Add a function rtsp_setup_output_streams for announcing the SDP

and setting up the internal RTSPStream data structures when using
the RTSP code in muxer mode.

Originally committed as revision 21965 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/rtsp.c

@@ -1349,6 +1349,54 @@ static int rtsp_setup_input_streams(AVFormatContext *s)
     return 0;
 }
 
+static int rtsp_setup_output_streams(AVFormatContext *s)
+{
+    RTSPState *rt = s->priv_data;
+    RTSPMessageHeader reply1, *reply = &reply1;
+    char cmd[1024];
+    int i;
+    char *sdp;
+
+    /* Announce the stream */
+    snprintf(cmd, sizeof(cmd),
+             "ANNOUNCE %s RTSP/1.0\r\n"
+             "Content-Type: application/sdp\r\n",
+             s->filename);
+    sdp = av_mallocz(8192);
+    if (sdp == NULL)
+        return AVERROR(ENOMEM);
+    if (avf_sdp_create(&s, 1, sdp, 8192)) {
+        av_free(sdp);
+        return AVERROR_INVALIDDATA;
+    }
+    av_log(s, AV_LOG_INFO, "SDP:\n%s\n", sdp);
+    rtsp_send_cmd_with_content(s, cmd, reply, NULL, sdp, strlen(sdp));
+    av_free(sdp);
+    if (reply->status_code != RTSP_STATUS_OK)
+        return AVERROR_INVALIDDATA;
+
+    /* Set up the RTSPStreams for each AVStream */
+    for (i = 0; i < s->nb_streams; i++) {
+        RTSPStream *rtsp_st;
+        AVStream *st = s->streams[i];
+
+        rtsp_st = av_mallocz(sizeof(RTSPStream));
+        if (!rtsp_st)
+            return AVERROR(ENOMEM);
+        dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
+
+        st->priv_data = rtsp_st;
+        rtsp_st->stream_index = i;
+
+        av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url));
+        /* Note, this must match the relative uri set in the sdp content */
+        av_strlcatf(rtsp_st->control_url, sizeof(rtsp_st->control_url),
+                    "/streamid=%d", i);
+    }
+
+    return 0;
+}
+
 static int rtsp_connect(AVFormatContext *s)
 {
     RTSPState *rt = s->priv_data;
@@ -1406,6 +1454,17 @@ redirect:
     if (!lower_transport_mask)
         lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_NB) - 1;
 
+    if (s->oformat) {
+        /* Only UDP output is supported at the moment. */
+        lower_transport_mask &= 1 << RTSP_LOWER_TRANSPORT_UDP;
+        if (!lower_transport_mask) {
+            av_log(s, AV_LOG_ERROR, "Unsupported lower transport method, "
+                                    "only UDP is supported for output.\n");
+            err = AVERROR(EINVAL);
+            goto fail;
+        }
+    }
+
     /* open the tcp connexion */
     snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
     if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0) {
@@ -1455,7 +1514,10 @@ redirect:
         break;
     }
 
+    if (s->iformat)
     err = rtsp_setup_input_streams(s);
+    else
+        err = rtsp_setup_output_streams(s);
     if (err)
         goto fail;