Hi Laurent,
Laurent Pinchart wrote: >> i've spent some time on the Microsoft Xbox Live Vision cam (it's pretty >> cheap, USB 2.0, nearly uvc 1.0 compliant, has a pretty good image >> quality, manual focus, allegedly a 1280x960 sensor (i haven't checked, >> it might just upscale, but i don't think so), and supports MJPG and YUYV). > *nearly* UVC compliant ? *sigh*... Can't they test their hardware with > Linux ? :-) *g* Well, given that the thing is designed for a gaming console, I consider it as an advancement already that it a.) doesn't have a proprietary connector, and b.) at least tries to follow SOME standard, and c.) doesn't try to put all the magic into the host. > SET_INTERFACE shouldn't be required. Upon being plugged in, the webcam should > select the default alternate setting. here is a lsusb -v: http://tmb.elitedvb.net/lsusb_045e0294 What's with that "Xbox Security Method 3" interface? So that's not the default interface? (We can/should totally ignore that interface, it's only an optional authentication between the host and the device. I just want to be sure that this is not the default interface.) >> b.) The cam requires about ~3sec time after the initial SET_INTERFACE. > Now this is bad news. What happens if you query controls during those ~3sec ? > Those the webcam timeout but stay functional, or does it crash ? It stays functional. It just responds with NAKs, and then, after it has initialized itself, it answers (unless, of course, the transaction has been cancelled). > I'll test the SET_INTERFACE part and commit it soon. Regarding the timeouts, > what happens if you modify the streaming timeout only ? I can currently not test it, because the cam is operating at a remote place (and I don't want to risk a crash), but I can this test tomorrow. My guess it that it will work, because the streaming command is done first. I still vote for a dummy transaction after the SET_INTERFACE with a long timeout, to make sure the cam has initialized itself. After that the short timeout should suffice. Just incrementing the timeout is a bad thing, i'd say. Felix _______________________________________________ Linux-uvc-devel mailing list [email protected] https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
