From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757466AbYEOCmj (ORCPT ); Wed, 14 May 2008 22:42:39 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752774AbYEOCma (ORCPT ); Wed, 14 May 2008 22:42:30 -0400 Received: from pentafluge.infradead.org ([213.146.154.40]:35415 "EHLO pentafluge.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751513AbYEOCm3 (ORCPT ); Wed, 14 May 2008 22:42:29 -0400 Date: Wed, 14 May 2008 19:41:41 -0700 From: Greg KH To: Markus Rechberger Cc: mchehab@infradead.org, v4l-dvb-maintainer@linuxtv.org, video4linux-list@redhat.com, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, dean@sensoray.com Subject: Re: [v4l-dvb-maintainer] [PATCH] USB: add Sensoray 2255 v4l driver Message-ID: <20080515024141.GB21941@kroah.com> References: <20080514205927.GA13134@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.16 (2007-06-09) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, May 15, 2008 at 03:17:42AM +0200, Markus Rechberger wrote: > Hi Dean, Greg, Adding dean to the cc: line... :) > > On 5/14/08, Greg KH wrote: > > From: Dean Anderson > > > Why do you do those conversions in kernelspace? > ffmpeg/libswscale has optimized code for colourspace conversions. > I know a few drivers do that in kernelspace but it's way more flexible > in userspace and depending on the optimization requires less CPU > power. I thought they were there as needed by some V4L1 applications, but that code was recently removed by Dean I think. If they don't need to be there, and userspace apps can properly handle the different colorspace, then I'll be glad to remove them. thanks, greg k-h