public void ShutdownCamera()
{
tokenSource.Cancel();
var theCamera = camera;
camera = null;
// make this asyncronous so that we can return from the view straight away instead of waiting for the camera to release.
Task.Factory.StartNew(() => {
try {
if (theCamera != null)
{
try {
theCamera.SetPreviewCallback(null);
theCamera.StopPreview();
} catch (Exception ex) {
Android.Util.Log.Error(MobileBarcodeScanner.TAG, ex.ToString());
}
theCamera.Release();
}
} catch (Exception e) {
Android.Util.Log.Error(MobileBarcodeScanner.TAG, e.ToString());
} finally {
ReleaseExclusiveAccess();
}
});
}
public void OnAutoFocus(bool success, Android.Hardware.Camera camera)
{
Android.Util.Log.Debug(MobileBarcodeScanner.TAG, "AutoFocused");
Task.Factory.StartNew(() =>
{
int slept = 0;
while (!tokenSource.IsCancellationRequested && slept < 2000)
{
System.Threading.Thread.Sleep(100);
slept += 100;
}
if (!tokenSource.IsCancellationRequested)
{
AutoFocus();
}
});
}
public void OnSurfaceTextureAvailable(Android.Graphics.SurfaceTexture surface, int w, int h)
{
_camera = Camera.Open();
try
{
_camera.SetPreviewTexture(surface);
_camera.SetDisplayOrientation(90);
_camera.StartPreview();
}
catch (Java.IO.IOException ex)
{
Console.WriteLine(ex.Message);
}
Camera.Parameters tmp = _camera.GetParameters();
tmp.FocusMode = Camera.Parameters.FocusModeContinuousPicture;
_camera.SetParameters(tmp);
DrawRectangle();
}
public void OnPreviewFrame(byte[] bytes, Android.Hardware.Camera camera)
{
if (!isAnalyzing)
{
return;
}
//Check and see if we're still processing a previous frame
if (processingTask != null && !processingTask.IsCompleted)
{
return;
}
if ((DateTime.UtcNow - lastPreviewAnalysis).TotalMilliseconds < scanningOptions.DelayBetweenAnalyzingFrames)
{
return;
}
// Delay a minimum between scans
if (wasScanned && ((DateTime.UtcNow - lastPreviewAnalysis).TotalMilliseconds < scanningOptions.DelayBetweenContinuousScans))
{
return;
}
wasScanned = false;
var cameraParameters = camera.GetParameters();
var width = cameraParameters.PreviewSize.Width;
var height = cameraParameters.PreviewSize.Height;
//var img = new YuvImage(bytes, ImageFormatType.Nv21, cameraParameters.PreviewSize.Width, cameraParameters.PreviewSize.Height, null);
lastPreviewAnalysis = DateTime.UtcNow;
processingTask = Task.Factory.StartNew(() => {
try {
if (barcodeReader == null)
{
barcodeReader = new BarcodeReader(null, null, null, (p, w, h, f) =>
new PlanarYUVLuminanceSource(p, w, h, 0, 0, w, h, false));
//new PlanarYUVLuminanceSource(p, w, h, dataRect.Left, dataRect.Top, dataRect.Width(), dataRect.Height(), false))
if (this.scanningOptions.TryHarder.HasValue)
{
barcodeReader.Options.TryHarder = this.scanningOptions.TryHarder.Value;
}
if (this.scanningOptions.PureBarcode.HasValue)
{
barcodeReader.Options.PureBarcode = this.scanningOptions.PureBarcode.Value;
}
if (!string.IsNullOrEmpty(this.scanningOptions.CharacterSet))
{
barcodeReader.Options.CharacterSet = this.scanningOptions.CharacterSet;
}
if (this.scanningOptions.TryInverted.HasValue)
{
barcodeReader.TryInverted = this.scanningOptions.TryInverted.Value;
}
if (this.scanningOptions.PossibleFormats != null && this.scanningOptions.PossibleFormats.Count > 0)
{
barcodeReader.Options.PossibleFormats = new List <BarcodeFormat> ();
foreach (var pf in this.scanningOptions.PossibleFormats)
{
barcodeReader.Options.PossibleFormats.Add(pf);
}
}
}
bool rotate = false;
int newWidth = width;
int newHeight = height;
var cDegrees = getCameraDisplayOrientation(this.activity);
if (cDegrees == 90 || cDegrees == 270)
{
rotate = true;
newWidth = height;
newHeight = width;
}
var start = PerformanceCounter.Start();
if (rotate)
{
bytes = rotateCounterClockwise(bytes, width, height);
}
var result = barcodeReader.Decode(bytes, newWidth, newHeight, RGBLuminanceSource.BitmapFormat.Unknown);
PerformanceCounter.Stop(start, "Decode Time: {0} ms (width: " + width + ", height: " + height + ", degrees: " + cDegrees + ", rotate: " + rotate + ")");
if (result == null || string.IsNullOrEmpty(result.Text))
{
return;
}
Android.Util.Log.Debug(MobileBarcodeScanner.TAG, "Barcode Found: " + result.Text);
wasScanned = true;
callback(result);
} catch (ReaderException) {
Android.Util.Log.Debug(MobileBarcodeScanner.TAG, "No barcode Found");
// ignore this exception; it happens every time there is a failed scan
} catch (Exception) {
