IWMReaderAdvanced::SetStreamsSelected method (wmsdkidl.h)

Article
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 It has been superseded by Source Reader and Sink Writer.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 SetStreamsSelected method specifies which streams are selected when manual stream selection is enabled.

Syntax

HRESULT SetStreamsSelected(
  [in] WORD                 cStreamCount,
  [in] WORD                 *pwStreamNumbers,
  [in] WMT_STREAM_SELECTION *pSelections
);

Parameters

[in] cStreamCount

WORD containing the count of stream numbers in the pwStreamNumbers array.

[in] pwStreamNumbers

Pointer to an array containing the stream numbers. Stream numbers are in the range of 1 through 63.

[in] pSelections

Pointer to an array, of equal length to pwStreamNumbers, with each entry containing one member of the WMT_STREAM_SELECTION enumeration type.

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_UNEXPECTED	The method failed for an unspecified reason.

Remarks

This method enables the selected state of multiple streams to be changed simultaneously. Multiple streams can then be turned on or off at the exact time required. For this reason, the parameters of this method and the GetStreamSelected method are not identical.

When selecting streams manually, you should select only one stream at a time from each set of mutually exclusive streams in a file. The SDK does not prevent you from selecting multiple mutually exclusive streams, but the samples for all mutually exclusive streams will be delivered to IWMReaderCallback::OnSample using the same output number. This makes it difficult to differentiate between samples from the various streams.

To deliver samples by stream number, you must receive uncompressed stream samples. You can receive stream samples for a specific stream by calling IWMReaderAdvanced::SetReceiveStreamSamples. You must also implement IWMReaderCallbackAdvanced::OnStreamSample.

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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