static int asf_read_stream_properties(AVFormatContext *s, const GUIDParseTable *g)
{
    ASFContext *asf = s->priv_data;
    AVIOContext *pb = s->pb;
    uint64_t size;
    uint32_t err_data_len, ts_data_len; // type specific data length
    uint16_t flags;
    ff_asf_guid stream_type;
    enum AVMediaType type;
    int i, ret;
    uint8_t stream_index;
    AVStream *st;
    ASFStream *asf_st;

    // ASF file must not contain more than 128 streams according to the specification
    if (asf->nb_streams >= ASF_MAX_STREAMS)
        return AVERROR_INVALIDDATA;

    size = avio_rl64(pb);
    ff_get_guid(pb, &stream_type);
    if (!ff_guidcmp(&stream_type, &ff_asf_audio_stream))
        type = AVMEDIA_TYPE_AUDIO;
    else if (!ff_guidcmp(&stream_type, &ff_asf_video_stream))
        type = AVMEDIA_TYPE_VIDEO;
    else if (!ff_guidcmp(&stream_type, &ff_asf_jfif_media))
        type = AVMEDIA_TYPE_VIDEO;
    else if (!ff_guidcmp(&stream_type, &ff_asf_command_stream))
        type = AVMEDIA_TYPE_DATA;
    else if (!ff_guidcmp(&stream_type,
                         &ff_asf_ext_stream_embed_stream_header))
        type = AVMEDIA_TYPE_UNKNOWN;
    else
        return AVERROR_INVALIDDATA;

    ff_get_guid(pb, &stream_type); // error correction type
    avio_skip(pb, 8); // skip the time offset
    ts_data_len      = avio_rl32(pb);
    err_data_len     = avio_rl32(pb);
    flags            = avio_rl16(pb); // bit 15 - Encrypted Content

    stream_index = flags & ASF_STREAM_NUM;
    for (i = 0; i < asf->nb_streams; i++)
        if (stream_index == asf->asf_st[i]->stream_index) {
            av_log(s, AV_LOG_WARNING,
                   "Duplicate stream found, this stream will be ignored.\n");
            align_position(pb, asf->offset, size);
            return 0;
        }

    st = avformat_new_stream(s, NULL);
    if (!st)
        return AVERROR(ENOMEM);
    avpriv_set_pts_info(st, 32, 1, 1000); // pts should be dword, in milliseconds
    st->codecpar->codec_type = type;
    asf->asf_st[asf->nb_streams] = av_mallocz(sizeof(*asf_st));
    if (!asf->asf_st[asf->nb_streams])
        return AVERROR(ENOMEM);
    asf_st                       = asf->asf_st[asf->nb_streams];
    asf->nb_streams++;
    asf_st->stream_index         = stream_index;
    asf_st->index                = st->index;
    asf_st->indexed              = 0;
    st->id                       = flags & ASF_STREAM_NUM;
    av_init_packet(&asf_st->pkt.avpkt);
    asf_st->pkt.data_size        = 0;
    avio_skip(pb, 4); // skip reserved field

    switch (type) {
    case AVMEDIA_TYPE_AUDIO:
        asf_st->type = AVMEDIA_TYPE_AUDIO;
        if ((ret = ff_get_wav_header(s, pb, st->codecpar, ts_data_len, 0)) < 0)
            return ret;
        break;
    case AVMEDIA_TYPE_VIDEO:
        asf_st->type = AVMEDIA_TYPE_VIDEO;
        if ((ret = parse_video_info(pb, st)) < 0)
            return ret;
        break;
    default:
        avio_skip(pb, ts_data_len);
        break;
    }

    if (err_data_len) {
        if (type == AVMEDIA_TYPE_AUDIO) {
            uint8_t span = avio_r8(pb);
            if (span > 1) {
                asf_st->span              = span;
                asf_st->virtual_pkt_len   = avio_rl16(pb);
                asf_st->virtual_chunk_len = avio_rl16(pb);
                if (!asf_st->virtual_chunk_len || !asf_st->virtual_pkt_len)
                    return AVERROR_INVALIDDATA;
                avio_skip(pb, err_data_len - 5);
            } else
                avio_skip(pb, err_data_len - 1);
        } else
            avio_skip(pb, err_data_len);
    }

    align_position(pb, asf->offset, size);

    return 0;
}