Function ff_rtsp_make_setup_request

libavformat/rtsp.c:1599–1860

}

int ff_rtsp_make_setup_request(AVFormatContext *s, const char *host, int port,
                              int lower_transport, const char *real_challenge)
{
    RTSPState *rt = s->priv_data;
    int rtx = 0, j, i, err, interleave = 0, port_off = 0;
    RTSPStream *rtsp_st;
    RTSPMessageHeader reply1, *reply = &reply1;
    char cmd[MAX_URL_SIZE];
    const char *trans_pref;

    memset(&reply1, 0, sizeof(reply1));

    if (rt->transport == RTSP_TRANSPORT_RDT)
        trans_pref = "x-pn-tng";
    else if (rt->transport == RTSP_TRANSPORT_RAW)
        trans_pref = "RAW/RAW";
    else
        trans_pref = "RTP/AVP";

    /* default timeout: 1 minute */
    rt->timeout = 60;

    /* Choose a random starting offset within the first half of the
     * port range, to allow for a number of ports to try even if the offset
     * happens to be at the end of the random range. */
    if (rt->rtp_port_max - rt->rtp_port_min >= 4) {
        port_off = av_get_random_seed() % ((rt->rtp_port_max - rt->rtp_port_min)/2);
        /* even random offset */
        port_off -= port_off & 0x01;
    }

    for (j = rt->rtp_port_min + port_off, i = 0; i < rt->nb_rtsp_streams; ++i) {
        char transport[MAX_URL_SIZE];

        /*
         * WMS serves all UDP data over a single connection, the RTX, which
         * isn't necessarily the first in the SDP but has to be the first
         * to be set up, else the second/third SETUP will fail with a 461.
         */
        if (lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
             rt->server_type == RTSP_SERVER_WMS) {
            if (i == 0) {
                /* rtx first */
                for (rtx = 0; rtx < rt->nb_rtsp_streams; rtx++) {
                    int len = strlen(rt->rtsp_streams[rtx]->control_url);
                    if (len >= 4 &&
                        !strcmp(rt->rtsp_streams[rtx]->control_url + len - 4,
                                "/rtx"))
                        break;
                }
                if (rtx == rt->nb_rtsp_streams)
                    return -1; /* no RTX found */
                rtsp_st = rt->rtsp_streams[rtx];
            } else
                rtsp_st = rt->rtsp_streams[i > rtx ? i : i - 1];
        } else
            rtsp_st = rt->rtsp_streams[i];