void UpdateDeviceFocus(AVCaptureFocusMode focusMode, AVCaptureExposureMode exposureMode, CGPoint point, bool monitorSubjectAreaChange)
{
SessionQueue.DispatchAsync(() => {
if (VideoDeviceInput == null)
{
return;
}
AVCaptureDevice device = VideoDeviceInput.Device;
NSError error;
if (device.LockForConfiguration(out error))
{
// Setting (Focus/Exposure)PointOfInterest alone does not initiate a (focus/exposure) operation.
// Set (Focus/Exposure)Mode to apply the new point of interest.
if (device.FocusPointOfInterestSupported && device.IsFocusModeSupported(focusMode))
{
device.FocusPointOfInterest = point;
device.FocusMode = focusMode;
}
if (device.ExposurePointOfInterestSupported && device.IsExposureModeSupported(exposureMode))
{
device.ExposurePointOfInterest = point;
device.ExposureMode = exposureMode;
}
device.SubjectAreaChangeMonitoringEnabled = monitorSubjectAreaChange;
device.UnlockForConfiguration();
}
else
{
Console.WriteLine("Could not lock device for configuration: {0}", error);
}
});
}
void ChangeCamera(CameraViewController sender)
{
CameraButton.Enabled = false;
RecordButton.Enabled = false;
StillButton.Enabled = false;
SessionQueue.DispatchAsync(() => {
AVCaptureDevice currentVideoDevice = VideoDeviceInput.Device;
AVCaptureDevicePosition preferredPosition = AVCaptureDevicePosition.Unspecified;
AVCaptureDevicePosition currentPosition = currentVideoDevice.Position;
switch (currentPosition)
{
case AVCaptureDevicePosition.Unspecified:
case AVCaptureDevicePosition.Front:
preferredPosition = AVCaptureDevicePosition.Back;
break;
case AVCaptureDevicePosition.Back:
preferredPosition = AVCaptureDevicePosition.Front;
break;
}
AVCaptureDevice videoDevice = CreateDevice(AVMediaType.Video, preferredPosition);
AVCaptureDeviceInput videoDeviceInput = AVCaptureDeviceInput.FromDevice(videoDevice);
Session.BeginConfiguration();
// Remove the existing device input first, since using the front and back camera simultaneously is not supported.
Session.RemoveInput(VideoDeviceInput);
if (Session.CanAddInput(videoDeviceInput))
{
subjectSubscriber.Dispose();
SetFlashModeForDevice(AVCaptureFlashMode.Auto, videoDevice);
subjectSubscriber = NSNotificationCenter.DefaultCenter.AddObserver(AVCaptureDevice.SubjectAreaDidChangeNotification, SubjectAreaDidChange, videoDevice);
Session.AddInput(videoDeviceInput);
VideoDeviceInput = videoDeviceInput;
}
else
{
Session.AddInput(VideoDeviceInput);
}
AVCaptureConnection connection = MovieFileOutput.ConnectionFromMediaType(AVMediaType.Video);
if (connection.SupportsVideoStabilization)
{
connection.PreferredVideoStabilizationMode = AVCaptureVideoStabilizationMode.Auto;
}
Session.CommitConfiguration();
DispatchQueue.MainQueue.DispatchAsync(() => {
CameraButton.Enabled = true;
RecordButton.Enabled = true;
StillButton.Enabled = true;
});
});
}
void ResumeInterruptedSession(CameraViewController sender)
{
SessionQueue.DispatchAsync(() => {
// The session might fail to start running, e.g., if a phone or FaceTime call is still using audio or video.
// A failure to start the session running will be communicated via a session runtime error notification.
// To avoid repeatedly failing to start the session running, we only try to restart the session running in the
// session runtime error handler if we aren't trying to resume the session running.
Session.StartRunning();
SessionRunning = Session.Running;
if (!Session.Running)
{
DispatchQueue.MainQueue.DispatchAsync(() => {
const string message = "Unable to resume";
UIAlertController alertController = UIAlertController.Create("AVCam", message, UIAlertControllerStyle.Alert);
UIAlertAction cancelAction = UIAlertAction.Create("OK", UIAlertActionStyle.Cancel, null);
alertController.AddAction(cancelAction);
PresentViewController(alertController, true, null);
});
}
else
{
DispatchQueue.MainQueue.DispatchAsync(() => {
ResumeButton.Hidden = true;
});
}
});
}
void SessionRuntimeError(NSNotification notification)
{
var error = (NSError)notification.UserInfo [AVCaptureSession.ErrorKey];
Console.WriteLine("Capture session runtime error: {0}", error);
// Automatically try to restart the session running if media services were reset and the last start running succeeded.
// Otherwise, enable the user to try to resume the session running.
if (error.Code == (int)AVError.MediaServicesWereReset)
{
SessionQueue.DispatchAsync(() => {
if (SessionRunning)
{
Session.StartRunning();
SessionRunning = Session.Running;
}
else
{
DispatchQueue.MainQueue.DispatchAsync(() => {
ResumeButton.Hidden = false;
});
}
});
}
else
{
ResumeButton.Hidden = false;
}
}
public override void ViewDidDisappear(bool animated)
{
SessionQueue.DispatchAsync(() => {
if (SetupResult == AVCamSetupResult.Success)
{
Session.StopRunning();
RemoveObservers();
}
});
base.ViewDidDisappear(animated);
}
public override void ViewWillAppear(bool animated)
{
base.ViewWillAppear(animated);
SessionQueue.DispatchAsync(() => {
switch (SetupResult)
{
// Only setup observers and start the session running if setup succeeded.
case AVCamSetupResult.Success:
AddObservers();
Session.StartRunning();
SessionRunning = Session.Running;
break;
case AVCamSetupResult.CameraNotAuthorized:
DispatchQueue.MainQueue.DispatchAsync(() => {
string message = "AVCam doesn't have permission to use the camera, please change privacy settings";
UIAlertController alertController = UIAlertController.Create("AVCam", message, UIAlertControllerStyle.Alert);
UIAlertAction cancelAction = UIAlertAction.Create("OK", UIAlertActionStyle.Cancel, null);
alertController.AddAction(cancelAction);
// Provide quick access to Settings.
