Using Effects

DirectX provides support for effects processing of sounds by DirectX Media Objects (DMOs). A standard set of effects is available to every DirectX application. Other DMOs can be registered on the system. All the standard DMOs can process 8-bit or 16-bit PCM data, as well as 32-bit floating-point formats.

To implement effects, a DirectSound application must first call CoInitialize to initialize COM. Doing so does not preclude creating the device object by using DirectSoundCreate8.

Using the DirectSound API, it is not possible to create chains of effects, where the output of multiple buffers is mixed into another buffer containing an effect. Buffer chains are available, however, in content authored for DirectMusic.

To take advantage of hardware-specific effects, use the IKsPropertySet interface.

The following topics contain information on setting up and using effects:

• Setting Effects on Buffers
• Effect Parameters
• Standard Effects
• Audio Effect DMO Wizard