HEVC MarginX MarginY的理解

来源：互联网发布：尼古拉斯赵四知乎编辑：程序博客网时间：2024/06/06 01:15

如上图所示，以亮度信号为例，解释了内存中扩展图像和原始图像之间的存储关系，以及计算关系，图像存储一份，色度信号与之类似。

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;}

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