Re: In-kernel frame conversion

[Thierry Merle <thierry.merle@xxxxxxx>]

Hello Jean-Francois and Erik,

Jean-Francois Moine a écrit :
> On Thu, 15 May 2008 15:04:45 +0200, "Erik_Andrén" 
> <erik.andren@xxxxxxxxx> wrote:
>> Hi list,
> 
> Hi Erik,
> 
>> I'm one of the developers of the m560x project. (
>> http://sourceforge.net/projects/m560x-driver/ )
>> aiming to provide a driver for the ALi m5602, m5603 chipsets.
> 	[snip]
>> This driver is unfortunately braindead, always sending Bayer-encoded frames
>> at a fixed VGA resolution.
>> Color recovery, resizing and format conversion is all done in software.
>>
>> Currently we do the same in order to make the camera useful as many relevant
>> linux v4l2 applications fail to have user-space routines converting
>> Bayer-frames.
>>
>> Is it possible to get a driver included upstream and still have such
>> kernel-space frame conversion routines or do they have to go in order to get
>> the driver in an acceptable shape?
> 
> I am working on a driver, gspca v2, which does frame conversion in
> user-space. It is based on gspca v1 which handles over 270 USB
> webcams. It is composed of:
> - a main driver with the USB exchanges and the v4l2 interface,
> - kernel modules for the different webcam types (actually 20) and
> - a helper process which does frame conversion (JPEG and Bayer to
>   YUV420, YUYV and RGB24/32).
> 
> I planned to put it under mercurial as soon as most of the webcams
> will be tested (and the code will be purified ;)). Feel free to get
> a tarball from my site (see below) and to tell me if you may enter
> into this scheme.
> 
We have started something that looks like your framework.
Look at http://www.linuxtv.org/v4lwiki/index.php/V4L2UserspaceLibrary
I have a cruel lack of time to continue but the helper daemon is here with some ideas you can pick.
We can discuss on the v4l2-library ML about that: http://www.linuxtv.org/cgi-bin/mailman/listinfo/v4l2-library
An hg repository is here: http://linuxtv.org/hg/~tmerle/v4l2_extension

> Cheers.
> 
Regards,
Thierry

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