void UpdateButtonOrientation()
{
// Rotate the UI app bar button to match the rotation of the device
var angle = CameraRotationHelper.ConvertSimpleOrientationToClockwiseDegrees(_rotationHelper.GetUIOrientation());
var transform = new RotateTransform {
Angle = angle
};
_takePhotoButton.RenderTransform = transform;
}
async Task InitializeCameraAsync()
{
if (_mediaCapture == null)
{
// Attempt to get the back camera if one is available, but use any camera device if not
var cameraDevice = await FindCameraDeviceByPanelAsync(Windows.Devices.Enumeration.Panel.Back);
if (cameraDevice == null)
{
Debug.WriteLine("No camera device found.");
return;
}
_mediaCapture = new MediaCapture();
var settings = new MediaCaptureInitializationSettings {
VideoDeviceId = cameraDevice.Id
};
try
{
await _mediaCapture.InitializeAsync(settings);
_isInitialized = true;
}
catch (UnauthorizedAccessException)
{
Debug.WriteLine("The app was denied access to the camera.");
}
// If initialization succeeded, start the preview
if (_isInitialized)
{
// Figure out where the camera is located
if (cameraDevice.EnclosureLocation == null || cameraDevice.EnclosureLocation.Panel == Windows.Devices.Enumeration.Panel.Unknown)
{
// No information on the location of the camera, assume it's an external camera, not integrated on the device
_externalCamera = true;
}
else
{
// Camera is fixed on the device
_externalCamera = false;
// Only mirror the preview if the camera is on the front panel
_mirroringPreview = (cameraDevice.EnclosureLocation.Panel == Windows.Devices.Enumeration.Panel.Front);
}
_rotationHelper = new CameraRotationHelper(cameraDevice.EnclosureLocation);
_rotationHelper.OrientationChanged += OnOrientationChanged;
await StartPreviewAsync();
}
}
}
async Task SetPreviewRotationAsync()
{
// Only update the orientation if the camera is mounted on the device
if (_externalCamera)
{
return;
}
// Add rotation metadata to the preview stream to ensure aspect ratio/dimensions match when rendering and getting preview frames
var orientation = _rotationHelper.GetCameraPreviewOrientation();
var properties = _mediaCapture.VideoDeviceController.GetMediaStreamProperties(MediaStreamType.VideoPreview);
properties.Properties.Add(RotationKey, CameraRotationHelper.ConvertSimpleOrientationToClockwiseDegrees(orientation));
await _mediaCapture.SetEncodingPropertiesAsync(MediaStreamType.VideoPreview, properties, null);
}
async Task TakePhotoAsync()
{
var stream = new InMemoryRandomAccessStream();
await _mediaCapture.CapturePhotoToStreamAsync(ImageEncodingProperties.CreateJpeg(), stream);
try
{
var file = await _captureFolder.CreateFileAsync("Photo.jpg", CreationCollisionOption.GenerateUniqueName);
var orientation = CameraRotationHelper.ConvertSimpleOrientationToPhotoOrientation(_rotationHelper.GetCameraCaptureOrientation());
await ReencodeAndSavePhotoAsync(stream, file, orientation);
Debug.WriteLine("Photo saved to " + file.Path);
}
catch (Exception ex)
{
Debug.WriteLine("Exception when taking photo: " + ex.ToString());
}
}
async Task CleanupCameraAsync()
{
if (_isInitialized)
{
if (_isPreviewing)
{
await StopPreviewAsync();
}
_isInitialized = false;
}
if (_mediaCapture != null)
{
_mediaCapture.Dispose();
_mediaCapture = null;
}
if (_rotationHelper != null)
{
_rotationHelper.OrientationChanged -= OnOrientationChanged;
_rotationHelper = null;
}
}
