1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/webaudio/test/test_waveShaper.html Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,60 @@
1.4 +<!DOCTYPE HTML>
1.5 +<html>
1.6 +<head>
1.7 + <title>Test WaveShaperNode with no curve</title>
1.8 + <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
1.9 + <script type="text/javascript" src="webaudio.js"></script>
1.10 + <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
1.11 +</head>
1.12 +<body>
1.13 +<pre id="test">
1.14 +<script class="testbody" type="text/javascript">
1.15 +
1.16 +var gTest = {
1.17 + length: 4096,
1.18 + numberOfChannels: 1,
1.19 + createGraph: function(context) {
1.20 + var source = context.createBufferSource();
1.21 + source.buffer = this.buffer;
1.22 +
1.23 + var shaper = context.createWaveShaper();
1.24 + shaper.curve = this.curve;
1.25 +
1.26 + source.connect(shaper);
1.27 +
1.28 + source.start(0);
1.29 + return shaper;
1.30 + },
1.31 + createExpectedBuffers: function(context) {
1.32 + this.buffer = context.createBuffer(1, 4096, context.sampleRate);
1.33 + for (var i = 1; i < 4095; ++i) {
1.34 + this.buffer.getChannelData(0)[i] = 2 * (i / 4096) - 1;
1.35 + }
1.36 + // Two out of range values
1.37 + this.buffer.getChannelData(0)[0] = -2;
1.38 + this.buffer.getChannelData(0)[4095] = 2;
1.39 +
1.40 + this.curve = new Float32Array(2048);
1.41 + for (var i = 0; i < 2048; ++i) {
1.42 + this.curve[i] = Math.sin(100 * Math.PI * (i + 1) / context.sampleRate);
1.43 + }
1.44 +
1.45 + var expectedBuffer = context.createBuffer(1, 4096, context.sampleRate);
1.46 + for (var i = 1; i < 4095; ++i) {
1.47 + var input = this.buffer.getChannelData(0)[i];
1.48 + var index = Math.floor(this.curve.length * (input + 1) / 2);
1.49 + index = Math.max(0, Math.min(this.curve.length - 1, index));
1.50 + expectedBuffer.getChannelData(0)[i] = this.curve[index];
1.51 + }
1.52 + expectedBuffer.getChannelData(0)[0] = this.curve[0];
1.53 + expectedBuffer.getChannelData(0)[4095] = this.curve[2047];
1.54 + return expectedBuffer;
1.55 + },
1.56 +};
1.57 +
1.58 +runTest();
1.59 +
1.60 +</script>
1.61 +</pre>
1.62 +</body>
1.63 +</html>
