PCAM_START_CAPTURE_ROUTINE_EX callback function (usbcamdi.h)

A camera minidriver's CamStartCaptureEx callback function selects the appropriate alternate setting within the USB video streaming interface and prepares the device to stream.

Syntax

PCAM_START_CAPTURE_ROUTINE_EX PcamStartCaptureRoutineEx;

NTSTATUS PcamStartCaptureRoutineEx(
  PDEVICE_OBJECT BusDeviceObject,
  PVOID DeviceContext,
  ULONG StreamNumber
)
{...}

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 the stream number.

Return value

CamStartCaptureEx returns STATUS_SUCCESS or an appropriate error code. This return value is the completion code for the read IRP.

Remarks

The original USBCAMD does not call CamStartCaptureEx.

This function is required.

Requirements