/// <summary>
/// Creates a new <see cref="CapturedImageFrame"/> instance from the <paramref name="frame"/> specified.
/// </summary>
/// <param name="frame">Captured frame.</param>
/// <param name="orientation">Camera orientation.</param>
/// <param name="cameraType">Camera type.</param>
/// <returns>Captured image frame.</returns>
/// <exception cref="ArgumentNullException"><paramref name="frame"/> is <see langword="null"/>.</exception>
/// <exception cref="ArgumentException">
/// <paramref name="frame"/> stream cannot be read.
/// <para>-or-</para>
/// <paramref name="frame"/> stream is empty.
/// </exception>
public static CapturedImageFrame CreateFromCapturedFrame(CapturedFrame frame, PageOrientation orientation, CameraType cameraType)
{
if (frame == null)
{
throw new ArgumentNullException("frame");
}
if (!frame.CanRead)
{
throw new ArgumentException("Frame stream cannot be read.", "frame");
}
if (frame.Size == 0)
{
throw new ArgumentException("Frame stream is empty.", "frame");
}
return(new CapturedImageFrame
{
Rotation = OrientationHelper.ConvertOrientationToRotation(orientation, cameraType),
Flip = OrientationHelper.ConvertOrientationToFlip(orientation, cameraType),
Stream = frame,
Height = frame.Height,
Width = frame.Width
});
}
private async Task <Stream> WriteToStreamAsync(CapturedFrame frame)
{
using (var outputStream = new InMemoryRandomAccessStream())
{
var encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.JpegEncoderId, outputStream);
encoder.IsThumbnailGenerated = false;
encoder.SetSoftwareBitmap(frame.SoftwareBitmap);
try
{
await encoder.FlushAsync();
}
catch (Exception e)
{
Debug.WriteLine(e.Message);
}
await outputStream.FlushAsync();
var ms = new MemoryStream();
await outputStream.AsStream().CopyToAsync(ms);
ms.Position = 0;
return(ms);
}
}
private void CaptureHandler2(
LowLagPhotoSequenceCapture senders, PhotoCapturedEventArgs args)
{
CapturedFrame frame = args.Frame;
// var is IAsyncOperation<TResult>
var result = frame.FlushAsync();
}
async private void CaptureHandler1(
LowLagPhotoSequenceCapture senders, PhotoCapturedEventArgs args)
{
CapturedFrame frame = args.Frame;
// var is bool
var result = await frame.FlushAsync();
}
private async Task SimulateCapturedFrame(CapturedFrame callback)
{
await Task.Run(() =>
{
while (m_isScanActive)
{
// Assume each frame takes 2 sec to get ready.
Task.Delay(2000).Wait();
// Invoke callback and pass back frame data to client.
callback(frameBuffer);
}
});
}
public async Task <int> StartScanning(CapturedFrame callback)
{
int result = -1;
if (m_isConnectionExist == true)
{
// Forward start scan command to the sensor.
result = 0;
m_isScanActive = true;
ScanStarted(null, null);
await SimulateCapturedFrame(callback);
}
return(result);
}
/// <summary>
/// The <see cref="VariablePhotoCapture.PhotoCaptured"/> event handler.
/// </summary>
/// <param name="sender">Event sender.</param>
/// <param name="capturedFrame">Captured frame.</param>
private void VariableCaptureOnPhotoCaptured(object sender, CapturedFrame capturedFrame)
{
Tracing.Trace("PhotoCamera: Variable frame captured.");
this.NotifyPhotoCaptured(CapturedImageFrame.CreateFromCapturedFrame(capturedFrame, this.Orientation, this.CameraType));
}
public void SetPixels(CapturedFrame frame)
{
this.SetPixels(frame.SoftwareBitmap);
}
/// <summary>
/// The <see cref="VariablePhotoCapture.PhotoCaptured"/> event handler.
/// </summary>
/// <param name="sender">Event sender.</param>
/// <param name="capturedFrame">Captured frame.</param>
private void VariableCaptureOnPhotoCaptured(object sender, CapturedFrame capturedFrame)
{
Tracing.Trace("PhotoCamera: Variable frame captured.");
this.NotifyPhotoCaptured(CapturedImageFrame.CreateFromCapturedFrame(capturedFrame, this.Orientation, this.CameraType));
}
/// <summary>
/// Creates a new <see cref="CapturedImageFrame"/> instance from the <paramref name="frame"/> specified.
/// </summary>
/// <param name="frame">Captured frame.</param>
/// <param name="orientation">Camera orientation.</param>
/// <param name="cameraType">Camera type.</param>
/// <returns>Captured image frame.</returns>
/// <exception cref="ArgumentNullException"><paramref name="frame"/> is <see langword="null"/>.</exception>
/// <exception cref="ArgumentException">
/// <paramref name="frame"/> stream cannot be read.
/// <para>-or-</para>
/// <paramref name="frame"/> stream is empty.
/// </exception>
public static CapturedImageFrame CreateFromCapturedFrame(CapturedFrame frame, PageOrientation orientation, CameraType cameraType)
{
if (frame == null)
{
throw new ArgumentNullException("frame");
}
if (!frame.CanRead)
{
throw new ArgumentException("Frame stream cannot be read.", "frame");
}
if (frame.Size == 0)
{
throw new ArgumentException("Frame stream is empty.", "frame");
}
return new CapturedImageFrame
{
Rotation = OrientationHelper.ConvertOrientationToRotation(orientation, cameraType),
Flip = OrientationHelper.ConvertOrientationToFlip(orientation, cameraType),
Stream = frame,
Height = frame.Height,
Width = frame.Width
};
}
