static int thp_read_header(AVFormatContext *s)
{
    ThpDemuxContext *thp = s->priv_data;
    AVStream *st;
    AVIOContext *pb = s->pb;
    int64_t fsize= avio_size(pb);
    int i;

    /* Read the file header.  */
                           avio_rb32(pb); /* Skip Magic.  */
    thp->version         = avio_rb32(pb);

                           avio_rb32(pb); /* Max buf size.  */
                           avio_rb32(pb); /* Max samples.  */

    thp->fps             = av_d2q(av_int2float(avio_rb32(pb)), INT_MAX);
    thp->framecnt        = avio_rb32(pb);
    thp->first_framesz   = avio_rb32(pb);
    pb->maxsize          = avio_rb32(pb);
    if(fsize>0 && (!pb->maxsize || fsize < pb->maxsize))
        pb->maxsize= fsize;

    thp->compoff         = avio_rb32(pb);
                           avio_rb32(pb); /* offsetDataOffset.  */
    thp->first_frame     = avio_rb32(pb);
    thp->last_frame      = avio_rb32(pb);

    thp->next_framesz    = thp->first_framesz;
    thp->next_frame      = thp->first_frame;

    /* Read the component structure.  */
    avio_seek (pb, thp->compoff, SEEK_SET);
    thp->compcount       = avio_rb32(pb);

    /* Read the list of component types.  */
    avio_read(pb, thp->components, 16);

    for (i = 0; i < thp->compcount; i++) {
        if (thp->components[i] == 0) {
            if (thp->vst)
                break;

            /* Video component.  */
            st = avformat_new_stream(s, NULL);
            if (!st)
                return AVERROR(ENOMEM);

            /* The denominator and numerator are switched because 1/fps
               is required.  */
            avpriv_set_pts_info(st, 64, thp->fps.den, thp->fps.num);
            st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
            st->codecpar->codec_id = AV_CODEC_ID_THP;
            st->codecpar->codec_tag = 0;  /* no fourcc */
            st->codecpar->width = avio_rb32(pb);
            st->codecpar->height = avio_rb32(pb);
            st->codecpar->sample_rate = av_q2d(thp->fps);
            st->nb_frames =
            st->duration = thp->framecnt;
            thp->vst = st;
            thp->video_stream_index = st->index;

            if (thp->version == 0x11000)
                avio_rb32(pb); /* Unknown.  */
        } else if (thp->components[i] == 1) {
            if (thp->has_audio != 0)
                break;

            /* Audio component.  */
            st = avformat_new_stream(s, NULL);
            if (!st)
                return AVERROR(ENOMEM);

            st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
            st->codecpar->codec_id = AV_CODEC_ID_ADPCM_THP;
            st->codecpar->codec_tag = 0;  /* no fourcc */
            st->codecpar->channels    = avio_rb32(pb); /* numChannels.  */
            st->codecpar->sample_rate = avio_rb32(pb); /* Frequency.  */
            st->duration           = avio_rb32(pb);

            avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);

            thp->audio_stream_index = st->index;
            thp->has_audio = 1;
        }
    }

    return 0;
}