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'use strict'
function IO (terminal) {
const dgram = require('dgram')
this.midi = { device: 0 }
this.outputs = []
this.stack = { keys: [] }
this.start = function () {
this.clear()
this.midiSetup()
}
this.clear = function () {
this.stack.udp = []
this.stack.midi = []
}
this.run = function () {
if (this.length() < 1) { return }
for (const id in this.stack.udp) {
this.playUdp(this.stack.udp[id])
}
for (const id in this.stack.midi) {
this.playMidi(this.stack.midi[id])
}
}
// Keyboard
this.sendKey = function (key) {
this.stack.keys = [key]
}
this.playKey = function (key) {
// Idle. Read by the ! operator.
}
// UDP
this.sendUdp = function (msg) {
this.stack.udp.push(msg)
}
this.playUdp = function (data) {
const udp = dgram.createSocket('udp4')
udp.send(Buffer.from(`${data}`), 49160, 'localhost', (err) => {
udp.close()
})
}
// Midi
this.sendMidi = function (channel, octave, note, velocity, length) {
this.stack.midi.push([channel, octave, note, velocity, length])
}
this.playMidi = function (data) {
const device = this.midi.device
const channel = convertChannel(data[0])
const note = convertNote(data[1], data[2])
const velocity = data[3]
const length = window.performance.now() + convertLength(data[4], terminal.bpm)
if (!this.outputs[device]) { console.warn('No midi device!'); return }
this.outputs[device].send([channel[0], note, velocity])
this.outputs[device].send([channel[1], note, velocity], length)
}
this.setMidiDevice = function (id = 0) {
this.midi.device = clamp(id, 0, this.outputs.length - 1)
console.log(this.outputs[this.midi.device] ? `Set device to #${this.midi.device} — ${this.outputs[this.midi.device].name}` : 'Missing midi device with id.')
return this.outputs[this.midi.device]
}
this.listMidiDevices = function () {
return this.outputs
}
//
function convertChannel (id) {
// return [id + 144, id + 128].toString(16);
if (id === 0) { return [0x90, 0x80] } // ch1
if (id === 1) { return [0x91, 0x81] } // ch2
if (id === 2) { return [0x92, 0x82] } // ch3
if (id === 3) { return [0x93, 0x83] } // ch4
if (id === 4) { return [0x94, 0x84] } // ch5
if (id === 5) { return [0x95, 0x85] } // ch6
if (id === 6) { return [0x96, 0x86] } // ch7
if (id === 7) { return [0x97, 0x87] } // ch8
if (id === 8) { return [0x98, 0x88] } // ch9
if (id === 9) { return [0x99, 0x89] } // ch10
if (id === 10) { return [0x9A, 0x8A] } // ch11
if (id === 11) { return [0x9B, 0x8B] } // ch12
if (id === 12) { return [0x9C, 0x8C] } // ch13
if (id === 13) { return [0x9D, 0x8D] } // ch14
if (id === 14) { return [0x9E, 0x8E] } // ch15
if (id === 15) { return [0x9F, 0x8F] } // ch16
}
function convertNote (octave, note) {
return 24 + (octave * 12) + note // 60 = C3
}
function convertLength (val, bpm) {
return (60000 / bpm) / val
}
// Setup
this.midiSetup = function () {
if (!navigator.requestMIDIAccess) { return }
navigator.requestMIDIAccess({ sysex: false }).then(this.midiActive, this.midiInactive)
}
this.midiActive = function (midiAccess) {
const iter = midiAccess.outputs.values()
for (let i = iter.next(); i && !i.done; i = iter.next()) {
terminal.io.outputs.push(i.value)
}
console.log(terminal.io.outputs[terminal.io.midi.device] ? `Midi is active, devices(${terminal.io.midi.device + 1}/${terminal.io.outputs.length}): ${terminal.io.outputs[terminal.io.midi.device].name}` : 'No Midi device')
}
this.midiInactive = function (err) {
console.warn('No Midi', err)
}
this.length = function () {
return this.stack.udp.length + this.stack.midi.length + this.stack.keys.length
}
this.toString = function () {
let text = ''
for (let i = 0; i < this.length(); i++) {
text += '|'
}
while (text.length - 1 <= terminal.size.grid.w) {
text += '-'
}
return text
}
function clamp (v, min, max) { return v < min ? min : v > max ? max : v }
}
module.exports = IO
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