private AudioCaptureControl()
{
this.mediaCaptureSemaphore = new SemaphoreSlim(1, 1);
// We will query and monitor the microphone capability for audio input; the call to RequestAccessAsync needs to occur once we've
// created a page so it can pop a consent prompt.
this.MicrophoneCapability = AppCapability.Create("microphone");
this.MicrophoneCapability.AccessChanged += (capability, args) =>
{
if (capability.CheckAccess() == AppCapabilityAccessStatus.Allowed)
{
_ = this.StartVolumePollingAsync();
}
};
// We'll also monitor the audio input devices available on the system. This allows clear feedback to users when no device is connected
// as well as responsiveness to devices being added or removed.
this.captureDeviceWatcher = DeviceInformation.CreateWatcher(DeviceClass.AudioCapture);
this.captureDeviceWatcher.Added += async(s, e)
=> await this.OnAudioCaptureDevicesChangedAsync();
this.captureDeviceWatcher.Removed += async(s, e)
=> await this.OnAudioCaptureDevicesChangedAsync();
this.captureDeviceWatcher.Updated += async(s, e)
=> await this.OnAudioCaptureDevicesChangedAsync();
this.enumerationCompletedEvent = new ManualResetEventSlim(false);
this.captureDeviceWatcher.EnumerationCompleted += (s, e) =>
{
this.firstEnumerationCompleted = true;
this.enumerationCompletedEvent.Set();
};
this.captureDeviceWatcher.Start();
}
protected override void OnNavigatedTo(NavigationEventArgs e)
{
// Specify which capability we want to query/monitor.
locationCapability = AppCapability.Create("location");
// Register a handler to be called when access changes.
locationCapability.AccessChanged += OnCapabilityAccessChanged;
// Update UI to match current access.
UpdateCapabilityStatus();
}