I'm trying to record video, with audio input coming from a connected Bluetooth headset. However I haven't been able to get an AVCaptureDevice that represents the headset, so I can't add it to my AVCaptureSession.I tried to find it using a discovery session, but it never finds the headset-- only the built in microphone. That may not be surprising since I'm asking for .builtInMicrophone, but the enumeration has no members for external audio inputs. I tried leaving the device type array empty but that finds no devices.let discoverySession = AVCaptureDevice.DiscoverySession(deviceTypes: [.builtInMicrophone], mediaType: AVMediaType.audio, position: .unspecified) print("Found \(discoverySession.devices.count) devices") for device in discoverySession.devices { print("Device: \(device)") }After doing some searching I tried setting up the AVAudioSession to specifically allow Bluetooth. However this has had no effect on the above.private let session = AVCaptureSession() // later... session.usesApplicationAudioSession = true session.automaticallyConfiguresApplicationAudioSession = false do { try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayAndRecord, with: [.allowBluetooth]) try AVAudioSession.sharedInstance().setActive(true) } catch { print("Error messing with audio session: \(error)") }For completeness I also tried the deprecated AVCaptureDevice.devices() method, but it doesn't find the Bluetooth headset either.I know that the headset is available because AVAudioSession can see it. However I haven't been able to get from the availableInputs array to something I can use in an AVCaptureSession. The following code finds the headset, but what would I do with the result? It's not an AVCaptureDevice nor can I construct one from the entries in the array. Setting the "preferred" input doesn't have any effect that I know how to use.if let availableInputs = AVAudioSession.sharedInstance().availableInputs { print("Found \(availableInputs.count) inputs") for input in availableInputs { print("Input: \(input)") if input.portType == AVAudioSessionPortBluetoothHFP { print("Setting preferred input") do { try AVAudioSession.sharedInstance().setPreferredInput(input) } catch { print("Error setting preferred input: \(error)") } } } }Given that the Bluetooth headset is connected and available, how do I set it as the audio input for my capture session?

HiI'm using Swift 4 and the AvCam example code from Apple. In my own app I've an issue where the captured image orientation is wrong. My requirement is to save the photos to my applications folder as opposed to the Photos library. I've spent a day trying to correct my own code and got nowhere.As a test I modified the AvCam code to write the photo data to a static variable in a struct and then display that image on the camera view in AvCam by tapping a button as follows:// In the camera view controller: @IBOutlet weak var pv: UIImageView! // for previewing test @IBAction func btn(_ sender: UIButton) { // for setting preview test image let dataProvider = CGDataProvider(data: photoTest.photo! as CFData) let cgImageRef: CGImage! = CGImage(jpegDataProviderSource: dataProvider!, decode: nil, shouldInterpolate: true, intent: .defaultIntent) let photo = UIImage(cgImage: cgImageRef) pv.contentMode = .scaleAspectFill pv.image = photo }The orientaion issue is replicated in AvCam with the above code. In my own app the image is previewed before saving to the apps folder and the images orientation is always wrong in the preview as well as when reloading the image from disk. I.e. if the iphone is in portrait orientation, the preview image is rotated 90 degrees anti-clockwise, in landscape the same happens so the preview image appears to be the correct way up.I'm assuming I've completely missed the point somewhere along the line as it seems to me that regardless of device orientation, the top of a photo should always be the top. For example, in the Photos app photos are shown the correct way up regardless of orientation.Any help would be much appreciated, this is driving me nuts ;o)Cheers