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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Classes for handling embedded media (mainly audio and video).
*
* These are used only from within the core media renderer.
*
* To embed media from Moodle code, do something like the following:
*
* $mediarenderer = $PAGE->get_renderer('core', 'media');
* echo $mediarenderer->embed_url(new moodle_url('http://example.org/a.mp3'));
*
* You do not need to require this library file manually. Getting the renderer
* (the first line above) requires this library file automatically.
*
* @package core_media
* @copyright 2012 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
if (!defined('CORE_MEDIA_VIDEO_WIDTH')) {
// Default video width if no width is specified; some players may do something
// more intelligent such as use real video width.
// May be defined in config.php if required.
define('CORE_MEDIA_VIDEO_WIDTH', 400);
}
if (!defined('CORE_MEDIA_VIDEO_HEIGHT')) {
// Default video height. May be defined in config.php if required.
define('CORE_MEDIA_VIDEO_HEIGHT', 300);
}
if (!defined('CORE_MEDIA_AUDIO_WIDTH')) {
// Default audio width if no width is specified.
// May be defined in config.php if required.
define('CORE_MEDIA_AUDIO_WIDTH', 300);
}
/**
* Constants and static utility functions for use with core_media_renderer.
*
* @copyright 2011 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
abstract class core_media {
/**
* Option: Disable text link fallback.
*
* Use this option if you are going to print a visible link anyway so it is
* pointless to have one as fallback.
*
* To enable, set value to true.
*/
const OPTION_NO_LINK = 'nolink';
/**
* Option: When embedding, if there is no matching embed, do not use the
* default link fallback player; instead return blank.
*
* This is different from OPTION_NO_LINK because this option still uses the
* fallback link if there is some kind of embedding. Use this option if you
* are going to check if the return value is blank and handle it specially.
*
* To enable, set value to true.
*/
const OPTION_FALLBACK_TO_BLANK = 'embedorblank';
/**
* Option: Enable players which are only suitable for use when we trust the
* user who embedded the content.
*
* At present, this option enables the SWF player.
*
* To enable, set value to true.
*/
const OPTION_TRUSTED = 'trusted';
/**
* Option: Put a div around the output (if not blank) so that it displays
* as a block using the 'resourcecontent' CSS class.
*
* To enable, set value to true.
*/
const OPTION_BLOCK = 'block';
/**
* Given a string containing multiple URLs separated by #, this will split
* it into an array of moodle_url objects suitable for using when calling
* embed_alternatives.
*
* Note that the input string should NOT be html-escaped (i.e. if it comes
* from html, call html_entity_decode first).
*
* @param string $combinedurl String of 1 or more alternatives separated by #
* @param int $width Output variable: width (will be set to 0 if not specified)
* @param int $height Output variable: height (0 if not specified)
* @return array Array of 1 or more moodle_url objects
*/
public static function split_alternatives($combinedurl, &$width, &$height) {
$urls = explode('#', $combinedurl);
$width = 0;
$height = 0;
$returnurls = array();
foreach ($urls as $url) {
$matches = null;
// You can specify the size as a separate part of the array like
// #d=640x480 without actually including a url in it.
if (preg_match('/^d=([\d]{1,4})x([\d]{1,4})$/i', $url, $matches)) {
$width = $matches[1];
$height = $matches[2];
continue;
}
// Can also include the ?d= as part of one of the URLs (if you use
// more than one they will be ignored except the last).
if (preg_match('/\?d=([\d]{1,4})x([\d]{1,4})$/i', $url, $matches)) {
$width = $matches[1];
$height = $matches[2];
// Trim from URL.
$url = str_replace($matches[0], '', $url);
}
// Clean up url.
$url = clean_param($url, PARAM_URL);
if (empty($url)) {
continue;
}
// Turn it into moodle_url object.
$returnurls[] = new moodle_url($url);
}
return $returnurls;
}
/**
* Returns the file extension for a URL.
* @param moodle_url $url URL
*/
public static function get_extension(moodle_url $url) {
// Note: Does not use textlib (. is UTF8-safe).
