linux-kernel - Re: Problems using quickcam

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Date:	Tue, 13 Nov 2007 22:36:01 +0100
From:	Markus Hirschmann <mh@...tro.de>
To:	Thierry Merle <thierry.merle@...e.fr>
Cc:	Mauro Carvalho Chehab <mchehab@...radead.org>,
	jayakumar.video@...il.com, Christian Magnusson <mag@....cx>,
	dtor@...l.ru, linux-kernel@...r.kernel.org
Subject: Re: Problems using quickcam_messenger on ARM (FYI)

Hi Thierry

Thierry Merle wrote:
> Hi Mauro,
> Mauro Carvalho Chehab a écrit :
>> Em Ter, 2007-11-06 às 18:25 +0100, Markus Hirschmann escreveu:
>>   
>>> Hello Kernel-Developer,
>>>
>>> Module quickcam_messenger seems to be broken (tried 2.6.18 and 2.6.22)
>>> on 2 different NSLU2 (ARM). Picture is attached. Same kernel and module 
>>> can be used without any problems on x86 here. I don't have any ARM 
>>> device beside the NSLU2, so I cannot check.
>>>
>>> The solution was to use Christian Magnusson's quickcam module. 
>>> Everything worked without any problem. Webcam is:
>>>     
>> Hmm... you're mentioning the quickcam module, but some of your logs are
>> related to usbvideo driver.
>>
>> On a quick glance, I didn't find anything that could explain your
>> troubles. It seems to be related to a wrong order at the output format
>> (for example, the driver is sending RGB, instead of BGR).
>>
>> It may also be an issue at the userspace application that is using the
>> wrong logic to deal with Big Endian.
>>
>>   
> The NSLU2 is based on a IXP420 processor that can change its endianess.
> I suppose Markus has installed the debian-arm distribution on his NSLU2
> so it is configured as little-endian.
> Nevertheless, I took a look at the code of quickcam messenger that is in
> usbvideo/
> This macro: RGB24_PUTPIXEL puts in memory the following bytes:
>                 *pf++ = (vb);
>                 *pf++ = (vg);
>                 *pf++ = (vr);
> vb, vg, vr are blue, green, red values.
> Since the driver is still v4l1 this can be normal(?)

Right, I forgot. Installed is the Debian ARM distribution. And I tried 
serveral different applications (motion, vgrabbj).

Best regards

Markus
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