private void ApplyCameraSettings()
{
var parameters = Camera.GetParameters();
parameters.PreviewFormat = ImageFormatType.Nv21;
var supportedFocusModes = parameters.SupportedFocusModes;
if (Build.VERSION.SdkInt >= BuildVersionCodes.IceCreamSandwich &&
supportedFocusModes.Contains(Camera.Parameters.FocusModeContinuousPicture))
{
parameters.FocusMode = Camera.Parameters.FocusModeContinuousPicture;
}
else if (supportedFocusModes.Contains(Camera.Parameters.FocusModeContinuousVideo))
{
parameters.FocusMode = Camera.Parameters.FocusModeContinuousVideo;
}
else if (supportedFocusModes.Contains(Camera.Parameters.FocusModeAuto))
{
parameters.FocusMode = Camera.Parameters.FocusModeAuto;
}
else if (supportedFocusModes.Contains(Camera.Parameters.FocusModeFixed))
{
parameters.FocusMode = Camera.Parameters.FocusModeFixed;
}
var selectedFps = parameters.SupportedPreviewFpsRange.FirstOrDefault();
if (selectedFps != null)
{
// This will make sure we select a range with the lowest minimum FPS
// and maximum FPS which still has the lowest minimum
// This should help maximize performance / support for hardware
foreach (var fpsRange in parameters.SupportedPreviewFpsRange)
{
if (fpsRange[0] <= selectedFps[0] && fpsRange[1] > selectedFps[1])
{
selectedFps = fpsRange;
}
}
parameters.SetPreviewFpsRange(selectedFps[0], selectedFps[1]);
}
var availableResolutions = parameters.SupportedPreviewSizes.Select(sps => new CameraResolution
{
Width = sps.Width,
Height = sps.Height
});
// Try and get a desired resolution from the options selector
var resolution = _scanningOptions.GetResolution(availableResolutions.ToList());
// If the user did not specify a resolution, let's try and find a suitable one
if (resolution == null)
{
foreach (var sps in parameters.SupportedPreviewSizes)
{
if (sps.Width >= 640 && sps.Width <= 1000 && sps.Height >= 360 && sps.Height <= 1000)
{
resolution = new CameraResolution
{
Width = sps.Width,
Height = sps.Height
};
break;
}
}
}
// Google Glass requires this fix to display the camera output correctly
if (Build.Model.Contains("Glass"))
{
resolution = new CameraResolution
{
Width = 640,
Height = 360
};
// Glass requires 30fps
parameters.SetPreviewFpsRange(30000, 30000);
}
// Hopefully a resolution was selected at some point
if (resolution != null)
{
Android.Util.Log.Debug(MobileBarcodeScanner.TAG,
"Selected Resolution: " + resolution.Width + "x" + resolution.Height);
parameters.SetPreviewSize(resolution.Width, resolution.Height);
}
Camera.SetParameters(parameters);
SetCameraDisplayOrientation();
}
bool SetupCaptureSession()
{
var availableResolutions = new List <CameraResolution> ();
var consideredResolutions = new Dictionary <NSString, CameraResolution> {
{ AVCaptureSession.Preset352x288, new CameraResolution {
Width = 352, Height = 288
} },
{ AVCaptureSession.PresetMedium, new CameraResolution {
Width = 480, Height = 360
} }, //480x360
{ AVCaptureSession.Preset640x480, new CameraResolution {
Width = 640, Height = 480
} },
{ AVCaptureSession.Preset1280x720, new CameraResolution {
Width = 1280, Height = 720
} },
{ AVCaptureSession.Preset1920x1080, new CameraResolution {
Width = 1920, Height = 1080
} }
};
// configure the capture session for low resolution, change this if your code
// can cope with more data or volume
session = new AVCaptureSession()
{
SessionPreset = AVCaptureSession.Preset640x480
};
// create a device input and attach it to the session
// var captureDevice = AVCaptureDevice.DefaultDeviceWithMediaType (AVMediaType.Video);
AVCaptureDevice captureDevice = null;
var devices = AVCaptureDevice.DevicesWithMediaType(AVMediaType.Video);
