Function dash_read_header

libavformat/dashdec.c:2064–2184

}

static int dash_read_header(AVFormatContext *s)
{
    DASHContext *c = s->priv_data;
    struct representation *rep;
    AVProgram *program;
    int ret = 0;
    int stream_index = 0;
    int i;

    c->interrupt_callback = &s->interrupt_callback;

    if ((ret = ffio_copy_url_options(s->pb, &c->avio_opts)) < 0)
        return ret;

    if ((ret = parse_manifest(s, s->url, s->pb)) < 0)
        return ret;

    /* If this isn't a live stream, fill the total duration of the
     * stream. */
    if (!c->is_live) {
        s->duration = (int64_t) c->media_presentation_duration * AV_TIME_BASE;
    } else {
        av_dict_set(&c->avio_opts, "seekable", "0", 0);
    }

    if(c->n_videos)
        c->is_init_section_common_video = is_common_init_section_exist(c->videos, c->n_videos);

    /* Open the demuxer for video and audio components if available */
    for (i = 0; i < c->n_videos; i++) {
        rep = c->videos[i];
        if (i > 0 && c->is_init_section_common_video) {
            ret = copy_init_section(rep, c->videos[0]);
            if (ret < 0)
                return ret;
        }
        ret = open_demux_for_component(s, rep);

        if (ret)
            return ret;
        if (rep->ctx->nb_streams == 0)
            return AVERROR_PATCHWELCOME;
        rep->stream_index = stream_index;
        ++stream_index;
    }

    if(c->n_audios)
        c->is_init_section_common_audio = is_common_init_section_exist(c->audios, c->n_audios);

    for (i = 0; i < c->n_audios; i++) {
        rep = c->audios[i];
        if (i > 0 && c->is_init_section_common_audio) {
            ret = copy_init_section(rep, c->audios[0]);
            if (ret < 0)
                return ret;
        }
        ret = open_demux_for_component(s, rep);