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List: freebsd-multimedia
Subject: Re: pwcbsd extensions for spca-supported cameras
From: Hans Petter Selasky <hselasky () c2i ! net>
Date: 2006-12-31 11:21:47
Message-ID: 200612311221.50111.hselasky () c2i ! net
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On Saturday 30 December 2006 20:15, Luigi Rizzo wrote:
> If someone (kernel programmers) is interested in having a look at
> this code...
>
> It is not yet usable but i am moving forward quite fast,
> hopefully with a bit of help we can manage to have a working driver
> within a few days.
>
> I have been working recently to integrate more cameras into the
> pwcbsd port, namely those supported by the spca (userland)
> application/driver.
>
> I am doing rather good progress, but wouldn't mind a bit
> of review/help if you are interested. Details are at
>
> http://info.iet.unipi.it/~luigi/FreeBSD/usb-cameras.html
>
> basically i can probe the camera and start the usb transfer,
> all left to do now is link the code that detects the start of frame
> into the usb isoc stream, and later to invoke the format converters
> appropriately.
>
> let me know if you have any suggestions on how to proceed with this.
> (the code is basically the pwcbsd and spcaview that we have in
> the ports, with very limited modifications - the license is
> obviously the same as the original, so this is going to remain
> a port).
>
If you want more stable isochronous transfers, and especially High-speed ISOC
transfers, you need to use my new USB API. Please see:
http://www.turbocat.net/~hselasky/usb4bsd
There are examples in "ugen.c" on how to do ISOC transfers, which is basically
the same as in the old system.
More examples on how to use ISOC transfers:
http://www.turbocat.net/~hselasky/isdn4bsd/sources/src/sys/i4b/layer1/ihfc2/i4b_wibusb.h
http://www.turbocat.net/~hselasky/isdn4bsd/sources/src/sys/i4b/layer1/ihfc2/i4b_hfcsusb.h
I found this comment:
/* !!!!!!!!!! IMPORTANT DO NOT SET THIS HIGHER THAN 8 !!!!!!!!!!!!!!!
* !!!!!!!!!! OHCI IS BUGGY IF YOU DO SO !!!!!!!!!!!!!!!*/
#define ISO_FRAMES_PER_DESC 8
Please set ISO_FRAMES_PER_DESC to 50 and hardcode MAX_ISO_BUFS to 2. That will
work on all USB host controllers.
#
# I recommend using the latest sources:
#
svn --username anonsvn --password anonsvn \
checkout svn://svn.turbocat.net/i4b
#
# The following commands will
# install the driver on FreeBSD:
#
cd i4b/trunk/i4b/FreeBSD.usb
make S=../src package
make install
--HPS
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