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The IReferenceClockinterface 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 CBaseReferenceClockclass 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
| IUnknown methods | Description |
|---|---|
| QueryInterface | Returns pointers to supported interfaces. |
| AddRef | Increments the reference count. |
| Release | Decrements the reference count. |
| IReferenceClock methods | Description |
| GetTime | Gets the current time. |
| AdviseTime | Requests an asynchronous notification that a duration has elapsed. |
| Unadvise | Cancels a request for notification. |