IAMTimelineSrc::IsNormalRate method

[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

Note

[Deprecated. This API may be removed from future releases of Windows.]

 

The IsNormalRate method indicates whether the clip will play at the normal playback rate; that is, the playback rate of the original file.

Syntax

HRESULT IsNormalRate(
   BOOL *pVal
);

Parameters

pVal

Receives a Boolean value indicating how the clip will render. If the value is TRUE, the clip will play at the normal rate. Otherwise, it will play faster or slower than normal.

Return value

If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.

Remarks

A clip's playback rate is determined by its media start and stop times, relative to its timeline times:

Playback rate = (Media Stop <entity type="mdash"/> Media Start) / (Timeline Stop <entity type="mdash"/> Timeline Start)

If this ratio is equal to 1, the clip plays at the authored speed. Otherwise, it plays faster or slower. For more information, see Time in DirectShow Editing Services.

Note

The header file Qedit.h is not compatible with Direct3D headers later than version 7.

 

Note

To obtain Qedit.h, download the Microsoft Windows SDK Update for Windows Vista and .NET Framework 3.0. Qedit.h is not available in the Microsoft Windows SDK for Windows 7 and .NET Framework 3.5 Service Pack 1.

 

Requirements

Requirement	Value
Header	Qedit.h
Library	Strmiids.lib

See also

IAMTimelineSrc Interface

Error and Success Codes