node-airplay -- AirPlay client library for node.js

node-airplay is a client library for Apple's AirPlay remote playback protocol. It implements a simple AirPlay device browser using mdns and command interface.

Currently supported features:

• AirPlay device discovery
• Support for audio and video playback

Coming soon (maybe):

• Photo playback
• Robust error handling
• Better device information formatting (supported features/etc)

Quickstart

npm install airplay
node
> var browser = require('airplay').createBrowser();
> browser.on('deviceOnline', function(device) {
    device.play('http://host/somevideo.mp4', 0);
  });
> browser.start();

Installation

With npm:

npm install airplay

From source:

cd ~
git clone https://benvanik@github.com/benvanik/node-airplay.git
npm link node-airplay/

node-airplay depends on both node-plist and node_mdns. Unfortunately node_mdns is woefully out of date and has required many tweaks to get working, resulting in a fork.

If you're running node on FreeBSD (or maybe Linux) you may get errors during install about a missing dns_sd.h file. If so, install the Apple mDNS SDK:

wget http://www.opensource.apple.com/tarballs/mDNSResponder/mDNSResponder-522.1.11.tar.gz
tar zxvf mDNSResponder-522.11.tar.gz
cd mDNSResponder-333.10/mDNSPosix/
sudo gmake os=freebsd install

API

Browser

The browser is a discovery service that can be run to automatically detect the AirPlay-compatiable devices on the local network(s). Try only to create one browser per node instance, and if it's no longer needed stop it.

Create a browser using the createBrowser method:

var browser = require('airplay').createBrowser();

Attach to the browser events to track device discovery:

browser.on('deviceOnline', function(device) {
  console.log('device online: ' + device.id);
});
browser.on('deviceOffline', function(device) {
  console.log('device offline: ' + device.id);
});

Start or stop the discovery process:

browser.start();
browser.stop();

If you are running a server you can use the built-in device list instead of maintaining your own via the events:

function myHandler() {
  var devices = browser.getDevices();
  console.log(devices);
}

Device

A device instance represents a single AirPlay device on the local network. Devices are created either through the discovery process or by direct connection. Each device has only a single control channel, and all methods are asynchronous.

Obtain devices using the browser API:

// Get all ready devices
var allDevices = browser.getDevices();
// Grab a device to play with
var device = allDevices[0];

TODO At some point, you'll be able to connect directly:

var device = require('airplay').connect(deviceHost);
device.on('ready', function() {
  // Ready to accept commands
});

If you are done with the device, close the connection (note that this will stop any playback):

device.close();

Issue various device control calls. All calls are asynchronous and have an optional callback that provides the result - for most, it's an empty object if the call was successful and null if the call failed.

// Get the current playback status
device.getStatus(function(res) {
  // res = {
  //   duration: number, -- in seconds
  //   position: number, -- in seconds
  //   rate: number, -- 0 = paused, 1 = playing
  //   ...
  // }
  // or, if nothing is playing, res = {}
});

// Play the given content (audio/video/etc)
var content = 'http://host/content.mp4';
var startPosition = 0; // in seconds
device.play(content, startPosition, function(res) {
  if (res) {
    // playing
  } else {
    // failed to start playback
  }
});

// Stop playback and return to the main menu
device.stop();

// Seek to the given offset in the media (if seek is supported)
var position = 500; // in seconds
device.scrub(position);

// Reverse playback direction (rewind)
// NOTE: may not be supported
device.reverse();

// Change the playback rate
// NOTE: only 0 and 1 seem to be supported for most media types
var rate = 0; // 0 = pause, 1 = resume
device.rate(rate);

// Adjust playback volume
// NOTE: may not be supported
device.volume(value);