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import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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Roy Tam 2018-01-19 03:59:58 +08:00
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dom/media/webaudio/test/test_waveShaperGain.html Normal file
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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>Test that WaveShaperNode doesn't corrupt its inputs when the gain is !=
1.0 (bug 1203616)</title>
<script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body>
<script class="testbody" type="text/javascript">
SimpleTest.waitForExplicitFinish();
var samplerate = 44100;
var context = new OfflineAudioContext(1, 44100, samplerate);
var dc = context.createBufferSource();
var buffer = context.createBuffer(1, 1, samplerate);
buffer.getChannelData(0)[0] = 1.0;
dc.buffer = buffer;
var gain = context.createGain();
var ws2 = context.createWaveShaper();
var ws = [];
// No-op waveshaper curves.
for (var i = 0; i < 2; i++) {
ws[i] = context.createWaveShaper();
var curve = new Float32Array(2);
curve[0] = -1.0;
curve[1] = 1.0;
ws[i].curve = curve;
ws[i].connect(context.destination);
gain.connect(ws[i]);
}
dc.connect(gain);
dc.start();
gain.gain.value = 0.5;
context.startRendering().then(buffer => {
document.querySelector("pre").innerHTML = buffer.getChannelData(0)[0];
ok(buffer.getChannelData(0)[0] == 1.0, "Volume was handled properly");
context = new OfflineAudioContext(1, 100, samplerate);
var oscillator = context.createOscillator();
var gain = context.createGain();
var waveShaper = context.createWaveShaper();
oscillator.start(0);
oscillator.connect(gain);
// to silence
gain.gain.value = 0;
gain.connect(waveShaper);
// convert all signal into 1.0. The non unity values are to detect the use
// of uninitialized buffers (see Bug 1283910).
waveShaper.curve = new Float32Array([ 0.5, 0.5, 0.5, 0.5, 0.5, 1, 1, 0.5, 0.5, 0.5, 0.5, 0.5 ]);
waveShaper.connect(context.destination);
context.startRendering().then((buffer) => {
var result = buffer.getChannelData(0);
ok(result.every(x => x === 1), "WaveShaper handles zero gain properly");
SimpleTest.finish();
});
});
</script>
<pre>
</pre>
</body>