content/media/webaudio/test/test_waveShaper.html@6474c204b198
content/media/webaudio/test/test_waveShaper.html
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
1 <!DOCTYPE HTML>
2 <html>
3 <head>
4 <title>Test WaveShaperNode with no curve</title>
5 <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
6 <script type="text/javascript" src="webaudio.js"></script>
7 <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
8 </head>
9 <body>
10 <pre id="test">
11 <script class="testbody" type="text/javascript">
13 var gTest = {
14 length: 4096,
15 numberOfChannels: 1,
16 createGraph: function(context) {
17 var source = context.createBufferSource();
18 source.buffer = this.buffer;
20 var shaper = context.createWaveShaper();
21 shaper.curve = this.curve;
23 source.connect(shaper);
25 source.start(0);
26 return shaper;
27 },
28 createExpectedBuffers: function(context) {
29 this.buffer = context.createBuffer(1, 4096, context.sampleRate);
30 for (var i = 1; i < 4095; ++i) {
31 this.buffer.getChannelData(0)[i] = 2 * (i / 4096) - 1;
32 }
33 // Two out of range values
34 this.buffer.getChannelData(0)[0] = -2;
35 this.buffer.getChannelData(0)[4095] = 2;
37 this.curve = new Float32Array(2048);
38 for (var i = 0; i < 2048; ++i) {
39 this.curve[i] = Math.sin(100 * Math.PI * (i + 1) / context.sampleRate);
40 }
42 var expectedBuffer = context.createBuffer(1, 4096, context.sampleRate);
43 for (var i = 1; i < 4095; ++i) {
44 var input = this.buffer.getChannelData(0)[i];
45 var index = Math.floor(this.curve.length * (input + 1) / 2);
46 index = Math.max(0, Math.min(this.curve.length - 1, index));
47 expectedBuffer.getChannelData(0)[i] = this.curve[index];
48 }
49 expectedBuffer.getChannelData(0)[0] = this.curve[0];
50 expectedBuffer.getChannelData(0)[4095] = this.curve[2047];
51 return expectedBuffer;
52 },
53 };
55 runTest();
57 </script>
58 </pre>
59 </body>
60 </html>
