[Bug 797305] New: srtp: Add support for MKI

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797305

            Bug ID: 797305
           Summary: srtp: Add support for MKI
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: olivier.crete at ocrete.ca
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Currently, our SRTP elements don't support MKIs. This patch series adds support
for them.

It has 2 parts:

* Encoder

I just added an MKI property and then it puts a "mki" element in the caps with
the MKI in a buffer. This still only allows for one MKI.

* Decoder

This may be a bit more controversial, as I'm allowing multiple MKIs, instead of
having separate CAPS, I'm putting them all in one with "srtp-key=X, mki=X,
mki2=Y, srtp-key2=Y, mki3=Z, srtp-key3=Z", up to 15, which is the maximum
allowed by libsrtp.


The other thing that could be controversial is that support for MKIs were added
in libsrtp 2.1. So I put the whole thing behind ifdeds, included the extra MKI
property. If no one yells, I would be tempted to just drop the ifdefs and
require libsrtp 2.1 at least for everyone.

I'm also attaching a patch against Cerbero to bump libsrtp to 2.2.

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