MDL-49059 medialib: Add tests for Youtube videos within playlists
[moodle.git] / lib / medialib.php
CommitLineData
daefd6eb 1<?php
2// This file is part of Moodle - http://moodle.org/
3//
4// Moodle is free software: you can redistribute it and/or modify
5// it under the terms of the GNU General Public License as published by
6// the Free Software Foundation, either version 3 of the License, or
7// (at your option) any later version.
8//
9// Moodle is distributed in the hope that it will be useful,
10// but WITHOUT ANY WARRANTY; without even the implied warranty of
11// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12// GNU General Public License for more details.
13//
14// You should have received a copy of the GNU General Public License
15// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
16
17/**
18 * Classes for handling embedded media (mainly audio and video).
19 *
20 * These are used only from within the core media renderer.
21 *
22 * To embed media from Moodle code, do something like the following:
23 *
24 * $mediarenderer = $PAGE->get_renderer('core', 'media');
25 * echo $mediarenderer->embed_url(new moodle_url('http://example.org/a.mp3'));
26 *
27 * You do not need to require this library file manually. Getting the renderer
28 * (the first line above) requires this library file automatically.
29 *
30 * @package core_media
31 * @copyright 2012 The Open University
32 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
33 */
34
35defined('MOODLE_INTERNAL') || die();
36
37if (!defined('CORE_MEDIA_VIDEO_WIDTH')) {
83c9d449
AB
38 // Default video width if no width is specified; some players may do something
39 // more intelligent such as use real video width.
40 // May be defined in config.php if required.
daefd6eb 41 define('CORE_MEDIA_VIDEO_WIDTH', 400);
42}
43if (!defined('CORE_MEDIA_VIDEO_HEIGHT')) {
83c9d449 44 // Default video height. May be defined in config.php if required.
daefd6eb 45 define('CORE_MEDIA_VIDEO_HEIGHT', 300);
46}
47if (!defined('CORE_MEDIA_AUDIO_WIDTH')) {
83c9d449
AB
48 // Default audio width if no width is specified.
49 // May be defined in config.php if required.
daefd6eb 50 define('CORE_MEDIA_AUDIO_WIDTH', 300);
51}
52
53
54/**
55 * Constants and static utility functions for use with core_media_renderer.
56 *
57 * @copyright 2011 The Open University
58 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
59 */
60abstract class core_media {
61 /**
62 * Option: Disable text link fallback.
63 *
64 * Use this option if you are going to print a visible link anyway so it is
65 * pointless to have one as fallback.
66 *
67 * To enable, set value to true.
68 */
69 const OPTION_NO_LINK = 'nolink';
70
71 /**
72 * Option: When embedding, if there is no matching embed, do not use the
73 * default link fallback player; instead return blank.
74 *
75 * This is different from OPTION_NO_LINK because this option still uses the
76 * fallback link if there is some kind of embedding. Use this option if you
77 * are going to check if the return value is blank and handle it specially.
78 *
79 * To enable, set value to true.
80 */
81 const OPTION_FALLBACK_TO_BLANK = 'embedorblank';
82
83 /**
84 * Option: Enable players which are only suitable for use when we trust the
85 * user who embedded the content.
86 *
87 * At present, this option enables the SWF player.
88 *
89 * To enable, set value to true.
90 */
91 const OPTION_TRUSTED = 'trusted';
92
93 /**
94 * Option: Put a div around the output (if not blank) so that it displays
95 * as a block using the 'resourcecontent' CSS class.
96 *
97 * To enable, set value to true.
98 */
99 const OPTION_BLOCK = 'block';
100
101 /**
102 * Given a string containing multiple URLs separated by #, this will split
103 * it into an array of moodle_url objects suitable for using when calling
104 * embed_alternatives.
105 *
106 * Note that the input string should NOT be html-escaped (i.e. if it comes
107 * from html, call html_entity_decode first).
108 *
109 * @param string $combinedurl String of 1 or more alternatives separated by #
110 * @param int $width Output variable: width (will be set to 0 if not specified)
111 * @param int $height Output variable: height (0 if not specified)
112 * @return array Array of 1 or more moodle_url objects
113 */
114 public static function split_alternatives($combinedurl, &$width, &$height) {
115 $urls = explode('#', $combinedurl);
116 $width = 0;
117 $height = 0;
118 $returnurls = array();
119
120 foreach ($urls as $url) {
121 $matches = null;
122
123 // You can specify the size as a separate part of the array like
124 // #d=640x480 without actually including a url in it.
125 if (preg_match('/^d=([\d]{1,4})x([\d]{1,4})$/i', $url, $matches)) {
126 $width = $matches[1];
127 $height = $matches[2];
128 continue;
129 }
130
131 // Can also include the ?d= as part of one of the URLs (if you use
132 // more than one they will be ignored except the last).
133 if (preg_match('/\?d=([\d]{1,4})x([\d]{1,4})$/i', $url, $matches)) {
134 $width = $matches[1];
135 $height = $matches[2];
136
137 // Trim from URL.
138 $url = str_replace($matches[0], '', $url);
139 }
140
141 // Clean up url.
142 $url = clean_param($url, PARAM_URL);
143 if (empty($url)) {
144 continue;
145 }
146
147 // Turn it into moodle_url object.
