Message-ID: <1489656360.2303.2.camel@pengutronix.de>
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)
From: Philipp Zabel <p.zabel@pengutronix.de>
To: Nicolas Dufresne <nicolas@ndufresne.ca>
Cc: Philippe De Muyter <phdm@macq.eu>,
        Mauro Carvalho Chehab <mchehab@s-opensource.com>,
        Pavel Machek <pavel@ucw.cz>, Hans Verkuil <hverkuil@xs4all.nl>,
        Sakari Ailus <sakari.ailus@iki.fi>,
        Russell King - ARM Linux <linux@armlinux.org.uk>,
        Steve Longerbeam <slongerbeam@gmail.com>, robh+dt@kernel.org,
        mark.rutland@arm.com, shawnguo@kernel.org, kernel@pengutronix.de,
        fabio.estevam@nxp.com, mchehab@kernel.org, nick@shmanahar.org,
        markus.heiser@darmarIT.de, laurent.pinchart+renesas@ideasonboard.com,
        bparrot@ti.com, geert@linux-m68k.org, arnd@arndb.de,
        sudipm.mukherjee@gmail.com, minghsiu.tsai@mediatek.com,
        tiffany.lin@mediatek.com, jean-christophe.trotin@st.com,
        horms+renesas@verge.net.au, niklas.soderlund+renesas@ragnatech.se,
        robert.jarzmik@free.fr, songjun.wu@microchip.com,
        andrew-ct.chen@mediatek.com, gregkh@linuxfoundation.org,
        shuah@kernel.org, sakari.ailus@linux.intel.com,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org,
        devel@driverdev.osuosl.org,
        Steve Longerbeam <steve_longerbeam@mentor.com>,
        Jacek Anaszewski <j.anaszewski@samsung.com>
Date: Thu, 16 Mar 2017 10:26:00 +0100
In-Reply-To: <1489604109.4593.4.camel@ndufresne.ca>
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         <20170313124621.GA10701@valkosipuli.retiisi.org.uk>
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         <e0a6c60b-1735-de0b-21f4-d8c3f4b3f10f@xs4all.nl>
         <20170314072143.498cde9b@vento.lan> <20170314223254.GA7141@amd>
         <20170314215420.6fc63c67@vento.lan> <20170315105049.GA12099@frolo.macqel>
         <1489604109.4593.4.camel@ndufresne.ca>
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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