pandora/static/mobile/js/VideoElement.js

730 lines
24 KiB
JavaScript

'use strict';
/*@
VideoElement <f> VideoElement Object
options <o> Options object
autoplay <b|false> autoplay
items <a|[]> array of objects with src,in,out,duration
loop <b|false> loop playback
playbackRate <n|1> playback rate
position <n|0> start position
self <o> Shared private variable
([options[, self]]) -> <o:Element> VideoElement Object
loadedmetadata <!> loadedmetadata
itemchange <!> itemchange
seeked <!> seeked
seeking <!> seeking
sizechange <!> sizechange
ended <!> ended
@*/
(function() {
var queue = [],
queueSize = 100,
restrictedElements = [],
requiresUserGesture = mediaPlaybackRequiresUserGesture(),
unblock = [];
window.VideoElement = function(options) {
var self = {},
that = document.createElement("div");
self.options = {
autoplay: false,
items: [],
loop: false,
muted: false,
playbackRate: 1,
position: 0,
volume: 1
}
Object.assign(self.options, options);
debug(self.options)
that.style.position = "relative"
that.style.width = "100%"
that.style.height = "100%"
that.style.maxHeight = "100vh"
that.style.margin = 'auto'
if (self.options.aspectratio) {
that.style.aspectRatio = self.options.aspectratio
} else {
that.style.height = '128px'
}
that.triggerEvent = function(event, data) {
if (event != 'timeupdate') {
debug('Video', 'triggerEvent', event, data);
}
event = new Event(event)
event.data = data
that.dispatchEvent(event)
}
/*
.update({
items: function() {
self.loadedMetadata = false;
loadItems(function() {
self.loadedMetadata = true;
var update = true;
if (self.currentItem >= self.numberOfItems) {
self.currentItem = 0;
}
if (!self.numberOfItems) {
self.video.src = '';
that.triggerEvent('durationchange', {
duration: that.duration()
});
} else {
if (self.currentItemId != self.items[self.currentItem].id) {
// check if current item is in new items
self.items.some(function(item, i) {
if (item.id == self.currentItemId) {
self.currentItem = i;
loadNextVideo();
update = false;
return true;
}
});
if (update) {
self.currentItem = 0;
self.currentItemId = self.items[self.currentItem].id;
}
}
if (!update) {
that.triggerEvent('seeked');
that.triggerEvent('durationchange', {
duration: that.duration()
});
} else {
setCurrentVideo(function() {
that.triggerEvent('seeked');
that.triggerEvent('durationchange', {
duration: that.duration()
});
});
}
}
});
},
playbackRate: function() {
self.video.playbackRate = self.options.playbackRate;
}
})
.css({width: '100%', height: '100%'});
*/
debug('Video', 'VIDEO ELEMENT OPTIONS', self.options);
self.currentItem = -1;
self.currentTime = 0;
self.currentVideo = 0;
self.items = [];
self.loadedMetadata = false;
that.paused = self.paused = true;
self.seeking = false;
self.loading = true;
self.buffering = true;
self.videos = [getVideo(), getVideo()];
self.video = self.videos[self.currentVideo];
self.video.classList.add("active")
self.volume = self.options.volume;
self.muted = self.options.muted;
self.brightness = document.createElement('div')
self.brightness.style.top = '0'
self.brightness.style.left = '0'
self.brightness.style.width = '100%'
self.brightness.style.height = '100%'
self.brightness.style.background = 'rgb(0, 0, 0)'
self.brightness.style.opacity = '0'
self.brightness.style.position = "absolute"
that.append(self.brightness)
self.timeupdate = setInterval(function() {
if (!self.paused
&& !self.loading
&& self.loadedMetadata
&& self.items[self.currentItem]
&& self.items[self.currentItem].out
&& self.video.currentTime >= self.items[self.currentItem].out) {
setCurrentItem(self.currentItem + 1);
}
}, 30);
// mobile browsers only allow playing media elements after user interaction
if (restrictedElements.length > 0) {
unblock.push(setSource)
setTimeout(function() {
that.triggerEvent('requiresusergesture');
})
} else {
setSource();
}
function getCurrentTime() {
var item = self.items[self.currentItem];
return self.seeking || self.loading
? self.currentTime
: item ? item.position + self.video.currentTime - item['in'] : 0;
}
function getset(key, value) {
var ret;
if (isUndefined(value)) {
ret = self.video[key];
} else {
self.video[key] = value;
ret = that;
}
return ret;
}
function getVideo() {
var video = getVideoElement()
