private void PrepareAndStartCamera()
{
_camera.StopPreview();
var display = _activity.WindowManager.DefaultDisplay;
if (display.Rotation == SurfaceOrientation.Rotation0)
{
_camera.SetDisplayOrientation(90);
}
if (display.Rotation == SurfaceOrientation.Rotation270)
{
_camera.SetDisplayOrientation(180);
}
_camera.StartPreview();
_timer = new Timer(async state =>
{
var image = _textureView.Bitmap;
var imageStream = new MemoryStream();
await image.CompressAsync(Bitmap.CompressFormat.Jpeg, 50, imageStream);
image.Recycle();
NewFrameCaptured?.Invoke(this, new NewFrameEventArgs(new Models.VideoFrame
{
ImageBytes = imageStream.ToArray(),
Timestamp = DateTime.Now
}));
imageStream.Dispose();
}, null, TimeSpan.Zero, TimeSpan.FromSeconds(0.5));
}
private async Task StartPreviewAsync()
{
// Prevent the device from sleeping while the preview is running
_displayRequest.RequestActive();
// Setup preview source in UI and mirror if required
VideoCapture.Source = _mediaCapture;
VideoCapture.FlowDirection = _mirroringPreview ? FlowDirection.RightToLeft : FlowDirection.LeftToRight;
this.VideoProperties = this._mediaCapture.VideoDeviceController.GetMediaStreamProperties(MediaStreamType.VideoPreview) as VideoEncodingProperties;
// Start preview
await _mediaCapture.StartPreviewAsync();
_isPreviewing = true;
if (_isPreviewing)
{
await SetPreviewRotationAsync();
}
_timer = new DispatcherTimer
{
Interval = TimeSpan.FromSeconds(0.5)
};
_timer.Tick += async(sender, o) =>
{
if (_mediaCapture == null)
{
return;
}
const BitmapPixelFormat inputPixelFormat = BitmapPixelFormat.Bgra8;
var previewFrame = new Windows.Media.VideoFrame(inputPixelFormat, CameraResolutionWidth, CameraResolutionHeight);
await _mediaCapture.GetPreviewFrameAsync(previewFrame);
var imageBytes = await GetPixelBytesFromSoftwareBitmapAsync(previewFrame.SoftwareBitmap);
NewFrameCaptured?.Invoke(this, new NewFrameEventArgs(new Models.VideoFrame()
{
ImageBytes = imageBytes,
Timestamp = DateTime.Now
}));
previewFrame.Dispose();
};
_timer.Start();
}
