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Timeline.js
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/**
* Timeline class
* By: Joshua Monson
* Date: October 2011
*
* The timeline class renders a Final Cut Pro-like timeline onto the browser window. It was designed with the purpose of creating and editing
* subtitles but it can be used for other purposes too.
**/
var Timeline = (function(TimedText,EditorWidgets){
"use strict";
var Proto,
lastTime = 0,
requestFrame = window.requestAnimationFrame || window.mozRequestAnimationFrame,
cancelFrame = window.cancelAnimationFrame || window.mozCancelAnimationFrame;
if(!TimedText){
throw new Error("TimedText Uninitialized");
}
if(!EditorWidgets || typeof EditorWidgets.CommandStack !== 'function'){
throw new Error("Missing CommandStack Constructor");
}
if(!requestFrame){
requestFrame = function(callback) {
var currTime = +(new Date),
timeToCall = Math.max(0, 16 - (currTime - lastTime)),
id = window.setTimeout(function() { callback(currTime + timeToCall); }, timeToCall);
lastTime = currTime + timeToCall;
return id;
};
cancelFrame = clearTimeout;
}
function Timeline(location, params) {
if(!(location instanceof HTMLElement)){ throw new Error("Invalid DOM Insertion Point"); }
if(!params){ params = {}; }
var getFor = params.getFor,
canvas = document.createElement('canvas'),
overlay = document.createElement('canvas'),
cache = document.createElement('canvas'),
node = document.createElement('div'),
cnode = document.createElement('div'),
media = (params.syncWith && typeof params.syncWith.addEventListener === 'function')?params.syncWith:null,
fonts = params.fonts || new Timeline.Fonts({}),
colors = params.colors || new Timeline.Colors({}),
images = params.images || new Timeline.Images({}),
cursors = params.cursors || new Timeline.Cursors({}),
width = params.width || location.offsetWidth,
length = params.length || 1800,
autoCueRepeat = !!params.autoCueRepeat,
lconf = (typeof params.confirm === 'function')?params.confirm:window.confirm,
trackSeeker = params.hasOwnProperty('trackSeeker')?!!params.trackSeeker:true,
currentTool = (typeof params.tool === 'number')?params.tool:Timeline.SELECT,
automove = !!params.automove,
abRepeatOn = false,
that = this;
Object.defineProperties(this,{
canGetFor: {
value: (typeof params.canGetFor === 'function')
?params.canGetFor:function(){ return false; }
},
getFor: {
value: (typeof getFor === 'function')
?function(whatfor,data,defs){
var datap = Promise.resolve(getFor(whatfor,data));
return datap.then(function(values){
//make sure errors for data with defaults are replaced with defaults
var defvalues = values.map(function(p,i){
var key = data[i];
if(typeof p.then !== 'function' || !defs.hasOwnProperty(key)){ return p; }
return p.then(void 0,function(){ return defs[key]; });
});
return Promise.all(defvalues);
});
}:function(_,data,defs){
var i, missing;
for(i=0;missing=data[i];i++){
if(!defs.hasOwnProperty(missing)){ break; }
}
return missing?
