This section gives the required and optional messages for auxiliary audio device drivers. See “Audio Device Driver Reference,” later in this chapter, for detailed information about any of these messages.
The auxMessage entry-point function for auxiliary audio device drivers must support the following messages.
Requests the capabilities of an auxiliary input device.
Requests the number of auxiliary input devices a driver supports.
The auxMessage entry-point function for auxiliary audio device drivers can optionally support the following messages, depending on the capabilities of the target hardware.
Requests the current volume level setting on an auxiliary audio device.
Sets the volume level on an auxiliary audio device.