See https://datatracker.ietf.org/doc/html/draft-ietf-rmcat-gcc-02
This commit implements the bandwidth estimation as a GStreamer element
that is then used in webrtcbin through the new `request-bandwidth-estimator`
signal.
This keeps our Homegrown congestion controller but removes the possibility
to switch CC algorithm at runtime.
As specified in Google Congestion Control we should run the packet loss
estimation algorithm "every time feedback from the receiver is
received".
And, also as defined by GCC, we now have 2 different estimated bitrates,
one for the delay-based controller value and one for the loss-based one,
and we use the minimum value between those 2 as our current estimation.
[GCC]: https://datatracker.ietf.org/doc/html/draft-ietf-rmcat-gcc-02
Under certain circumstances one would like to use a self signed
certificate without the obstacles many browsers implement to
safeguard their users. One approach is to create a certificate
authority. One can now add this to the OS certificate store, or simply
add it to the browser. In the latter case one also needs to specify the
new authority on the webrtcsink. This commit enables this.
Naive heuristic lifted from an earlier proof of concept,
augmented with logic from
https://datatracker.ietf.org/doc/html/draft-ietf-rmcat-gcc-02#section-5.5
A property is exposed to disable congestion control for
testing purposes, it can be extended in the future to allow
selecting a different congestion control scheme.
+ Update the documentation
