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)

Philippe De Muyter
2017-03-16T09:47:29Z

On Thu, Mar 16, 2017 at 10:26:00AM +0100, Philipp Zabel wrote:
> On Wed, 2017-03-15 at 14:55 -0400, Nicolas Dufresne wrote:
> > Le mercredi 15 mars 2017 ? 11:50 +0100, Philippe De Muyter a ?crit :
> > > > 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.

Including choosing the framerate ? Sorry, I have no time these days
to test it myself.

And I cited imxv4l2videosrc for its ability to provide the physical address
of the image buffers for further processing by other (not necessarily next
in gstreamer pipeline, or for all frames) hardware-accelerated plugins likes
the h.264 video encoder. As I am stuck with fsl/nxp kernel and driver on that
matter, I don't know how the interfaces have evolved in current linux kernels.

BR

Philippe

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