$filename = self::get_filename($url);
$dot = strrpos($filename, '.');
if ($dot === false) {
return '';
} else {
return strtolower(substr($filename, $dot + 1));
}
}
/**
* Obtains the filename from the moodle_url.
* @param moodle_url $url URL
* @return string Filename only (not escaped)
*/
public static function get_filename(moodle_url $url) {
global $CFG;
// Use the 'file' parameter if provided (for links created when
// slasharguments was off). If not present, just use URL path.
$path = $url->get_param('file');
if (!$path) {
$path = $url->get_path();
}
// Remove everything before last / if present. Does not use textlib as / is UTF8-safe.
$slash = strrpos($path, '/');
if ($slash !== false) {
$path = substr($path, $slash + 1);
}
return $path;
}
/**
* Guesses MIME type for a moodle_url based on file extension.
* @param moodle_url $url URL
* @return string MIME type
*/
public static function get_mimetype(moodle_url $url) {
return mimeinfo('type', self::get_filename($url));
}
}
/**
* Base class for media players.
*
* Media players return embed HTML for a particular way of playing back audio
* or video (or another file type).
*
* In order to make the code more lightweight, this is not a plugin type
* (players cannot have their own settings, database tables, capabilities, etc).
* These classes are used only by core_media_renderer in outputrenderers.php.
* If you add a new class here (in core code) you must modify the
* get_players_raw function in that file to include it.
*
* If a Moodle installation wishes to add extra player objects they can do so
* by overriding that renderer in theme, and overriding the get_players_raw
* function. The new player class should then of course be defined within the
* custom theme or other suitable location, not in this file.
*
* @copyright 2011 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
abstract class core_media_player {
/**
* Placeholder text used to indicate where the fallback content is placed
* within a result.
*/
const PLACEHOLDER = '<!--FALLBACK-->';
/**
* Generates code required to embed the player.
*
* The returned code contains a placeholder comment '<!--FALLBACK-->'
* (constant core_media_player::PLACEHOLDER) which indicates the location
* where fallback content should be placed in the event that this type of
* player is not supported by user browser.
*
* The $urls parameter includes one or more alternative media formats that
* are supported by this player. It does not include formats that aren't
* supported (see list_supported_urls).
*
* The $options array contains key-value pairs. See OPTION_xx constants
* for documentation of standard option(s).
*
* @param array $urls URLs of media files
* @param string $name Display name; '' to use default
* @param int $width Optional width; 0 to use default
* @param int $height Optional height; 0 to use default
* @param array $options Options array
* @return string HTML code for embed
*/
public abstract function embed($urls, $name, $width, $height, $options);
/**
* Gets the list of file extensions supported by this media player.
*
* Note: This is only required for the default implementation of
* list_supported_urls. If you override that function to determine
* supported URLs in some way other than by extension, then this function
* is not necessary.
*
* @return array Array of strings (extension not including dot e.g. 'mp3')
*/
public function get_supported_extensions() {
return array();
}
/**
* Lists keywords that must be included in a url that can be embedded with
* this player. Any such keywords should be added to the array.
*
* For example if this player supports FLV and F4V files then it should add
* '.flv' and '.f4v' to the array. (The check is not case-sensitive.)
*
* Default handling calls the get_supported_extensions function and adds
* a dot to each of those values, so players only need to override this
* if they don't implement get_supported_extensions.
*
* This is used to improve performance when matching links in the media filter.
*
* @return array Array of keywords to add to the embeddable markers list
*/
public function get_embeddable_markers() {
$markers = array();
foreach ($this->get_supported_extensions() as $extension) {
$markers[] = '.' . $extension;
}
return $markers;
}
/**
* Gets the ranking of this player. This is an integer used to decide which
* player to use (after applying other considerations such as which ones
* the user has disabled).
*
* Rank must be unique (no two players should have the same rank).
*
* Rank zero has a special meaning, indicating that this 'player' does not
* really embed the video.
*
* Rank is not a user-configurable value because it needs to be defined
* carefully in order to ensure that the embedding fallbacks actually work.
* It might be possible to have some user options which affect rank, but
* these would be best defined as e.g. checkboxes in settings that have
* a particular effect on the rank of a couple of plugins, rather than
* letting users generally alter rank.
