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PHP Cross Reference of moodle-2.8 |
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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 35 defined('MOODLE_INTERNAL') || die(); 36 37 if (!defined('CORE_MEDIA_VIDEO_WIDTH')) { 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. 41 define('CORE_MEDIA_VIDEO_WIDTH', 400); 42 } 43 if (!defined('CORE_MEDIA_VIDEO_HEIGHT')) { 44 // Default video height. May be defined in config.php if required. 45 define('CORE_MEDIA_VIDEO_HEIGHT', 300); 46 } 47 if (!defined('CORE_MEDIA_AUDIO_WIDTH')) { 48 // Default audio width if no width is specified. 49 // May be defined in config.php if required. 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 */ 60 abstract 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) { 159 // Note: Does not use core_text (. is UTF8-safe). 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) { 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 } 183 184 // 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 } 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 */ 223 abstract 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 */ 405 abstract 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 */ 484 class 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 $output = <<<OET 495 <span class="mediaplugin mediaplugin_vimeo"> 496 <iframe title="$info" src="https://player.vimeo.com/video/$videoid" 497 width="$width" height="$height" frameborder="0"></iframe> 498 </span> 499 OET; 500 501 return $output; 502 } 503 504 protected function get_regex() { 505 // Initial part of link. 506 $start = '~^https?://vimeo\.com/'; 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 */ 527 class core_media_player_youtube extends core_media_player_external { 528 protected function embed_external(moodle_url $url, $name, $width, $height, $options) { 529 $videoid = end($this->matches); 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, $height); 538 539 return <<<OET 540 <span class="mediaplugin mediaplugin_youtube"> 541 <iframe title="$info" width="$width" height="$height" 542 src="https://www.youtube.com/embed/$videoid?rel=0&wmode=transparent" frameborder="0" allowfullscreen="1"></iframe> 543 </span> 544 OET; 545 546 } 547 548 protected function get_regex() { 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/)'; 553 554 // Initial part of link. 555 $start = '~^https?://(www\.)?(' . $link . '|' . $shortlink . ')'; 556 // Middle bit: Video key value 557 $middle = '([a-z0-9\-_]+)'; 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() { 568 return array('youtube.com', 'youtube-nocookie.com', 'youtu.be', 'y2u.be'); 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 */ 579 class 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, $height); 597 598 return <<<OET 599 <span class="mediaplugin mediaplugin_youtube"> 600 <iframe width="$width" height="$height" src="https://$site/embed/videoseries?list=$playlist" frameborder="0" allowfullscreen="1"></iframe> 601 </span> 602 OET; 603 } 604 605 protected function get_regex() { 606 // Initial part of link. 607 $start = '~^https?://(www\.youtube(-nocookie)?\.com)/'; 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 . $middle . core_media_player_external::END_LINK_REGEX_PART; 611 } 612 613 public function get_rank() { 614 // I decided to make the link-embedding ones (that don't handle file 615 // formats) have ranking in the 1000 range. 616 return 1000; 617 } 618 619 public function get_embeddable_markers() { 620 return array('youtube'); 621 } 622 } 623 624 625 /** 626 * MP3 player inserted using JavaScript. 627 * 628 * @copyright 2011 The Open University 629 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later 630 */ 631 class core_media_player_mp3 extends core_media_player { 632 public function embed($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 $output; 655 } 656 657 public function get_supported_extensions() { 658 return array('mp3'); 659 } 660 661 public function get_rank() { 662 return 80; 663 } 664 } 665 666 667 /** 668 * Flash video player inserted using JavaScript. 669 * 670 * @copyright 2011 The Open University 671 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later 672 */ 673 class core_media_player_flv extends core_media_player { 674 public function embed($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 $output; 699 } 700 701 public function get_supported_extensions() { 702 return array('flv', 'f4v'); 703 } 704 705 public function get_rank() { 706 return 70; 707 } 708 } 709 710 711 /** 712 * Embeds Windows Media Player using object tag. 713 * 714 * @copyright 2011 The Open University 715 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later 716 */ 717 class core_media_player_wmp extends core_media_player { 718 public function embed($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 $fallback 769 <!--[if !IE]>--> 770 </object> 771 <!--<![endif]--> 772 </object> 773 </span> 774 OET; 775 } 776 777 public function get_supported_extensions() { 778 return array('wmv', 'avi'); 779 } 780 781 public function get_rank() { 782 return 60; 783 } 784 } 785 786 787 /** 788 * Media player using object tag and QuickTime player. 