148 $returnurls[] = new moodle_url($url);
149 }
150
151 return $returnurls;
152 }
153
154 /**
155 * Returns the file extension for a URL.
156 * @param moodle_url $url URL
157 */
158 public static function get_extension(moodle_url $url) {
2f1e464a 159 // Note: Does not use core_text (. is UTF8-safe).
daefd6eb 160 $filename = self::get_filename($url);
161 $dot = strrpos($filename, '.');
162 if ($dot === false) {
163 return '';
164 } else {
165 return strtolower(substr($filename, $dot + 1));
166 }
167 }
168
169 /**
170 * Obtains the filename from the moodle_url.
171 * @param moodle_url $url URL
172 * @return string Filename only (not escaped)
173 */
174 public static function get_filename(moodle_url $url) {
a3c17aed 175 global $CFG;
176
177 // Use the 'file' parameter if provided (for links created when
178 // slasharguments was off). If not present, just use URL path.
179 $path = $url->get_param('file');
180 if (!$path) {
181 $path = $url->get_path();
182 }
183
daefd6eb 184 // Remove everything before last / if present. Does not use textlib as / is UTF8-safe.
185 $slash = strrpos($path, '/');
186 if ($slash !== false) {
187 $path = substr($path, $slash + 1);
188 }
daefd6eb 189 return $path;
190 }
191
192 /**
193 * Guesses MIME type for a moodle_url based on file extension.
194 * @param moodle_url $url URL
195 * @return string MIME type
196 */
197 public static function get_mimetype(moodle_url $url) {
198 return mimeinfo('type', self::get_filename($url));
199 }
200}
201
202
203/**
204 * Base class for media players.
205 *
206 * Media players return embed HTML for a particular way of playing back audio
207 * or video (or another file type).
208 *
209 * In order to make the code more lightweight, this is not a plugin type
210 * (players cannot have their own settings, database tables, capabilities, etc).
211 * These classes are used only by core_media_renderer in outputrenderers.php.
212 * If you add a new class here (in core code) you must modify the
213 * get_players_raw function in that file to include it.
214 *
215 * If a Moodle installation wishes to add extra player objects they can do so
216 * by overriding that renderer in theme, and overriding the get_players_raw
217 * function. The new player class should then of course be defined within the
218 * custom theme or other suitable location, not in this file.
219 *
220 * @copyright 2011 The Open University
221 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
222 */
223abstract class core_media_player {
224 /**
225 * Placeholder text used to indicate where the fallback content is placed
226 * within a result.
227 */
228 const PLACEHOLDER = '<!--FALLBACK-->';
229
230 /**
231 * Generates code required to embed the player.
232 *
233 * The returned code contains a placeholder comment '<!--FALLBACK-->'
234 * (constant core_media_player::PLACEHOLDER) which indicates the location
235 * where fallback content should be placed in the event that this type of
236 * player is not supported by user browser.
237 *
238 * The $urls parameter includes one or more alternative media formats that
239 * are supported by this player. It does not include formats that aren't
240 * supported (see list_supported_urls).
241 *
242 * The $options array contains key-value pairs. See OPTION_xx constants
243 * for documentation of standard option(s).
244 *
245 * @param array $urls URLs of media files
246 * @param string $name Display name; '' to use default
247 * @param int $width Optional width; 0 to use default
248 * @param int $height Optional height; 0 to use default
249 * @param array $options Options array
250 * @return string HTML code for embed
251 */
252 public abstract function embed($urls, $name, $width, $height, $options);
253
254 /**
255 * Gets the list of file extensions supported by this media player.
256 *
257 * Note: This is only required for the default implementation of
258 * list_supported_urls. If you override that function to determine
259 * supported URLs in some way other than by extension, then this function
260 * is not necessary.
261 *
262 * @return array Array of strings (extension not including dot e.g. 'mp3')
263 */
264 public function get_supported_extensions() {
265 return array();
266 }
267
268 /**
269 * Lists keywords that must be included in a url that can be embedded with
270 * this player. Any such keywords should be added to the array.
271 *
272 * For example if this player supports FLV and F4V files then it should add
273 * '.flv' and '.f4v' to the array. (The check is not case-sensitive.)
274 *
275 * Default handling calls the get_supported_extensions function and adds
276 * a dot to each of those values, so players only need to override this
277 * if they don't implement get_supported_extensions.
278 *
279 * This is used to improve performance when matching links in the media filter.
280 *
281 * @return array Array of keywords to add to the embeddable markers list
282 */
283 public function get_embeddable_markers() {
284 $markers = array();
285 foreach ($this->get_supported_extensions() as $extension) {
286 $markers[] = '.' . $extension;
287 }
288 return $markers;
289 }
290
291 /**
292 * Gets the ranking of this player. This is an integer used to decide which
293 * player to use (after applying other considerations such as which ones
294 * the user has disabled).
295 *
296 * Rank must be unique (no two players should have the same rank).
297 *
298 * Rank zero has a special meaning, indicating that this 'player' does not
299 * really embed the video.
300 *
301 * Rank is not a user-configurable value because it needs to be defined
302 * carefully in order to ensure that the embedding fallbacks actually work.
