/
demo4.html
161 lines (134 loc) · 4.99 KB
/
demo4.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
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script src="WAVE.js"></script>
<script>
function onDragOver(event){
event.preventDefault();
}
function onDrop(event){
onAddFile(event);
event.preventDefault();
}
function onAddFile(event) {
var files;
var reader = new FileReader();
if(event.target.files){
files = event.target.files;
}else{
files = event.dataTransfer.files;
}
if (!files[0]) return;
reader.onload = function (event) {
try{
var wav = new TWaveFormat(new Uint8Array(reader.result));
var str = "File loaded : " + wav.Analyst.WaveFomat.wBitsPerSample + "bit ";
str += wav.Analyst.WaveFomat.nSamplesPerSec + "Hz ";
if(wav.Analyst.WaveFomat.nChannels == 1){
str += " Mono ";
}else{
str += " Stereo ";
}
str += Math.round(wav.Analyst.time)/1000 + "s";
document.getElementById("msg").innerHTML =str;
var speed = parseInt(document.getElementById("lst_speed").value,10) /100;
try{
var data = wav.getData();
var frequency = wav.Analyst.WaveFomat.nSamplesPerSec;
var bits = wav.Analyst.WaveFomat.wBitsPerSample;
// Speed up
if(speed >= 1){
// Size of 1 channel (bps / bits + α)
// ( 1チャンネルのサイズ )
var size = (frequency * (bits * 1) * wav.Analyst.time / 1000) / bits / speed;
var tmpL = new Array(Math.floor(size));
for (var i=0;i< tmpL.length; i++){
tmpL[i] = data.L[Math.floor(i * speed)];
}
data.L = tmpL;
if (data.R.length != 0){
var tmpR = new Array(tmpL.length);
for (var i=0;i< tmpL.length; i++){
tmpR[i] = data.R[Math.floor(i * speed)];
}
data.R = tmpR;
}
// Speed down
}else{
speed = speed + (1);
var size = (frequency * (bits * 1) * wav.Analyst.time / 1000) / bits * speed;
var tmpL = new Array(Math.floor(size));
for (var i=0;i< tmpL.length; i++){
tmpL[i] = data.L[Math.floor(i / speed)];
}
data.L = tmpL;
if (data.R.length != 0){
var tmpR = new Array(tmpL.length);
for (var i=0;i< tmpL.length; i++){
tmpR[i] = data.R[Math.floor(i / speed)];
}
data.R = tmpR;
}
}
// Save
var F = wav.WriteStream(wav.Analyst.WaveFomat.wBitsPerSample, data,
wav.Analyst.WaveFomat.nSamplesPerSec);
F.SaveToFile("test.wav","audio/wav");
}catch(e){
alert("Could not acquire waveform data. (unsupported format)");
console.error(e);
}
}catch(e){
alert(e);
console.error(e);
}
};
if (files[0]){
reader.readAsArrayBuffer(files[0]);
document.getElementById("inputfile").value = "";
}
}
</script>
</head>
<body ondrop="onDrop(event);" ondragover="onDragOver(event);">
<h1>DEMO4 "Effect - Speed"</h1>
<form>
<table>
<tr><th>Wave File</th><td><input type="file" id="inputfile" accept="audio/wav" onchange="onAddFile(event);"></td></tr>
</table>
<p></p>
<table>
<tr><th>Speed</th>
<td><select id="lst_speed">
<option value="75">25%</option>
<option value="50">50%</option>
<option value="45">55%</option>
<option value="40">60%</option>
<option value="35">65%</option>
<option value="30">70%</option>
<option value="25">75%</option>
<option value="20">80%</option>
<option value="15">85%</option>
<option value="10">90%</option>
<option value="5" >95%</option>
<option value="100" selected="selected">100%</option>
<option value="105">105%</option>
<option value="110">110%</option>
<option value="115">115%</option>
<option value="120">120%</option>
<option value="125">125%</option>
<option value="130">130%</option>
<option value="135">135%</option>
<option value="140">140%</option>
<option value="145">145%</option>
<option value="150">150%</option>
<option value="175">175%</option>
<option value="200">200%</option>
<option value="300">300%</option>
</select></td></tr>
</table>
<p id="msg"></p>
</form>
</body>
</html>