[Bug 753769] srtpenc: add utility for custom RTP packet management before being protected

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=753769

--- Comment #5 from Miguel París Díaz <mparisdiaz at gmail.com> ---
Hello @olivier and @sebastian,
the result is the same that having an element or a pad probe before, but the
point is the efficiency.
Now I am using a pad probe to manage each RTP packet, but to do this stuff
thread-safe I have to make each buffer writable and then map them as
GST_MAP_WRITE.
With this, new copies are made and after a new one is done by srtpenc. Because
of this I want to take advantage of the copy done by srtpenc.

The first idea was using a signal, but it is more efficient use a direct
function call, so I have done this proposal.
I am also thinking about using this mechanism in payloaders for adding custom
RTP extension headers.

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