зеркало из https://github.com/mozilla/gecko-dev.git
101 строка
3.3 KiB
HTML
101 строка
3.3 KiB
HTML
<!DOCTYPE HTML>
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<html>
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<head>
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<title>Test PeriodicWave disableNormalization Parameter</title>
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<script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
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<script type="text/javascript" src="webaudio.js"></script>
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<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
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</head>
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<body>
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<pre id="test">
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<script class="testbody" type="text/javascript">
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SimpleTest.waitForExplicitFinish();
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// We create PerodicWave instances containing two tones and compare it to
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// buffers created directly in JavaScript by adding the two waves together.
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// Two of the PeriodicWaves are normalized, the other is not. This test is
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// a modification of test_periodicWave.html.
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//
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// These constants are borrowed from test_periodicWave.html and modified
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// so that the realPeak (which is the normalization factor) will be small
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// enough that the errors are within the bounds for the test.
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const realMax = 99;
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var real = new Float32Array(realMax + 1);
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real[1] = 2.0; // fundamental
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real[realMax] = 0.25;
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const realPeak = real[1] + real[realMax];
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const realFundamental = 19.0;
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const testLength = 4096;
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addLoadEvent(function() {
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runTest();
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});
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var gTest = {
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createGraph: function(context) {
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var merger = context.createChannelMerger();
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var osc0 = context.createOscillator();
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var osc1 = context.createOscillator();
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var osc2 = context.createOscillator();
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osc0.setPeriodicWave(context.
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createPeriodicWave(real,
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new Float32Array(real.length),
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{disableNormalization: false}));
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osc1.setPeriodicWave(context.
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createPeriodicWave(real,
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new Float32Array(real.length)));
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osc2.setPeriodicWave(context.
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createPeriodicWave(real,
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new Float32Array(real.length),
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{disableNormalization: true}));
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osc0.frequency.value = realFundamental;
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osc1.frequency.value = realFundamental;
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osc2.frequency.value = realFundamental;
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osc0.start();
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osc1.start();
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osc2.start();
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osc0.connect(merger, 0, 0);
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osc1.connect(merger, 0, 1);
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osc2.connect(merger, 0, 2);
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return merger;
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},
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createExpectedBuffers: function(context) {
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var buffer = context.createBuffer(3, testLength, context.sampleRate);
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for (var i = 0; i < buffer.length; ++i) {
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buffer.getChannelData(0)[i] = 1.0 / realPeak *
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(real[1] * Math.cos(2 * Math.PI * realFundamental * i /
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context.sampleRate) +
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real[realMax] * Math.cos(2 * Math.PI * realMax * realFundamental * i /
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context.sampleRate));
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buffer.getChannelData(1)[i] = buffer.getChannelData(0)[i];
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// TODO: We need to scale by a factor of two to make the results work
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// out here. This seems suspicious, see Bug 1266737.
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buffer.getChannelData(2)[i] = 2.0 *
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(real[1] * Math.cos(2 * Math.PI * realFundamental * i /
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context.sampleRate) +
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real[realMax] * Math.cos(2 * Math.PI * realMax * realFundamental * i /
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context.sampleRate));
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}
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return buffer;
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},
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'numberOfChannels': 3,
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};
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</script>
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</pre>
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</body>
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</html>
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