StageLinq

NodeJS library implementation to access information through the Denon StageLinq protocol.

Features

• Tested with Denon two SC6000s, X1850, Prime 4, Prime 2, and Prime Go.
• Event emitters for state changes, tracks getting loaded, and current playing track.
• Event emitter for debug logging.
• Downloads source databases for you.
• You can implement handling the database yourself or use this library's BetterSqlite3 dependency.

Usage

import { StageLinq } from '../StageLinq';

const options = { downloadDbSources: true };
const stageLinq = new StageLinq(options);

stageLinq.devices.on('ready', (connectionInfo) => {
  console.log(`Device ${connectionInfo.software.name} on ` +
    `${connectionInfo.address}:${connectionInfo.port} is ready.`);
});

stageLinq.devices.on('trackLoaded', (status) => {
  console.log(`"${status.title}" - ${status.artist} loaded on player ` +
    `${status.deck})`);
});

stageLinq.devices.on('nowPlaying', (status) => {
  console.log(`Now Playing: "${status.title}" - ${status.artist})`);
});

A complete example with all events and options can be found in the CLI.

Overview

The idea behind this library is to have a structure something like this:

StageLinq > Devices > Player > Deck

A StageLinq sets up a device listener and a class that handles all the devices (StageLinqDevices).

StageLinqDevices figures out if it wants to connect or not and handles connections. There may be one or more device on the network. For each device it will try to connect to it and subscribe to it's StateMap.

Currently there is only one type of device: Player. A Player may have up to 4 decks A, B, C, D (aka "layers"). The Player handles incoming messages, parses them, groups them, and emits events. These events bubble up to the Device.

Database

You can use BetterSqlite3 bundled into this library or let this library download the files for you, then choose your own Sqlite library to query the database. See CLI example.

Logging

I needed the logging to be used outside of the library so I made them events that you can listen to.

• error: When something bad happens.
• warn: When something happens but doesn't affect anything.
• info/log: When we have something to say
• debug: Spits out the parsed version of the packets.
• silly: Dumps all kinds of internal stuff

About

Additional reverse engineering work: https://github.com/chrisle/stagelinq-pcap

Used in my app Now Playing https://www.nowplaying2.com