AVFoundation 框架

作者: 小凡凡520 | 来源:发表于2020-02-12 14:04 被阅读0次

一、视频播放

AVPlayerViewController

import UIKit
import AVKit

class HHViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        
        if let path = Bundle.main.path(forResource: "", ofType: "") {
            let url = URL(fileURLWithPath: path)
            let vc = AVPlayerViewController()
            vc.player = AVPlayer(url: url)
            self.present(vc, animated: true) {
                    vc.player?.play()
            }
        }
    }
}

// 界面自定义

import UIKit
import AVKit

class HHViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        
        if let path = Bundle.main.path(forResource: "", ofType: "") {
            let url = URL(fileURLWithPath: path)
            let player = AVPlayer(url: url)
            let layer = AVPlayerLayer(player: player)
            layer.frame = self.view.frame
            self.view.layer.addSublayer(layer)
            
            player.play()
        }
    }
}

二、视频录制

import UIKit
import AVFoundation

class TestViewController: UIViewController,AVCaptureFileOutputRecordingDelegate {
    
    @IBOutlet weak var imageView: UIImageView!
    
    private var session:AVCaptureSession!
    
    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }
    
    @IBAction func end(_ sender: Any) {
        session!.stopRunning()
    }
    
    @IBAction func test(_ sender: Any) {
         // 预览图层和视频方向保持一致,这个属性设置很重要，如果不设置，那么出来的视频图像可以是倒向左边的。
//         captureConnection.videoOrientation=[self.captureVideoPreviewLayer connection].videoOrientation;
        
        session = AVCaptureSession()
        
        guard let videoDevice = AVCaptureDevice.default(for: .video) else {
            return
        }
        guard let audioDevice = AVCaptureDevice.default(for: .audio) else {
            return
        }
        let videoInput = try! AVCaptureDeviceInput(device: videoDevice)
        let audioInput = try! AVCaptureDeviceInput(device: audioDevice)
        let videoOutPut = AVCaptureMovieFileOutput()
        
        if session.canAddInput(videoInput) {
            session.addInput(videoInput)
        }
        if session.canAddInput(audioInput) {
            session.addInput(audioInput)
        }
        if session.canAddOutput(videoOutPut) {
            session.addOutput(videoOutPut)
        }
        
        // 设置视频输出的文件路径，这里设置为 temp 文件
        let outputFielPath = (NSHomeDirectory() as! NSString).appending("/Documents/1.mp4")
        if FileManager.default.fileExists(atPath: outputFielPath) {
            try! FileManager.default.removeItem(atPath: outputFielPath)
        }
        if FileManager.default.createFile(atPath: outputFielPath, contents: nil, attributes: nil) {
            print("ok")
        }
        
        
        let previewLayer = AVCaptureVideoPreviewLayer(session: session)
        previewLayer.frame = self.view.bounds
        self.view.layer.addSublayer(previewLayer)

        session.startRunning()
        
        // 路径转换成 URL 要用这个方法，用 NSBundle 方法转换成 URL 的话可能会出现读取不到路径的错误
        let fileUrl = URL(fileURLWithPath: outputFielPath)
        // 往路径的 URL 开始写入录像 Buffer ,边录边写
        videoOutPut.startRecording(to: fileUrl, recordingDelegate: self)
    }
    
    func fileOutput(_ output: AVCaptureFileOutput, didStartRecordingTo fileURL: URL, from connections: [AVCaptureConnection]) {
        print("didStartRecordingTo")
    }
    
    func fileOutput(_ output: AVCaptureFileOutput, didFinishRecordingTo outputFileURL: URL, from connections: [AVCaptureConnection], error: Error?) {
        print("didFinishRecordingTo")
    }
}

三、生成视频缩略图

AVURLAsset
该类是AVAsset的子类,AVAsset类专门用于获取多媒体的相关信息,包括获取多媒体的画面、声音等信息。而AVURLAsset子类的作用则是根据NSURL来初始化AVAsset对象。
AVAssetImageGenerator
该类专门用于截取视频指定帧的画面。

import UIKit
import AVFoundation

class HHViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        
        
    }
    
    func imageWithVideo(vidoURL:URL) ->UIImage? {
        
        var thumb:UIImage?
        
