Re: [Spca50x-devs] Self Introduction: Hans de Goede
- Date: Fri, 28 Mar 2008 23:46:20 +0100
- From: Hans de Goede <j.w.r.degoede@xxxxxx>
- Subject: Re: [Spca50x-devs] Self Introduction: Hans de Goede
Thomas Kaiser wrote:
> As far as I know, heavy data processing like decoding jpeg or decoding
> the compression format of PAC207 is not allowed in kernel space. So, I
> am not sure if you can get this upstream?
Well jpeg / bayer decoding and pac207 decoding are 2 different orders of CPU
heavy, also the pac207 format is very hardware specific since its the kernels
job to abstract hardware, I believe the pac207 decoding belongs in the kernel,
and I will fight for that! I also agree with the v4l devs that jpeg and bayer
decoding does not belong in the kernel, so I guess / hope that the v4l devs
will see things my way.
>> I just recently (today) learned that there is work underway to make a
>> v4l2 version of gspca by Jean-François Moine: http://moinejf.free.fr/
>> ), I hope that we can work together somehow on getting support for all
>> the webcam's supported in gscpa integrated into the mainline kernel
>> with a v4l2 interface.
> It looks like you both a working on the same thing, separated. I think
> yours and Jean-François idea is the right way to go (thumps up). Work
I've already send him a private mail trying to coordinate things.
> As soon as I have time I will start to test.
> PS: I initial started the PAC207 support for gspca. If you have any
> specific question about PAC207, don't hesitate to contact me.
Well, the gspca driver was pretty clear no questions so far. Only the exposure
setting of it is a PITA, I've rewritten your autoexposure code, as one needs to
do both auto exposure and autogain in one closed loop to get a reasonable
picture in changing light circumstances (from full daylight, to at night in a
TL lit room). I've found and implemented this so called "knee" algorithm:
Which works rather nice so far.
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