1  typedef unsigned char uint8_t;
       2  extern uint8_t ff_cropTbl[256 + 2 * 1024];
       3  
       4  void ff_pred8x8_plane_c(uint8_t *src, int stride){
       5    int j, k;
       6    int a;
       7    uint8_t *cm = ff_cropTbl + 1024;
       8    const uint8_t * const src0 = src+3-stride;
       9    const uint8_t *src1 = src+4*stride-1;
      10    const uint8_t *src2 = src1-2*stride;
      11    int H = src0[1] - src0[-1];
      12    int V = src1[0] - src2[ 0];
      13    for(k=2; k<=4; ++k) {
      14      src1 += stride; src2 -= stride;
      15      H += k*(src0[k] - src0[-k]);
      16      V += k*(src1[0] - src2[ 0]);
      17    }
      18    H = ( 17*H+16 ) >> 5;
      19    V = ( 17*V+16 ) >> 5;
      20  
      21    a = 16*(src1[0] + src2[8]+1) - 3*(V+H);
      22    for(j=8; j>0; --j) {
      23      int b = a;
      24      a += V;
      25      src[0] = cm[ (b ) >> 5 ];
      26      src[1] = cm[ (b+ H) >> 5 ];
      27      src[2] = cm[ (b+2*H) >> 5 ];
      28      src[3] = cm[ (b+3*H) >> 5 ];
      29      src[4] = cm[ (b+4*H) >> 5 ];
      30      src[5] = cm[ (b+5*H) >> 5 ];
      31      src[6] = cm[ (b+6*H) >> 5 ];
      32      src[7] = cm[ (b+7*H) >> 5 ];
      33      src += stride;
      34    }
      35  }