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USB Request Blocks (URBs) - Windows drivers | Microsoft …
https://docs.microsoft.com/en-us/windows-hardware/drivers/usbcon/communicating-with-a-usb-device
To submit an URB, the client driver uses the IOCTL_INTERNAL_USB_SUBMIT_URB request, which is delivered to the device by means of an I/O request packet (IRP) of type IRP_MJ_INTERNAL_DEVICE_CONTROL. After the USB driver stack is done processing the URB, the driver stack uses the Status member of the URB structure to return a USB-specific status …
How to transfer data to USB isochronous endpoints ...
https://docs.microsoft.com/en-us/windows-hardware/drivers/usbcon/transfer-data-to-isochronous-endpoints
A Universal Serial Bus (USB) device can support isochronous endpoints to transfer time-dependent data at a steady rate, such as with audio/video streaming. To transfer data, the client driver issues a request to read or write data to an isochronous endpoint.
USB Request Block (URB) — The Linux Kernel …
https://www.kernel.org/doc/html/latest/driver-api/usb/URB.html
The basic idea of the new driver is message passing, the message itself is called USB Request Block, or URB for short. An URB consists of all relevant information to execute any USB transaction and deliver the data and status back. Execution of an URB is inherently an asynchronous operation, i.e. the usb_submit_urb () call returns immediately ...
USB Request Block (URB) — The Linux Kernel …
https://www.kernel.org/doc/html/v4.13/driver-api/usb/URB.html
URBs are allocated by calling usb_alloc_urb (): struct urb *usb_alloc_urb (int isoframes, int mem_flags) Return value is a pointer to the allocated URB, 0 if allocation failed. The parameter isoframes specifies the number of isochronous transfer frames you want to schedule. For CTRL/BULK/INT, use 0. The mem_flags parameter holds standard memory ...
Capture USB audio
https://groups.google.com/g/usbpcap/c/SIGXbb1QP08
This works well for audio in: The dumped wave file contains the correct audio capture from the USB headset. But the parser finds none URB_FUNCTION_ISOCH_TRANSFER OUT packets containing data. All...
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