// TODO: this one is unexpected.. log or otherwise handle it
throw;
}
});
}
public void StartScanning(Action <Result> scanResultCallback, MobileBarcodeScanningOptions options = null)
{
this.callback = scanResultCallback;
this.options = options ?? MobileBarcodeScanningOptions.Default;
lastPreviewAnalysis = DateTime.UtcNow.AddMilliseconds(options.InitialDelayBeforeAnalyzingFrames);
isAnalyzing = true;
Console.WriteLine("StartScanning");
CheckPermissions();
var perf = PerformanceCounter.Start();
GetExclusiveAccess();
try
{
var version = Build.VERSION.SdkInt;
if (version >= BuildVersionCodes.Gingerbread)
{
Android.Util.Log.Debug(MobileBarcodeScanner.TAG, "Checking Number of cameras...");
var numCameras = Android.Hardware.Camera.NumberOfCameras;
var camInfo = new Android.Hardware.Camera.CameraInfo();
var found = false;
Android.Util.Log.Debug(MobileBarcodeScanner.TAG, "Found " + numCameras + " cameras...");
var whichCamera = CameraFacing.Back;
if (options.UseFrontCameraIfAvailable.HasValue && options.UseFrontCameraIfAvailable.Value)
{
whichCamera = CameraFacing.Front;
}
for (int i = 0; i < numCameras; i++)
{
Android.Hardware.Camera.GetCameraInfo(i, camInfo);
if (camInfo.Facing == whichCamera)
{
Android.Util.Log.Debug(MobileBarcodeScanner.TAG, "Found " + whichCamera + " Camera, opening...");
camera = Android.Hardware.Camera.Open(i);
cameraId = i;
found = true;
break;
}
}
if (!found)
{
Android.Util.Log.Debug(MobileBarcodeScanner.TAG, "Finding " + whichCamera + " camera failed, opening camera 0...");
camera = Android.Hardware.Camera.Open(0);
cameraId = 0;
}
}
else
{
camera = Android.Hardware.Camera.Open();
}
if (camera == null)
{
Android.Util.Log.Debug(MobileBarcodeScanner.TAG, "Camera is null :(");
}
camera.SetPreviewCallback(this);
} catch (Exception ex) {
ShutdownCamera();
Console.WriteLine("Setup Error: " + ex);
}
PerformanceCounter.Stop(perf, "SurfaceCreated took {0}ms");
}
public void StartScanning (Action<Result> scanResultCallback, MobileBarcodeScanningOptions options = null)
{
this.callback = scanResultCallback;
this.options = options ?? MobileBarcodeScanningOptions.Default;
lastPreviewAnalysis = DateTime.UtcNow.AddMilliseconds(options.InitialDelayBeforeAnalyzingFrames);
isAnalyzing = true;
Console.WriteLine ("StartScanning");
CheckPermissions ();
var perf = PerformanceCounter.Start ();
GetExclusiveAccess();
try
{
var version = Build.VERSION.SdkInt;
if (version >= BuildVersionCodes.Gingerbread)
{
Android.Util.Log.Debug (MobileBarcodeScanner.TAG, "Checking Number of cameras...");
var numCameras = Android.Hardware.Camera.NumberOfCameras;
var camInfo = new Android.Hardware.Camera.CameraInfo();
var found = false;
Android.Util.Log.Debug (MobileBarcodeScanner.TAG, "Found " + numCameras + " cameras...");
var whichCamera = CameraFacing.Back;
if (options.UseFrontCameraIfAvailable.HasValue && options.UseFrontCameraIfAvailable.Value)
whichCamera = CameraFacing.Front;
for (int i = 0; i < numCameras; i++)
{
Android.Hardware.Camera.GetCameraInfo(i, camInfo);
if (camInfo.Facing == whichCamera)
{
Android.Util.Log.Debug (MobileBarcodeScanner.TAG, "Found " + whichCamera + " Camera, opening...");
camera = Android.Hardware.Camera.Open(i);
cameraId = i;
found = true;
break;
}
}
if (!found)
{
Android.Util.Log.Debug(MobileBarcodeScanner.TAG, "Finding " + whichCamera + " camera failed, opening camera 0...");
camera = Android.Hardware.Camera.Open(0);
cameraId = 0;
}
}
else
{
camera = Android.Hardware.Camera.Open();
}
if (camera == null)
Android.Util.Log.Debug(MobileBarcodeScanner.TAG, "Camera is null :(");
camera.SetPreviewCallback (this);
} catch (Exception ex) {
ShutdownCamera ();
Console.WriteLine("Setup Error: " + ex);
}
PerformanceCounter.Stop (perf, "SurfaceCreated took {0}ms");
}
public void ShutdownCamera ()
{
tokenSource.Cancel();
var theCamera = camera;
camera = null;
// make this asyncronous so that we can return from the view straight away instead of waiting for the camera to release.
Task.Factory.StartNew(() => {
try {
if (theCamera != null) {
try {
theCamera.SetPreviewCallback(null);
theCamera.StopPreview();
} catch (Exception ex) {
Android.Util.Log.Error (MobileBarcodeScanner.TAG, ex.ToString ());
}
theCamera.Release();
}
} catch (Exception e) {
Android.Util.Log.Error(MobileBarcodeScanner.TAG, e.ToString());
} finally {
ReleaseExclusiveAccess();
}
});
}
