/// <summary>
/// Records an MP4 video to a StorageFile and adds rotation metadata to it
/// </summary>
/// <returns></returns>
private async Task StartRecordingAsync()
{
try
{
// Create storage file for the capture
var videoFile = await _captureFolder.CreateFileAsync("SimpleVideo.mp4", CreationCollisionOption.GenerateUniqueName);
var encodingProfile = MediaEncodingProfile.CreateMp4(VideoEncodingQuality.Auto);
// Calculate rotation angle, taking mirroring into account if necessary
var rotationAngle = CameraRotationHelper.ConvertSimpleOrientationToClockwiseDegrees(_rotationHelper.GetCameraCaptureOrientation());
encodingProfile.Video.Properties.Add(RotationKey, PropertyValue.CreateInt32(rotationAngle));
Debug.WriteLine("Starting recording to " + videoFile.Path);
await _mediaCapture.StartRecordToStorageFileAsync(encodingProfile, videoFile);
_isRecording = true;
Debug.WriteLine("Started recording!");
}
catch (Exception ex)
{
// File I/O errors are reported as exceptions
Debug.WriteLine("Exception when starting video recording: " + ex.ToString());
}
}
/// <summary>
/// Uses the current device orientation in space and page orientation on the screen to calculate the rotation
/// transformation to apply to the controls
/// </summary>
private void UpdateButtonOrientation()
{
// 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
PhotoButton.RenderTransform = transform;
VideoButton.RenderTransform = transform;
}
/// <summary>
/// Gets the current orientation of the UI in relation to the device (when AutoRotationPreferences cannot be honored) and applies a corrective rotation to the preview
/// </summary>
private async Task SetPreviewRotationAsync()
{
// Only need to update the orientation if the camera is mounted on the device
if (_externalCamera)
{
return;
}
// 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);
props.Properties.Add(RotationKey, CameraRotationHelper.ConvertSimpleOrientationToClockwiseDegrees(rotation));
await _mediaCapture.SetEncodingPropertiesAsync(MediaStreamType.VideoPreview, props, null);
}
/// <summary>
/// Cleans up the camera resources (after stopping any video recording and/or preview if necessary) and unregisters from MediaCapture events
/// </summary>
/// <returns></returns>
private async Task CleanupCameraAsync()
{
Debug.WriteLine("CleanupCameraAsync");
if (_isInitialized)
{
// If a recording is in progress during cleanup, stop it to save the recording
if (_isRecording)
{
await StopRecordingAsync();
}
if (_isPreviewing)
{
// The call to stop the preview is included here for completeness, but can be
// safely removed if a call to MediaCapture.Dispose() is being made later,
// as the preview will be automatically stopped at that point
await StopPreviewAsync();
}
_isInitialized = false;
}
if (_mediaCapture != null)
{
_mediaCapture.RecordLimitationExceeded -= MediaCapture_RecordLimitationExceeded;
_mediaCapture.Failed -= MediaCapture_Failed;
_mediaCapture.Dispose();
_mediaCapture = null;
}
if (_rotationHelper != null)
{
_rotationHelper.OrientationChanged -= RotationHelper_OrientationChanged;
_rotationHelper = null;
}
}
/// <summary>
/// Takes a photo to a StorageFile and adds rotation metadata to it
/// </summary>
/// <returns></returns>
private async Task TakePhotoAsync()
{
// While taking a photo, keep the video button enabled only if the camera supports simultaneously taking pictures and recording video
VideoButton.IsEnabled = _mediaCapture.MediaCaptureSettings.ConcurrentRecordAndPhotoSupported;
// Make the button invisible if it's disabled, so it's obvious it cannot be interacted with
VideoButton.Opacity = VideoButton.IsEnabled ? 1 : 0;
var stream = new InMemoryRandomAccessStream();
Debug.WriteLine("Taking photo...");
Speech.Speak("Thank you, authenticating you now.");
await _mediaCapture.CapturePhotoToStreamAsync(ImageEncodingProperties.CreateJpeg(), stream);
try
{
string datetime = DateTime.Now.ToString("yy-MM-dd") + "-" + DateTime.Now.ToString("hh-mm-ss") + ".jpg";
var file = await _captureFolder.CreateFileAsync(datetime, CreationCollisionOption.GenerateUniqueName);
Debug.WriteLine("Photo taken! Saving to " + file.Path);
var photoOrientation = CameraRotationHelper.ConvertSimpleOrientationToPhotoOrientation(_rotationHelper.GetCameraCaptureOrientation());
await ReencodeAndSavePhotoAsync(stream, file, photoOrientation);
Debug.WriteLine("Photo saved!");
IStorageFile storageFile = await StorageFile.GetFileFromPathAsync(file.Path);
IBuffer buffer = await FileIO.ReadBufferAsync(storageFile);
byte[] bytes = System.Runtime.InteropServices.WindowsRuntime.WindowsRuntimeBufferExtensions.ToArray(buffer);
Stream streamer = new MemoryStream(bytes);
Windows.Web.Http.HttpStreamContent streamContent = new Windows.Web.Http.HttpStreamContent(streamer.AsInputStream());
var myFilter = new Windows.Web.Http.Filters.HttpBaseProtocolFilter();
myFilter.AllowUI = false;
var client = new Windows.Web.Http.HttpClient(myFilter);
Windows.Web.Http.HttpResponseMessage result = await client.PostAsync(new Uri(GlobalData.protocol + GlobalData.ip + ":" + GlobalData.port + GlobalData.endpoint), streamContent);
string stringReadResult = await result.Content.ReadAsStringAsync();
Debug.WriteLine(stringReadResult);
JToken token = JObject.Parse(stringReadResult);
int identified = (int)token.SelectToken("Results");
string Response = (string)token.SelectToken("ResponseMessage");
if (identified != 0)
{
Debug.WriteLine("Identified " + identified);
this.Frame.Navigate(typeof(AppHome));
}
else
{
Speech.Speak("Sorry we cannot authorise your request");
}
}
catch (Exception ex)
{
// File I/O errors are reported as exceptions
Debug.WriteLine("Exception when taking a photo: " + ex.ToString());
}
// Done taking a photo, so re-enable the button
VideoButton.IsEnabled = true;
VideoButton.Opacity = 1;
}
/// <summary>
/// Initializes the MediaCapture, registers events, gets camera device information for mirroring and rotating, starts preview and unlocks the UI
/// </summary>
/// <returns></returns>
private async Task InitializeCameraAsync()
{
Debug.WriteLine("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;
}
// Create MediaCapture and its settings
_mediaCapture = new MediaCapture();
// Register for a notification when video recording has reached the maximum time and when something goes wrong
_mediaCapture.RecordLimitationExceeded += MediaCapture_RecordLimitationExceeded;
_mediaCapture.Failed += MediaCapture_Failed;
var settings = new MediaCaptureInitializationSettings {
VideoDeviceId = cameraDevice.Id
};
// Initialize MediaCapture
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);
}
// Initialize rotationHelper
_rotationHelper = new CameraRotationHelper(cameraDevice.EnclosureLocation);
_rotationHelper.OrientationChanged += RotationHelper_OrientationChanged;
await StartPreviewAsync();
UpdateCaptureControls();
}
}
}
