IMediaObject::SetOutputType 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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 SetOutputType method sets the media type on an output stream, or tests whether a media type is acceptable.

Syntax

HRESULT SetOutputType(
       DWORD                dwOutputStreamIndex,
  [in] const DMO_MEDIA_TYPE *pmt,
       DWORD                dwFlags
);

Parameters

dwOutputStreamIndex

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

[in] pmt

Pointer to a DMO_MEDIA_TYPE structure that specifies the media type.

dwFlags

Bitwise combination of zero or more flags from the DMO_SET_TYPE_FLAGS enumeration.

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_ACCEPTED	Media type was not accepted
S_FALSE	Media type is not acceptable
S_OK	Media type was set successfully, or is acceptable

Remarks

Call this method to test, set, or clear the media type on an output stream:

To test the media type without setting it, use the DMO_SET_TYPEF_TEST_ONLY flag. If the media type is not acceptable, the method returns S_FALSE.
To set the media type, set dwFlags to zero. If the media type is not acceptable, the method returns DMO_E_TYPE_NOT_ACCEPTED.
To clear the current media type (if any), use the DMO_SET_TYPEF_CLEAR flag and set pmt to NULL. When the method returns, the stream no longer has a media type. The DMO cannot process samples until the application sets a new media type, unless the stream is optional.

The media types that are currently set on other streams can affect whether the media type is acceptable.

Requirements

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

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