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80 lines
2.9 KiB
HTML
80 lines
2.9 KiB
HTML
<!doctype html>
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<meta charset=utf-8>
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<html>
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<head>
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<title>Test setTargetAtTime with start time in the past</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>
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let audit = Audit.createTaskRunner();
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audit.define(
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{
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label: 'test',
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description: 'Test setTargetAtTime with start time in the past'
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},
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(task, should) => {
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// Use a sample rate that is a power of two to eliminate round-off
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// in computing the currentTime.
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let context = new OfflineAudioContext(2, 16384, 16384);
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let source = new ConstantSourceNode(context);
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// Suspend the context at this frame so we can synchronously set up
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// automations.
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const suspendFrame = 128;
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let test = new GainNode(context);
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let reference = new GainNode(context);
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source.connect(test);
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source.connect(reference);
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let merger = new ChannelMergerNode(
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context, {numberOfInputs: context.destination.channelCount});
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test.connect(merger, 0, 0);
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reference.connect(merger, 0, 1);
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merger.connect(context.destination);
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context.suspend(suspendFrame / context.sampleRate)
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.then(() => {
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// Call setTargetAtTime with a time in the past
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test.gain.setTargetAtTime(0.1, 0.5*context.currentTime, 0.1);
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reference.gain.setTargetAtTime(0.1, context.currentTime, 0.1);
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})
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.then(() => context.resume());
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source.start();
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context.startRendering()
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.then(resultBuffer => {
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let testValue = resultBuffer.getChannelData(0);
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let referenceValue = resultBuffer.getChannelData(1);
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// Until the suspendFrame, both should be exactly equal to 1.
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should(
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testValue.slice(0, suspendFrame),
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`Test[0:${suspendFrame - 1}]`)
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.beConstantValueOf(1);
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should(
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referenceValue.slice(0, suspendFrame),
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`Reference[0:${suspendFrame - 1}]`)
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.beConstantValueOf(1);
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// After the suspendFrame, both should be equal (and not
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// constant)
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should(
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testValue.slice(suspendFrame), `Test[${suspendFrame}:]`)
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.beEqualToArray(referenceValue.slice(suspendFrame));
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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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