Microsoft DirectX 9.0

AudioFX Sample

The AudioFX sample shows how to use DMOs on DirectMusic audiopaths to add effects to sounds, and how to set effect parameters.


Source: (SDK root)\Samples\C++\DirectMusic\AudioFX

Executable: (SDK root)\Samples\C++\DirectMusic\Bin

User's Guide

A default sound file is loaded when the application is run. You can load a different one by clicking Open File.

At first, no effects are enabled. Click Play to hear the sound without effects.

Click Stop to stop the buffer. Apply one or more effects by selecting checkboxes in the Enable column. Play the sound again.

To adjust parameters for an effect, select an option button in the Adjust column and change the values in the frame on the right side of the window. This can be done regardless of whether the sound is playing and regardless of whether the effect has been applied yet.

Programming Notes

The application implements a CSoundFXManager class to manage effects. In the CSoundFXManager::Initialize method, it retrieves an IDirectSoundBuffer8 interface from the audiopath. This interface is used to set effects on the buffer in the CSoundFXManager::ActivateFX method. Effect parameters are set in the OnEffectChanged function in response to messages from the interface.

See Also