Create
Allocates and initializes an instance of the level control class.
Declaration
static OSSharedPtr<IOUserAudioLevelControl> Create(IOUserAudioDriver *in_driver, bool in_is_settable, float in_decibel_value, IOUserAudioLevelControlRange in_decibel_range, IOUserAudioObjectPropertyElement in_control_element, IOUserAudioObjectPropertyScope in_control_scope, IOUserAudioClassID in_control_class_id);Parameters
- in_driver:
The Iouseraudiodriver that owns this object.
- in_is_settable:
A Boolean value that indicates if the control can be set.
- in_decibel_value:
A floating-point value that represents the level control’s current value in decibels.
- in_decibel_range:
A Iouseraudiolevelcontrolrange that describes the minimum and maximum values of the level control.
- in_control_element:
An Iouseraudioobjectpropertyelement to identify the control.
- in_control_scope:
A Iouseraudioobjectpropertyscope indicating the control’s scope: input, output, global, or play-through.
- in_control_class_id:
The Iouseraudioclassid of the control.
Return Value
A poiner to an IOUserAudioLevelControl, if allocation and initialization succeeded.
Discussion
If you subclass IOUserAudioLevelControl to override this class’ behavior, don’t use Create to allocate and initialize the custom subclass.