source: SHVCSoftware/branches/SHM-1.0-dev/source/Lib/TLibCommon/TComPrediction.cpp @ 567

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

#include <memory.h>
#include "TComPrediction.h"

//! \ingroup TLibCommon
//! \{

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

TComPrediction::TComPrediction()
: m_pLumaRecBuffer(0)
, m_iLumaRecStride(0)
{
  m_piYuvExt = NULL;
}

TComPrediction::~TComPrediction()
{
  
  delete[] m_piYuvExt;

  m_acYuvPred[0].destroy();
  m_acYuvPred[1].destroy();

  m_cYuvPredTemp.destroy();

  if( m_pLumaRecBuffer )
  {
    delete [] m_pLumaRecBuffer;
  }
  
  Int i, j;
  for (i = 0; i < 4; i++)
  {
    for (j = 0; j < 4; j++)
    {
      m_filteredBlock[i][j].destroy();
    }
    m_filteredBlockTmp[i].destroy();
  }
}

Void TComPrediction::initTempBuff()
{
  if( m_piYuvExt == NULL )
  {
    Int extWidth  = g_uiMaxCUWidth + 16; 
    Int extHeight = g_uiMaxCUHeight + 1;
    Int i, j;
    for (i = 0; i < 4; i++)
    {
      m_filteredBlockTmp[i].create(extWidth, extHeight + 7);
      for (j = 0; j < 4; j++)
      {
        m_filteredBlock[i][j].create(extWidth, extHeight);
      }
    }
    m_iYuvExtHeight  = ((g_uiMaxCUHeight + 2) << 4);
    m_iYuvExtStride = ((g_uiMaxCUWidth  + 8) << 4);
    m_piYuvExt = new Int[ m_iYuvExtStride * m_iYuvExtHeight ];

    // new structure
    m_acYuvPred[0] .create( g_uiMaxCUWidth, g_uiMaxCUHeight );
    m_acYuvPred[1] .create( g_uiMaxCUWidth, g_uiMaxCUHeight );

    m_cYuvPredTemp.create( g_uiMaxCUWidth, g_uiMaxCUHeight );
  }

  if (m_iLumaRecStride != (g_uiMaxCUWidth>>1) + 1)
  {
    m_iLumaRecStride =  (g_uiMaxCUWidth>>1) + 1;
    if (!m_pLumaRecBuffer)
    {
      m_pLumaRecBuffer = new Pel[ m_iLumaRecStride * m_iLumaRecStride ];
    }
  }

  Int shift = g_uiBitDepth + g_uiBitIncrement + 4;

  for( Int i = 32; i < 64; i++ )
  {
    m_uiaShift[i-32] = ( ( 1 << shift ) + i/2 ) / i;
  }
}

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

// Function for calculating DC value of the reference samples used in Intra prediction
Pel TComPrediction::predIntraGetPredValDC( Int* pSrc, Int iSrcStride, UInt iWidth, UInt iHeight, Bool bAbove, Bool bLeft )
{
  Int iInd, iSum = 0;
  Pel pDcVal;

  if (bAbove)
  {
    for (iInd = 0;iInd < iWidth;iInd++)
    {
      iSum += pSrc[iInd-iSrcStride];
    }
  }
  if (bLeft)
  {
    for (iInd = 0;iInd < iHeight;iInd++)
    {
      iSum += pSrc[iInd*iSrcStride-1];
    }
  }

  if (bAbove && bLeft)
  {
    pDcVal = (iSum + iWidth) / (iWidth + iHeight);
  }
  else if (bAbove)
  {
    pDcVal = (iSum + iWidth/2) / iWidth;
  }
  else if (bLeft)
  {
    pDcVal = (iSum + iHeight/2) / iHeight;
  }
  else
  {
    pDcVal = pSrc[-1]; // Default DC value already calculated and placed in the prediction array if no neighbors are available
  }
  
  return pDcVal;
}

// Function for deriving the angular Intra predictions

/** Function for deriving the simplified angular intra predictions.
 * \param pSrc pointer to reconstructed sample array
 * \param srcStride the stride of the reconstructed sample array
 * \param rpDst reference to pointer for the prediction sample array
 * \param dstStride the stride of the prediction sample array
 * \param width the width of the block
 * \param height the height of the block
 * \param dirMode the intra prediction mode index
 * \param blkAboveAvailable boolean indication if the block above is available
 * \param blkLeftAvailable boolean indication if the block to the left is available
 *
 * This function derives the prediction samples for the angular mode based on the prediction direction indicated by
 * the prediction mode index. The prediction direction is given by the displacement of the bottom row of the block and
 * the reference row above the block in the case of vertical prediction or displacement of the rightmost column
 * of the block and reference column left from the block in the case of the horizontal prediction. The displacement
 * is signalled at 1/32 pixel accuracy. When projection of the predicted pixel falls inbetween reference samples,
 * the predicted value for the pixel is linearly interpolated from the reference samples. All reference samples are taken
 * from the extended main reference.
 */
Void TComPrediction::xPredIntraAng( Int* pSrc, Int srcStride, Pel*& rpDst, Int dstStride, UInt width, UInt height, UInt dirMode, Bool blkAboveAvailable, Bool blkLeftAvailable, Bool bFilter )
{
  Int k,l;
  Int blkSize        = width;
  Pel* pDst          = rpDst;

