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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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