_M0483_IBC
      if (neibRefIdx >= 0 && (CU::isIBC(*pu.cu) || (currRefPOC == slice.getRefPOC(eRefPicListIndex, neibRefIdx))))
#else
      if (neibRefIdx >= 0 && currRefPOC == slice.getRefPOC(eRefPicListIndex, neibRefIdx))
#endif
      {
        Mv pmv = neibMi.mv[eRefPicListIndex];
#if JVET_M0281_AMVP_ROUNDING || JVET_M0117_AMVP_LIST_GEN
        pmv.roundToAmvrSignalPrecision(MV_PRECISION_INTERNAL, pu.cu->imv);
#else
        if (imv != 0)
        {
          pmv.roundToAmvrSignalPrecision(MV_PRECISION_INTERNAL, imv);
        }
#endif

#if JVET_M0117_AMVP_LIST_GEN
        info.mvCand[info.numCand++] = pmv;
        if (info.numCand >= AMVP_MAX_NUM_CANDS)
        {
          return;
        }
#else
        for (i = 0; i < info.numCand; i++)
        {
          if (pmv == info.mvCand[i])
          {
            break;
          }
        }
        if (i == info.numCand)
        {
          info.mvCand[info.numCand++] = pmv;
          if (info.numCand >= AMVP_MAX_NUM_CANDS)
          {
            return;
          }
        }
#endif
      }
    }
  }
}

bool PU::isBipredRestriction(const PredictionUnit &pu)
{
  if(pu.cu->lumaSize().width == 4 && pu.cu->lumaSize().height ==4 )
  {
    return true;
  }
  return false;
}

void PU::getAffineControlPointCand( const PredictionUnit &pu, MotionInfo mi[4], bool isAvailable[4], int verIdx[4], int modelIdx, int verNum, AffineMergeCtx& affMrgType )
{
  int cuW = pu.Y().width;
  int cuH = pu.Y().height;
  int vx, vy;
  int shift = MAX_CU_DEPTH;
  int shiftHtoW = shift + g_aucLog2[cuW] - g_aucLog2[cuH];

  // motion info
  Mv cMv[2][4];
  int refIdx[2] = { -1, -1 };
  int dir = 0;
  EAffineModel curType = (verNum == 2) ? AFFINEMODEL_4PARAM : AFFINEMODEL_6PARAM;

  if ( verNum == 2 )
  {
    int idx0 = verIdx[0], idx1 = verIdx[1];
    if ( !isAvailable[idx0] || !isAvailable[idx1] )
    {
      return;
    }

    for ( int l = 0; l < 2; l++ )
    {
      if ( mi[idx0].refIdx[l] >= 0 && mi[idx1].refIdx[l] >= 0 )
      {
        // check same refidx and different mv
#if JVET_M0228_REMOVE_CPMV_COMPARE
        if ( mi[idx0].refIdx[l] == mi[idx1].refIdx[l])
#else
        if ( mi[idx0].refIdx[l] == mi[idx1].refIdx[l] && mi[idx0].mv[l] != mi[idx1].mv[l] )
#endif
        {
          dir |= (l + 1);
          refIdx[l] = mi[idx0].refIdx[l];
        }
      }
    }
  }
  else if ( verNum == 3 )
  {
    int idx0 = verIdx[0], idx1 = verIdx[1], idx2 = verIdx[2];
    if ( !isAvailable[idx0] || !isAvailable[idx1] || !isAvailable[idx2] )
    {
      return;
    }

    for ( int l = 0; l < 2; l++ )
    {
      if ( mi[idx0].refIdx[l] >= 0 && mi[idx1].refIdx[l] >= 0 && mi[idx2].refIdx[l] >= 0 )
      {
        // check same refidx and different mv
#if JVET_M0228_REMOVE_CPMV_COMPARE
        if ( mi[idx0].refIdx[l] == mi[idx1].refIdx[l] && mi[idx0].refIdx[l] == mi[idx2].refIdx[l])
#else
        if ( mi[idx0].refIdx[l] == mi[idx1].refIdx[l] && mi[idx0].refIdx[l] == mi[idx2].refIdx[l] && (mi[idx0].mv[l] != mi[idx1].mv[l] || mi[idx0].mv[l] != mi[idx2].mv[l]) )
#endif
        {
          dir |= (l + 1);
          refIdx[l] = mi[idx0].refIdx[l];
        }
      }
    }
  }

