зеркало из https://github.com/mozilla/gecko-dev.git
69 строки
1.8 KiB
HTML
69 строки
1.8 KiB
HTML
<!DOCTYPE HTML>
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<html>
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<head>
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<title>Test AudioParam.setValueCurveAtTime twice</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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function linearInterpolate(t0, v0, t1, v1, t)
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{
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return v0 + (v1 - v0) * ((t - t0) / (t1 - t0));
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}
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var T0 = 0;
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var gTest = {
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length: 2048,
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numberOfChannels: 1,
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createGraph: function(context) {
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var curve2 = new Float32Array(100);
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for (var i = 0; i < 100; ++i) {
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curve2[i] = Math.sin(220 * 6 * Math.PI * i / context.sampleRate);
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}
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var source = context.createConstantSource();
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var gain = context.createGain();
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gain.gain.setValueCurveAtTime(curve2, T0, this.duration/2);
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//Set a different curve from the first one
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gain.gain.setValueCurveAtTime(this.curve, T0, this.duration);
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source.connect(gain);
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source.start(0);
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return gain;
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},
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createExpectedBuffers: function(context) {
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this.duration = 1024 / context.sampleRate;
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this.curve = new Float32Array(100);
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for (var i = 0; i < 100; ++i) {
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this.curve[i] = Math.sin(440 * 2 * Math.PI * i / context.sampleRate);
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}
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var expectedBuffer = context.createBuffer(1, 2048, context.sampleRate);
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for (var i = 0; i < 2048; ++i) {
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step = 1024.0/99.0;
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var current = Math.floor(i / step);
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var next = current + 1;
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if (next < this.curve.length) {
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expectedBuffer.getChannelData(0)[i] = linearInterpolate(current*step, this.curve[current], next*step, this.curve[next], i);
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} else {
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expectedBuffer.getChannelData(0)[i] = this.curve[99];
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}
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}
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return expectedBuffer;
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},
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};
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runTest();
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</script>
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</pre>
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</body>
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</html>
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