foreach (var device in devices)
{
captureDevice = device;
if (ScanningOptions.UseFrontCameraIfAvailable.HasValue &&
ScanningOptions.UseFrontCameraIfAvailable.Value &&
device.Position == AVCaptureDevicePosition.Front)
{
break; //Front camera successfully set
}
else if (device.Position == AVCaptureDevicePosition.Back && (!ScanningOptions.UseFrontCameraIfAvailable.HasValue || !ScanningOptions.UseFrontCameraIfAvailable.Value))
{
break; //Back camera succesfully set
}
}
if (captureDevice == null)
{
Console.WriteLine("No captureDevice - this won't work on the simulator, try a physical device");
if (overlayView != null)
{
this.AddSubview(overlayView);
this.BringSubviewToFront(overlayView);
}
return(false);
}
CameraResolution resolution = null;
// Find resolution
// Go through the resolutions we can even consider
foreach (var cr in consideredResolutions)
{
// Now check to make sure our selected device supports the resolution
// so we can add it to the list to pick from
if (captureDevice.SupportsAVCaptureSessionPreset(cr.Key))
{
availableResolutions.Add(cr.Value);
}
}
resolution = ScanningOptions.GetResolution(availableResolutions);
// See if the user selected a resolution
if (resolution != null)
{
// Now get the preset string from the resolution chosen
var preset = (from c in consideredResolutions
where c.Value.Width == resolution.Width &&
c.Value.Height == resolution.Height
select c.Key).FirstOrDefault();
// If we found a matching preset, let's set it on the session
if (!string.IsNullOrEmpty(preset))
{
session.SessionPreset = preset;
}
}
var input = AVCaptureDeviceInput.FromDevice(captureDevice);
if (input == null)
{
Console.WriteLine("No input - this won't work on the simulator, try a physical device");
if (overlayView != null)
{
this.AddSubview(overlayView);
this.BringSubviewToFront(overlayView);
}
return(false);
}
else
{
session.AddInput(input);
}
foundResult = false;
//Detect barcodes with built in avcapture stuff
AVCaptureMetadataOutput metadataOutput = new AVCaptureMetadataOutput();
captureDelegate = new CaptureDelegate(metaDataObjects =>
{
if (!analyzing)
{
return;
}
//Console.WriteLine("Found MetaData Objects");
var msSinceLastPreview = (DateTime.UtcNow - lastAnalysis).TotalMilliseconds;
if (msSinceLastPreview < ScanningOptions.DelayBetweenAnalyzingFrames ||
(wasScanned && msSinceLastPreview < ScanningOptions.DelayBetweenContinuousScans) ||
working)
//|| CancelTokenSource.IsCancellationRequested)
{
return;
}
try {
working = true;
wasScanned = false;
lastAnalysis = DateTime.UtcNow;
var mdo = metaDataObjects.FirstOrDefault();
var readableObj = mdo as AVMetadataMachineReadableCodeObject;
if (readableObj == null)
{
return;
}
wasScanned = true;
var zxingFormat = ZXingBarcodeFormatFromAVCaptureBarcodeFormat(readableObj.Type.ToString());
var rs = new ZXing.Result(readableObj.StringValue, null, null, zxingFormat);
resultCallback(rs);
} finally {
working = false;
}
});
metadataOutput.SetDelegate(captureDelegate, DispatchQueue.MainQueue);
session.AddOutput(metadataOutput);
//Setup barcode formats
if (ScanningOptions.PossibleFormats != null && ScanningOptions.PossibleFormats.Count > 0)
{
#if __UNIFIED__
var formats = AVMetadataObjectType.None;
foreach (var f in ScanningOptions.PossibleFormats)
{
formats |= AVCaptureBarcodeFormatFromZXingBarcodeFormat(f);
}
formats &= ~AVMetadataObjectType.None;
metadataOutput.MetadataObjectTypes = formats;
#else
var formats = new List <string> ();
foreach (var f in ScanningOptions.PossibleFormats)
{
formats.AddRange(AVCaptureBarcodeFormatFromZXingBarcodeFormat(f));