303 * It might be possible to have some user options which affect rank, but
304 * these would be best defined as e.g. checkboxes in settings that have
305 * a particular effect on the rank of a couple of plugins, rather than
306 * letting users generally alter rank.
307 *
308 * Note: Within medialib.php, players are listed in rank order (highest
309 * rank first).
310 *
311 * @return int Rank (higher is better)
312 */
313 public abstract function get_rank();
314
315 /**
316 * @return bool True if player is enabled
317 */
318 public function is_enabled() {
319 global $CFG;
320
321 // With the class core_media_player_html5video it is enabled
322 // based on $CFG->core_media_enable_html5video.
323 $setting = str_replace('_player_', '_enable_', get_class($this));
324 return !empty($CFG->{$setting});
325 }
326
327 /**
328 * Given a list of URLs, returns a reduced array containing only those URLs
329 * which are supported by this player. (Empty if none.)
330 * @param array $urls Array of moodle_url
331 * @param array $options Options (same as will be passed to embed)
332 * @return array Array of supported moodle_url
333 */
334 public function list_supported_urls(array $urls, array $options = array()) {
335 $extensions = $this->get_supported_extensions();
336 $result = array();
337 foreach ($urls as $url) {
338 if (in_array(core_media::get_extension($url), $extensions)) {
339 $result[] = $url;
340 }
341 }
342 return $result;
343 }
344
345 /**
346 * Obtains suitable name for media. Uses specified name if there is one,
347 * otherwise makes one up.
348 * @param string $name User-specified name ('' if none)
349 * @param array $urls Array of moodle_url used to make up name
350 * @return string Name
351 */
352 protected function get_name($name, $urls) {
353 // If there is a specified name, use that.
354 if ($name) {
355 return $name;
356 }
357
358 // Get filename of first URL.
359 $url = reset($urls);
360 $name = core_media::get_filename($url);
361
362 // If there is more than one url, strip the extension as we could be
363 // referring to a different one or several at once.
364 if (count($urls) > 1) {
365 $name = preg_replace('~\.[^.]*$~', '', $name);
366 }
367
368 return $name;
369 }
370
371 /**
372 * Compares by rank order, highest first. Used for sort functions.
373 * @param core_media_player $a Player A
374 * @param core_media_player $b Player B
375 * @return int Negative if A should go before B, positive for vice versa
376 */
377 public static function compare_by_rank(core_media_player $a, core_media_player $b) {
378 return $b->get_rank() - $a->get_rank();
379 }
380
381 /**
382 * Utility function that sets width and height to defaults if not specified
383 * as a parameter to the function (will be specified either if, (a) the calling
384 * code passed it, or (b) the URL included it).
385 * @param int $width Width passed to function (updated with final value)
386 * @param int $height Height passed to function (updated with final value)
387 */
388 protected static function pick_video_size(&$width, &$height) {
389 if (!$width) {
390 $width = CORE_MEDIA_VIDEO_WIDTH;
391 $height = CORE_MEDIA_VIDEO_HEIGHT;
392 }
393 }
394}
395
396
397/**
398 * Base class for players which handle external links (YouTube etc).
399 *
400 * As opposed to media files.
401 *
402 * @copyright 2011 The Open University
403 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
404 */
405abstract class core_media_player_external extends core_media_player {
406 /**
407 * Array of matches from regular expression - subclass can assume these
408 * will be valid when the embed function is called, to save it rerunning
409 * the regex.
410 * @var array
411 */
412 protected $matches;
413
414 /**
415 * Part of a regular expression, including ending ~ symbol (note: these
416 * regexes use ~ instead of / because URLs and HTML code typically include
417 * / symbol and makes harder to read if you have to escape it).
418 * Matches the end part of a link after you have read the 'important' data
419 * including optional #d=400x300 at end of url, plus content of <a> tag,
420 * up to </a>.
421 * @var string
422 */
423 const END_LINK_REGEX_PART = '[^#]*(#d=([\d]{1,4})x([\d]{1,4}))?~si';
424
425 public function embed($urls, $name, $width, $height, $options) {
426 return $this->embed_external(reset($urls), $name, $width, $height, $options);
427 }
428
429 /**
430 * Obtains HTML code to embed the link.
431 * @param moodle_url $url Single URL to embed
432 * @param string $name Display name; '' to use default
433 * @param int $width Optional width; 0 to use default
434 * @param int $height Optional height; 0 to use default
435 * @param array $options Options array
436 * @return string HTML code for embed
437 */
438 protected abstract function embed_external(moodle_url $url, $name, $width, $height, $options);
439
440 public function list_supported_urls(array $urls, array $options = array()) {
441 // These only work with a SINGLE url (there is no fallback).
442 if (count($urls) != 1) {
443 return array();
444 }
445 $url = reset($urls);
446
447 // Check against regex.
448 if (preg_match($this->get_regex(), $url->out(false), $this->matches)) {
449 return array($url);
450 }
451
452 return array();
453 }
454
455 /**
456 * Returns regular expression used to match URLs that this player handles
457 * @return string PHP regular expression e.g. '~^https?://example.org/~'
458 */
459 protected function get_regex() {
460 return '~^unsupported~';
461 }
462
463 /**
464 * Annoyingly, preg_match $matches result does not always have the same
465 * number of parameters - it leaves out optional ones at the end. WHAT.
