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<!doctype html>
<html>
<head>
<title>MediaRecorder Blob event timecode</title>
<link rel="help" href="https://w3c.github.io/mediacapture-record/MediaRecorder.html#dom-mediarecorder-start">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="../mediacapture-streams/permission-helper.js"></script>
</head>
<body>
<script>
promise_test(async t => {
await setMediaPermission();
const stream = await navigator.mediaDevices.getUserMedia({video:true, audio:true});
t.add_cleanup(() => stream.getTracks().forEach(tr => tr.stop()));
const recorder = new MediaRecorder(stream);
// Sets 0 timeslice will call the first chunk to be triggered immediately.
recorder.start(0);
let combinedSize = 0;
let previous_timecode = 0;
while (combinedSize < 2000) {
const {data, timecode} = await new Promise(r => recorder.ondataavailable = r);
if (combinedSize === 0) {
assert_equals(timecode, 0, "first chunk timecode must be 0");
} else {
assert_greater_than(timecode, previous_timecode, "timecode must increase monotonically");
}
previous_timecode = timecode;
combinedSize += data.size;
}
recorder.stop();
}, "MediaRecorder Blob timecode for first chunk must be 0 and monotonically increasing");
</script>
</body>
</html>
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