[FFmpeg-devel] [PATCH] libavformat/rtsp: fix rtsp multicasts

[Wolfgang Haupt]

If an rtsp server offers a udp multicast
address as response of a DESCRIBE command
the rtsp client is expected to issue
SETUP with "Transport: RTP/AVP/UDP;multicast".
Some rtsp servers bail out otherwise.
---
 libavformat/rtsp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavformat/rtsp.c b/libavformat/rtsp.c
index 859defa592..3f0cbfc98b 100644
--- a/libavformat/rtsp.c
+++ b/libavformat/rtsp.c
@@ -1913,6 +1913,9 @@ redirect:
                 && (rt->rtsp_flags & RTSP_FLAG_PREFER_TCP))
             lower_transport = RTSP_LOWER_TRANSPORT_TCP;
 
+        if (ff_is_multicast_address((struct sockaddr*)&rt->rtsp_streams[rt->nb_rtsp_streams-1]->sdp_ip))
+            lower_transport = RTSP_LOWER_TRANSPORT_UDP_MULTICAST;
+
         err = ff_rtsp_make_setup_request(s, host, port, lower_transport,
                                  rt->server_type == RTSP_SERVER_REAL ?
                                      real_challenge : NULL);
-- 
2.17.1