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'use strict'
function Midi (terminal) {
this.mode = 0
this.outputIndex = -1
this.inputIndex = -1
this.outputs = []
this.inputs = []
this.stack = []
this.start = function () {
console.info('Midi Starting..')
this.setup()
}
this.clear = function () {
}
this.update = function () {
terminal.controller.clearCat('default', 'Midi')
terminal.controller.add('default', 'Midi', `Refresh Device List`, () => { terminal.io.midi.setup(); terminal.io.midi.update() })
terminal.controller.addSpacer('default', 'Midi', 'spacer1')
// Outputs
if (this.outputs.length < 1) {
terminal.controller.add('default', 'Midi', `No Midi Outputs`)
} else {
for (const id in this.outputs) {
terminal.controller.add('default', 'Midi', `${this.outputs[id].name} ${terminal.io.midi.outputIndex === parseInt(id) ? ' — Output' : ''}`, () => { terminal.io.midi.selectOutput(id) }, '')
}
terminal.controller.add('default', 'Midi', `No Output ${terminal.io.midi.outputIndex === -1 ? ' — Output' : ''}`, () => { terminal.io.midi.selectOutput(-1) }, '')
terminal.controller.addSpacer('default', 'Midi', 'spacer2')
}
// Inputs
if (this.inputs.length < 1) {
terminal.controller.add('default', 'Midi', `No Midi Inputs`)
} else {
for (const id in this.inputs) {
terminal.controller.add('default', 'Midi', `${this.inputs[id].name} ${terminal.io.midi.inputIndex === parseInt(id) ? ' — Input' : ''}`, () => { terminal.io.midi.selectInput(id) }, '')
}
terminal.controller.add('default', 'Midi', `No Input ${terminal.io.midi.inputIndex === -1 ? ' — Input' : ''}`, () => { terminal.io.midi.selectInput(-1) }, '')
}
terminal.controller.commit()
}
this.run = function () {
this.stack = this.stack.filter((item) => {
const alive = item[4] > 0
const played = item[5]
if (alive !== true) {
this.trigger(item, false)
} else if (played !== true) {
this.trigger(item, true)
}
item[4]--
return alive
})
}
this.trigger = function (item, down) {
if (!this.outputDevice()) { console.warn('Midi', 'No midi output!'); return }
const channel = down === true ? 0x90 + item[0] : 0x80 + item[0]
const note = 24 + (item[1] * 12) + item[2]
const velocity = item[3]
this.outputDevice().send([channel, note, velocity])
item[5] = true
}
this.send = function (channel, octave, note, velocity, length, played = false) {
for (const id in this.stack) {
const item = this.stack[id]
if (item[0] === channel && item[1] === octave && item[2] === note) {
item[3] = velocity
item[4] = length
item[5] = played
return
}
}
this.stack.push([channel, octave, note, velocity, length, played])
}
this.silence = function () {
this.stack = this.stack.filter((item) => {
this.trigger(item, false)
return false
})
}
// Clock
this.ticks = []
// TODO
this.sendClock = function () {
if (!this.outputDevice()) { return }
if (this.sendClock !== true) { return }
const bpm = terminal.clock.speed.value
const frameTime = (60000 / bpm) / 4
const frameFrag = frameTime / 6
for (let id = 0; id < 6; id++) {
if (this.ticks[id]) { clearTimeout(this.ticks[id]) }
this.ticks[id] = setTimeout(() => { this.outputDevice().send([0xF8], 0) }, parseInt(id) * frameFrag)
}
}
this.count = 0
this.receive = function (msg) {
switch (msg.data[0]) {
case 0xF8:
this.count = (this.count + 1) % 6
if (this.count % 4 === 0) {
terminal.clock.tap()
}
break
case 0xFA:
console.log('Midi', 'Clock start.')
terminal.clock.play()
break
case 0xFC:
console.log('Midi', 'Clock stop.')
terminal.clock.stop()
break
}
}
// Tools
this.selectOutput = function (id) {
if (id === -1) { this.outputIndex = -1; this.update(); return }
if (!this.outputs[id]) { return }
this.outputIndex = parseInt(id)
console.log('Midi', `Output Device: ${this.outputDevice().name}`)
this.update()
}
this.selectInput = function (id) {
if (this.inputDevice()) { this.inputDevice().onmidimessage = null }
if (id === -1) { this.inputIndex = -1; this.update(); return }
if (!this.inputs[id]) { return }
this.inputIndex = parseInt(id)
this.inputDevice().onmidimessage = (msg) => { this.receive(msg) }
console.log('Midi', `Input Device: ${this.inputDevice().name}`)
this.update()
}
this.outputDevice = function () {
return this.outputs[this.outputIndex]
}
this.inputDevice = function () {
return this.inputs[this.inputIndex]
}
// Setup
this.setup = function () {
if (!navigator.requestMIDIAccess) { return }
this.outputs = []
navigator.requestMIDIAccess({ sysex: false }).then(this.access, (err) => {
console.warn('No Midi', err)
})
}
this.access = function (midiAccess) {
const outputs = midiAccess.outputs.values()
for (let i = outputs.next(); i && !i.done; i = outputs.next()) {
terminal.io.midi.outputs.push(i.value)
}
terminal.io.midi.selectOutput(0)
const inputs = midiAccess.inputs.values()
for (let i = inputs.next(); i && !i.done; i = inputs.next()) {
terminal.io.midi.inputs.push(i.value)
}
terminal.io.midi.selectInput(-1)
}
// UI
this.toString = function () {
return this.outputDevice() ? `${this.outputDevice().name}` : 'No Midi'
}
function clamp (v, min, max) { return v < min ? min : v > max ? max : v }
}
module.exports = Midi
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