  if ( dir == 0 )
  {
    return;
  }


  for ( int l = 0; l < 2; l++ )
  {
    if ( dir & (l + 1) )
    {
      for ( int i = 0; i < verNum; i++ )
      {
        cMv[l][verIdx[i]] = mi[verIdx[i]].mv[l];
      }

      // convert to LT, RT[, [LB]]
      switch ( modelIdx )
      {
      case 0: // 0 : LT, RT, LB
        break;

      case 1: // 1 : LT, RT, RB
        cMv[l][2].hor = cMv[l][3].hor + cMv[l][0].hor - cMv[l][1].hor;
        cMv[l][2].ver = cMv[l][3].ver + cMv[l][0].ver - cMv[l][1].ver;
        break;

      case 2: // 2 : LT, LB, RB
        cMv[l][1].hor = cMv[l][3].hor + cMv[l][0].hor - cMv[l][2].hor;
        cMv[l][1].ver = cMv[l][3].ver + cMv[l][0].ver - cMv[l][2].ver;
        break;

      case 3: // 3 : RT, LB, RB
        cMv[l][0].hor = cMv[l][1].hor + cMv[l][2].hor - cMv[l][3].hor;
        cMv[l][0].ver = cMv[l][1].ver + cMv[l][2].ver - cMv[l][3].ver;
        break;

      case 4: // 4 : LT, RT
        break;

      case 5: // 5 : LT, LB
        vx = (cMv[l][0].hor << shift) + ((cMv[l][2].ver - cMv[l][0].ver) << shiftHtoW);
        vy = (cMv[l][0].ver << shift) - ((cMv[l][2].hor - cMv[l][0].hor) << shiftHtoW);
        roundAffineMv( vx, vy, shift );
        cMv[l][1].set( vx, vy );
        break;

      default:
        CHECK( 1, "Invalid model index!\n" );
        break;
      }
    }
    else
    {
      for ( int i = 0; i < 4; i++ )
      {
        cMv[l][i].hor = 0;
        cMv[l][i].ver = 0;
      }
    }
  }

  for ( int i = 0; i < 3; i++ )
  {
    affMrgType.mvFieldNeighbours[(affMrgType.numValidMergeCand << 1) + 0][i].mv = cMv[0][i];
    affMrgType.mvFieldNeighbours[(affMrgType.numValidMergeCand << 1) + 0][i].refIdx = refIdx[0];

    affMrgType.mvFieldNeighbours[(affMrgType.numValidMergeCand << 1) + 1][i].mv = cMv[1][i];
    affMrgType.mvFieldNeighbours[(affMrgType.numValidMergeCand << 1) + 1][i].refIdx = refIdx[1];
  }
  affMrgType.interDirNeighbours[affMrgType.numValidMergeCand] = dir;
  affMrgType.affineType[affMrgType.numValidMergeCand] = curType;
  affMrgType.numValidMergeCand++;


  return;
}

const int getAvailableAffineNeighboursForLeftPredictor( const PredictionUnit &pu, const PredictionUnit* npu[] )
{
  const Position posLB = pu.Y().bottomLeft();
  int num = 0;

  const PredictionUnit *puLeftBottom = pu.cs->getPURestricted( posLB.offset( -1, 1 ), pu, pu.chType );
  if ( puLeftBottom && puLeftBottom->cu->affine
    && puLeftBottom->mergeType == MRG_TYPE_DEFAULT_N
    )
  {
    npu[num++] = puLeftBottom;
    return num;
  }

