1  int abs (int);
       2  int find_sad_16x16(int *intra_mode)
       3  {
       4    int current_intra_sad_2,best_intra_sad2;
       5    int M1[16][16],M0[4][4][4][4],M3[4],M4[4][4];
       6    int i,j,k;
       7    int ii,jj;
       8    int up_avail, left_avail, left_up_avail;
       9    for (i=0;i<17;i++)
      10      if (left_up_avail)
      11        {
      12  	for (jj=0;jj<4;jj++)
      13  	  for (ii=0;ii<4;ii++)
      14  	    for (j=0;j<4;j++)
      15  	      for (i=0;i<4;i++)
      16  		{
      17  		  M0[i][ii][2][jj]=M3[0]-M3[1];
      18  		  M0[i][ii][1][jj]=M3[2]+M3[3];
      19  		  current_intra_sad_2 += abs(M0[i][ii][j][jj]);
      20  		}
      21  
      22          if(current_intra_sad_2 < best_intra_sad2)
      23            best_intra_sad2=current_intra_sad_2;
      24        }
      25  }