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IltmmPlay::put_Rate

#include "ltmm.h"

C Syntax	HRESULT IltmmPlay_put_Rate(pPlay, newVal)
C++ Syntax	HRESULT put_Rate(newVal)

 

IltmmPlay *pPlay;	/* pointer to an interface */
double newVal;	/* new playback rate */

Assigns the media playback rate.

Parameter	Description
pPlay	Pointer to an IltmmPlay interface.
newVal	Playback rate. Must not be zero.

Returns

S_OK	The function was successful.
<> S_OK	An error occurred. Refer to the Error Codes or the HRESULT error codes in the DirectShow documentation.

Comments

The playback rate is expressed as a ratio of the normal speed. Thus, 1.0 is normal playback speed, 0.5 is half speed, and 2.0 are twice speed. For audio streams, changing the rate also changes the pitch.

Negative playback rates are supported only for MP4/ISO files. A negative playback rate plays the file backwards but the playback is video-only and only the key frames are displayed.

Required DLLs and Libraries

LTMM For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

Platforms

Win32, x64

See Also

Elements:	IltmmPlay::get_Rate
Topics:	Multimedia Function Group

Example

For a C example, refer to the Simple Media Player for C.

For a C++ example, refer to the Simple Media Player for C++.