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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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

Syntax

virtual HRESULT CheckTransform(
   const CMediaType *mtIn,
   const CMediaType *mtOut
) = 0;

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 an HRESULT value. Possible values include those shown in the following table.

Return code	Description
S_OK	The media types are compatible.
VFW_E_TYPE_NOT_ACCEPTED	The media types are not compatible.

Remarks

The derived class must implement this method. Return S_OK if the filter can accept both of the specified media types, or an error code otherwise.

Requirements

Requirement	Value
Header	Transfrm.h (include Streams.h)
Library	Strmbase.lib (retail builds); Strmbasd.lib (debug builds)