如何使用AVCapturePhotoOutput

Question

我一直在使用自定义相机,最近我和Swift 3一起升级到Xcode 8 beta.我原来是这样的:

var stillImageOutput: AVCaptureStillImageOutput?

但是,我现在收到警告:

在iOS 10.0中不推荐使用'AVCaptureStillImageOutput':改用AVCapturePhotoOutput

由于这是相当新的,我没有看到很多关于此的信息.这是我目前的代码:

var captureSession: AVCaptureSession?
var stillImageOutput: AVCaptureStillImageOutput?
var previewLayer: AVCaptureVideoPreviewLayer?

func clickPicture() {

    if let videoConnection = stillImageOutput?.connection(withMediaType: AVMediaTypeVideo) {

        videoConnection.videoOrientation = .portrait
        stillImageOutput?.captureStillImageAsynchronously(from: videoConnection, completionHandler: { (sampleBuffer, error) -> Void in

            if sampleBuffer != nil {

                let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(sampleBuffer)
                let dataProvider = CGDataProvider(data: imageData!)
                let cgImageRef = CGImage(jpegDataProviderSource: dataProvider!, decode: nil, shouldInterpolate: true, intent: .defaultIntent)

                let image = UIImage(cgImage: cgImageRef!, scale: 1, orientation: .right)

            }

        })

    }

}

我试着看一下AVCapturePhotoCaptureDelegate,但我不太清楚如何使用它.有谁知道如何使用它？谢谢.

Answer 1

已更新至Swift 4 嗨,它非常易于使用AVCapturePhotoOutput.

你需要AVCapturePhotoCaptureDelegate返回的 CMSampleBuffer.

如果您告诉AVCapturePhotoSettingspreviewFormat,您还可以获得预览图像

    class CameraCaptureOutput: NSObject, AVCapturePhotoCaptureDelegate {

        let cameraOutput = AVCapturePhotoOutput()

        func capturePhoto() {

          let settings = AVCapturePhotoSettings()
          let previewPixelType = settings.availablePreviewPhotoPixelFormatTypes.first!
          let previewFormat = [kCVPixelBufferPixelFormatTypeKey as String: previewPixelType,
                               kCVPixelBufferWidthKey as String: 160,
                               kCVPixelBufferHeightKey as String: 160]
          settings.previewPhotoFormat = previewFormat
          self.cameraOutput.capturePhoto(with: settings, delegate: self)

        }

func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photoSampleBuffer: CMSampleBuffer?, previewPhoto previewPhotoSampleBuffer: CMSampleBuffer?, resolvedSettings: AVCaptureResolvedPhotoSettings, bracketSettings: AVCaptureBracketedStillImageSettings?, error: Error?) {                        
            if let error = error {
                print(error.localizedDescription)
            }

            if let sampleBuffer = photoSampleBuffer, let previewBuffer = previewPhotoSampleBuffer, let dataImage = AVCapturePhotoOutput.jpegPhotoDataRepresentation(forJPEGSampleBuffer: sampleBuffer, previewPhotoSampleBuffer: previewBuffer) {
              print("image: \(UIImage(data: dataImage)?.size)") // Your Image
            }   
        }
    }

有关更多信息,请访问https://developer.apple.com/reference/AVFoundation/AVCapturePhotoOutput

注意:您必须在拍摄之前添加AVCapturePhotoOutput到AVCaptureSession之前.所以类似于:session.addOutput(output)然后:output.capturePhoto(with:settings, delegate:self)谢谢@BigHeadCreations

Answer 2

我有完整的实施

import UIKit
import AVFoundation

class ViewController: UIViewController, AVCapturePhotoCaptureDelegate {

var captureSesssion : AVCaptureSession!
var cameraOutput : AVCapturePhotoOutput!
var previewLayer : AVCaptureVideoPreviewLayer!

@IBOutlet weak var capturedImage: UIImageView!
@IBOutlet weak var previewView: UIView!

override func viewDidLoad() {
    super.viewDidLoad()
    captureSesssion = AVCaptureSession()
    captureSesssion.sessionPreset = AVCaptureSessionPresetPhoto
    cameraOutput = AVCapturePhotoOutput()

    let device = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)

    if let input = try? AVCaptureDeviceInput(device: device) {
        if (captureSesssion.canAddInput(input)) {
            captureSesssion.addInput(input)
            if (captureSesssion.canAddOutput(cameraOutput)) {
                captureSesssion.addOutput(cameraOutput)
                previewLayer = AVCaptureVideoPreviewLayer(session: captureSesssion)
                previewLayer.frame = previewView.bounds
                previewView.layer.addSublayer(previewLayer)
                captureSesssion.startRunning()
            }
        } else {
            print("issue here : captureSesssion.canAddInput")
        }
    } else {
        print("some problem here")
    }
}

// Take picture button
@IBAction func didPressTakePhoto(_ sender: UIButton) {
    let settings = AVCapturePhotoSettings()
    let previewPixelType = settings.availablePreviewPhotoPixelFormatTypes.first!
    let previewFormat = [
         kCVPixelBufferPixelFormatTypeKey as String: previewPixelType,
         kCVPixelBufferWidthKey as String: 160,
         kCVPixelBufferHeightKey as String: 160
    ]
    settings.previewPhotoFormat = previewFormat
    cameraOutput.capturePhoto(with: settings, delegate: self)
}

