REFERENCE_TIME

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[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

The REFERENCE_TIME data type defines the units for reference times in DirectShow. Each unit of reference time is 100 nanoseconds.

typedef LONGLONG REFERENCE_TIME;

Remarks

The REFERENCE_TIME data type is a 64-bit integer.

Reference times are usually measured from one of the following baselines:

  • An absolute clock time. In this case, the baseline will depend on the implementation of the clock. For more information, see Reference Clocks.
  • Relative to the start of playback.

For more information about reference times, see Time and Clocks in DirectShow.

Requirements

Requirement Value
Header
Strmif.h (include Dshow.h)

See also

DirectShow Data Types