[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 #6 from Stefan Sauer (gstreamer, gtkdoc dev) <ensonic at sonicpulse.de> 2014-10-02 19:40:21 UTC ---
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"].

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