*
* Note: Within medialib.php, players are listed in rank order (highest
* rank first).
*
* @return int Rank (higher is better)
*/
public abstract function get_rank();
/**
* @return bool True if player is enabled
*/
public function is_enabled() {
global $CFG;
// With the class core_media_player_html5video it is enabled
// based on $CFG->core_media_enable_html5video.
$setting = str_replace('_player_', '_enable_', get_class($this));
return !empty($CFG->{$setting});
}
/**
* Given a list of URLs, returns a reduced array containing only those URLs
* which are supported by this player. (Empty if none.)
* @param array $urls Array of moodle_url
* @param array $options Options (same as will be passed to embed)
* @return array Array of supported moodle_url
*/
public function list_supported_urls(array $urls, array $options = array()) {
$extensions = $this->get_supported_extensions();
$result = array();
foreach ($urls as $url) {
if (in_array(core_media::get_extension($url), $extensions)) {
$result[] = $url;
}
}
return $result;
}
/**
* Obtains suitable name for media. Uses specified name if there is one,
* otherwise makes one up.
* @param string $name User-specified name ('' if none)
* @param array $urls Array of moodle_url used to make up name
* @return string Name
*/
protected function get_name($name, $urls) {
// If there is a specified name, use that.
if ($name) {
return $name;
}
// Get filename of first URL.
$url = reset($urls);
$name = core_media::get_filename($url);
// If there is more than one url, strip the extension as we could be
// referring to a different one or several at once.
if (count($urls) > 1) {
$name = preg_replace('~\.[^.]*$~', '', $name);
}
return $name;
}
/**
* Compares by rank order, highest first. Used for sort functions.
* @param core_media_player $a Player A
* @param core_media_player $b Player B
* @return int Negative if A should go before B, positive for vice versa
*/
public static function compare_by_rank(core_media_player $a, core_media_player $b) {
return $b->get_rank() - $a->get_rank();
}
/**
* Utility function that sets width and height to defaults if not specified
* as a parameter to the function (will be specified either if, (a) the calling
* code passed it, or (b) the URL included it).
* @param int $width Width passed to function (updated with final value)
* @param int $height Height passed to function (updated with final value)
*/
protected static function pick_video_size(&$width, &$height) {
if (!$width) {
$width = CORE_MEDIA_VIDEO_WIDTH;
$height = CORE_MEDIA_VIDEO_HEIGHT;
}
}
}
/**
* Base class for players which handle external links (YouTube etc).
*
* As opposed to media files.
*
* @copyright 2011 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
abstract class core_media_player_external extends core_media_player {
/**
* Array of matches from regular expression - subclass can assume these
* will be valid when the embed function is called, to save it rerunning
* the regex.
* @var array
*/
protected $matches;
/**
* Part of a regular expression, including ending ~ symbol (note: these
* regexes use ~ instead of / because URLs and HTML code typically include
* / symbol and makes harder to read if you have to escape it).
* Matches the end part of a link after you have read the 'important' data
* including optional #d=400x300 at end of url, plus content of <a> tag,
* up to </a>.
* @var string
*/
const END_LINK_REGEX_PART = '[^#]*(#d=([\d]{1,4})x([\d]{1,4}))?~si';
public function embed($urls, $name, $width, $height, $options) {
return $this->embed_external(reset($urls), $name, $width, $height, $options);
}
/**
* Obtains HTML code to embed the link.
* @param moodle_url $url Single URL to embed
* @param string $name Display name; '' to use default
* @param int $width Optional width; 0 to use default
* @param int $height Optional height; 0 to use default
* @param array $options Options array
* @return string HTML code for embed
*/
protected abstract function embed_external(moodle_url $url, $name, $width, $height, $options);
public function list_supported_urls(array $urls, array $options = array()) {
// These only work with a SINGLE url (there is no fallback).
if (count($urls) != 1) {
return array();
}
$url = reset($urls);
// Check against regex.
if (preg_match($this->get_regex(), $url->out(false), $this->matches)) {
return array($url);
}
return array();
}
/**
* Returns regular expression used to match URLs that this player handles
* @return string PHP regular expression e.g. '~^https?://example.org/~'
*/
protected function get_regex() {
return '~^unsupported~';
}
/**
* Annoyingly, preg_match $matches result does not always have the same
* number of parameters - it leaves out optional ones at the end. WHAT.