Promise.reject(new Error('Cannot retrieve '+missing+' data.')):
Promise.resolve(data.map(function(key){ return defs[key]; }));
}
},
fonts: {
get: function(){ return fonts; },
set: function(obj){ fonts = obj; this.render(); },
enumerable:true
},colors: {
get: function(){ return colors; },
set: function(obj){ colors = obj; this.render(); },
enumerable:true
},images: {
get: function(){ return images; },
set: function(obj){ images = obj; this.render(); },
enumerable:true
},cursors: {
get: function(){ return cursors; },
set: function(obj){ cursors = obj; this.render(); },
enumerable:true
},length: { // In seconds
get: function(){ return length; },
set: function(val){
var vlen, vend;
if(val !== length){
length = val;
vend = this.view.endTime;
vlen = vend - this.view.startTime;
if(length < vend){
this.view.endTime = length;
this.view.startTime = Math.max(0,length-vlen);
}
this.render();
}
return length;
},enumerable:true
},width: { // In pixels
get: function(){ return width; },
set: function(val){
var id;
if(val !== width){
width = +val;
canvas.width = width;
overlay.width = width;
cache.width = width;
for(id in this.audio){
this.audio[id].width = width;
}
// Re-render the timeline
this.render();
}
return width;
},enumerable: true
},timeMarkerPos: {
value: 0, writable: true
},commandStack: {
value: params.stack instanceof EditorWidgets.CommandStack ? params.stack : new EditorWidgets.CommandStack()
},
abRepeatSet: {
get: function(){ return !(this.repeatA === null || this.repeatB === null); }
},
abRepeatOn: {
get: function(){ return abRepeatOn; },
set: function(on){
on = this.abRepeatSet && (!!on);
if(abRepeatOn !== on){
abRepeatOn = on;
this.render();
this.emit(new Timeline.Event(on?'abrepeatenabled':'abrepeatdisabled'));
}
return on;
}
},
trackSeeker: {
get: function(){ return trackSeeker; },
set: function(val){
val = !!val;
if(val === trackSeeker){ return val; }
trackSeeker = val;
this.emit(new Timeline.Event(val?'trackseekeron':'trackseekeroff'));
return val;
}
},
currentTool: {
get: function(){ return currentTool; },
set: function(tool){
var ot = currentTool;
if(typeof tool === 'number' && tool !== currentTool){
currentTool = tool;
this.emit(new Timeline.Event('toolchange',{oldtool: ot, newtool: tool}));
}
return currentTool;
}
},
automove: {
get: function(){ return automove; },
set: function(val){
val = !!val;
if(val === automove){ return val; }
automove = val;
this.emit(new Timeline.Event(val?'automoveon':'automoveoff'));
return val;
}
},
autoCueRepeat: {
get: function(){ return autoCueRepeat; },
set: function(val){
val = !!val;
if(val === autoCueRepeat){ return val; }
autoCueRepeat = val;
this.emit(new Timeline.Event(val?'cuerepeaton':'cuerepeatoff'));
return val;
}
}
});
this.confirm = function(txt){
return Promise.resolve(lconf(txt));
};
this.autoSelect = !!params.autoSelect;
this.autoCueStatus = Timeline.AutoCueResolved;
this.autoCueStart = 0;
this.selectedSegments = [];
this.toCopy = [];
this.events = {};
this.tracks = [];
this.audio = {};
this.trackIndices = {};
this.activeElement = null;
this.activeIndex = -1;
this.sliderActive = false;
this.scrubActive = false;
this.slider = new Timeline.Slider(this);
this.view = new Timeline.View(this, params.start || 0, params.end || 60);
this.repeatA = null;
this.repeatB = null;
this.abRepeatSetting = false;
// Sizing
this.height = this.keyHeight + this.trackPadding + this.sliderHeight;
//rendering control
this.requestedTrack = null;
this.requestedFrame = 0;
//mouse control
this.mouseDown = false;
this.mouseDownPos = {x: 0, y: 0};
this.mousePos = {x: 0, y: 0};
this.scrollInterval = 0;
this.currentCursor = "pointer";
//context menu
this.activeMenu = null;
this.menuOptions = Timeline.Menu?[].slice.call(Timeline.Menu):[]; //just in case .Menu is overwritten
// Canvas
this.canvas = canvas;
this.context = canvas.getContext('2d');
canvas.width = width;
canvas.height = this.height;
canvas.addEventListener('mousemove', mouseMove.bind(this), false);
canvas.addEventListener('mouseup', mouseUp.bind(this), false);
canvas.addEventListener('mouseout', mouseOut.bind(this), false);
canvas.addEventListener('mousedown', mouseDown.bind(this), false);
canvas.addEventListener('mousewheel', mouseWheel.bind(this), false);
canvas.addEventListener('DOMMouseScroll', mouseWheel.bind(this), false); //Firefox
canvas.addEventListener('contextmenu', contextMenu.bind(this), false);
document.addEventListener('click', function(){
if(that.activeMenu){
that.activeMenu.parentNode.removeChild(that.activeMenu);
that.activeMenu = null;
}
},false);
this.overlay = overlay;
this.octx = overlay.getContext('2d');
overlay.width = width;
overlay.height = this.height;
overlay.style.position = "absolute";
overlay.style.top = 0;
overlay.style.left = 0;
overlay.style.pointerEvents = "none";
//This canvas is never seen, but it must be attached to the DOM for LTR text to render properly.