        // 根据视频的URL创建AVURLAsset
        let asset = AVURLAsset(url: vidoURL)
        // 根据AVURLAsset创建AVAssetImageGenerator对象
        let gen = AVAssetImageGenerator(asset: asset)
        gen.appliesPreferredTrackTransform = true
         // 定义获取0帧处的视频截图
        let time = CMTimeMake(value: 0, timescale: 10)
        var actualTime: CMTime = CMTimeMake(value: 0, timescale: 0)
        do {
            // 获取time处的视频截图
            let image = try gen.copyCGImage(at: time, actualTime: &actualTime)
            // 将CGImageRef转换为UIImage
            thumb = UIImage(cgImage: image)
        } catch {}
        
        return thumb
    }
}

四、自定义相机

import UIKit
import AVFoundation

class TestViewController: UIViewController {
    
    @IBOutlet weak var imageView: UIImageView!
        
    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }
    
    @IBAction func end(_ sender: Any) {
        
    }
    
    @IBAction func test(_ sender: Any) {
        
        // 创建session(捕捉会话)
        let captureSession = AVCaptureSession()
        captureSession.canSetSessionPreset(.photo)
        
        // 输入
        guard let videoDevice = AVCaptureDevice.default(for: .video) else {
            return
        }
        do {
            // 视频输入
            let videoInput = try AVCaptureDeviceInput(device: videoDevice)
            
            if captureSession.canAddInput(videoInput) {
                captureSession.addInput(videoInput)
            }
            
            // 创建image output
            let imageOutput = AVCaptureStillImageOutput()
            
            imageOutput.outputSettings = [
                AVVideoCodecKey:AVVideoCodecJPEG
            ]
            if captureSession.canAddOutput(imageOutput) {
                captureSession.addOutput(imageOutput)
            }
            
            let previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
            previewLayer.frame = self.view.bounds
            self.view.layer.addSublayer(previewLayer)
            
            captureSession.startRunning()
            
            DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 1) {
                
                // 输出图片
                if let connect = imageOutput.connection(with: .video) {
                    imageOutput.captureStillImageAsynchronously(from: connect) { (sampleBuffer, error) in
                        if sampleBuffer != nil {
                            if let data = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(sampleBuffer!) {
                                DispatchQueue.main.async {
                                    self.imageView.image =  UIImage(data: data)
                                    previewLayer.removeFromSuperlayer()
                                }
                            }
                        }
                    }
                }
            }
        } catch {}
    }
}

五、回放

六、编辑

七、顺序播放多个音频

八、音频

import UIKit
import AVFoundation

class HHViewController: UIViewController,AVCaptureAudioDataOutputSampleBufferDelegate {

    private var previewLayer:AVCaptureVideoPreviewLayer?
    
    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        
        // 创建session(捕捉会话)
        let captureSession = AVCaptureSession()
        captureSession.canSetSessionPreset(.photo)
        
        // 输入
        if let videoDevice = AVCaptureDevice.default(for: .video),let audioDevice = AVCaptureDevice.default(for: .audio) {
            do {
                // 音频输入
                let audioIn = try AVCaptureDeviceInput(device: audioDevice)
                if captureSession.canAddInput(audioIn) {
                    captureSession.addInput(audioIn)
                }
                
                let audioOut = AVCaptureAudioDataOutput()
                audioOut.setSampleBufferDelegate(self, queue: DispatchQueue.main)
                
                if captureSession.canAddOutput(audioOut) {
                    captureSession.addOutput(audioOut)
                }
                
                // 设置音频捕捉连接
                audioOut.connection(with: .audio)
            } catch {}
        }
    }
    
    func captureOutput(_ output: AVCaptureOutput, didOutput sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection) {
        
    }
}

九、视频

import UIKit
import AVFoundation

class HHViewController: UIViewController,AVCaptureVideoDataOutputSampleBufferDelegate {

    private var previewLayer:AVCaptureVideoPreviewLayer?
    