* Anyway, this function can be used to fix it.
* @param array $matches Array that should be adjusted
* @param int $count Number of capturing groups (=6 to make $matches[6] work)
*/
protected static function fix_match_count(&$matches, $count) {
for ($i = count($matches); $i <= $count; $i++) {
$matches[$i] = false;
}
}
}
/**
* Player that embeds Vimeo links.
*
* @copyright 2011 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class core_media_player_vimeo extends core_media_player_external {
protected function embed_external(moodle_url $url, $name, $width, $height, $options) {
$videoid = $this->matches[1];
$info = s($name);
// Note: resizing via url is not supported, user can click the fullscreen
// button instead. iframe embedding is not xhtml strict but it is the only
// option that seems to work on most devices.
self::pick_video_size($width, $height);
$output = <<<OET
<span class="mediaplugin mediaplugin_vimeo">
<iframe title="$info" src="https://player.vimeo.com/video/$videoid"
width="$width" height="$height" frameborder="0"></iframe>
</span>
OET;
return $output;
}
protected function get_regex() {
// Initial part of link.
$start = '~^https?://vimeo\.com/';
// Middle bit: either watch?v= or v/.
$middle = '([0-9]+)';
return $start . $middle . core_media_player_external::END_LINK_REGEX_PART;
}
public function get_rank() {
return 1010;
}
public function get_embeddable_markers() {
return array('vimeo.com/');
}
}
/**
* Player that creates YouTube embedding.
*
* @copyright 2011 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class core_media_player_youtube extends core_media_player_external {
protected function embed_external(moodle_url $url, $name, $width, $height, $options) {
$site = $this->matches[1];
$videoid = $this->matches[3];
$info = trim($name);
if (empty($info) or strpos($info, 'http') === 0) {
$info = get_string('siteyoutube', 'core_media');
}
$info = s($info);
self::pick_video_size($width, $height);
return <<<OET
<span class="mediaplugin mediaplugin_youtube">
<iframe title="$info" width="$width" height="$height"
src="https://$site/embed/$videoid?rel=0&wmode=transparent" frameborder="0" allowfullscreen="1"></iframe>
</span>
OET;
}
protected function get_regex() {
// Initial part of link.
$start = '~^https?://(www\.youtube(-nocookie)?\.com)/';
// Middle bit: either watch?v= or v/.
$middle = '(?:watch\?v=|v/)([a-z0-9\-_]+)';
return $start . $middle . core_media_player_external::END_LINK_REGEX_PART;
}
public function get_rank() {
// I decided to make the link-embedding ones (that don't handle file
// formats) have ranking in the 1000 range.
return 1001;
}
public function get_embeddable_markers() {
return array('youtube');
}
}
/**
* Player that creates YouTube playlist embedding.
*
* @copyright 2011 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class core_media_player_youtube_playlist extends core_media_player_external {
public function is_enabled() {
global $CFG;
// Use the youtube on/off flag.
return $CFG->core_media_enable_youtube;
}
protected function embed_external(moodle_url $url, $name, $width, $height, $options) {
$site = $this->matches[1];
$playlist = $this->matches[3];
$info = trim($name);
if (empty($info) or strpos($info, 'http') === 0) {
$info = get_string('siteyoutube', 'core_media');
}
$info = s($info);
self::pick_video_size($width, $height);
return <<<OET
<span class="mediaplugin mediaplugin_youtube">
<iframe width="$width" height="$height" src="https://$site/embed/videoseries?list=$playlist" frameborder="0" allowfullscreen="1"></iframe>
</span>
OET;
}
protected function get_regex() {
// Initial part of link.
$start = '~^https?://(www\.youtube(-nocookie)?\.com)/';
// Middle bit: either view_play_list?p= or p/ (doesn't work on youtube) or playlist?list=.
