AVI Decompressor Filter

The AVI Decompressor filter enables Video Compression Manager (VCM) codecs to join a filter graph. The application does not need to add the filter to the filter graph; it is pulled in automatically by the Filter Graph Manager when needed.

When the Filter Graph Manager is building a graph to render an AVI file, it checks the FOURCC in the file's AVI header to determine whether the video stream is compressed. If it is, the Filter Graph Manager adds the AVI Decompressor, which then searches the registry for an installed decompressor that can handle the file.

Note MPEG decompressors are never implemented as VCM codecs, but only as native DirectShow filters.

On its upstream pin the AVI Decompressor typically connects to the AVI Splitter. On its output pin it typically connects to the Video Renderer or the AVI Mux Filter.

Filter Interfaces	IBaseFilter
Input Pin Media Types	Major type: MEDIATYPE_Video Subtype: Must correspond to the FOURCC code for the compression type. For more information, see FOURCC Codes. Format type: FORMAT_VideoInfo
Input Pin Interfaces	IMemInputPin, IPin, IQualityControl
Output Pin Media Types	MEDIATYPE_Video, MEDIASUBTYPE_NULL, FORMAT_VideoInfo
Output Pin Interfaces	IMediaPosition, IMediaSeeking, IPin, IQualityControl
Filter CLSID	CLSID_AVIDec
Property Page CLSID	No property page.
Executable	quartz.dll
Merit	MERIT_NORMAL
Filter Category	CLSID_LegacyAmFilterCategory

See Also

DirectShow Filters