public void SetupCamera()
{
if (Camera != null)
{
return;
}
var perf = PerformanceCounter.Start();
OpenCamera();
PerformanceCounter.Stop(perf, "Setup Camera took {0}ms");
if (Camera == null)
{
return;
}
perf = PerformanceCounter.Start();
ApplyCameraSettings();
try
{
Camera.SetPreviewDisplay(holder);
var previewParameters = Camera.GetParameters();
var previewSize = previewParameters.PreviewSize;
var bitsPerPixel = ImageFormat.GetBitsPerPixel(previewParameters.PreviewFormat);
var bufferSize = (previewSize.Width * previewSize.Height * bitsPerPixel) / 8;
const int NUM_PREVIEW_BUFFERS = 5;
for (uint i = 0; i < NUM_PREVIEW_BUFFERS; ++i)
{
using (var buffer = new FastJavaByteArray(bufferSize))
Camera.AddCallbackBuffer(buffer);
}
Camera.StartPreview();
Camera.SetNonMarshalingPreviewCallback(cameraEventListener);
// Docs suggest if Auto or Macro modes, we should invoke AutoFocus at least once
var currentFocusMode = Camera.GetParameters().FocusMode;
if (currentFocusMode == Camera.Parameters.FocusModeAuto ||
currentFocusMode == Camera.Parameters.FocusModeMacro)
{
AutoFocus();
}
}
catch (Exception ex)
{
Android.Util.Log.Debug(MobileBarcodeScanner.TAG, ex.ToString());
return;
}
finally
{
PerformanceCounter.Stop(perf, "Setup Camera Parameters took {0}ms");
}
}
public void SetupCamera()
{
if (camera != null)
{
return;
}
PermissionsHandler.CheckCameraPermissions(context);
OpenCamera();
if (camera == null)
{
return;
}
ApplyCameraSettings();
try
{
camera.SetPreviewDisplay(holder);
var previewParameters = camera.GetParameters();
var previewSize = previewParameters.PreviewSize;
var bitsPerPixel = ImageFormat.GetBitsPerPixel(previewParameters.PreviewFormat);
int bufferSize = (previewSize.Width * previewSize.Height * bitsPerPixel) / 8;
const int NUM_PREVIEW_BUFFERS = 5;
for (uint i = 0; i < NUM_PREVIEW_BUFFERS; ++i)
{
using (var buffer = new FastJavaByteArray(bufferSize))
camera.AddCallbackBuffer(buffer);
}
camera.StartPreview();
camera.SetNonMarshalingPreviewCallback(cameraEventListener);
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine(ex.ToString());
return;
}
finally
{
}
}
public void OnPreviewFrame(byte[] data, Camera camera)
{
if (!_busy && ImagePreview != null)
try
{
_busy = true;
Camera.Size cSize = camera.GetParameters().PreviewSize;
_imageSize = new Size(cSize.Width, cSize.Height);
Size size = _imageSize;
Image<Bgr, Byte> image = _bgrBuffers.GetBuffer(size, 0);
GCHandle handle = GCHandle.Alloc(data, GCHandleType.Pinned);
using (Image<Gray, Byte> yuv420sp = new Image<Gray, byte>(size.Width, (size.Height >> 1) * 3, size.Width, handle.AddrOfPinnedObject()))
{
ImagePreview(this, new ImagePreviewEventArgs(yuv420sp, image));
}
handle.Free();
Invalidate();
}
finally
{
_busy = false;
}
if (_cameraPreviewCallbackWithBuffer)
camera.AddCallbackBuffer(data);
}
