UnitTools.cpp

      curNbPred = nbPred;
      for (uint32_t idx = 0; idx < curNbPred && nbPred < IBC_NUM_CANDIDATES; idx++)
      {
        if (!isBvCandDerived[idx])
        {
          Mv derivedBv;
          if (getDerivedBV(pu, mvPred[idx], derivedBv))
          {
            if (isAddNeighborMv(derivedBv, mvPred, nbPred))
            {
              mvPred[nbPred++] = derivedBv;
            }
          }
          isBvCandDerived[idx] = true;
        }
      }
    } while (nbPred > curNbPred && nbPred < IBC_NUM_CANDIDATES);
  }
}

bool PU::getDerivedBV(PredictionUnit &pu, const Mv& currentMv, Mv& derivedMv)
{
  int   cuPelX = pu.lumaPos().x;
  int   cuPelY = pu.lumaPos().y;
  int rX = cuPelX + currentMv.getHor();
  int rY = cuPelY + currentMv.getVer();
  int offsetX = currentMv.getHor();
  int offsetY = currentMv.getVer();


  if (rX < 0 || rY < 0 || rX >= pu.cs->slice->getSPS()->getPicWidthInLumaSamples() || rY >= pu.cs->slice->getSPS()->getPicHeightInLumaSamples())
  {
    return false;
  }

  const PredictionUnit *neibRefPU = NULL;
  neibRefPU = pu.cs->getPURestricted(pu.lumaPos().offset(offsetX, offsetY), pu, CHANNEL_TYPE_LUMA);

  bool isIBC = (neibRefPU) ? CU::isIBC(*neibRefPU->cu) : 0;
  if (isIBC)
  {
    derivedMv = neibRefPU->bv;
    derivedMv += currentMv;
  }
  return isIBC;
}

/**
 * Constructs a list of candidates for IBC AMVP (See specification, section "Derivation process for motion vector predictor candidates")
 */
void PU::fillIBCMvpCand(PredictionUnit &pu, AMVPInfo &amvpInfo)
{

  AMVPInfo *pInfo = &amvpInfo;

  pInfo->numCand = 0;


  MergeCtx mergeCtx;
  PU::getIBCMergeCandidates(pu, mergeCtx, AMVP_MAX_NUM_CANDS - 1);
  int candIdx = 0;
  while (pInfo->numCand < AMVP_MAX_NUM_CANDS)
  {
    pInfo->mvCand[pInfo->numCand] = mergeCtx.mvFieldNeighbours[(candIdx << 1) + 0].mv;;
    pInfo->numCand++;
    candIdx++;
  }

  for (Mv &mv : pInfo->mvCand)
  {
    mv.roundIbcPrecInternal2Amvr(pu.cu->imv);
  }
}


/** Constructs a list of candidates for AMVP (See specification, section "Derivation process for motion vector predictor candidates")
* \param uiPartIdx
* \param uiPartAddr
* \param eRefPicList
* \param iRefIdx
* \param pInfo
*/
void PU::fillMvpCand(PredictionUnit &pu, const RefPicList &eRefPicList, const int &refIdx, AMVPInfo &amvpInfo)
{
  CodingStructure &cs = *pu.cs;

  AMVPInfo *pInfo = &amvpInfo;

  pInfo->numCand = 0;

  if (refIdx < 0)
  {
    return;
  }

  //-- Get Spatial MV
  Position posLT = pu.Y().topLeft();
  Position posRT = pu.Y().topRight();
  Position posLB = pu.Y().bottomLeft();

  bool isScaledFlagLX = false; /// variable name from specification; true when the PUs below left or left are available (availableA0 || availableA1).

