Re: [RFC] v4l2 support for thermopile devices

From: Matt Ranostay
Date: Fri Nov 04 2016 - 01:13:56 EST

On Thu, Nov 3, 2016 at 8:11 AM, Luca Barbato <lu_zero@xxxxxxxxxx> wrote:
> On 03/11/2016 14:21, Attila Kinali wrote:
>> On Wed, 2 Nov 2016 23:10:41 -0700
>> Matt Ranostay <matt@xxxxxxxxxxxxxxxxxxx> 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
>> 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.

Cool. Although needs to be processed since it is signed value, and
because it it is really just 0C based readings with 0.25C steps.. But
will look into that when I get a chance.

Anyway did hack in basic support so v4l2grab so I could test the
sensor, and seems to work well but needs some colorized processing to
be useful of course.

Soldering iron about 1 meter from sensor ->

> [1]:
> lu