IVPConfig::IsVPDecimationAllowed method (vpconfig.h)
[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 IsVPDecimationAllowed method, given the context, retrieves whether scaling at the video port is possible.
Syntax
HRESULT IsVPDecimationAllowed(
[out] LPBOOL pbIsDecimationAllowed
);
Parameters
[out] pbIsDecimationAllowed
Receives a Boolean value indicating whether decimation is possible.
Return value
Returns an HRESULT value.
Remarks
The Overlay Mixer filter uses this function to determine whether the driver needs the mixer to decimate video data at its own discretion. This function can be especially useful in a capture with preview situation in which you would not want the VP mixer filter to perform any scaling at the video port.
Include Dvp.h and Vptype.h before Vpconfig.h.
Requirements
| Minimum supported client | Windows 2000 Professional [desktop apps only] |
| Minimum supported server | Windows 2000 Server [desktop apps only] |
| Target Platform | Windows |
| Header | vpconfig.h |
| Library | Strmiids.lib |