  {
    const PredictionUnit* tmpPU = cs.getPURestricted( posLB.offset( -1, 1 ), pu, pu.chType ); // getPUBelowLeft(idx, partIdxLB);
    isScaledFlagLX = tmpPU != NULL && CU::isInter( *tmpPU->cu );

    if( !isScaledFlagLX )
    {
      tmpPU = cs.getPURestricted( posLB.offset( -1, 0 ), pu, pu.chType );
      isScaledFlagLX = tmpPU != NULL && CU::isInter( *tmpPU->cu );
    }
  }

  // Left predictor search
  if( isScaledFlagLX )
  {
    bool bAdded = addMVPCandUnscaled( pu, eRefPicList, refIdx, posLB, MD_BELOW_LEFT, *pInfo );

    if( !bAdded )
    {
      bAdded = addMVPCandUnscaled( pu, eRefPicList, refIdx, posLB, MD_LEFT, *pInfo );

      if( !bAdded )
      {
        bAdded = addMVPCandWithScaling( pu, eRefPicList, refIdx, posLB, MD_BELOW_LEFT, *pInfo );

        if( !bAdded )
        {
          addMVPCandWithScaling( pu, eRefPicList, refIdx, posLB, MD_LEFT, *pInfo );
        }
      }
    }
  }

  // Above predictor search
  {
    bool bAdded = addMVPCandUnscaled( pu, eRefPicList, refIdx, posRT, MD_ABOVE_RIGHT, *pInfo );

    if( !bAdded )
    {
      bAdded = addMVPCandUnscaled( pu, eRefPicList, refIdx, posRT, MD_ABOVE, *pInfo );

      if( !bAdded )
      {
        addMVPCandUnscaled( pu, eRefPicList, refIdx, posLT, MD_ABOVE_LEFT, *pInfo );
      }
    }
  }

  if( !isScaledFlagLX )
  {
    bool bAdded = addMVPCandWithScaling( pu, eRefPicList, refIdx, posRT, MD_ABOVE_RIGHT, *pInfo );

    if( !bAdded )
    {
      bAdded = addMVPCandWithScaling( pu, eRefPicList, refIdx, posRT, MD_ABOVE, *pInfo );

      if( !bAdded )
      {
        addMVPCandWithScaling( pu, eRefPicList, refIdx, posLT, MD_ABOVE_LEFT, *pInfo );
      }
    }
  }

  for( int i = 0; i < pInfo->numCand; i++ )
  {
    pInfo->mvCand[i].roundTransPrecInternal2Amvr(pu.cu->imv);
  }

  if( pInfo->numCand == 2 )
  {
    if( pInfo->mvCand[0] == pInfo->mvCand[1] )
    {
      pInfo->numCand = 1;
    }
  }

  if (cs.slice->getEnableTMVPFlag() && pInfo->numCand < AMVP_MAX_NUM_CANDS && (pu.lumaSize().width + pu.lumaSize().height > 12))
  {
    // Get Temporal Motion Predictor
    const int refIdx_Col = refIdx;

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

    const PreCalcValues& pcv = *cs.pcv;

    Position posC0;
    bool C0Avail = false;
    Position posC1 = pu.Y().center();
    Mv cColMv;

    if( ( ( posRB.x + pcv.minCUWidth ) < pcv.lumaWidth ) && ( ( posRB.y + pcv.minCUHeight ) < pcv.lumaHeight ) )
    {
      int posYInCtu = posRB.y & pcv.maxCUHeightMask;
      if (posYInCtu + 4 < pcv.maxCUHeight)
      {
        posC0 = posRB.offset(4, 4);
        C0Avail = true;
      }
    }
    if ( ( C0Avail && getColocatedMVP( pu, eRefPicList, posC0, cColMv, refIdx_Col ) ) || getColocatedMVP( pu, eRefPicList, posC1, cColMv, refIdx_Col ) )
    {
      cColMv.roundTransPrecInternal2Amvr(pu.cu->imv);
      pInfo->mvCand[pInfo->numCand++] = cColMv;
    }
  }

  if (pInfo->numCand < AMVP_MAX_NUM_CANDS)
  {
    const int        currRefPOC = cs.slice->getRefPic(eRefPicList, refIdx)->getPOC();
    const RefPicList eRefPicList2nd = (eRefPicList == REF_PIC_LIST_0) ? REF_PIC_LIST_1 : REF_PIC_LIST_0;
    addAMVPHMVPCand(pu, eRefPicList, eRefPicList2nd, currRefPOC, *pInfo, pu.cu->imv);
  }

  if (pInfo->numCand > AMVP_MAX_NUM_CANDS)
  {
    pInfo->numCand = AMVP_MAX_NUM_CANDS;
  }

