// Must be called on the UI thread
private async Task DisposeCaptureAsync()
{
Preview.Source = null;
if (autoFocus != null)
{
autoFocus.Dispose();
autoFocus = null;
}
MediaCapture mediaCapture;
lock (this)
{
mediaCapture = this.mediaCapture;
this.mediaCapture = null;
}
if (mediaCapture != null)
{
mediaCapture.Failed -= OnMediaCaptureFailed;
await mediaCapture.StopPreviewAsync();
mediaCapture.Dispose();
}
}
// Must be called on the UI thread
private async Task DisposeCaptureAsync()
{
Preview.Source = null;
if (m_autoFocus != null)
{
m_autoFocus.Dispose();
m_autoFocus = null;
}
MediaCapture capture;
lock (this)
{
capture = m_capture;
m_capture = null;
}
if (capture != null)
{
capture.Failed -= capture_Failed;
await capture.StopPreviewAsync();
capture.Dispose();
}
}
/// <summary>
/// Initializes the UI, camera and start scanning for QR codes.
/// </summary>
private async Task InitializeAndStartScanningAsync()
{
SetupUi();
await InitializeCameraAsync();
if (_isInitialized)
{
FocusControl focusControl = _mediaCapture.VideoDeviceController.FocusControl;
if (focusControl != null)
{
_continuousAutoFocus = await ContinuousAutoFocus.StartAsync(focusControl);
}
}
StartScanningForQrCodeAsync();
}
// Must be called on the UI thread
private async Task DisposeCaptureAsync()
{
Preview.Source = null;
if (m_autoFocus != null)
{
m_autoFocus.Dispose();
m_autoFocus = null;
}
MediaCapture capture;
lock (this)
{
capture = m_capture;
m_capture = null;
}
if (capture != null)
{
capture.Failed -= capture_Failed;
await capture.StopPreviewAsync();
capture.Dispose();
}
}
private async Task InitializeCaptureAsync()
{
if (m_initializing || (m_capture != null))
{
return;
}
m_initializing = true;
try
{
var settings = new MediaCaptureInitializationSettings
{
VideoDeviceId = await GetBackOrDefaulCameraIdAsync(),
StreamingCaptureMode = StreamingCaptureMode.Video
};
var capture = new MediaCapture();
await capture.InitializeAsync(settings);
// Select the capture resolution closest to screen resolution
var formats = capture.VideoDeviceController.GetAvailableMediaStreamProperties(MediaStreamType.VideoPreview);
var format = (VideoEncodingProperties)formats.OrderBy((item) =>
{
var props = (VideoEncodingProperties)item;
return Math.Abs(props.Width - this.ActualWidth) + Math.Abs(props.Height - this.ActualHeight);
}).First();
await capture.VideoDeviceController.SetMediaStreamPropertiesAsync(MediaStreamType.VideoPreview, format);
// Make the preview full screen
var scale = Math.Min(this.ActualWidth / format.Width, this.ActualHeight / format.Height);
Preview.Width = format.Width;
Preview.Height = format.Height;
Preview.RenderTransformOrigin = new Point(.5, .5);
Preview.RenderTransform = new ScaleTransform { ScaleX = scale, ScaleY = scale };
BarcodeOutline.Width = format.Width;
BarcodeOutline.Height = format.Height;
BarcodeOutline.RenderTransformOrigin = new Point(.5, .5);
BarcodeOutline.RenderTransform = new ScaleTransform { ScaleX = scale, ScaleY = scale };
// Enable QR code detection
var definition = new LumiaAnalyzerDefinition(ColorMode.Yuv420Sp, 640, AnalyzeBitmap);
await capture.AddEffectAsync(MediaStreamType.VideoPreview, definition.ActivatableClassId, definition.Properties);
// Start preview
m_time.Restart();
Preview.Source = capture;
await capture.StartPreviewAsync();
capture.Failed += capture_Failed;
m_autoFocus = await ContinuousAutoFocus.StartAsync(capture.VideoDeviceController.FocusControl);
m_capture = capture;
}
catch (Exception e)
{
TextLog.Text = String.Format("Failed to start the camera: {0}", e.Message);
}
m_initializing = false;
}
private async Task InitializeCaptureAsync()
{
if (isMediaCaptureInitializing || (mediaCapture != null))
{
return;
}
isMediaCaptureInitializing = true;
try
{
var settings = new MediaCaptureInitializationSettings
{