//No one knows why, it simply is so
this.cache = cache;
this.ctx = cache.getContext('2d');
cache.width = width;
cache.height = this.height;
cache.style.display = 'none';
node.style.position = "relative";
cnode.style.position = "relative";
cnode.appendChild(canvas);
cnode.appendChild(overlay);
cnode.appendChild(cache);
if(!params.hideControls && Timeline.ControlBar){
node.appendChild(Timeline.ControlBar(this, params.controls));
}
node.appendChild(cnode);
node.addEventListener('drop', dragDrop.bind(this), false);
node.addEventListener('dragover', dragOver.bind(this), false);
location.appendChild(node);
if(media){
media.addEventListener('loadedmetadata',setlen,false);
media.addEventListener('durationchange',setlen,false);
media.addEventListener("timeupdate",function(){ that.currentTime = media.currentTime; },false);
//this is simpler than updating every site that emits jump events
this.on('jump',function(e){ media.currentTime = e.time; });
}
this.render();
function setlen(){ that.length = media.duration; }
}
Timeline.ORDER = 0;
Timeline.SELECT = 1;
Timeline.MOVE = 2;
Timeline.CREATE = 3;
Timeline.DELETE = 4;
Timeline.REPEAT = 5;
Timeline.SPLIT = 6;
Timeline.SHIFT = 7;
Timeline.AutoCueResolved = 0;
Timeline.AutoCueCueing = 1;
Timeline.AutoCueRepeating = 2;
Timeline.Event = function(name,data){
var that = this, prevented = false;
if(typeof data === 'object'){
Object.keys(data).forEach(function(key){ that[key] = data[key]; });
}
this.timeStamp = +(new Date);
this.target = null;
this.type = name;
this.preventDefault = function(){ prevented = true; };
Object.defineProperty(this,'defaultPrevented',{get:function(){ return prevented; }});
};
Proto = Timeline.prototype;
Object.defineProperties(Proto,{
trackNames: {get: function(){ return Object.keys(this.trackIndices); }, enumerable: true }
});
// Sizing
Proto.trackHeight = 50;
Proto.trackPadding = 10;
Proto.sliderHeight = 25;
Proto.sliderHandleWidth = 10;
Proto.segmentTextPadding = 5;
Proto.keyTop = 0;
Proto.keyHeight = 25;
/** Event Triggers **/
Proto.emit = function(evt){
var that = this, fns = this.events[evt.type];
evt.target = this;
if(fns instanceof Array){ fns.forEach(function(cb){ try{cb.call(that,evt);}catch(ignore){} }); }
return !evt.defaultPrevented;
};
Proto.on = function(name, cb){
name = name.toLowerCase();
if(this.events.hasOwnProperty(name)){ this.events[name].push(cb); }
else{ this.events[name] = [cb]; }
};
Proto.off = function(name, cb){
var i;
name = name.toLowerCase();
if(!this.events.hasOwnProperty(name)){ return; }
i = this.events[name].indexOf(cb);
if(~i){ this.events[name].splice(i,1); }
};
/** Context menu functions*/
function clickMenu(action,pos,vars){
var tl = this.timeline;
if(tl.activeMenu){
tl.activeMenu.parentNode.removeChild(tl.activeMenu);
tl.activeMenu = null;
}
action.call(this,pos,vars);
}
function checkMenuSize(){
this.classList.remove('tl-menu-up');
if(this.getBoundingClientRect().bottom > window.innerHeight){
this.classList.add('tl-menu-up');
}
}
function buildOption(menu,pos,ovars,opt){
var ul, li,
vars = ovars;
if(typeof opt.vars === 'object'){
vars = Object.create(vars);
Object.keys(opt.vars).forEach(function(key){
vars[key] = opt.vars[key].call(this,pos,ovars);
