Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759790AbcKDFMy (ORCPT ); Fri, 4 Nov 2016 01:12:54 -0400 Received: from mail-qk0-f172.google.com ([209.85.220.172]:32870 "EHLO mail-qk0-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933932AbcKDFLh (ORCPT ); Fri, 4 Nov 2016 01:11:37 -0400 MIME-Version: 1.0 X-Originating-IP: [73.25.156.150] In-Reply-To: <0e410f78-840b-842a-c9ab-bc0ffc159249@gentoo.org> References: <767cacf5-5f91-2596-90ef-31358b8e1db9@xs4all.nl> <20161103142134.4a59dfc34c593391086c0508@kinali.ch> <0e410f78-840b-842a-c9ab-bc0ffc159249@gentoo.org> From: Matt Ranostay Date: Thu, 3 Nov 2016 22:11:36 -0700 Message-ID: Subject: Re: [RFC] v4l2 support for thermopile devices To: Luca Barbato Cc: Attila Kinali , Hans Verkuil , Linux Media Mailing List , Linux Kernel , Jonathan Cameron , Lars-Peter Clausen , Marek Vasut Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1717 Lines: 47 On Thu, Nov 3, 2016 at 8:11 AM, Luca Barbato wrote: > On 03/11/2016 14:21, Attila Kinali wrote: >> On Wed, 2 Nov 2016 23:10:41 -0700 >> Matt Ranostay 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. 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 -> http://imgur.com/a/8totG > > [1]:https://github.com/lu-zero/libav/commits/gray12 > > lu