[gstreamer-bugs] [Bug 396779] Preset interface for elements

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gstreamer (core) | Ver: HEAD CVS




------- Comment #76 from Stefan Kost (gstreamer, gtkdoc dev)  2008-04-18 07:01 UTC -------
Mike, as explained (e.g. comments #52, #57, #61) already is an interface method
and a the patch brings a default. Its is generally useful for effects and
generators (both audio and video) that have lots of parameters. For audio one
would loop a sequence and hit randomize to get some fresh sounds (which one
would tune then and maybe save as a new preset).

If an element stops working after setting a random presets its broken and need
to be fixed. The randomization is done within the paramspec bounds.

Now it clearly does not make any sense for e.g. encoders. those can override it
with a dummy method. But then I can't imagine why one would create a ui where
one can call randomize preset on an encoder.

One alternative would be to have a dummy default (vmethod=NULL) and just
provide the randomization as a exported function, so that elements can select
it 8and we don't have duplicated code).



Marc-Andre: I was looking at several elements, but could not think of any
use-case for min/max.


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