Userspace Camera Drivers
From: Adrian Cox (adrian_at_humboldt.co.uk)
Date: 08/31/04
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To: Linux Kernel Mailing List <linux-kernel@vger.kernel.org> Date: Tue, 31 Aug 2004 11:09:46 +0100
The pwcx debate has made me wonder why USB camera drivers are in the
kernel. I can think of two reasons:
1) libusb doesn't support isochronous transactions.
2) V4L is the only generally accepted video capture API.
IEEE1394 cameras took a different path:
1) An isochronous transaction manager for kernel space -
http://www.linux1394.org/video1394.php
2) A userspace library to access the cameras -
http://sourceforge.net/projects/libdc1394/
Problem 1 may be fixed by Mac Cody's code, though I've not tried this
myself yet:
http://sourceforge.net/mailarchive/message.php?msg_id=8816704
Is there an existing library that would handle problem 2? Gstreamer
might do it, but the documentation is much more oriented to media
playback than machine vision.
- Adrian Cox
Humboldt Solutions Ltd.
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