$middle = '(?:view_play_list\?p=|p/|playlist\?list=)([a-z0-9\-_]+)';
return $start . $middle . core_media_player_external::END_LINK_REGEX_PART;
}
public function get_rank() {
// I decided to make the link-embedding ones (that don't handle file
// formats) have ranking in the 1000 range.
return 1000;
}
public function get_embeddable_markers() {
return array('youtube');
}
}
/**
* MP3 player inserted using JavaScript.
*
* @copyright 2011 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class core_media_player_mp3 extends core_media_player {
public function embed($urls, $name, $width, $height, $options) {
// Use first url (there can actually be only one unless some idiot
// enters two mp3 files as alternatives).
$url = reset($urls);
// Unique id even across different http requests made at the same time
// (for AJAX, iframes).
$id = 'core_media_mp3_' . md5(time() . '_' . rand());
// When Flash or JavaScript are not available only the fallback is displayed,
// using span not div because players are inline elements.
$spanparams = array('id' => $id, 'class' => 'mediaplugin mediaplugin_mp3');
if ($width) {
$spanparams['style'] = 'width: ' . $width . 'px';
}
$output = html_writer::tag('span', core_media_player::PLACEHOLDER, $spanparams);
// We can not use standard JS init because this may be cached
// note: use 'small' size unless embedding in block mode.
$output .= html_writer::script(js_writer::function_call(
'M.util.add_audio_player', array($id, $url->out(false),
empty($options[core_media::OPTION_BLOCK]))));
return $output;
}
public function get_supported_extensions() {
return array('mp3');
}
public function get_rank() {
return 80;
}
}
/**
* Flash video player inserted using JavaScript.
*
* @copyright 2011 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class core_media_player_flv extends core_media_player {
public function embed($urls, $name, $width, $height, $options) {
// Use first url (there can actually be only one unless some idiot
// enters two mp3 files as alternatives).
$url = reset($urls);
// Unique id even across different http requests made at the same time
// (for AJAX, iframes).
$id = 'core_media_flv_' . md5(time() . '_' . rand());
// Compute width and height.
$autosize = false;
if (!$width && !$height) {
$width = CORE_MEDIA_VIDEO_WIDTH;
$height = CORE_MEDIA_VIDEO_HEIGHT;
$autosize = true;
}
// Fallback span (will normally contain link).
$output = html_writer::tag('span', core_media_player::PLACEHOLDER,
array('id'=>$id, 'class'=>'mediaplugin mediaplugin_flv'));
// We can not use standard JS init because this may be cached.
$output .= html_writer::script(js_writer::function_call(
'M.util.add_video_player', array($id, addslashes_js($url->out(false)),
$width, $height, $autosize)));
return $output;
}
public function get_supported_extensions() {
return array('flv', 'f4v');
}
public function get_rank() {
return 70;
}
}
/**
* Embeds Windows Media Player using object tag.
*
* @copyright 2011 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class core_media_player_wmp extends core_media_player {
public function embed($urls, $name, $width, $height, $options) {
// Get URL (we just use first, probably there is only one).
$firsturl = reset($urls);
$url = $firsturl->out(false);
// Work out width.
if (!$width || !$height) {
// Object tag has default size.
$mpsize = '';
$size = 'width="' . CORE_MEDIA_VIDEO_WIDTH .
'" height="' . (CORE_MEDIA_VIDEO_HEIGHT+64) . '"';
$autosize = 'true';
} else {
$size = 'width="' . $width . '" height="' . ($height + 15) . '"';
$mpsize = 'width="' . $width . '" height="' . ($height + 64) . '"';
$autosize = 'false';
}
// MIME type for object tag.