UIAlertAction settingsAction = UIAlertAction.Create("Settings", UIAlertActionStyle.Default, action => {
UIApplication.SharedApplication.OpenUrl(new NSUrl(UIApplication.OpenSettingsUrlString));
});
alertController.AddAction(settingsAction);
PresentViewController(alertController, true, null);
});
break;
case AVCamSetupResult.SessionConfigurationFailed:
DispatchQueue.MainQueue.DispatchAsync(() => {
string message = "Unable to capture media";
UIAlertController alertController = UIAlertController.Create("AVCam", message, UIAlertControllerStyle.Alert);
UIAlertAction cancelAction = UIAlertAction.Create("OK", UIAlertActionStyle.Cancel, null);
alertController.AddAction(cancelAction);
PresentViewController(alertController, true, null);
});
break;
}
});
}
void ToggleMovieRecording(CameraViewController sender)
{
// Disable the Camera button until recording finishes, and disable the Record button until recording starts or finishes.
CameraButton.Enabled = false;
RecordButton.Enabled = false;
SessionQueue.DispatchAsync(() => {
if (!MovieFileOutput.Recording)
{
if (UIDevice.CurrentDevice.IsMultitaskingSupported)
{
// Setup background task. This is needed because the IAVCaptureFileOutputRecordingDelegate.FinishedRecording
// callback is not received until AVCam returns to the foreground unless you request background execution time.
// This also ensures that there will be time to write the file to the photo library when AVCam is backgrounded.
// To conclude this background execution, UIApplication.SharedApplication.EndBackgroundTask is called in
// IAVCaptureFileOutputRecordingDelegate.FinishedRecording after the recorded file has been saved.
backgroundRecordingID = UIApplication.SharedApplication.BeginBackgroundTask(null);
}
// Update the orientation on the movie file output video connection before starting recording.
AVCaptureConnection connection = MovieFileOutput.ConnectionFromMediaType(AVMediaType.Video);
var previewLayer = (AVCaptureVideoPreviewLayer)PreviewView.Layer;
connection.VideoOrientation = previewLayer.Connection.VideoOrientation;
// Turn OFF flash for video recording.
SetFlashModeForDevice(AVCaptureFlashMode.Off, VideoDeviceInput.Device);
// Start recording to a temporary file.
MovieFileOutput.StartRecordingToOutputFile(new NSUrl(GetTmpFilePath("mov"), false), this);
}
else
{
MovieFileOutput.StopRecording();
}
});
}
void SnapStillImage(CameraViewController sender)
{
SessionQueue.DispatchAsync(async() => {
AVCaptureConnection connection = StillImageOutput.ConnectionFromMediaType(AVMediaType.Video);
var previewLayer = (AVCaptureVideoPreviewLayer)PreviewView.Layer;
// Update the orientation on the still image output video connection before capturing.
connection.VideoOrientation = previewLayer.Connection.VideoOrientation;
// Flash set to Auto for Still Capture.
SetFlashModeForDevice(AVCaptureFlashMode.Auto, VideoDeviceInput.Device);
// Capture a still image.
try {
var imageDataSampleBuffer = await StillImageOutput.CaptureStillImageTaskAsync(connection);
// The sample buffer is not retained. Create image data before saving the still image to the photo library asynchronously.
NSData imageData = AVCaptureStillImageOutput.JpegStillToNSData(imageDataSampleBuffer);
PHPhotoLibrary.RequestAuthorization(status => {
if (status == PHAuthorizationStatus.Authorized)
{
// To preserve the metadata, we create an asset from the JPEG NSData representation.
// Note that creating an asset from a UIImage discards the metadata.
// In iOS 9, we can use AddResource method on PHAssetCreationRequest class.
// In iOS 8, we save the image to a temporary file and use +[PHAssetChangeRequest creationRequestForAssetFromImageAtFileURL:].
if (UIDevice.CurrentDevice.CheckSystemVersion(9, 0))
{
PHPhotoLibrary.SharedPhotoLibrary.PerformChanges(() => {
var request = PHAssetCreationRequest.CreationRequestForAsset();
request.AddResource(PHAssetResourceType.Photo, imageData, null);
}, (success, err) => {
if (!success)
{
Console.WriteLine("Error occurred while saving image to photo library: {0}", err);
}
});
}
else
{
var temporaryFileUrl = new NSUrl(GetTmpFilePath("jpg"), false);
PHPhotoLibrary.SharedPhotoLibrary.PerformChanges(() => {
NSError error = null;
if (imageData.Save(temporaryFileUrl, NSDataWritingOptions.Atomic, out error))
{
PHAssetChangeRequest.FromImage(temporaryFileUrl);
}
else
{
Console.WriteLine("Error occured while writing image data to a temporary file: {0}", error);
}
}, (success, error) => {
if (!success)
{
Console.WriteLine("Error occurred while saving image to photo library: {0}", error);
}
// Delete the temporary file.
NSError deleteError;
NSFileManager.DefaultManager.Remove(temporaryFileUrl, out deleteError);
});
}
}
});
} catch (NSErrorException ex) {
Console.WriteLine("Could not capture still image: {0}", ex.Error);
}
});
}