466 * Anyway, this function can be used to fix it.
467 * @param array $matches Array that should be adjusted
468 * @param int $count Number of capturing groups (=6 to make $matches[6] work)
469 */
470 protected static function fix_match_count(&$matches, $count) {
471 for ($i = count($matches); $i <= $count; $i++) {
472 $matches[$i] = false;
473 }
474 }
475}
476
477
478/**
479 * Player that embeds Vimeo links.
480 *
481 * @copyright 2011 The Open University
482 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
483 */
484class core_media_player_vimeo extends core_media_player_external {
485 protected function embed_external(moodle_url $url, $name, $width, $height, $options) {
486 $videoid = $this->matches[1];
487 $info = s($name);
488
489 // Note: resizing via url is not supported, user can click the fullscreen
490 // button instead. iframe embedding is not xhtml strict but it is the only
491 // option that seems to work on most devices.
492 self::pick_video_size($width, $height);
493
494 $output = <<<OET
495<span class="mediaplugin mediaplugin_vimeo">
feddb588 496<iframe title="$info" src="https://player.vimeo.com/video/$videoid"
daefd6eb 497 width="$width" height="$height" frameborder="0"></iframe>
498</span>
499OET;
500
501 return $output;
502 }
503
504 protected function get_regex() {
505 // Initial part of link.
feddb588 506 $start = '~^https?://vimeo\.com/';
daefd6eb 507 // Middle bit: either watch?v= or v/.
508 $middle = '([0-9]+)';
509 return $start . $middle . core_media_player_external::END_LINK_REGEX_PART;
510 }
511
512 public function get_rank() {
513 return 1010;
514 }
515
516 public function get_embeddable_markers() {
517 return array('vimeo.com/');
518 }
519}
520
521/**
522 * Player that creates YouTube embedding.
523 *
524 * @copyright 2011 The Open University
525 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
526 */
527class core_media_player_youtube extends core_media_player_external {
528 protected function embed_external(moodle_url $url, $name, $width, $height, $options) {
1ba43a9c 529 $videoid = end($this->matches);
daefd6eb 530
531 $info = trim($name);
532 if (empty($info) or strpos($info, 'http') === 0) {
533 $info = get_string('siteyoutube', 'core_media');
534 }
535 $info = s($info);
536
537 self::pick_video_size($width, $height);
538
13725b37 539 return <<<OET
feddb588 540<span class="mediaplugin mediaplugin_youtube">
daefd6eb 541<iframe title="$info" width="$width" height="$height"
1ba43a9c 542 src="https://www.youtube.com/embed/$videoid?rel=0&wmode=transparent" frameborder="0" allowfullscreen="1"></iframe>
feddb588 543</span>
daefd6eb 544OET;
feddb588 545
daefd6eb 546 }
547
548 protected function get_regex() {
1ba43a9c
JPG
549 // Regex for standard youtube link
550 $link = '(youtube(-nocookie)?\.com/(?:watch\?v=|v/))';
551 // Regex for shortened youtube link
552 $shortlink = '((youtu|y2u)\.be/)';
553
daefd6eb 554 // Initial part of link.
1ba43a9c
JPG
555 $start = '~^https?://(www\.)?(' . $link . '|' . $shortlink . ')';
556 // Middle bit: Video key value
557 $middle = '([a-z0-9\-_]+)';
daefd6eb 558 return $start . $middle . core_media_player_external::END_LINK_REGEX_PART;
559 }
560
561 public function get_rank() {
562 // I decided to make the link-embedding ones (that don't handle file
563 // formats) have ranking in the 1000 range.
564 return 1001;
565 }
566
567 public function get_embeddable_markers() {
1ba43a9c 568 return array('youtube.com', 'youtube-nocookie.com', 'youtu.be', 'y2u.be');
daefd6eb 569 }
570}
571
572
573/**
574 * Player that creates YouTube playlist embedding.
575 *
576 * @copyright 2011 The Open University
577 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
578 */
579class core_media_player_youtube_playlist extends core_media_player_external {
580 public function is_enabled() {
581 global $CFG;
582 // Use the youtube on/off flag.
583 return $CFG->core_media_enable_youtube;
584 }
585
586 protected function embed_external(moodle_url $url, $name, $width, $height, $options) {
587 $site = $this->matches[1];
588 $playlist = $this->matches[3];
589
590 $info = trim($name);
591 if (empty($info) or strpos($info, 'http') === 0) {
592 $info = get_string('siteyoutube', 'core_media');
593 }
594 $info = s($info);
595
596 self::pick_video_size($width, $height);
597
feddb588 598 return <<<OET
daefd6eb 599<span class="mediaplugin mediaplugin_youtube">
feddb588 600<iframe width="$width" height="$height" src="https://$site/embed/videoseries?list=$playlist" frameborder="0" allowfullscreen="1"></iframe>
daefd6eb 601</span>
602OET;
daefd6eb 603 }
604
605 protected function get_regex() {
606 // Initial part of link.
feddb588 607 $start = '~^https?://(www\.youtube(-nocookie)?\.com)/';
daefd6eb 608 // Middle bit: either view_play_list?p= or p/ (doesn't work on youtube) or playlist?list=.
