Hi Daniele, On Friday 10 October 2008, Daniele Paganelli wrote: > Dear UVC developers, > I'm trying to program UVC devices using the video4linux2 API. > I have problems understanding the output UVC driver give for a > VIDIOC_QUERYCTRL ioctl. > > Response struct (v4l2_queryctrl): > id: V4L2_CID_EXPOSURE > type: V4L2_CTRL_TYPE_MENU > name: 'Exposure, Auto' > minimum: 0 > maximum: 0 > step: 9 > default_value: 8 > flags: 0 > > The video4linux2 api specification states that, for a Menu type, the > meaning of the queryctrl response given by the driver should be: > > min: 0 > step: 1 > max: N-1 > > where N is the number of menu choices. > > So how should I interpret the UVC response min=0/max=0/step=9???
As a bug somewhere between the device and the console :-) It can be a driver issue or a userspace issue. First of all, please make sure you're using a recent driver version. SVN head or the driver included in the Linux kernel should do. If it still fails please post a code sample I can test. > I got this response for Logitech QuickCam Pro for Notebooks > and Logitech QuickCam Deluxe for Notebooks > > Best regards > and thanks for the great driver ;) You're welcome. Best regards, Laurent Pinchart _______________________________________________ Linux-uvc-devel mailing list [email protected] https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
