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CBaseStreamControl::NotifyFilterState (Windows Embedded CE 6.0)

  • Article

1/6/2010

Notifies the pin of your filter's state.

Syntax

void NotifyFilterState(
  FILTER_STATE new_state,
  REFERENCE_TIME tStart = 0 
);

Parameters

  • new_state
    Filter's new state.
  • tStart
    Time at which streaming starts (only valid when new_state is in State_Running).

Return Value

None.

Remarks

This member function notifies the pin of a filter's new state by setting a FILTER_STATE enumeration type variable.

If you implement your own filter, inform your pin's CBaseStreamControl::NotifyFilterState member function what state your filter is in every time your filter changes state, as shown in the following example.

STDMETHODIMP CMyFilter::Run(REFERENCE_TIME tStart)
{
   //once error check is successful
   m_pMyPin->NotifyFilterState(State_Running, tStart);
   
   //now continue with whatever should occur next, for example...
   return CBaseFilter::Run(tStart);
}
STDMETHODIMP CMyFilter::Pause()
{
   //Once error check is successful
   m_pMyPin->NotifyFilterState(State_Paused, 0);
   
   //Now continue with whatever should occur next, for example...
   return CBaseFilter::Pause();
}
STDMETHODIMP CMyFilter::Stop()
{
   //Once error check is successful
   m_pMyPin->NotifyFilterState(State_Stopped, 0);
   
   //Now continue with whatever should occur next, for example...
   return CBaseFilter::Stop(tStart);
}

Requirements

Windows Embedded CE Windows CE 2.12 and later
Note Microsoft DirectShow applications and DirectShow filters have different include file and Library requirements
For more information, see Setting Up the Build Environment, Version 2.12 requires DXPAK 1.0 or later

See Also

Reference

CBaseStreamControl Class