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<!DOCTYPE HTML>
<html>
<head>
<title>WebVTT : changing track's mode during loading</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script src="manifest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
</head>
<body>
<script class="testbody" type="text/javascript">
/**
* This test is to ensure that we won't get `error` event when we change track's
* mode during loading. In this test, track element starts loading after setting
* the src and we would start another load later just after the channel which is
* used to fetch data starts. The second load is triggered by mode changes, and
* it should stop the prevous load and won't generate any error.
*/
async function startTest() {
const video = createVideo();
const trackElement = createAndAppendtrackElemententToVideo(video);
await changeTrackModeDuringLoading(trackElement);
await waitUntilTrackLoaded(trackElement);
removeNodeAndSource(video);
SimpleTest.finish();
}
SimpleTest.waitForExplicitFinish();
SpecialPowers.pushPrefEnv({"set": [["media.webvtt.testing.events", true]]},
startTest);
/**
* The following are test helper functions.
*/
function createVideo() {
info(`create video`);
let video = document.createElement("video");
video.src = "gizmo.mp4";
document.body.appendChild(video);
return video;
}
function createAndAppendtrackElemententToVideo(video) {
let trackElement = document.createElement("track");
trackElement.default = true;
video.append(trackElement);
return trackElement;
}
async function changeTrackModeDuringLoading(trackElement) {
info(`set src to start loading`);
trackElement.src = "basic.vtt";
info(`wait until starting loading resource.`);
await once(trackElement, "mozStartedLoadingTextTrack");
info(`changeing track's mode during loading should not cause loading failed.`);
trackElement.onerror = () => {
ok(false, `Should not get error event!`);
}
trackElement.track.mode = "hidden";
}
async function waitUntilTrackLoaded(trackElement) {
if (trackElement.readyState != 2) {
info(`wait until the track finishes loading`);
await once(trackElement, "load");
}
is(trackElement.readyState, 2, "Track::ReadyState should be set to LOADED.");
is(trackElement.track.cues.length, 6, "Cue list length should be 6.");
}
</script>
</body>
</html>
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