video.style.display = "none"
video.style.width = "100%"
video.style.height = "100%"
video.style.margin = "auto"
video.style.background = '#000'
if (self.options.aspectratio) {
video.style.aspectRatio = self.options.aspectratio
} else {
video.style.height = '128px'
}
video.style.top = 0
video.style.left = 0
video.style.position = "absolute"
video.preload = "metadata"
video.addEventListener("ended", event => {
if (self.video == video) {
setCurrentItem(self.currentItem + 1);
}
})
video.addEventListener("loadedmetadata", event => {
//console.log("!!", video.src, "loaded", 'current?', video == self.video)
})
video.addEventListener("progress", event => {
// stop buffering if buffered to end point
var item = self.items[self.currentItem],
nextItem = mod(self.currentItem + 1, self.numberOfItems),
next = self.items[nextItem],
nextVideo = self.videos[mod(self.currentVideo + 1, self.videos.length)];
if (self.video == video && (video.preload != 'none' || self.buffering)) {
if (clipCached(video, item)) {
video.preload = 'none';
self.buffering = false;
if (nextItem != self.currentItem) {
nextVideo.preload = 'auto';
}
} else {
if (nextItem != self.currentItem && nextVideo.preload != 'none' && nextVideo.src) {
nextVideo.preload = 'none';
}
}
} else if (nextVideo == video && video.preload != 'none' && nextVideo.src) {
if (clipCached(video, next)) {
video.preload = 'none';
}
}
function clipCached(video, item) {
var cached = false
for (var i=0; i<video.buffered.length; i++) {
if (video.buffered.start(i) <= item['in']
&& video.buffered.end(i) >= item.out) {
cached = true
}
}
return cached
}
})
video.addEventListener("volumechange", event => {
if (self.video == video) {
that.triggerEvent('volumechange')
}
})
video.addEventListener("play", event => {
/*
if (self.video == video) {
that.triggerEvent('play')
}
*/
})
video.addEventListener("pause", event => {
/*
if (self.video == video) {
that.triggerEvent('pause')
}
*/
})
video.addEventListener("timeupdate", event => {
if (self.video == video) {
/*
var box = self.video.getBoundingClientRect()
if (box.width && box.height) {
that.style.width = box.width + 'px'
that.style.height = box.height + 'px'
}
*/
that.triggerEvent('timeupdate', {
currentTime: getCurrentTime()
})
}
})
video.addEventListener("seeking", event => {
if (self.video == video) {
that.triggerEvent('seeking')
}
})
video.addEventListener("stop", event => {
if (self.video == video) {
//self.video.pause();
that.triggerEvent('ended');
}
})
that.append(video)
return video
}
function getVideoElement() {
var video;
if (requiresUserGesture) {
if (queue.length) {
video = queue.pop();
} else {
video = document.createElement('video');
restrictedElements.push(video);
}
} else {
video = document.createElement('video');
}
video.playsinline = true
video.setAttribute('playsinline', 'playsinline')
video.setAttribute('webkit-playsinline', 'webkit-playsinline')
video.WebKitPlaysInline = true
return video
};
function getVolume() {
var volume = 1;
if (self.items[self.currentItem] && isNumber(self.items[self.currentItem].volume)) {
volume = self.items[self.currentItem].volume;
}
return self.volume * volume;
}
function isReady(video, callback) {
if (video.seeking && !self.paused && !self.seeking) {
that.triggerEvent('seeking');
debug('Video', 'isReady', 'seeking');
video.addEventListener('seeked', function(event) {
debug('Video', 'isReady', 'seeked');
that.triggerEvent('seeked');
callback(video);
}, {once: true})
} else if (video.readyState) {
callback(video);
} else {
that.triggerEvent('seeking');
video.addEventListener('loadedmetadata', function(event) {
callback(video);
}, {once: true});
video.addEventListener('seeked', event => {
that.triggerEvent('seeked');
}, {once: true})
}
}
function loadItems(callback) {
debug('loadItems')
var currentTime = 0,
items = self.options.items.map(function(item) {
return isObject(item) ? {...item} : {src: item};
});
self.items = items;
self.numberOfItems = self.items.length;
items.forEach(item => {
item['in'] = item['in'] || 0;
item.position = currentTime;
if (item.out) {
item.duration = item.out - item['in'];
}
if (item.duration) {
if (!item.out) {
item.out = item.duration;
}
currentTime += item.duration;
item.id = getId(item);
} else {
