Camera app freezes during phone call - ios

Question

I have a bug in my camera app. If you open the app while on a phone call, the entire app freezes. I've tried using AVCaptureSessionWasInterrupted and AVCaptureSessionInterruptionEnded notifications to handle the audio input management during a phone call, but have had no luck fixing the issue. When I comment out the audio input setup, the app no longer freezes during a phone call, so I'm pretty confident the issue lies somewhere with the audio management.
Why is the app freezing during phone calls and how can I fix it?
Thanks in advance!
Relevant code:
class CameraManager: NSObject {
static let shared = CameraManager()
private let notificationQueue = OperationQueue.main
var delegate: CameraManagerDelegate? = nil
let session = AVCaptureSession()
var captureDeviceInput: AVCaptureDeviceInput? = nil
var audioInput: AVCaptureDeviceInput? = nil
let photoOutput = AVCapturePhotoOutput()
let videoOutput = AVCaptureMovieFileOutput()
var isRecording: Bool {
return videoOutput.isRecording
}
func getCurrentVideoCaptureDevice() throws -> AVCaptureDevice {
guard let device = self.captureDeviceInput?.device else {
throw CameraManagerError.missingCaptureDeviceInput
}
return device
}
func getZoomFactor() throws -> CGFloat {
return try getCurrentVideoCaptureDevice().videoZoomFactor
}
func getMaxZoomFactor() throws -> CGFloat {
return try getCurrentVideoCaptureDevice().activeFormat.videoMaxZoomFactor
}
override init() {
super.init()
NotificationCenter.default.addObserver(forName: Notification.Name.UIApplicationDidBecomeActive, object: nil, queue: notificationQueue) { [unowned self] (notification) in
self.session.startRunning()
try? self.setupCamera()
try? self.setZoomLevel(zoomLevel: 1.0)
if Settings.shared.autoRecord {
try? self.startRecording()
}
}
NotificationCenter.default.addObserver(forName: Notification.Name.UIApplicationWillResignActive, object: nil, queue: notificationQueue) { [unowned self] (notification) in
self.stopRecording()
self.session.stopRunning()
}
NotificationCenter.default.addObserver(forName: Notification.Name.AVCaptureSessionWasInterrupted, object: nil, queue: notificationQueue) { [unowned self] (notification) in
if let audioInput = self.audioInput {
self.session.removeInput(audioInput)
}
}
NotificationCenter.default.addObserver(forName: Notification.Name.AVCaptureSessionInterruptionEnded, object: nil, queue: notificationQueue) { [unowned self] (notification) in
try? self.setupAudio()
}
try? self.setupSession()
}
func setupSession() throws {
session.sessionPreset = .high
if !session.isRunning {
session.startRunning()
}
if Utils.checkPermissions() {
try setupInputs()
setupOutputs()
}
}
func setupInputs() throws {
try setupCamera()
try setupAudio()
}
func setupCamera() throws {
do {
try setCamera(position: Settings.shared.defaultCamera)
} catch CameraManagerError.unableToFindCaptureDevice(let position) {
//some devices don't have a front camera, so try the back for setup
if position == .front {
try setCamera(position: .back)
}
}
}
func setupAudio() throws {
if let audioInput = self.audioInput {
self.session.removeInput(audioInput)
}
guard let audioDevice = AVCaptureDevice.default(for: .audio) else {
throw CameraManagerError.unableToGetAudioDevice
}
let audioInput = try AVCaptureDeviceInput(device: audioDevice)
if session.canAddInput(audioInput) {
session.addInput(audioInput)
self.audioInput = audioInput
} else {
self.delegate?.unableToAddAudioInput()
}
}
func setupOutputs() {
self.photoOutput.isHighResolutionCaptureEnabled = true
guard session.canAddOutput(self.photoOutput) else {
//error
return
}
session.addOutput(self.photoOutput)
guard session.canAddOutput(self.videoOutput) else {
//error
return
}
session.addOutput(self.videoOutput)
}
func startRecording() throws {
if !self.videoOutput.isRecording {
let documentDirectory = try FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor:nil, create:false)
let url = documentDirectory.appendingPathComponent(UUID().uuidString + ".mov")
self.videoOutput.startRecording(to: url, recordingDelegate: self)
}
}
