"SETUP %s RTSP/1.0\n" "Transport: %s\n",
"SETUP %s RTSP/1.0\r\n" "Transport: %s\r\n",
static int rtsp_read_header(AVFormatContext *s,                            AVFormatParameters *ap){    RTSPState *rt = s->priv_data;    char host[1024], path[1024], tcpname[1024], cmd[2048];    URLContext *rtsp_hd;    int port, i, ret, err;    RTSPHeader reply1, *reply = &reply1;    unsigned char *content = NULL;    AVStream *st;    RTSPStream *rtsp_st;    int protocol_mask;    rtsp_abort_req = 0;        /* extract hostname and port */    url_split(NULL, 0,              host, sizeof(host), &port, path, sizeof(path), s->filename);    if (port < 0)        port = RTSP_DEFAULT_PORT;    /* open the tcp connexion */    snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);    if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)        return AVERROR_IO;    rt->rtsp_hd = rtsp_hd;    rt->seq = 0;        /* describe the stream */    snprintf(cmd, sizeof(cmd),              "DESCRIBE %s RTSP/1.0\n"             "Accept: application/sdp\n",             s->filename);    rtsp_send_cmd(s, cmd, reply, &content);    if (!content) {        err = AVERROR_INVALIDDATA;        goto fail;    }    if (reply->status_code != RTSP_STATUS_OK) {        err = AVERROR_INVALIDDATA;        goto fail;    }            /* now we got the SDP description, we parse it */    ret = sdp_parse(s, (const char *)content);    av_freep(&content);    if (ret < 0) {        err = AVERROR_INVALIDDATA;        goto fail;    }        protocol_mask = rtsp_default_protocols;    /* for each stream, make the setup request */    /* XXX: we assume the same server is used for the control of each       RTSP stream */    for(i=0;i<s->nb_streams;i++) {        char transport[2048];        AVInputFormat *fmt;        st = s->streams[i];        rtsp_st = st->priv_data;        /* compute available transports */        transport[0] = '\0';        /* RTP/UDP */        if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP)) {            char buf[256];            int j;            /* first try in specified port range */            if (rtsp_rtp_port_min != 0) {                for(j=rtsp_rtp_port_min;j<=rtsp_rtp_port_max;j++) {                    snprintf(buf, sizeof(buf), "rtp://?localport=%d", j);                    if (!av_open_input_file(&rtsp_st->ic, buf,                                             &rtp_demux, 0, NULL))                        goto rtp_opened;                }            }            /* then try on any port */            if (av_open_input_file(&rtsp_st->ic, "rtp://",                                        &rtp_demux, 0, NULL) < 0) {                    err = AVERROR_INVALIDDATA;                    goto fail;            }        rtp_opened:            port = rtp_get_local_port(url_fileno(&rtsp_st->ic->pb));            if (transport[0] != '\0')                pstrcat(transport, sizeof(transport), ",");            snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,                     "RTP/AVP/UDP;unicast;client_port=%d-%d",                     port, port + 1);        }        /* RTP/TCP */        if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_TCP)) {            if (transport[0] != '\0')                pstrcat(transport, sizeof(transport), ",");            snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,                     "RTP/AVP/TCP");        }        if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP_MULTICAST)) {            if (transport[0] != '\0')                pstrcat(transport, sizeof(transport), ",");            snprintf(transport + strlen(transport),                      sizeof(transport) - strlen(transport) - 1,                     "RTP/AVP/UDP;multicast");        }                snprintf(cmd, sizeof(cmd),                  "SETUP %s RTSP/1.0\n"                 "Transport: %s\n",                 rtsp_st->control_url, transport);        rtsp_send_cmd(s, cmd, reply, NULL);        if (reply->status_code != RTSP_STATUS_OK ||            reply->nb_transports != 1) {            err = AVERROR_INVALIDDATA;            goto fail;        }        /* XXX: same protocol for all streams is required */        if (i > 0) {            if (reply->transports[0].protocol != rt->protocol) {                err = AVERROR_INVALIDDATA;                goto fail;            }        } else {            rt->protocol = reply->transports[0].protocol;        }        /* close RTP connection if not choosen */        if (reply->transports[0].protocol != RTSP_PROTOCOL_RTP_UDP &&            (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP))) {            av_close_input_file(rtsp_st->ic);            rtsp_st->ic = NULL;        }        switch(reply->transports[0].protocol) {        case RTSP_PROTOCOL_RTP_TCP:            fmt = &rtp_demux;            if (av_open_input_file(&rtsp_st->ic, "null", fmt, 0, NULL) < 0) {                err = AVERROR_INVALIDDATA;                goto fail;            }            rtsp_st->interleaved_min = reply->transports[0].interleaved_min;            rtsp_st->interleaved_max = reply->transports[0].interleaved_max;            break;                    case RTSP_PROTOCOL_RTP_UDP:            {                char url[1024];                                /* XXX: also use address if specified */                snprintf(url, sizeof(url), "rtp://%s:%d",                          host, reply->transports[0].server_port_min);                if (rtp_set_remote_url(url_fileno(&rtsp_st->ic->pb), url) < 0) {                    err = AVERROR_INVALIDDATA;                    goto fail;                }            }            break;        case RTSP_PROTOCOL_RTP_UDP_MULTICAST:            {                char url[1024];                int ttl;                fmt = &rtp_demux;                ttl = reply->transports[0].ttl;                if (!ttl)                    ttl = 16;                snprintf(url, sizeof(url), "rtp://%s:%d?multicast=1&ttl=%d",                          host,                          reply->transports[0].server_port_min,                         ttl);                if (av_open_input_file(&rtsp_st->ic, url, fmt, 0, NULL) < 0) {                    err = AVERROR_INVALIDDATA;                    goto fail;                }            }            break;        }    }    /* use callback if available to extend setup */    if (ff_rtsp_callback) {        if (ff_rtsp_callback(RTSP_ACTION_CLIENT_SETUP, rt->session_id,                              NULL, 0, rt->last_reply) < 0) {            err = AVERROR_INVALIDDATA;            goto fail;        }    }                             /* start playing */    snprintf(cmd, sizeof(cmd),              "PLAY %s RTSP/1.0\n",             s->filename);    rtsp_send_cmd(s, cmd, reply, NULL);    if (reply->status_code != RTSP_STATUS_OK) {        err = AVERROR_INVALIDDATA;        goto fail;    }    /* open TCP with bufferized input */    if (rt->protocol == RTSP_PROTOCOL_RTP_TCP) {        if (url_fdopen(&rt->rtsp_gb, rt->rtsp_hd) < 0) {            err = AVERROR_NOMEM;            goto fail;        }    }    return 0; fail:    for(i=0;i<s->nb_streams;i++) {        st = s->streams[i];        rtsp_st = st->priv_data;        if (rtsp_st) {            if (rtsp_st->ic)                av_close_input_file(rtsp_st->ic);        }        av_free(rtsp_st);    }    av_freep(&content);    url_close(rt->rtsp_hd);    return err;}