|Microsoft DirectX 9.0|
The GetSyncSource method retrieves the reference clock that the filter is using. This method implements the IMediaFilter::GetSyncSource method.
HRESULT GetSyncSource( IReferenceClock **pClock );
Address of a variable that receives a pointer to the clock's IReferenceClock interface.
Returns S_OK or E_POINTER.
If the filter is not using a reference clock, *pClock is set to NULL. When the method returns, if *pClock is non-NULL, the IReferenceClock interface has an outstanding reference count. Be sure to release it when you are done.