IWMReaderAdvanced2::StartAtMarker 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 It has been superseded by Source Reader and Sink Writer.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 StartAtMarker method starts the reader from a specified marker.

Syntax

HRESULT StartAtMarker(
  [in] WORD  wMarkerIndex,
  [in] QWORD cnsDuration,
  [in] float fRate,
  [in] void  *pvContext
);

Parameters

[in] wMarkerIndex

WORD containing the marker index.

[in] cnsDuration

Specifies the duration, in 100-nanosecond units.

[in] fRate

Floating point number indicating rate. Normal-speed playback is 1.0; higher numbers cause faster playback. Numbers less than zero indicate reverse rate (rewinding). The valid range is 1.0 through 10.0, and -1.0 through -10.0.

[in] pvContext

Generic pointer, for use by the application.

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_OUTOFMEMORY	There is not enough available memory.
NS_E_INVALID_REQUEST	The value for fRate is not within the valid ranges.
E_UNEXPECTED	The method failed for an unspecified reason.

Remarks

This method is very similar to IWMReader::Start. The difference is that this method uses a marker index but IWMReader::Start uses a start time.

Requirements


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)