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63 lines
1.7 KiB
HTML
63 lines
1.7 KiB
HTML
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<!DOCTYPE HTML>
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<html>
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<head>
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<title>Test DelayNode with a GainNode</title>
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<script type="text/javascript" src="/tests/SimpleTest/SimpleTest.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 src="webaudio.js" type="text/javascript"></script>
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<script class="testbody" type="text/javascript">
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SimpleTest.waitForExplicitFinish();
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addLoadEvent(function() {
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SpecialPowers.setBoolPref("media.webaudio.enabled", true);
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var context = new AudioContext();
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var buffer = context.createBuffer(1, 2048, context.sampleRate);
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for (var i = 0; i < 2048; ++i) {
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buffer.getChannelData(0)[i] = Math.sin(440 * 2 * Math.PI * i / context.sampleRate);
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}
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var expectedBuffer = context.createBuffer(1, 2048 * 2, context.sampleRate);
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for (var i = 2048; i < 2048 * 2; ++i) {
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expectedBuffer.getChannelData(0)[i] = buffer.getChannelData(0)[i - 2048] / 2;
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}
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var destination = context.destination;
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var source = context.createBufferSource();
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var delay = context.createDelay();
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source.buffer = buffer;
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var gain = context.createGain();
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gain.gain.value = 0.5;
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source.connect(gain);
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gain.connect(delay);
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var sp = context.createScriptProcessor(2048 * 2, 1);
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delay.connect(sp);
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sp.connect(destination);
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// Delay the source stream by 2048 frames
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delay.delayTime.value = 2048 / context.sampleRate;
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source.start(0);
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sp.onaudioprocess = function(e) {
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is(e.inputBuffer.numberOfChannels, 1, "Correct input channel count");
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compareBuffers(e.inputBuffer.getChannelData(0), expectedBuffer.getChannelData(0));
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sp.onaudioprocess = null;
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SpecialPowers.clearUserPref("media.webaudio.enabled");
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SimpleTest.finish();
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};
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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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