private async Task UpdatePreviewOrientationAsync()
{
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).AsTask().ConfigureAwait(false);
}
private async Task CapturePhotoAsync(CameraForView cameraForView, JObject options, IPromise promise)
{
var mediaCapture = cameraForView.MediaCapture;
var encoding = ImageEncodingProperties.CreateJpeg();
var target = options.Value <int>("target");
using (var stream = new InMemoryRandomAccessStream())
{
await mediaCapture.CapturePhotoToStreamAsync(encoding, stream).AsTask().ConfigureAwait(false);
if (target == CameraCaptureTargetMemory)
{
var data = await GetBase64DataAsync(stream).ConfigureAwait(false);
promise.Resolve(new JObject
{
{ "data", data },
});
}
else
{
var storageFile = await GetOutputStorageFileAsync(MediaTypeImage, target).AsTask().ConfigureAwait(false);
var orientation = await cameraForView.GetCameraCaptureOrientationAsync().ConfigureAwait(false);
var photoOrientation = CameraRotationHelper.ConvertSimpleOrientationToPhotoOrientation(orientation);
await ReencodeAndSavePhotoAsync(stream, storageFile, photoOrientation).ConfigureAwait(false);
; await UpdateImagePropertiesAsync(storageFile, options).ConfigureAwait(false);
promise.Resolve(new JObject
{
{ "path", storageFile.Path },
});
}
}
}
private async Task InitializeMediaCaptureAsync()
{
// Do not use ConfigureAwait(false), subsequent calls must come from Dispatcher thread
var devices = await DeviceInformation.FindAllAsync(DeviceClass.VideoCapture);
var device = _panel.HasValue
? devices.FirstOrDefault(d => d.EnclosureLocation?.Panel == _panel)
: devices.FirstOrDefault();
// TODO: remove this hack, it defaults the camera to any camera if it cannot find one for a specific panel
device = device ?? devices.FirstOrDefault();
if (device == null)
{
throw new InvalidOperationException("Could not find camera device.");
}
_rotationHelper = new CameraRotationHelper(device.EnclosureLocation);
_rotationHelper.OrientationChanged += OnOrientationChanged;
// Initialize for panel
var settings = new MediaCaptureInitializationSettings
{
VideoDeviceId = device.Id,
};
// Do not use ConfigureAwait(false), subsequent calls must come from Dispatcher thread
await MediaCapture.InitializeAsync(settings);
// Set flash modes
MediaCapture.SetFlashMode(FlashMode);
MediaCapture.SetTorchMode(TorchMode);
// Set to capture element
CaptureElement.Source = MediaCapture;
// Mirror for front facing camera
CaptureElement.FlowDirection = _panel == Windows.Devices.Enumeration.Panel.Front
? FlowDirection.RightToLeft
: FlowDirection.LeftToRight;
// Start preview
// Do not `ConfigureAwait(false), orientation must be set on Dispatcher thread
await MediaCapture.StartPreviewAsync();
// Set preview rotation
await UpdatePreviewOrientationAsync().ConfigureAwait(false);
// Start barcode scanning
if (BarcodeScanningEnabled)
{
_barcodeScanningSubscription.Disposable =
GetBarcodeScanningObservable().Subscribe(result =>
{
BarcodeScanned?.Invoke(result);
});
}
IsInitialized = true;
lock (_initializationGate)
{
_initializationTask = null;
}
}
private async Task RecordAsync(CameraForView cameraForView, JObject options, IPromise promise, CancellationToken token)
{
var mediaCapture = cameraForView.MediaCapture;
var taskCompletionSource = new TaskCompletionSource <bool>();
using (var cancellationTokenSource = new CancellationTokenSource())
using (token.Register(cancellationTokenSource.Cancel))
using (cancellationTokenSource.Token.Register(async() => await StopRecordingAsync(mediaCapture, taskCompletionSource)))
{
var quality = (VideoEncodingQuality)options.Value <int>("quality");
var encodingProfile = MediaEncodingProfile.CreateMp4(quality);
mediaCapture.AudioDeviceController.Muted = options.Value <bool>("audio");
var orientation = await cameraForView.GetCameraCaptureOrientationAsync().ConfigureAwait(false);
encodingProfile.Video.Properties.Add(RotationKey, CameraRotationHelper.ConvertSimpleOrientationToClockwiseDegrees(orientation));
var stream = default(InMemoryRandomAccessStream);
try
{
var target = options.Value <int>("target");
var outputFile = default(StorageFile);
if (target == CameraCaptureTargetMemory)
{
stream = new InMemoryRandomAccessStream();
await mediaCapture.StartRecordToStreamAsync(encodingProfile, stream).AsTask().ConfigureAwait(false);
}
else
{
outputFile = await GetOutputStorageFileAsync(MediaTypeVideo, target).AsTask().ConfigureAwait(false);
await mediaCapture.StartRecordToStorageFileAsync(encodingProfile, outputFile).AsTask().ConfigureAwait(false);
}
if (options.ContainsKey("totalSeconds"))
{
var totalSeconds = options.Value <double>("totalSeconds");
if (totalSeconds > 0)
{
cancellationTokenSource.CancelAfter(TimeSpan.FromSeconds(totalSeconds));
}
}
await taskCompletionSource.Task.ConfigureAwait(false);
if (target == CameraCaptureTargetMemory)
{
var data = await GetBase64DataAsync(stream).ConfigureAwait(false);
promise.Resolve(new JObject
{
{ "data", data },
});
}
else
{
await UpdateVideoPropertiesAsync(outputFile, options).ConfigureAwait(false);
promise.Resolve(new JObject
{
{ "path", outputFile.Path },
});
}
}
finally
{
stream?.Dispose();
}
}
_recordingCancellation.Dispose();
_recordingTask = null;
}