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59 lines
1.8 KiB
HTML
59 lines
1.8 KiB
HTML
<!DOCTYPE HTML>
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<html>
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<head>
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<title>Test OscillatorNode type change after it has started and triangle phase</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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const bufferSize = 1024;
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function startTest() {
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var ctx = new AudioContext();
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var oscillator1 = ctx.createOscillator();
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oscillator1.connect(ctx.destination);
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oscillator1.start(0);
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// Assuming the above Web Audio operations have already scheduled an event
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// to run in stable state and start the graph thread, schedule a subsequent
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// event to change the type of oscillator1.
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SimpleTest.executeSoon(function() {
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oscillator1.type = "triangle";
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// Another triangle wave with -1 gain should cancel the first. This is
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// starting at the same time as the type change, assuming that the phase
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// is reset on type change. A negative frequency should achieve the same
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// as the -1 gain but for bug 916285.
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var oscillator2 = ctx.createOscillator();
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oscillator2.type = "triangle";
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oscillator2.start(0);
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var processor = ctx.createScriptProcessor(bufferSize, 1, 0);
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oscillator1.connect(processor);
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var gain = ctx.createGain();
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gain.gain.value = -1;
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gain.connect(processor);
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oscillator2.connect(gain);
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processor.onaudioprocess = function(e) {
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compareChannels(e.inputBuffer.getChannelData(0),
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new Float32Array(bufferSize));
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e.target.onaudioprocess = null;
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SimpleTest.finish();
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}
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});
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};
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startTest();
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</script>
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</pre>
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</body>
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</html>
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