IDirectMusicAudioPath8::SetVolume

The SetVolume method sets the audio volume on the audiopath. The volume can be faded in or out.

Syntax

HRESULT SetVolume(
  long lVolume,
  DWORD dwDuration
);

Parameters

lVolume

Value that specifies the attenuation, in hundredths of a decibel. This value must be in the range from -9600 to 0. Zero is full volume.

dwDuration

Value that specifies the time, in milliseconds, over which the volume change takes place. A value of 0 ensures maximum efficiency.

Return Values

If the method succeeds, the return value is S_OK.

If it fails, the method can return one of the error values shown in the following table.

Remarks

This method works by sending a volume curve message. Any volume events occurring later, such as a band change, override the volume set by this method. IDirectMusicAudioPath8::SetVolume is useful mainly for adjusting currently playing sounds; for example, to fade out before stopping a segment. If you want to make a global change that affects all playback, use one of the following techniques:

• Obtain the buffer object from the audiopath and use IDirectSoundBuffer8::SetVolume.
• Obtain the port object from the audiopath and use IKsControl::KsProperty to change the GUID_DMUS_PROP_Volume property set.
• Set the master volume for the performance. See Setting and Retrieving Global Parameters.

Requirements

  Header: Dmusici.h
  Library: Dmime.dll, Dmimed.dll

See Also

• Cross Fade Sample
• Curves
• IDirectMusicAudioPath8 Interface
• Playing Sounds on Audiopaths