789 * 790 * @copyright 2011 The Open University 791 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later 792 */ 793 class core_media_player_qt extends core_media_player { 794 public function embed($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" /> 820 <param name="loop" value="false" /> 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" /> 829 <param name="loop" value="false" /> 830 <param name="autoplay" value="false" /> 831 <param name="autostart" value="false" /> 832 <param name="scale" value="aspect" /> 833 <!--<![endif]--> 834 $fallback 835 <!--[if !IE]>--> 836 </object> 837 <!--<![endif]--> 838 </object> 839 </span> 840 OET; 841 } 842 843 public function get_supported_extensions() { 844 return array('mpg', 'mpeg', 'mov', 'mp4', 'm4v', 'm4a'); 845 } 846 847 public function get_rank() { 848 return 50; 849 } 850 } 851 852 853 /** 854 * Media player using object tag and RealPlayer. 855 * 856 * Hopefully nobody is using this obsolete format any more! 857 * 858 * @copyright 2011 The Open University 859 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later 860 */ 861 class core_media_player_rm extends core_media_player { 862 public function embed($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 $fallback 890 <!--[if !IE]>--> 891 </object> 892 <!--<![endif]--> 893 </object> 894 </span> 895 OET; 896 } 897 898 public function get_supported_extensions() { 899 return array('ra', 'ram', 'rm', 'rv'); 900 } 901 902 public function get_rank() { 903 return 40; 904 } 905 } 906 907 908 /** 909 * Media player for Flash SWF files. 910 * 911 * This player contains additional security restriction: it will only be used 912 * if you add option core_media_player_swf::ALLOW = true. 913 * 914 * Code should only set this option if it has verified that the data was 915 * embedded by a trusted user (e.g. in trust text). 916 * 917 * @copyright 2011 The Open University 918 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later 919 */ 920 class core_media_player_swf extends core_media_player { 921 public function embed($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" /> 933 <param name="loop" value="false" /> 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" /> 942 <param name="loop" value="false" /> 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> 953 OET; 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, $options); 968 } 969 970 public function get_rank() { 971 return 30; 972 } 973 } 974 975 976 /** 977 * Player that creates HTML5 <video> tag. 978 * 979 * @copyright 2011 The Open University 980 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later 981 */ 982 class core_media_player_html5video extends core_media_player { 983 public function embed($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. 986 $oldandroid = core_useragent::is_webkit_android() && 987 !core_useragent::check_webkit_android_version('533.1'); 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 $sillyscript = <<<OET 1030 <script type="text/javascript"> 1031 document.getElementById('$id').addEventListener('click', function() { 1032 this.play(); 1033 }, false); 1034 </script> 1035 OET; 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> 1047 OET; 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. 1070 if (core_useragent::is_ie() || core_useragent::is_safari()) { 1071 continue; 1072 } 1073 } else { 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))) { 1079 continue; 1080 } 1081 } 1082 1083 $result[] = $url; 1084 } 1085 } 1086 return $result; 1087 } 1088 1089 public function get_rank() { 1090 return 20; 1091 } 1092 } 1093 1094 1095 /** 1096 * Player that creates HTML5 <audio> tag. 1097 * 1098 * @copyright 2011 The Open University 1099 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later 1100 */ 1101 class core_media_player_html5audio extends core_media_player { 1102 public function embed($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> 1127 OET; 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' || $ext === 'oga') { 1141 // Formats .ogg and .oga are not supported in IE or Safari. 1142 if (core_useragent::is_ie() || core_useragent::is_safari()) { 1143 continue; 1144 } 1145 } else { 1146 // Formats .aac, .mp3, and .m4a are not supported in Opera. 1147 if (core_useragent::is_opera()) { 1148 continue; 1149 } 1150 // Formats .mp3 and .m4a were not reliably supported in Firefox before 27. 1151 // https://developer.mozilla.org/en-US/docs/Web/HTML/Supported_media_formats 1152 // has the details. .aac is still not supported. 1153 if (core_useragent::is_firefox() && ($ext === 'aac' || 1154 !core_useragent::check_firefox_version(27))) { 1155 continue; 1156 } 1157 } 1158 // Old Android versions (pre 2.3.3) 'support' audio tag but no codecs. 1159 if (core_useragent::is_webkit_android() && 1160 !core_useragent::is_webkit_android('533.1')) { 1161 continue; 1162 } 1163 1164 $result[] = $url; 1165 } 1166 } 1167 return $result; 1168 } 1169 1170 public function get_rank() { 1171 return 10; 1172 } 1173 } 1174 1175 1176 /** 1177 * Special media player class that just puts a link. 1178 * 1179 * Always enabled, used as the last fallback. 1180 * 1181 * @copyright 2011 The Open University 1182 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later 1183 */ 1184 class core_media_player_link extends core_media_player { 1185 public function embed($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 }
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