78 lines
2.8 KiB
HTML
78 lines
2.8 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<title>
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Test DelayNode when maxDelayTime requires rounding
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</title>
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="/webaudio/resources/audit-util.js"></script>
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<script src="/webaudio/resources/audit.js"></script>
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</head>
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<body>
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<script id="layout-test-code">
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let sampleRate = 44100;
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let inputLengthSeconds = 1;
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let renderLengthSeconds = 2;
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// Delay for one second plus 0.4 of a sample frame, to test that
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// DelayNode is properly rounding up when calculating its buffer
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// size (crbug.com/1065110).
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let delayTimeSeconds = 1 + 0.4 / sampleRate;
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let audit = Audit.createTaskRunner();
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audit.define(
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{
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label: 'maxdelay-rounding',
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description: 'Test DelayNode when maxDelayTime requires rounding',
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},
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(task, should) => {
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let context = new OfflineAudioContext({
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numberOfChannels: 1,
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length: sampleRate * renderLengthSeconds,
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sampleRate: sampleRate,
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});
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// Create a constant source to use as input.
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let src = new ConstantSourceNode(context);
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// Create a DelayNode to delay for delayTimeSeconds.
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let delay = new DelayNode(context, {
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maxDelayTime: delayTimeSeconds,
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delayTime: delayTimeSeconds,
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});
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src.connect(delay).connect(context.destination);
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src.start();
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context.startRendering()
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.then(renderedBuffer => {
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let renderedData = renderedBuffer.getChannelData(0);
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// The first delayTimeSeconds of output should be silent.
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let expectedSilentFrames = Math.floor(
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delayTimeSeconds * sampleRate);
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should(
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renderedData.slice(0, expectedSilentFrames),
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`output[0:${expectedSilentFrames - 1}]`)
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.beConstantValueOf(0);
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// The rest should be non-silent: that is, there should
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// be at least one non-zero sample. (Any reasonable
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// interpolation algorithm will make all these samples
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// non-zero, but I don't think that's guaranteed by the
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// spec, so we use a conservative test for now.)
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should(
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renderedData.slice(expectedSilentFrames),
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`output[${expectedSilentFrames}:]`)
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.notBeConstantValueOf(0);
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})
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.then(() => task.done());
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});
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audit.run();
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</script>
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</body>
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</html>
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