  // Map the mode index to main prediction direction and angle
  assert( dirMode > 0 ); //no planar
  Bool modeDC        = dirMode < 2;
  Bool modeHor       = !modeDC && (dirMode < 18);
  Bool modeVer       = !modeDC && !modeHor;
  Int intraPredAngle = modeVer ? (Int)dirMode - VER_IDX : modeHor ? -((Int)dirMode - HOR_IDX) : 0;
  Int absAng         = abs(intraPredAngle);
  Int signAng        = intraPredAngle < 0 ? -1 : 1;

  // Set bitshifts and scale the angle parameter to block size
  Int angTable[9]    = {0,    2,    5,   9,  13,  17,  21,  26,  32};
  Int invAngTable[9] = {0, 4096, 1638, 910, 630, 482, 390, 315, 256}; // (256 * 32) / Angle
  Int invAngle       = invAngTable[absAng];
  absAng             = angTable[absAng];
  intraPredAngle     = signAng * absAng;

  // Do the DC prediction
  if (modeDC)
  {
    Pel dcval = predIntraGetPredValDC(pSrc, srcStride, width, height, blkAboveAvailable, blkLeftAvailable);

    for (k=0;k<blkSize;k++)
    {
      for (l=0;l<blkSize;l++)
      {
        pDst[k*dstStride+l] = dcval;
      }
    }
  }

  // Do angular predictions
  else
  {
    Pel* refMain;
    Pel* refSide;
    Pel  refAbove[2*MAX_CU_SIZE+1];
    Pel  refLeft[2*MAX_CU_SIZE+1];

    // Initialise the Main and Left reference array.
    if (intraPredAngle < 0)
    {
      for (k=0;k<blkSize+1;k++)
      {
        refAbove[k+blkSize-1] = pSrc[k-srcStride-1];
      }
      for (k=0;k<blkSize+1;k++)
      {
        refLeft[k+blkSize-1] = pSrc[(k-1)*srcStride-1];
      }
      refMain = (modeVer ? refAbove : refLeft) + (blkSize-1);
      refSide = (modeVer ? refLeft : refAbove) + (blkSize-1);

      // Extend the Main reference to the left.
      Int invAngleSum    = 128;       // rounding for (shift by 8)
      for (k=-1; k>blkSize*intraPredAngle>>5; k--)
      {
        invAngleSum += invAngle;
        refMain[k] = refSide[invAngleSum>>8];
      }
    }
    else
    {
      for (k=0;k<2*blkSize+1;k++)
      {
        refAbove[k] = pSrc[k-srcStride-1];
      }
      for (k=0;k<2*blkSize+1;k++)
      {
        refLeft[k] = pSrc[(k-1)*srcStride-1];
      }
      refMain = modeVer ? refAbove : refLeft;
      refSide = modeVer ? refLeft  : refAbove;
    }

    if (intraPredAngle == 0)
    {
      for (k=0;k<blkSize;k++)
      {
        for (l=0;l<blkSize;l++)
        {
          pDst[k*dstStride+l] = refMain[l+1];
        }
      }

      if ( bFilter )
      {
        for (k=0;k<blkSize;k++)
        {
          pDst[k*dstStride] = Clip ( pDst[k*dstStride] + (( refSide[k+1] - refSide[0] ) >> 1) );
        }
      }
    }
    else
    {
      Int deltaPos=0;
      Int deltaInt;
      Int deltaFract;
      Int refMainIndex;

      for (k=0;k<blkSize;k++)
      {
        deltaPos += intraPredAngle;
        deltaInt   = deltaPos >> 5;
        deltaFract = deltaPos & (32 - 1);

        if (deltaFract)
        {
          // Do linear filtering
          for (l=0;l<blkSize;l++)
          {
            refMainIndex        = l+deltaInt+1;
            pDst[k*dstStride+l] = (Pel) ( ((32-deltaFract)*refMain[refMainIndex]+deltaFract*refMain[refMainIndex+1]+16) >> 5 );
          }
        }
        else
        {
          // Just copy the integer samples
          for (l=0;l<blkSize;l++)
          {
            pDst[k*dstStride+l] = refMain[l+deltaInt+1];
          }
        }
      }
    }

    // Flip the block if this is the horizontal mode
    if (modeHor)
    {
      Pel  tmp;
      for (k=0;k<blkSize-1;k++)
      {
        for (l=k+1;l<blkSize;l++)
        {
          tmp                 = pDst[k*dstStride+l];
          pDst[k*dstStride+l] = pDst[l*dstStride+k];
          pDst[l*dstStride+k] = tmp;
        }
      }
    }
  }
}

Void TComPrediction::predIntraLumaAng(TComPattern* pcTComPattern, UInt uiDirMode, Pel* piPred, UInt uiStride, Int iWidth, Int iHeight,  TComDataCU* pcCU, Bool bAbove, Bool bLeft )
{
  Pel *pDst = piPred;
  Int *ptrSrc;

  assert( g_aucConvertToBit[ iWidth ] >= 0 ); //   4x  4
  assert( g_aucConvertToBit[ iWidth ] <= 5 ); // 128x128
  assert( iWidth == iHeight  );

  ptrSrc = pcTComPattern->getPredictorPtr( uiDirMode, g_aucConvertToBit[ iWidth ] + 2, m_piYuvExt );