func stopRecording() {
if self.videoOutput.isRecording {
self.videoOutput.stopRecording()
}
}
func setZoomLevel(zoomLevel: CGFloat) throws {
guard let captureDevice = self.captureDeviceInput?.device else {
throw CameraManagerError.missingCaptureDevice
}
try captureDevice.lockForConfiguration()
captureDevice.videoZoomFactor = zoomLevel
captureDevice.unlockForConfiguration()
}
func capturePhoto() {
let photoOutputSettings = AVCapturePhotoSettings()
photoOutputSettings.flashMode = Settings.shared.flash
photoOutputSettings.isAutoStillImageStabilizationEnabled = true
photoOutputSettings.isHighResolutionPhotoEnabled = true
self.photoOutput.capturePhoto(with: photoOutputSettings, delegate: self)
}
func toggleCamera() throws {
if let captureDeviceInput = self.captureDeviceInput,
captureDeviceInput.device.position == .back {
try setCamera(position: .front)
} else {
try setCamera(position: .back)
}
}
func setCamera(position: AVCaptureDevice.Position) throws {
if let captureDeviceInput = self.captureDeviceInput {
if captureDeviceInput.device.position == position {
return
} else {
session.removeInput(captureDeviceInput)
}
}
var device: AVCaptureDevice? = nil
switch position {
case .front:
device = AVCaptureDevice.default(.builtInWideAngleCamera, for: .video, position: .front)
default:
device = AVCaptureDevice.default(for: .video)
}
guard let nonNilDevice = device else {
throw CameraManagerError.unableToFindCaptureDevice(position)
}
try nonNilDevice.lockForConfiguration()
if nonNilDevice.isFocusModeSupported(.continuousAutoFocus) {
nonNilDevice.focusMode = .continuousAutoFocus
}
if nonNilDevice.isExposureModeSupported(.continuousAutoExposure) {
nonNilDevice.exposureMode = .continuousAutoExposure
}
nonNilDevice.unlockForConfiguration()
let input = try AVCaptureDeviceInput(device: nonNilDevice)
guard session.canAddInput(input) else {
throw CameraManagerError.unableToAddCaptureDeviceInput
}
session.addInput(input)
self.captureDeviceInput = input
}
func setFocus(point: CGPoint) throws {
guard let device = self.captureDeviceInput?.device else {
throw CameraManagerError.missingCaptureDeviceInput
}
guard device.isFocusPointOfInterestSupported && device.isFocusModeSupported(.autoFocus) else {
throw CameraManagerError.notSupportedByDevice
}
try device.lockForConfiguration()
device.focusPointOfInterest = point
device.focusMode = .autoFocus
device.unlockForConfiguration()
}
func setExposure(point: CGPoint) throws {
guard let device = self.captureDeviceInput?.device else {
throw CameraManagerError.missingCaptureDeviceInput
}
guard device.isExposurePointOfInterestSupported && device.isExposureModeSupported(.autoExpose) else {
throw CameraManagerError.notSupportedByDevice
}
try device.lockForConfiguration()
device.exposurePointOfInterest = point
device.exposureMode = .autoExpose
device.unlockForConfiguration()
}
}
extension CameraManager: AVCapturePhotoCaptureDelegate {
func photoOutput(_ output: AVCapturePhotoOutput, willCapturePhotoFor resolvedSettings: AVCaptureResolvedPhotoSettings) {
self.delegate?.cameraManagerWillCapturePhoto()
}
func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {
guard let imageData = photo.fileDataRepresentation() else {
//error
return
}
let capturedImage = UIImage.init(data: imageData , scale: 1.0)
if let image = capturedImage {
UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil)
}
self.delegate?.cameraManagerDidFinishProcessingPhoto()
}
}
extension CameraManager: AVCaptureFileOutputRecordingDelegate {
func fileOutput(_ output: AVCaptureFileOutput, didStartRecordingTo fileURL: URL, from connections: [AVCaptureConnection]) {
self.delegate?.cameraManagerDidStartRecording()
}
func fileOutput(_ output: AVCaptureFileOutput, didFinishRecordingTo outputFileURL: URL, from connections: [AVCaptureConnection], error: Error?) {
self.delegate?.cameraManagerDidFinishRecording()
PHPhotoLibrary.shared().performChanges({
PHAssetChangeRequest.creationRequestForAssetFromVideo(atFileURL: outputFileURL)
}) { saved, error in
if saved {
do {
try FileManager.default.removeItem(at: outputFileURL)
} catch _ as NSError {
//error
}
}
}
}
}