A function that is in seek-preproc.c

ff_seek_frame_binary.c

int ff_seek_frame_binary(AVFormatContext *s, int stream_index,
                         int64_t target_ts, int flags)
{
    const AVInputFormat *const avif = s->iformat;
    int64_t pos_min=pos_min, pos_max=pos_max, pos, pos_limit;
    int64_t ts_min, ts_max, ts;
    int index;
    int64_t ret; 
    AVStream *st; 
    FFStream *sti;
    if (stream_index < 0) 
        return -1;
    av_log(s, 56, "read_seek: %d %s\n", stream_index, av_ts_make_string((char[32]){0}, target_ts));
    ts_max =
    ts_min = ((int64_t)0x8000000000000000UL);
    pos_limit = -1;
    st = s->streams[stream_index];
    sti = ffstream(st);
    if (sti->index_entries) {
        const AVIndexEntry *e;
        index = av_index_search_timestamp(st, target_ts,
                                          flags | 1);
        index = ((index) > (0) ? (index) : (0));
        e = &sti->index_entries[index];
        if (e->timestamp <= target_ts || e->pos == e->min_distance) {
            pos_min = e->pos;
            ts_min = e->timestamp;
            av_log(s, 56, "using cached pos_min=0x%""l" "x"" dts_min=%s\n",
                    pos_min, av_ts_make_string((char[32]){0}, ts_min));
        } else {
            ((void)0);
        }
        index = av_index_search_timestamp(st, target_ts,
                                          flags & ~1); 
        do { if (!(index < sti->nb_index_entries)) { av_log(((void*)0), 0, "Assertion %s failed at %s:%d\n", "index < sti->nb_index_entries", "src/libavformat/seek.c", 325); abort(); } } while (0); 
        if (index >= 0) { 
            e = &sti->index_entries[index];
            ((void)0);
            pos_max = e->pos;
            ts_max = e->timestamp;
            pos_limit = pos_max - e->min_distance;
            av_log(s, 56, "using cached pos_max=0x%""l" "x"" pos_limit=0x%""l" "x"
                    " dts_max=%s\n", pos_max, pos_limit, av_ts_make_string((char[32]){0}, ts_max));
        }
    }    
    pos = ff_gen_search(s, stream_index, target_ts, pos_min, pos_max, pos_limit,
                        ts_min, ts_max, flags, &ts, avif->read_timestamp);
    if (pos < 0) 
        return -1;
    if ((ret = avio_seek(s->pb, pos, 0)) < 0) 
        return ret; 
    ff_read_frame_flush(s);
    avpriv_update_cur_dts(s, st, ts); 
    return 0;
}