[Bug 766898] player: Add a message queue API in addition to the signals

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=766898

--- Comment #25 from Stephan Hesse <tchakabam at gmail.com> ---
Yes :) 

The main work on the signal adapter thingie is done. As in "should work". Need
to do the slightly boring work of mapping all signal data to all messages now.

Here is the current diff from my feature branch against master:
https://github.com/GStreamer/gst-plugins-bad/compare/master...tchakabam:feature/player-api-message-bus?expand=1

Finally, I still need to integrate all of your comments fully. Those or mainly
removing the transient-state vars and instead building all message data
in-place in the respective internal callbacks. And also the ref-counting issue
on the bus getter.

You can already take a look at the existing patch, since it is already quite a
bit to review maybe, and this *should* be almost finished..

We should also create a patch that updates gst-examples using this API, so we
can validate fully that the current signal-adapter approach works.

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