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PCAM_NEW_FRAME_ROUTINE_EX callback function (usbcamdi.h)

  • Article

A camera minidriver's CamNewVideoFrameEx callback function initializes a new video frame context structure.

Syntax

PCAM_NEW_FRAME_ROUTINE_EX PcamNewFrameRoutineEx;

void PcamNewFrameRoutineEx(
  PVOID DeviceContext,
  PVOID FrameContext,
  ULONG StreamNumber,
  PULONG FrameLength
)
{...}

Parameters

DeviceContext

Specifies the minidriver device context.

FrameContext

Specifies the frame context to be initialized.

StreamNumber

Indicates the stream associated with this new frame.

FrameLength

Pointer to the raw frame buffer length. The length is expressed in bytes. The camera minidriver may decrease this value if it does not require a buffer transfer on the USB bus of the specified size. The camera minidriver should not increase this value.

Return value

None

Remarks

USBCAMD calls the camera minidriver's CamNewVideoFrameEx callback function at IRQL = DISPATCH_LEVEL.

The original USBCAMD does not call CamNewVideoFrameEx.

This function is optional.

Requirements

Requirement Value
Target Platform Desktop
Header usbcamdi.h (include Usbcamdi.h)
IRQL DISPATCH_LEVEL (See Remarks section)