Date: Fri, 22 Mar 1996 13:06:15 -0800 (PST) From: "Tom W. Cutter" <twcutter@mowgli.wr.usgs.gov> To: mmead@Glock.COM (matthew c. mead) Cc: dwhite@resnet.uoregon.edu, henrich@crh.cl.msu.edu, kuku@gilberto.physik.rwth-aachen.de, multimedia@freebsd.org Subject: Re: nv and quickcam Message-ID: <199603222106.NAA01992@mowgli.wr.usgs.gov> In-Reply-To: <199603221934.OAA20096@neon.Glock.COM> from "matthew c. mead" at Mar 22, 96 02:34:37 pm
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> > On Fri, 22 Mar 1996, matthew c. mead wrote: > > I have -current up, but I haven't messed with the in > kernel quickcam driver. I was thinking about trying to do so, > but I don't know if replacement qcam programs etc. exist yet, and > I don't have the time lately... I've been working with the kernel driver using it with vic. I collected Paul Traina's kernel driver source from: ftp://ftp.shockwave.com/pub/users/pst/qcamdriver/ The vic qcam module is a work in progress for me. I've been able to get about 8 fps at 160x120 and about 3 fps at 320x240 with my 486. I've been working from Peter Grehan's grabber-qcam.cc code modifying it to use the kernel driver. What I've got is located via anon-ftp: s101dcascr.wr.usgs.gov in a file pub/grabber-qcam.cc.gz. Adding h.261 encoding and perhaps h.263 encoding is something I've been wanting to do with vic and the grabber module . The h.263 <http://www.nta.no/brukere/DVC/>; encoding would allow video streams at bitrates below 28.8kbit/sec. Problems I had with the driver: 1) The driver was not allocating the buffer memory properly. I was getting a "cannot allocate memory error" when opening the device to read. I modifed the kernels file qcam.c: qs->buffer_end = qs->buffer = malloc(QC_MAXFRAMEBUFSIZE, M_DEVBUF, M_NOWAIT); Changing the M_NOWAIT option of malloc to M_WAITOK. ^^^^^^^^ At Paul's suggestion. 2) I needed to create the device file by doing a mknod qcam0 c 73 0 in the /dev directory after the kernel was made. 3) The auto probe code in the driver could not find the QuickCam. I put the following line in the kernel conf file: device qcam0 at isa? port 0x278 tty flags 1 The flag 1 worked. - Tom Cutter
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