CTransformOutputPin.CheckMediaType 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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 CheckMediaType method determines if the pin accepts a specific media type.

Syntax

HRESULT CheckMediaType(
   const CMediaType *mtIn
);

Parameters

mtIn

Pointer to a CMediaType object that contains the proposed media type.

Return value

Returns an HRESULT value. Possible values include the following.

Return code	Description
S_OK	Success.
E_INVALIDARG	The filter's input pin is not connected.

Remarks

This method implements the pure virtual CBasePin::CheckMediaType method. The method fails if the filter's input pin is not connected. Otherwise, it calls the filter's CTransformFilter::CheckTransform method, which is also pure virtual. The filter's derived class must implement CheckTransform, which determines if the proposed output media type is compatible with the input media type.

Requirements

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