linux-kernel - Re: 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)

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Date:   Thu, 16 Mar 2017 10:26:00 +0100
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Nicolas Dufresne <nicolas@...fresne.ca>
Cc:     Philippe De Muyter <phdm@...q.eu>,
        Mauro Carvalho Chehab <mchehab@...pensource.com>,
        Pavel Machek <pavel@....cz>, Hans Verkuil <hverkuil@...all.nl>,
        Sakari Ailus <sakari.ailus@....fi>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Steve Longerbeam <slongerbeam@...il.com>, robh+dt@...nel.org,
        mark.rutland@....com, shawnguo@...nel.org, kernel@...gutronix.de,
        fabio.estevam@....com, mchehab@...nel.org, nick@...anahar.org,
        markus.heiser@...marIT.de,
        laurent.pinchart+renesas@...asonboard.com, bparrot@...com,
        geert@...ux-m68k.org, arnd@...db.de, sudipm.mukherjee@...il.com,
        minghsiu.tsai@...iatek.com, tiffany.lin@...iatek.com,
        jean-christophe.trotin@...com, horms+renesas@...ge.net.au,
        niklas.soderlund+renesas@...natech.se, robert.jarzmik@...e.fr,
        songjun.wu@...rochip.com, andrew-ct.chen@...iatek.com,
        gregkh@...uxfoundation.org, shuah@...nel.org,
        sakari.ailus@...ux.intel.com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-media@...r.kernel.org, devel@...verdev.osuosl.org,
        Steve Longerbeam <steve_longerbeam@...tor.com>,
        Jacek Anaszewski <j.anaszewski@...sung.com>
Subject: Re: 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)

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.

regards
Philipp