Hi Laurent, I have been doing some experimentation with the UVC webcam gadget along with the UVC user-space application which you have written.
The UVC webcam gadget works fine with the user space application handling the CONTROL events and providing DATA events. Now, I wish to interface a real v4l2 device, for e.g. VIVI or more particularly a soc_camera based host and subdev pair. Now, I see that I can achieve this by opening the UVC and V4L2 devices and doing MMAP -> REQBUF -> QBUF -> DQBUF calls on both the devices per the UVC control event received. But this will involve copying the video buffer in the user-space application from v4l2 (_CAPTURE) to uvc (_OUTPUT) domains, which will significantly reduce the video capture performance. Is there a better solution to this issue? Maybe doing something like a RNDIS gadget does with the help of u_ether.c like helper routines. But if I remember well it also requires the BRCTL (Bridge Control Utility) in userspace to route data arriving on usb0 to eth0 and vice-versa. Not sure though, if it does copying of a skb buffer from ethernet to usb domain and vice-versa. Any idea is much appreciated. Thanks for your help, Bhupesh -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