$mimetype = core_media::get_mimetype($firsturl);
$fallback = core_media_player::PLACEHOLDER;
// Embed code.
return <<<OET
<span class="mediaplugin mediaplugin_wmp">
<object classid="CLSID:6BF52A52-394A-11d3-B153-00C04F79FAA6" $mpsize
standby="Loading Microsoft(R) Windows(R) Media Player components..."
type="application/x-oleobject">
<param name="Filename" value="$url" />
<param name="src" value="$url" />
<param name="url" value="$url" />
<param name="ShowControls" value="true" />
<param name="AutoRewind" value="true" />
<param name="AutoStart" value="false" />
<param name="Autosize" value="$autosize" />
<param name="EnableContextMenu" value="true" />
<param name="TransparentAtStart" value="false" />
<param name="AnimationAtStart" value="false" />
<param name="ShowGotoBar" value="false" />
<param name="EnableFullScreenControls" value="true" />
<param name="uimode" value="full" />
<!--[if !IE]>-->
<object data="$url" type="$mimetype" $size>
<param name="src" value="$url" />
<param name="controller" value="true" />
<param name="autoplay" value="false" />
<param name="autostart" value="false" />
<param name="resize" value="scale" />
<!--<![endif]-->
$fallback
<!--[if !IE]>-->
</object>
<!--<![endif]-->
</object>
</span>
OET;
}
public function get_supported_extensions() {
return array('wmv', 'avi');
}
public function get_rank() {
return 60;
}
}
/**
* Media player using object tag and QuickTime player.
*
* @copyright 2011 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class core_media_player_qt extends core_media_player {
public function embed($urls, $name, $width, $height, $options) {
// Show first URL.
$firsturl = reset($urls);
$url = $firsturl->out(true);
// Work out size.
if (!$width || !$height) {
$size = 'width="' . CORE_MEDIA_VIDEO_WIDTH .
'" height="' . (CORE_MEDIA_VIDEO_HEIGHT + 15) . '"';
} else {
$size = 'width="' . $width . '" height="' . ($height + 15) . '"';
}
// MIME type for object tag.
$mimetype = core_media::get_mimetype($firsturl);
$fallback = core_media_player::PLACEHOLDER;
// Embed code.
return <<<OET
<span class="mediaplugin mediaplugin_qt">
<object classid="clsid:02BF25D5-8C17-4B23-BC80-D3488ABDDC6B"
codebase="http://www.apple.com/qtactivex/qtplugin.cab" $size>
<param name="pluginspage" value="http://www.apple.com/quicktime/download/" />
<param name="src" value="$url" />
<param name="controller" value="true" />
<param name="loop" value="true" />
<param name="autoplay" value="false" />
<param name="autostart" value="false" />
<param name="scale" value="aspect" />
<!--[if !IE]>-->
<object data="$url" type="$mimetype" $size>
<param name="src" value="$url" />
<param name="pluginurl" value="http://www.apple.com/quicktime/download/" />
<param name="controller" value="true" />
<param name="loop" value="true" />
<param name="autoplay" value="false" />
<param name="autostart" value="false" />
<param name="scale" value="aspect" />
<!--<![endif]-->
$fallback
<!--[if !IE]>-->
</object>
<!--<![endif]-->
</object>
</span>
OET;
}
public function get_supported_extensions() {
return array('mpg', 'mpeg', 'mov', 'mp4', 'm4v', 'm4a');
}
public function get_rank() {
return 50;
}
}
/**
* Media player using object tag and RealPlayer.
*
* Hopefully nobody is using this obsolete format any more!
*
* @copyright 2011 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class core_media_player_rm extends core_media_player {
public function embed($urls, $name, $width, $height, $options) {
// Show first URL.
$firsturl = reset($urls);
$url = $firsturl->out(true);
// Get name to use as title.
$info = s($this->get_name($name, $urls));
// The previous version of this code has the following comment, which
// I don't understand, but trust it is correct:
// Note: the size is hardcoded intentionally because this does not work anyway!
$width = CORE_MEDIA_VIDEO_WIDTH;
$height = CORE_MEDIA_VIDEO_HEIGHT;
$fallback = core_media_player::PLACEHOLDER;
return <<<OET
<span class="mediaplugin mediaplugin_real">
<object title="$info" classid="clsid:CFCDAA03-8BE4-11cf-B84B-0020AFBBCCFA"
data="$url" width="$width" height="$height"">
<param name="src" value="$url" />
<param name="controls" value="All" />
<!--[if !IE]>-->
<object title="$info" type="audio/x-pn-realaudio-plugin"
data="$url" width="$width" height="$height">
<param name="src" value="$url" />
<param name="controls" value="All" />
<!--<![endif]-->
$fallback
<!--[if !IE]>-->
</object>
<!--<![endif]-->
</object>
</span>
OET;
}
public function get_supported_extensions() {
return array('ra', 'ram', 'rm', 'rv');
}
public function get_rank() {
return 40;
}
}
/**
* Media player for Flash SWF files.
