-
Notifications
You must be signed in to change notification settings - Fork 0
/
video.js-e
714 lines (639 loc) · 21.2 KB
/
video.js-e
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
# Copyright (c) 2015, Empirical Modelling Group
# All rights reserved.
#
# See LICENSE.txt
#Bugs:
#Assigning to _chapters causes a jump back to the beginning of the current chapter.
#Triggered procedures are possibly called twice when making assignments?
#If _paused is defined by dependency and is true while seeking then the video starts playing while the mouse button is still held down.
#Attempting to play back video in reverse (vid_speed < 0) only works on Safari on Mac. A workaround is possible.
#Loading a new video file will reset the playback speed to 1.
#Assigning "end" to _chapter gives improper _time.
#Todo:
#Add ability to set audio player width using _width
#Add a _duration observable (assigning prevents playing past that point). Change .duration to .maximumDuration
#Add support for poster images.
#Add click in video area to play/pause.
#Add feedback for downloading issues.
#Add mode that draws the video onto the canvas.
#Useful site for extracting YouTube video URLs: http://www.downvids.net/
#Alternative site: http://www.youtubeinmp4.com/
#MP3 files: http://www.mfiles.co.uk/mp3-files.htm
#For a Video drawable named "vid", the following observables are available. All are read/write.
#
#vid_url
# The URL of the current video loaded into the video player.
#
#vid_position
# A Point object representing the position of the video player on the canvas.
#
#vid_size
# A Point object representing the width and height of the video as it is displayed on the canvas.
#
#vid_scale
# A number representing the canvas scale factor used to express vid_size.
#
#vid_controls
# Whether or not the built-in playback controls are available to the user or not.
#
#vid_paused
# True if the video is not currently playing and false if it is playing or if it should be played
# as soon as it has finished loading. Note that if vid_paused is determined by dependency and the
# user overrides this decision by pausing or resuming playback using the playback controls then
# the value of vid_paused will not reflect the true status of the video playback. Also, if
# vid_paused is determined by dependency and equals true when the end of the video is reached then
# the video will play again from the beginning.
#
#vid_time
# The current temporal position of the video, accurate to the nearest second. Cannot be set by
# dependency unless the video is kept paused.
#
#vid_chapters and vid_chapter
# If defined then vid_chapters should be an object where the keys are labels attributed to certain
# sections of the video and the values are the times when these sections begin. For example, if
# vid_chapters is {lesson1: 60, lesson2: 900} then vid_chapter will contain the string "start"
# during the first 60 seconds of playback, contain the string "lesson1" between 60 seconds through
# to 15 minutes into the video, at which point the second lesson begins and vid_chapter will
# become "lesson2". When the video has finished playing vid_chapter will become "end".
#
#vid_speed
# Determines the speed of video playback, e.g. 1 for normal speed or 2 to play back at double
# speed. Setting the speed to zero pauses the video and assigns the value true to vid_paused
# unless vid_paused is calculated by dependency. If vid_speed is set to zero then subsequently
# assigning another value to vid_speed won't automatically resume playback unless vid_paused is
# calculated by dependency. If vid_speed is zero when the video becomes unpaused, either by
# the value of vid_paused changing from true to false or by the user clicking on the play button,
# then the speed will be reset to 1.
#
#vid_volume
# The current volume level of the video's soundtrack, between 0 and 1. If vid_volume is specified
# by dependency and playback controls are enabled and the user uses them to adjust the volume
# then then the dependency will be overwritten by an implicit assignment.
#
#Useful properties of the drawable object itself:
#
#.duration
# The duration of the currently loaded video file (read-only).
#
#Useful methods of the drawable object itself:
#
#.unmute()
# Restores the volume to its previous level if currently playing silently.
#Example:
/*
vid_url = "...";
vid is Video();
picture is [vid];
#Stop to complete an exercise 60 seconds into the video.
