зеркало из https://github.com/mozilla/gecko-dev.git
61 строка
1.7 KiB
HTML
61 строка
1.7 KiB
HTML
<!DOCTYPE HTML>
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<html>
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<head>
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<title>Test WaveShaperNode with no curve</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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var gTest = {
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length: 4096,
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numberOfChannels: 1,
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createGraph: function(context) {
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var source = context.createBufferSource();
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source.buffer = this.buffer;
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var shaper = new WaveShaperNode(context);
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shaper.curve = this.curve;
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source.connect(shaper);
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source.start(0);
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return shaper;
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},
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createExpectedBuffers: function(context) {
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this.buffer = context.createBuffer(1, 4096, context.sampleRate);
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for (var i = 1; i < 4095; ++i) {
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this.buffer.getChannelData(0)[i] = 2 * (i / 4096) - 1;
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}
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// Two out of range values
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this.buffer.getChannelData(0)[0] = -2;
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this.buffer.getChannelData(0)[4095] = 2;
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this.curve = new Float32Array(2048);
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for (var i = 0; i < 2048; ++i) {
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this.curve[i] = Math.sin(100 * Math.PI * (i + 1) / context.sampleRate);
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}
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var expectedBuffer = context.createBuffer(1, 4096, context.sampleRate);
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for (var i = 1; i < 4095; ++i) {
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var input = this.buffer.getChannelData(0)[i];
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var index = Math.floor(this.curve.length * (input + 1) / 2);
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index = Math.max(0, Math.min(this.curve.length - 1, index));
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expectedBuffer.getChannelData(0)[i] = this.curve[index];
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}
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expectedBuffer.getChannelData(0)[0] = this.curve[0];
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expectedBuffer.getChannelData(0)[4095] = this.curve[2047];
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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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