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