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WST Decoder Filter

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[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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.]

This component has been removed from Windows Vista and later operating systems. It is available for use in the Windows XP and Windows Server 2003 operating systems.

Note

Starting in Windows Vista, DirectShow does not provide a filter to decode World Standard Teletext (WST).

 

The WST Decoder is a kernel-mode filter that accepts decoded World Standard Teletext data from the WST Codec and delivers the bitmaps to Pin 2 on the Overlay Mixer using fonts supplied by Microsoft. Only Western European languages are supported at this time; no Unicode fonts are currently provided.

This filter can be added to the graph automatically by calling ICaptureGraphBuilder2::RenderStream, using the output pin of the WST Codec.

Label Value
Filter Interfaces ISpecifyPropertyPages, IAMWstDecoder
Input Pin Media Types MEDIATYPE_VBI, MEDIASUBTYPE_TELETEXT
Input Pin Interfaces IPin
Output Pin Media Types MEDIATYPE_Video
Output Pin Interfaces IPin
Filter CLSID CLSID_WSTDecoder
Property Page CLSID CLSID_WstDecoderPropertyPage
Executable Wstdecod.DLL
Merit MERIT_NORMAL
Filter Category CLSID_LegacyAmFilterCategory

 

DirectShow Filters

Viewing World Standard Teletext