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const video = document.getElementById('js-video-player');
function changeQuality(selection) {
var currentVideoTime = video.currentTime;
var videoPaused = video.paused;
var videoSpeed = video.playbackRate;
var videoSource;
if (avMerge)
avMerge.close();
if (selection.type == 'uni'){
videoSource = data['uni_sources'][selection.index];
video.src = videoSource.url;
} else {
let srcPair = data['pair_sources'][selection.index];
videoSource = srcPair[0];
avMerge = new AVMerge(video, srcPair, currentVideoTime);
}
video.currentTime = currentVideoTime;
if (!videoPaused){
video.play();
}
video.playbackRate = videoSpeed;
}
// Initialize av-merge
var avMerge;
if (data.using_pair_sources) {
var srcPair = data['pair_sources'][data['pair_idx']];
var videoSource = srcPair[0];
// Do it dynamically rather than as the default in jinja
// in case javascript is disabled
avMerge = new AVMerge(video, srcPair, 0);
}
// Quality selector
document.getElementById('quality-select').addEventListener(
'change', function(e) {
changeQuality(JSON.parse(this.value))
}
);
// Set up video start time from &t parameter
if (data.time_start != 0 && video) {video.currentTime = data.time_start};
// External video speed control
var speedInput = document.getElementById('speed-control');
speedInput.addEventListener('keyup', (event) => {
if (event.key === 'Enter') {
var speed = parseFloat(speedInput.value);
if(!isNaN(speed)){
video.playbackRate = speed;
}
}
});
// Playlist lazy image loading
if (data.playlist && data.playlist['id'] !== null) {
// lazy load playlist images
// copied almost verbatim from
// https://css-tricks.com/tips-for-rolling-your-own-lazy-loading/
// IntersectionObserver isn't supported in pre-quantum
// firefox versions, but the alternative of making it
// manually is a performance drain, so oh well
var observer = new IntersectionObserver(lazyLoad, {
// where in relation to the edge of the viewport, we are observing
rootMargin: "100px",
// how much of the element needs to have intersected
// in order to fire our loading function
threshold: 1.0
});
function lazyLoad(elements) {
elements.forEach(item => {
if (item.intersectionRatio > 0) {
// set the src attribute to trigger a load
item.target.src = item.target.dataset.src;
// stop observing this element. Our work here is done!
observer.unobserve(item.target);
};
});
};
// Tell our observer to observe all img elements with a "lazy" class
var lazyImages = document.querySelectorAll('img.lazy');
lazyImages.forEach(img => {
observer.observe(img);
});
}
// Autoplay
if (data.settings.related_videos_mode !== 0 || data.playlist !== null) {
let playability_error = !!data.playability_error;
let isPlaylist = false;
if (data.playlist !== null && data.playlist['current_index'] !== null)
isPlaylist = true;
// read cookies on whether to autoplay
// https://developer.mozilla.org/en-US/docs/Web/API/Document/cookie
let cookieValue;
let playlist_id;
if (isPlaylist) {
// from https://stackoverflow.com/a/6969486
function escapeRegExp(string) {
// $& means the whole matched string
return string.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
}
playlist_id = data.playlist['id'];
playlist_id = escapeRegExp(playlist_id);
cookieValue = document.cookie.replace(new RegExp(
'(?:(?:^|.*;\\s*)autoplay_'
+ playlist_id + '\\s*\\=\\s*([^;]*).*$)|^.*$'
), '$1');
} else {
cookieValue = document.cookie.replace(new RegExp(
'(?:(?:^|.*;\\s*)autoplay\\s*\\=\\s*([^;]*).*$)|^.*$'
),'$1');
}
let autoplayEnabled = 0;
if(cookieValue.length === 0){
autoplayEnabled = 0;
} else {
autoplayEnabled = Number(cookieValue);
}
// check the checkbox if autoplay is on
let checkbox = document.querySelector('.autoplay-toggle');
if(autoplayEnabled){
checkbox.checked = true;
}
// listen for checkbox to turn autoplay on and off
let cookie = 'autoplay'
if (isPlaylist)
cookie += '_' + playlist_id;
checkbox.addEventListener( 'change', function() {
if(this.checked) {
autoplayEnabled = 1;
document.cookie = cookie + '=1; SameSite=Strict';
} else {
autoplayEnabled = 0;
document.cookie = cookie + '=0; SameSite=Strict';
}
});
if(!playability_error){
// play the video if autoplay is on
if(autoplayEnabled){
video.play();
}
}
// determine next video url
let nextVideoUrl;
if (isPlaylist) {
let currentIndex = data.playlist['current_index'];
if (data.playlist['current_index']+1 == data.playlist['items'].length)
nextVideoUrl = null;
else
nextVideoUrl = data.playlist['items'][data.playlist['current_index']+1]['url'];
// scroll playlist to proper position
// item height + gap == 100
let pl = document.querySelector('.playlist-videos');
pl.scrollTop = 100*currentIndex;
} else {
if (data.related.length === 0)
nextVideoUrl = null;
else
nextVideoUrl = data.related[0]['url'];
}
let nextVideoDelay = 1000;
// go to next video when video ends
// https://stackoverflow.com/a/2880950
if (nextVideoUrl) {
if(playability_error){
videoEnded();
} else {
video.addEventListener('ended', videoEnded, false);
}
function nextVideo(){
if(autoplayEnabled){
window.location.href = nextVideoUrl;
}
}
function videoEnded(e) {
window.setTimeout(nextVideo, nextVideoDelay);
}
}
}
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