avfoundation.framework的学习

最近学习自定义相机的相关知识，可以自定义相机成功，但是对AVFoundation不是很了解，这里有必要对这个AVFoundation.framework。

（感觉写点东西咋这么困难）

学习类对象

AVCaptureSession、AVCaptureInput 和 AVCaptureOutput 的学习

AVCaptureInput is an abstract base-class describing an input data source to an AVCaptureSession object. 

AVCaptureOutput is an abstract base class describing an output destination of an AVCaptureSession object

You use an AVCaptureSession object to coordinate the flow of data from AV input devices to outputs

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#####参考连接
苹果AVFoundation ref

苹果AVFoundation Programming Guide