[Bug 727067] udpsrc: set udp buffer size forcibly

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=727067

--- Comment #33 from Nicolas Dufresne (ndufresne) <nicolas at ndufresne.ca> ---
Created attachment 373407
  --> https://bugzilla.gnome.org/attachment.cgi?id=373407&action=edit
udpsrc: Balance Linux value of get/set_rcvbuf

On Linux, the kernel returns twice the size as it will allocate extra
space for accouting. We devides this value by two in order to ensure
that get/set value now match. This fixes the set buffer size validation
and allow having a nice warning when the size if surpassed and the
process does not have CAP_NET_ADMIN capabilities.

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