// callBack from take picture
func capture(_ captureOutput: AVCapturePhotoOutput, didFinishProcessingPhotoSampleBuffer photoSampleBuffer: CMSampleBuffer?, previewPhotoSampleBuffer: CMSampleBuffer?, resolvedSettings: AVCaptureResolvedPhotoSettings, bracketSettings: AVCaptureBracketedStillImageSettings?, error: Error?) {

    if let error = error {
        print("error occure : \(error.localizedDescription)")
    }

    if  let sampleBuffer = photoSampleBuffer,
        let previewBuffer = previewPhotoSampleBuffer,
        let dataImage =  AVCapturePhotoOutput.jpegPhotoDataRepresentation(forJPEGSampleBuffer:  sampleBuffer, previewPhotoSampleBuffer: previewBuffer) {
        print(UIImage(data: dataImage)?.size as Any)

        let dataProvider = CGDataProvider(data: dataImage as CFData)
        let cgImageRef: CGImage! = CGImage(jpegDataProviderSource: dataProvider!, decode: nil, shouldInterpolate: true, intent: .defaultIntent)
        let image = UIImage(cgImage: cgImageRef, scale: 1.0, orientation: UIImageOrientation.right)

        self.capturedImage.image = image
    } else {
        print("some error here")
    }
}

// This method you can use somewhere you need to know camera permission   state
func askPermission() {
    print("here")
    let cameraPermissionStatus =  AVCaptureDevice.authorizationStatus(forMediaType: AVMediaTypeVideo)

    switch cameraPermissionStatus {
    case .authorized:
        print("Already Authorized")
    case .denied:
        print("denied")

        let alert = UIAlertController(title: "Sorry :(" , message: "But  could you please grant permission for camera within device settings",  preferredStyle: .alert)
        let action = UIAlertAction(title: "Ok", style: .cancel,  handler: nil)
        alert.addAction(action)
        present(alert, animated: true, completion: nil)

    case .restricted:
        print("restricted")
    default:
        AVCaptureDevice.requestAccess(forMediaType: AVMediaTypeVideo, completionHandler: {
            [weak self]
            (granted :Bool) -> Void in

            if granted == true {
                // User granted
                print("User granted")
 DispatchQueue.main.async(){
            //Do smth that you need in main thread   
            } 
            }
            else {
                // User Rejected
                print("User Rejected")

DispatchQueue.main.async(){
            let alert = UIAlertController(title: "WHY?" , message:  "Camera it is the main feature of our application", preferredStyle: .alert)
                let action = UIAlertAction(title: "Ok", style: .cancel, handler: nil)
                alert.addAction(action)
                self?.present(alert, animated: true, completion: nil)  
            } 
            }
        });
    }
}
}

Answer 3

我接受了@Aleksey Timoshchenko的出色回答，并将其更新为Swift 4.x。

请注意，对于我的用例，我允许用户拍摄多张照片，这就是为什么将它们保存在images阵列中的原因。

请注意，您需要@IBAction takePhoto通过storyboard或在代码中连接该方法。就我而言，我使用storyboard。

由于iOS 11中，AVCapturePhotoOutput.jpegPhotoDataRepresentation即在使用@Aleksey Timoshchenko的答案被弃用。

斯威夫特4.x

class CameraVC: UIViewController {

    @IBOutlet weak var cameraView: UIView!

    var images = [UIImage]()

    var captureSession: AVCaptureSession!
    var cameraOutput: AVCapturePhotoOutput!
    var previewLayer: AVCaptureVideoPreviewLayer!

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        startCamera()
    }

    func startCamera() {
        captureSession = AVCaptureSession()
        captureSession.sessionPreset = AVCaptureSession.Preset.photo
        cameraOutput = AVCapturePhotoOutput()

        if let device = AVCaptureDevice.default(for: .video),
           let input = try? AVCaptureDeviceInput(device: device) {
            if (captureSession.canAddInput(input)) {
                captureSession.addInput(input)
                if (captureSession.canAddOutput(cameraOutput)) {
                    captureSession.addOutput(cameraOutput)
                    previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
                    previewLayer.frame = cameraView.bounds
                    cameraView.layer.addSublayer(previewLayer)
                    captureSession.startRunning()
                }
            } else {
                print("issue here : captureSesssion.canAddInput")
            }
        } else {
            print("some problem here")
        }
    }

    @IBAction func takePhoto(_ sender: UITapGestureRecognizer) {
        let settings = AVCapturePhotoSettings()
        let previewPixelType = settings.availablePreviewPhotoPixelFormatTypes.first!
        let previewFormat = [
            kCVPixelBufferPixelFormatTypeKey as String: previewPixelType,
            kCVPixelBufferWidthKey as String: 160,
            kCVPixelBufferHeightKey as String: 160
        ]
        settings.previewPhotoFormat = previewFormat
        cameraOutput.capturePhoto(with: settings, delegate: self)   
    }
}

extension CameraVC : AVCapturePhotoCaptureDelegate {
    func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {

        if let error = error {
            print("error occured : \(error.localizedDescription)")
        }

        if let dataImage = photo.fileDataRepresentation() {
            print(UIImage(data: dataImage)?.size as Any)

            let dataProvider = CGDataProvider(data: dataImage as CFData)
            let cgImageRef: CGImage! = CGImage(jpegDataProviderSource: dataProvider!, decode: nil, shouldInterpolate: true, intent: .defaultIntent)
            let image = UIImage(cgImage: cgImageRef, scale: 1.0, orientation: UIImage.Orientation.right)

            /**
               save image in array / do whatever you want to do with the image here
            */
            self.images.append(image)

        } else {
            print("some error here")
        }
    }
}

Answer 4

在iOS 11中"photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photoSampleBuffer: CMSampleBuffer?, previewPhoto previewPhotoSampleBuffer: CMSampleBuffer?, resolvedSettings: AVCaptureResolvedPhotoSettings, bracketSettings: AVCaptureBracketedStillImageSettings?, error: Error?) {}" is deprecated。

使用以下方法：

func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {
    let imageData = photo.fileDataRepresentation()
    if let data = imageData, let img = UIImage(data: data) {
        print(img)
    }
}