exercisePoints = [60];
exercisesCompleted = [false];
exerciseNumber is positionInList(vid_time, exercisePoints);
vid_controls is exerciseNumber == 0 || exercisesCompleted[exerciseNumber];
vid_paused is vid_controls == false;
*/
func Video {
${{
var argsProcessed;
var name;
if (typeof(arguments[0]) == "string") {
name = arguments[0];
argsProcessed = 1;
} else {
name = root.currentObservableName();
argsProcessed = 0;
if (name === undefined) {
eden.error(new Error("Video: Every video must have a name."), "error");
return undefined;
}
}
var preload;
if (argsProcessed < arguments.length) {
preload = arguments[argsProcessed];
} else {
preload = false;
}
return new Audiovisual(name, "Video", preload);
}}$;
}
func Audio {
${{
var argsProcessed;
var name;
if (typeof(arguments[0]) == "string") {
name = arguments[0];
argsProcessed = 1;
} else {
name = root.currentObservableName();
argsProcessed = 0;
if (name === undefined) {
eden.error(new Error("Audio: Every audio player must have a name."), "error");
return undefined;
}
}
var preload;
if (argsProcessed < arguments.length) {
preload = arguments[argsProcessed];
} else {
preload = false;
}
return new Audiovisual(name, "Audio", preload);
}}$;
}
${{
window.Audiovisual = function(name, type, preload) {
this.name = name;
this.obsName = root.currentObservableName();
this.type = type;
this.preload = preload;
this.atEnd = false;
Object.defineProperty(this, "duration", {
enumerable: true,
get: function () {
if (this.elements === undefined || !this.elements[0].duration) {
return 0;
} else {
return this.elements[0].duration;
}
}
});
}
Audiovisual.prototype.hash = function () {
return this.name;
}
function getMediaElement(audiovisual) {
return audiovisual.elements[0];
}
function loadMedia(audiovisual) {
var mediaElement = getMediaElement(audiovisual);
mediaElement.autoplay = !root.lookup(audiovisual.name + "_paused").value();
if (audiovisual.preload) {
mediaElement.preload = "auto";
} else {
mediaElement.preload = "metadata";
}
mediaElement.load();
}
Audiovisual.prototype.reload = function () {
var mediaElement = getMediaElement(this);
var position = mediaElement.currentTime;
loadMedia(this);
mediaElement.currentTime = position;
};
Audiovisual.prototype.unmute = function () {
getMediaElement(this).muted = false;
}
Audiovisual.prototype.draw = function (context) {
if (this.elements === undefined ) {
var me = this;
var name = this.name;
var agent = EdenSymbol.localJSAgent;
root.beginAutocalcOff();
//Create HTML tag
var mediaElement = document.createElement(this.type.toLowerCase());
//Symbols not unique to videos
var chapterSym = root.lookup(name + "_chapter");
var chapterMarksSym = root.lookup(name + "_chapters");
var loopSym = root.lookup(name + "_looping");
var pausedSym = root.lookup(name + "_paused");
var positionSym = root.lookup(name + "_position");
var speedSym = root.lookup(name + "_speed");
var timeSym = root.lookup(name + "_time");
var urlSym = root.lookup(name + "_url");
var volumeSym = root.lookup(name + "_volume");
//Chapters
var chapterMarks, chapterNames, chapterIndex, nextChapterAt;
var goToChapter = function () {
var numChapters = chapterMarks.length;
if (chapterIndex == -1) {
if (numChapters > 0 && chapterMarks[0] == 0) {
chapterIndex = 0;
}
}
var chapterName;
if (chapterIndex == -1) {
chapterName = "start";
} else if (chapterIndex == numChapters) {
chapterName = "end";
me.atEnd = true;
} else {
chapterName = chapterNames[chapterIndex];
}
if (chapterName != chapterSym.value()) {
chapterSym.assign(chapterName, root.scope, EdenSymbol.defaultAgent);
}
if (chapterIndex < numChapters - 1) {
nextChapterAt = chapterMarks[chapterIndex + 1];
} else {
nextChapterAt = undefined;
}
};
var setChapters = function (symbol, chapters) {
chapterMarks = [];
chapterNames = [];
chapterIndex = -1;
nextChapterAt = undefined;
if (chapters instanceof Object) {
