// video.h

VIDEOPORT_DEPRECATED VIDEOPORT_API VOID VideoPortStartTimer(
  PVOID HwDeviceExtension
);
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Windows Driver Kit DDI reference (nf-video-videoportstarttimer)

VideoPortStartTimer function

Description

The VideoPortStartTimer function enables calls to a miniport driver's HwVidTimer function.

Parameters

`HwDeviceExtension`

Pointer to the miniport driver's device extension. This pointer is the input parameter to the HwVidTimer function.

Return value

None

Remarks

After a miniport driver calls VideoPortStartTimer, its HwVidTimer function is called at approximately one-second intervals until the miniport driver calls VideoPortStopTimer. A miniport driver's HwVidTimer function must not call VideoPortStopTimer.

A miniport driver cannot call VideoPortStartTimer or VideoPortStopTimer if its DriverEntry function set the HwTimer member of the VIDEO_HW_INITIALIZATION_DATA structure to NULL.

VideoPortStartTimer - NtDoc