Date: Thu, 16 Mar 2017 10:47:29 +0100
From: Philippe De Muyter <phdm@macq.eu>
To: Philipp Zabel <p.zabel@pengutronix.de>
Cc: Nicolas Dufresne <nicolas@ndufresne.ca>,
        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>
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)
Message-ID: <20170316094729.GA5595@frolo.macqel>
References: <20170311082549.576531d0@vento.lan> <20170313124621.GA10701@valkosipuli.retiisi.org.uk> <20170314004533.3b3cd44b@vento.lan> <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> <1489656360.2303.2.camel@pengutronix.de>
MIME-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
In-Reply-To: <1489656360.2303.2.camel@pengutronix.de>
User-Agent: Mutt/1.5.16 (2007-06-09)
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1244
Lines: 31

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

-- 
Philippe De Muyter +32 2 6101532 Macq SA rue de l'Aeronef 2 B-1140 Bruxelles