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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,77 +1,81 @@ | ||
| import { noop } from "svelte/internal" | ||
| import { get } from "svelte/store" | ||
| import { userConfig } from "./config" | ||
|
|
||
| // TODO: convert to webmidi.js, much easier to work with | ||
| import { EventEmitter } from "eventemitter3" | ||
| import { WebMidi } from "webmidi" | ||
|
|
||
| let midi | ||
| let outputs = [] | ||
| let buttonPressCallback = noop | ||
| import { alert } from "./alerts" | ||
| import { userConfig } from "./config" | ||
|
|
||
| let lastLEDValue = 0 | ||
| const MIDI_BTN_CTRL = 0x10 | ||
| const MIDI_LED_CTRL = 0x11 | ||
| const BTN_PRESSED = 0x7f | ||
|
|
||
| export const LED_OFF = 0 | ||
| export const LED_ON = 1 | ||
| export const LED_FLASH = 2 | ||
| export const LED_PULSATE_SLOW = 3 | ||
| export const LED_PULSATE_FAST = 4 | ||
| const ledStrings = ["off", "on", "flash", "pulsate/slow", "pulsate/fast"] | ||
|
|
||
| const updateMidiDevices = (enabled = null) => { | ||
| if (enabled === null) { | ||
| enabled = get(userConfig).enableMIDIButtonBox | ||
| } | ||
| export const midiButtonPresses = new EventEmitter() | ||
|
|
||
| if (!enabled) { | ||
| setLED(LED_OFF, true) | ||
| } | ||
| let lastLEDValue = LED_OFF | ||
| let enabled = false | ||
|
|
||
| outputs = [] | ||
| window.addEventListener("beforeunload", () => { | ||
| midiSetLED(LED_OFF, true) | ||
| }) | ||
|
|
||
| for (const ports of [midi.inputs, midi.outputs]) { | ||
| for (const [, port] of ports) { | ||
| const input = port instanceof MIDIInput | ||
| if (enabled) { | ||
| port.open() | ||
| if (input) { | ||
| port.onmidimessage = ({ data }) => { | ||
| if (data.length === 3 && data[0] === 0xb0 && data[1] === 0x10 && data[2] === 0x7f) { | ||
| buttonPressCallback(data) | ||
| } | ||
| } | ||
| } else { | ||
| port.send([0xb0, 0x11, lastLEDValue]) | ||
| outputs.push(port) | ||
| const enableListeners = () => { | ||
| WebMidi.addListener("connected", ({ port }) => { | ||
| if (port.type === "input") { | ||
| console.log(`Got midi input: ${port.name} (installing press listener)`) | ||
| port.channels[1].addListener("controlchange", (event) => { | ||
| if (event.controller.number === MIDI_BTN_CTRL) { | ||
| midiButtonPresses.emit(event.rawValue === BTN_PRESSED ? "pressed" : "released") | ||
| } | ||
| } else { | ||
| port.close() | ||
| } | ||
| }) | ||
| } else if (port.type === "output") { | ||
| console.log(`Got midi output: ${port.name} (set LED to ${ledStrings[lastLEDValue]})`) | ||
| port.channels[1].sendControlChange(MIDI_LED_CTRL, lastLEDValue) | ||
| } | ||
| } | ||
| }) | ||
| } | ||
|
|
||
| userConfig.subscribe(({ enableMIDIButtonBox }) => { | ||
| if (midi) { | ||
| updateMidiDevices(enableMIDIButtonBox) | ||
| } | ||
| }) | ||
|
|
||
| export let setLED = (value, skipSave = false) => { | ||
| console.log(`Set LED to ${value}`) | ||
| for (const port of outputs) { | ||
| port.send([0xb0, 0x11, value]) | ||
| export const midiSetLED = (value, skipSave = false) => { | ||
| if (enabled) { | ||
| console.log(`Set LED to ${ledStrings[value]}`) | ||
| for (const output of WebMidi.outputs) { | ||
| output.channels[1].sendControlChange(MIDI_LED_CTRL, value) | ||
| } | ||
| } | ||
| // Save state, to re-enable if device is plugged in | ||
| if (!skipSave) { | ||
| lastLEDValue = value | ||
| } | ||
| } | ||
|
|
||
| export let registerButtonPressCallback = (callback) => (buttonPressCallback = callback) | ||
| ;(async () => { | ||
| midi = await navigator.requestMIDIAccess({ sysex: true }) | ||
| updateMidiDevices() | ||
| midi.onstatechange = () => updateMidiDevices() | ||
| })() | ||
|
|
||
| window.addEventListener("beforeunload", () => { | ||
| setLED(LED_OFF, true) | ||
| userConfig.subscribe(({ enableMIDIButtonBox }) => { | ||
| if (enableMIDIButtonBox && !enabled) { | ||
| enableListeners() | ||
| WebMidi.enable({ | ||
| sysex: true, | ||
| callback: (error) => { | ||
| if (error) { | ||
| enabled = false | ||
| console.error("Error enabling WebMidi!", error) | ||
| alert("Error enabling MIDI subsystem for button box", "error") | ||
| userConfig.update(($config) => ({ ...$config, enableMIDIButtonBox: false })) | ||
| } else { | ||
| console.log("WebMidi enabled") | ||
| enabled = true | ||
| } | ||
| } | ||
| }) | ||
| } else if (!enableMIDIButtonBox && enabled) { | ||
| midiSetLED(LED_OFF, true) | ||
| WebMidi.disable() | ||
| enabled = false | ||
| console.log("WebMidi disabled") | ||
| } | ||
| }) | ||
|
|
||
| window.WebMidi = WebMidi |
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