linux-kernel - Re: [RFC] v4l2 support for thermopile devices

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Message-Id: <20161103142134.4a59dfc34c593391086c0508@kinali.ch>
Date:   Thu, 3 Nov 2016 14:21:34 +0100
From:   Attila Kinali <attila@...ali.ch>
To:     Matt Ranostay <matt@...ostay.consulting>
Cc:     Hans Verkuil <hverkuil@...all.nl>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Marek Vasut <marex@...x.de>, Luca Barbato <lu_zero@...too.org>
Subject: Re: [RFC] v4l2 support for thermopile devices

On Wed, 2 Nov 2016 23:10:41 -0700
Matt Ranostay <matt@...ostay.consulting> wrote:

> 
> So does anyone know of any software that is using V4L2_PIX_FMT_Y12
> currently? Want to test my driver but seems there isn't anything that
> uses that format (ffmpeg, mplayer, etc).
> 
> Raw data seems correct but would like to visualize it :). Suspect I'll
> need to write a test case application though

I was pretty sure that MPlayer supports 12bit greyscale, but I cannot
find where it was handled. You can of course pass it to the MPlayer
internas as 8bit greyscale, which would be IMGFMT_Y8 or just pass
it on as 16bit which would be IMGFMT_Y16_LE (LE = little endian).

You can find the internal #defines of the image formats in
libmpcodecs/img_format.h and can use https://www.fourcc.org/yuv.php
to decode their meaning.

The equivalent for libav would be libavutil/pixfmt.h

Luca Barbato tells me that adding Y12 support to libav would be easy.

			Attila Kinali

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