IPerChannelDbLevel Interface
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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:
IPerChannelDbLevel inherits from the IUnknown interface. In addition to the methods inherited from IUnknown, IPerChannelDbLevel supports the following methods.
| Method | Description |
| 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
Client: Windows Vista
Header: Include Devicetopology.h.
See Also
- DeviceTopology API
- IAudioBass Interface
- IAudioMidrange Interface
- IAudioTreble Interface
- IAudioVolumeLevel Interface
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