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<!DOCTYPE HTML>
<html>
<head>
<title>WebVTT : cue display should be updated immediately after adding or removing cue</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 used to ensure that we will update cue display immediately after
* adding or removing cue after video starts, because `show-poster` flag would be
* reset after video starts, which allows us to process cues instead of showing
* a poster. In this test, we start with adding a cue [0:5] to video, which
* should be showed in the beginning, and then remove the cue later. The cue
* should be removed immediately, not show
*/
async function startTest() {
const video = await createVideo();
await startVideo(video);
info(`cue should be showed immediately after it was added.`);
const cue = createCueAndAddCueToVideo(video);
await waitUntilCueShows(cue);
info(`cue should be hid immediately after it was removed.`);
removeCueFromVideo(cue, video);
checkIfCueHides(cue, video);
endTestAndClearVideo(video);
}
SimpleTest.waitForExplicitFinish();
onload = startTest;
/**
* The following are test helper functions.
*/
async function createVideo() {
let video = document.createElement("video");
video.src = "gizmo.mp4";
video.controls = true;
document.body.appendChild(video);
// wait until media has loaded any data, because we won't update cue if it has
// not got any data.
await once(video, "loadedmetadata");
return video;
}
async function startVideo(video) {
info(`start play video`);
const played = video && await video.play().then(() => true, () => false);
ok(played, "video has started playing");
}
function createCueAndAddCueToVideo(video) {
let track = video.addTextTrack("subtitles");
track.mode = "showing";
let cue = new VTTCue(0, 5, "Test");
track.addCue(cue);
return cue;
}
function removeCueFromVideo(cue, video) {
let track = video.textTracks[0];
track.removeCue(cue);
}
async function waitUntilCueShows(cue) {
info(`wait until cue shows`);
// cue has not been showed yet.
cue = SpecialPowers.wrap(cue);
if (!cue.getActive) {
await once(cue, "enter");
}
ok(cue.getActive, `cue has been showed,`);
}
function checkIfCueHides(cue, video) {
ok(!SpecialPowers.wrap(cue).getActive, `cue has been hidden.`);
ok(video.currentTime < cue.endTime,
`cue is removed at ${video.currentTime}s before reaching its endtime.`);
}
function endTestAndClearVideo(video) {
removeNodeAndSource(video);
SimpleTest.finish();
}
</script>
</body>
</html>
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