File Source (Async) Filter

[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

The Async File Source filter opens and reads local files of many different data formats and passes the data to a parser filter.

To download media files from the web through HTTP, use the File Source (URL) filter. To read ASF files, use the WM ASF Reader filter.

Label Value
Filter Interfaces IBaseFilter, IFileSourceFilter
Input Pin Media Types Not applicable
Input Pin Interfaces Not applicable
Output Pin Media Types MEDIATYPE_Stream. The subtype depends on the media format. (MEDIASUBTYPE_NULL if the filter doesn't recognize the format.)
Output Pin Interfaces IAMAsyncReaderTimestampScaling, IAsyncReader, IPin
Filter CLSID CLSID_AsyncReader
Property Page CLSID No property page
Executable quartz.dll
Filter Category CLSID_LegacyAmFilterCategory


DirectShow Filters