// usbioctl.h

typedef struct _USB_FRAME_NUMBER_AND_QPC_FOR_TIME_SYNC_INFORMATION {
  HANDLE        TimeTrackingHandle;
  ULONG         InputFrameNumber;
  ULONG         InputMicroFrameNumber;
  LARGE_INTEGER QueryPerformanceCounterAtInputFrameOrMicroFrame;
  LARGE_INTEGER QueryPerformanceCounterFrequency;
  ULONG         PredictedAccuracyInMicroSeconds;
  ULONG         CurrentGenerationID;
  LARGE_INTEGER CurrentQueryPerformanceCounter;
  ULONG         CurrentHardwareFrameNumber;
  ULONG         CurrentHardwareMicroFrameNumber;
  ULONG         CurrentUSBFrameNumber;
} USB_FRAME_NUMBER_AND_QPC_FOR_TIME_SYNC_INFORMATION, *PUSB_FRAME_NUMBER_AND_QPC_FOR_TIME_SYNC_INFORMATION;
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Windows Driver Kit DDI reference (ns-usbioctl-_usb_frame_number_and_qpc_for_time_sync_information)

_USB_FRAME_NUMBER_AND_QPC_FOR_TIME_SYNC_INFORMATION structure

Description

Stores the frame and microframe numbers and the calculated system QPC values. This structure is used in the IOCTL_USB_GET_FRAME_NUMBER_AND_QPC_FOR_TIME_SYNC request.

Members

`TimeTrackingHandle`

The time racking handle received in the previous IOCTL_USB_STOP_TRACKING_FOR_TIME_SYNC request.

`InputFrameNumber`

A 32-bit USB bus frame number.

`InputMicroFrameNumber`

A 3-bit value received from the hardware.

`QueryPerformanceCounterAtInputFrameOrMicroFrame`

A value predicted by the USB driver stack that represents the system QPC value at the beginning of the frame and microframe represented by the InputFrameNumber and InputMicroFrameNumber input values.

`QueryPerformanceCounterFrequency`

The current performance-counter frequency, in counts per second.

`PredictedAccuracyInMicroSeconds`

A value that represents the accuracy of the predicted QPC value in micro seconds.

`CurrentGenerationID`

An identifier for this request of time synchronization.

`CurrentQueryPerformanceCounter`

Current QPC value captured that is synchronized with the bus frame numbers represented by CurrentHardwareFrameNumber, CurrentHardwareMicroFrameNumber and CurrentUSBFrameNumber.

`CurrentHardwareFrameNumber`

A 1-bit value of the current hardware frame number that is directly read from the MFINDEX register.

`CurrentHardwareMicroFrameNumber`

A 3-bit value of the current hardware micro frame number that is directly read from the MFINDEX register.

`CurrentUSBFrameNumber`

A 32-bit USB frame number value returned by _URB_GET_CURRENT_FRAME_NUMBER.

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