  // get starting pixel in block
  Int sw = 2 * iWidth + 1;

  // Create the prediction
  if ( uiDirMode == PLANAR_IDX )
  {
    xPredIntraPlanar( ptrSrc+sw+1, sw, pDst, uiStride, iWidth, iHeight );
  }
  else
  {
    xPredIntraAng( ptrSrc+sw+1, sw, pDst, uiStride, iWidth, iHeight, uiDirMode, bAbove, bLeft, true );

    if( (uiDirMode == DC_IDX ) && bAbove && bLeft )
    {
      xDCPredFiltering( ptrSrc+sw+1, sw, pDst, uiStride, iWidth, iHeight);
    }
  }
}

// Angular chroma
Void TComPrediction::predIntraChromaAng( TComPattern* pcTComPattern, Int* piSrc, UInt uiDirMode, Pel* piPred, UInt uiStride, Int iWidth, Int iHeight, TComDataCU* pcCU, Bool bAbove, Bool bLeft )
{
  Pel *pDst = piPred;
  Int *ptrSrc = piSrc;

  // get starting pixel in block
  Int sw = 2 * iWidth + 1;

  if ( uiDirMode == PLANAR_IDX )
  {
    xPredIntraPlanar( ptrSrc+sw+1, sw, pDst, uiStride, iWidth, iHeight );
  }
  else
  {
    // Create the prediction
    xPredIntraAng( ptrSrc+sw+1, sw, pDst, uiStride, iWidth, iHeight, uiDirMode, bAbove, bLeft, false );
  }
}

/** Function for checking identical motion.
 * \param TComDataCU* pcCU
 * \param UInt PartAddr
 */
Bool TComPrediction::xCheckIdenticalMotion ( TComDataCU* pcCU, UInt PartAddr )
{
  if( pcCU->getSlice()->isInterB() && !pcCU->getSlice()->getPPS()->getWPBiPred() )
  {
    if( pcCU->getCUMvField(REF_PIC_LIST_0)->getRefIdx(PartAddr) >= 0 && pcCU->getCUMvField(REF_PIC_LIST_1)->getRefIdx(PartAddr) >= 0)
    {
      Int RefPOCL0 = pcCU->getSlice()->getRefPic(REF_PIC_LIST_0, pcCU->getCUMvField(REF_PIC_LIST_0)->getRefIdx(PartAddr))->getPOC();
      Int RefPOCL1 = pcCU->getSlice()->getRefPic(REF_PIC_LIST_1, pcCU->getCUMvField(REF_PIC_LIST_1)->getRefIdx(PartAddr))->getPOC();
      if(RefPOCL0 == RefPOCL1 && pcCU->getCUMvField(REF_PIC_LIST_0)->getMv(PartAddr) == pcCU->getCUMvField(REF_PIC_LIST_1)->getMv(PartAddr))
      {
        return true;
      }
    }
  }
  return false;
}

#if INTRA_BL
Void TComPrediction::getBaseBlk( TComDataCU* pcCU, TComYuv* pcYuvPred, Int iPartAddr, Int iWidth, Int iHeight )
{
  pcCU->getBaseLumaBlk( iWidth, iHeight, iPartAddr, pcYuvPred->getLumaAddr( iPartAddr ), pcYuvPred->getStride() );
  pcCU->getBaseChromaBlk( iWidth >> 1, iHeight >> 1, iPartAddr, pcYuvPred->getCbAddr( iPartAddr ), pcYuvPred->getCStride(), 0 );
  pcCU->getBaseChromaBlk( iWidth >> 1, iHeight >> 1, iPartAddr, pcYuvPred->getCrAddr( iPartAddr ), pcYuvPred->getCStride(), 1 );
}
#endif

Void TComPrediction::motionCompensation ( TComDataCU* pcCU, TComYuv* pcYuvPred, RefPicList eRefPicList, Int iPartIdx )
{
  Int         iWidth;
  Int         iHeight;
  UInt        uiPartAddr;

  if ( iPartIdx >= 0 )
  {
    pcCU->getPartIndexAndSize( iPartIdx, uiPartAddr, iWidth, iHeight );
    if ( eRefPicList != REF_PIC_LIST_X )
    {
      if( pcCU->getSlice()->getPPS()->getUseWP())
      {
        xPredInterUni (pcCU, uiPartAddr, iWidth, iHeight, eRefPicList, pcYuvPred, iPartIdx, true );
      }
      else
      {
        xPredInterUni (pcCU, uiPartAddr, iWidth, iHeight, eRefPicList, pcYuvPred, iPartIdx );
      }
      if ( pcCU->getSlice()->getPPS()->getUseWP() )
      {
        xWeightedPredictionUni( pcCU, pcYuvPred, uiPartAddr, iWidth, iHeight, eRefPicList, pcYuvPred, iPartIdx );
      }
    }
    else
    {
      if ( xCheckIdenticalMotion( pcCU, uiPartAddr ) )
      {
        xPredInterUni (pcCU, uiPartAddr, iWidth, iHeight, REF_PIC_LIST_0, pcYuvPred, iPartIdx );
      }
      else
      {
        xPredInterBi  (pcCU, uiPartAddr, iWidth, iHeight, pcYuvPred, iPartIdx );
      }
    }
    return;
  }