609 $middle = '(?:view_play_list\?p=|p/|playlist\?list=)([a-z0-9\-_]+)';
610 return $start . $middle . core_media_player_external::END_LINK_REGEX_PART;
611 }
612
613 public function get_rank() {
614 // I decided to make the link-embedding ones (that don't handle file
615 // formats) have ranking in the 1000 range.
616 return 1000;
617 }
618
619 public function get_embeddable_markers() {
620 return array('youtube');
621 }
622}
623
624
625/**
626 * MP3 player inserted using JavaScript.
627 *
628 * @copyright 2011 The Open University
629 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
630 */
631class core_media_player_mp3 extends core_media_player {
632 public function embed($urls, $name, $width, $height, $options) {
633 // Use first url (there can actually be only one unless some idiot
634 // enters two mp3 files as alternatives).
635 $url = reset($urls);
636
637 // Unique id even across different http requests made at the same time
638 // (for AJAX, iframes).
639 $id = 'core_media_mp3_' . md5(time() . '_' . rand());
640
641 // When Flash or JavaScript are not available only the fallback is displayed,
642 // using span not div because players are inline elements.
643 $spanparams = array('id' => $id, 'class' => 'mediaplugin mediaplugin_mp3');
644 if ($width) {
645 $spanparams['style'] = 'width: ' . $width . 'px';
646 }
647 $output = html_writer::tag('span', core_media_player::PLACEHOLDER, $spanparams);
648 // We can not use standard JS init because this may be cached
649 // note: use 'small' size unless embedding in block mode.
650 $output .= html_writer::script(js_writer::function_call(
651 'M.util.add_audio_player', array($id, $url->out(false),
652 empty($options[core_media::OPTION_BLOCK]))));
653
654 return $output;
655 }
656
657 public function get_supported_extensions() {
658 return array('mp3');
659 }
660
661 public function get_rank() {
662 return 80;
663 }
664}
665
666
667/**
668 * Flash video player inserted using JavaScript.
669 *
670 * @copyright 2011 The Open University
671 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
672 */
673class core_media_player_flv extends core_media_player {
674 public function embed($urls, $name, $width, $height, $options) {
675 // Use first url (there can actually be only one unless some idiot
676 // enters two mp3 files as alternatives).
677 $url = reset($urls);
678
679 // Unique id even across different http requests made at the same time
680 // (for AJAX, iframes).
681 $id = 'core_media_flv_' . md5(time() . '_' . rand());
682
683 // Compute width and height.
684 $autosize = false;
685 if (!$width && !$height) {
686 $width = CORE_MEDIA_VIDEO_WIDTH;
687 $height = CORE_MEDIA_VIDEO_HEIGHT;
688 $autosize = true;
689 }
690
691 // Fallback span (will normally contain link).
692 $output = html_writer::tag('span', core_media_player::PLACEHOLDER,
693 array('id'=>$id, 'class'=>'mediaplugin mediaplugin_flv'));
694 // We can not use standard JS init because this may be cached.
695 $output .= html_writer::script(js_writer::function_call(
696 'M.util.add_video_player', array($id, addslashes_js($url->out(false)),
697 $width, $height, $autosize)));
698 return $output;
699 }
700
701 public function get_supported_extensions() {
702 return array('flv', 'f4v');
703 }
704
705 public function get_rank() {
706 return 70;
707 }
708}
709
710
711/**
712 * Embeds Windows Media Player using object tag.
713 *
714 * @copyright 2011 The Open University
715 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
716 */
717class core_media_player_wmp extends core_media_player {
718 public function embed($urls, $name, $width, $height, $options) {
719 // Get URL (we just use first, probably there is only one).
720 $firsturl = reset($urls);
721 $url = $firsturl->out(false);
722
723 // Work out width.
724 if (!$width || !$height) {
725 // Object tag has default size.
726 $mpsize = '';
727 $size = 'width="' . CORE_MEDIA_VIDEO_WIDTH .
728 '" height="' . (CORE_MEDIA_VIDEO_HEIGHT+64) . '"';
729 $autosize = 'true';
730 } else {
731 $size = 'width="' . $width . '" height="' . ($height + 15) . '"';
732 $mpsize = 'width="' . $width . '" height="' . ($height + 64) . '"';
733 $autosize = 'false';
734 }
735
736 // MIME type for object tag.
737 $mimetype = core_media::get_mimetype($firsturl);
738
739 $fallback = core_media_player::PLACEHOLDER;
740
741 // Embed code.
742 return <<<OET
743<span class="mediaplugin mediaplugin_wmp">
744 <object classid="CLSID:6BF52A52-394A-11d3-B153-00C04F79FAA6" $mpsize
745 standby="Loading Microsoft(R) Windows(R) Media Player components..."
