// usbcamdi.h

PCAM_FREE_BW_ROUTINE_EX PcamFreeBwRoutineEx;

NTSTATUS PcamFreeBwRoutineEx(
  PDEVICE_OBJECT BusDeviceObject,
  PVOID DeviceContext,
  ULONG STreamNumber
)
{...}
View the official Windows Driver Kit DDI reference

NtDoc

No description available.

Edit description on GitHub

Windows Driver Kit DDI reference (nc-usbcamdi-pcam_free_bw_routine_ex)

Description

A camera minidriver's CamFreeBandwidthEx callback function selects an alternate setting within the USB video streaming interface that uses no bandwidth.

Parameters

`BusDeviceObject`

Pointer to the camera minidriver's device object created by the USB hub.

`DeviceContext`

Pointer to the camera minidriver's device context.

`STreamNumber`

Indicates stream number.

Return value

CamFreeBandwidthEx returns STATUS_SUCCESS or an appropriate error code.

Remarks

USBCAMD calls the camera minidriver's CamFreeBandwidthEx callback function after the isochronous video stream has stopped.

Typically, this function calls the USBCAMD_SelectAlternateInterface service to select the correct alternate interface and prepare for streaming video.

The original USBCAMD does not call CamFreeBandwidthEx.

This function is required.

PCAM_FREE_BW_ROUTINE_EX - NtDoc