The BASS_WASAPI_DEVICEINFO type exposes the following members.
The device is the system default device.
The device is plugged but disabled (in the windows sound control panel) and can not be used.
The device is enabled and can be used (i.e. it is active).
The device is already initialized.
The device is an input (capture) device.
The device is a loopback device (capturing from output).
The device is unplugged and can not be used.
The device supportes recording (either an INPUT or LOOPBACK device).