how to add a callback function for processing opencv frames ?

[envery]

After reading the documentation jiangdongguo/AndroidUSBCamera , I think we should add

// acquire raw data(NV21 or RGBA)
setPreviewDataCallBack(callBack)

but I don 't know how to do it , maybe you can help me ?
Best regards !

[t2ui]

I currently have this code, but I'm not sure if it is correct.

        cameraClient.addPreviewDataCallBack(object : IPreviewDataCallBack {
            override fun onPreviewData(data: ByteArray?, width: Int, height: Int, format: IPreviewDataCallBack.DataFormat) {
                val frameData = data       //Frame data form camera
            }
        })