linux-kernel - Re: [v4l-dvb-maintainer] [PATCH] USB: add Sensoray 2255 v4l driver

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Message-ID: <20080515024141.GB21941@kroah.com>
Date:	Wed, 14 May 2008 19:41:41 -0700
From:	Greg KH <greg@...ah.com>
To:	Markus Rechberger <mrechberger@...il.com>
Cc:	mchehab@...radead.org, v4l-dvb-maintainer@...uxtv.org,
	video4linux-list@...hat.com, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, dean@...soray.com
Subject: Re: [v4l-dvb-maintainer] [PATCH] USB: add Sensoray 2255 v4l driver

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 <greg@...ah.com> wrote:
> > From: Dean Anderson <dean@...soray.com>
> >

<big patch snipped>

> 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
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