iPhone 7+, ios 11.2: 当前配置不支持深度数据传输

Question

这个错误让我抓狂。我正在尝试生成绝对最小的代码，以使用 iPhone 7+ 的 DualCam 从 AVDepthData 获取 AVDepthData。

我有这个代码：


//
//  RecorderViewController.swift
//  ios-recorder-app


import UIKit
import AVFoundation


class RecorderViewController: UIViewController {

    @IBOutlet weak var previewView: UIView!

    @IBAction func onTapTakePhoto(_ sender: Any) {

        guard let capturePhotoOutput = self.capturePhotoOutput else { return }

        let photoSettings = AVCapturePhotoSettings()

        photoSettings.isDepthDataDeliveryEnabled = true //Error

        capturePhotoOutput.capturePhoto(with: photoSettings, delegate: self)

    }

    var session: AVCaptureSession?
    var videoPreviewLayer: AVCaptureVideoPreviewLayer?
    var capturePhotoOutput: AVCapturePhotoOutput?


    override func viewDidLoad() {
        super.viewDidLoad()

        AVCaptureDevice.requestAccess(for: .video, completionHandler: { _ in })

        let captureDevice = AVCaptureDevice.default(.builtInDualCamera, for: .depthData, position: .back)

        do {
            print(captureDevice!)
            let input = try AVCaptureDeviceInput(device: captureDevice!)

            self.capturePhotoOutput = AVCapturePhotoOutput()
            self.capturePhotoOutput?.isDepthDataDeliveryEnabled = true //Error

            self.session = AVCaptureSession()
            self.session?.addInput(input)

            self.videoPreviewLayer = AVCaptureVideoPreviewLayer(session: self.session!)
            self.videoPreviewLayer?.videoGravity = AVLayerVideoGravity.resizeAspectFill
            self.videoPreviewLayer?.frame = view.layer.bounds
            previewView.layer.addSublayer(self.videoPreviewLayer!)

            self.session?.addOutput(self.capturePhotoOutput!)
            self.session?.startRunning()

        } catch {
            print(error)
        }

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

}

extension RecorderViewController : AVCapturePhotoCaptureDelegate {

    func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {
        print(photo.depthData)

    }


}

如果我注释掉标有 "Error" 的行，代码将按我预期的方式工作，并为 depthData 打印 nil。

但是，保持原样，我得到一个异常。错误消息指出：AVCapturePhotoOutput setDepthDataDeliveryEnabled:] Depth data delivery is not supported in the current configuration.

如何更改 "current configuration" 以支持深度传送？

我看过这个视频：https://developer.apple.com/videos/play/wwdc2017/507/ 很有帮助，我相信我已经按照完成这项工作所需的确切步骤进行操作。

如有任何提示，我们将不胜感激！

Answer 1

有两件事我需要解决。

将sessionPreset设置为支持深度的格式，例如.photo。
在设置之前将 cameraPhotoOutput 添加到会话 .isDepthDataDeliveryEnabled = true。

这是我获取照片深度的最少代码：


//
//  RecorderViewController.swift
//  ios-recorder-app
//

import UIKit
import AVFoundation


class RecorderViewController: UIViewController {

    @IBOutlet weak var previewView: UIView!

    @IBAction func onTapTakePhoto(_ sender: Any) {

        guard var capturePhotoOutput = self.capturePhotoOutput else { return }

        var photoSettings = AVCapturePhotoSettings()
        photoSettings.isDepthDataDeliveryEnabled = true

        capturePhotoOutput.capturePhoto(with: photoSettings, delegate: self)

    }

    var session: AVCaptureSession?
    var videoPreviewLayer: AVCaptureVideoPreviewLayer?
    var capturePhotoOutput: AVCapturePhotoOutput?


    override func viewDidLoad() {
        super.viewDidLoad()

        AVCaptureDevice.requestAccess(for: .video, completionHandler: { _ in })

        let captureDevice = AVCaptureDevice.default(.builtInDualCamera, for: .video, position: .back)

        print(captureDevice!.activeDepthDataFormat)

        do{
            let input = try AVCaptureDeviceInput(device: captureDevice!)

            self.capturePhotoOutput = AVCapturePhotoOutput()

            self.session = AVCaptureSession()
            self.session?.beginConfiguration()
            self.session?.sessionPreset = .photo
            self.session?.addInput(input)

            self.videoPreviewLayer = AVCaptureVideoPreviewLayer(session: self.session!)
            self.videoPreviewLayer?.videoGravity = AVLayerVideoGravity.resizeAspectFill
            self.videoPreviewLayer?.frame = self.view.layer.bounds
            self.previewView.layer.addSublayer(self.videoPreviewLayer!)

            self.session?.addOutput(self.capturePhotoOutput!)
            self.session?.commitConfiguration()
            self.capturePhotoOutput?.isDepthDataDeliveryEnabled = true
            self.session?.startRunning()
        }
        catch{
            print(error)
        }

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

}

extension RecorderViewController : AVCapturePhotoCaptureDelegate {

    func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {
        print(photo.depthData)
    }


}

iPhone 7+, ios 11.2: 当前配置不支持深度数据传输

iPhone 7+, ios 11.2: Depth data delivery is not supported in the current configuration

ios

swift

avcapturesession

avcapturedevice

avcaptureoutput