getVideoInfo(item.src, function(info) {
item.duration = info.duration;
if (!item.out) {
item.out = item.duration;
}
currentTime += item.duration;
item.id = getId(item);
});
}
})
debug('loadItems done')
callback && callback();
function getId(item) {
return item.id || item.src + '/' + item['in'] + '-' + item.out;
}
}
function loadNextVideo() {
if (self.numberOfItems <= 1) {
return;
}
var item = self.items[self.currentItem],
nextItem = mod(self.currentItem + 1, self.numberOfItems),
next = self.items[nextItem],
nextVideo = self.videos[mod(self.currentVideo + 1, self.videos.length)];
nextVideo.addEventListener('loadedmetadata', function() {
if (self.video != nextVideo) {
nextVideo.currentTime = next['in'] || 0;
}
}, {once: true});
nextVideo.src = next.src;
nextVideo.preload = 'metadata';
}
function setCurrentItem(item) {
debug('Video', 'sCI', item, self.numberOfItems);
var interval;
if (item >= self.numberOfItems || item < 0) {
if (self.options.loop) {
item = mod(item, self.numberOfItems);
} else {
self.seeking = false;
self.ended = true;
that.paused = self.paused = true;
self.video && self.video.pause();
that.triggerEvent('ended');
return;
}
}
self.video && self.video.pause();
self.currentItem = item;
self.currentItemId = self.items[self.currentItem].id;
setCurrentVideo(function() {
if (!self.loadedMetadata) {
self.loadedMetadata = true;
that.triggerEvent('loadedmetadata');
}
debug('Video', 'sCI', 'trigger itemchange',
self.items[self.currentItem]['in'], self.video.currentTime, self.video.seeking);
that.triggerEvent('sizechange');
that.triggerEvent('itemchange', {
item: self.currentItem
});
});
}
function setCurrentVideo(callback) {
var css = {},
muted = self.muted,
item = self.items[self.currentItem],
next;
debug('Video', 'sCV', JSON.stringify(item));
['left', 'top', 'width', 'height'].forEach(function(key) {
css[key] = self.videos[self.currentVideo].style[key];
});
self.currentTime = item.position;
self.loading = true;
if (self.video) {
self.videos[self.currentVideo].style.display = "none"
self.videos[self.currentVideo].classList.remove("active")
self.video.pause();
}
self.currentVideo = mod(self.currentVideo + 1, self.videos.length);
self.video = self.videos[self.currentVideo];
self.video.classList.add("active")
self.video.muted = true; // avoid sound glitch during load
if (!self.video.attributes.src || self.video.attributes.src.value != item.src) {
self.loadedMetadata && debug('Video', 'caching next item failed, reset src');
self.video.src = item.src;
}
self.video.preload = 'metadata';
self.video.volume = getVolume();
self.video.playbackRate = self.options.playbackRate;
Object.keys(css).forEach(key => {
self.video.style[key] = css[key]
})
self.buffering = true;
debug('Video', 'sCV', self.video.src, item['in'],
self.video.currentTime, self.video.seeking);
isReady(self.video, function(video) {
var in_ = item['in'] || 0;
function ready() {
debug('Video', 'sCV', 'ready');
self.seeking = false;
self.loading = false;
self.video.muted = muted;
!self.paused && self.video.play();
self.video.style.display = 'block'
callback && callback();
loadNextVideo();
}
if (video.currentTime == in_) {
debug('Video', 'sCV', 'already at position', item.id, in_, video.currentTime);
ready();
} else {
self.video.addEventListener("seeked", event => {
debug('Video', 'sCV', 'seeked callback');
ready();
}, {once: true})
if (!self.seeking) {
debug('Video', 'sCV set in', video.src, in_, video.currentTime, video.seeking);
self.seeking = true;
video.currentTime = in_;
if (self.paused) {
var promise = self.video.play();
if (promise !== undefined) {
promise.then(function() {
self.video.pause();
self.video.muted = muted;
}).catch(function() {
self.video.pause();
self.video.muted = muted;
});
} else {
self.video.pause();
self.video.muted = muted;
}
}
}
}
});
}
function setCurrentItemTime(currentTime) {
debug('Video', 'sCIT', currentTime, self.video.currentTime,
'delta', currentTime - self.video.currentTime);
isReady(self.video, function(video) {
if (self.video == video) {
if(self.video.seeking) {
self.video.addEventListener("seeked", event => {
that.triggerEvent('seeked');
self.seeking = false;
}, {once: true})
} else if (self.seeking) {
that.triggerEvent('seeked');