},this);
}
if(typeof opt.condition === 'function' && !opt.condition.call(this,pos,vars)){ return; }
li = document.createElement('li');
li.innerHTML = "<a>"+String(
typeof opt.label === 'undefined'?opt.name:
typeof opt.label === 'function'?opt.label.call(this,pos,vars):opt.label
)+"</a>";
if(typeof opt.action === 'function'){
li.addEventListener('click',clickMenu.bind(this,opt.action,pos,vars),false);
}
ul = buildLevel(pos, opt, vars, this);
if(ul !== null){
li.appendChild(ul);
li.addEventListener('mouseover',checkMenuSize.bind(ul),false);
}
menu.appendChild(li);
}
function buildLevel(pos, level, ovars, that){
var menu = null;
if(level.submenu instanceof Array){
menu = document.createElement('ul');
level.submenu.forEach(buildOption.bind(that,menu,pos,ovars));
if(typeof level.calc === 'function'){
level.calc.call(that,buildOption.bind(that,menu,pos,ovars));
}
}else if(typeof level.calc === 'function'){
menu = document.createElement('ul');
level.calc.call(that,buildOption.bind(that,menu,pos,ovars));
}
return menu;
}
Proto.showMenu = function(pos){
var cvs = this.canvas,
top = (pos.y + cvs.offsetTop),
left = (pos.x + cvs.offsetLeft),
track = this.trackFromPos(pos),
menu = buildLevel(pos,{submenu:this.menuOptions},{},{
timeline: this,
track: track,
segment: track && track.segFromPos(pos)
});
if(left < cvs.offsetWidth/2){
menu.className = "tl-context-menu";
menu.style.left = left + 2 + "px";
}else{
menu.className = "tl-context-menu tl-menu-right";
menu.style.right = (cvs.parentNode.offsetWidth-left) + "px";
}
menu.style.top = top + "px";
cvs.parentNode.appendChild(menu);
if(menu.getBoundingClientRect().bottom > window.innerHeight){
menu.style.top = 'auto';
menu.style.bottom = (cvs.parentNode.offsetHeight-top) + "px";
}
this.activeMenu = menu;
};
Proto.addMenuItem = function(path,config){ //label, action, condition, calc, index
var optname, idx, opt,
sequence = path.split('.'),
submenu = this.menuOptions;
if(typeof config !== 'object'){ config = {}; }
if(!sequence.length){ throw new Error("No Path"); }
opt = {submenu:submenu};
do{ if(!opt.hasOwnProperty('submenu')){ opt.submenu = []; }
submenu = opt.submenu;
optname = sequence.shift();
for(idx = 0; (opt = submenu[idx]) && opt.name !== optname; idx++){
//console.log(optname,opt);
}
if(idx === submenu.length){
opt = {name:optname};
if(typeof config.index === 'number'){
submenu.splice(Math.floor(config.index),0,opt);
}else{
submenu.push(opt);
}
}
}while(sequence.length);
opt.label = config.label;
if(typeof config.vars === 'object'){
opt.vars = config.vars;
}
if(typeof config.action === 'function'){
opt.action = config.action;
}
if(typeof config.calc === 'function'){
opt.calc = config.calc;
}
if(typeof config.condition === 'function'){
opt.condition = config.condition;
}
};
Proto.getMenuItems = function(path){
var optname, idx, opt,
sequence = path.split('.'),
submenu = this.menuOptions;
opt = {submenu:submenu};
do{ if(!opt.hasOwnProperty('submenu')){ return []; }
submenu = opt.submenu;
optname = sequence.shift();
for(idx = 0; (opt = submenu[idx]) && opt.name !== optname; idx++){
//console.log(optname,opt);
}
if(idx === submenu.length){ return []; }
}while(sequence.length);