746 type="application/x-oleobject">
747 <param name="Filename" value="$url" />
748 <param name="src" value="$url" />
749 <param name="url" value="$url" />
750 <param name="ShowControls" value="true" />
751 <param name="AutoRewind" value="true" />
752 <param name="AutoStart" value="false" />
753 <param name="Autosize" value="$autosize" />
754 <param name="EnableContextMenu" value="true" />
755 <param name="TransparentAtStart" value="false" />
756 <param name="AnimationAtStart" value="false" />
757 <param name="ShowGotoBar" value="false" />
758 <param name="EnableFullScreenControls" value="true" />
759 <param name="uimode" value="full" />
760 <!--[if !IE]>-->
761 <object data="$url" type="$mimetype" $size>
762 <param name="src" value="$url" />
763 <param name="controller" value="true" />
764 <param name="autoplay" value="false" />
765 <param name="autostart" value="false" />
766 <param name="resize" value="scale" />
767 <!--<![endif]-->
768 $fallback
769 <!--[if !IE]>-->
770 </object>
771 <!--<![endif]-->
772 </object>
773</span>
774OET;
775 }
776
777 public function get_supported_extensions() {
778 return array('wmv', 'avi');
779 }
780
781 public function get_rank() {
782 return 60;
783 }
784}
785
786
787/**
788 * Media player using object tag and QuickTime player.
789 *
790 * @copyright 2011 The Open University
791 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
792 */
793class core_media_player_qt extends core_media_player {
794 public function embed($urls, $name, $width, $height, $options) {
795 // Show first URL.
796 $firsturl = reset($urls);
797 $url = $firsturl->out(true);
798
799 // Work out size.
800 if (!$width || !$height) {
801 $size = 'width="' . CORE_MEDIA_VIDEO_WIDTH .
802 '" height="' . (CORE_MEDIA_VIDEO_HEIGHT + 15) . '"';
803 } else {
804 $size = 'width="' . $width . '" height="' . ($height + 15) . '"';
805 }
806
807 // MIME type for object tag.
808 $mimetype = core_media::get_mimetype($firsturl);
809
810 $fallback = core_media_player::PLACEHOLDER;
811
812 // Embed code.
813 return <<<OET
814<span class="mediaplugin mediaplugin_qt">
815 <object classid="clsid:02BF25D5-8C17-4B23-BC80-D3488ABDDC6B"
816 codebase="http://www.apple.com/qtactivex/qtplugin.cab" $size>
817 <param name="pluginspage" value="http://www.apple.com/quicktime/download/" />
818 <param name="src" value="$url" />
819 <param name="controller" value="true" />
c476e678 820 <param name="loop" value="false" />
daefd6eb 821 <param name="autoplay" value="false" />
822 <param name="autostart" value="false" />
823 <param name="scale" value="aspect" />
824 <!--[if !IE]>-->
825 <object data="$url" type="$mimetype" $size>
826 <param name="src" value="$url" />
827 <param name="pluginurl" value="http://www.apple.com/quicktime/download/" />
828 <param name="controller" value="true" />
c476e678 829 <param name="loop" value="false" />
daefd6eb 830 <param name="autoplay" value="false" />
831 <param name="autostart" value="false" />
832 <param name="scale" value="aspect" />
833 <!--<![endif]-->
834 $fallback
835 <!--[if !IE]>-->
836 </object>
837 <!--<![endif]-->
838 </object>
839</span>
840OET;
841 }
842
843 public function get_supported_extensions() {
844 return array('mpg', 'mpeg', 'mov', 'mp4', 'm4v', 'm4a');
845 }
846
847 public function get_rank() {
848 return 50;
849 }
850}
851
852
853/**
854 * Media player using object tag and RealPlayer.
855 *
856 * Hopefully nobody is using this obsolete format any more!
857 *
858 * @copyright 2011 The Open University
859 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
860 */
861class core_media_player_rm extends core_media_player {
862 public function embed($urls, $name, $width, $height, $options) {
863 // Show first URL.
864 $firsturl = reset($urls);
865 $url = $firsturl->out(true);
866
867 // Get name to use as title.
868 $info = s($this->get_name($name, $urls));
869
870 // The previous version of this code has the following comment, which
871 // I don't understand, but trust it is correct:
872 // Note: the size is hardcoded intentionally because this does not work anyway!
873 $width = CORE_MEDIA_VIDEO_WIDTH;
874 $height = CORE_MEDIA_VIDEO_HEIGHT;
875
876 $fallback = core_media_player::PLACEHOLDER;
877 return <<<OET
878<span class="mediaplugin mediaplugin_real">
879 <object title="$info" classid="clsid:CFCDAA03-8BE4-11cf-B84B-0020AFBBCCFA"
880 data="$url" width="$width" height="$height"">
881 <param name="src" value="$url" />
882 <param name="controls" value="All" />
883 <!--[if !IE]>-->
884 <object title="$info" type="audio/x-pn-realaudio-plugin"
885 data="$url" width="$width" height="$height">
886 <param name="src" value="$url" />
887 <param name="controls" value="All" />
888 <!--<![endif]-->
889 $fallback
890 <!--[if !IE]>-->
891 </object>
892 <!--<![endif]-->
893 </object>
894</span>
895OET;
896 }
897
898 public function get_supported_extensions() {
899 return array('ra', 'ram', 'rm', 'rv');
900 }
901
902 public function get_rank() {
903 return 40;
904 }
905}
906
907
908/**
909 * Media player for Flash SWF files.
910 *
911 * This player contains additional security restriction: it will only be used
912 * if you add option core_media_player_swf::ALLOW = true.
