index = index_search_timestamp(st->index_entries, st->nb_index_entries, timestamp);
index = av_index_search_timestamp(st, timestamp);
static int av_seek_frame_generic(AVFormatContext *s,                                  int stream_index, int64_t timestamp){    int index;    AVStream *st;    AVIndexEntry *ie;    if (!s->index_built) {        if (is_raw_stream(s)) {            av_build_index_raw(s);        } else {            return -1;        }        s->index_built = 1;    }    if (stream_index < 0)        stream_index = 0;    st = s->streams[stream_index];    index = index_search_timestamp(st->index_entries, st->nb_index_entries,                                   timestamp);    if (index < 0)        return -1;    /* now we have found the index, we can seek */    ie = &st->index_entries[index];    av_read_frame_flush(s);    url_fseek(&s->pb, ie->pos, SEEK_SET);    st->cur_dts = ie->timestamp;    return 0;}