for (var chapterName in chapters) {
var beginsAt = chapters[chapterName];
var i = 0;
while (i < chapterMarks.length) {
if (beginsAt < chapterMarks[i]) {
break;
}
i++;
}
chapterMarks.splice(i, 0, beginsAt);
chapterNames.splice(i, 0, chapterName);
}
if (!me.atEnd) {
var currentPos = timeSym.value();
while (chapterIndex < chapterMarks.length - 1 &&
currentPos >= chapterMarks[chapterIndex + 1]) {
chapterIndex++;
}
goToChapter();
}
}
}; //end of function
if (chapterMarksSym.value() === undefined && chapterMarksSym.definition === undefined) {
chapterMarksSym.assign({}, root.scope, EdenSymbol.defaultAgent);
}
setChapters(chapterMarksSym, chapterMarksSym.value());
chapterMarksSym.addJSObserver("setChapters", setChapters);
chapterSym.addJSObserver("jumpToChapter", function (symbol, value) {
var currentTime = mediaElement.currentTime;
var numChapters = chapterMarks.length;
var newTime;
if (value == "start") {
chapterIndex = -1;
newTime = 0;
} else if (value == "end") {
chapterIndex = numChapters;
newTime = mediaElement.duration;
} else {
var found = false;
for (var i = 0; i < numChapters; i++) {
if (value == chapterNames[i]) {
chapterIndex = i;
newTime = chapterMarks[chapterIndex];
break;
}
}
}
if (newTime !== undefined) {
timeSym.assign(newTime, root.scope, agent);
mediaElement.currentTime = newTime;
goToChapter();
}
});
//Looping
var initialLooping = loopSym.value();
if (initialLooping === undefined && loopSym.definition === undefined) {
loopSym.assign(false, root.scope, EdenSymbol.defaultAgent);
} else if (initialLooping) {
mediaElement.loop = true;
}
loopSym.addJSObserver("setLooping", function (sym, value) {
mediaElement.loop = value;
});
//Playback controls
if (this.type == "Video") {
var controlsSym = root.lookup(name + "_controls");
var controls = controlsSym.value();
if (controls === undefined) {
if (controlsSym.definition === undefined) {
controlsSym.assign(true, root.scope, agent);
} else {
mediaElement.controls = true;
}
} else {
mediaElement.controls = controls;
}
controlsSym.addJSObserver("showHideControls", function (symbol, showControls) {
mediaElement.controls = showControls;
});
} else {
mediaElement.controls = true;
}
//Position on screen
mediaElement.className = "canvashtml-item";
this.cachedOrigin = new Point(0, 0);
this.cachedScaleFactor = 1;
var position = positionSym.value();
if (position === undefined) {
position = new Point(0, 0);
positionSym.assign(position, root.scope, EdenSymbol.defaultAgent);
}
positionSym.addJSObserver("reposition", function (sym, position) {
me.doTranslation(position);
});
//Size
this.cachedZoom = 1;
if (this.type == "Video") {
var sizeSym = root.lookup(name + "_size");
var scaleSym = root.lookup(name + "_scale");
var size = sizeSym.value();
sizeSym.addJSObserver("resize", function (symbol, size) {
var scale = scaleSym.value();
if (scale !== undefined) {
me.doScaling(size, scale);
}
});
scaleSym.addJSObserver("resize", function (symbol, scale) {
if (scale !== undefined) {
me.doScaling(sizeSym.value(), scale);
}
});
mediaElement.addEventListener("loadedmetadata", function (event) {
if (sizeSym.value() === undefined) {
root.beginAutocalcOff();
scaleSym.assign(1, root.scope, agent);
sizeSym.assign(new Point(mediaElement.videoWidth, root.scope, mediaElement.videoHeight), agent);
root.endAutocalcOff();
}
});
} else {
}
//Paused or playing
var beginPaused = pausedSym.value();
if (beginPaused === undefined && pausedSym.definition === undefined) {
pausedSym.assign(true, root.scope, agent);
} else if (beginPaused == false) {
mediaElement.autoplay = true;
}
pausedSym.addJSObserver("pausePlay", function (symbol, pause) {
if (pause) {
mediaElement.pause();
} else {
me.atEnd = false;
mediaElement.play();
}
});
mediaElement.addEventListener("pause", function (event) {
if (pausedSym.definition === undefined) {
