framework\av\services\camera\libcameraservice
api2 目录
common 目录
-> 代表继承
CameraDeviceClient.cpp -> Camera2ClientBase.cpp -> CameraDeviceBase:: NotificationListener
Camera3Device.cpp -> CameraDeviceBase
Camera2ClientBase.cpp 初始化中 mDevices = new Camera3Device ,
CameraDeviceClient 可以直接操作 Camera3Device