private async Task InitializeCameraAsync(DeviceInformation preferredDevice)
{
try
{
// if (_mediaCapture == null)
//{
Debug.WriteLine("open device");
// Get the camera devices
try
{
// Create MediaCapture
_mediaCapture = new MediaCapture();
// Initialize MediaCapture and settings
await _mediaCapture.InitializeAsync(
new MediaCaptureInitializationSettings
{
VideoDeviceId = preferredDevice.Id
});
// Handle camera device location
if (preferredDevice.EnclosureLocation == null ||
preferredDevice.EnclosureLocation.Panel == Windows.Devices.Enumeration.Panel.Unknown)
{
Debug.WriteLine("null");
_externalCamera = true;
}
else
{
_externalCamera = false;
_mirroringPreview = (preferredDevice.EnclosureLocation.Panel == Windows.Devices.Enumeration.Panel.Front);
}
// ShowMessage(preferredDevice.EnclosureLocation.ToString());
_rotationHelper = new CameraRotationHelper(preferredDevice.EnclosureLocation);
_rotationHelper.OrientationChanged += RotationHelper_OrientationChanged;
_mediaCapture.GetPreviewRotation();
// Set the preview source for the CaptureElement
PreviewControl.Visibility = Visibility.Visible;
PreviewControl.Source = _mediaCapture;
PreviewControl.FlowDirection = _mirroringPreview ? FlowDirection.RightToLeft : FlowDirection.LeftToRight;
// popUpDisplayText1.Text = "Let's take a picture! Smile~";
// Start viewing through the CaptureElement
await _mediaCapture.StartPreviewAsync();
await SetPreviewRotationAsync();
}
catch (Exception e)
{
ShowMessage(e.ToString());
}
// }
}
catch (UnauthorizedAccessException Error)
{
ShowMessage(Error.ToString());
}
}
/// <summary>
/// control the camera frame invert , flip to the mirror image
/// </summary>
private async Task SetPreviewRotationAsync()
{
if (!_externalCamera)
{
// Add rotation metadata to the preview stream to make sure the aspect ratio / dimensions match when rendering and getting preview frames
var rotation = _rotationHelper.GetCameraPreviewOrientation();
var props = _mediaCapture.VideoDeviceController.GetMediaStreamProperties(MediaStreamType.VideoPreview);
Guid RotationKey = new Guid("C380465D-2271-428C-9B83-ECEA3B4A85C1");
props.Properties.Add(RotationKey, CameraRotationHelper.ConvertSimpleOrientationToClockwiseDegrees(rotation));
await _mediaCapture.SetEncodingPropertiesAsync(MediaStreamType.VideoPreview, props, null);
}
}
private async void RotationHelper_OrientationChanged(object sender, bool updatePreview)
{
if (updatePreview)
{
await SetPreviewRotationAsync();
}
await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () => {
// Rotate the buttons in the UI to match the rotation of the device
var angle = CameraRotationHelper.ConvertSimpleOrientationToClockwiseDegrees(_rotationHelper.GetUIOrientation());
var transform = new RotateTransform {
Angle = angle
};
// The RenderTransform is safe to use (i.e. it won't cause layout issues) in this case, because these buttons have a 1:1 aspect ratio
//CapturePhotoButton.RenderTransform = transform;
//CapturePhotoButton.RenderTransform = transform;
});
}