  for ( iPartIdx = 0; iPartIdx < pcCU->getNumPartInter(); iPartIdx++ )
  {
    pcCU->getPartIndexAndSize( iPartIdx, uiPartAddr, iWidth, iHeight );

    if ( eRefPicList != REF_PIC_LIST_X )
    {
      if( pcCU->getSlice()->getPPS()->getUseWP())
      {
        xPredInterUni (pcCU, uiPartAddr, iWidth, iHeight, eRefPicList, pcYuvPred, iPartIdx, true );
      }
      else
      {
        xPredInterUni (pcCU, uiPartAddr, iWidth, iHeight, eRefPicList, pcYuvPred, iPartIdx );
      }
      if ( pcCU->getSlice()->getPPS()->getUseWP() )
      {
        xWeightedPredictionUni( pcCU, pcYuvPred, uiPartAddr, iWidth, iHeight, eRefPicList, pcYuvPred, iPartIdx );
      }
    }
    else
    {
      if ( xCheckIdenticalMotion( pcCU, uiPartAddr ) )
      {
        xPredInterUni (pcCU, uiPartAddr, iWidth, iHeight, REF_PIC_LIST_0, pcYuvPred, iPartIdx );
      }
      else
      {
        xPredInterBi  (pcCU, uiPartAddr, iWidth, iHeight, pcYuvPred, iPartIdx );
      }
    }
  }
  return;
}

Void TComPrediction::xPredInterUni ( TComDataCU* pcCU, UInt uiPartAddr, Int iWidth, Int iHeight, RefPicList eRefPicList, TComYuv*& rpcYuvPred, Int iPartIdx, Bool bi )
{
  Int         iRefIdx     = pcCU->getCUMvField( eRefPicList )->getRefIdx( uiPartAddr );           assert (iRefIdx >= 0);
  TComMv      cMv         = pcCU->getCUMvField( eRefPicList )->getMv( uiPartAddr );
  pcCU->clipMv(cMv);
  xPredInterLumaBlk  ( pcCU, pcCU->getSlice()->getRefPic( eRefPicList, iRefIdx )->getPicYuvRec(), uiPartAddr, &cMv, iWidth, iHeight, rpcYuvPred, bi );
  xPredInterChromaBlk( pcCU, pcCU->getSlice()->getRefPic( eRefPicList, iRefIdx )->getPicYuvRec(), uiPartAddr, &cMv, iWidth, iHeight, rpcYuvPred, bi );
}

Void TComPrediction::xPredInterBi ( TComDataCU* pcCU, UInt uiPartAddr, Int iWidth, Int iHeight, TComYuv*& rpcYuvPred, Int iPartIdx )
{
  TComYuv* pcMbYuv;
  Int      iRefIdx[2] = {-1, -1};

  for ( Int iRefList = 0; iRefList < 2; iRefList++ )
  {
    RefPicList eRefPicList = (iRefList ? REF_PIC_LIST_1 : REF_PIC_LIST_0);
    iRefIdx[iRefList] = pcCU->getCUMvField( eRefPicList )->getRefIdx( uiPartAddr );

    if ( iRefIdx[iRefList] < 0 )
    {
      continue;
    }

    assert( iRefIdx[iRefList] < pcCU->getSlice()->getNumRefIdx(eRefPicList) );

    pcMbYuv = &m_acYuvPred[iRefList];
    if( pcCU->getCUMvField( REF_PIC_LIST_0 )->getRefIdx( uiPartAddr ) >= 0 && pcCU->getCUMvField( REF_PIC_LIST_1 )->getRefIdx( uiPartAddr ) >= 0 )
    {
      xPredInterUni ( pcCU, uiPartAddr, iWidth, iHeight, eRefPicList, pcMbYuv, iPartIdx, true );
    }
    else
    {
      if ( ( pcCU->getSlice()->getPPS()->getUseWP()       && pcCU->getSlice()->getSliceType() == P_SLICE ) || 
           ( pcCU->getSlice()->getPPS()->getWPBiPred() && pcCU->getSlice()->getSliceType() == B_SLICE ) )
      {
        xPredInterUni ( pcCU, uiPartAddr, iWidth, iHeight, eRefPicList, pcMbYuv, iPartIdx, true );
      }
      else
      {
        xPredInterUni ( pcCU, uiPartAddr, iWidth, iHeight, eRefPicList, pcMbYuv, iPartIdx );
      }
    }
  }

  if ( pcCU->getSlice()->getPPS()->getWPBiPred() && pcCU->getSlice()->getSliceType() == B_SLICE  )
  {
    xWeightedPredictionBi( pcCU, &m_acYuvPred[0], &m_acYuvPred[1], iRefIdx[0], iRefIdx[1], uiPartAddr, iWidth, iHeight, rpcYuvPred );
  }  
  else if ( pcCU->getSlice()->getPPS()->getUseWP() && pcCU->getSlice()->getSliceType() == P_SLICE )
  {
    xWeightedPredictionUni( pcCU, &m_acYuvPred[0], uiPartAddr, iWidth, iHeight, REF_PIC_LIST_0, rpcYuvPred, iPartIdx ); 
  }
  else
  {
    xWeightedAverage( pcCU, &m_acYuvPred[0], &m_acYuvPred[1], iRefIdx[0], iRefIdx[1], uiPartAddr, iWidth, iHeight, rpcYuvPred );
  }
}

