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IMediaFilter Interface (Compact 2013)

3/26/2014

Multimedia components that provide time-based data expose the IMediaFilter interface. This interface abstracts an object that processes time-based data streams and represents a multimedia device (possibly implemented in software). It controls the active or running state of the object and the synchronization of this state with other objects in the system.

This interface inherits the IPersist interface.

When to Implement

Methods on this interface should be implemented as part of any filter. This is typically done by using the base class CBaseFilter, which implements IBaseFilter and IMediaFilter.

When to Use

Because the IMediaFilter interface is inherited by the IBaseFilter interface, which adds other necessary methods required to be exported by filters, this interface is not normally used directly by the filter graph manager or other filters. It can, however, be of use to plug-in distributors. For example, the filter graph manager internally exports IMediaFilter; its plug-in distributor exports IMediaControl and calls the IMediaFilter methods to implement its own methods.

Methods in Vtable Order

The following table shows the methods that appear in the Vtable beneath the standard COM methods inherited from IUnknown.

Method

Description

Stop

Informs the filter to transition to the new (stopped) state.

Pause

Informs the filter to transition to the new (paused) state.

Run

Informs the filter to transition to the new (running) state.

GetState

Determines the state of the filter.

SetSyncSource

Identifies the reference clock to which the filter should synchronize activity.

GetSyncSource

Retrieves the current reference clock (or NULL if there is no clock). Passes a time value to synchronize independent streams.

Requirements

Header

dshow.h

Library

Strmiids.lib

See Also

Reference

DirectShow Interfaces