get_limits(s, &range, &xmin, &ymin, &xmax, &ymax, s->f_code);
get_limits(s, &range, &xmin, &ymin, &xmax, &ymax);
int ff_pre_estimate_p_frame_motion(MpegEncContext * s,                                    int mb_x, int mb_y){    int mx, my, range, dmin;    int xmin, ymin, xmax, ymax;    int rel_xmin, rel_ymin, rel_xmax, rel_ymax;    int pred_x=0, pred_y=0;    int P[10][2];    const int shift= 1+s->quarter_sample;    uint16_t * const mv_penalty= s->me.mv_penalty[s->f_code] + MAX_MV;    const int mv_stride= s->mb_width + 2;    const int xy= mb_x + 1 + (mb_y + 1)*mv_stride;        assert(s->quarter_sample==0 || s->quarter_sample==1);    s->me.pre_penalty_factor    = get_penalty_factor(s, s->avctx->me_pre_cmp);    get_limits(s, &range, &xmin, &ymin, &xmax, &ymax, s->f_code);    rel_xmin= xmin - mb_x*16;    rel_xmax= xmax - mb_x*16;    rel_ymin= ymin - mb_y*16;    rel_ymax= ymax - mb_y*16;    s->me.skip=0;    P_LEFT[0]       = s->p_mv_table[xy + 1][0];    P_LEFT[1]       = s->p_mv_table[xy + 1][1];    if(P_LEFT[0]       < (rel_xmin<<shift)) P_LEFT[0]       = (rel_xmin<<shift);    /* special case for first line */    if (mb_y == s->mb_height-1) {        pred_x= P_LEFT[0];        pred_y= P_LEFT[1];        P_TOP[0]= P_TOPRIGHT[0]= P_MEDIAN[0]=        P_TOP[1]= P_TOPRIGHT[1]= P_MEDIAN[1]= 0; //FIXME     } else {        P_TOP[0]      = s->p_mv_table[xy + mv_stride    ][0];        P_TOP[1]      = s->p_mv_table[xy + mv_stride    ][1];        P_TOPRIGHT[0] = s->p_mv_table[xy + mv_stride - 1][0];        P_TOPRIGHT[1] = s->p_mv_table[xy + mv_stride - 1][1];        if(P_TOP[1]      < (rel_ymin<<shift)) P_TOP[1]     = (rel_ymin<<shift);        if(P_TOPRIGHT[0] > (rel_xmax<<shift)) P_TOPRIGHT[0]= (rel_xmax<<shift);        if(P_TOPRIGHT[1] < (rel_ymin<<shift)) P_TOPRIGHT[1]= (rel_ymin<<shift);            P_MEDIAN[0]= mid_pred(P_LEFT[0], P_TOP[0], P_TOPRIGHT[0]);        P_MEDIAN[1]= mid_pred(P_LEFT[1], P_TOP[1], P_TOPRIGHT[1]);        pred_x = P_MEDIAN[0];        pred_y = P_MEDIAN[1];    }    dmin = s->me.pre_motion_search(s, 0, &mx, &my, P, pred_x, pred_y, rel_xmin, rel_ymin, rel_xmax, rel_ymax,                                    &s->last_picture, s->p_mv_table, (1<<16)>>shift, mv_penalty);    s->p_mv_table[xy][0] = mx<<shift;    s->p_mv_table[xy][1] = my<<shift;        return dmin;}