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Re: [pwc] why cann't I change the palette property by V4L on a pwcdriver

To: Philips Webcam Linux Driver <>
Subject: Re: [pwc] why cann't I change the palette property by V4L on a pwcdriver?
From: "" <>
Date: Sun, 21 Aug 2005 17:02:59 +0300
> >From: Sandy McArthur <>
> >The pwc device only supports YUV20. The kernel devs do not want  
> >pallet conversion to take place in the kernel. You need to do that 
> >in  your software.

Is there some general software library which would have the conversion
function ready to be used? 

Also if really from the official kernel distributions the decompression 
function has to be taken off, I think there should be then some pwc.so, 
which would support decompression and all the most usual colorbase conversion
functions.

Maybe even done such a way, that if someone oneself wants to have that
stuff in the kernel, (s)he could just compile the kernel pwc.ko with
some switch (-DINC_USRF) and it would then include the functions from pwc.so
with some clever transparent way to the kernel driver. 

Because there always will be programs which just want to use v4l-device 
and do not understand to use some user base library in the middle. It will be
cumbersome to have to patch and recompile every one of them by some user
which uses pwc-driver.

I don't know, maybe V4L2 has some standardized way to provide
information from the kernel driver to the application that it (the
application) could/should also load some userbase software library to 
increase the functionality of the kernel driver.
(VIDIOC_QUERYCAP.libraries)



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