return opt.submenu.slice();
};
/**
* Helper Functions
*
* These functions deal with manipulating the data
**/
Proto.timeInView = function(time){
return time < this.view.endTime && time > this.view.startTime;
};
Proto.spanInView = function(start, end){
return start < this.view.endTime && end > this.view.startTime;
};
Proto.getTrackTop = function(track) {
return this.keyHeight + this.trackPadding + (this.trackIndices[track.id] * (this.trackHeight + this.trackPadding));
};
Proto.getTrack = function(id){
return this.trackIndices.hasOwnProperty(id)?this.tracks[this.trackIndices[id]]:null;
};
Proto.trackFromPos = function(pos) {
return this.tracks[this.indexFromPos(pos)]||null;
};
Proto.segFromPos = function(pos) {
var track = this.tracks[this.indexFromPos(pos)];
if(!track){ return null; }
return track.segFromPos(pos);
};
Proto.indexFromPos = function(pos){
var i, bottom,
padding = this.trackPadding,
height = this.trackHeight,
top = this.keyHeight + this.trackPadding;
for(i = 0; i < this.tracks.length; i++, top = bottom + padding) {
bottom = top + height;
if(pos.y >= top && pos.y <= bottom){ return i; }
}
return -1;
};
function resolveTrack(timeline, tid){
var indices = timeline.trackIndices,
track = (tid instanceof Timeline.TextTrack)?tid:
indices.hasOwnProperty(tid)?timeline.tracks[indices[tid]]:
null;
if(!track){ throw new Error("Track "+tid+" Does Not Exist"); }
return track;
}
function swaptracks(n,o){
this.tracks[this.trackIndices[n.id]] = n;
n.render();
this.commandStack.removeEvents(o.id);
this.emit(new Timeline.Event("removetrack",{track:o}));
this.emit(new Timeline.Event("addtrack",{track:n}));
}
Proto.hasTextTrack = function(name){
return this.trackIndices.hasOwnProperty(name);
};
function addTlTextTrack(track){
if(this.trackIndices.hasOwnProperty(track.id)){
swaptracks.call(this,track,this.tracks[this.trackIndices[track.id]]);
}else{
this.trackIndices[track.id] = this.tracks.length;
this.tracks.push(track);
// Adjust the height
this.height += this.trackHeight + this.trackPadding;
this.canvas.height = this.height;
this.overlay.height = this.height;
this.cache.height = this.height;
this.render();
this.emit(new Timeline.Event("addtrack",{track:track}));
}
}
Proto.addTextTrack = function(textTrack,mime,overwrite) {
if(!overwrite && this.trackIndices.hasOwnProperty(textTrack.label)){
throw new Error("Track name already in use.");
}
addTlTextTrack.call(this, new Timeline.TextTrack(this, textTrack, mime));
};
Proto.removeTextTrack = function(id) {
var i,t,track,aid,loc;
if(this.trackIndices.hasOwnProperty(id)){
loc = this.trackIndices[id];
aid = this.tracks[loc].audioId;
if(this.audio.hasOwnProperty(aid)){ this.audio[aid].references--; }
track = this.tracks.splice(loc, 1)[0];
delete this.trackIndices[id];
for(i=loc;t=this.tracks[i];i++){
this.trackIndices[t.id] = i;
}
// Adjust the height
this.height -= this.trackHeight + this.trackPadding;
this.canvas.height = this.height;
this.overlay.height = this.height;
this.cache.height = this.height;
this.render();
this.commandStack.removeEvents(track.id);
this.emit(new Timeline.Event("removetrack",{track:track}));
}
};
Proto.cloneTimeCodes = function(tid, kind, lang, name, mime, overwrite) {
