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<!DOCTYPE html>
<html>
<head>
<title>
audionode-connect-order.html
</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 id="layout-test-code">
let audit = Audit.createTaskRunner();
let sampleRate = 44100.0;
let renderLengthSeconds = 0.125;
let delayTimeSeconds = 0.1;
function createSinWaveBuffer(context, lengthInSeconds, frequency) {
let audioBuffer =
context.createBuffer(1, lengthInSeconds * sampleRate, sampleRate);
let n = audioBuffer.length;
let data = audioBuffer.getChannelData(0);
for (let i = 0; i < n; ++i) {
data[i] = Math.sin(frequency * 2 * Math.PI * i / sampleRate);
}
return audioBuffer;
}
audit.define(
{
label: 'Test connections',
description:
'AudioNode connection order doesn\'t trigger assertion errors'
},
function(task, should) {
// Create offline audio context.
let context = new OfflineAudioContext(
1, sampleRate * renderLengthSeconds, sampleRate);
let toneBuffer =
createSinWaveBuffer(context, renderLengthSeconds, 880);
let bufferSource = context.createBufferSource();
bufferSource.buffer = toneBuffer;
bufferSource.connect(context.destination);
let delay = context.createDelay();
delay.delayTime.value = delayTimeSeconds;
// We connect delay node to gain node before anything is connected
// to delay node itself. We do this because we try to trigger the
// ASSERT which might be fired due to AudioNode connection order,
// especially when gain node and delay node is involved e.g.
// https://bugs.webkit.org/show_bug.cgi?id=76685.
should(() => {
let gain = context.createGain();
gain.connect(context.destination);
delay.connect(gain);
}, 'Connecting nodes').notThrow();
bufferSource.start(0);
let promise = context.startRendering();
should(promise, 'OfflineContext startRendering()')
.beResolved()
.then(task.done.bind(task));
});
audit.run();
</script>
</body>
</html>
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