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_html5video'

 *

 * @package   media_html5video

 * @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 <video> tag.

 *

 * @package   media_html5video

 * @copyright 2016 Marina Glancy

 * @author 2011 The Open University

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

 */

class media_html5video_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];

        }

        // 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 = core_useragent::is_webkit_android() &&

            !core_useragent::check_webkit_android_version('533.1');

        // Build array of source tags.

        $sources = array();

        foreach ($urls as $url) {

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

            if ($mimetype === 'video/quicktime' && (core_useragent::is_chrome() || core_useragent::is_edge())) {

                // Set mimetype of quicktime videos to mp4 for Chrome/Edge browsers.

                $mimetype = 'video/mp4';

            }

            $source = html_writer::empty_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::empty_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 = $this->get_name($name, $urls);

        // Escape title but prevent double escaping.

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

        self::pick_video_size($width, $height);

        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;

        }

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

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

        $fallback = self::LINKPLACEHOLDER;

        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() {

        global $CFG;

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

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

    }

    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;

    }

    /**

     * 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) {

        global $CFG;

        if (!$width) {

            $width = $CFG->media_default_width;

        }

    }

    /**

     * Default rank

     * @return int

     */

    public function get_rank() {

        return 50;

    }

}