media / v4l2-mc: wishlist for complex cameras (was Re: [PATCH v4 14/36] [media] v4l2-mc: add a function to inherit controls from a pipeline)

Philipp Zabel p.zabel at
Thu Mar 16 02:26:00 PDT 2017

On Wed, 2017-03-15 at 14:55 -0400, Nicolas Dufresne wrote:
> Le mercredi 15 mars 2017 à 11:50 +0100, Philippe De Muyter a écrit :
> > > I would say: camorama, xawtv3, zbar, google talk, skype. If it runs
> > > with those, it will likely run with any other application.
> > > 
> > 
> > I would like to add the 'v4l2src' plugin of gstreamer, and on the
> > imx6 its
> While it would be nice if somehow you would get v4l2src to work (in
> some legacy/emulation mode through libv4l2),

v4l2src works just fine, provided the pipeline is configured manually in
advance via media-ctl.

>  the longer plan is to
> implement smart bin that handle several v4l2src, that can do the
> required interactions so we can expose similar level of controls as
> found in Android Camera HAL3, and maybe even further assuming userspace
> can change the media tree at run-time. We might be a long way from
> there, specially that some of the features depends on how much the
> hardware can do. Just being able to figure-out how to build the MC tree
> dynamically seems really hard when thinking of generic mechanism. Also,
> Request API will be needed.
> I think for this one, we'll need some userspace driver that enable the
> features (not hide them), and that's what I'd be looking for from
> libv4l2 in this regard.


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