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Called by the CBaseFilterimplementation when the state changes from stopped to either paused or running.
virtual HRESULT Active(void);
Return Values
Returns an HRESULTvalue. The default implementation returns NOERROR.
Remarks
Any class that requires notification of a change of state should override this member function. This is called when the filter owning the pin exits the State_Stopped state.
Note that the filter graph manager's internal state variable is not updated until after this member function returns, so testing the filter graph manager's state (directly or indirectly) from within this member function should be avoided.