913 *
914 * Code should only set this option if it has verified that the data was
915 * embedded by a trusted user (e.g. in trust text).
916 *
917 * @copyright 2011 The Open University
918 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
919 */
920class core_media_player_swf extends core_media_player {
921 public function embed($urls, $name, $width, $height, $options) {
922 self::pick_video_size($width, $height);
923
924 $firsturl = reset($urls);
925 $url = $firsturl->out(true);
926
927 $fallback = core_media_player::PLACEHOLDER;
928 $output = <<<OET
929<span class="mediaplugin mediaplugin_swf">
930 <object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" width="$width" height="$height">
931 <param name="movie" value="$url" />
932 <param name="autoplay" value="true" />
c476e678 933 <param name="loop" value="false" />
daefd6eb 934 <param name="controller" value="true" />
935 <param name="scale" value="aspect" />
936 <param name="base" value="." />
937 <param name="allowscriptaccess" value="never" />
938<!--[if !IE]>-->
939 <object type="application/x-shockwave-flash" data="$url" width="$width" height="$height">
940 <param name="controller" value="true" />
941 <param name="autoplay" value="true" />
c476e678 942 <param name="loop" value="false" />
daefd6eb 943 <param name="scale" value="aspect" />
944 <param name="base" value="." />
945 <param name="allowscriptaccess" value="never" />
946<!--<![endif]-->
947$fallback
948<!--[if !IE]>-->
949 </object>
950<!--<![endif]-->
951 </object>
952</span>
953OET;
954
955 return $output;
956 }
957
958 public function get_supported_extensions() {
959 return array('swf');
960 }
961
962 public function list_supported_urls(array $urls, array $options = array()) {
963 // Not supported unless the creator is trusted.
964 if (empty($options[core_media::OPTION_TRUSTED])) {
965 return array();
966 }
967 return parent::list_supported_urls($urls, $options);
968 }
969
970 public function get_rank() {
971 return 30;
972 }
973}
974
975
976/**
977 * Player that creates HTML5 <video> tag.
978 *
979 * @copyright 2011 The Open University
980 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
981 */
982class core_media_player_html5video extends core_media_player {
983 public function embed($urls, $name, $width, $height, $options) {
984 // Special handling to make videos play on Android devices pre 2.3.
985 // Note: I tested and 2.3.3 (in emulator) works without, is 533.1 webkit.
378b3eac 986 $oldandroid = core_useragent::is_webkit_android() &&
c3d2fbf9 987 !core_useragent::check_webkit_android_version('533.1');
daefd6eb 988
989 // Build array of source tags.
990 $sources = array();
991 foreach ($urls as $url) {
992 $mimetype = core_media::get_mimetype($url);
993 $source = html_writer::tag('source', '', array('src' => $url, 'type' => $mimetype));
994 if ($mimetype === 'video/mp4') {
995 if ($oldandroid) {
996 // Old Android fails if you specify the type param.
997 $source = html_writer::tag('source', '', array('src' => $url));
998 }
999
1000 // Better add m4v as first source, it might be a bit more
1001 // compatible with problematic browsers.
1002 array_unshift($sources, $source);
1003 } else {
1004 $sources[] = $source;
1005 }
1006 }
1007
1008 $sources = implode("\n", $sources);
1009 $title = s($this->get_name($name, $urls));
1010
1011 if (!$width) {
1012 // No width specified, use system default.
1013 $width = CORE_MEDIA_VIDEO_WIDTH;
1014 }
1015
1016 if (!$height) {
1017 // Let browser choose height automatically.
1018 $size = "width=\"$width\"";
1019 } else {
1020 $size = "width=\"$width\" height=\"$height\"";
1021 }
1022
1023 $sillyscript = '';
1024 $idtag = '';
1025 if ($oldandroid) {
1026 // Old Android does not support 'controls' option.
1027 $id = 'core_media_html5v_' . md5(time() . '_' . rand());
1028 $idtag = 'id="' . $id . '"';
1029 $sillyscript = <<<OET
1030<script type="text/javascript">
1031document.getElementById('$id').addEventListener('click', function() {
1032 this.play();
1033}, false);
1034</script>
1035OET;
1036 }
1037
1038 $fallback = core_media_player::PLACEHOLDER;
1039 return <<<OET
1040<span class="mediaplugin mediaplugin_html5video">
1041<video $idtag controls="true" $size preload="metadata" title="$title">
1042 $sources
1043 $fallback
1044</video>
1045$sillyscript
1046</span>
1047OET;
1048 }
1049
1050 public function get_supported_extensions() {
1051 return array('m4v', 'webm', 'ogv', 'mp4');
1052 }
1053
1054 public function list_supported_urls(array $urls, array $options = array()) {
1055 $extensions = $this->get_supported_extensions();
1056 $result = array();
1057 foreach ($urls as $url) {
1058 $ext = core_media::get_extension($url);
1059 if (in_array($ext, $extensions)) {
1060 // Unfortunately html5 video does not handle fallback properly.
1061 // https://www.w3.org/Bugs/Public/show_bug.cgi?id=10975
1062 // That means we need to do browser detect and not use html5 on
1063 // browsers which do not support the given type, otherwise users
1064 // will not even see the fallback link.
