IWMSyncReader::GetMaxOutputSampleSize 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 It has been superseded by Source Reader and Sink Writer.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 GetMaxOutputSampleSize method retrieves the maximum sample size for a specified output of the file open in the synchronous reader.

Syntax

HRESULT GetMaxOutputSampleSize(
  [in]  DWORD dwOutput,
  [out] DWORD *pcbMax
);

Parameters

[in] dwOutput

DWORD containing the output number for which you want to retrieve the maximum sample size.

[out] pcbMax

Pointer to a DWORD value that receives the maximum sample size, in bytes, for the output specified in dwOutput.

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	pcbMax is NULL. OR dwOutput specifies an invalid output number.
ASF_E_INVALIDSTATE	No file is opened in the synchronous reader.
NS_E_NOT_CONFIGURED	The specified output is not currently configured for playback.
E_UNEXPECTED	The synchronous reader failed to initialize an internal object.

Remarks

In some scenarios, such as multiple bit rate streaming, the output encompasses several streams. The size returned is the maximum sample size for all of the streams associated with the specified output.

You can retrieve the maximum sample size for a specific stream by using IWMSyncReader::GetMaxStreamSampleSize.

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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