[Bug 769768] rtpjitterbuffer: lots of improvements around RTX

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=769768

--- Comment #10 from Håvard Graff (hgr) <havard.graff at gmail.com> ---
Created attachment 333146
  --> https://bugzilla.gnome.org/attachment.cgi?id=333146&action=edit
improved rtx-rtt averaging

As this patch was a little short on an explanation, I might add something here.
The basic idea is this:
1. For *larger* rtx-rtt, weigh a new measurement as before
2. For *smaller* rtx-rtt, be a bit more conservative and weigh a bit less
3. For very large measurements, consider them "outliers" and count them a lot
less

The idea being that reducing the rtx-rtt is much more harmful then increasing
it, since we don't want to be underestimating the rtt of the network, and when
using this number to estimate the latency you need for you jitterbuffer, you
would rather want it to be a bit larger then a bit smaller, potentially losing
rtx-packets. The "outlier-detector" is there to prevent a single skewed
measurement to affect the outcome too much. On wireless networks, these are
surprisingly common.

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