if(!overwrite && this.trackIndices.hasOwnProperty(name)){
throw new Error("Track name already in use.");
}
addTlTextTrack.call(this, resolveTrack(this, tid).cloneTimeCodes(kind, lang, name, mime));
this.commandStack.setFileUnsaved(name);
};
Proto.cloneTrack = function(tid, kind, lang, name, mime, overwrite) {
if(!overwrite && this.trackIndices.hasOwnProperty(name)){
throw new Error("Track name already in use.");
}
addTlTextTrack.call(this, resolveTrack(this, tid).cloneTrack(kind, lang, name, mime));
this.commandStack.setFileUnsaved(name);
};
function undoAlterTextTrack(tid, kind, lang, name, overwrite){
var track = resolveTrack(this, tid);
if((typeof name !== 'undefined') && (name !== track.id)){
if(this.trackIndices.hasOwnProperty(name)){
if(!overwrite){ throw new Error("Track name already in use."); }
this.removeTextTrack(name);
}
this.trackIndices[name] = this.trackIndices[track.id];
delete this.trackIndices[track.id];
this.commandStack.renameEvents(track.id,name);
track.textTrack.label = name;
}
//avoid side-effects of setting track properties directly
if(typeof kind !== 'undefined'){ track.textTrack.kind = kind; }
if(typeof lang !== 'undefined'){ track.textTrack.language = lang; }
this.render();
};
Proto.alterTextTrack = function(tid, kind, lang, name, overwrite){
var undo, redo,
track = resolveTrack(this, tid),
oname = track.textTrack.label,
okind = track.textTrack.kind,
olang = track.textTrack.language;
//Set up the undo/redo functions
undo = undoAlterTextTrack.bind(
this, name,
okind, olang,
oname, overwrite
);
redo = undoAlterTextTrack.bind(
this, oname,
kind, lang,
name, overwrite
);
this.commandStack.push({
file: oname,
redo: redo,
undo: undo
});
//perform the edit
redo();
}
Proto.setAutoCue = function(onoff, tid) {
if(typeof tid === 'undefined'){
this.tracks.forEach(function(track){ track.autoCue = onoff; });
return;
}
if(typeof tid.map === 'function'){
tid.map(resolveTrack.bind(this)).forEach(function(t){ t.autoCue = onoff; });
}else{
resolveTrack(this, tid).autoCue = onoff;
}
};
/** Audio Functions **/
Proto.addAudioTrack = function(wave, id) {
var track;
if(this.audio.hasOwnProperty(id)){ throw new Error("Track with that id already loaded."); }
if(wave instanceof Timeline.AudioTrack){
track = wave;
id = wave.id;
}else{
track = new Timeline.AudioTrack(this, wave, id);
}
this.audio[id] = track;
this.render();
};
Proto.loadAudioTrack = function(source, id) {
var rate = 1001, bufsize = 10000,
chansize, buffer, channels, resampler,
reader = Reader[(source instanceof File?"fromFile":"fromURL")](source),
wave = new WaveForm(
this.width,
this.trackHeight,
1/*channels*/,rate
);
this.addAudioTrack(wave, id);
console.log("Initializing Audio Decoder");
console.time("audio "+id);
reader.on('format', function(data) {
console.log("Decoding Audio...");
channels = data.channelsPerFrame;
bufsize -= bufsize%channels;
buffer = new Float32Array(bufsize);
chansize = bufsize/channels;
resampler = new Resampler({
from: data.sampleRate,
to: rate,
bitrate: 32,
channels: 1,
//smaller buffers mean smoother drawing
//large buffers mean slight speed increases
bufferSize: 256
});
resampler.on('data', function(channels){