/**
 * \brief Generate motion-compensated luma block
 *
 * \param cu       Pointer to current CU
 * \param refPic   Pointer to reference picture
 * \param partAddr Address of block within CU
 * \param mv       Motion vector
 * \param width    Width of block
 * \param height   Height of block
 * \param dstPic   Pointer to destination picture
 * \param bi       Flag indicating whether bipred is used
 */
Void TComPrediction::xPredInterLumaBlk( TComDataCU *cu, TComPicYuv *refPic, UInt partAddr, TComMv *mv, Int width, Int height, TComYuv *&dstPic, Bool bi )
{
  Int refStride = refPic->getStride();  
  Int refOffset = ( mv->getHor() >> 2 ) + ( mv->getVer() >> 2 ) * refStride;
  Pel *ref      = refPic->getLumaAddr( cu->getAddr(), cu->getZorderIdxInCU() + partAddr ) + refOffset;
  
  Int dstStride = dstPic->getStride();
  Pel *dst      = dstPic->getLumaAddr( partAddr );
  
  Int xFrac = mv->getHor() & 0x3;
  Int yFrac = mv->getVer() & 0x3;

  if ( yFrac == 0 )
  {
    m_if.filterHorLuma( ref, refStride, dst, dstStride, width, height, xFrac,       !bi );
  }
  else if ( xFrac == 0 )
  {
    m_if.filterVerLuma( ref, refStride, dst, dstStride, width, height, yFrac, true, !bi );
  }
  else
  {
    Int tmpStride = m_filteredBlockTmp[0].getStride();
    Short *tmp    = m_filteredBlockTmp[0].getLumaAddr();

    Int filterSize = NTAPS_LUMA;
    Int halfFilterSize = ( filterSize >> 1 );

    m_if.filterHorLuma(ref - (halfFilterSize-1)*refStride, refStride, tmp, tmpStride, width, height+filterSize-1, xFrac, false     );
    m_if.filterVerLuma(tmp + (halfFilterSize-1)*tmpStride, tmpStride, dst, dstStride, width, height,              yFrac, false, !bi);    
  }
}

/**
 * \brief Generate motion-compensated chroma block
 *
 * \param cu       Pointer to current CU
 * \param refPic   Pointer to reference picture
 * \param partAddr Address of block within CU
 * \param mv       Motion vector
 * \param width    Width of block
 * \param height   Height of block
 * \param dstPic   Pointer to destination picture
 * \param bi       Flag indicating whether bipred is used
 */
Void TComPrediction::xPredInterChromaBlk( TComDataCU *cu, TComPicYuv *refPic, UInt partAddr, TComMv *mv, Int width, Int height, TComYuv *&dstPic, Bool bi )
{
  Int     refStride  = refPic->getCStride();
  Int     dstStride  = dstPic->getCStride();
  
  Int     refOffset  = (mv->getHor() >> 3) + (mv->getVer() >> 3) * refStride;
  
  Pel*    refCb     = refPic->getCbAddr( cu->getAddr(), cu->getZorderIdxInCU() + partAddr ) + refOffset;
  Pel*    refCr     = refPic->getCrAddr( cu->getAddr(), cu->getZorderIdxInCU() + partAddr ) + refOffset;
  
  Pel* dstCb = dstPic->getCbAddr( partAddr );
  Pel* dstCr = dstPic->getCrAddr( partAddr );
  
  Int     xFrac  = mv->getHor() & 0x7;
  Int     yFrac  = mv->getVer() & 0x7;
  UInt    cxWidth  = width  >> 1;
  UInt    cxHeight = height >> 1;
  
  Int     extStride = m_filteredBlockTmp[0].getStride();
  Short*  extY      = m_filteredBlockTmp[0].getLumaAddr();
  
  Int filterSize = NTAPS_CHROMA;
  
  Int halfFilterSize = (filterSize>>1);
  
  if ( yFrac == 0 )
  {
    m_if.filterHorChroma(refCb, refStride, dstCb,  dstStride, cxWidth, cxHeight, xFrac, !bi);    
    m_if.filterHorChroma(refCr, refStride, dstCr,  dstStride, cxWidth, cxHeight, xFrac, !bi);    
  }
  else if ( xFrac == 0 )
  {
    m_if.filterVerChroma(refCb, refStride, dstCb, dstStride, cxWidth, cxHeight, yFrac, true, !bi);    
    m_if.filterVerChroma(refCr, refStride, dstCr, dstStride, cxWidth, cxHeight, yFrac, true, !bi);    
  }
  else
  {
    m_if.filterHorChroma(refCb - (halfFilterSize-1)*refStride, refStride, extY,  extStride, cxWidth, cxHeight+filterSize-1, xFrac, false);
    m_if.filterVerChroma(extY  + (halfFilterSize-1)*extStride, extStride, dstCb, dstStride, cxWidth, cxHeight  , yFrac, false, !bi);
    
    m_if.filterHorChroma(refCr - (halfFilterSize-1)*refStride, refStride, extY,  extStride, cxWidth, cxHeight+filterSize-1, xFrac, false);
    m_if.filterVerChroma(extY  + (halfFilterSize-1)*extStride, extStride, dstCr, dstStride, cxWidth, cxHeight  , yFrac, false, !bi);    
  }
}

