Function

CVDisplayLinkGetCurrentTime(_:_:)

Retrieves the current (“now”) time of a given display link.

Declaration

func CVDisplayLinkGetCurrentTime(_ displayLink: CVDisplayLink, _ outTime: UnsafeMutablePointer<CVTimeStamp>) -> CVReturn

Parameters

displayLink

The display link whose current time you want to obtain.

outTime

A pointer to a CVTimeStamp structure. Note that you must set the version in the structure (currently 0) before calling to indicate which version of the timestamp structure you want.

Return Value

A Core Video result code. See Core Video Constants for possible values.

Discussion

You use this call to obtain the timestamp of the frame that is currently being displayed.

See Also

Inspecting Display Links

func CVDisplayLinkGetCurrentCGDisplay(CVDisplayLink) -> CGDirectDisplayID

Gets the current display associated with a display link.

func CVDisplayLinkTranslateTime(CVDisplayLink, UnsafePointer<CVTimeStamp>, UnsafeMutablePointer<CVTimeStamp>) -> CVReturn

Translates the time in the display link’s time base from one representation to another.

func CVDisplayLinkGetActualOutputVideoRefreshPeriod(CVDisplayLink) -> Double

Retrieves the actual output refresh period of a display as measured by the system time.

func CVDisplayLinkGetNominalOutputVideoRefreshPeriod(CVDisplayLink) -> CVTime

Retrieves the nominal refresh period of a display link.

func CVDisplayLinkGetOutputVideoLatency(CVDisplayLink) -> CVTime

Retrieves the nominal latency of a display link.

func CVDisplayLinkIsRunning(CVDisplayLink) -> Bool

Indicates whether a given display link is running.

func CVDisplayLinkGetTypeID() -> CFTypeID

Obtains the Core Foundation ID for the display link data type.