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<!DOCTYPE html>
<html>
<head>
<title>Test setValueAtTime with startTime 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 setValueAtTime with startTime 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;
// Use a ramp of slope 1 per frame to measure time.
// The end value is the extent of exact precision in single
// precision float.
const rampEnd = context.length - suspendFrame;
const rampEndSeconds = context.length / context.sampleRate;
context.suspend(suspendFrame / context.sampleRate)
.then(() => {
// Call setValueAtTime with a time in the past
test.gain.setValueAtTime(0.0, 0.5 * context.currentTime);
test.gain.linearRampToValueAtTime(rampEnd, rampEndSeconds);
reference.gain.setValueAtTime(0.0, context.currentTime);
reference.gain.linearRampToValueAtTime(
rampEnd, rampEndSeconds);
})
.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>
|
