通过AVFoundation获取摄像头数据[Swift] IOS

真的好久没写Blog了。。囧
捕捉硬件数据需要用到以下几个类

AVCaptureSession AVCaptureDeviceInput AVCaptureVideoDataOutput AVCaptureVideoPreviewLayer

AVCaptureSession
控制着硬件的Input以及数据的Output(就理解为控制器吧)
【通过AVFoundation获取摄像头数据[Swift]】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 UIKit import 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 inif(granted){ //受限制 self.cameraAuthStatus = AVAuthorizationStatus.Restricted exit(0) }})break case AVAuthorizationStatus.Denied: AVCaptureDevice.requestAccessForMediaType(AVMediaTypeVideo, completionHandler: { (granted: Bool) -> Void inif(!granted){ //否认 self.cameraAuthStatus = AVAuthorizationStatus.Deniedlet 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), 0, 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, 320, 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 = 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