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2 Commits

Author SHA1 Message Date
8b6f2e2588 init backend 2021-12-02 14:56:12 -08:00
cd9363ea49 mv 2021-12-02 14:40:25 -08:00
12 changed files with 1079 additions and 174 deletions

1
.gitignore vendored Normal file
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@ -0,0 +1 @@
node_modules

17
backend/index.js Normal file
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@ -0,0 +1,17 @@
var express = require("express");
var {WebSocketServer} = require("ws");
var app = express();
var server = app.listen(924);
app.get('*', express.static("../frontend"));
var wss = new WebSocketServer({server});
wss.on("connection", (ws, req) => {
console.log(req);
ws.on("message", msg => {
console.log(msg);
});
});

882
backend/package-lock.json generated Normal file
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@ -0,0 +1,882 @@
{
"name": "server",
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}

6
backend/package.json Normal file
View File

@ -0,0 +1,6 @@
{
"dependencies": {
"express": "^4.17.1",
"ws": "^8.3.0"
}
}

View File

@ -4,10 +4,10 @@
<meta charset="utf-8">
<title>Piano | DayDun</title>
<link href="https://fonts.googleapis.com/css?family=Roboto:400,700" rel="stylesheet">
<link href="/piano/style.css" rel="stylesheet">
<script src="/piano/main.js"></script>
<script src="/piano/midiParser.js"></script>
<script src="/piano/midiPlayer.js"></script>
<link href="style.css" rel="stylesheet">
<script src="main.js"></script>
<script src="midiParser.js"></script>
<script src="midiPlayer.js"></script>
</head>
<body>
<div id="playspace">

View File

@ -638,8 +638,7 @@ class User {
}
class Networker {
constructor() {
let url = "wss://daydun.com:5012?";
constructor(url = `ws://${location.host}?`) {
url += "room=" + encodeURIComponent(decodeURIComponent(location.pathname.slice(7)));
if (localStorage.nick) {
url += "&nick=" + encodeURIComponent(localStorage.nick);
@ -692,7 +691,7 @@ class Networker {
let element = document.createElement("li");
element.addEventListener("click", (function(room) {
return function() {
window.location.pathname = "/piano/" + room;
window.location.pathname = "/" + room;
};
})(this.rooms[i].name));
let roomName = document.createElement("span");
@ -718,7 +717,7 @@ class Networker {
let element = document.createElement("li");
element.addEventListener("click", (function(room) {
return function() {
window.location.pathname = "/piano/" + room;
window.location.pathname = "/" + room;
};
})(this.rooms[i].name));
let roomName = document.createElement("span");

