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<!DOCTYPE HTML>
<html>
<head>
<title>Test for Bug 833386 - TextTrackList</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script type="text/javascript" src="manifest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
</head>
<body>
<video id="v">
<script type="text/javascript">
/**
* This test is used to check different things.
* (1) the default value of track element's attributes
* (2) readonly attributes can't be modifted
* (3) the order of tracks in the media element's track list
*/
var enabledTrackElement = null;
async function runTest() {
addFourTextTrackElementsToVideo();
startLoadingVideo();
await waitUntilEnableTrackLoaded();
checkTracksStatus();
SimpleTest.finish();
}
SimpleTest.waitForExplicitFinish();
onload = runTest;
/**
* The following are test helper functions.
*/
function addFourTextTrackElementsToVideo() {
let video = document.getElementById("v");
isnot(video.textTracks, undefined,
"HTMLMediaElement::TextTrack() property should be available.")
let trackList = video.textTracks;
is(trackList.length, 0, "Length should be 0.");
ok(typeof video.addTextTrack == "function",
"HTMLMediaElement::AddTextTrack() function should be available.")
// Insert some tracks in an order that is not sorted, we will test if they
// are sorted later.
info(`- Add a track element with label 'third' -`);
video.addTextTrack("subtitles", "third", "en-CA");
is(trackList.length, 1, "Length should be 1.");
let textTrack = video.textTracks[0];
checkAttributesDefaultValue(textTrack);
checkTextTrackMode(textTrack);
checkReadOnlyAttributes(textTrack);
info(`- Add a track element with label 'first' -`);
let trackOne = document.createElement("track");
video.appendChild(trackOne);
trackOne.label = "first";
trackOne.src = "basic.vtt";
trackOne.default = true;
trackOne.id = "2";
// The automatic track selection would choose the first track element with
// `default` attribute, so this track would be enable later.
enabledTrackElement = trackOne;
info(`- Add a track element with label 'fourth' -`);
video.addTextTrack("subtitles", "fourth", "en-CA");
info(`- Add a track element with label 'second' -`);
let trackTwo = document.createElement("track");
video.appendChild(trackTwo);
trackTwo.label = "second";
trackTwo.src = "basic.vtt";
// Although this track has `default` attribute as well, it won't be enable by
// the automatic track selection because it's not the first default track in
// the media element's track list.
trackTwo.default = true;
}
function checkAttributesDefaultValue(track) {
is(track.label, "third", "Label should be set to third.");
is(track.language, "en-CA", "Language should be en-CA.");
is(track.kind, "subtitles", "Default kind should be subtitles.");
is(track.mode, "hidden", "Default mode should be hidden.");
}
function checkTextTrackMode(track) {
// Mode should not allow a bogus value.
track.mode = 'bogus';
is(track.mode, 'hidden', "Mode should be not allow a bogus value.");
// Should allow all these values for mode.
changeTextTrackMode("showing");
changeTextTrackMode("disabled");
changeTextTrackMode("hidden");
function changeTextTrackMode(mode) {
track.mode = mode;
is(track.mode, mode, `Mode should allow \"${mode}\"`);
}
}
function checkReadOnlyAttributes(track) {
// All below are read-only properties and so should not allow setting.
track.label = "French subtitles";
is(track.label, "third", "Label is read-only so should still be \"label\".");
track.language = "en";
is(track.language, "en-CA", "Language is read-only so should still be \"en-CA\".");
track.kind = "captions";
is(track.kind, "subtitles", "Kind is read-only so should still be \"subtitles\"");
}
function startLoadingVideo() {
let video = document.getElementById("v");
video.src = "seek.webm";
video.preload = "metadata";
}
async function waitUntilEnableTrackLoaded() {
info(`wait until the enabled track finishes loading`);
await once(enabledTrackElement, "load");
is(enabledTrackElement.readyState, 2, "Track::ReadyState should be set to LOADED.");
}
function checkTracksStatus() {
// We're testing two things here,
// (1) the tracks created from a track element have a default mode 'disabled'
// and tracks created from 'addTextTrack' method have a default
// mode of 'hidden'.
// (2) we're testing that the tracks are sorted properly. For the tracks to
// be sorted the first two tracks, added through a TrackElement, must occupy
// the first two indexes in their TrackElement tree order. The second two
// tracks, added through the 'addTextTrack' method, will occupy the last two
// indexes in the order that they were added in.
let trackData = [
{ label: "first", mode: "showing", id: "2" },
{ label: "second", mode: "disabled", id: "" },
{ label: "third", mode: "hidden", id: "" },
{ label: "fourth", mode: "hidden", id: "" }
];
let video = document.getElementById("v");
is(video.textTracks.length, trackData.length,
`TextTracks length should be ${trackData.length}`);
for (let i = 0; i < trackData.length; i++) {
let track = video.textTracks[i];
isnot(track, null, `Video should have a text track at index ${i}`);
let info = trackData[i];
for (let key in info) {
is(track[key], info[key],
`Track at index ${i} should have a '${key}' property with a value of '${info[key]}'.`);
}
}
}
</script>
</body>
</html>
|
