[gstreamer-bugs] [Bug 424839] v4l2src cannot select video inputs (channels)

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gst-plugins-good | Ver: 0.10.5




------- Comment #2 from Thomas Bauer  2007-03-31 22:28 UTC -------
I do not agree with that.
Interfaces declare Methods at compile time which can be called by other code
being aware of the exact semantics of the interface. Properties on the other
hand are resolved during run time through a generic api which can be accessed
by 'dumb' code (like the gst_parse_launch() method, the gst_launch command or
gst-editor). So it is left up to the user to know about the properties (which
he could enumerate using introspection techniques e.g. gst_inspect or using a
gui like gst-editor). So properties exist on another abstraction layer than the
interface paradigm and thus cannot be implemented within it without breaking
the model and therefore this functionality must be defined in the class
implementing the interface (although it should be possible to define some kind
of higher level interface model... but this is worth a discussion for its
own...)


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