CSourcePosition class
[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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.]
CSourcePosition is an abstract class for implementing the IMediaPosition interface on a source filter.
This class is obsolete. If your source filter is seekable, it should expose the IMediaSeeking interface instead of IMediaPosition. You can use the CSourceSeeking base class for this purpose.
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