[Bug 645011] New: multiudpsink does not support setting a socket interface

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=645011
  GStreamer | gst-plugins-good | 0.10.x

           Summary: multiudpsink does not support setting a socket
                    interface
    Classification: Desktop
           Product: GStreamer
           Version: 0.10.x
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: ludovica at axis.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
      GNOME target: ---
     GNOME version: ---


Created an attachment (id=183620)
 View: https://bugzilla.gnome.org/attachment.cgi?id=183620
 Review: https://bugzilla.gnome.org/review?bug=645011&attachment=183620

Patch to add an interface_ipv4 prop to multiudpsink

Multiudpsink creates a socket through which the multicast traffic is sent. The
interface used is automatically the default system interface.

This patch introduces a new property called interface_ipv4. If set, the ipv4
address specified becomes the origin of the multicast traffic (using the
setsockopt option IP_MULTICAST_IF, and if the address is a valid interface).

I looked carefully at ipv4 vs. ipv6. However the behavior of setsockopt doesn't
seem to be consistent when it comes to checking the socket family and the data
given. This is why I explicitely call this prop "_ipv4".

I attach a patch for this feature.

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