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Sets the default source of synchronization.
HRESULT SetDefaultSyncSource(void);
Return Values
Returns an HRESULTvalue that depends on the implementation. HRESULTcan be one of the following standard constants, or other values not listed.
| E_FAIL | Failure. |
| E_POINTER | Null pointer argument. |
| E_INVALIDARG | Invalid argument. |
| E_NOTIMPL | Method isn't supported. |
| S_OK or NOERROR | Success. |
Remarks
This method is used when no clock has been given to the filter graph, and the filter graph manager consequently must find a clock to use as the synchronization source. The filter graph manager first tries all filters, starting with renderers, to see if any filter exports a clock (by providing an IReferenceClockinterface). The filter graph manager will choose the first filter that it finds, providing that filter is connected to an upstream source. If no connected filters are found, the first filter if IReferenceClockis used. Typically, this will be the audio rendering filter. If no filter exports a clock, the filter graph manager uses a system clock.