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72 lines
2.0 KiB
HTML
72 lines
2.0 KiB
HTML
<!DOCTYPE HTML>
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<html>
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<head>
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<title>Test increasing delay of DelayNode after input finishes</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 signalLength = 100;
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const bufferSize = 1024;
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// Delay should be long enough to allow CC to run
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const delayBufferCount = 50;
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const delayLength = delayBufferCount * bufferSize + 700;
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var count = 0;
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function applySignal(buffer, offset) {
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for (var i = 0; i < signalLength; ++i) {
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buffer.getChannelData(0)[offset + i] = Math.cos(Math.PI * i / signalLength);
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}
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}
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function onAudioProcess(e) {
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switch(count) {
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case 5:
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SpecialPowers.forceGC();
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SpecialPowers.forceCC();
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break;
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case delayBufferCount:
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var offset = delayLength - count * bufferSize;
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var ctx = e.target.context;
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var expected = ctx.createBuffer(1, bufferSize, ctx.sampleRate);
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applySignal(expected, offset);
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compareBuffers(e.inputBuffer, expected);
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SimpleTest.finish();
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}
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count++;
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}
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function startTest() {
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var ctx = new AudioContext();
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var processor = ctx.createScriptProcessor(bufferSize, 1, 0);
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processor.onaudioprocess = onAudioProcess;
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// Switch on delay at a time in the future.
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var delayDuration = delayLength / ctx.sampleRate;
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var delayStartTime = (delayLength - bufferSize) / ctx.sampleRate;
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var delay = ctx.createDelay(delayDuration);
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delay.delayTime.setValueAtTime(delayDuration, delayStartTime);
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delay.connect(processor);
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// Short signal that finishes before switching to long delay
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var buffer = ctx.createBuffer(1, signalLength, ctx.sampleRate);
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applySignal(buffer, 0);
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var source = ctx.createBufferSource();
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source.buffer = buffer;
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source.start();
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source.connect(delay);
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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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