IMediaSeeking::SetRate
A version of this page is also available for
4/8/2010
This method sets a new playback rate.
Syntax
HRESULT SetRate(
double dRate
);
Parameters
- dRate
[in] The playback rate, which must not be zero.
Return Value
Returns an HRESULT value that depends on the implementation of the interface.
The default DirectShow implementation returns S_OK for success, E_INVALIDARG if the parameter is invalid, or E_NOTIMPL if the method is not implemented.
Remarks
The playback rate dRate is expressed as a ratio of the normal speed. Thus, 1.0 is normal playback speed, 0.5 is half speed, and 2.0 is twice speed. For audio streams, changing the rate also changes the pitch.
Negative values of dRate indicate reverse playback. If the filter supports reverse playback, it should return AM_SEEKING_CanPlayBackwards from IMediaSeeking::GetCapabilities. If a filter does not return AM_SEEKING_CanPlayBackwards, a negative rate will cause SetRate to fail with a return value of E_INVALIDARG.
Requirements
| Windows Embedded CE | Windows CE 2.12 and later |
| Windows Mobile | Pocket PC for Windows Mobile Version 5.0 and later, Smartphone for Windows Mobile Version 5.0 and later |
| Note | Microsoft DirectShow applications and DirectShow filters have different include file and Library requirements For more information, see Setting Up the Build Environment, Version 2.12 requires DXPAK 1.0 or later |