VOID VideoPortStartTimer(
| PVOID HwDeviceExtension | |
| ); |
VideoPortStartTimer enables calls to a miniport's HwVidTimer function.
Parameters
HwDeviceExtension
Points to the miniport driver's device extension. This pointer is the input parameter to the HwVidTimer function.
Comments
After a miniport driver calls VideoPortStartTimer, its HwVidTimer function is called periodically at approximate one-second intervals until the driver calls 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.
A miniport's HwVidTimer function can call VideoPortStopTimer. Only another miniport function can re-enable calls to HwVidTimer by calling VideoPortStartTimer again.
See Also
DriverEntry, HwVidTimer, VIDEO_HW_INITIALIZATION_DATA, VideoPortStopTimer