View File

@ -1,166 +1,166 @@
class MidiTrack {
constructor(player, chunk) {
this.player = player;
this.events = chunk.events;
this.length = 0;
for (let i=0; i< this.events.length; i++) {
this.length += this.events[i].deltaTime;
}
this.index = 0;
this.lastTime = 0;
}
parseEvent(event) {
if (event instanceof MidiVoiceEvent) {
this.player.parseEvent(event);
} else if (event instanceof MidiSetTempoEvent) {
this.player.bpm = 60000000 / event.tempo;
}
}
tick(delta) {
while(true) {
if (this.index >= this.events.length) {
break;
}
let event = this.events[this.index];
if (this.lastTime + event.deltaTime - this.player.time <= 0) {
this.lastTime += event.deltaTime;
this.parseEvent(event);
this.index++;
} else {
break;
}
}
}
}
class MidiPlayer {
constructor() {
this.tracks = [];
this.playing = false;
this.speed = 1;
this.bpm = 120;
this.time = 0;
}
loadMidi(midi) {
this.tracks = [];
this.time = 0;
this.length = 0;
this.bpm = 120;
this.midi = midi;
if (!(this.midi.chunks[0] instanceof MidiHeaderChunk)) {
throw "No header chunk";
}
let header = this.midi.chunks[0];
this.format = header.format;
if ((header.division & 0x0800) === 1) {
throw "SMPTA time format not yet supported";
} else {
this.ticksPerQuarterNote = header.division;
}
for (let i=1; i<this.midi.chunks.length; i++) {
let chunk = this.midi.chunks[i];
if (chunk instanceof MidiTrackChunk) {
let track = new MidiTrack(this, chunk);
this.length = Math.max(track.length, this.length);
this.tracks.push(track);
}
}
}
parseEvent(event) {
if (event instanceof MidiNoteOnEvent) {
if (event.channel === 9) {
return;
}
if (event.velocity === 0) {
piano.localKeyUp(event.key, false);
} else {
piano.localKeyDown(event.key, event.velocity / 127);
}
} else if (event instanceof MidiNoteOffEvent) {
if (event.channel === 9) {
return;
}
piano.localKeyUp(event.key, false);
}
}
tick(delta) {
let deltaTicks = delta / 1000 * (this.bpm / 60) * this.ticksPerQuarterNote;
this.time += deltaTicks;
switch(this.format) {
case 0:
this.tracks[0].tick(deltaTicks);
break;
case 1:
for (let i=0; i<this.tracks.length; i++) {
this.tracks[i].tick(deltaTicks);
}
break;
case 2:
// Todo
break;
}
if (this.time >= this.length) {
this.time = this.length;
this.pause();
}
}
setTime(time) {
// TODO skip notes
this.time = time;
}
play() {
if (this.playing) return;
this.playing = true;
let lastTime = Date.now();
this.interval = setInterval(() => {
let delta = Date.now() - lastTime;
lastTime = Date.now();
this.tick(delta * this.speed);
}, 1000 / 60);
}
pause() {
this.playing = false;
clearInterval(this.interval);
}
}
let midiPlayer = new MidiPlayer();
function uploadMidi() {
let input = document.createElement("input");
input.type = "file";
input.accept = "audio/midi";
input.addEventListener("change", function() {
let reader = new FileReader();
reader.addEventListener("load", function() {
let midiFile = new MidiFile(reader.result);
midiPlayer.loadMidi(midiFile);
console.log(midiFile);
});
reader.readAsArrayBuffer(input.files[0]);
});
input.click();
}
class MidiTrack {
constructor(player, chunk) {
this.player = player;
this.events = chunk.events;
this.length = 0;
for (let i=0; i< this.events.length; i++) {
this.length += this.events[i].deltaTime;
}
this.index = 0;
this.lastTime = 0;
}
parseEvent(event) {
if (event instanceof MidiVoiceEvent) {
this.player.parseEvent(event);
} else if (event instanceof MidiSetTempoEvent) {
this.player.bpm = 60000000 / event.tempo;
}
}
tick(delta) {
while(true) {
if (this.index >= this.events.length) {
break;
}
let event = this.events[this.index];
if (this.lastTime + event.deltaTime - this.player.time <= 0) {
this.lastTime += event.deltaTime;
this.parseEvent(event);
this.index++;
} else {
break;
}
}
}
}
class MidiPlayer {
constructor() {
this.tracks = [];
this.playing = false;
this.speed = 1;
this.bpm = 120;
this.time = 0;
}
loadMidi(midi) {
this.tracks = [];
this.time = 0;
this.length = 0;
this.bpm = 120;
this.midi = midi;
if (!(this.midi.chunks[0] instanceof MidiHeaderChunk)) {
throw "No header chunk";
}
let header = this.midi.chunks[0];
this.format = header.format;
if ((header.division & 0x0800) === 1) {
throw "SMPTA time format not yet supported";
} else {
this.ticksPerQuarterNote = header.division;
}
for (let i=1; i<this.midi.chunks.length; i++) {
let chunk = this.midi.chunks[i];
if (chunk instanceof MidiTrackChunk) {
let track = new MidiTrack(this, chunk);
this.length = Math.max(track.length, this.length);
this.tracks.push(track);
}
}
}
parseEvent(event) {
if (event instanceof MidiNoteOnEvent) {
if (event.channel === 9) {
return;
}
if (event.velocity === 0) {
piano.localKeyUp(event.key, false);
} else {
piano.localKeyDown(event.key, event.velocity / 127);
}
} else if (event instanceof MidiNoteOffEvent) {
if (event.channel === 9) {
return;
}
piano.localKeyUp(event.key, false);
}
}
tick(delta) {
let deltaTicks = delta / 1000 * (this.bpm / 60) * this.ticksPerQuarterNote;
this.time += deltaTicks;
switch(this.format) {
case 0:
this.tracks[0].tick(deltaTicks);
break;
case 1:
for (let i=0; i<this.tracks.length; i++) {
this.tracks[i].tick(deltaTicks);
}
break;
case 2:
// Todo
break;
}
if (this.time >= this.length) {
this.time = this.length;
this.pause();
}
}
setTime(time) {
// TODO skip notes
this.time = time;
}
play() {
if (this.playing) return;
this.playing = true;
let lastTime = Date.now();
this.interval = setInterval(() => {
let delta = Date.now() - lastTime;
lastTime = Date.now();
this.tick(delta * this.speed);
}, 1000 / 60);
}
pause() {
this.playing = false;
clearInterval(this.interval);
}
}
let midiPlayer = new MidiPlayer();
function uploadMidi() {
let input = document.createElement("input");
input.type = "file";
input.accept = "audio/midi";
input.addEventListener("change", function() {
let reader = new FileReader();
reader.addEventListener("load", function() {
let midiFile = new MidiFile(reader.result);
midiPlayer.loadMidi(midiFile);
console.log(midiFile);
});
reader.readAsArrayBuffer(input.files[0]);
});
input.click();
}

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