2012/12/23 Makorihi <makor...@gmail.com>: > Hi everyone, > > I want to learn how to pull frame data from a webcam (UVC Spec) via > pyusb so that I can later do it on a standalone system with a host > controller and microcontroller, but I am having issues with this first > step. I've been looking online and trying to figure out how to get > useful data from the webcam, but have only gotten as far as being able > to view descriptors via control messages. I've used a usb sniffer tool > while the webcam was running and saw that after fetching/setting > descriptor data, it reset the isochronous transfer and continued to > pull frames. Since libusb does not support isochronous, is my method > of approach unreasonable? It seems like a bad idea to jump into > hardware when I can't even get the webcam to work with python. >
What OS? AFAIK, libusb 1.0 has full isochronous support on *nix platforms and libusbx has recently added such support through libusbK/libusb-win32. Unfortunately, PyUSB has no support for isochronous transfer yet. Right now I am working on this, there is a 'iso' branch on git which adds support for isochronous transfers. I can write successfully, but I am in trouble to read (not sure if the problem is my Python code or in the test firmware). -- Best Regards, Wander Lairson Costa ------------------------------------------------------------------------------ LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d _______________________________________________ pyusb-users mailing list pyusb-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pyusb-users
