IReferenceClock Interface

This interface represents a system reference clock to be implemented by a filter in the filter graph and used by other filters.

When to Implement

Implement this interface if you are writing a filter that generates a system reference clock. Typically, this applies to audio renderer filters because audio sound boards usually contain a reference clock. Use the CBaseReferenceClock class to implement this interface.

When to Use

Use this interface on any filter to obtain reference clock notifications for a duration of elapsed time (both singular and repetitive), or to retrieve the current time.

Methods in Vtable Order

The following table shows the methods that appear in the Vtable beneath the standard COM methods inherited from IUnknown.

Method Description
GetTime Gets the current time.
AdviseTime Requests an asynchronous notification that a duration has elapsed.
AdvisePeriodic Creates a periodic advise request.
Unadvise Cancels a request for notification.


DirectShow applications and DirectShow filters have different include file and link library requirements. See Setting Up the Build Environment for more information.

OS Versions: Windows CE 2.12 and later. Version 2.12 requires DXPAK 1.0 or later.

See Also

DirectShow Interfaces

Last updated on Wednesday, April 13, 2005

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