修改yv12像素值

YV12内存布局



 1 unsigned char *pY = (unsigned char *)pBuf;

 2 unsigned char *pV = pY + nWidth * nHeight;

 3 unsigned char *pU = pV + (nWidth>>1)*(nHeight>>1);

 4 

 5 //加上出入口数字指纹,以便确认识别出来的是哪个口 

 6 if(nPort==0)

 7 {

 8 pY[0]=0;

 9 pV[0]=0;

10 pU[0]=0;

11 }

12 else

13 {

14 pY[0]=255;

15 pV[0]=255;

16 pU[0]=255;

17 }