Base Classes that Implement Interfaces

The majority of classes in the DirectShow class library implement COM interfaces. The following list shows how the classes can be categorized:

• Filter base classes implement the IBaseFilter interface, and include CBaseFilter and classes derived from it.
• Pin classes implement the IPin interface, and include CBasePin and derived classes.
• Enumerator classes include CEnumPins and CEnumMediaTypes.
• Transport base classes include CMediaSample, CBaseAllocator, CMemAllocator, and their derived classes. These classes share memory between pins, and pass media samples using that shared memory.
• Control and position classes include CBaseFilter, CMediaPosition, CMediaControl, CBaseMediaFilter, CSourceSeeking, and CBaseStreamControl.
• Clock base classes include CBaseReferenceClock and CSystemClock.

This topic contains the following subtopics.

• Filter Base Classes
• Pin Base Classes
• Enumerator Base Classes
• Transport Base Classes
• Media Control and Positioning Classes
• Clock Base Classes

Last updated on Wednesday, April 13, 2005

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