AVFoundation

照片、视频捕捉，小视频、直播都会用到AVFoundation框架
捕捉回话

• 捕捉回话：AVCaptureSession
• 捕捉设备：AVCaptureDevice
• 捕捉设备输入：AVCaptureDeviceInput
• 捕捉连接：AVCaptureConnection
• 捕捉预览：AVCaptureVideoPreviewLayer
• 捕捉设备输出：AVCaptureOutput(抽象类)
  • AVCaptureStillImageOutput
  • AVCaputureMovieFileOutput
  • AVCaputureAudioDataOutput
  • AVCaputureVideoDataOutput