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Adding doppler effects to the audio player in Symbian C++

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Revision as of 13:01, 21 January 2010


Template:KBCS

Article Metadata
Tested with
Devices(s): Nokia N95
Compatibility
Platform(s): S60 3rd Edition
Article
Keywords: CSourceDoppler
Created: (09 Oct 2008)
Last edited: tanjaluodes (21 Jan 2010)


Overview

The S60 platform has several audio enhancement APIs that can be used to modify the audio experience. One of them is the CSourceDoppler API. This API makes the audio source appear to either move towards or away from the listener.

This snippet can be self-signed.

Preconditions

The audio player must be fully constructed before constructing the instance of the API. This can be done with the following lines of code:

 iMdaAudioPlayerUtility =
CMdaAudioPlayerUtility::NewFilePlayerL( aFileName,
*this,
EMdaPriorityNormal,
EMdaPriorityPreferenceTimeAndQuality);

MMP file

The following capabilities and libraries are required:

CAPABILITY NONE

LIBRARY DopplerBase.lib

HEADER SourceDopplerBase.h


Source file

First you need to construct the reverb utility instance:

 iDopplerEffect = CSourceDoppler::NewL( *iMdaAudioPlayerUtility );

To set the doppler effect on, you need to set the doppler effect factor. The factor needs to be between 0 and FactorMax(). After this, you can enable and apply the effect to the player.

  iDopplerEffect->SetFactorL(iDopplerEffect->FactorMax());
 
if(!iDopplerEffect ->IsEnabled())
iDopplerEffect ->EnableL();
 
iDopplerEffect ->ApplyL();

You can also add a 3D effect by using a timer that periodically changes the effect factor of the effect.

To set the source location effect off, just call the following line of code:

 iDopplerEffect->DisableL();


Test application

File:3D AudioEfects.zip

See also

CS001131 - Adding source location effects to the audio player

CS001132 - Adding listener's location effects to the audio player

CS001133 - Adding bass boost to the audio player

CS001134 - Adding stereo widening to the audio player

CS001135 - Adding reverb to the audio player

CS001136 - Adding equalizer to the audio player

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