IWMSyncReader::SetOutputProps method (wmsdkidl.h)

Статья
4/26/2023

[The feature associated with this page, Windows Media Format 11 SDK, is a legacy feature. It has been superseded by Source Reader and Sink Writer. Source Reader and Sink Writer have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use Source Reader and Sink Writer instead of Windows Media Format 11 SDK, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

The SetOutputProps method specifies the media properties of an uncompressed output stream.

Syntax

HRESULT SetOutputProps(
  [in] DWORD               dwOutputNum,
  [in] IWMOutputMediaProps *pOutput
);

Parameters

[in] dwOutputNum

DWORD containing the output number.

[in] pOutput

Pointer to an IWMOutputMediaProps interface.

Return value

The method returns an HRESULT. Possible values include, but are not limited to, those in the following table.

Return code	Description
S_OK	The method succeeded.
E_INVALIDARG	The dwOutputNum parameter is greater than or equal to the number of outputs. Output numbers begin with zero.
E_UNEXPECTED	The method failed for an unspecified reason.

Remarks

Manipulating an object retrieved by a call to GetOutputProps has no effect on the output media stream unless the application also calls SetOutputProps.

DirectX VA formats can be returned from GetOutputFormat, but if they are passed in to SetOutputProps, that method will fail because DirectX VA formats cannot be specified in this way. Therefore, your code should either examine the format before passing it to SetOutputProps, or else handle the case of that method failing by attempting the next format enumerated from GetOutputFormat.. For example code showing how to identify a DirectX VA format, see Enabling DirectX Video Acceleration.

You can call SetOutputProps at any time after a file has been loaded into the synchronous reader. You can continue making calls as needed during playback.

New output properties set with this method will take effect with the next call to GetNextSample.

Requirements

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps only],Windows Media Format 9 Series SDK, or later versions of the SDK
Minimum supported server	Windows 2000 Server [desktop apps only]
Target Platform	Windows
Header	wmsdkidl.h (include Wmsdk.h)
Library	Wmvcore.lib; WMStubDRM.lib (if you use DRM)

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