VBI Surface Allocator

The VBI Surface Allocator controls the allocation of VBI buffers in analog television graphs with hardware video port capture scenarios. With devices such as the Bt829 decoder, the frame buffer may contain multiple VBI capture buffers that are accessed via a proprietary hardware-based mechanism known generically as a Video Port. The VBI Surface Allocator filter connects downstream from the capture filter and has no output pin. The filter works closely with the Overlay Mixer (via DirectDraw) to perform coordinated operations on the hardware video port, utilizing the same limited SVGA frame buffer memory.

Filter Interfaces IBaseFilter
Input Pin Media TypesMEDIATYPE_Video, MEDIASUBTYPE_VPVBI
Input Pin Interfaces IKsPropertySet
Output Pin Media TypesMEDIATYPE_NULL, MEDIASUBTYPE_NULL. (Nothing is ever connected to the output pin.)
Output Pin InterfacesNot applicable.
Filter CLSIDCLSID_VBISurfaces
Property Page CLSIDNo property page.
Executablevbisurf.ax
Merit MERIT_NORMAL
Filter Category CLSID_LegacyAmFilterCategory

 

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DirectShow Filters

 

 

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