    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        
        // 创建session(捕捉会话)
        let captureSession = AVCaptureSession()
        captureSession.canSetSessionPreset(.photo)
        
        // 输入
        if let videoDevice = AVCaptureDevice.default(for: .video),let audioDevice = AVCaptureDevice.default(for: .audio) {
            do {
                let videoIn = try AVCaptureDeviceInput(device: videoDevice)
                if captureSession.canAddInput(videoIn) {
                    captureSession.addInput(videoIn)
                }
                
                let videoOut = AVCaptureVideoDataOutput()
                videoOut.alwaysDiscardsLateVideoFrames = true
                videoOut.setSampleBufferDelegate(self, queue: DispatchQueue.main)
                if captureSession.canAddOutput(videoOut) {
                    captureSession.addOutput(videoOut)
                }
            } catch {}
        }
    }
    
    func captureOutput(_ output: AVCaptureOutput, didOutput sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection) {
        
    }
}

十、操作相机

import UIKit
import AVFoundation

class HHViewController: UIViewController,AVCaptureVideoDataOutputSampleBufferDelegate {

    private var previewLayer:AVCaptureVideoPreviewLayer?
    
    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        
        // 创建session(捕捉会话)
        let captureSession = AVCaptureSession()
        captureSession.canSetSessionPreset(.photo)
        
        // 输入
        if let videoDevice = AVCaptureDevice.default(for: .video),let audioDevice = AVCaptureDevice.default(for: .audio) {
            do {
                let videoIn = try AVCaptureDeviceInput(device: videoDevice)
                if captureSession.canAddInput(videoIn) {
                    captureSession.addInput(videoIn)
                }
                
                let videoOut = AVCaptureVideoDataOutput()
                videoOut.alwaysDiscardsLateVideoFrames = true
                videoOut.setSampleBufferDelegate(self, queue: DispatchQueue.main)
                if captureSession.canAddOutput(videoOut) {
                    captureSession.addOutput(videoOut)
                }
                
                guard let backDevice = change() else {
                    return
                }
                let newVideoIn = try AVCaptureDeviceInput(device: backDevice)
                captureSession.beginConfiguration()
                captureSession.removeInput(videoIn)
                if captureSession.canAddInput(newVideoIn) {
                    captureSession.addInput(newVideoIn)
                }
                captureSession.commitConfiguration()
            } catch {}
        }
    }
    
    func captureOutput(_ output: AVCaptureOutput, didOutput sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection) {
        
    }
    
    func change() -> AVCaptureDevice? {
        let devices = AVCaptureDevice.devices(for: .video)
        for device in devices {
            if device.position == .back {
                return device
            }
        }
        return nil
    }
}

十一、补光

十二、二维码识别

import UIKit
import AVFoundation

class TestViewController: UIViewController,AVCaptureMetadataOutputObjectsDelegate {
    
    private var session:AVCaptureSession!
    
    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        
    }
    
    @IBAction func end(_ sender: Any) {
        session.stopRunning()
    }
    
    @IBAction func test(_ sender: Any) {
        
        //session
        session = AVCaptureSession()
        
        //device
        guard let device = AVCaptureDevice.default(for: .video) else {
            return
        }
        //input
        let input = try! AVCaptureDeviceInput(device: device)
        if session.canAddInput(input) {
            session.addInput(input)
        }
        
        //output
        let output = AVCaptureMetadataOutput()
        if session.canAddOutput(output) {
            session.addOutput(output)
        }
        output.metadataObjectTypes = [.qr]
        output.setMetadataObjectsDelegate(self, queue: DispatchQueue.main)
        //add preview layer
        let previewLayer = AVCaptureVideoPreviewLayer(session: session)
        previewLayer.frame = self.view.bounds
        self.view.layer.addSublayer(previewLayer)
        //start
        session.startRunning()
    }
    
    func metadataOutput(_ output: AVCaptureMetadataOutput, didOutput metadataObjects: [AVMetadataObject], from connection: AVCaptureConnection) {
        
        for metadata in metadataObjects {
            if metadata.type == .qr {
                if let obj = metadata as? AVMetadataMachineReadableCodeObject {
                    print(obj.stringValue)
                }
            }
        }
    }
}

十三、直播

import UIKit
import AVFoundation

class TestViewController: UIViewController,AVCaptureVideoDataOutputSampleBufferDelegate {
    
    private var session:AVCaptureSession!
    @IBOutlet weak var imageView: UIImageView!
    