1065 // Based on http://en.wikipedia.org/wiki/HTML5_video#Table - this
1066 // is a simplified version, does not take into account old browser
1067 // versions or manual plugins.
1068 if ($ext === 'ogv' || $ext === 'webm') {
1069 // Formats .ogv and .webm are not supported in IE or Safari.
378b3eac 1070 if (core_useragent::is_ie() || core_useragent::is_safari()) {
daefd6eb 1071 continue;
1072 }
1073 } else {
540af6f3 1074 // Formats .m4v and .mp4 are not supported in Opera, or in Firefox before 27.
1075 // https://developer.mozilla.org/en-US/docs/Web/HTML/Supported_media_formats
1076 // has the details.
1077 if (core_useragent::is_opera() || (core_useragent::is_firefox() &&
1078 !core_useragent::check_firefox_version(27))) {
daefd6eb 1079 continue;
1080 }
1081 }
1082
1083 $result[] = $url;
1084 }
1085 }
1086 return $result;
1087 }
1088
1089 public function get_rank() {
1090 return 20;
1091 }
1092}
1093
1094
1095/**
1096 * Player that creates HTML5 <audio> tag.
1097 *
1098 * @copyright 2011 The Open University
1099 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
1100 */
1101class core_media_player_html5audio extends core_media_player {
1102 public function embed($urls, $name, $width, $height, $options) {
1103
1104 // Build array of source tags.
1105 $sources = array();
1106 foreach ($urls as $url) {
1107 $mimetype = core_media::get_mimetype($url);
1108 $sources[] = html_writer::tag('source', '', array('src' => $url, 'type' => $mimetype));
1109 }
1110
1111 $sources = implode("\n", $sources);
1112 $title = s($this->get_name($name, $urls));
1113
1114 // Default to not specify size (so it can be changed in css).
1115 $size = '';
1116 if ($width) {
1117 $size = 'width="' . $width . '"';
1118 }
1119
1120 $fallback = core_media_player::PLACEHOLDER;
1121
1122 return <<<OET
1123<audio controls="true" $size class="mediaplugin mediaplugin_html5audio" preload="no" title="$title">
1124$sources
1125$fallback
1126</audio>
1127OET;
1128 }
1129
1130 public function get_supported_extensions() {
1131 return array('ogg', 'oga', 'aac', 'm4a', 'mp3');
1132 }
1133
1134 public function list_supported_urls(array $urls, array $options = array()) {
1135 $extensions = $this->get_supported_extensions();
1136 $result = array();
1137 foreach ($urls as $url) {
1138 $ext = core_media::get_extension($url);
1139 if (in_array($ext, $extensions)) {
1140 if ($ext === 'ogg' || $ext === 'oga') {
1141 // Formats .ogg and .oga are not supported in IE or Safari.
378b3eac 1142 if (core_useragent::is_ie() || core_useragent::is_safari()) {
daefd6eb 1143 continue;
1144 }
1145 } else {
540af6f3 1146 // Formats .aac, .mp3, and .m4a are not supported in Opera.
1147 if (core_useragent::is_opera()) {
1148 continue;
1149 }
1150 // Formats .mp3 and .m4a were not reliably supported in Firefox before 27.
1151 // https://developer.mozilla.org/en-US/docs/Web/HTML/Supported_media_formats
1152 // has the details. .aac is still not supported.
1153 if (core_useragent::is_firefox() && ($ext === 'aac' ||
1154 !core_useragent::check_firefox_version(27))) {
daefd6eb 1155 continue;
1156 }
1157 }
1158 // Old Android versions (pre 2.3.3) 'support' audio tag but no codecs.
378b3eac
DP
1159 if (core_useragent::is_webkit_android() &&
1160 !core_useragent::is_webkit_android('533.1')) {
daefd6eb 1161 continue;
1162 }
1163
1164 $result[] = $url;
1165 }
1166 }
1167 return $result;
1168 }
1169
1170 public function get_rank() {
1171 return 10;
1172 }
1173}
1174
1175
1176/**
1177 * Special media player class that just puts a link.
1178 *
1179 * Always enabled, used as the last fallback.
1180 *
1181 * @copyright 2011 The Open University
1182 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
1183 */
1184class core_media_player_link extends core_media_player {
1185 public function embed($urls, $name, $width, $height, $options) {
1186 // If link is turned off, return empty.
1187 if (!empty($options[core_media::OPTION_NO_LINK])) {
1188 return '';
1189 }
1190
1191 // Build up link content.
1192 $output = '';
1193 foreach ($urls as $url) {
1194 $title = core_media::get_filename($url);
1195 $printlink = html_writer::link($url, $title, array('class' => 'mediafallbacklink'));
1196 if ($output) {
1197 // Where there are multiple available formats, there are fallback links
1198 // for all formats, separated by /.
1199 $output .= ' / ';
1200 }
1201 $output .= $printlink;
1202 }
1203 return $output;
1204 }
1205
1206 public function list_supported_urls(array $urls, array $options = array()) {
1207 // Supports all URLs.
1208 return $urls;
1209 }
1210
1211 public function is_enabled() {
1212 // Cannot be disabled.
1213 return true;
1214 }
1215
1216 public function get_rank() {
1217 return 0;
1218 }
1219}