*
* This player contains additional security restriction: it will only be used
* if you add option core_media_player_swf::ALLOW = true.
*
* Code should only set this option if it has verified that the data was
* embedded by a trusted user (e.g. in trust text).
*
* @copyright 2011 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class core_media_player_swf extends core_media_player {
public function embed($urls, $name, $width, $height, $options) {
self::pick_video_size($width, $height);
$firsturl = reset($urls);
$url = $firsturl->out(true);
$fallback = core_media_player::PLACEHOLDER;
$output = <<<OET
<span class="mediaplugin mediaplugin_swf">
<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" width="$width" height="$height">
<param name="movie" value="$url" />
<param name="autoplay" value="true" />
<param name="loop" value="true" />
<param name="controller" value="true" />
<param name="scale" value="aspect" />
<param name="base" value="." />
<param name="allowscriptaccess" value="never" />
<!--[if !IE]>-->
<object type="application/x-shockwave-flash" data="$url" width="$width" height="$height">
<param name="controller" value="true" />
<param name="autoplay" value="true" />
<param name="loop" value="true" />
<param name="scale" value="aspect" />
<param name="base" value="." />
<param name="allowscriptaccess" value="never" />
<!--<![endif]-->
$fallback
<!--[if !IE]>-->
</object>
<!--<![endif]-->
</object>
</span>
OET;
return $output;
}
public function get_supported_extensions() {
return array('swf');
}
public function list_supported_urls(array $urls, array $options = array()) {
// Not supported unless the creator is trusted.
if (empty($options[core_media::OPTION_TRUSTED])) {
return array();
}
return parent::list_supported_urls($urls, $options);
}
public function get_rank() {
return 30;
}
}
/**
* Player that creates HTML5 <video> tag.
*
* @copyright 2011 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class core_media_player_html5video extends core_media_player {
public function embed($urls, $name, $width, $height, $options) {
// Special handling to make videos play on Android devices pre 2.3.
// Note: I tested and 2.3.3 (in emulator) works without, is 533.1 webkit.
$oldandroid = check_browser_version('WebKit Android') &&
!check_browser_version('WebKit Android', '533.1');
// Build array of source tags.
$sources = array();
foreach ($urls as $url) {
$mimetype = core_media::get_mimetype($url);
$source = html_writer::tag('source', '', array('src' => $url, 'type' => $mimetype));
if ($mimetype === 'video/mp4') {
if ($oldandroid) {
// Old Android fails if you specify the type param.
$source = html_writer::tag('source', '', array('src' => $url));
}
// Better add m4v as first source, it might be a bit more
// compatible with problematic browsers.
array_unshift($sources, $source);
} else {
$sources[] = $source;
}
}
$sources = implode("\n", $sources);
$title = s($this->get_name($name, $urls));
if (!$width) {
// No width specified, use system default.
$width = CORE_MEDIA_VIDEO_WIDTH;
}
if (!$height) {
// Let browser choose height automatically.
$size = "width=\"$width\"";
} else {
$size = "width=\"$width\" height=\"$height\"";
}
$sillyscript = '';
$idtag = '';
if ($oldandroid) {
// Old Android does not support 'controls' option.
$id = 'core_media_html5v_' . md5(time() . '_' . rand());
$idtag = 'id="' . $id . '"';
$sillyscript = <<<OET
<script type="text/javascript">
document.getElementById('$id').addEventListener('click', function() {
this.play();
}, false);
</script>
OET;
}
$fallback = core_media_player::PLACEHOLDER;
return <<<OET
<span class="mediaplugin mediaplugin_html5video">
<video $idtag controls="true" $size preload="metadata" title="$title">
$sources
$fallback
</video>
$sillyscript
</span>
OET;
}
public function get_supported_extensions() {
return array('m4v', 'webm', 'ogv', 'mp4');
}
public function list_supported_urls(array $urls, array $options = array()) {
$extensions = $this->get_supported_extensions();
$result = array();
foreach ($urls as $url) {
$ext = core_media::get_extension($url);
if (in_array($ext, $extensions)) {
// Unfortunately html5 video does not handle fallback properly.
