1 自定義攝像頭

AVFoundation

要想熟悉OC里面的框架 理解這個(gè)框架結(jié)構(gòu)圖必不可少 不過(guò)這是我盜過(guò)來(lái)的圖 嘿嘿嘿 這是 AVFoundation 框架圖

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AVAudioToolBox

VideoToolBox

AVCaptureDevice

AVCaptureDeviceInput

AVCaptureSession

AVCaptureVideoPreviewLayer

  // 輸入設(shè)備 
    import UIKit
    import AVFoundation
class ViewController: UIViewController {
        override func viewDidLoad() {
            super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    do {
        // 輸入設(shè)備
        let cameraDevice = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)
        let inputDevice = try AVCaptureDeviceInput(device: cameraDevice)
        // 輸出設(shè)備
        let outputDevice = AVCaptureVideoDataOutput()
        outputDevice.videoSettings = [kCVPixelBufferPixelFormatTypeKey as String : NSNumber(value: kCVPixelFormatType_32BGRA)]
        outputDevice.setSampleBufferDelegate(self, queue: DispatchQueue.main)
        // capture session
        let captureSession = AVCaptureSession()
        captureSession.addInput(inputDevice)
        captureSession.addOutput(outputDevice)
        captureSession.beginConfiguration()
        //設(shè)置分辨率
        captureSession.canSetSessionPreset(AVCaptureSessionPreset1280x720)
        // connection
        if let connection = outputDevice.connection(withMediaType: AVMediaTypeVideo){
            connection.videoOrientation = .portrait;
        }
        captureSession.commitConfiguration()
        if let previewLayer = AVCaptureVideoPreviewLayer(session: captureSession){
            previewLayer.videoGravity = AVLayerVideoGravityResizeAspect
            previewLayer.frame = self.view.bounds
            self.view.layer.addSublayer(previewLayer)
        }
        captureSession.startRunning()
        
    } catch _ {
        
    }
    
}
override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
    }
 }
 extension ViewController: AVCaptureVideoDataOutputSampleBufferDelegate{
      func captureOutput(_ captureOutput: AVCaptureOutput!,   didOutputSampleBuffer sampleBuffer: CMSampleBuffer!, from connection: AVCaptureConnection!) {
 }
}

項(xiàng)目中可能會(huì)報(bào)這樣的錯(cuò)誤

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也不用慌張這是因?yàn)镮OS在8.0之后加了視頻 音頻等設(shè)備的訪問(wèn)權(quán)限 在info.plist里面加上 這三條先

 <key>NSCameraUsageDescription</key>
   <string>cameraDesciption</string>
 <key>NSContactsUsageDescription</key>
   <string>contactsDesciption</string>
 <key>NSMicrophoneUsageDescription</key>
   <string>microphoneDesciption</string>
 <key>NSPhotoLibraryUsageDescription</key>
   <string>photoLibraryDesciption</string>

獲取的視頻源會(huì)通過(guò)AVCaptureVideoDataOutputSampleBufferDelegate 代理生成
CMSampleBuffer 在這里我們可以通過(guò) CMSampleBuffer實(shí)現(xiàn)視頻截圖功能這個(gè)功能可以自行百度這里不做展開 下一章介紹 CMSampleBuffer

附錄 1 錄制視頻功能以及保存

這部分的功能可能平時(shí)用的不多 僅做參考 當(dāng)然了 有更加簡(jiǎn)單的方式錄制視頻 但是并不好擴(kuò)展 比如加濾鏡效果等 還有一部分原因是為后面更好的學(xué)習(xí)視頻編碼。很多人在找IFonx之類的軟件 應(yīng)該8.0之后這個(gè)軟件就不做更新了 那么怎么看我保存的文件 只要在 info.plist 文件加上一個(gè) UIFileSharingEnabled 設(shè)置為YES， 然后打開電腦端的iTunes 連接 去看項(xiàng)目 就可以看到Document里面的文件了 然后將視頻導(dǎo)出 看是否有錯(cuò)誤 如果有錯(cuò)誤看自己設(shè)置是不是有問(wèn)題 如圖所示

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干貨 代碼如下

附錄 2 視頻截圖功能