pausedSym.assign(true, root.scope, agent);
}
});
mediaElement.addEventListener("playing", function (event) {
if (pausedSym.definition === undefined) {
pausedSym.assign(false, root.scope, agent);
}
if (speedSym.value() == 0) {
mediaElement.defaultPlaybackRate = 1;
mediaElement.playbackRate = 1;
}
});
//Seeking and time moving forward
var time = timeSym.value();
if (time !== undefined) {
mediaElement.currentTime = parseFloat(time);
} else if (timeSym.definition === undefined) {
timeSym.assign(0, root.scope, EdenSymbol.defaultAgent);
}
function findChapter() {
var oldChapterIndex = chapterIndex;
var numChapters = chapterMarks.length;
if (me.atEnd) {
//Seeked to the end (and not looping)
chapterIndex = numChapters;
} else {
var currentTime = mediaElement.currentTime;
if (nextChapterAt !== undefined && currentTime >= nextChapterAt) {
//Seeking forward
while (chapterIndex < numChapters - 1 && currentTime >= chapterMarks[chapterIndex + 1]) {
chapterIndex++;
}
} else {
//Seeking backward
if (chapterIndex == numChapters) {
chapterIndex--;
}
while (chapterIndex >= 0 && chapterMarks[chapterIndex] > currentTime) {
chapterIndex--;
}
}
}
if (chapterIndex != oldChapterIndex) {
goToChapter();
}
}
timeSym.addJSObserver("seek", function (symbol, seconds) {
if (symbol.last_modified_by !== me.type) {
mediaElement.currentTime = seconds;
}
});
mediaElement.addEventListener("timeupdate", function (event) {
if (mediaElement.paused) {
return;
}
var currentTime = mediaElement.currentTime;
var newTimeIndex = Math.floor(currentTime);
if (newTimeIndex != me.timeIndex) {
timeSym.assign(newTimeIndex, root.scope, agent);
me.timeIndex = newTimeIndex;
}
if (nextChapterAt !== undefined && currentTime >= nextChapterAt) {
chapterIndex++;
chapterSym.assign(chapterNames[chapterIndex], root.scope, agent);
if (chapterIndex < chapterMarks.length - 1) {
nextChapterAt = chapterMarks[chapterIndex]
} else {
nextChapterAt = undefined;
}
}
});
mediaElement.addEventListener("ended", function (event) {
timeSym.assign(mediaElement.duration, root.scope, agent);
chapterIndex = chapterMarks.length;
goToChapter();
});
mediaElement.addEventListener("seeking", function (event) {
var currentTime = mediaElement.currentTime;
if (timeSym.value() !== currentTime) {
timeSym.assign(currentTime, root.scope, agent);
}
me.atEnd = currentTime == mediaElement.duration;
findChapter();
});
mediaElement.addEventListener("seeked", function (event) {
var isPaused = pausedSym.value();
me.timeIndex = Math.floor(mediaElement.currentTime);
if (!isPaused) {
mediaElement.play();
}
});
//Playback speed
var speedResetOnLoad;
var speed = speedSym.value();
if (speed === undefined) {
speedSym.assign(1, root.scope, EdenSymbol.defaultAgent);
} else if (speed > 0) {
mediaElement.defaultPlaybackRate = speed;
}
speedSym.addJSObserver("changePlaybackSpeed", function (symbol, speed) {
if (mediaElement.playbackRate != speed) {
if (speed > 0) {
mediaElement.defaultPlaybackRate = speed;
} else {
mediaElement.defaultPlaybackRate = 1;
}
mediaElement.playbackRate = speed;
}
});
mediaElement.addEventListener("ratechange", function (event) {
root.beginAutocalcOff();
var speed = mediaElement.playbackRate;
if (speedSym.definition === undefined) {
speedSym.assign(speed, root.scope, agent);
}
if (speed == 0) {
mediaElement.pause();
} else if (!pausedSym.value()) {
mediaElement.play();
}
root.endAutocalcOff();
});
//Volume
var volume = volumeSym.value();
if (volume === undefined) {
volumeSym.assign(1, root.scope, EdenSymbol.defaultAgent);
} else if (volume == 0) {
mediaElement.muted = true;
} else {
mediaElement.volume = volume;
}
this.volumeChanging = false;
volumeSym.addJSObserver("adjustVolume", function (symbol, volume) {
if (!me.volumeChanging) {
me.volumeChanging = true;
if (symbol.definition === undefined) {
if (volume == 0) {
mediaElement.muted = true;
} else {
mediaElement.muted = false;
