RK3399 Camera调用USB摄像头（一）测试篇

新买的开发板RK3399外接USB摄像头，查看了下，RK3399 Android系统rom是支持底层UVC驱动的，将一些测试结果和测试demo记录下来，以免他人踩坑，如果有帮到你，请点个关注和start，谢谢

一、USB摄像头连接信息打印

1. Camera启动USB摄像头

• 当打开不存在相机时warn错误警告，监听该异常处理即可。几个错误问题：

  • 相机分辨率不支持问题，打开报错（系统相机默认打开的640*480），需要从HAL层进行修改
  • USB拔插地址问题，RK3399外接USB摄像头，默认时从/dev/video0地址，通过V4L2去打开。但是不确定时硬件USB接口问题还是驱动问题，导致偶尔拔插会出现Video1识别，导致打开失败的问题

• 获取Camera支持的分辨率列表，当USB摄像头不在列表之内，系统相机打开崩溃，当然自己软件调用相机没有问题

    打开不存在相机时warn错误警告，监听该异常处理即可
    System.err: java.lang.RuntimeException: Fail to connect to camera service
    System.err:     at android.hardware.Camera.<init>(Camera.java:496)
    System.err:     at android.hardware.Camera.open(Camera.java:345)
    System.err:     at com.yue.customcamera.handler.Camera1Control.startCamera(Camera1Control.java:169)
    System.err:     at com.yue.customcamera.handler.Camera1Control.access$000(Camera1Control.java:39)
    System.err:     at com.yue.customcamera.handler.Camera1Control$1.run(Camera1Control.java:138)
    System.err:     at android.os.Handler.handleCallback(Handler.java:755)
    System.err:     at android.os.Handler.dispatchMessage(Handler.java:95)
    System.err:     at android.os.Looper.loop(Looper.java:154)
    System.err:     at android.os.HandlerThread.run(HandlerThread.java:61)
  

2. 罗技USB2.0摄像头测试

• 插入：

    EventHub: No input device configuration file found for device 'UVC Camera (046d:0825)'.
    EventHub: Unable to disable kernel key repeat for /dev/input/event4: Function not implemented
    EventHub: New device: id=17, fd=280, path='/dev/input/event4', name='UVC Camera (046d:0825)', classes=0x80000401, configuration='', keyLayout='/system/usr/keylayout/Generic.kl', keyCharacterMap='/system/usr/keychars/Generic.kcm', builtinKeyboard=false, wakeMechanism=EPOLLWAKEUP, usingClockIoctl=true
    InputReader: Device added: id=17, name='UVC Camera (046d:0825)', sources=0x00002103		
  
    Added device UsbDevice[mName=/dev/bus/usb/005/002,mVendorId=1133,mProductId=2085,mClass=239,mSubclass=2,mProtocol=1,mManufacturerName=null,mProductName=null,mVersion=2.0,mSerialNumber=87430990,mConfigurations=[
    UsbConfiguration[mId=1,mName=null,mAttributes=128,mMaxPower=250,mInterfaces=[
    UsbInterface[mId=0,mAlternateSetting=0,mName=null,mClass=14,mSubclass=1,mPro