yuv422转换为yuv420实现

//pYUV为422，yuv为420
int YUV422To420(unsigned char *pYUV, unsigned char*yuv, int lWidth, int lHeight)

{        

int i,j;

unsigned char*pY = yuv;

unsigned char *pU = yuv + lWidth*lHeight;

unsigned char *pV = pU + (lWidth*lHeight)/4;

 

unsigned char *pYUVTemp = pYUV;

unsigned char *pYUVTempNext = pYUV+lWidth*2;

         

 for(i=0; i

 {

    for(j=0; j

     {

       pY[j] = *pYUVTemp++;

       pY[j+lWidth] = *pYUVTempNext++;

                         

       pU[j/2] =(*(pYUVTemp) + *(pYUVTempNext))/2;

       pYUVTemp++;

       pYUVTempNext++;

                         

       pY[j+1] = *pYUVTemp++;

       pY[j+1+lWidth] = *pYUVTempNext++;

                         

       pV[j/2] =(*(pYUVTemp) + *(pYUVTempNext))/2;

       pYUVTemp++;

       pYUVTempNext++;

     }

       pYUVTemp+=lWidth*2;

       pYUVTempNext+=lWidth*2;

       pY+=lWidth*2;

       pU+=lWidth/2;

       pV+=lWidth/2;

   }

         

       return 1;

}

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