wave.addFrame(channels[0]); //addFrame emits redraw
});
});
reader.on('ready', getData);
reader.start();
function getData(){
var i, j, chan;
if(reader.get(buffer) !== 'filled'){
resampler.flush();
console.log("Finished Decoding");
console.timeEnd("audio "+id);
}else{
//deinterlace; select only the first channel
chan = new Float32Array(chansize);
for(i=0,j=0;j<bufsize;i++,j+=channels){
chan[i] = buffer[j];
}
resampler.append([chan]);
setTimeout(getData,0);
}
}
};
Proto.removeAudioTrack = function(id){
var i, top, ctx, track;
if(!this.audio.hasOwnProperty(id)){ return; }
if(this.audio[id].references){
top = this.keyHeight+this.trackPadding;
ctx = this.octx;
for(i=0;track=this.tracks[i];i++){
if(track.active && track.audioId === id){
ctx.clearRect(0, top, this.width, this.trackHeight);
}
top += this.trackHeight + this.trackPadding;
}
}
delete this.audio[id];
};
Proto.setAudioTrack = function(tid, aid){
var track = resolveTrack(this, tid);
if(this.audio.hasOwnProperty(track.audioId)){ this.audio[track.audioId].references--; }
track.audioId = aid;
if(this.audio.hasOwnProperty(aid)){
this.audio[aid].references++;
this.audio[aid].render();
}
};
Proto.unsetAudioTrack = function(tid){
var track = resolveTrack(this, tid),
audio = this.audio[track.audioId];
if(audio){
track.audioId = null;
audio.references--;
this.octx.clearRect(0, this.getTrackTop(track), this.width, this.trackHeight);
}
};
function getLineBuffer(source){
return (new Promise(function(resolve,reject){
var reader;
if(source instanceof File){
reader = new FileReader();
reader.onerror = reject;
reader.onload = function(evt) {
resolve([evt.target.result,source.type || TimedText.inferType(source.name)]);
};
reader.readAsText(source);
}else if(typeof source === "string" || source instanceof String){
reader = new XMLHttpRequest();
reader.open('GET', source, true);
reader.onerror = reject;
reader.onload = function() {
resolve([this.responseText,this.getResponseHeader('content-type')]);
};
reader.send(null);
}else if(source instanceof Object){
resolve([source.content,source.mime || TimedText.inferType(source.name)]);
}
})).then(function(arr){
var text = arr[0], mime = arr[1];
try{ return TimedText.parse(mime,text).cueList.map(function(cue){ return cue.text; }); }
catch(_){ return text.split('\n'); }
});
};
Proto.loadLineBuffer = function(tid,src){
var track = resolveTrack(this, tid);
getLineBuffer(src).then(function(lines){
lines.reverse();
track.linebuffer = lines;
});
};
Proto.clearLineBuffer = function(tid){
resolveTrack(this, tid).linebuffer = [];
};
Proto.addSegment = function(tid, cue, select){
resolveTrack(this, tid).add(cue, select);
};
/** Drawing functions **/
function renderBackground(tl) {
var ctx = tl.ctx,
grd = ctx.createLinearGradient(0,0,0,tl.height);
// Draw the backround color
grd.addColorStop(0,tl.colors.bgTop);
grd.addColorStop(0.5,tl.colors.bgMid);
grd.addColorStop(1,tl.colors.bgBottom);
ctx.save();
ctx.fillStyle = grd;
ctx.globalCompositeOperation = "source-over";
ctx.fillRect(0, 0, tl.width, tl.height);
ctx.restore();
}
function renderKey(tl) {
var ctx = tl.ctx,
view = tl.view,
zoom = view.zoom,
font = tl.fonts.key,
power, d=0,
hours, mins, secs, pixels,
