ISimpleAudioVolume::SetMute method (audioclient.h)

The SetMute method sets the muting state for the audio session.


  [in] const BOOL bMute,
  [in] LPCGUID    EventContext


[in] bMute

The new muting state. TRUE enables muting. FALSE disables muting.

[in] EventContext

Pointer to the event-context GUID. If a call to this method generates a volume-change event, the session manager sends notifications to all clients that have registered IAudioSessionEvents interfaces with the session manager. The session manager includes the EventContext pointer value with each notification. Upon receiving a notification, a client can determine whether it or another client is the source of the event by inspecting the EventContext value. This scheme depends on the client selecting a value for this parameter that is unique among all clients in the session. If the caller supplies a NULL pointer for this parameter, the client's notification method receives a NULL context pointer.

Return value

If the method succeeds, it returns S_OK. If it fails, possible return codes include, but are not limited to, the values shown in the following table.

Return code Description
The audio endpoint device has been unplugged, or the audio hardware or associated hardware resources have been reconfigured, disabled, removed, or otherwise made unavailable for use.
The Windows audio service is not running.


This method generates a volume-change event only if the method call changes the muting state of the session from disabled to enabled, or from enabled to disabled. For example, if muting is enabled when the call occurs, and the call enables muting, no event is generated.

This method applies the same muting state to all channels in the audio session. The endpoint device always applies muting uniformly across all the channels in the session. There are no IChannelAudioVolume methods for setting the muting states of individual channels.

The client can get the muting state of the audio session by calling the SimpleAudioVolume::GetMute method.


Minimum supported client Windows Vista [desktop apps | UWP apps]
Minimum supported server Windows Server 2008 [desktop apps | UWP apps]
Target Platform Windows
Header audioclient.h

See also

IAudioSessionEvents Interface

IChannelAudioVolume Interface

ISimpleAudioVolume Interface