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CTransformFilter.CheckInputType method

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[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 CheckInputType method checks whether a specified media type is acceptable for input.

Syntax

virtual HRESULT CheckInputType(
   const CMediaType *mtIn
) = 0;

Parameters

mtIn

Pointer to a CMediaType object that specifies the media type.

Return value

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

Return code Description
S_OK
 Media type is acceptable.
VFW_E_TYPE_NOT_ACCEPTED
 Media type is not acceptable.

Remarks

The derived class must implement this method. Return S_OK if the proposed input format is acceptable, or an error code otherwise.

This method does not need to verify that the input format is compatible with the output format (if any). The input pin verifies that by calling the CheckTransform method.

Requirements

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

See also

CTransformFilter Class