}
metadataOutput.MetadataObjectTypes = (from f in formats.Distinct() select new NSString(f)).ToArray();
#endif
}
else
{
metadataOutput.MetadataObjectTypes = metadataOutput.AvailableMetadataObjectTypes;
}
previewLayer = new AVCaptureVideoPreviewLayer(session);
// //Framerate set here (15 fps)
// if (previewLayer.RespondsToSelector(new Selector("connection")))
// {
// if (UIDevice.CurrentDevice.CheckSystemVersion (7, 0))
// {
// var perf1 = PerformanceCounter.Start ();
// NSError lockForConfigErr = null;
// captureDevice.LockForConfiguration (out lockForConfigErr);
// if (lockForConfigErr == null)
// {
// captureDevice.ActiveVideoMinFrameDuration = new CMTime (1, 10);
// captureDevice.UnlockForConfiguration ();
// }
// PerformanceCounter.Stop (perf1, "PERF: ActiveVideoMinFrameDuration Took {0} ms");
// }
// else
// previewLayer.Connection.VideoMinFrameDuration = new CMTime(1, 10);
// }
#if __UNIFIED__
previewLayer.VideoGravity = AVLayerVideoGravity.ResizeAspectFill;
#else
previewLayer.LayerVideoGravity = AVLayerVideoGravity.ResizeAspectFill;
#endif
previewLayer.Frame = new CGRect(0, 0, this.Frame.Width, this.Frame.Height);
previewLayer.Position = new CGPoint(this.Layer.Bounds.Width / 2, (this.Layer.Bounds.Height / 2));
layerView = new UIView(new CGRect(0, 0, this.Frame.Width, this.Frame.Height));
layerView.AutoresizingMask = UIViewAutoresizing.FlexibleWidth | UIViewAutoresizing.FlexibleHeight;
layerView.Layer.AddSublayer(previewLayer);
this.AddSubview(layerView);
ResizePreview(UIApplication.SharedApplication.StatusBarOrientation);
if (overlayView != null)
{
this.AddSubview(overlayView);
this.BringSubviewToFront(overlayView);
//overlayView.LayoutSubviews ();
}
session.StartRunning();
Console.WriteLine("RUNNING!!!");
//output.AlwaysDiscardsLateVideoFrames = true;
Console.WriteLine("SetupCamera Finished");
//session.AddOutput (output);
//session.StartRunning ();
if (captureDevice.IsFocusModeSupported(AVCaptureFocusMode.ContinuousAutoFocus))
{
NSError err = null;
if (captureDevice.LockForConfiguration(out err))
{
if (captureDevice.IsFocusModeSupported(AVCaptureFocusMode.ContinuousAutoFocus))
{
captureDevice.FocusMode = AVCaptureFocusMode.ContinuousAutoFocus;
}
else if (captureDevice.IsFocusModeSupported(AVCaptureFocusMode.AutoFocus))
{
captureDevice.FocusMode = AVCaptureFocusMode.AutoFocus;
}
if (captureDevice.IsExposureModeSupported(AVCaptureExposureMode.ContinuousAutoExposure))
{
captureDevice.ExposureMode = AVCaptureExposureMode.ContinuousAutoExposure;
}
else if (captureDevice.IsExposureModeSupported(AVCaptureExposureMode.AutoExpose))
{
captureDevice.ExposureMode = AVCaptureExposureMode.AutoExpose;
}
if (captureDevice.IsWhiteBalanceModeSupported(AVCaptureWhiteBalanceMode.ContinuousAutoWhiteBalance))
{
captureDevice.WhiteBalanceMode = AVCaptureWhiteBalanceMode.ContinuousAutoWhiteBalance;
}
else if (captureDevice.IsWhiteBalanceModeSupported(AVCaptureWhiteBalanceMode.AutoWhiteBalance))
{
captureDevice.WhiteBalanceMode = AVCaptureWhiteBalanceMode.AutoWhiteBalance;
}
if (UIDevice.CurrentDevice.CheckSystemVersion(7, 0) && captureDevice.AutoFocusRangeRestrictionSupported)
{
captureDevice.AutoFocusRangeRestriction = AVCaptureAutoFocusRangeRestriction.Near;
}
if (captureDevice.FocusPointOfInterestSupported)
{
captureDevice.FocusPointOfInterest = new CGPoint(0.5f, 0.5f);
}
if (captureDevice.ExposurePointOfInterestSupported)
{
captureDevice.ExposurePointOfInterest = new CGPoint(0.5f, 0.5f);
}
captureDevice.UnlockForConfiguration();
}
else
{
Console.WriteLine("Failed to Lock for Config: " + err.Description);
}
}
return(true);
}