start playback of a youtube clip on chromecast using castv2

gistfile1.js

var castv2Cli = require('castv2-client');
var inherits = require('util').inherits;
var Application = castv2Cli.Application;
var RequestResponseController = castv2Cli.RequestResponseController;
var extend = require('xtend');
var noop = function() {};
var slice = Array.prototype.slice;

var Api = function(client, session) {
  var that = this;
  Application.apply(this, arguments);
  this.reqres = this.createController(RequestResponseController,
    'urn:x-cast:com.google.cast.media');
  this.yt = this.createController(RequestResponseController,
    'urn:x-cast:com.google.youtube.mdx');

  var onMessage = function(response, broadcast) {
    if(response.type === 'MEDIA_STATUS' && broadcast) {
      var status = response.status[0];
      that.currentSession = status;
      that.emit(status.playerState.toLowerCase(), status);
      that.emit('status', status);
    }
  };

  var onClose = function() {
    that.removeListener('message', onMessage);
    that.stop();
  };

  this.reqres.on('message', onMessage);
  this.reqres.once('close', onClose);
};

Api.APP_ID = '233637DE';

inherits(Api, Application);

Api.prototype.getStatus = function(cb) {
  var that = this;
  this.reqres.request({ type: 'GET_STATUS' },
    function(err, response) {
      if(err) return callback(err);
      var status = response.status[0];
      that.currentSession = status;
      cb(null, status);
    }
  );
};

Api.prototype.load = function(videoId, cb) {
  var opts = {
    type: 'flingVideo',
    data: {
      currentTime: 0,
      videoId: videoId
    }
  };
  this.yt.request(opts);
  // TODO: find out why the request callback
  // never gets fired... for now just call cb directly..
  cb();
};

Api.prototype.getCurrentSession = function(cb) {
  if (this.currentSession) return cb(null, this.currentSession);
  this.getStatus(function(err, status) {
    if (err) return cb(err);
    cb(null, status);
  });
};

Api.prototype.sessionRequest = function(data, cb) {
  var that = this;
  cb = cb || noop;
  this.getCurrentSession(function(err, session) {
    if (err) return cb(err);
    var sessionId = session.mediaSessionId;
    that.reqres.request(extend(data, { mediaSessionId: sessionId } ),
      function(err, response) {
        if(err) return cb(err);
        cb(null, response.status[0]);
      }
    );
  });
};

Api.prototype.play = function(cb) {
  this.sessionRequest({ type: 'PLAY' }, cb);
};

Api.prototype.pause = function(cb) {
  this.sessionRequest({ type: 'PAUSE' }, cb);
};

Api.prototype.stop = function(cb) {
  this.sessionRequest({ type: 'STOP' }, cb);
};

Api.prototype.seek = function(currentTime, cb) {
  this.sessionRequest({
    type: 'SEEK',
    currentTime: currentTime
  }, cb);
};

module.exports = Api;