Script to Control an ONVIF PTZ Camera with a Logitech Extreme 3D Pro

ptz.js

const hid = require('node-hid');
const { Cam } = require('onvif');
const yargs = require('yargs/yargs');
const { hideBin } = require('yargs/helpers');

const argv = yargs(hideBin(process.argv))
  .option('hostname', {
    alias: 'h',
    describe: 'Server hostname',
    demandOption: true,
    type: 'string',
  })
  .option('port', {
    alias: 'p',
    describe: 'Server port',
    demandOption: true,
    type: 'number',
  })
  .option('username', {
    alias: 'u',
    describe: 'Username for authentication',
    demandOption: true,
    type: 'string',
  })
  .option('password', {
    alias: 'pw',
    describe: 'Password for authentication',
    demandOption: true,
    type: 'string',
  }).argv;

const device = new hid.HID(1133, 49685);
const camera = new Cam({
  hostname: argv.hostname,
  port: argv.port,
  username: argv.username,
  password: argv.password
}, function(err) {
  if (err) {
    console.log(err);
    return;
  }
  setInterval(updateCameraPosition, 100);
});

let xVelocity = 0;
let yVelocity = 0;
let zoom = 0;
let throttle = 0;
let isMoving = false;

const updateCameraPosition = () => {
  if (xVelocity !== 0 || yVelocity !== 0 || zoom !== 0) {
    const options = { x: xVelocity, y: yVelocity, zoom };
    console.log(options);
    camera.continuousMove(options);
  }
};

const processData = (buf) => {
    const inputs = {
      roll: ((buf[1] & 0x03) << 8) + buf[0],
      pitch: ((buf[2] & 0x0f) << 6) + ((buf[1] & 0xfc) >> 2),
      yaw: buf[3],
      throttle: -buf[5] + 255,
    };
  
    updateVelocityAndZoom(inputs);
    manageCameraMovement()
  };

device.on('data', processData);

function updateVelocityAndZoom(inputs) {
  throttle = inputs.throttle / 255;
  xVelocity = adjustVelocity(inputs.roll - 512, throttle);
  yVelocity = adjustVelocity(inputs.pitch - 512, throttle);
  zoom = Math.round((inputs.yaw - 128) / 128);
}

function adjustVelocity(value, throttle) {
  let velocity = (value / -512) * throttle;
  return Math.round(velocity * 4) / 4;
}

function manageCameraMovement() {
  const hasMovement = xVelocity !== 0 || yVelocity !== 0 || zoom !== 0;
  if (!hasMovement && isMoving) {
    console.log('Stopping movement');
    camera.stop();
    isMoving = false;
  } else if (hasMovement && !isMoving) {
    console.log('Starting movement');
    isMoving = true;
    updateCameraPosition();
  }
}

Example usage: node ptz --hostname 192.168.0.206 --port 2000 --username admin --password admin