  while (pInfo->numCand < AMVP_MAX_NUM_CANDS)
  {
    pInfo->mvCand[pInfo->numCand] = Mv( 0, 0 );
    pInfo->numCand++;
  }

  for (Mv &mv : pInfo->mvCand)
  {
    mv.roundTransPrecInternal2Amvr(pu.cu->imv);
  }
}

bool PU::addAffineMVPCandUnscaled( const PredictionUnit &pu, const RefPicList &refPicList, const int &refIdx, const Position &pos, const MvpDir &dir, AffineAMVPInfo &affiAMVPInfo )
{
  CodingStructure &cs = *pu.cs;
  const PredictionUnit *neibPU = NULL;
  Position neibPos;

  switch ( dir )
  {
  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 ) || !neibPU->cu->affine
    || neibPU->mergeType != MRG_TYPE_DEFAULT_N
    )
  {
    return false;
  }

  Mv outputAffineMv[3];
  const MotionInfo& neibMi = neibPU->getMotionInfo( neibPos );

  const int        currRefPOC = cs.slice->getRefPic( refPicList, refIdx )->getPOC();
  const RefPicList refPicList2nd = (refPicList == 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) ? refPicList : refPicList2nd;
    const int        neibRefIdx = neibMi.refIdx[eRefPicListIndex];

    if ( ((neibPU->interDir & (eRefPicListIndex + 1)) == 0) || pu.cu->slice->getRefPOC( eRefPicListIndex, neibRefIdx ) != currRefPOC )
    {
      continue;
    }

    xInheritedAffineMv( pu, neibPU, eRefPicListIndex, outputAffineMv );
    outputAffineMv[0].roundAffinePrecInternal2Amvr(pu.cu->imv);
    outputAffineMv[1].roundAffinePrecInternal2Amvr(pu.cu->imv);
    affiAMVPInfo.mvCandLT[affiAMVPInfo.numCand] = outputAffineMv[0];
    affiAMVPInfo.mvCandRT[affiAMVPInfo.numCand] = outputAffineMv[1];
    if ( pu.cu->affineType == AFFINEMODEL_6PARAM )
    {
      outputAffineMv[2].roundAffinePrecInternal2Amvr(pu.cu->imv);
      affiAMVPInfo.mvCandLB[affiAMVPInfo.numCand] = outputAffineMv[2];
    }
    affiAMVPInfo.numCand++;
    return true;
  }

  return false;
}

void PU::xInheritedAffineMv( const PredictionUnit &pu, const PredictionUnit* puNeighbour, RefPicList eRefPicList, Mv rcMv[3] )
{
  int posNeiX = puNeighbour->Y().pos().x;
  int posNeiY = puNeighbour->Y().pos().y;
  int posCurX = pu.Y().pos().x;
  int posCurY = pu.Y().pos().y;

  int neiW = puNeighbour->Y().width;
  int curW = pu.Y().width;
  int neiH = puNeighbour->Y().height;
  int curH = pu.Y().height;

  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;
  rcMv[0].clipToStorageBitDepth();

  // 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;
  rcMv[1].clipToStorageBitDepth();

  // 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;
    rcMv[2].clipToStorageBitDepth();
  }
}


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++)
    {
      affiAMVPInfo.mvCandLT[i].roundAffinePrecInternal2Amvr(pu.cu->imv);
      affiAMVPInfo.mvCandRT[i].roundAffinePrecInternal2Amvr(pu.cu->imv);
      affiAMVPInfo.mvCandLB[i].roundAffinePrecInternal2Amvr(pu.cu->imv);
    }
    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];

  outputAffineMv[0].roundAffinePrecInternal2Amvr(pu.cu->imv);
  outputAffineMv[1].roundAffinePrecInternal2Amvr(pu.cu->imv);
  outputAffineMv[2].roundAffinePrecInternal2Amvr(pu.cu->imv);

