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midi-scratch.js
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midi-scratch.js
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//This is the Scratch port of the Turbowarp MIDI extension, which is not yet officially published.
let midiInputDevices = [];
let midiDeviceInfo = [];
let notesOn = [];
let noteVelocities = [];
let lastNotePressed = 0;
let lastNoteReleased = 0;
if (navigator.requestMIDIAccess) {
navigator.requestMIDIAccess().then(onSuccess, onError);
function onSuccess(midiAccess) {
midiAccess.onstatechange = (event) => {
if (event.port.state == "connected") {
midiInputDevices.push([`[id: "${event.port.id}"` + ` name: "${event.port.name}"]`]);
midiDeviceInfo.push([event.port.id, event.port.name]);
} else if (event.port.state == "disconnected") {
midiInputDevices.splice([`[id: "${event.port.id}"` + ` name: "${event.port.name}"]`], 1);
midiDeviceInfo.splice([event.port.id, event.port.name]);
}
};
function onMIDIMessage(event) {
const [status, note, velocity] = event.data;
const command = status & 0xF0;
if (command === 0x90 && velocity > 0) {
notesOn.push(note);
noteVelocities.push([note, velocity]);
lastNotePressed = note;
vm.runtime.startHats('midi_whenNotePressed');
} else if (command === 0x80 || (command === 0x90 && velocity === 0)) {
lastNoteReleased = note;
notesOn.splice(notesOn.indexOf(note), 1);
noteVelocities.splice(noteVelocities.findIndex(subArray => subArray[0] === note), 1);
vm.runtime.startHats('midi_whenNoteReleased');
} else {
console.log(`Other MIDI Message: Status=${status}, Note=${note}, Velocity=${velocity}, Timestamp ${event.timeStamp}`);
}
}
midiAccess.inputs.forEach((entry) => {
entry.onmidimessage = onMIDIMessage;
});
}
function onError(err) {
alert("MIDI Access Error:", err);
throw new Error("MIDI Access Error:", err);
}
} else {
alert("MIDI is not supported on this browser.");
throw new Error("MIDI is not supported on this browser.");
}
class MIDI {
constructor (runtime) {
/**
* Store this for later communication with the Scratch VM runtime.
* If this extension is running in a sandbox then `runtime` is an async proxy object.
* @type {Runtime}
*/
this.runtime = runtime;
}
getInfo() {
return {
id: 'midi',
name: 'MIDI',
blocks: [
{
opcode: 'MIDIinputDevices',
blockType: 'reporter',
text: 'connected MIDI input devices',
disableMonitor: true,
},
{
opcode: 'midiDeviceInfo',
blockType: 'reporter',
text: '[info] of MIDI device [number]',
arguments: {
info: {
type: 'string',
defaultValue: 'name',
menu: 'infoMenu',
},
number: {
type: 'number',
defaultValue: 0,
}
}
},
'---',
{
opcode: 'whenNotePressed',
blockType: 'event',
text: 'when any note pressed',
isEdgeActivated: false,
shouldRestartExistingThreads: true,
},
{
opcode: 'whenNoteReleased',
blockType: 'event',
text: 'when any note released',
isEdgeActivated: false,
shouldRestartExistingThreads: true,
},
{
opcode: 'noteOn',
blockType: 'Boolean',
text: 'is note [note] on?',
arguments: {
note: {
type: 'note',
defaultValue: 60,
}
}
},
{
opcode: 'noteVelocity',
blockType: 'reporter',
text: 'velocity of note [note]',
arguments: {
note: {
type: 'note',
defaultValue: 60,
}
}
},
{
opcode: 'activeNotes',
blockType: 'reporter',
text: 'all active notes',
disableMonitor: true,
},
{
opcode: 'lastNotePressed',
blockType: 'reporter',
text: 'last note pressed',
disableMonitor: true,
},
{
opcode: 'lastNoteReleased',
blockType: 'reporter',
text: 'last note released',
disableMonitor: true,
}
],
menus: {
infoMenu: {
acceptReporters: false,
items: ["name", "id"]
}
}
};
}
MIDIinputDevices() {
return midiInputDevices;
}
midiDeviceInfo(args) {
if (midiInputDevices[args.number] != null) {
return midiDeviceInfo[args.number][(args.info == "id") ? 0 : 1];
} else {
return;
}
}
noteOn(args) {
return notesOn.includes(Number(args.note));
}
noteVelocity(args) {
if (notesOn.includes(args.note) && noteVelocities.find(subArray => subArray[0] === args.note)[1] !== undefined) {
return noteVelocities.find(subArray => subArray[0] === args.note)[1];
}
}
activeNotes() {
return notesOn;
}
lastNotePressed() {
return lastNotePressed;
}
lastNoteReleased() {
return lastNoteReleased;
}
}
//Copied from the 3D extension on scratch.
// ============== globalize vm and load extension ===============
function findReactComponent(element) {
let fiber = element[Object.keys(element).find(key => key.startsWith("__reactInternalInstance$"))];
if (fiber == null) return null;
const go = fiber => {
let parent = fiber.return;
while (typeof parent.type == "string") {
parent = parent.return;
}
return parent;
};
fiber = go(fiber);
while(fiber.stateNode == null) {
fiber = go(fiber);
}
return fiber.stateNode;
}
window.vm = findReactComponent(document.getElementsByClassName("stage-header_stage-size-row_14N65")[0]).props.vm;
(function() {
var extensionInstance = new MIDI(window.vm.extensionManager.runtime)
var serviceName = window.vm.extensionManager._registerInternalExtension(extensionInstance)
window.vm.extensionManager._loadedExtensions.set(extensionInstance.getInfo().id, serviceName)
})()