IWMSyncReader::SetRange method

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The SetRange method enables you to specify a start time and duration for playback by the synchronous reader.

Syntax

HRESULT SetRange(
  QWORD    cnsStartTime,
  LONGLONG cnsDuration
);

Parameters

cnsStartTime

Offset into the file at which to start playback. This value is measured in 100-nanosecond units.

cnsDuration

Duration in 100-nanosecond units, or zero to continue playback to the end of the file.

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
 The cnsDuration parameter is negative.
E_OUTOFMEMORY
 The method is unable to allocate memory for an internal object.
E_UNEXPECTED
 No file is loaded in the synchronous reader.

Remarks

This method specifies a range for the whole file only. You cannot specify a range for an individual stream.

You can call SetRange at any time after a file has been loaded.

The start time you specify might not be the presentation time of the first sample received. The synchronous delivers video samples starting with the key frame before the specified time.

Requirements

   
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)

See also

IWMSyncReader Interface

IWMSyncReader::SetRangeByFrame