-
Notifications
You must be signed in to change notification settings - Fork 1
/
index.html
215 lines (168 loc) · 6.75 KB
/
index.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
<!doctype html>
<html lang="en">
<meta charset="utf-8">
<title>Laurel</title>
<style>
input[type=range] { width: 500px; }
canvas { border: 1px solid #ccc; }
.github-corner {
border-bottom: 0;
position: fixed;
right: 0;
text-decoration: none;
top: 0;
z-index: 1
}
.github-corner:hover .octo-arm {
animation: a .56s ease-in-out
}
.github-corner svg {
color: #fff;
fill: #000; /* github-corner color*/
height: 80px;
width: 80px
}
</style>
<script src="laurel_base64.js"></script>
<script src="PitchShifter.js"></script>
<script>
var rate = 1.0;
var clear = false;
function restart(buffer) {
source = audioContext.createBufferSource();
source.buffer = buffer;
source.onended = function () { restart(buffer); }
source.playbackRate.value = rate;
source.connect(lBand);
source.connect(mBand);
source.connect(hBand);
source.start();
dx = 0;
}
function init() {
AudioContext = window.AudioContext || window.webkitAudioContext;
audioContext = new AudioContext();
audioContext.suspend();
data = Uint8Array.from(atob(laurel_base64), c => c.charCodeAt(0));
analyser = audioContext.createAnalyser();
analyser.fftSize = 512;
analyser.smoothingTimeConstant = 0;
audioContext.decodeAudioData(data.buffer, function(buffer) { restart(buffer); });
initFilters(audioContext);
scriptNode = audioContext.createScriptProcessor(256, 1, 1);
scriptNode.connect(sum);
scriptNode.onaudioprocess = draw;
//setInterval(function(){ draw(); }, 1);
shifter.connect(analyser);
shifter.bypass = true;
}
var dx = 0;
function draw() {
if (audioContext.state=='suspended')
return;
canvas = document.getElementById("analyser");
canvasContext = canvas.getContext('2d');
data = new Uint8Array(analyser.frequencyBinCount);
analyser.getByteFrequencyData(data);
var bandHeight = canvas.height / data.length;
if (clear) {
clear = false;
canvasContext.clearRect(0, 0, canvas.width, canvas.height);
}
for (var i = 0, y = canvas.height - 1; i < data.length; i++, y -= bandHeight) {
var b = 0xff-data[i]
var color = b | (b<<8) | (b<<16);
canvasContext.fillStyle = '#' + color.toString(16);
canvasContext.fillRect(dx, y, 1, -bandHeight);
}
dx = dx>=canvas.width ? 0 : dx+1;
}
function initFilters(audioContext, source) {
var gainDb = -40.0;
var bandSplit = [360,3600];
hBand = audioContext.createBiquadFilter();
hBand.type = "lowshelf";
hBand.frequency.value = bandSplit[0];
hBand.gain.value = gainDb;
var hInvert = audioContext.createGain();
hInvert.gain.value = -1.0;
mBand = audioContext.createGain();
lBand = audioContext.createBiquadFilter();
lBand.type = "highshelf";
lBand.frequency.value = bandSplit[1];
lBand.gain.value = gainDb;
var lInvert = audioContext.createGain();
lInvert.gain.value = -1.0;
hBand.connect(hInvert);
lBand.connect(lInvert);
hInvert.connect(mBand);
lInvert.connect(mBand);
lGain = audioContext.createGain();
mGain = audioContext.createGain();
hGain = audioContext.createGain();
lBand.connect(lGain);
mBand.connect(mGain);
hBand.connect(hGain);
sum = audioContext.createGain();
lGain.connect(sum);
mGain.connect(sum);
hGain.connect(sum);
shifter = new PitchShifter(audioContext);
sum.connect(shifter);
shifter.connect(audioContext.destination);
}
function toggle_play(ctrl) {
ctrl.value = audioContext.state!='suspended' ? "Click To Play" : "Click To Pause";
audioContext.state=='suspended' ? audioContext.resume() : audioContext.suspend();
}
function change(value, type, ctrl) {
value = parseFloat(value);
document.getElementById(type).innerText = value.toFixed(2);
switch(type) {
case 'rate': rate = source.playbackRate.value = value; break;
case 'pitch': shifter.pitchRatio = value; shifter.bypass = value==1.0; break;
case 'lowGain': lGain.gain.value = value; break;
case 'midGain': mGain.gain.value = value; break;
case 'highGain': hGain.gain.value = value; break;
}
}
function reset_form(form) {
for (c of ['pitch','rate','lowGain','midGain','highGain']) {
ctrl = document.getElementById(c);
change(1, c);
ctrl.value = 1.0;
}
shifter.bypass = true;
form.reset();
clear = true;
}
</script>
<body onload=init()>
<h2>Laurel</h2>
<p>Yanny-Laurel debate-related Web Audio API pitch shifter</p>
<form>
<input type=button id=play value="Click To Play" onclick="toggle_play(this)">
<input type=button value="Reset Settings" onclick="reset_form(this.form)"><br><br>
<input type=range value=1 step=0.01 min=0.5 max=1.5 oninput="change(this.value,'pitch')">
<label>Pitch <span id="pitch">1.00</span></label></input>
<br>
<input type=range value=1 step=0.01 min=0.5 max=1.5 oninput="change(this.value,'rate')">
<label>Rate <span id="rate">1.00</span></label></input><br>
<input type=range value=1 step=0.01 min=0 max=1 oninput="change(this.value, 'lowGain')">
<label>Low Gain <span id="lowGain">1.00</span></label></input><br>
<input type=range value=1 step=0.01 min=0 max=1 oninput="change(this.value, 'midGain')">
<label>Mid Gain <span id="midGain">1.00</span></label></input><br>
<input type=range value=1 step=0.01 min=0 max=1 oninput="change(this.value, 'highGain')">
<label>High Gain <span id="highGain">1.00</span></label></input><br>
</form>
<h3>Spectrogram</h3>
<canvas width=300 height=300 id=analyser></canvas>
<a aria-label="View source on Github" class="github-corner" href="https://github.com/joric/laurel">
<svg viewbox="0 0 250 250">
<path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path>
<path class="octo-arm" d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2" fill="currentColor" style="transform-origin: 130px 106px;"></path>
<path class="octo-body" d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z" fill="currentColor"></path>
</svg>
</a>
</body>
</html>