[Bug 730539] sdp: add support for multiple crypto sessions

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=730539
  GStreamer | gst-rtsp-server | git

--- Comment #5 from Wim Taymans <wim.taymans at gmail.com> 2014-07-09 13:53:54 UTC ---
(In reply to comment #4)
> (In reply to comment #3)
> > (In reply to comment #2)
> > > (In reply to comment #1)
> > > > Any chance this and the related bug 730540 will make it for 1.4.0?
> > > 
> > > Unlikely, I would like to rework the SRTP caps properties and try to implement
> > > the ROC counter without a signal.
> > 
> > Does that mean the "roc" field in the caps will dynamically change? With a
> > shared media, new clients can connect and the ROC might have changed. That's
> > why I used a signal, so it's dynamic. But I'm sure I miss something if you say
> > it's possible.
> 
> Actually, the "setter" part is done by passing roc in the caps.

We currently have something similar in the payloaders. In the caps we find the
seqnum and timestamp of the first packet but any time you want to get the
current values, you use the stats property to get a GstStructure of values. It
used to be done with properties but it was hard to get an atomic snapshot of
the seqnum and timestamp and possibly other fields.

So maybe we can do something similar for the ROC and other crypto params? I'm
thinking that you get the stats to get all the fields in a consistent state to
make the MIKEY message.

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