CMBufferQueueGetFirstPresentationTimeStamp(_:)

Declaration

func CMBufferQueueGetFirstPresentationTimeStamp(_ queue: CMBufferQueue) -> CMTime

Parameters

• queue:

  CMBufferQueue being interrogated.

Return Value

The presentation timestamp of the first buffer in the interrogated CMBufferQueue.

Discussion

This API is is a faster alternative to CMBufferQueueTestTrigger(_:triggerToken:), but only works if you know your queue is sorted by presentation timestamp. If the getPresentationTimeStamp callback is NULL, kCMTimeInvalid will be returned.

See Also

Inspecting Duration and Timing

• CMBufferQueueGetDuration(_:)
• CMBufferQueueGetMinDecodeTimeStamp(_:)
• CMBufferQueueGetFirstDecodeTimeStamp(_:)
• CMBufferQueueGetMinPresentationTimeStamp(_:)
• CMBufferQueueGetEndPresentationTimeStamp(_:)
• CMBufferQueueGetMaxPresentationTimeStamp(_:)
• CMBufferQueueGetCallbacksForSampleBuffersSortedByOutputPTS()
• CMBufferQueueGetCallbacksForUnsortedSampleBuffers()