From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751272AbdFFGfr (ORCPT ); Tue, 6 Jun 2017 02:35:47 -0400 Received: from mail-ot0-f175.google.com ([74.125.82.175]:34640 "EHLO mail-ot0-f175.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750755AbdFFGfq (ORCPT ); Tue, 6 Jun 2017 02:35:46 -0400 MIME-Version: 1.0 In-Reply-To: <20170603081817.GQ1019@valkosipuli.retiisi.org.uk> References: <20170603081817.GQ1019@valkosipuli.retiisi.org.uk> From: Ajay kumar Date: Tue, 6 Jun 2017 12:05:44 +0530 Message-ID: Subject: Re: Support for RGB/YUV 10, 12 BPC(bits per color/component) image data formats in kernel To: Sakari Ailus Cc: LKML , linux-media Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Sakari, On Sat, Jun 3, 2017 at 1:48 PM, Sakari Ailus wrote: > Hi Ajay, > > On Fri, Jun 02, 2017 at 06:38:53PM +0530, Ajay kumar wrote: >> Hi all, >> >> I have tried searching for RGB/YUV 10, 12 BPC formats in videodev2.h, >> media-bus-format.h and drm_fourcc.h >> I could only find RGB 10BPC support in drm_fourcc.h. >> I guess not much support is present for formats with (BPC > 8) in the kernel. > > What's "BPC"? Most YUV and RGB formats have only 8 bits per sample. More > format definitions may be added if there's a driver that makes use of them. BPC : Bits Per Color/Component In my project, we have an image capture device which can capture 10 or 12 bits for each of R, G, B colors, i.e: R[0:9] G[0:9] B[0:9] and R[0:11] G[0:11] B[0:11] I want to define macros for the above formats in videodev2.h. But, I am not getting the logic behind the naming convention used to define v4l2_fourcc macros. ex: V4L2_PIX_FMT_ARGB32 v4l2_fourcc('A', 'R', '2', '4'); How did they choose the characters 'A', 'R', '2', '4' in the above case? I want to know the logic/naming convention behind that, so that I can create new v4l2_fourcc defines for 10, 12 BPC formats and use in my driver. Thanks, Ajay Kumar >> >> Are there any plans to add fourcc defines for such formats? >> Also, I wanted to how to define fourcc code for those formats? > > -- > Regards, > > Sakari Ailus > e-mail: sakari.ailus@iki.fi XMPP: sailus@retiisi.org.uk