在Swiftui / avfoundation / avcapturedeviceinput中遇到麻烦

Question

我正在使用Avfoundation对Swiftui进行编码，并能够根据预期工作。 我遇到了一个错误，在翻转后，它将变成黑屏

但是，由于我正在实施翻转摄像机功能，因此 我的代码

class CameraViewModel: NSObject,ObservableObject,AVCaptureFileOutputRecordingDelegate, AVCapturePhotoCaptureDelegate{

 ... 
    @Published var session = AVCaptureSession()

 @objc dynamic var videoDeviceInput: AVCaptureDeviceInput!
    private let sessionQueue = DispatchQueue(label: "session queue")

 func setUp(){
        
        do{
            self.session.beginConfiguration()
            let cameraDevice = AVCaptureDevice.default(.builtInWideAngleCamera, for: .video, position: .front)
            let videoInput = try AVCaptureDeviceInput(device: cameraDevice!)
            let audioDevice = AVCaptureDevice.default(for: .audio)
            let audioInput = try AVCaptureDeviceInput(device: audioDevice!)
            
            // MARK: Audio Input
            
            if self.session.canAddInput(videoInput) && self.session.canAddInput(audioInput){
                self.session.addInput(videoInput)
                self.session.addInput(audioInput)
              self.videoDeviceInput = videoInput
            }

            if self.session.canAddOutput(self.output){
                self.session.addOutput(self.output)
            }
            if self.session.canAddOutput(self.photoOutput){
                self.session.addOutput(self.photoOutput)
            }
            
            self.session.commitConfiguration()
        }
        catch{
            print(error.localizedDescription)
        }
    }
  
    func changeCamera() {
      sessionQueue.async {
          if self.videoDeviceInput != nil {
              let currentVideoDevice = self.videoDeviceInput.device
              let currentPosition = currentVideoDevice.position
              
              let preferredPosition: AVCaptureDevice.Position
              
              switch currentPosition {
              case .unspecified, .front:
                  preferredPosition = .back
                  
              case .back:
                  preferredPosition = .front
                  
              @unknown default:
                  print("Unknown capture position. Defaulting to back, dual-camera.")
                  preferredPosition = .back
              }
            
            print("current pos is \(currentPosition.rawValue) and preferred position is \(preferredPosition.rawValue)")
              do{
                  self.session.beginConfiguration()
                
                //remove device as needed
                self.session.removeInput(self.videoDeviceInput)
                
                let newCameraDevice = AVCaptureDevice.default(.builtInWideAngleCamera, for: .video, position: preferredPosition)
                let newVideoInput = try AVCaptureDeviceInput(device: newCameraDevice!)
                let newAudioDevice = AVCaptureDevice.default(for: .audio)
                let newAudioInput = try AVCaptureDeviceInput(device: newAudioDevice!)
                
                // MARK: Audio Input
                
                if self.session.canAddInput(newVideoInput) && self.session.canAddInput(newAudioInput){
                    self.session.addInput(newVideoInput)
                    self.session.addInput(newAudioInput)
                  self.videoDeviceInput = newVideoInput
                }

                
                self.session.commitConfiguration()
                
              }catch{
                print(error.localizedDescription)
              }
          }
      }

    }
}

我不确定我在做什么错，因为我已经查找了以前的堆栈溢出线程和在线资源，他们所说的就是获取设备输入位置并更改该位置，然后在进行配置之前将其删除。任何帮助将不胜感激！

编辑：我发现解决方案是摆脱音频输入代码，因为没有它的音频仍在捕获

Answer 1

问题在于您未显示的代码中。

当您在SwiftUI视图中显示图像时，方向取决于二手相机。

对于前摄像头，它是.upmrored。

如果切换到使用后相机，则需要使用.up。