// https://www.w3.org/Bugs/Public/show_bug.cgi?id=10975
// That means we need to do browser detect and not use html5 on
// browsers which do not support the given type, otherwise users
// will not even see the fallback link.
// Based on http://en.wikipedia.org/wiki/HTML5_video#Table - this
// is a simplified version, does not take into account old browser
// versions or manual plugins.
if ($ext === 'ogv' || $ext === 'webm') {
// Formats .ogv and .webm are not supported in IE or Safari.
if (check_browser_version('MSIE') || check_browser_version('Safari')) {
continue;
}
} else {
// Formats .m4v and .mp4 are not supported in Firefox or Opera.
if (check_browser_version('Firefox') || check_browser_version('Opera')) {
continue;
}
}
$result[] = $url;
}
}
return $result;
}
public function get_rank() {
return 20;
}
}
/**
* Player that creates HTML5 <audio> tag.
*
* @copyright 2011 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class core_media_player_html5audio extends core_media_player {
public function embed($urls, $name, $width, $height, $options) {
// Build array of source tags.
$sources = array();
foreach ($urls as $url) {
$mimetype = core_media::get_mimetype($url);
$sources[] = html_writer::tag('source', '', array('src' => $url, 'type' => $mimetype));
}
$sources = implode("\n", $sources);
$title = s($this->get_name($name, $urls));
// Default to not specify size (so it can be changed in css).
$size = '';
if ($width) {
$size = 'width="' . $width . '"';
}
$fallback = core_media_player::PLACEHOLDER;
return <<<OET
<audio controls="true" $size class="mediaplugin mediaplugin_html5audio" preload="no" title="$title">
$sources
$fallback
</audio>
OET;
}
public function get_supported_extensions() {
return array('ogg', 'oga', 'aac', 'm4a', 'mp3');
}
public function list_supported_urls(array $urls, array $options = array()) {
$extensions = $this->get_supported_extensions();
$result = array();
foreach ($urls as $url) {
$ext = core_media::get_extension($url);
if (in_array($ext, $extensions)) {
if ($ext === 'ogg' || $ext === 'oga') {
// Formats .ogg and .oga are not supported in IE or Safari.
if (check_browser_version('MSIE') || check_browser_version('Safari')) {
continue;
}
} else {
// Formats .aac, .mp3, and .m4a are not supported in Firefox or Opera.
if (check_browser_version('Firefox') || check_browser_version('Opera')) {
continue;
}
}
// Old Android versions (pre 2.3.3) 'support' audio tag but no codecs.
if (check_browser_version('WebKit Android') &&
!check_browser_version('WebKit Android', '533.1')) {
continue;
}
$result[] = $url;
}
}
return $result;
}
public function get_rank() {
return 10;
}
}
/**
* Special media player class that just puts a link.
*
* Always enabled, used as the last fallback.
*
* @copyright 2011 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class core_media_player_link extends core_media_player {
public function embed($urls, $name, $width, $height, $options) {
// If link is turned off, return empty.
if (!empty($options[core_media::OPTION_NO_LINK])) {
return '';
}
// Build up link content.
$output = '';
foreach ($urls as $url) {
$title = core_media::get_filename($url);
$printlink = html_writer::link($url, $title, array('class' => 'mediafallbacklink'));
if ($output) {
// Where there are multiple available formats, there are fallback links
// for all formats, separated by /.
$output .= ' / ';
}
$output .= $printlink;
}
return $output;
}
public function list_supported_urls(array $urls, array $options = array()) {
// Supports all URLs.
return $urls;
}
public function is_enabled() {
// Cannot be disabled.
return true;
}
public function get_rank() {
return 0;
}
}
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