start, end, position, offset, increment;
ctx.save();
ctx.font = font.font;
ctx.fillStyle = font.color;
ctx.strokeStyle = font.color;
ctx.textBaseline = 'top';
// Find the smallest increment in powers of 2 that gives enough room for 1-second precision
power = Math.ceil(Math.log(ctx.measureText(" 0:00:00").width*zoom)/0.6931471805599453);
increment = Math.pow(2,power);
pixels = increment/zoom;
//if we're below 1-second precision, adjust the increment to provide extra room
if(power < 0){
d = power<-2?3:-power;
if(pixels < ctx.measureText(" 0:00:0"+(0).toFixed(d)).width){
increment*=2;
pixels*=2;
d--;
}
}
start = view.startTime;
start -= start%increment;
end = view.endTime;
offset = tl.canvas.dir === 'rtl' ? -2 : 2;
for (position = view.timeToPixel(start); start < end; start += increment, position += pixels) {
// Draw the tick
ctx.beginPath();
ctx.moveTo(position, tl.keyTop);
ctx.lineTo(position, tl.keyTop + tl.keyHeight);
ctx.stroke();
// Now put the number on
secs = start % 60;
mins = Math.floor(start / 60);
hours = Math.floor(mins / 60);
mins %= 60;
ctx.fillText(
hours + (mins<10?":0":":") + mins + (secs<10?":0":":") + secs.toFixed(d), position + offset,
tl.keyTop + 2
);
}
ctx.restore();
}
function renderABRepeat(tl) {
if(!tl.abRepeatSet) { return; }
var left = tl.view.timeToPixel(tl.repeatA),
right = tl.view.timeToPixel(tl.repeatB),
ctx = tl.ctx;
ctx.save();
ctx.fillStyle = tl.colors[tl.abRepeatOn?'abRepeat':'abRepeatLight'];
ctx.fillRect(left, 0, right-left, tl.height);
ctx.restore();
}
function renderTimeMarker(tl, x) {
var ctx = tl.context;
ctx.save();
ctx.fillStyle = tl.colors.timeMarker;
ctx.fillRect(x, 0, 2, tl.height);
ctx.restore();
}
function renderTrack(tid) {
var left, right, ctx,
track = resolveTrack(this, tid),
top = this.getTrackTop(track),
height = this.trackHeight,
x = this.view.timeToPixel(this.timeMarkerPos)-1;
track.render();
//redo the peice of the abRepeat that we drew over
if(this.abRepeatSet){
left = this.view.timeToPixel(this.repeatA);
right = this.view.timeToPixel(this.repeatB);
if(right >= 0 || left <= this.width){
ctx = this.ctx;
ctx.save();
ctx.fillStyle = this.colors[this.abRepeatOn?'abRepeat':'abRepeatLight'];
ctx.fillRect(left, top, right-left, height);
ctx.restore();
}
}
ctx = this.context;
//This copy is expensive; need to make it faster!
ctx.drawImage(this.cache,0,top,this.width,height,0,top,this.width,height);
//redo the peice of the timeMarker that we drew over
if(x >= 0 || x <= this.width){
ctx.save();
ctx.fillStyle = this.colors.timeMarker;
ctx.fillRect(x, top, 2, height);
ctx.restore();
}
this.requestedTrack = null;
this.requestedFrame = 0;
}
function render(stable) {
var aid, x;
if(this.images.complete){
if(!stable){
renderBackground(this);
renderKey(this);
this.tracks.forEach(function(track){ track.render(); });
for(aid in this.audio){ this.audio[aid].render(); }
renderABRepeat(this);
this.context.drawImage(this.cache,0,0);
}
x = this.view.timeToPixel(this.timeMarkerPos)-1;
if(x >= -1 && x < this.width){
renderTimeMarker(this,x);
}
this.slider.render();
this.requestedTrack = null;
this.requestedFrame = 0;
}else{
this.requestedTrack = null;
this.requestedFrame = requestFrame(render.bind(this,stable));
}
}