VideoDeviceId = await GetBackOrDefaulCameraIdAsync(),
StreamingCaptureMode = StreamingCaptureMode.Video
};
var newMediaCapture = new MediaCapture();
await newMediaCapture.InitializeAsync(settings);
// Select the capture resolution closest to screen resolution
var formats = newMediaCapture.VideoDeviceController.GetAvailableMediaStreamProperties(MediaStreamType.VideoPreview);
var format = (VideoEncodingProperties)formats.OrderBy((item) =>
{
var props = (VideoEncodingProperties)item;
return(Math.Abs(props.Width - this.ActualHeight) + Math.Abs(props.Height - this.ActualWidth));
}).First();
Debug.WriteLine("{0} x {1}", format.Width, format.Height);
await newMediaCapture.VideoDeviceController.SetMediaStreamPropertiesAsync(MediaStreamType.VideoPreview, format);
// Disable flash control if supported
if (newMediaCapture.VideoDeviceController.FlashControl.Supported)
{
newMediaCapture.VideoDeviceController.FlashControl.Enabled = false;
}
// Prepare bitmap for reports
bitmapWithBarcode = new WriteableBitmap((int)format.Width, (int)format.Height);
// Make the preview full screen
Preview.Width = this.ActualHeight;
Preview.Height = this.ActualWidth;
// Enable QR code detection
var definition = new LumiaAnalyzerDefinition(ColorMode.Yuv420Sp, Math.Min(format.Width, 800), AnalyzeBitmap);
await newMediaCapture.AddEffectAsync(MediaStreamType.VideoPreview, definition.ActivatableClassId, definition.Properties);
// Start preview
Preview.Source = newMediaCapture;
await newMediaCapture.StartPreviewAsync();
newMediaCapture.Failed += OnMediaCaptureFailed;
autoFocus = await ContinuousAutoFocus.StartAsync(newMediaCapture.VideoDeviceController.FocusControl);
mediaCapture = newMediaCapture;
}
catch (Exception e)
{
Debug.WriteLine("Failed to start the camera: {0}", e.Message);
}
isMediaCaptureInitializing = false;
}
private async Task InitializeCaptureAsync()
{
if (m_initializing || (m_capture != null))
{
return;
}
m_initializing = true;
try
{
var settings = new MediaCaptureInitializationSettings
{
VideoDeviceId = await GetBackOrDefaulCameraIdAsync(),
StreamingCaptureMode = StreamingCaptureMode.Video
};
var capture = new MediaCapture();
await capture.InitializeAsync(settings);
// Select the capture resolution closest to screen resolution
var formats = capture.VideoDeviceController.GetAvailableMediaStreamProperties(MediaStreamType.VideoPreview);
var format = (VideoEncodingProperties)formats.OrderBy((item) =>
{
var props = (VideoEncodingProperties)item;
return(Math.Abs(props.Width - this.ActualWidth) + Math.Abs(props.Height - this.ActualHeight));
}).First();
await capture.VideoDeviceController.SetMediaStreamPropertiesAsync(MediaStreamType.VideoPreview, format);
// Make the preview full screen
var scale = Math.Min(this.ActualWidth / format.Width, this.ActualHeight / format.Height);
Preview.Width = format.Width;
Preview.Height = format.Height;
Preview.RenderTransformOrigin = new Point(.5, .5);
Preview.RenderTransform = new ScaleTransform {
ScaleX = scale, ScaleY = scale
};
BarcodeOutline.Width = format.Width;
BarcodeOutline.Height = format.Height;
BarcodeOutline.RenderTransformOrigin = new Point(.5, .5);
BarcodeOutline.RenderTransform = new ScaleTransform {
ScaleX = scale, ScaleY = scale
};
// Enable QR code detection
var definition = new LumiaAnalyzerDefinition(ColorMode.Yuv420Sp, 640, AnalyzeBitmap);
await capture.AddEffectAsync(MediaStreamType.VideoPreview, definition.ActivatableClassId, definition.Properties);
// Start preview
m_time.Restart();
Preview.Source = capture;
await capture.StartPreviewAsync();
capture.Failed += capture_Failed;
m_autoFocus = await ContinuousAutoFocus.StartAsync(capture.VideoDeviceController.FocusControl);
m_capture = capture;
}
catch (Exception e)
{
TextLog.Text = String.Format("Failed to start the camera: {0}", e.Message);
}
m_initializing = false;
}
