synesthesia-snippet-server.js

var http = require('http')
var fs = require('fs')
var socket = require('socket.io')
var midi = require('midi')

var app = http.createServer()
var io = socket(app)
app.listen(5000)


///////////////////////////////////////////////////////////////////////////////
//// SOCKETS & CLIENTS
///////////////////////////////////////////////////////////////////////////////

let clients = []

// a new socket client has connected
io.on(`connection`, (client) => {
  clients.push(client)
  console.log(`-> New socket client connected, total: ${clients.length}`)

  // listen for disconnects of this client
  client.on(`disconnect`, () => {
    clients.splice(clients.indexOf(client), 1)
    console.log(`-> Socket client disconnected, total: ${clients.length}`)
  })
})


///////////////////////////////////////////////////////////////////////////////
//// MIDI INPUT
///////////////////////////////////////////////////////////////////////////////

// open the first available midi input port
let midiInput = new midi.input()
midiInput.openPort(0)
midiInput.ignoreTypes(true, true, true)

// listen for midi messages, forward messages to all clients
midiInput.on('message', (deltaTime, message) => {

  // wipe message   [ 176, 1, 127 ]
  if(message[0] === 176 && message[1] === 1)
    return clients.forEach((c) => { c.emit(`control`, `wipe`) })

  // reload message [ 176, 2, 127 ]
  if(message[0] === 176 && message[1] === 2)
    return clients.forEach((c) => { c.emit(`control`, `reload`) })

  // note on message [144, ...]
  if(message[0] === 144)
    return clients.forEach((c) => { c.emit(`midi`, message) })
  
})