[Bug 752774] srtpenc: improve performance

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752774

--- Comment #6 from Olivier Crête <olivier.crete at ocrete.ca> ---
To remove that copy, we'd need a way to request padding from the element that
allocated the buffer, but we currently don't have that implemented anywhere. We
could possibly do that with the allocation params in the reply to the
allocation query. That said, I don't think this is implemented by any of the
payloaders. They could in turn request a prefix from the encoder, so that the
whole thing can be done in place.. But none of this is trivial, and it may not
be worth it.

Another option would be to make the srtp library understand scattered memory
and just append another buffer for the suffix.

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