    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        
        imageView.transform = CGAffineTransform(rotationAngle: CGFloat(M_PI_2))
    }
    
    @IBAction func end(_ sender: Any) {
        session.stopRunning()
    }
    
    @IBAction func test(_ sender: Any) {
        
        //默认前摄像头输入
        guard let frontDevice = AVCaptureDevice.default(for: .video) else {
            return
        }
        let frontCameraInput = try! AVCaptureDeviceInput(device: frontDevice)
        
        //音视频输出
        let videoOutput = AVCaptureVideoDataOutput()
        videoOutput.setSampleBufferDelegate(self, queue: DispatchQueue.main)
        //视频输出的设置
        let setcapSettings = [
            kCVPixelBufferPixelFormatTypeKey:NSNumber(value: kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange)
        ]
        videoOutput.videoSettings = setcapSettings as [String : Any]
        
        session = AVCaptureSession()
        session.sessionPreset = .hd1280x720
        //添加设备
        if session.canAddInput(frontCameraInput) {
            session.addInput(frontCameraInput)
        }
        if session.canAddOutput(videoOutput) {
            session.addOutput(videoOutput)
        }
        
        //捕获view
        let previewLayer = AVCaptureVideoPreviewLayer(session: session)
        previewLayer.videoGravity = .resizeAspectFill
        previewLayer.frame = CGRect(x: 0, y: 0, width: self.view.frame.width, height: self.view.frame.height)
        self.view.layer.insertSublayer(previewLayer, at: 0)
        
        session.startRunning()
    }
    
    func captureOutput(_ output: AVCaptureOutput, didOutput sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection) {
        // 获取图片信息
        guard let imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer) else {
            return
        }
        // 转换为CIImage
        let ciImage = CIImage(cvImageBuffer: imageBuffer)
        // 转换UIImage
        let img = UIImage(ciImage: ciImage)
        // 回到主线程更新UI
        DispatchQueue.main.async {
            self.imageView.image = img
        }
    }
}

十四、聚焦

AVCaptureFocusModeLocked
设置一个固定的聚焦点
AVCaptureFocusModeAutoFocus
首次自动对焦然后锁定一个聚焦点
AVCaptureFocusModeContinuousAutoFocus
指当场景改变，相机会自动重新对焦到画面的中心点

十五、曝光模式

AVCaptureExposureModeContinuousAutoExposure
自动调节曝光模式
AVCaptureExposureModeLocked
exposurePoint

十六、闪光灯模式

AVCaptureFlashModeOff
永不开启
AVCaptureFlashModeOn
总是开启
AVCaptureFlashModeAuto
自动开启,根据光线判断

十七、手电筒模式

AVCaptureTorchModeOff
AVCaptureTorchModeOn
AVCaptureTorchModeAuto

十八、设置设备方向

AVCaptureConnection *captureConnection = <#A capture connection#>;
if ([captureConnection isVideoOrientationSupported])
{
    AVCaptureVideoOrientation orientation = AVCaptureVideoOrientationLandscapeLeft;
    [captureConnection setVideoOrientation:orientation];
}

十九、获取输出流

AVCaptureMovieFileOutput
将数据写入文件
AVCaptureVideoDataOutput
将视频数据以回调形式输出视频帧
AVCaptureAudioDataOutput
将音频数据以回调形式输出音频帧
AVCaptureStillImageOutput
捕捉静态图片

二十、音频/视频的合成

资源参考

AVFoundation 框架

一、视频播放

二、视频录制

三、生成视频缩略图

四、自定义相机

五、回放

六、编辑

七、顺序播放多个音频

八、音频

九、视频

十、操作相机

十一、补光

十二、二维码识别

十三、直播

十四、聚焦

十五、曝光模式

十六、闪光灯模式

十七、手电筒模式

十八、设置设备方向

十九、获取输出流

二十、音频/视频的合成

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