linux-kernel - Re: [PATCH v5 00/39] i.MX Media Driver

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Message-ID: <20170319095558.GP21222@n2100.armlinux.org.uk>
Date:   Sun, 19 Mar 2017 09:55:58 +0000
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Nicolas Dufresne <nicolas@...fresne.ca>
Cc:     Steve Longerbeam <steve_longerbeam@...tor.com>,
        Steve Longerbeam <slongerbeam@...il.com>, robh+dt@...nel.org,
        mark.rutland@....com, shawnguo@...nel.org, kernel@...gutronix.de,
        fabio.estevam@....com, mchehab@...nel.org, hverkuil@...all.nl,
        nick@...anahar.org, markus.heiser@...marIT.de,
        p.zabel@...gutronix.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, pavel@....cz,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        devel@...verdev.osuosl.org
Subject: Re: [PATCH v5 00/39] i.MX Media Driver

On Sat, Mar 18, 2017 at 08:41:14PM -0400, Nicolas Dufresne wrote:
> Along with the norm fallback, GStreamer could could also consider the
> currently set framerate as returned by VIDIOC_G_PARM. At the same time,
> implementing that enumeration shall be straightforward, and will make a
> large amount of existing userspace work.

Since, according to v4l2-compliance, providing the enumeration ioctls
appears to be optional:

1) should v4l2-compliance be checking whether other frame sizes/frame
   intervals are possible, and failing if the enumeration ioctls are
   not supported?

2) would it also make sense to allow gstreamer's v4l2src to try setting
   a these parameters, and only fail if it's unable to set it?  IOW, if
   I use:

gst-launch-1.0 v4l2src device=/dev/video10 ! \
	video/x-bayer,format=RGGB,framerate=20/1 ! ...

   where G_PARM says its currently configured for 25fps, but a S_PARM
   with 20fps would actually succeed.

-- 
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