  const PredictionUnit* puLeft = pu.cs->getPURestricted( posLB.offset( -1, 0 ), pu, pu.chType );
  if ( puLeft && puLeft->cu->affine
    && puLeft->mergeType == MRG_TYPE_DEFAULT_N
    )
  {
    npu[num++] = puLeft;
    return num;
  }

  return num;
}

const int getAvailableAffineNeighboursForAbovePredictor( const PredictionUnit &pu, const PredictionUnit* npu[], int numAffNeighLeft )
{
  const Position posLT = pu.Y().topLeft();
  const Position posRT = pu.Y().topRight();
  int num = numAffNeighLeft;

  const PredictionUnit* puAboveRight = pu.cs->getPURestricted( posRT.offset( 1, -1 ), pu, pu.chType );
  if ( puAboveRight && puAboveRight->cu->affine
    && puAboveRight->mergeType == MRG_TYPE_DEFAULT_N
    )
  {
    npu[num++] = puAboveRight;
    return num;
  }

  const PredictionUnit* puAbove = pu.cs->getPURestricted( posRT.offset( 0, -1 ), pu, pu.chType );
  if ( puAbove && puAbove->cu->affine
    && puAbove->mergeType == MRG_TYPE_DEFAULT_N
    )
  {
    npu[num++] = puAbove;
    return num;
  }

  const PredictionUnit *puAboveLeft = pu.cs->getPURestricted( posLT.offset( -1, -1 ), pu, pu.chType );
  if ( puAboveLeft && puAboveLeft->cu->affine
    && puAboveLeft->mergeType == MRG_TYPE_DEFAULT_N
    )
  {
    npu[num++] = puAboveLeft;
    return num;
  }

  return num;
}

void PU::getAffineMergeCand( const PredictionUnit &pu, AffineMergeCtx& affMrgCtx, const int mrgCandIdx )
{
  const CodingStructure &cs = *pu.cs;
  const Slice &slice = *pu.cs->slice;
  const uint32_t maxNumAffineMergeCand = slice.getMaxNumAffineMergeCand();

  for ( int i = 0; i < maxNumAffineMergeCand; i++ )
  {
    for ( int mvNum = 0; mvNum < 3; mvNum++ )
    {
      affMrgCtx.mvFieldNeighbours[(i << 1) + 0][mvNum].setMvField( Mv(), -1 );
      affMrgCtx.mvFieldNeighbours[(i << 1) + 1][mvNum].setMvField( Mv(), -1 );
    }
    affMrgCtx.interDirNeighbours[i] = 0;
    affMrgCtx.affineType[i] = AFFINEMODEL_4PARAM;
    affMrgCtx.mergeType[i] = MRG_TYPE_DEFAULT_N;
    affMrgCtx.GBiIdx[i] = GBI_DEFAULT;
  }

  affMrgCtx.numValidMergeCand = 0;
  affMrgCtx.maxNumMergeCand = maxNumAffineMergeCand;

  bool enableSubPuMvp = slice.getSPS()->getSBTMVPEnabledFlag() && !(slice.getPOC() == slice.getRefPic(REF_PIC_LIST_0, 0)->getPOC() && slice.isIRAP());
  bool isAvailableSubPu = false;
  if ( enableSubPuMvp && slice.getEnableTMVPFlag() )
  {
#if !JVET_M0409_ATMVP_FIX && JVET_M0483_IBC==0
    int  cntIBC = 0;
#endif
    MergeCtx mrgCtx = *affMrgCtx.mrgCtx;
    bool tmpLICFlag = false;

    CHECK( mrgCtx.subPuMvpMiBuf.area() == 0 || !mrgCtx.subPuMvpMiBuf.buf, "Buffer not initialized" );
    mrgCtx.subPuMvpMiBuf.fill( MotionInfo() );

    int pos = 0;
    // Get spatial MV
#if JVET_M0116_ATMVP_LEFT_NB_FOR_OFFSET
    const Position posCurLB = pu.Y().bottomLeft();
    MotionInfo miLeft;
#else
    const Position posCurRT = pu.Y().topRight();
    const Position posCurLB = pu.Y().bottomLeft();
    MotionInfo miAbove, miLeft, miAboveRight, miBelowLeft;
#endif

