/// <summary>
/// Returns audio playout devices including Default option.
/// </summary>
private async Task <ObservableCollection <MediaDevice> > GetAudioPlayoutDevicesAsync()
{
var audioPlayoutDevices = await _mediaSettings.GetAudioPlayoutDevicesAsync();
var result = new ObservableCollection <MediaDevice>(audioPlayoutDevices.Devices);
result.Insert(0, new MediaDevice {
Name = "Default", Id = DefaultAudioDeviceId, IsPreferred = false
});
return(result);
}