IMediaObject::GetOutputCurrentType method (mediaobj.h)

Статья
4/26/2023

[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 GetOutputCurrentType method retrieves the media type that was set for an output stream, if any.

Syntax

HRESULT GetOutputCurrentType(
        DWORD          dwOutputStreamIndex,
  [out] DMO_MEDIA_TYPE *pmt
);

Parameters

dwOutputStreamIndex

Zero-based index of an output stream on the DMO.

[out] pmt

Pointer to a DMO_MEDIA_TYPE structure allocated by the caller. The method fills the structure with the media type.

Return value

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

Return code	Description
DMO_E_INVALIDSTREAMINDEX	Invalid stream index.
DMO_E_TYPE_NOT_SET	Media type was not set.
E_OUTOFMEMORY	Insufficient memory.
S_OK	Success.

Remarks

The caller must set the media type for the stream before calling this method. To set the media type, call the IMediaObject::SetOutputType method.

If the method succeeds, call MoFreeMediaType to free the format block.

Requirements

Requirement	Value
Target Platform	Windows
Header	mediaobj.h (include Dmo.h)
Library	Dmoguids.lib

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