HEVC帧内DC预测函数predIntraGetPredValDC()

// 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)
  {
	//=====上面iWidth个pel的值
    for (iInd = 0;iInd < iWidth;iInd++)
    {
      iSum += pSrc[iInd-iSrcStride];
    }
  }
  if (bLeft)
  {
	//=====左边iHeight个pel的值
    for (iInd = 0;iInd < iHeight;iInd++)
    {
      iSum += pSrc[iInd*iSrcStride-1];
    }
  }

  if (bAbove && bLeft)
  {
	//=====(所有可用点pel的和+宽)/(所有可用点数)
    pDcVal = (iSum + iWidth) / (iWidth + iHeight);
  }
  else if (bAbove)
  {
	//=====(所有可用点pel的和+宽/2)/(所有可用点数)
    pDcVal = (iSum + iWidth/2) / iWidth;
  }
  else if (bLeft)
  {
	//=====(所有可用点pel的和+高/2)/(所有可用点数)
    pDcVal = (iSum + iHeight/2) / iHeight;
  }
  else
  {
	//=====缺省值
    pDcVal = pSrc[-1]; // Default DC value already calculated and placed in the prediction array if no neighbors are available
  }
  
  return pDcVal;
}
//=====Jyno  2013/09/09