通过AVFoundation获取摄像头数据[Swift]

概述真的好久没写Blog了。。囧 捕捉硬件数据需要用到以下几个类 AVCaptureSessionAVCaptureDeviceInputAVCaptureVideoDataOutputAVCaptureVideoPreviewLayer AVCaptureSession 控制着硬件的Input以及数据的Output(就理解为控制器吧) AVCaptureDeviceInput 硬件的输入（从A

真的好久没写Blog了。。囧

捕捉硬件数据需要用到以下几个类

AVCaptureSessionAVCaptureDeviceinputAVCaptureVIDeoDataOutputAVCaptureVIDeoPrevIEwLayer

AVCaptureSession

控制着硬件的input以及数据的Output(就理解为控制器吧)

AVCaptureDeviceinput

硬件的输入（从AVCaptureDevice对象中捕捉输入相关得数据）

AVCaptureVIDeoDataOutput

视频数据的输出(AVCaptureOutput的子类,捕捉输出相关得属性)

AVCaptureVIDeoPrevIEwLayer

预览视图

说下大概得逻辑

初始化Session(负责协调输入,输出数据交互)

通过AVCaptureDevice.defaultDeviceWithMediaType方法来获取AVCaptureDevice(音频,视频) 具体看你传进去得参数而定

初始化输入,输出 对象

设置输出画质,将输入,输出 对象添加进session中

创建GCD并设置输出对象的相关回调

代码部分

检测摄像头权限是否可用以及跳转设置的函数

func checkVIDeoAuth() 

func openSettings()

这里的跳转设置函数是在IOS8以后才可使用的

摄像头输入输出设置的相关设置

func setupCamera() 

