[FFmpeg-cvslog] udp: Clarify the comment about binding the multicast address

[Martin Storsjö]

ffmpeg | branch: master | Martin Storsjö <martin at martin.st> | Thu Mar  8 15:15:11 2012 +0200| [1b89bcdd7f12602d8ae9cadc8486f7b0d70e9704] | committer: Martin Storsjö

udp: Clarify the comment about binding the multicast address

Signed-off-by: Martin Storsjö <martin at martin.st>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=1b89bcdd7f12602d8ae9cadc8486f7b0d70e9704
---

 libavformat/udp.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/libavformat/udp.c b/libavformat/udp.c
index 12de48c..e91b95c 100644
--- a/libavformat/udp.c
+++ b/libavformat/udp.c
@@ -380,7 +380,9 @@ static int udp_open(URLContext *h, const char *uri, int flags)
             goto fail;
     }
 
-    /* if multicast, try the multicast address bind first */
+    /* If multicast, try binding the multicast address first, to avoid
+     * receiving UDP packets from other sources aimed at the same UDP
+     * port. This fails on windows. */
     if (s->is_multicast && (h->flags & AVIO_FLAG_READ)) {
         bind_ret = bind(udp_fd,(struct sockaddr *)&s->dest_addr, len);
     }