[Bug 752774] srtpenc: improve performance

[GStreamer (GNOME Bugzilla)]

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

--- Comment #5 from Miguel París Díaz <mparisdiaz at gmail.com> ---
OK, I will update the patch to remove these checks instead of adding a
property.

Moreover, there an overhead allocating and moving memory before/after the
encryption. I have seen this into gst_srtp_enc_process_buffer:
  7.5% - gst_buffer_new_allocate
  5.9% - gst_buffer_extract
  2.0% - gst_buffer_set_size
  2.0% - gst_buffer_copy_into
  2.2% - gst_buffer_map

Could be a way of reduce this?
  Can we avoid some of this operations?
  Having a buffer pool or something like that? (for gst_buffer_new_allocate)
  Do you think if this function can be improved?

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