tags 376999 wishlist tags 376999 wontfix thanks On Wed, Jul 05, 2006 at 11:56:40PM -0400, A. Costa wrote: > Package: linux-image-2.6.16-2-686 > Version: 2.6.16-15 > Severity: normal > > > I'm testing this webcam: > > % lsusb | grep -i cam > Bus 001 Device 003: ID 05a9:0518 OmniVision Technologies, Inc. OV518 > WebCam > > ...which the kernel loads a module for, yet can't seem to use: > > % dmesg | tail > drivers/usb/media/ov511.c: USB OV518 video device found > drivers/usb/media/ov511.c: Device revision 1 > drivers/usb/media/ov511.c: Sensor is an OV6630 > drivers/usb/media/ov511.c: Device at usb-0000:00:07.2-2 registered to > minor 0 > usbcore: registered new driver ov511 > drivers/usb/media/ov511.c: v1.64 for Linux 2.5 : ov511 USB Camera Driver > drivers/usb/media/ov511.c: No decompressor available > drivers/usb/media/ov511.c: No decompressor available > drivers/usb/media/ov511.c: No decompressor available > drivers/usb/media/ov511.c: No decompressor available > > A Google search shows at least one other debian user is vexed by this > bug: > > Troubles with Creative Webcam > http://lists.debian.org/debian-user/2005/02/msg01010.html > > There's also another debian package 'ov511-source', but I was unable to > get it to work with 'linux-image-2.6.16-2-686'. > > On the upstream 'ov511' page: > > http://alpha.dyndns.org/ov511/install.html > > ...it says: > > <snip> > Using Compression Support: > > This information is only valid for the stable driver > series (1.xx). With 2.xx drivers, compression is already > built into ov511.o. For more information, please see the > README that comes with the driver. > Compression support will give you better frame rates with > OV511 cameras, and is REQUIRED with OV518 cameras. It > requires lots of CPU power, and reduces the image quality > somewhat, though. If you want/need it, do the following: > > (NOTE: for OV518 cameras, substitute ov518_decomp for > ov511_decomp ) > > 1. Make sure you installed the latest driver using the > above instructions. The driver that comes with kernels > and operating systems by default has no compression > support. > 2. Add the following line to your /etc/modules.conf . > This will load the decompressor after ov511 is loaded, > and unload the decompressor before ov511 is unloaded: > > above ov511 ov511_decomp > > 3. If you want compression enabled by default all of the > time, add the following line to /etc/modules.conf: > > options ov511 compress=1 > > 4. Load ov511.If you didn't make compression the default > in /etc/modules.conf , load it with the compress=1 > option (modprobe ov511 compress=1). If it is already > loaded, remove it first with " rmmod ov511" > 5. When you unload ov511, you must do it with modprobe > (modprobe -r ov511). With rmmod, you will get "ov511: > Device or resource busy", since it doesn't remove > ov511_decomp automatically. > > <snip> > > ...it looks like there should be another module called 'ov511_decomp', > but is currently missing from 'linux-image-2.6.16-2-686'. Maybe this > 'ov511_decomp' module can be added?
The ov511 driver with the compression feature is available in the archive in the ov51x-jpeg-source package, but intentionally not merged into the Linux kernel by it's author: http://www.rastageeks.org/ov51x-jpeg/index.php/Main_Page : | ov51x-jpeg hacked was made because the original driver did not provide | the jpeg decompression and current v4l implementation did not provide | such facilities. | | To be clear, JPEG decompression should be considered 'evil' inside the | kernel, and the normal way is to handle it in userland, so the original | author was right doing what he did. Cheers, Moritz -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