完整代码如下

////  VIEwController.swift//  CameraExample////  Created by Peter_Qin on 15/11/20.//  copyright © 2015年 Chin_Hui. All rights reserved.//import UIKitimport AVFoundationclass VIEwController: UIVIEwController,AVCaptureVIDeoDataOutputSampleBufferDelegate,UIAlertVIEwDelegate {    /// 摄像头授权状态    var cameraAuthStatus: AVAuthorizationStatus!    /// 预览Layer    var captureVIDeoPrevIEwLayer: AVCaptureVIDeoPrevIEwLayer!        /// Session    var session: AVCaptureSession!        /// 硬件input    var captureinput:AVCaptureDeviceinput!        /// 数据Output    var captureOutput:AVCaptureVIDeoDataOutput!        var customimgVIEw: UIImageVIEw!        /**     跳转至设置     */    func openSettings() {                let settingsURL:NSURL = NSURL(string:UIApplicationopenSettingsURLString)!        UIApplication.sharedApplication().openURL(settingsURL)        }        /**     Check vIDeo authorization status     */    func checkVIDeoAuth() {        switch AVCaptureDevice.authorizationStatusForMediaType(AVMediaTypeVIDeo)        {        case AVAuthorizationStatus.Authorized://已经授权            self.cameraAuthStatus = AVAuthorizationStatus.Authorized            break        case AVAuthorizationStatus.NotDetermined:                        AVCaptureDevice.requestAccessForMediaType(AVMediaTypeVIDeo,completionHandler: { (granted: Bool) -> VoID in                                if(granted){                    //受限制                    self.cameraAuthStatus = AVAuthorizationStatus.Restricted                    exit(0)                }                            })                        break        case AVAuthorizationStatus.DenIEd:            AVCaptureDevice.requestAccessForMediaType(AVMediaTypeVIDeo,completionHandler: { (granted: Bool) -> VoID in                                if(!granted){                    //否认                    self.cameraAuthStatus = AVAuthorizationStatus.DenIEd                                        let warnMsg:UIAlertVIEw = UIAlertVIEw(Title: "提示",message: "摄像头权限未未开启,点击确认跳转至设置",delegate: self,cancelbuttonTitle: "确认")                    warnMsg.show()                                    }                            })            break        default:            break        }    }        /**     摄像头设置相关 By Hui     */    func setupCamera() {                self.session = AVCaptureSession()        let device = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVIDeo)!        self.captureOutput = AVCaptureVIDeoDataOutput()        do{            try self.captureinput = AVCaptureDeviceinput(device: device)        }catch let error as NSError{            print(error)        }                        self.checkVIDeoAuth()        self.session.beginConfiguration()        //画面质量设置        self.session.sessionPreset = AVCaptureSessionPreset1920x1080        self.captureOutput.vIDeoSettings = [kCVPixelBufferPixelFormatTypeKey:NSNumber(unsignedInt: kCVPixelFormatType_32BGRA),kCVPixelBufferWIDthKey:NSNumber(integer: 1920),kCVPixelBufferHeightKey:NSNumber(integer: 1080)]                if(self.session.canAddinput(self.captureinput)){            self.session.addinput(self.captureinput)        }        if(self.session.canAddOutput(self.captureOutput)){            self.session.addOutput(self.captureOutput)        }                let subQueue:dispatch_queue_t = dispatch_queue_create("subQueue",nil)        captureOutput.setSampleBufferDelegate(self,queue: subQueue)                //预览Layer设置        self.captureVIDeoPrevIEwLayer = AVCaptureVIDeoPrevIEwLayer(session: self.session)        self.captureVIDeoPrevIEwLayer.frame = CGRectMake(self.vIEw.frame.size.wIDth/2 - (320/2),320,240)        self.captureVIDeoPrevIEwLayer.vIDeoGravity = AVLayerVIDeoGravityResizeAspectFill        self.vIEw.layer.addSublayer(self.captureVIDeoPrevIEwLayer)        self.session.commitConfiguration()            }        overrIDe func vIEwDIDLoad() {        super.vIEwDIDLoad()        // Do any additional setup after loading the vIEw,typically from a nib.                self.setupCamera()                self.customimgVIEw = UIImageVIEw(frame: CGRectMake(self.captureVIDeoPrevIEwLayer.frame.origin.x,250,240))        self.vIEw.addSubvIEw(self.customimgVIEw)            }        overrIDe func vIEwWillAppear(animated: Bool) {        super.vIEwWillAppear(animated)        self.session.startRunning()    }        overrIDe func vIEwWilldisappear(animated: Bool) {        self.session.stopRunning()        super.vIEwWilldisappear(animated)    }        /**     数据流BufferRef转Image          - parameter sampleBuffer: 数据流          - returns: UIImage     */    func getimageData(sampleBuffer:CMSampleBuffer!)-> UIImage {            let imageBuffer:CVImageBufferRef = CMSampleBufferGetimageBuffer(sampleBuffer)!        CVPixelBufferLockBaseAddress(imageBuffer,0)                let bytesPerRow:size_t = CVPixelBufferGetBytesPerRow(imageBuffer)        let wIDth:size_t  = CVPixelBufferGetWIDth(imageBuffer)        let height:size_t = CVPixelBufferGetHeight(imageBuffer)                        let safepoint:UnsafeMutablePointer<VoID> = CVPixelBufferGetBaseAddress(imageBuffer)                let bitMAPInfo:UInt32 = CGBitmAPInfo.ByteOrder32little.rawValue | CGImageAlphaInfo.PremultiplIEdFirst.rawValue                //RGB        let colorSpace: CGcolorSpaceRef = CGcolorSpaceCreateDeviceRGB()!        let context:CGContextRef = CGBitmapContextCreate(safepoint,wIDth,height,8,bytesPerRow,colorSpace,bitMAPInfo)!                let quartimage: CGImageRef = CGBitmapContextCreateImage(context)!        CVPixelBufferUnlockBaseAddress(imageBuffer,0)                return UIImage(CGImage: quartimage,scale: 1,orIEntation: UIImageOrIEntation.Right)    }        //AVCaptureVIDeoDataOutputSampleBufferDelegate    func captureOutput(captureOutput: AVCaptureOutput!,dIDOutputSampleBuffer sampleBuffer: CMSampleBuffer!,fromConnection connection: AVCaptureConnection!){                let localimg = self.getimageData(sampleBuffer)                //GCD 主线程队列中刷新UI        dispatch_async(dispatch_get_main_queue()) { () -> VoID in            self.customimgVIEw.image = localimg        }                    }        //UIAlertVIEwDelegate    func alertVIEw(alertVIEw: UIAlertVIEw,clickedbuttonAtIndex buttonIndex: Int){                if(buttonIndex == 0){            self.openSettings()        }            }    overrIDe func dIDReceiveMemoryWarning() {        super.dIDReceiveMemoryWarning()        // dispose of any resources that can be recreated.    }}

Developer官网有个Example 叫 AVCam-iOS

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