IPerChannelDbLevel interface

The IPerChannelDbLevel interface represents a generic subunit control interface that provides per-channel control over the volume level, in decibels, of an audio stream or of a frequency band in an audio stream. A positive volume level represents gain, and a negative value represents attenuation.

Clients do not call the methods in this interface directly. Instead, this interface serves as the base interface for the following interfaces, which clients do call directly:

Members

The IPerChannelDbLevel interface inherits from the IUnknown interface. IPerChannelDbLevel also has these types of members:

Methods

The IPerChannelDbLevel interface has these methods.

MethodDescription
GetChannelCount

Gets the number of channels in the audio stream.

GetLevel

Gets the volume level, in decibels, of the specified channel.

GetLevelRange

Gets the range, in decibels, of the volume level of the specified channel.

SetLevel

Sets the volume level, in decibels, of the specified channel.

SetLevelAllChannels

Sets the volume levels, in decibels, of all the channels in the audio stream.

SetLevelUniform

Sets all channels in the audio stream to the same uniform volume level, in decibels.

 

Requirements

Minimum supported client

Windows Vista [desktop apps only]

Minimum supported server

Windows Server 2008 [desktop apps only]

Header

Devicetopology.h

See also

DeviceTopology API
IAudioBass Interface
IAudioMidrange Interface
IAudioTreble Interface
IAudioVolumeLevel Interface

 

 

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