Void TComPrediction::xWeightedAverage( TComDataCU* pcCU, TComYuv* pcYuvSrc0, TComYuv* pcYuvSrc1, Int iRefIdx0, Int iRefIdx1, UInt uiPartIdx, Int iWidth, Int iHeight, TComYuv*& rpcYuvDst )
{
  if( iRefIdx0 >= 0 && iRefIdx1 >= 0 )
  {
    rpcYuvDst->addAvg( pcYuvSrc0, pcYuvSrc1, uiPartIdx, iWidth, iHeight );
  }
  else if ( iRefIdx0 >= 0 && iRefIdx1 <  0 )
  {
    pcYuvSrc0->copyPartToPartYuv( rpcYuvDst, uiPartIdx, iWidth, iHeight );
  }
  else if ( iRefIdx0 <  0 && iRefIdx1 >= 0 )
  {
    pcYuvSrc1->copyPartToPartYuv( rpcYuvDst, uiPartIdx, iWidth, iHeight );
  }
}

// AMVP
Void TComPrediction::getMvPredAMVP( TComDataCU* pcCU, UInt uiPartIdx, UInt uiPartAddr, RefPicList eRefPicList, Int iRefIdx, TComMv& rcMvPred )
{
  AMVPInfo* pcAMVPInfo = pcCU->getCUMvField(eRefPicList)->getAMVPInfo();
#if !SPS_AMVP_CLEANUP
  if( pcCU->getAMVPMode(uiPartAddr) == AM_NONE || (pcAMVPInfo->iN <= 1 && pcCU->getAMVPMode(uiPartAddr) == AM_EXPL) )
#else
  if( pcAMVPInfo->iN <= 1 )
#endif
  {
    rcMvPred = pcAMVPInfo->m_acMvCand[0];

    pcCU->setMVPIdxSubParts( 0, eRefPicList, uiPartAddr, uiPartIdx, pcCU->getDepth(uiPartAddr));
    pcCU->setMVPNumSubParts( pcAMVPInfo->iN, eRefPicList, uiPartAddr, uiPartIdx, pcCU->getDepth(uiPartAddr));
    return;
  }

  assert(pcCU->getMVPIdx(eRefPicList,uiPartAddr) >= 0);
  rcMvPred = pcAMVPInfo->m_acMvCand[pcCU->getMVPIdx(eRefPicList,uiPartAddr)];
  return;
}

/** Function for deriving planar intra prediction.
 * \param pSrc pointer to reconstructed sample array
 * \param srcStride the stride of the reconstructed sample array
 * \param rpDst reference to pointer for the prediction sample array
 * \param dstStride the stride of the prediction sample array
 * \param width the width of the block
 * \param height the height of the block
 *
 * This function derives the prediction samples for planar mode (intra coding).
 */
Void TComPrediction::xPredIntraPlanar( Int* pSrc, Int srcStride, Pel* rpDst, Int dstStride, UInt width, UInt height )
{
  assert(width == height);

  Int k, l, bottomLeft, topRight;
  Int horPred;
  Int leftColumn[MAX_CU_SIZE], topRow[MAX_CU_SIZE], bottomRow[MAX_CU_SIZE], rightColumn[MAX_CU_SIZE];
  UInt blkSize = width;
  UInt offset2D = width;
  UInt shift1D = g_aucConvertToBit[ width ] + 2;
  UInt shift2D = shift1D + 1;

  // Get left and above reference column and row
  for(k=0;k<blkSize+1;k++)
  {
    topRow[k] = pSrc[k-srcStride];
    leftColumn[k] = pSrc[k*srcStride-1];
  }

  // Prepare intermediate variables used in interpolation
  bottomLeft = leftColumn[blkSize];
  topRight   = topRow[blkSize];
  for (k=0;k<blkSize;k++)
  {
    bottomRow[k]   = bottomLeft - topRow[k];
    rightColumn[k] = topRight   - leftColumn[k];
    topRow[k]      <<= shift1D;
    leftColumn[k]  <<= shift1D;
  }

  // Generate prediction signal
  for (k=0;k<blkSize;k++)
  {
    horPred = leftColumn[k] + offset2D;
    for (l=0;l<blkSize;l++)
    {
      horPred += rightColumn[k];
      topRow[l] += bottomRow[l];
      rpDst[k*dstStride+l] = ( (horPred + topRow[l]) >> shift2D );
    }
  }
}

#if !REMOVE_LMCHROMA
/** Function for deriving chroma LM intra prediction.
 * \param pcPattern pointer to neighbouring pixel access pattern
 * \param piSrc pointer to reconstructed chroma sample array
 * \param pPred pointer for the prediction sample array
 * \param uiPredStride the stride of the prediction sample array
 * \param uiCWidth the width of the chroma block
 * \param uiCHeight the height of the chroma block
 * \param uiChromaId boolean indication of chroma component
 *
 * This function derives the prediction samples for chroma LM mode (chroma intra coding)
 */
Void TComPrediction::predLMIntraChroma( TComPattern* pcPattern, Int* piSrc, Pel* pPred, UInt uiPredStride, UInt uiCWidth, UInt uiCHeight, UInt uiChromaId )
{
  UInt uiWidth  = 2 * uiCWidth;

  xGetLLSPrediction( pcPattern, piSrc+uiWidth+2, uiWidth+1, pPred, uiPredStride, uiCWidth, uiCHeight, 1 );  
}

