Function hls_read_header

libavformat/hls.c:2144–2443

}

static int hls_read_header(AVFormatContext *s)
{
    HLSContext *c = s->priv_data;
    int ret = 0, i;
    int64_t highest_cur_seq_no = 0;

    c->ctx                = s;
    c->interrupt_callback = &s->interrupt_callback;

    c->first_packet = 1;
    c->first_timestamp = AV_NOPTS_VALUE;
    c->cur_timestamp = AV_NOPTS_VALUE;

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

    /* XXX: Some HLS servers don't like being sent the range header,
       in this case, we need to set http_seekable = 0 to disable
       the range header */
    av_dict_set_int(&c->avio_opts, "seekable", c->http_seekable, 0);

    if ((ret = parse_playlist(c, s->url, NULL, s->pb)) < 0)
        return ret;

    if (c->n_variants == 0) {
        av_log(s, AV_LOG_WARNING, "Empty playlist\n");
        return AVERROR_EOF;
    }
    /* If the playlist only contained playlists (Master Playlist),
     * parse each individual playlist. */
    if (c->n_playlists > 1 || c->playlists[0]->n_segments == 0) {
        for (i = 0; i < c->n_playlists; i++) {
            struct playlist *pls = c->playlists[i];
            pls->m3u8_hold_counters = 0;
            if ((ret = parse_playlist(c, pls->url, pls, NULL)) < 0) {
                av_log(s, AV_LOG_WARNING, "parse_playlist error %s [%s]\n", av_err2str(ret), pls->url);
                pls->broken = 1;
                if (c->n_playlists > 1)
                    continue;
                return ret;
            }
        }
    }

    for (i = 0; i < c->n_variants; i++) {
        if (c->variants[i]->playlists[0]->n_segments == 0) {
            av_log(s, AV_LOG_WARNING, "Empty segment [%s]\n", c->variants[i]->playlists[0]->url);
            c->variants[i]->playlists[0]->broken = 1;
        }
    }

    /* If this isn't a live stream, calculate the total duration of the
     * stream. */
    if (c->variants[0]->playlists[0]->finished) {
        int64_t duration = 0;
        for (i = 0; i < c->variants[0]->playlists[0]->n_segments; i++)
            duration += c->variants[0]->playlists[0]->segments[i]->duration;
        s->duration = duration;