Function

CVDisplayLinkTranslateTime(_:_:_:)

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

Declaration

func CVDisplayLinkTranslateTime(_ displayLink: CVDisplayLink, _ inTime: UnsafePointer<CVTimeStamp>, _ outTime: UnsafeMutablePointer<CVTimeStamp>) -> CVReturn

Parameters

displayLink

The display link whose time base should be used to do the translation.

inTime

A pointer to a CVTimeStamp structure containing the source time to translate.

outTime

A pointer to a CVTimeStamp structure into which the target time is written. Before calling, you must set the version field (currently 0) to indicate which version of the structure you want. You should also set the flags field to specify which representations to translate to.

Return Value

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

Discussion

Note that the display link has to be running for this call to succeed.

See Also

Inspecting Display Links

func CVDisplayLinkGetCurrentCGDisplay(CVDisplayLink) -> CGDirectDisplayID

Gets the current display associated with a display link.

func CVDisplayLinkGetCurrentTime(CVDisplayLink, UnsafeMutablePointer<CVTimeStamp>) -> CVReturn

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

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.