[Bug 707042] New: udpsrc binds to INADDR_ANY instead of multicast group address

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=707042
  GStreamer | gst-plugins-good | 1.x

           Summary: udpsrc binds to INADDR_ANY instead of multicast group
                    address
    Classification: Platform
           Product: GStreamer
           Version: 1.x
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: baldur at oz.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


udpsrc binds to INADDR_ANY instead of binding to the multicast group address as
is the correct behaviour on Linux.
Binding to INADDR_ANY makes it impossible to join two groups on the same
machine, receiving data on the same port, as the Linux kernel will not
discriminate packets based on multicast group joined.

Caveat: The Windows IP stack does not allow binding to a multicast group
address but does discriminate packets based on group address when joined to a
multicast group.

Test:
gst-launch-1.0 udpsrc uri=udp://239.192.192.192:1234

And in another terminal:
$ lsof  | grep 1234
gst-launc 13774          medizza    5u     IPv4            4586602      0t0    
 UDP *:1234
udpsrc0:s 13774 13775    medizza    5u     IPv4            4586602      0t0    
 UDP *:1234
gmain     13774 13776    medizza    5u     IPv4            4586602      0t0    
 UDP *:1234

While compared to another application that has the correct behaviour:
$ lsof  | grep 5500
recordmca 13897          medizza    3u     IPv4            4587787      0t0    
 UDP 239.192.192.192:1234

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