[Bug 791093] add OMX_PERFORMANCE debug category

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=791093

--- Comment #5 from Guillaume Desmottes <gdesmott at gnome.org> ---
(In reply to Tim-Philipp Müller from comment #3)
> Can't you easily get this info from the existing debug log output by
> matching function names?

Kind of, but not for all events.

My goal here was to provide an experience very similar to the hooks/tracer
system. Having a specific debug domain make it easier to turn on/off and allow
us to enable only those logs (which can be useful to reduce the logs overhead
when profiling performances).

I also wanted to make those more parser than human reader friendly. My vague
plan was to use serialized GstStructure if I ever need to pass more infos (like
tracers do).

(In reply to Nicolas Dufresne (stormer) from comment #2)
> Review of attachment 364765 [details] [review]:
> 
> What's the use for this if you cannot match the buffers ? Should't you print
> the buffer pointer, or some ID / Handle ?

We were only interested in the events rate and timing but indeed that could be
useful. I'll add that using the parser friendly syntax suggested above.

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