CTransInPlaceFilter.CheckTransform method
[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 CheckTransform method checks whether an input media type is compatible with an output media type. This method overrides the CTransformFilter::CheckTransform method.
Syntax
HRESULT CheckTransform(
const CMediaType *mtIn,
const CMediaType *mtOut
);
Parameters
-
mtIn
-
Pointer to a CMediaType object that specifies the input type.
-
mtOut
-
Pointer to a CMediaType object that specifies the output type.
Return value
Returns S_OK.
Remarks
The CTransInPlace filter never calls CheckTransform. Instead, all pin connection use CTransformFilter::CheckInputType to check the media type, with the assumption that the input and output types always match.
Requirements
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