yuv420 yv12 与RGB转换算法

bool YV12_to_RGB24(unsigned char* pYV12, unsigned char* pRGB24, int iWidth, int iHeight)
{
 if(!pYV12 || !pRGB24)
    return false;
	
 const long nYLen = long(iHeight * iWidth);
 const int nHfWidth = (iWidth>>1);
 
 if(nYLen < 1 || nHfWidth < 1) 
    return false;
	
 unsigned char* yData = pYV12;
 unsigned char* vData = &yData[nYLen];
 unsigned char* uData = &vData[nYLen>>2];
 if(!uData || !vData)
    return false;

 int rgb[3];
 int i, j, m, n, x, y;
 m = -iWidth;
 n = -nHfWidth;
 for(y = 0; y < iHeight; y++)
 {
    m += iWidth;
	
    if(!(y % 2))
		n += nHfWidth;
		
    for(x=0; x < iWidth; x++)
    {
		i = m + x;
		j = n + (x>>1);
		rgb[2] = int(yData[i] + 1.370705 * (vData[j] - 128)); // r分量值
		rgb[1] = int(yData[i] - 0.698001 * (uData[j] - 128)  - 0.703125 * (vData[j] - 128)); // g分量值
		rgb[0] = int(yData[i] + 1.732446 * (uData[j] - 128)); // b分量值
		j = nYLen - iWidth - m + x;
		i = (j<<1) + j;
		for(j=0; j<3; j++)
		{
			if(rgb[j]>=0 && rgb[j]<=255)
				pRGB24[i + j] = rgb[j];
			else
				pRGB24[i + j] = (rgb[j] < 0) ? 0 : 255;
		}
    }
 }
 
 return true;
}

以上是yv12到RGB24的转换算法，如果是yuv420到RGB24转换，秩序u,v反过来就可以了。

即：

 unsigned char* uData = &yData[nYLen];
 unsigned char* vData = &vData[nYLen>>2];