Date: Sun, 31 Dec 2006 12:21:47 +0100 From: Hans Petter Selasky <hselasky@c2i.net> To: freebsd-multimedia@freebsd.org Cc: Luigi Rizzo <rizzo@icir.org>, multimedia@freebsd.org Subject: Re: pwcbsd extensions for spca-supported cameras Message-ID: <200612311221.50111.hselasky@c2i.net> In-Reply-To: <20061230111525.A9195@xorpc.icir.org> References: <20061230111525.A9195@xorpc.icir.org>
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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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