IAudioTreble Interface
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IAudioTreble Interface
The IAudioTreble interface provides access to a hardware treble-level control. The client obtains a reference to the IAudioTreble interface of a subunit by calling the IPart::Activate method with parameter refiid set to REFIID IID_IAudioTreble. The call to IPart::Activate succeeds only if the subunit supports the IAudioTreble interface. Only a subunit object that represents a hardware function for controlling the level of the treble frequencies in each channel will support this interface.
The IAudioTreble interface provides per-channel controls for setting and getting the gain or attenuation level of the treble frequencies in the audio stream. If a treble-level hardware control can only attenuate the channels in the audio stream, then the maximum treble level for any channel is 0 dB. If a treble-level control can provide gain (amplification), then the maximum treble level is greater than 0 dB.
Most Windows audio adapter drivers support the Windows Driver Model (WDM) and use kernel-streaming (KS) properties to represent the hardware control parameters in subunits (referred to as KS nodes). The IAudioTreble interface provides convenient access to the KSPROPERTY_AUDIO_TREBLE property of a subunit that has a subtype GUID value of KSNODETYPE_TONE. To obtain the subtype GUID of a subunit, call the IPart::GetSubType method. For more information about KS properties and KS node types, see the Windows DDK documentation.
IAudioTreble inherits from the IPerChannelDbLevel interface. The IAudioTreble interface supports only the methods that it inherits from IPerChannelDbLevel.
Requirements
Client: Windows Vista
Header: Include Devicetopology.h.
See Also
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