IMediaFilter interface (strmif.h)

The IMediaFilter interface controls the streaming state of a filter.

All DirectShow filters implement this interface. It provides methods for switching the filter between states (stopped, paused, and running); for retrieving the filter's current state; and for setting a reference clock. Applications should not call IMediaFilter methods on filters.

The Filter Graph Manager also exposes this interface. Applications can use the SetSyncSource method to set the graph reference clock, and GetSyncSource to retrieve the clock. Applications should not call the other methods on this interface. Instead, use the corresponding methods on the IMediaControl interface.

The IBaseFilter interface inherits from IMediaFilter.


The IMediaFilter interface inherits from IPersist. IMediaFilter also has these types of members:


The IMediaFilter interface has these methods.


The GetState method retrieves the filter's state (running, stopped, or paused).

The GetSyncSource method retrieves the current reference clock.

The Pause method pauses the filter.

The Run method runs the filter.

The SetSyncSource method sets the reference clock.

The Stop method stops the filter.


Minimum supported client Windows 2000 Professional [desktop apps only]
Minimum supported server Windows 2000 Server [desktop apps only]
Target Platform Windows
Header strmif.h (include Dshow.h)