yuv转rgb的函数

 #define MR(Y,U,V) (Y + (1.403)*(V-128))
 #define MG(Y,U,V) (Y - (0.344) * (U-128) - (0.714) * (V-128) )
 #define MB(Y,U,V) (Y + ((1.773) * (U-128)))

yuv转rgb的函数：

 void YUV420_C_RGB( char* pYUV, unsigned char* pRGB, int height, int width)
 {
     char* pY = pYUV;
     char* pU = pYUV+height*width;
     char* pV = pU+(height*width/4);


     unsigned char* pBGR = NULL;
     unsigned char R = 0;
     unsigned char G = 0;
     unsigned char B = 0;
     char Y = 0;
     char U = 0;
     char V = 0;
     double tmp = 0;
     for ( int i = 0; i < height; ++i )
     {
         for ( int j = 0; j < width; ++j )
         {
             pBGR = pRGB+ i*width*3+j*3;

             Y = *(pY+i*width+j);
             U = *pU;
             V = *pV;

             //B
             tmp = MB(Y, U, V);
             //B = (tmp > 255) ? 255 : (char)tmp;
             //B = (B<0) ? 0 : B;
             B = (unsigned char)tmp;
             //G
             tmp = MG(Y, U, V);
             //G = (tmp > 255) ? 255 : (char)tmp;
            // G = (G<0) ? 0 : G;
             G = (unsigned char)tmp;
             //R
             tmp = MR(Y, U, V);
             //R = (tmp > 255) ? 255 : (char)tmp;
             //R = (R<0) ? 0 : R;
             R = (unsigned char)tmp;


             *pBGR     = R;
             *(pBGR+1) = G;
             *(pBGR+2) = B;


             if ( i%2 == 0 && j%2 == 0)
             {
                 *pU++;
                 //*pV++;
             }
             else
             {
                 if ( j%2 == 0 )
                 {
                     *pV++ ;
                 }
             }
         }

     }
 }