IWMDRMReader2::GetPlayOutputLevels method (wmsdkidl.h)

Artigo
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 It has been superseded by Source Reader and Sink Writer.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.]

[GetPlayOutputLevels is available for use in the operating systems specified in the Requirements section. It may be altered or unavailable in subsequent versions. Instead, use Microsoft PlayReady. ]

The GetPlayOutputLevels method retrieves the output protection levels (OPLs) that apply to the play action in the license of the file loaded in the reader.

Syntax

HRESULT GetPlayOutputLevels(
  [out]     DRM_PLAY_OPL *pPlayOPL,
  [in, out] DWORD        *pcbLength,
  [out]     DWORD        *pdwMinAppComplianceLevel
);

Parameters

[out] pPlayOPL

Address of a DRM_PLAY_OPL structure that receives the output levels that apply to playing content. Additional data is appended to the structure. If you pass NULL, the method returns the size of the structure in pcbLength.

[in, out] pcbLength

Address of a variable that contains the size of the DRM_PLAY_OPL structure in bytes. On input set to the size of the allocated buffer. On return the method sets this value to the size of the structure and any appended data.

[out] pdwMinAppComplianceLevel

Address of a variable that receives the minimum application compliance level.

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.

Remarks

When reading DRM-protected content, you must verify that the destination of the protected content is allowed by the license. Calling this method enables you to check the output protection level required by the license.

Before you call this method, you must call SetEvaluateOutputLevelLicenses to configure the reader to evaluate licenses that contain output protection levels.

If the OPL information returned by this method indicates that you cannot play the content using the desired technology, you can call TryNextLicense to find out whether there is another license on the computer that you can use.

Requirements

Requirement	Value
Minimum supported client	Windows XP [desktop apps only],Windows Media Format 9.5 SDK
Minimum supported server	Windows Server 2003 [desktop apps only]
Target Platform	Windows
Header	wmsdkidl.h (include Wmsdk.h)
Library	WMStubDRM.lib

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