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

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Message-ID: <0e410f78-840b-842a-c9ab-bc0ffc159249@gentoo.org>
Date:   Thu, 3 Nov 2016 16:11:52 +0100
From:   Luca Barbato <lu_zero@...too.org>
To:     Attila Kinali <attila@...ali.ch>,
        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>
Subject: Re: [RFC] v4l2 support for thermopile devices

On 03/11/2016 14:21, Attila Kinali wrote:
> 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
> 

So easy that is [done][1], it still needs to be tested/reviewed/polished
though.

[1]:https://github.com/lu-zero/libav/commits/gray12

lu