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<!DOCTYPE html>
<html>
<head>
<title>
Test AudioParam.linearRampToValueAtTime
</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="/webaudio/resources/audioparam-testing.js"></script>
</head>
<body>
<script id="layout-test-code">
let audit = Audit.createTaskRunner();
// Play a long DC signal out through an AudioGainNode, and call
// setValueAtTime() and linearRampToValueAtTime() at regular intervals to
// set the starting and ending values for a linear ramp. Each time
// interval has a ramp with a different starting and ending value so that
// there is a discontinuity at each time interval boundary. The
// discontinuity is for testing timing. Also, we alternate between an
// increasing and decreasing ramp for each interval.
// Number of tests to run.
let numberOfTests = 100;
// Max allowed difference between the rendered data and the expected
// result.
let maxAllowedError = 1.865e-6;
// Set the gain node value to the specified value at the specified time.
function setValue(value, time) {
gainNode.gain.setValueAtTime(value, time);
}
// Generate a linear ramp ending at time |endTime| with an ending value of
// |value|.
function generateRamp(value, startTime, endTime){
// |startTime| is ignored because the linear ramp uses the value from
// the
// setValueAtTime() call above.
gainNode.gain.linearRampToValueAtTime(value, endTime)}
audit.define(
{
label: 'test',
description: 'AudioParam linearRampToValueAtTime() functionality'
},
function(task, should) {
createAudioGraphAndTest(
task, should, numberOfTests, 1, setValue, generateRamp,
'linearRampToValueAtTime()', maxAllowedError,
createLinearRampArray);
});
audit.run();
</script>
</body>
</html>
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