[Bug 789809] API: new API to retrieve the device unique ID

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=789809

--- Comment #3 from Philippe Normand <philn at igalia.com> ---
Well, it's true that depending on the OS it's possible to find the ID in
properties. In the current v4l2 device provider a device.serial property is
present, that could be used as unique ID I suppose :)

I'm not sure about other platforms, but I think it would be interesting to
formalize the way devices are identified across all platforms instead of having
each device provider potentially storing the unique identifier in different
properties.

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