使用 avfoundation 录制视频并将其保存到照片库 ~ Swift 5

Question

我下面的 swift 代码使用 avfoundation 拍摄照片并将其放在一个类中的 imageview 上。我想将此代码用作基础，并且仅当用户调用 func startVideo 进行录制时，然后当用户调用 saveVideo func 时，它会停止录制并将其保存到 imageivew 中。

import UIKit
import AVFoundation

class ViewController: UIViewController {

var captureSession = AVCaptureSession()
var backCamera: AVCaptureDevice?
var frontCamera: AVCaptureDevice?
var currentCamera: AVCaptureDevice?
var photoOutput: AVCapturePhotoOutput?

var cameraPreviewLayer: AVCaptureVideoPreviewLayer?
var image: UIImage?

override func viewDidLoad() {
    super.viewDidLoad()

    setupCaptureSession()
    setupDevice()
    setupInputOutput()
    setupPreviewLayer()
    startRunningCaptureSession()

    // Do any additional setup after loading the view, typically from a nib.
}

func setupCaptureSession () {
    captureSession.sessionPreset = AVCaptureSession.Preset.photo
}

 func setupDevice() {
    let deviceDiscoverySession = AVCaptureDevice.DiscoverySession(deviceTypes: [AVCaptureDevice.DeviceType.builtInWideAngleCamera], mediaType: AVMediaType.video, position: AVCaptureDevice.Position.unspecified)

    let devices = deviceDiscoverySession.devices

    for device in devices {
        if device.position == AVCaptureDevice.Position.back {
            backCamera = device
        } else if device.position == AVCaptureDevice.Position.front {
            frontCamera = device

        }
    }

    currentCamera = backCamera


}

func setupInputOutput() {
    do {
        let captureDeviceInput = try AVCaptureDeviceInput(device: currentCamera!)
        captureSession.addInput(captureDeviceInput)
        photoOutput = AVCapturePhotoOutput()
        photoOutput?.setPreparedPhotoSettingsArray([AVCapturePhotoSettings(format: [AVVideoCodecKey: AVVideoCodecType.jpeg])], completionHandler: nil)

        captureSession.addOutput(photoOutput!)

    } catch {
        print(error)
    }


}

func setupPreviewLayer () {

    cameraPreviewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
    cameraPreviewLayer?.videoGravity = AVLayerVideoGravity.resizeAspectFill
    cameraPreviewLayer?.connection?.videoOrientation = AVCaptureVideoOrientation.portrait
    cameraPreviewLayer?.frame = self.view.frame
    self.view.layer.insertSublayer(cameraPreviewLayer!, at: 0)





}
func startRunningCaptureSession () {
    captureSession.startRunning()
}





@IBAction func startVideo(_ sender: Any) {

}


    @IBOutlet weak var photo: UIImageView!




    @IBAction func saveVideo(_ sender: Any) {


    }}

     extension ViewController: AVCapturePhotoCaptureDelegate {
 func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {
    //contains the photo variable
    if let imageData = photo.fileDataRepresentation() {
        print(imageData)
        image = UIImage(data: imageData)



    }

}}

Answer 1

您可以通过创建AVCaptureMovieFileOutput 并将其添加到您的捕获会话，并使您的ViewController 符合AVCaptureFileOutputRecordingDelegate 来将录制的视频保存到文件中。

此示例将 5 秒的视频录制到应用程序的 Documents 目录中名为“output.mov”的文件中。

class ViewController: UIViewController, AVCaptureFileOutputRecordingDelegate {

    var captureSession = AVCaptureSession()
    var sessionOutput = AVCaptureStillImageOutput()
    var movieOutput = AVCaptureMovieFileOutput()
    var previewLayer = AVCaptureVideoPreviewLayer()

    @IBOutlet var cameraView: UIView!

    override func viewWillAppear(animated: Bool) {
        self.cameraView = self.view

        let devices = AVCaptureDevice.devicesWithMediaType(AVMediaTypeVideo)
        for device in devices {
            if device.position == AVCaptureDevicePosition.Front{


                do{

                    let input = try AVCaptureDeviceInput(device: device as! AVCaptureDevice)

                    if captureSession.canAddInput(input){

                        captureSession.addInput(input)
                        sessionOutput.outputSettings = [AVVideoCodecKey : AVVideoCodecJPEG]

                        if captureSession.canAddOutput(sessionOutput){

                            captureSession.addOutput(sessionOutput)

                            previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
                            previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
                            previewLayer.connection.videoOrientation = AVCaptureVideoOrientation.Portrait
                            cameraView.layer.addSublayer(previewLayer)

                            previewLayer.position = CGPoint(x: self.cameraView.frame.width / 2, y: self.cameraView.frame.height / 2)
                            previewLayer.bounds = cameraView.frame


                        }

                        captureSession.addOutput(movieOutput)

                        captureSession.startRunning()

                        let paths = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)
                        let fileUrl = paths[0].URLByAppendingPathComponent("output.mov")
                        try? NSFileManager.defaultManager().removeItemAtURL(fileUrl)
                        movieOutput.startRecordingToOutputFileURL(fileUrl, recordingDelegate: self)

                        let delayTime = dispatch_time(DISPATCH_TIME_NOW, Int64(5 * Double(NSEC_PER_SEC)))
                        dispatch_after(delayTime, dispatch_get_main_queue()) {
                            print("stopping")
                            self.movieOutput.stopRecording()
                        }
                    }

                }
                catch{

                    print("Error")
                }

            }
        }

    }

    func captureOutput(captureOutput: AVCaptureFileOutput!, didFinishRecordingToOutputFileAtURL outputFileURL: NSURL!, fromConnections connections: [AnyObject]!, error: NSError!) {
        print("FINISHED \(error)")
        // save video to camera roll
        if error == nil {
            UISaveVideoAtPathToSavedPhotosAlbum(outputFileURL.path!, nil, nil, nil)
        }
    }

}