AUSBC 

class DemoFragment: CameraFragment() {
    private var mViewBinding: FragmentUvcBinding? = null

    override fun getRootView(inflater: LayoutInflater, container: ViewGroup?): View? {
        if (mViewBinding == null) {
            mViewBinding = FragmentUvcBinding.inflate(inflater, container, false)
        }
        return mViewBinding?.root
    }

    // if you want offscreen render
    // please return null
    override fun getCameraView(): IAspectRatio? {
        return mViewBinding?.tvCameraRender
    }

    // if you want offscreen render
    // please return null, the same as getCameraView()
    override fun getCameraViewContainer(): ViewGroup? {
        return mViewBinding?.container
    }

    // camera open status callback
    override fun onCameraState(self: ICamera, 
                               code: ICameraStateCallBack.State,
                               msg: String?) {
        when (code) {
            ICameraStateCallBack.State.OPENED -> handleCameraOpened()
            ICameraStateCallBack.State.CLOSED -> handleCameraClosed()
            ICameraStateCallBack.State.ERROR -> handleCameraError()
        }
    }
    
    override fun getGravity(): Int = Gravity.TOP
}

// if you want to open a camera default
// please override getDefaultCamera()
override fun getDefaultCamera(): UsbDevice? {
    return super.getDefaultCamera()
}

// if you want to custom camera requst
// please override getCameraRequest()
override fun getCameraRequest(): CameraRequest {
    return CameraRequest.Builder()
    .setPreviewWidth(1280) // camera preview width
    .setPreviewHeight(720) // camera preview height
    .setRenderMode(CameraRequest.RenderMode.OPENGL) // camera render mode
    .setDefaultRotateType(RotateType.ANGLE_0) // rotate camera image when opengl mode
    .setAudioSource(CameraRequest.AudioSource.SOURCE_AUTO) // set audio source
    .setPreviewFormat(CameraRequest.PreviewFormat.FORMAT_YUYV) // set preview format, MJPEG recommended
    .setAspectRatioShow(true) // aspect render,default is true
    .setCaptureRawImage(false) // capture raw image picture when opengl mode
    .setRawPreviewData(false)  // preview raw image when opengl mode
    .create()
}

// capture jpg image
captureImage(callBack, savePath)
// capture mp4 video
captureVideoStart(callBack, path, durationInSec)
captureVideoStop()
// capture stream(H.264/AAC) only
captureStreamStart()
captureStreamStop()
// capture mp4 video
captureVideoStart(callBack, path, durationInSec)
captureVideoStop()
// capture mp3 audio
captureAudioStart(callBack, path)
captureAudioStop()
// play mic in real time
startPlayMic(callBack)
stopPlayMic()
// rotate camera
// base on opening opengl es
setRotateType(type)
// switch different camera
switchCamera(UsbDevice)
// update resolution
updateResolution(width, height)
// get all preview sizes
getAllPreviewSizes(aspectRatio)
// acquire encode data(H.264 or AAC)
addEncodeDataCallBack(callBack)
// acquire raw data(NV21 or RGBA)
setPreviewDataCallBack(callBack)
// get current camera
getCurrentCamera()
// get current camera status
isCameraOpened()
// get all camera device list
getDeviceList()

setZoom(0)
setSharpness(0)
setHue(0)
setSaturation(0)
setContrast(0)
setGamma(0)
setGain(0)
setAutoWhiteBalance(true)
setAutoFocus(true)
// send custom command to camera
sendCameraCommand(command)

// First, extending AbstractEffect
class EffectBlackWhite(ctx: Context) : AbstractEffect(ctx) {

    override fun getId(): Int = ID

    override fun getClassifyId(): Int = CameraEffect.CLASSIFY_ID_FILTER

    override fun getVertexSourceId(): Int = R.raw.base_vertex

    override fun getFragmentSourceId(): Int = R.raw.effect_blackw_fragment

    companion object {
        const val ID = 100
    }
}

// Second, adding or updating or removing filter
addRenderEffect(effect)
removeRenderEffect(effect)
updateRenderEffect(classifyId, effect)

class DemoMultiCameraFragment : MultiCameraFragment(), ICameraStateCallBack {

    // a camera be attached
    override fun onCameraAttached(camera: MultiCameraClient.Camera) {}
    
	// a camera be detached
    override fun onCameraDetached(camera: MultiCameraClient.Camera) {}

    // a camera be connected
    override fun onCameraConnected(camera: MultiCameraClient.Camera) {
  		camera.openCamera(textureView, getCameraRequest())
        camera.setCameraStateCallBack(this)
    }

    // a camera be disconnected
    override fun onCameraDisConnected(camera: MultiCameraClient.Camera) {
         camrea.closeCamera()
    }

    // a camera be opened or closed or error
    override fun onCameraState(
        self: MultiCameraClient.Camera,
        code: ICameraStateCallBack.State,
        msg: String?) {
		when (code) {
            ICameraStateCallBack.State.OPENED -> handleCameraOpened()
            ICameraStateCallBack.State.CLOSED -> handleCameraClosed()
            ICameraStateCallBack.State.ERROR -> handleCameraError()
        }
    }

    override fun getRootView(inflater: LayoutInflater, container: ViewGroup?): View {
        return rootView
    }
    
    // [optional]
    // If you want to open the specified camera,
    // you need to let isAutoRequestPermission() false.
    // And then you need to call requestPermission(device) in your own Fragment/Activity
    // when onAttachDev() called, default is true.
    protected fun isAutoRequestPermission() = true
}