static inline int vc1_i_pred_dc(MpegEncContext *s, int overlap, int pq, int n, int16_t **dc_val_ptr, int *dir_ptr) { int a, b, c, wrap, pred, scale; int16_t *dc_val; static const uint16_t dcpred[32] = { -1, 1024, 512, 341, 256, 205, 171, 146, 128, 114, 102, 93, 85, 79, 73, 68, 64, 60, 57, 54, 51, 49, 47, 45, 43, 41, 39, 38, 37, 35, 34, 33 }; /* find prediction - wmv3_dc_scale always used here in fact */ if (n < 4) scale = s->y_dc_scale; else scale = s->c_dc_scale; wrap = s->block_wrap[n]; dc_val= s->dc_val[0] + s->block_index[n]; /* B A * C X */ c = dc_val[ - 1]; b = dc_val[ - 1 - wrap]; a = dc_val[ - wrap]; if (pq < 9 || !overlap) { /* Set outer values */ if (!s->mb_y && (n!=2 && n!=3)) b=a=dcpred[scale]; if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=dcpred[scale]; } else { /* Set outer values */ if (!s->mb_y && (n!=2 && n!=3)) b=a=0; if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=0; } if (abs(a - b) <= abs(b - c)) { pred = c; *dir_ptr = 1;//left } else { pred = a; *dir_ptr = 0;//top } /* update predictor */ *dc_val_ptr = &dc_val[0]; return pred; }