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Q = document.querySelector.bind(document);
QA = document.querySelectorAll.bind(document);
function text(msg) { return document.createTextNode(msg); }
function clearNode(node) { while (node.firstChild) node.removeChild(node.firstChild); }
function toTimestamp(seconds) {
var seconds = Math.floor(seconds);
var minutes = Math.floor(seconds/60);
var seconds = seconds % 60;
var hours = Math.floor(minutes/60);
var minutes = minutes % 60;
if (hours) {
return `0${hours}:`.slice(-3) + `0${minutes}:`.slice(-3) + `0${seconds}`.slice(-2);
}
return `0${minutes}:`.slice(-3) + `0${seconds}`.slice(-2);
}
var cur_track_idx = 0;
function getActiveTranscriptTrackIdx() {
let textTracks = Q("video").textTracks;
if (!textTracks.length) return;
for (let i=0; i < textTracks.length; i++) {
if (textTracks[i].mode == "showing") {
cur_track_idx = i;
return cur_track_idx;
}
}
return cur_track_idx;
}
function getActiveTranscriptTrack() { return Q("video").textTracks[getActiveTranscriptTrackIdx()]; }
function getDefaultTranscriptTrackIdx() {
let textTracks = Q("video").textTracks;
return textTracks.length - 1;
}
function doXhr(url, callback=null) {
var xhr = new XMLHttpRequest();
xhr.open("GET", url);
xhr.onload = (e) => {
let ok = xhr.status >= 200 && xhr.status < 300;
if (ok) callback(e.currentTarget.response);
else alert(`${xhr.responseURL} status code: ${xhr.status}`);
}
xhr.send();
return xhr;
}
window.addEventListener('DOMContentLoaded', function() {
cur_track_idx = getDefaultTranscriptTrackIdx();
});
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