static void asf_build_simple_index(AVFormatContext *s, int stream_index)

{

    ff_asf_guid g;

    ASFContext *asf     = s->priv_data;

    int64_t current_pos = avio_tell(s->pb);

    int i;



    avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);

    ff_get_guid(s->pb, &g);



    /* the data object can be followed by other top-level objects,

     * skip them until the simple index object is reached */

    while (ff_guidcmp(&g, &index_guid)) {

        int64_t gsize = avio_rl64(s->pb);

        if (gsize < 24 || s->pb->eof_reached) {

            avio_seek(s->pb, current_pos, SEEK_SET);

            return;

        }

        avio_skip(s->pb, gsize - 24);

        ff_get_guid(s->pb, &g);

    }



    {

        int64_t itime, last_pos = -1;

        int pct, ict;

        int64_t av_unused gsize = avio_rl64(s->pb);

        ff_get_guid(s->pb, &g);

        itime = avio_rl64(s->pb);

        pct   = avio_rl32(s->pb);

        ict   = avio_rl32(s->pb);

        av_log(s, AV_LOG_DEBUG,

               "itime:0x%"PRIx64", pct:%d, ict:%d\n", itime, pct, ict);



        for (i = 0; i < ict; i++) {

            int pktnum        = avio_rl32(s->pb);

            int pktct         = avio_rl16(s->pb);

            int64_t pos       = s->data_offset + s->packet_size * (int64_t)pktnum;

            int64_t index_pts = FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);



            if (pos != last_pos) {

                av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d  pts: %"PRId64"\n",

                       pktnum, pktct, index_pts);

                av_add_index_entry(s->streams[stream_index], pos, index_pts,

                                   s->packet_size, 0, AVINDEX_KEYFRAME);

                last_pos = pos;

            }

        }

        asf->index_read = ict > 0;

    }

    avio_seek(s->pb, current_pos, SEEK_SET);

}
