[Bug 746080] v4l2: enumerate output ports and add a property to select input/output

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=746080

--- Comment #4 from Aurélien Zanelli <aurelien.zanelli at parrot.com> ---
(In reply to Nicolas Dufresne (stormer) from comment #3)
> That's nice, we might want to start using properties and simply remove the
> old / unused tuner interface. This would be a lot more useful if there was a
> property to get the list of ports (called channels in this case). Do you

And tuner interface is quite confusing now since v4l2 is no more about tuner
only.
The property to get a lst of channels could be a good idea, what type of
structure do you think we should use ? (I'm not really familiar with good
practice with boxed properties)

> know if this list may change dynamicilly ? Also, to swith input/output, do
> one need to stop streaming and renegotiate the format ?
According to the spec, it is related to physical connectors so I think it can't
change dynamically, but we may ask for confirmation in LinuxMedia ML. 

Also if the the user want to change input/output, I think it should stop
streaming, and renegotiate format:
"Because of these possible side effects applications must select an input
before querying or negotiating any other parameters."
(http://linuxtv.org/downloads/v4l-dvb-apis/vidioc-g-input.html)

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