func: static void h261_v_loop_filter_c(uint8_t *dest,uint8_t *src, int stride){
  
      int i,j,xy,yz;
  
      int res;
  
      for(i=0; i<8; i++){
  
          for(j=1; j<7; j++){
  
              xy = j * stride + i;
  
              yz = j * 8 + i;
  
              res = (int)src[yz-1*8] + ((int)(src[yz+0*8]) * 2) + (int)src[yz+1*8];
  
              res +=2;
  
              res >>=2;
  
              dest[xy] = (uint8_t)res;
  
          }
  
      }
  
  }
  