Classes > EffectsMan class > Methods > Effects.PlaybackRateApply method

Remarks

Applies a Playback Rate change to the given portion of sound under editing. A change to the playback rate will cause a change to both sound tempo and pitch, as if an LP disc was played at wrong RPM rate. The use of this method will speed up/down the sound playback, the sound duration will be altered and voices will result altered also; if you don't want to alter voices, use the Effects.TempoApply method.

During the execution of the editing session the CallbackEditPerc delegate is invoked in order to notify about the percentage of advancement.

For further details about callback delegates see the How to synchronize the container application with the API tutorial.

For further details about methods related to the use of special effects refer to the EffectsMan class.

Syntax

[Visual Basic]

Public Function PlaybackRateApply (

nStartPosition as Int32,

nEndPosition as Int32,

fPlaybackRatePerc as Single

) as enumErrorCodes

[C#]

public enumErrorCodes PlaybackRateApply (

Int32 nStartPosition,

Int32 nEndPosition,

float fPlaybackRatePerc

);

[C++]

public: enumErrorCodes PlaybackRateApply (

Int32 nStartPosition,

Int32 nEndPosition,

float fPlaybackRatePerc

);

Parameter	Description

nStartPosition	Start position, expressed in milliseconds, of the affected sound range.
nEndPosition	End position, expressed in milliseconds, of the affected sound range.. If set to -1 the end position will be set to the end of the sound.
fPlaybackRatePerc	Playback Rate increment/decrement expressed in percentage. Supported values are from -90 to 90.

Return value

Value	Meaning

Negative value	An error occurred (see the LastError property for further error details)
enumErrorCodes.ERR_NOERROR (0)	The method call was successful.