[Bug 733187] integrating the tracer branch

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=733187
  GStreamer | gstreamer (core) | 1.x

--- Comment #8 from Thibault Saunier <tsaunier at gnome.org> 2014-10-02 22:57:58 UTC ---
(In reply to comment #6)
> The current code got rid of the var_args. The API also looks like it is
> introspectable, but unfortunately would not work. I am using GCallback to store
> callback, but then cast the callback to the right pointer in the trace probe.
> GI marshal everything to GCallback though.
> 
> What we can do is to add a gst_tracing_register_hook_structure () and make it
> so that the dispatch code only creates a GstStructure if there are callbacks
> that need one. In python picking the args out of the structure is easy, e.g.
> args["pad"].

That new API looks good now, and it is most probably as lightweight as the old
one.

I can imagine people wanting to implement tracer in other language than C, but
right it is not high priority for now I would say.

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