mediaElement.volume = volume;
}
} else {
mediaElement.volume = volume;
}
me.volumeChanging = false;
}
});
mediaElement.addEventListener("volumechange", function (event) {
if (!me.volumeChanging) {
me.volumeChanging = true;
var oldVolume = volumeSym.value();
var newVolume = mediaElement.volume;
if (mediaElement.muted) {
if (volumeSym.definition === undefined) {
volumeSym.assign(0, root.scope, agent);
}
} else if (oldVolume != newVolume) {
if (volumeSym.definition === undefined) {
volumeSym.assign(newVolume, root.scope, agent);
} else {
mediaElement.volume = oldVolume;
}
}
me.volumeChanging = false;
}
});
//Loading a video file
var url = urlSym.value();
if (url !== undefined) {
if (this.preload) {
mediaElement.preload = "auto";
} else {
mediaElement.preload = "metadata";
}
mediaElement.src = url;
}
urlSym.addJSObserver("newVideo", function (symbol, url) {
if (url != mediaElement.src) {
timeSym.assign(0, root.scope, agent);
me.timeIndex = 0;
chapterIndex = -1;
goToChapter();
mediaElement.src = url;
loadMedia(me);
}
});
//Mouse Zones
if (this.type == "Video") {
mediaElement.onmousedown = function (event) {
var mouseFollow = root.lookup("mouseFollow").value();
root.lookup("mouseDownZone").assign(me.name, root.scope, EdenSymbol.hciAgent, mouseFollow);
};
mediaElement.onmouseup = function (event) {
edenUI.plugins.Canvas2D.endClick();
};
edenUI.plugins.Canvas2D.initZoneFromName(this.name, this.type)
}
mediaElement.onmouseenter = function (event) {
var mouseFollow = root.lookup("mouseFollow").value();
root.lookup("mouseZone").assign(me.name, root.scope, EdenSymbol.hciAgent, mouseFollow);
};
//Finalize creation
this.elements = [mediaElement];
root.endAutocalcOff();
}
}
Audiovisual.prototype.scale = function (scale, zoom , origin) {
this.cachedScaleFactor = scale;
this.cachedOrigin = origin;
var name = this.name;
var position = root.lookup(name + "_position").value();
this.doTranslation(position);
if (this.type == "Video") {
this.cachedZoom = zoom;
var scaleSym = root.lookup(name + "_scale");
var videoScale = scaleSym.value();
if (videoScale === undefined) {
videoScale = scale / zoom;
scaleSym.assign(videoScale, root.scope, root.lookup(this.type));
} else {
var size = root.lookup(name + "_size").value();
this.doScaling(size, videoScale);
}
}
}
Audiovisual.prototype.doScaling = function (size, scale) {
if (size instanceof Point) {
var element = this.elements[0];
var scaleFactor = this.cachedZoom * scale;
element.width = size.x * scaleFactor;
element.height = size.y * scaleFactor;
}
}
Audiovisual.prototype.doTranslation = function (position) {
if (position instanceof Point) {
var style = this.elements[0].style;
var origin = this.cachedOrigin;
var scaleFactor = this.cachedScaleFactor;
style.left = ((origin.x + position.x) * scaleFactor) + "px";
style.top = ((origin.y + position.y) * scaleFactor) + "px";
}
}
Audiovisual.prototype.toString = function () {
if (this.name == this.obsName) {
return this.type + "(" + Eden.edenCodeForValues(this.preload) + ")";
} else {
return this.type + "(" + Eden.edenCodeForValues(this.name, this.preload) + ")";
}
}
Audiovisual.prototype.getEdenCode = Audiovisual.prototype.toString;
//Create an observable for background sounds.
var backgroundAudioSym = root.lookup("background_audio");
var backgroundAudioPausedSym = root.lookup("background_audio_paused");
if (backgroundAudioPausedSym.value() === undefined && backgroundAudioPausedSym.definition === undefined) {
backgroundAudioPausedSym.assign(false, root.scope, EdenSymbol.defaultAgent);
}
var backgroundAudio = new Audiovisual("background_audio", "Audio", true);
backgroundAudioSym.assign(backgroundAudio, root.scope,EdenSymbol.defaultAgent);
backgroundAudio.draw();
backgroundAudioSym.addJSObserver("initialize", function (sym, value) {
if (value instanceof Audiovisual) {
value.draw();
}
});
}}$;