/** Function for deriving downsampled luma sample of current chroma block and its above, left causal pixel
 * \param pcPattern pointer to neighbouring pixel access pattern
 * \param uiCWidth the width of the chroma block
 * \param uiCHeight the height of the chroma block
 *
 * This function derives downsampled luma sample of current chroma block and its above, left causal pixel
 */
Void TComPrediction::getLumaRecPixels( TComPattern* pcPattern, UInt uiCWidth, UInt uiCHeight )
{
  UInt uiWidth  = 2 * uiCWidth;
  UInt uiHeight = 2 * uiCHeight;  

  Pel* pRecSrc = pcPattern->getROIY();
  Pel* pDst0 = m_pLumaRecBuffer + m_iLumaRecStride + 1;

  Int iRecSrcStride = pcPattern->getPatternLStride();
  Int iRecSrcStride2 = iRecSrcStride << 1;
  Int iDstStride = m_iLumaRecStride;
  Int iSrcStride = ( max( uiWidth, uiHeight ) << 1 ) + 1;

  Int* ptrSrc = pcPattern->getAdiOrgBuf( uiWidth, uiHeight, m_piYuvExt );

  // initial pointers
  Pel* pDst = pDst0 - 1 - iDstStride;  
  Int* piSrc = ptrSrc;

  // top left corner downsampled from ADI buffer
  // don't need this point

  // top row downsampled from ADI buffer
  pDst++;     
  piSrc ++;
  for (Int i = 0; i < uiCWidth; i++)
  {
    pDst[i] = ((piSrc[2*i] * 2 ) + piSrc[2*i - 1] + piSrc[2*i + 1] + 2) >> 2;
  }

  // left column downsampled from ADI buffer
  pDst = pDst0 - 1; 
  piSrc = ptrSrc + iSrcStride;
  for (Int j = 0; j < uiCHeight; j++)
  {
    pDst[0] = ( piSrc[0] + piSrc[iSrcStride] ) >> 1;
    piSrc += iSrcStride << 1; 
    pDst += iDstStride;    
  }

  // inner part from reconstructed picture buffer
  for( Int j = 0; j < uiCHeight; j++ )
  {
    for (Int i = 0; i < uiCWidth; i++)
    {
      pDst0[i] = (pRecSrc[2*i] + pRecSrc[2*i + iRecSrcStride]) >> 1;
    }

    pDst0 += iDstStride;
    pRecSrc += iRecSrcStride2;
  }
}

/** Function for deriving the positon of first non-zero binary bit of a value
 * \param x input value
 *
 * This function derives the positon of first non-zero binary bit of a value
 */
Int GetFloorLog2( UInt x )
{
  int bits = -1;
  while( x > 0 )
  {
    bits ++;
    x >>= 1;
  }
  return bits;
}

/** Function for deriving LM intra prediction.
 * \param pcPattern pointer to neighbouring pixel access pattern
 * \param pSrc0 pointer to reconstructed chroma sample array
 * \param iSrcStride the stride of reconstructed chroma sample array
 * \param pDst0 reference to pointer for the prediction sample array
 * \param iDstStride the stride of the prediction sample array
 * \param uiWidth the width of the chroma block
 * \param uiHeight the height of the chroma block
 * \param uiExt0 line number of neiggboirng pixels for calculating LM model parameter, default value is 1
 *
 * This function derives the prediction samples for chroma LM mode (chroma intra coding)
 */
Void TComPrediction::xGetLLSPrediction( TComPattern* pcPattern, Int* pSrc0, Int iSrcStride, Pel* pDst0, Int iDstStride, UInt uiWidth, UInt uiHeight, UInt uiExt0 )
{

  Pel  *pDst, *pLuma;
  Int  *pSrc;

  Int  iLumaStride = m_iLumaRecStride;
  Pel* pLuma0 = m_pLumaRecBuffer + uiExt0 * iLumaStride + uiExt0;

  Int i, j, iCountShift = 0;
  UInt uiInternalBitDepth = g_uiBitDepth + g_uiBitIncrement;

  UInt uiExt = uiExt0;

  // LLS parameters estimation -->

  Int x = 0, y = 0, xx = 0, xy = 0;

  pSrc  = pSrc0  - iSrcStride;
  pLuma = pLuma0 - iLumaStride;

  for( j = 0; j < uiWidth; j++ )
  {
    x += pLuma[j];
    y += pSrc[j];
    xx += pLuma[j] * pLuma[j];
    xy += pLuma[j] * pSrc[j];
  }

  pSrc  = pSrc0 - uiExt;
  pLuma = pLuma0 - uiExt;

  for( i = 0; i < uiHeight; i++ )
  {
    x += pLuma[0];
    y += pSrc[0];
    xx += pLuma[0] * pLuma[0];
    xy += pLuma[0] * pSrc[0];

    pSrc  += iSrcStride;
    pLuma += iLumaStride;
  }
  iCountShift = g_aucConvertToBit[ uiWidth ] + 3;