  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();
      Mv cColMv;
      if ( ((posRB.x + pcv.minCUWidth) < pcv.lumaWidth) && ((posRB.y + pcv.minCUHeight) < pcv.lumaHeight) )
      {  
        int posYInCtu = posRB.y & pcv.maxCUHeightMask;
        if (posYInCtu + 4 < pcv.maxCUHeight)
        {
          posC0 = posRB.offset(4, 4);
          C0Avail = true;
        }
      }
      if ( ( C0Avail && getColocatedMVP( pu, eRefPicList, posC0, cColMv, refIdxCol ) ) || getColocatedMVP( pu, eRefPicList, posC1, cColMv, refIdxCol ) )
      {
        cColMv.roundAffinePrecInternal2Amvr(pu.cu->imv);
        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++)
  {
    affiAMVPInfo.mvCandLT[i].roundAffinePrecInternal2Amvr(pu.cu->imv);
    affiAMVPInfo.mvCandRT[i].roundAffinePrecInternal2Amvr(pu.cu->imv);
    affiAMVPInfo.mvCandLB[i].roundAffinePrecInternal2Amvr(pu.cu->imv);
  }
}

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;
}

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 (neibPU == NULL || !CU::isInter(*neibPU->cu) || !CU::isInter(*pu.cu))
  {
    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;
  auto &lut = CU::isIBC(*pu.cu) ? pu.cs->motionLut.lutIbc : pu.cs->motionLut.lut;
  int num_avai_candInLUT = (int) lut.size();
  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;
    }
    neibMi = lut[mrgIdx - 1];

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

      if (neibRefIdx >= 0 && (CU::isIBC(*pu.cu) || (currRefPOC == slice.getRefPOC(eRefPicListIndex, neibRefIdx))))
      {
        Mv pmv = neibMi.mv[eRefPicListIndex];
        pmv.roundTransPrecInternal2Amvr(pu.cu->imv);

        info.mvCand[info.numCand++] = pmv;
        if (info.numCand >= AMVP_MAX_NUM_CANDS)
        {
          return;
        }
      }
    }
  }
}

bool PU::isBipredRestriction(const PredictionUnit &pu)
{
  if(pu.cu->lumaSize().width == 4 && pu.cu->lumaSize().height ==4 )
  {
    return true;
  }
  /* disable bi-prediction for 4x8/8x4 */
  if ( pu.cu->lumaSize().width + pu.cu->lumaSize().height == 12 )
  {
    return true;
  }
  return false;
}
void PU::getAffineControlPointCand(const PredictionUnit &pu, MotionInfo mi[4], int8_t neighGbi[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;
  int8_t gbiIdx = GBI_DEFAULT;
  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 ( mi[idx0].refIdx[l] == mi[idx1].refIdx[l])
        {
          dir |= (l + 1);
          refIdx[l] = mi[idx0].refIdx[l];
        }
      }
    }
    if (dir == 3)
    {
      if (neighGbi[idx0] == neighGbi[idx1])
      {
        gbiIdx = neighGbi[idx0];
      }
    }

  }
  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 ( mi[idx0].refIdx[l] == mi[idx1].refIdx[l] && mi[idx0].refIdx[l] == mi[idx2].refIdx[l])
        {
          dir |= (l + 1);
          refIdx[l] = mi[idx0].refIdx[l];
        }
      }
    }
    int gbiClass[5] = { -1,0,0,0,1 };
    if (dir == 3)
    {
      if (neighGbi[idx0] == neighGbi[idx1] && gbiClass[neighGbi[idx0]] == gbiClass[neighGbi[idx2]])
      {
        gbiIdx = neighGbi[idx0];
      }
      else if (neighGbi[idx0] == neighGbi[idx2] && gbiClass[neighGbi[idx0]] == gbiClass[neighGbi[idx1]])
      {
        gbiIdx = neighGbi[idx0];

      }
      else if (neighGbi[idx1] == neighGbi[idx2] && gbiClass[neighGbi[idx0]] == gbiClass[neighGbi[idx1]])
      {
        gbiIdx = neighGbi[idx1];
      }
      else
      {
        gbiIdx = GBI_DEFAULT;
      }

    }

  }

  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;
        cMv[l][2].clipToStorageBitDepth();
        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;
        cMv[l][1].clipToStorageBitDepth();
        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;
        cMv[l][0].clipToStorageBitDepth();
        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 );
        cMv[l][1].clipToStorageBitDepth();
        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.GBiIdx[affMrgType.numValidMergeCand] = gbiIdx;
  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
    )
  {