Logitech webcam can not proxy with AristoChen/usb-proxy

[imatespl]

hi,@xairy, I test the Logitech webcam, that can not proxy with AristoChen/usb-proxy, because the webcam have 4 interface and each interface has multi altsettings, and some altsettings has no endpoints, then I start usb-proxy, when I click windows 11 webcam preview , the windows driver will send set altsetting control packet to webcam, and then usb-proxy willterminate_eps and restart process thread process_eps, then the raw-gadget ioctl enable returnioctl(USB_RAW_IOCTL_EP_ENABLE): Device or resource busy https://github.com/AristoChen/usb-proxy/blob/c681f1238371fae331482f7d300a4652586d0dd3/proxy.cpp#L474-L482 this line cause the issues https://github.com/AristoChen/usb-proxy/blob/c681f1238371fae331482f7d300a4652586d0dd3/proxy.cpp#L267 the log is like this, first not start any thread for this zero endpoint altsetting, then terminate any thing and start thread for altsetting has endpoint when the windows driver send control message change altsetting

Activating 1 endpoints on interface 0
int_in: addr = 3, ep = #4
Creating thread for EP83
Start reading thread for EP83, thread id(1849)
process_eps done
Start writing thread for EP83, thread id(1850)
Activating 0 endpoints on interface 1
process_eps done
Activating 0 endpoints on interface 2
process_eps done
Activating 0 endpoints on interface 3
process_eps done

ep0: transferred 26 bytes (out)
event: control, length: 8
  bRequestType: 0x01 (OUT), bRequest: 0x0b, wValue: 0x000a, wIndex: 0x0001, wLength: 0
  type = USB_TYPE_STANDARD
  req = USB_REQ_SET_INTERFACE
Changing interface/altsetting
Activating 1 endpoints on interface 1
ioctl(USB_RAW_IOCTL_EP_ENABLE): Device or resource busy

I also change the code bypass the zero endpoint altsetting, then first start thread will failed, the issues is same, ioctl(USB_RAW_IOCTL_EP_ENABLE): Device or resource busy

Creating thread for EP83
Start reading thread for EP83, thread id(4029)
process_eps done
Start writing thread for EP83, thread id(4030)
Activating 1 endpoints on interface 1
ioctl(USB_RAW_IOCTL_EP_ENABLE): Device or resource busy

The device is c922 Pro Stream Webcam The windows 11 driver is Logitech 2021/4/27 1.4.40.0 The usb-proxy run on orangepi pc use the driver is musb-hdrc and device is musb-hdrc.4.auto See attachment for details lsusb-output.txt usb-proxy-console-log.txt

[imatespl]

I think this issue may same with https://github.com/AristoChen/usb-proxy/issues/13, I will try it

[imatespl]

I try raw_gadget dev branch and usb-proxy reset branch, there also has the issue

[xairy]

Not sure what exactly fails in your case, but neither usb-proxy nor Raw Gadget have proper support for isochronous transfers, so proxying webcams or other AV devices will not work anyway.

[imatespl]

Thank you very much. I am closing this issue.

[xairy]

FTR, as it turns out, Raw Gadget does somewhat support isochronous transfers; see #23.