int ff_h264_fill_default_ref_list(H264Context *h){
    MpegEncContext * const s = &h->s;
    int i, len;

    if(h->slice_type_nos==FF_B_TYPE){
        Picture *sorted[32];
        int cur_poc, list;
        int lens[2];

        if(FIELD_PICTURE)
            cur_poc= s->current_picture_ptr->field_poc[ s->picture_structure == PICT_BOTTOM_FIELD ];
        else
            cur_poc= s->current_picture_ptr->poc;

        for(list= 0; list<2; list++){
            len= add_sorted(sorted    , h->short_ref, h->short_ref_count, cur_poc, 1^list);
            len+=add_sorted(sorted+len, h->short_ref, h->short_ref_count, cur_poc, 0^list);
            assert(len<=32);
            len= build_def_list(h->default_ref_list[list]    , sorted     , len, 0, s->picture_structure);
            len+=build_def_list(h->default_ref_list[list]+len, h->long_ref, 16 , 1, s->picture_structure);
            assert(len<=32);

            if(len < h->ref_count[list])
                memset(&h->default_ref_list[list][len], 0, sizeof(Picture)*(h->ref_count[list] - len));
            lens[list]= len;
        }

        if(lens[0] == lens[1] && lens[1] > 1){
            for(i=0; h->default_ref_list[0][i].data[0] == h->default_ref_list[1][i].data[0] && i<lens[0]; i++);
            if(i == lens[0])
                FFSWAP(Picture, h->default_ref_list[1][0], h->default_ref_list[1][1]);
        }
    }else{
        len = build_def_list(h->default_ref_list[0]    , h->short_ref, h->short_ref_count, 0, s->picture_structure);
        len+= build_def_list(h->default_ref_list[0]+len, h-> long_ref, 16                , 1, s->picture_structure);
        assert(len <= 32);
        if(len < h->ref_count[0])
            memset(&h->default_ref_list[0][len], 0, sizeof(Picture)*(h->ref_count[0] - len));
    }
#ifdef TRACE
    for (i=0; i<h->ref_count[0]; i++) {
        tprintf(h->s.avctx, "List0: %s fn:%d 0x%p\n", (h->default_ref_list[0][i].long_ref ? "LT" : "ST"), h->default_ref_list[0][i].pic_id, h->default_ref_list[0][i].data[0]);
    }
    if(h->slice_type_nos==FF_B_TYPE){
        for (i=0; i<h->ref_count[1]; i++) {
            tprintf(h->s.avctx, "List1: %s fn:%d 0x%p\n", (h->default_ref_list[1][i].long_ref ? "LT" : "ST"), h->default_ref_list[1][i].pic_id, h->default_ref_list[1][i].data[0]);
        }
    }
#endif
    return 0;
}