gustable.github.io/eq.html at master · gustable/gustable.github.io · GitHub

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
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title>three.js Graphic EQ</title>
    <style>
        body {
            /* set margin to 0 and overflow to hidden, to go fullscreen */
            margin: 0;
            overflow: hidden;
        }
        div#mp3_player{ width:500px; height:60px; background:#000; padding:5px; margin:50px auto; }
        div#mp3_player > div > audio{  width:500px; background:#000; float:left;  }
        div#mp3_player > canvas{ width:500px; height:30px; background:#002D3C; float:left; }
        div#container > canvas{ width:800px; height:600px; background:#ffffff; float:left; }
    </style>
</head>

<body>
    <script src="docs/libraries/three.js"></script>
    <script src="docs/libraries/OrbitControls.js"></script>
    <script src="docs/libraries/stats.js"></script>

    <div id="container">
    <div id="mp3_player">
    <div id="audio_box">
    </div>


<script type="text/javascript">
/*** base Graphic EQ code by srchea ***/
var camera, scene, renderer;
var controls;
var listener;
var document;
var audio = new Audio();

// Establish all variables that your Analyser will use
var source, mainContext, filterCtx, mainBuffer, mainGain, analyser, bandFilter;

scene = new THREE.Scene();

function audioElement(){
    // Create a new instance of an audio object and adjust some of its properties
    audio.src = "docs/musaky.mp3";
    audio.controls = true;
    audio.loop = true;
    audio.autoplay = true;

    mainContext = new (window.AudioContext || window.webkitAudioContext)();
    filterCtx = new (window.AudioContext || window.webkitAudioContext)();

    bandFilter = filterCtx.createBiquadFilter(); // BiquadFilterNode
    analyser = filterCtx.createAnalyser(); // AnalyserNode
    analyser.fftSize = 16384; //or 32768

    mainBuffer = mainContext.createBuffer(2, mainContext.sampleRate * 2.221, mainContext.sampleRate);
    mainGain = mainContext.createGain();

    //USE THE copyFromChannel() method of the AudioBuffer interface into another
    //buffer instead of sources
    source = mainContext.createMediaElementSource(audio);
    sourceB = mainContext.createBufferSource();
    sourceB.buffer = mainBuffer;
    //source.connect(mainContext.destination);

    //Merge the two channels into one for graphic EQ processing
    merger = mainContext.createChannelMerger(2);
    source.connect(merger);


    var source0 = clone(source);
    var bandFilter0 = bandFilter;
    source0.connect(bandFilter0);
    setBqFreqBand(9);
    var analyser0 = analyser;
    bandFilter0.connect(analyser0);

    var source1 = clone(source);
    var bandFilter1 = bandFilter;
    source1.connect(bandFilter1);
    setBqFreqBand(8);
    var analyser1 = analyser;
    bandFilter1.connect(analyser1);

    var source2 = clone(source);
    var bandFilter2 = bandFilter;
    source2.connect(bandFilter2);
    setBqFreqBand(7);
    var analyser2 = analyser;
    bandFilter2.connect(analyser2);

    var source3 = clone(source);
    var bandFilter3 = bandFilter;
    source3.connect(bandFilter3);
    setBqFreqBand(6);
    var analyser3 = analyser;
    bandFilter3.connect(analyser3);

    var source4 = clone(source);
    var bandFilter4 = bandFilter;
    source4.connect(bandFilter4);
    setBqFreqBand(5);
    var analyser4 = analyser;
    bandFilter4.connect(analyser4);

    var source5 = clone(source);
    var bandFilter5 = bandFilter;
    source5.connect(bandFilter5);
    setBqFreqBand(4);
    var analyser5 = analyser;
    bandFilter5.connect(analyser5);

    var source6 = clone(source);
    var bandFilter6 = bandFilter;
    source6.connect(bandFilter6);
    setBqFreqBand(3);
    var analyser6 = analyser;
    bandFilter6.connect(analyser6);

