yuy2 转换为rgb 的bmp图像怎么转换

Question

大家好：
    最近我在写一个用摄像头采集图片的程序，我用的vfw的库，我用的摄像头是无驱动的，但是采集出来的图片不是我想要的格式，后来在网上一查是yuy2格式的，我想怎样可以把它转换为rgb格式的图片，我在网上找了一些资料，但是没有转换成功，我把代码贴出来，大家帮我看看是什么问题，我觉的是我的参数传的不对

void CFrameGrabber::update_buffer_size()
{
 vfs=capGetVideoFormatSize(GetSafeHwnd());
   if(!vfs)
   {
    if(imageData)
     {HGLOBAL hg = GlobalHandle(imageData);
     GlobalUnlock(hg);
     GlobalFree(hg);}
     vfs = 0;
     imageData = NULL;
    return;  
   }
 
  DWORD lastBufferSize=0;
  if(imageData)
   lastBufferSize = vfs +
   IMAGEWIDTH(imageData)*IMAGEHEIGHT(imageData)*IMAGEBITS(imageData)/8;
  
  DWORD newBufferSize;
  
 
  BITMAPINFO *lpBmpInfo =(BITMAPINFO *)( new char[vfs]);
  
  ((LPBITMAPINFOHEADER)lpBmpInfo)->biSize= sizeof BITMAPINFOHEADER;
  
  if(!capGetVideoFormat(GetSafeHwnd(), lpBmpInfo, (WORD)vfs))
  {
   delete lpBmpInfo;
   
   if(imageData)
    {HGLOBAL hg = GlobalHandle(imageData);
    GlobalUnlock(hg);
    GlobalFree(hg);}
    vfs = 0;
    imageData = NULL;
   return;  
  }
 
  newBufferSize = vfs + IMAGEWIDTH(lpBmpInfo)*IMAGEHEIGHT(lpBmpInfo)*IMAGEBITS(lpBmpInfo)/8;
  
  SetWindowPos(NULL,0,0,IMAGEWIDTH(lpBmpInfo),IMAGEHEIGHT(lpBmpInfo),
     SWP_NOMOVE|SWP_NOZORDER);
 
  if(newBufferSize > lastBufferSize)
  {
   if(imageData)//reallocate
   { HGLOBAL hg = GlobalHandle(imageData);
    GlobalUnlock(hg);
    GlobalFree(hg);}
 
   imageData = GlobalLock(GlobalAlloc(GMEM_MOVEABLE, newBufferSize+256/*add 256 bytes, just in case...*/));
  }
 
  //memcpy(imageData, lpBmpInfo, vfs);
  //memcpy(lpbuffer, lpBmpInfo, vfs);
  YUY2_RGB((BYTE*)imageData,(BYTE*)lpBmpInfo,vfs);  
  delete lpBmpInfo;  
}

void CFrameGrabber::YUY2_RGB(BYTE *YUY2buff, BYTE *RGBbuff, DWORD dwSize)
{
//
//C = Y - 16
//D = U - 128
//E = V - 128
//R = clip(( 298 * C           + 409 * E + 128) >> 8)
//G = clip(( 298 * C - 100 * D - 208 * E + 128) >> 8)
//B = clip(( 298 * C + 516 * D           + 128) >> 8)
 BYTE *orgRGBbuff = RGBbuff;
 for(DWORD count=0;count<dwSize;count+=4)
 {
  //Y0 U0 Y1 V0
  BYTE Y0 = *YUY2buff;
  BYTE U = *(++YUY2buff);
  BYTE Y1 = *(++YUY2buff);
  BYTE V = *(++YUY2buff);
  ++YUY2buff;

  LONG Y,C,D,E;
  BYTE R,G,B;
 
  Y = Y0;
  C = Y-16;
  D = U-128;
  E = V-128;
  R = clip255(( 298 * C           + 409 * E + 128) >> 8);
  G = clip255(( 298 * C - 100 * D - 208 * E + 128) >> 8);
  B = clip255(( 298 * C + 516 * D           + 128) >> 8);

  *(RGBbuff) =   B;          
  *(++RGBbuff) = G;  
  *(++RGBbuff) = R;        

  Y = Y1;
  C = Y-16;
  D = U-128;
  E = V-128;
  R = clip255(( 298 * C           + 409 * E + 128) >> 8);
  G = clip255(( 298 * C - 100 * D - 208 * E + 128) >> 8);
  B = clip255(( 298 * C + 516 * D           + 128) >> 8);
  *(++RGBbuff) =   B;          
  *(++RGBbuff) = G;  
  *(++RGBbuff) = R;        
  ++RGBbuff;
 
 }
}


BYTE CFrameGrabber::clip255(LONG v)
{
  if(v<0) v=0;
  else if(v>255) v=255;
  return (BYTE)v;
}

 

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黄春雨