IWMMutualExclusion::GetType method (wmsdkidl.h)

Articolo
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 It has been superseded by Source Reader and Sink Writer.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 GetType method retrieves the GUID of the type of mutual exclusion required.

Syntax

HRESULT GetType(
  [out] GUID *pguidType
);

Parameters

[out] pguidType

Pointer to a GUID that specifies the type of mutual exclusion.

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_POINTER	The pguidType parameter is NULL.

Remarks

The following constants represent the GUIDs supported by this SDK.

Mutual exclusion type identifier	Description
CLSID_WMMUTEX_Bitrate	The mutual exclusion streams differ only in bit rate. On playback, the stream that will best use the available bandwidth is chosen. You must use this type of mutual exclusion for multiple bit rate files.
CLSID_WMMUTEX_Language	The mutual exclusion streams are the same content only in a different language. A common use of this type of mutual exclusion is for dubbing soundtracks into multiple languages.
CLSID_WMMUTEX_Presentation	The mutual exclusion streams are the same video in a different presentation format. The presentation format is usually defined by the aspect ratio of the video frame.
CLSID_WMMUTEX_Unknown	The mutual exclusion streams are of a custom type. This sort of mutual exclusion can contain streams of varying types.

Note If you create a multiple bit rate audio file, you may encounter problems streaming the file from Windows Media Services 4.1. To avoid problems, disable auto indexing with a call to IWMWriterFileSink3::SetAutoIndexing before writing the file.

Requirements

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps only],Windows Media Format 7 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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