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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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

See also

CTransInPlaceFilter Class