Function sdp_read_header

libavformat/rtsp.c:2030–2074

#define SDP_MAX_SIZE 8192

static int sdp_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
    RTSPState *rt = s->priv_data;
    RTSPStream *rtsp_st;
    int size, i, err;
    char *content;
    char url[1024];

    if (!ff_network_init())
        return AVERROR(EIO);

    /* read the whole sdp file */
    /* XXX: better loading */
    content = av_malloc(SDP_MAX_SIZE);
    size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
    if (size <= 0) {
        av_free(content);
        return AVERROR_INVALIDDATA;
    }
    content[size] ='\0';

    sdp_parse(s, content);
    av_free(content);

    /* open each RTP stream */
    for (i = 0; i < rt->nb_rtsp_streams; i++) {
        rtsp_st = rt->rtsp_streams[i];

        ff_url_join(url, sizeof(url), "rtp", NULL,
                    inet_ntoa(rtsp_st->sdp_ip), rtsp_st->sdp_port,
                    "?localport=%d&ttl=%d", rtsp_st->sdp_port,
                    rtsp_st->sdp_ttl);
        if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
            err = AVERROR_INVALIDDATA;
            goto fail;
        }
        if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
            goto fail;
    }
    return 0;
fail:
    ff_rtsp_close_streams(s);
    ff_network_close();
    return err;
}

static int sdp_read_close(AVFormatContext *s)
{