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[pwc] Getting compressed image for external decompression

To: Philips Webcam Linux Driver <>
Subject: [pwc] Getting compressed image for external decompression
From: Tim Braun <>
Date: Thu, 12 Jan 2006 17:56:18 +0100
Hi folks,

I need to transmit webcam images over a very low bandwidth connection
(at most 100kbit/s) and therefore want to directly get the compressed
image from the pwc driver, transmit this and decompress it at the remote
end.

Unfortunately, I'm unable to find much documentation, although I'm
pretty sure that I read something about this maybe 2 years ago. Right
now, all I have is a link to a (now outdated?) small program that just
grabs the raw stream:

http://lists.saillard.org/pipermail/pwc/attachments/20050426/c1069c26/pwcgrab.c

and some decompression(?) routines in the 'libpwc'-package on the
webpage. I did not find any further documentation about these programs.

So, I'd like to ask whether anyone has already done remote decompression
and could give me some pointers or (of course even better :) ) code...
In any case, am I going into the right direction if I start playing
around with the code I found?

Also, does anyone know how high the compression factor of the built-in
algorithm is?

thanks in advance for any suggestions!
cheers,
tim

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