self.seeking = false;
}
video.currentTime = currentTime;
}
});
}
function setCurrentTime(time) {
debug('Video', 'sCT', time);
var currentTime, currentItem;
self.items.forEach(function(item, i) {
if (time >= item.position
&& time < item.position + item.duration) {
currentItem = i;
currentTime = time - item.position + item['in'];
return false;
}
});
if (self.items.length) {
// Set to end of items if time > duration
if (isUndefined(currentItem) && isUndefined(currentTime)) {
currentItem = self.items.length - 1;
currentTime = self.items[currentItem].duration + self.items[currentItem]['in'];
}
debug('Video', 'sCT', time, '=>', currentItem, currentTime);
if (currentItem != self.currentItem) {
setCurrentItem(currentItem);
}
self.seeking = true;
self.currentTime = time;
that.triggerEvent('seeking');
setCurrentItemTime(currentTime);
} else {
self.currentTime = 0;
}
}
function setSource() {
self.loadedMetadata = false;
loadItems(function() {
setCurrentTime(self.options.position);
self.options.autoplay && setTimeout(function() {
that.play();
});
});
}
/*@
brightness <f> get/set brightness
@*/
that.brightness = function() {
var ret;
if (arguments.length == 0) {
ret = 1 - parseFloat(self.brightness.style.opacity);
} else {
self.brightness.style.opacity = 1 - arguments[0]
ret = that;
}
return ret;
};
/*@
buffered <f> buffered
@*/
that.buffered = function() {
return self.video.buffered;
};
/*@
currentTime <f> get/set currentTime
@*/
that.currentTime = function() {
var ret;
if (arguments.length == 0) {
ret = getCurrentTime();
} else {
self.ended = false;
setCurrentTime(arguments[0]);
ret = that;
}
return ret;
};
/*@
duration <f> duration
@*/
that.duration = function() {
return self.items ? self.items.reduce((duration, item) => {
return duration + item.duration;
}, 0) : NaN;
};
/*@
muted <f> get/set muted
@*/
that.muted = function(value) {
if (!isUndefined(value)) {
self.muted = value;
}
return getset('muted', value);
};
/*@
pause <f> pause
@*/
that.pause = function() {
that.paused = self.paused = true;
self.video.pause();
that.paused && that.triggerEvent('pause')
};
/*@
play <f> play
@*/
that.play = function() {
if (self.ended) {
that.currentTime(0);
}
isReady(self.video, function(video) {
self.ended = false;
that.paused = self.paused = false;
self.seeking = false;
video.play();
that.triggerEvent('play')
});
};
that.removeElement = function() {
self.currentTime = getCurrentTime();
self.loading = true;
clearInterval(self.timeupdate);
//Chrome does not properly release resources, reset manually
//http://code.google.com/p/chromium/issues/detail?id=31014
self.videos.forEach(function(video) {
video.src = ''
});
return Ox.Element.prototype.removeElement.apply(that, arguments);
};
/*@
videoHeight <f> get videoHeight
@*/
that.videoHeight = function() {
return self.video.videoHeight;
};
/*@
videoWidth <f> get videoWidth
@*/
that.videoWidth = function() {
return self.video.videoWidth;
};
/*@
volume <f> get/set volume
@*/
that.volume = function(value) {
if (isUndefined(value)) {
value = self.volume
} else {
self.volume = value;
self.video.volume = getVolume();
}
return value;
};
return that;
};
// mobile browsers only allow playing media elements after user interaction
function mediaPlaybackRequiresUserGesture() {
// test if play() is ignored when not called from an input event handler
var video = document.createElement('video');
video.muted = true
video.play();
return video.paused;
}
async function removeBehaviorsRestrictions() {
debug('Video', 'remove restrictions on video', self.video, restrictedElements.length, queue.length);
if (restrictedElements.length > 0) {
var rElements = restrictedElements;
restrictedElements = [];
rElements.forEach(async function(video) {
await video.load();
});
setTimeout(function() {
var u = unblock;
unblock = [];
u.forEach(function(callback) { callback(); });
}, 1000);
}
while (queue.length < queueSize) {
var video = document.createElement('video');
video.load();
queue.push(video);
}
}
if (requiresUserGesture) {
window.addEventListener('keydown', removeBehaviorsRestrictions);
window.addEventListener('mousedown', removeBehaviorsRestrictions);
window.addEventListener('touchstart', removeBehaviorsRestrictions);
}
})();