    var source7 = clone(source);
    var bandFilter7 = bandFilter;
    source7.connect(bandFilter7);
    setBqFreqBand(2);
    var analyser7 = analyser;
    bandFilter7.connect(analyser7);

    var source8 = clone(source);
    var bandFilter8 = bandFilter;
    source8.connect(bandFilter8);
    setBqFreqBand(1);
    var analyser8 = analyser;
    bandFilter8.connect(analyser8);

    var source9 = clone(source);
    var bandFilter9 = bandFilter;
    source9.connect(bandFilter9);
    setBqFreqBand(0);
    var analyser9 = analyser;
    bandFilter9.connect(analyser9);

    mainBuffer.connect(mainGain);
    mainGain.connect(mainContext.destination);
    mainGain.gain.setValueAtTime(0.333, mainContext.currentTime);
    //return analyser;
}


function getBqFreqBands(k){
    // Set the number of frequency bands for the EQ
    var freqBands = new Float32Array(10);
    //freqBands[0] = 0;  //Placeholder for ease of iteration above
    if (k == 0) {
        freqBands[k] = 31.25; }
    else {
        freqBands[k] = freqBands[k-1] * 2; }
    var freq = freqBands[k];
    console.log(freq); // log frequency bands
    return freq;
}

function setBqFreqBand(f){
    bandFilter.type = "bandpass";
    bandFilter.frequency.value = getBqFreqBands(f);
    bandFilter.Q.value = 29.7;
}

function freqData(m, aCtx){
    var bufferLength = aCtx.frequencyBinCount;
    var dataArray = new Float32Array(bufferLength);
    ('analyser' + m).getFloatFrequencyData(dataArray);
    var v = ( dataArray.reduce(function(acc, val) { return acc + val; }, 0) ) / 2;
    console.log(v*0.1);
    return v;
}

function setRect(n, analCtx){
    var geometry = new THREE.CubeGeometry(10, -(freqData(n, analCtx)*0.1), 10);
    var material = new THREE.MeshBasicMaterial({
        color: 0x7777ff});
    var rect = new THREE.Mesh(geometry, material);
    rect.name = "rect-" + scene.children.length;
    rect.translateZ(n * 12.0);
    scene.add(rect);
}

function clearScene(scene) {
    var j;
    for (j = scene.children.length - 1; j >= 0; j--) {
        var obj = scene.children[j];
        if (obj instanceof THREE.Mesh && obj.type == "Mesh") {
            obj.geometry.dispose();
            obj.geometry = null;
            obj.material.dispose();
            obj.material = null;
            scene.remove( obj );
            obj = null;
        }
        else {
            if (obj.children !== undefined) {
                while (obj.children.length > 0) {
                    this.clearScene(obj.children[0]);
                    obj.remove(obj.children[0]);
                }
            }
        }
    }
}

function init() {
    camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 100, 1000 );
    camera.position.set( 250, 250, 250 );

    // create an AudioListener and add it to the camera
    listener = new THREE.AudioListener();
    camera.add( listener );

    audioElement();

    renderer = new THREE.WebGLRenderer();
    renderer.setSize( window.innerWidth, window.innerHeight );

    // show cubes in an array
    var i;
    for(i=0; i<10; i++) {
        setRect(i, filterCtx);
        console.log(i);
    }

    // show axes in the screen
    var axes = new THREE.AxesHelper(2);
    scene.add(axes);

    var ambientLight = new THREE.AmbientLight(0x7777ff);
    scene.add(ambientLight);

    controls = new THREE.OrbitControls(camera);
    controls.rotateSpeed = 4;
}

function frameLooper() {
    //renderer.autoClear = false;
    clearScene(scene);
    var l;
    for(l=0; l<10; l++) {
        setRect(l, analysisCtx);
    }
    requestAnimationFrame( frameLooper );
    controls.update();
    renderer.render( scene, camera );
}

init();
controls.update();
renderer.render(scene, camera);
frameLooper();

document.getElementById('audio_box').appendChild(audio);
document.getElementById('container').appendChild(renderer.domElement);


</script>

</div>
</body>
</html>