    //left
    const PredictionUnit* puLeft = cs.getPURestricted( posCurLB.offset( -1, 0 ), pu, pu.chType );
    const bool isAvailableA1 = puLeft && isDiffMER( pu, *puLeft ) && pu.cu != puLeft->cu && CU::isInter( *puLeft->cu );
    if ( isAvailableA1 )
    {
      miLeft = puLeft->getMotionInfo( posCurLB.offset( -1, 0 ) );
      // get Inter Dir
      mrgCtx.interDirNeighbours[pos] = miLeft.interDir;

      // get Mv from Left
#if !JVET_M0409_ATMVP_FIX && JVET_M0483_IBC==0
      if (puLeft->cu->ibc)
      {
        cntIBC++;
      }
#endif
      mrgCtx.mvFieldNeighbours[pos << 1].setMvField( miLeft.mv[0], miLeft.refIdx[0] );

      if ( slice.isInterB() )
      {
        mrgCtx.mvFieldNeighbours[(pos << 1) + 1].setMvField( miLeft.mv[1], miLeft.refIdx[1] );
      }
      pos++;
    }

#if !JVET_M0116_ATMVP_LEFT_NB_FOR_OFFSET
    // above
    const PredictionUnit *puAbove = cs.getPURestricted( posCurRT.offset( 0, -1 ), pu, pu.chType );
    bool isAvailableB1 = puAbove && isDiffMER( pu, *puAbove ) && pu.cu != puAbove->cu && CU::isInter( *puAbove->cu );
    if ( isAvailableB1 )
    {
      miAbove = puAbove->getMotionInfo( posCurRT.offset( 0, -1 ) );

      if ( !isAvailableA1 || (miAbove != miLeft) )
      {
        // get Inter Dir
        mrgCtx.interDirNeighbours[pos] = miAbove.interDir;
        // get Mv from Left
#if !JVET_M0409_ATMVP_FIX && JVET_M0483_IBC==0
        if (puAbove->cu->ibc)
        {
          cntIBC++;
        }
#endif
        mrgCtx.mvFieldNeighbours[pos << 1].setMvField( miAbove.mv[0], miAbove.refIdx[0] );

        if ( slice.isInterB() )
        {
          mrgCtx.mvFieldNeighbours[(pos << 1) + 1].setMvField( miAbove.mv[1], miAbove.refIdx[1] );
        }

        pos++;
      }
    }

    // above right
    const PredictionUnit *puAboveRight = cs.getPURestricted( posCurRT.offset( 1, -1 ), pu, pu.chType );
    bool isAvailableB0 = puAboveRight && isDiffMER( pu, *puAboveRight ) && CU::isInter( *puAboveRight->cu );
    if ( isAvailableB0 )
    {
      miAboveRight = puAboveRight->getMotionInfo( posCurRT.offset( 1, -1 ) );

#if HM_JEM_MERGE_CANDS
      if ( (!isAvailableB1 || (miAbove != miAboveRight)) && (!isAvailableA1 || (miLeft != miAboveRight)) )
#else
      if ( !isAvailableB1 || (miAbove != miAboveRight) )
#endif
      {
        // get Inter Dir
        mrgCtx.interDirNeighbours[pos] = miAboveRight.interDir;
        // get Mv from Left
#if !JVET_M0409_ATMVP_FIX && JVET_M0483_IBC==0
        if (puAboveRight->cu->ibc)
        {
          cntIBC++;
        }
#endif
        mrgCtx.mvFieldNeighbours[pos << 1].setMvField( miAboveRight.mv[0], miAboveRight.refIdx[0] );

        if ( slice.isInterB() )
        {
          mrgCtx.mvFieldNeighbours[(pos << 1) + 1].setMvField( miAboveRight.mv[1], miAboveRight.refIdx[1] );
        }

        pos++;
      }
    }

    //left bottom
    const PredictionUnit *puLeftBottom = cs.getPURestricted( posCurLB.offset( -1, 1 ), pu, pu.chType );
    bool isAvailableA0 = puLeftBottom && isDiffMER( pu, *puLeftBottom ) && CU::isInter( *puLeftBottom->cu );
    if ( isAvailableA0 )
    {
      miBelowLeft = puLeftBottom->getMotionInfo( posCurLB.offset( -1, 1 ) );

