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<head>
<title>
OfflineAudioContext.startRendering Promise with oncomplete
</title>
<script src="../../imported/w3c/web-platform-tests/resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="../resources/audit-util.js"></script>
<script src="../resources/audit.js"></script>
</head>
<body>
<script id="layout-test-code">
let audit = Audit.createTaskRunner();
let context;
let promise;
let renderedData;
let promiseData;
let sampleRate = 48000;
let renderSeconds = 1;
let renderFrames = sampleRate * renderSeconds;
let contextChannels = 2;
function compareData(should) {
// The spec implies that the same buffer is returned by both oncomplete
// and the promise. Check that they are identical.
should(
renderedData === promiseData,
'AudioBuffer returned by oncomplete and promise are identical')
.beTrue();
}
function checkResult(task, should, event) {
renderedData = event.renderedBuffer;
promise.then(function(result) {
promiseData = result;
compareData(should);
task.done();
});
}
// Create an offline context and verify that both the oncomplete and
// promise are returned with the same stuff.
audit.define(
{
label: 'test',
description:
'OfflineAudioContext.startRendering Promise with oncomplete'
},
(task, should) => {
context = new OfflineAudioContext(
contextChannels, renderFrames, sampleRate);
let buffer =
context.createBuffer(contextChannels, renderFrames, sampleRate);
for (let k = 0; k < renderFrames; ++k) {
buffer.getChannelData(0)[k] = 1;
buffer.getChannelData(1)[k] = 2;
}
let source = context.createBufferSource();
source.buffer = buffer;
source.connect(context.destination);
source.start();
context.oncomplete = (event) => {
checkResult(task, should, event);
};
promise = context.startRendering();
});
audit.run();
</script>
</body>
</html>