Proyectos de Subversion Moodle

<?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/>.

/**

 * Main class for plugin 'media_html5audio'

 *

 * @package   media_html5audio

 * @copyright 2016 Marina Glancy

 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

defined('MOODLE_INTERNAL') || die();

/**

 * Player that creates HTML5 <audio> tag.

 *

 * @package   media_html5audio

 * @copyright 2016 Marina Glancy

 * @author    2011 The Open University

 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

class media_html5audio_plugin extends core_media_player_native {

    public function embed($urls, $name, $width, $height, $options) {

        if (array_key_exists(core_media_manager::OPTION_ORIGINAL_TEXT, $options) &&

            preg_match('/^<(video|audio)\b/i', $options[core_media_manager::OPTION_ORIGINAL_TEXT], $matches)) {

            // We already had media tag, do nothing here.

            return $options[core_media_manager::OPTION_ORIGINAL_TEXT];

        }

        // Build array of source tags.

        $sources = array();

        foreach ($urls as $url) {

            $params = ['src' => $url];

            $ext = core_media_manager::instance()->get_extension($url);

            if ($ext !== 'aac') {

                // Some browsers get confused by mimetype on source for AAC files.

                $mimetype = core_media_manager::instance()->get_mimetype($url);

                $params['type'] = $mimetype;

            }

            $sources[] = html_writer::empty_tag('source', $params);

        }

        $sources = implode("\n", $sources);

        $title = $this->get_name($name, $urls);

        // Escape title but prevent double escaping.

        $title = s(preg_replace(['/&amp;/', '/&gt;/', '/&lt;/'], ['&', '>', '<'], $title));

        // Default to not specify size (so it can be changed in css).

        $size = '';

        if ($width) {

            $size = 'width="' . $width . '"';

        }

        // We don't want fallback to another player because list_supported_urls() is already smart.

        // Otherwise we could end up with nested <audio> tags. Fallback to link only.

        $fallback = self::LINKPLACEHOLDER;

        return <<<OET

<audio controls="true" $size class="mediaplugin mediaplugin_html5audio" preload="none" title="$title">

$sources

$fallback

</audio>

OET;

    }

    public function get_supported_extensions() {

        global $CFG;

        require_once($CFG->libdir . '/filelib.php');

        return file_get_typegroup('extension', 'html_audio');

    }

    public function list_supported_urls(array $urls, array $options = array()) {

        $extensions = $this->get_supported_extensions();

        $result = array();

        foreach ($urls as $url) {

            $ext = core_media_manager::instance()->get_extension($url);

            if (in_array('.' . $ext, $extensions) && core_useragent::supports_html5($ext)) {

                // 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.

                $result[] = $url;

            }

        }

        return $result;

    }

    /**

     * Default rank

     * @return int

     */

    public function get_rank() {

        return 20;

    }

}