Hi, Phil Dibowitz wrote: > Németh Márton wrote: >> Hi, >> >> I am currently working on a project to test video devices (webcams, >> tuners, etc.) which using the V4L2 API ( http://v4l-test.sourceforge.net/ ). >> >> There are a lot of video devices which are connected to the computer >> via USB. If I have a device available I can run the test against it. >> Some problems are exists, for example it is not so easy to create >> an automatic test which unplugs an USB device at a certain test step and >> replugs it later. >> >> If a hardware device is not available the related software driver cannot >> be tested either. >> >> I wonder if a software "USB loopback device" driver already exists, >> similar to the "lo" device in networking. This device would show up >> as a USB hardware device when it is asked to do so from the user >> space. Then the user space "simulator" would receive all USB packets >> which would normally be sent to the USB device and the "simulator" >> could react and send USB packets in the other direction. >> >> Do you know about such a driver? If not, do you think that the USB >> subsystem has a point or an interface where this can be implemented? > > There's a vloopback for v4l devices. It's the only way to use certain > webcams with a lot of linux apps, but it's sadly unmaintained: > > http://www.lavrsen.dk/twiki/bin/view/Motion/VideoFourLinuxLoopbackDevice > > The latest svn does build with the latest kernel though... Thank you for the hint, looks like an interesting project for me. I have to read its documentation to understand how it is working. Regards, Márton Németh -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