  Int iTempShift = uiInternalBitDepth + iCountShift - 15;

  if(iTempShift > 0)
  {
    x  = ( x +  ( 1 << ( iTempShift - 1 ) ) ) >> iTempShift;
    y  = ( y +  ( 1 << ( iTempShift - 1 ) ) ) >> iTempShift;
    xx = ( xx + ( 1 << ( iTempShift - 1 ) ) ) >> iTempShift;
    xy = ( xy + ( 1 << ( iTempShift - 1 ) ) ) >> iTempShift;
    iCountShift -= iTempShift;
  }

  Int avgLuma =  x   >> iCountShift;
  Int avgSrc =  y  >> iCountShift;
  Int RErrLuma = x & ( ( 1 << iCountShift ) - 1 );
  Int RErrSrc =  y & ( ( 1 << iCountShift ) - 1 );

  Int a, b, iShift = 13;

  Int iB = 7;
  iShift -= iB;

  if( iCountShift == 0 )
  {
    a = 0;
    b = 1 << (uiInternalBitDepth - 1);
    iShift = 0;
  }
  else
  {
    Int a1 = xy - ( avgLuma*avgSrc << iCountShift ) - avgLuma*RErrSrc - avgSrc*RErrLuma;
    Int a2 = xx - ( avgLuma*avgLuma << iCountShift ) - 2*avgLuma*RErrLuma;

    const Int iShiftA1 = uiInternalBitDepth - 2;
    const Int iShiftA2 = 5;
    const Int iAccuracyShift = uiInternalBitDepth + 4;

    Int iScaleShiftA2 = 0;
    Int iScaleShiftA1 = 0;
    Int a1s = a1;
    Int a2s = a2;

    iScaleShiftA1 = a1 == 0 ? 0 : GetFloorLog2( abs( a1 ) ) - iShiftA1;
    iScaleShiftA2 = a2 == 0 ? 0 : GetFloorLog2( abs( a2 ) ) - iShiftA2;

    if( iScaleShiftA1 < 0 )
    {
      iScaleShiftA1 = 0;
    }
    
    if( iScaleShiftA2 < 0 )
    {
      iScaleShiftA2 = 0;
    }

    Int iScaleShiftA = iScaleShiftA2 + iAccuracyShift - iShift - iScaleShiftA1;

    a2s = a2 >> iScaleShiftA2;

    a1s = a1 >> iScaleShiftA1;

    if (a2s >= 32)
    {
      UInt a2t = m_uiaShift[ a2s - 32 ] ;
      a2t = Clip( a2t );
      a = a1s * a2t;
    }
    else
    {
      a = 0;
    }
    
    if( iScaleShiftA < 0 )
    {
      a = a << -iScaleShiftA;
    }
    else
    {
      a = a >> iScaleShiftA;
    }
    a = Clip3(-( 1 << (15-iB) ), ( 1 << (15-iB )) - 1, a);
    a = a << iB;
   
    Short n = 0;
    if (a != 0)
    {
      n = GetFloorLog2(abs( a ) + ( (a < 0 ? -1 : 1) - 1)/2 ) - 5;
    }
    
    iShift =(iShift+iB)-n;
    a = a>>n;

    b =  avgSrc - ( (  a * avgLuma ) >> iShift );
  }   

  // <-- end of LLS parameters estimation

  // get prediction -->
  uiExt = uiExt0;
  pLuma = pLuma0;
  pDst = pDst0;

  for( i = 0; i < uiHeight; i++ )
  {
    for( j = 0; j < uiWidth; j++ )
    {
      pDst[j] = Clip( ( ( a * pLuma[j] ) >> iShift ) + b );
    }
    
    pDst  += iDstStride;
    pLuma += iLumaStride;
  }
  // <-- end of get prediction

}
#endif

/** Function for filtering intra DC predictor.
 * \param pSrc pointer to reconstructed sample array
 * \param iSrcStride the stride of the reconstructed sample array
 * \param rpDst reference to pointer for the prediction sample array
 * \param iDstStride the stride of the prediction sample array
 * \param iWidth the width of the block
 * \param iHeight the height of the block
 *
 * This function performs filtering left and top edges of the prediction samples for DC mode (intra coding).
 */
Void TComPrediction::xDCPredFiltering( Int* pSrc, Int iSrcStride, Pel*& rpDst, Int iDstStride, Int iWidth, Int iHeight )
{
  Pel* pDst = rpDst;
  Int x, y, iDstStride2, iSrcStride2;

  // boundary pixels processing
  pDst[0] = (Pel)((pSrc[-iSrcStride] + pSrc[-1] + 2 * pDst[0] + 2) >> 2);

  for ( x = 1; x < iWidth; x++ )
  {
    pDst[x] = (Pel)((pSrc[x - iSrcStride] +  3 * pDst[x] + 2) >> 2);
  }

  for ( y = 1, iDstStride2 = iDstStride, iSrcStride2 = iSrcStride-1; y < iHeight; y++, iDstStride2+=iDstStride, iSrcStride2+=iSrcStride )
  {
    pDst[iDstStride2] = (Pel)((pSrc[iSrcStride2] + 3 * pDst[iDstStride2] + 2) >> 2);
  }

  return;
}

#if SVC_UPSAMPLING
Void TComPrediction::upsampleBasePic( TComPicYuv* pcUsPic, TComPicYuv* pcBasePic, TComPicYuv* pcTempPic)
{
  m_cUsf.upsampleBasePic( pcUsPic, pcBasePic, pcTempPic);
}
#endif
//! \}