#if HM_JEM_MERGE_CANDS
      if ( (!isAvailableA1 || (miBelowLeft != miLeft)) && (!isAvailableB1 || (miBelowLeft != miAbove)) && (!isAvailableB0 || (miBelowLeft != miAboveRight)) )
#else
      if ( !isAvailableA1 || (miBelowLeft != miLeft) )
#endif
      {
        // get Inter Dir
        mrgCtx.interDirNeighbours[pos] = miBelowLeft.interDir;
        // get Mv from Bottom-Left
#if !JVET_M0409_ATMVP_FIX && JVET_M0483_IBC==0
        if (puLeftBottom->cu->ibc)
        {
          cntIBC++;
        }
#endif
        mrgCtx.mvFieldNeighbours[pos << 1].setMvField( miBelowLeft.mv[0], miBelowLeft.refIdx[0] );

        if ( slice.isInterB() )
        {
          mrgCtx.mvFieldNeighbours[(pos << 1) + 1].setMvField( miBelowLeft.mv[1], miBelowLeft.refIdx[1] );
        }
        pos++;
      }
    }
#endif
    mrgCtx.numValidMergeCand = pos;

    isAvailableSubPu = getInterMergeSubPuMvpCand( pu, mrgCtx, tmpLICFlag, pos
      , 0
#if !JVET_M0409_ATMVP_FIX && JVET_M0483_IBC==0
      , cntIBC
#endif
    );
    if ( isAvailableSubPu )
    {
      for ( int mvNum = 0; mvNum < 3; mvNum++ )
      {
        affMrgCtx.mvFieldNeighbours[(affMrgCtx.numValidMergeCand << 1) + 0][mvNum].setMvField( mrgCtx.mvFieldNeighbours[(pos << 1) + 0].mv, mrgCtx.mvFieldNeighbours[(pos << 1) + 0].refIdx );
        affMrgCtx.mvFieldNeighbours[(affMrgCtx.numValidMergeCand << 1) + 1][mvNum].setMvField( mrgCtx.mvFieldNeighbours[(pos << 1) + 1].mv, mrgCtx.mvFieldNeighbours[(pos << 1) + 1].refIdx );
      }
      affMrgCtx.interDirNeighbours[affMrgCtx.numValidMergeCand] = mrgCtx.interDirNeighbours[pos];

      affMrgCtx.affineType[affMrgCtx.numValidMergeCand] = AFFINE_MODEL_NUM;
      affMrgCtx.mergeType[affMrgCtx.numValidMergeCand] = MRG_TYPE_SUBPU_ATMVP;
      if ( affMrgCtx.numValidMergeCand == mrgCandIdx )
      {
        return;
      }

      affMrgCtx.numValidMergeCand++;

      // early termination
      if ( affMrgCtx.numValidMergeCand == maxNumAffineMergeCand )
      {
        return;
      }
    }
  }

  if ( slice.getSPS()->getUseAffine() )
  {
    ///> Start: inherited affine candidates
    const PredictionUnit* npu[5];
    int numAffNeighLeft = getAvailableAffineNeighboursForLeftPredictor( pu, npu );
    int numAffNeigh = getAvailableAffineNeighboursForAbovePredictor( pu, npu, numAffNeighLeft );
    for ( int idx = 0; idx < numAffNeigh; idx++ )
    {
      // derive Mv from Neigh affine PU
      Mv cMv[2][3];
      const PredictionUnit* puNeigh = npu[idx];
      pu.cu->affineType = puNeigh->cu->affineType;