OpenCV | YUV420_NV21 转 BGR

void BGR2NV21( unsigned char *imgSrc, unsigned char *imgDst, int width, int height )
{
	int w, h;
	int shift = 14, offset1 = 8192, offset2 = 2105344;
	int C0 = 1868, C1 = 9617, C2 = 4899, C3 = 11682, C4 = 9241;

	int r1,r2,g1,g2,b1,b2;
	
	unsigned char * pRGB1 = imgSrc;
	unsigned char * pRGB2 = imgSrc+width*3;

	unsigned char * pDY1 = imgDst;
	unsigned char * pDY2 = imgDst+width;
	unsigned char * pDUV = imgDst+width*height;

	for ( h = 0; h < height; h += 2 )
	{
		for ( w = 0; w < width; w += 2 )
		{
			b1 = *pRGB1++;
			g1 = *pRGB1++;
			r1 = *pRGB1++;
			*pDY1  = (b1 * C0 + g1 * C1 + r1 * C2 + offset1) >> shift;
			*pDUV++ = ((r1 - *pDY1) * C3 + offset2) >> shift;
			*pDUV++ = ((b1 - *pDY1) * C4 + offset2) >> shift;
			pDY1++;

			b1 = *pRGB1+&

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