TComPicYuv::create

最新推荐文章于 2020-10-18 11:36:41 发布

原创最新推荐文章于 2020-10-18 11:36:41 发布 · 1.3k 阅读

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本文讨论了VoidTComPicYuv类在初始化过程中如何根据给定的图像宽度、高度和最大块大小来创建缓冲区，并设置必要的偏移量以支持运动补偿边界处理。重点在于理解图像和视频编码中块布局的实现细节。

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Void TComPicYuv::create( Int iPicWidth, Int iPicHeight, UInt uiMaxCUWidth, UInt uiMaxCUHeight, UInt uiMaxCUDepth )
{
  m_iPicWidth       = iPicWidth;
  m_iPicHeight      = iPicHeight;
  
  // --> After config finished!
  m_iCuWidth        = uiMaxCUWidth;
  m_iCuHeight       = uiMaxCUHeight;


  Int numCuInWidth  = m_iPicWidth  / m_iCuWidth  + (m_iPicWidth  % m_iCuWidth  != 0);
  Int numCuInHeight = m_iPicHeight / m_iCuHeight + (m_iPicHeight % m_iCuHeight != 0);
  
  m_iLumaMarginX    = g_uiMaxCUWidth  + 16; // for 16-byte alignment
  m_iLumaMarginY    = g_uiMaxCUHeight + 16;  // margin for 8-tap filter and infinite padding
  
  m_iChromaMarginX  = m_iLumaMarginX>>1;
  m_iChromaMarginY  = m_iLumaMarginY>>1;
  
  m_apiPicBufY      = (Pel*)xMalloc( Pel, ( m_iPicWidth       + (m_iLumaMarginX  <<1)) * ( m_iPicHeight       + (m_iLumaMarginY  <<1)));
  m_apiPicBufU      = (Pel*)xMalloc( Pel, ((m_iPicWidth >> 1) + (m_iChromaMarginX<<1)) * ((m_iPicHeight >> 1) + (m_iChromaMarginY<<1)));
  m_apiPicBufV      = (Pel*)xMalloc( Pel, ((m_iPicWidth >> 1) + (m_iChromaMarginX<<1)) * ((m_iPicHeight >> 1) + (m_iChromaMarginY<<1)));
  
  m_piPicOrgY       = m_apiPicBufY + m_iLumaMarginY   * getStride()  + m_iLumaMarginX;
  m_piPicOrgU       = m_apiPicBufU + m_iChromaMarginY * getCStride() + m_iChromaMarginX;
  m_piPicOrgV       = m_apiPicBufV + m_iChromaMarginY * getCStride() + m_iChromaMarginX;
  
  m_bIsBorderExtended = false;
  
  m_cuOffsetY = new Int[numCuInWidth * numCuInHeight];
  m_cuOffsetC = new Int[numCuInWidth * numCuInHeight];
  for (Int cuRow = 0; cuRow < numCuInHeight; cuRow++)
  {
    for (Int cuCol = 0; cuCol < numCuInWidth; cuCol++)
    {
      m_cuOffsetY[cuRow * numCuInWidth + cuCol] = getStride() * cuRow * m_iCuHeight + cuCol * m_iCuWidth;
      m_cuOffsetC[cuRow * numCuInWidth + cuCol] = getCStride() * cuRow * (m_iCuHeight / 2) + cuCol * (m_iCuWidth / 2);
    }
  }
  
  m_buOffsetY = new Int[(size_t)1 << (2 * uiMaxCUDepth)];
  m_buOffsetC = new Int[(size_t)1 << (2 * uiMaxCUDepth)];
  for (Int buRow = 0; buRow < (1 << uiMaxCUDepth); buRow++)
  {
    for (Int buCol = 0; buCol < (1 << uiMaxCUDepth); buCol++)
    {
      m_buOffsetY[(buRow << uiMaxCUDepth) + buCol] = getStride() * buRow * (uiMaxCUHeight >> uiMaxCUDepth) + buCol * (uiMaxCUWidth  >> uiMaxCUDepth);
      m_buOffsetC[(buRow << uiMaxCUDepth) + buCol] = getCStride() * buRow * (uiMaxCUHeight / 2 >> uiMaxCUDepth) + buCol * (uiMaxCUWidth / 2 >> uiMaxCUDepth);
    }
  }
  return;
}

开辟的空间比原来的大，主要是运动补偿边界的时候，特殊情况的处理