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<!doctype html>
<meta charset=utf-8>
<html>
<head>
<title>Test exponentialRampToValue with end 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>
<script src="retrospective-test.js"></script>
</head>
<body>
<script>
let audit = Audit.createTaskRunner();
audit.define(
{
label: 'test',
description: 'Test exponentialRampToValue with end time in the past'
},
(task, should) => {
let {context, source, test, reference} = setupRetrospectiveGraph();
// Suspend the context at this frame so we can synchronously set up
// automations.
const suspendFrame = 128;
context.suspend(suspendFrame / context.sampleRate)
.then(() => {
// Call setTargetAtTime with a time in the past
test.gain.exponentialRampToValueAtTime(
0.1, 0.5 * context.currentTime);
test.gain.exponentialRampToValueAtTime(0.9, 1.0);
reference.gain.exponentialRampToValueAtTime(
0.1, context.currentTime);
reference.gain.exponentialRampToValueAtTime(0.9, 1.0);
})
.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>
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