CTransInPlaceOutputPin.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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 *pmt
);

Parameters

pmt

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

Return value

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

Remarks

This method overrides the CTransformOutputPin::CheckMediaType method.

If the filter is already streaming and is using two allocators, this method rejects any format changes. Otherwise, this method calls the filter's CTransformFilter::CheckInputType method to check the media type. If the input pin is connected, it also calls the IPin::QueryAccept method on the upstream output pin.

Requirements

See also

CTransInPlaceOutputPin Class