[Linux-uvc-devel] Test of the driver on GNU/Debian amd64

[<Oli...@id...>]

Hello,

first, I'm happy to see the support of the new Logitech webcams under
Linux... Even if this is not coming from Logitech itself. (I think it's
an error from Logitech to not making some opensource drivers for their
products, like for example Intel started with their ipw2100/2200 wifi
cards).

My quick first tests are done on a GNU/Debian amd64 system (testing). At
this time, the kernel is linux-image-2.6.13-1-amd64-k8 version 2.6.13-1.

linux-uvc is revision 3 from svn trunk. One remark: the info on the
berlios page http://developer.berlios.de/svn/?group_id=5681 is not
correct for downloading the project. Instead of doing:

  svn checkout svn://svn.berlios.de/linux-uvc/trunk

as described, I have done:

  svn checkout svn://svn.berlios.de/linux-uvc/linux-uvc/trunk

Maybe a small re-organisation of the svn tree will be great ? (to have
directly trunk instead of linux-uvc/trunk). This will help users to
download the tree with the berlios instructions.

Build was ok, with just one warning:

  /home/speech/bornet/devel/work/misc/uvc/trunk/uvcvideo.c:2190:
  warning: initialization from incompatible pointer type

Attached patch uvc_v4l2_read.patch correct this warning.

Installing don't put the module in the right directory, but I think this
is more related to GNU/Debian. (install in /lib/modules/2.6.13/ instead
of /lib/modules/2.6.13-1-amd64-k8/).

Loading the driver seems OK:

  <6>usbcore: registered new driver usbvideo
  <6>USB Video Class driver (v0.1.0)

plugging the cam (a QuickCam fusion):

  <7>usbvideo: Probing device 5
  <7>Format MJPEG found
  <7>Format Uncompressed found
  <7>usbvideo: Found a Status endpoint (addr 87).
  <7>usbvideo: Found UVC device (1.00)
  <7>usbvideo: Scanning UVC chain: OT 5 <- Unit 4 <- Unit 3 <- Unit 2 <- IT 1
  <7>usbvideo: Found a valid video chain (1 -> 5).
  <3>40:3:1: cannot set freq 0 to ep 0x86
  <4>40:3:3: cannot get freq at ep 0x86

Then, I have try to access the camera with camstream, without success:

  CVideoDevice::CVideoDevice() could not query capabilities; is this
  really a video device?

Accessing the camera with OpenCV
(http://sourceforge.net/projects/opencvlibrary/) also cause problems...
I'm now debugging these problems, because I want to use these camera
with OpenCV. I will keep you informed on the progress.

But to be sure that the webcam and driver is starting to work, could you
please give me a pointer to a user program working with it ?

Thanks in advance, and thanks a lot for starting this driver.

        Olivier
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