Simple Video Embed WP Plugin

<?php
/*
Plugin Name: Simple Video Embed
Plugin URI:
Description: Insert an HTML5 video with simple controls and Flash fallback using a single shortcode.
Version: 1.0
Author: Marian Cerny
Author URI: http://mariancerny.com
License: GPL2
*/



class mc_simple_video_embed
{


// *******************************************************************
// ------------------------------------------------------------------
//                  INITIALIZATION
// ------------------------------------------------------------------
// *******************************************************************

    var $settings = array(
        'autoplay' => true,
        'start_muted' => true,
        'video_directory' => '/video/',
        'width' => 320,
        'height' => 240
    );
    var $video_dir_path;
    var $video_dir_url;

    /* CONSTRUCTOR */
    public function __construct()
    {
        $this->get_settings();

        /* GET PATH AND URL TO DEFAULT VIDEO FOLDER */
        $s_upload_dir = wp_upload_dir();
        $this->video_dir_url = $s_upload_dir['baseurl'] . $this->settings['video_directory'];
        $this->video_dir_path = $s_upload_dir['basedir'] . $this->settings['video_directory'];

        /* DEFINE CONSTANTS */
        define( 'PLUGIN_NAME', 'Simple Video Embed' );
        define( 'PLUGIN_SLUG', 'simple-video-embed' );
        define( 'PLUGIN_URL', plugins_url( '', __FILE__ ) );
        define( 'ASSETS_URL', plugins_url( '', __FILE__ ) . '/assets/' );

        /* CREATE THE VIDEO DIRECTORY */
        if ( !file_exists( $this->video_dir_path ) )
            mkdir( $this->video_dir_path );

        /* ADD ACTIONS */
        add_action( 'admin_init', array( $this, 'mc_register_settings') );
        add_action('wp_enqueue_scripts', array($this, 'mc_enqueue_scripts_and_styles' ));
        add_shortcode('sve', array($this, 'mc_shortcode'));
        add_filter('widget_text', 'do_shortcode');
    }

    /* ENQUEUE SCRIPTS */
    function mc_enqueue_scripts_and_styles()
    {
        wp_enqueue_script( 'jquery' );
        wp_enqueue_script( 'player_controller', ASSETS_URL . 'player-controller.js' );

        wp_enqueue_style( 'main', ASSETS_URL . 'styles.css' );
    }


    /* ASSIGN SETTINGS FROM PLUGIN OPTIONS TO SETTINGS VARIABLE */
    function get_settings()
    {
        foreach ( $this->settings as $key => $value )
        {
            $option = get_option( 'sve_options_' . $key );
            if ( !empty( $option ) )
                $this->settings[$key] = $value;
        }
    }


// *******************************************************************
// ------------------------------------------------------------------
//                  CREATING THE OPTIONS MENU
// ------------------------------------------------------------------
// *******************************************************************
    /* CREATE AN ENTRY IN THE SETTINGS MENU AND REGISTER SETTINGS */
    function mc_register_settings()
    {
        add_options_page(
            PLUGIN_NAME,
            PLUGIN_NAME,
            'manage_options',
            PLUGIN_SLUG,
            array( $this, 'mc_output_options_page' )
        );

        // CREATE 'GENERAL OPTIONS' SECTION
        add_settings_section(
            'sve_general_options',
            'General settings',
            array( $this, 'mc_output_settings_section_general' ),
            PLUGIN_SLUG
        );

        // ADD 'WIDTH' SETTING
        add_settings_field(
            'sve_options_width',
            'Video width in px (default is 320)',
            array($this, 'mc_output_option_width'),
            PLUGIN_SLUG,
            'sve_general_options'
        );

        // ADD 'HEIGHT' SETTING
        add_settings_field(
            'sve_options_height',
            'Video height in px (default is 240',
            array($this, 'mc_output_option_height'),
            PLUGIN_SLUG,
            'sve_general_options'
        );

        // ADD 'AUTOPLAY' SETTING
        add_settings_field(
            'sve_options_autoplay',
            'Automatically play videos on page load',
            array($this, 'mc_output_option_autoplay'),
            PLUGIN_SLUG,
            'sve_general_options'
        );

        // ADD 'START MUTED' SETTING
        add_settings_field(
            'sve_options_start_muted',
            'Start videos muted',
            array($this, 'mc_output_option_start_muted'),
            PLUGIN_SLUG,
            'sve_general_options'
        );

        // ADD 'VIDEO DIRECTORY' SETTING
        add_settings_field(
            'sve_options_video_directory',
            'Video directory relative to \'/wp-content/uploads\' (default is \'/video\'',
            array($this, 'mc_output_option_video_directory'),
            PLUGIN_SLUG,
            'sve_general_options'
        );

        register_setting('mc_sve_options', 'sve_options_height');
        register_setting('mc_sve_options', 'sve_options_width');
        register_setting('mc_sve_options', 'sve_options_autoplay');
        register_setting('mc_sve_options', 'sve_options_start_muted');
        register_setting('mc_sve_options', 'sve_options_video_directory');
    }


    /* OUTPUT SETTINGS SECTION */
    function mc_output_settings_section_general()
    {
        echo 'These values are used only if they are not explicitly defined in the shortcode';
    }


    /* OUTPUT WIDTH SETTING FIELD */
    function mc_output_option_default_width()
    {
        echo '<input name="sve_options_width" id="sve_options_width" type="text" value='.get_option('sve_options_width'). ' />';
    }


    /* OUTPUT HEIGHT SETTING FIELD */
    function mc_output_option_default_height()
    {
        echo '<input name="sve_options_height" id="sve_options_height" type="text" value='.get_option('sve_options_height'). ' />';
    }


    /* OUTPUT AUTOPLAY SETTINGS FIELD */
    function mc_output_option_autoplay()
    {
        echo '<input name="sve_options_autoplay" id="sve_options_autoplay" type="checkbox" value="1" class="code" ' . checked( 1, get_option('sve_options_autoplay'), false ) . ' /> Enabled';
    }


    /* OUTPUT START MUTED SETTING FIELD */
    function mc_output_option_start_muted()
    {
        echo '<input name="sve_options_start_muted" id="sve_options_start_muted" type="checkbox" value="1" class="code" ' . checked( 1, get_option('sve_options_start_muted'), false ) . ' /> Enabled';
    }


    /* OUTPUT DEFAULT DIRECTORY SETTING FIELD */
    function mc_output_option_video_directory()
    {
        echo '<input name="sve_options_video_directory" id="sve_options_video_directory" type="text" value='.get_option('sve_options_video_directory'). ' />';
    }


    /* OUTPUT OPTIONS PAGE */
    function mc_output_options_page()
    {
        ?>
        <div class="wrap">
        <h2><?php echo PLUGIN_NAME; ?> Settings</h2>

        <form method="post" action="options.php">

            <?php settings_fields( 'mc_sve_general_options' ); ?>
            <?php do_settings_sections( 'mc_sve_general_options' ); ?>
            <?php submit_button(); ?>

        </form>
        </div>
        <?php
    }

// *******************************************************************
// ------------------------------------------------------------------
//                  MAIN FUNCTIONS
// ------------------------------------------------------------------
// *******************************************************************


    /* EXECUTE SHORTCODE */
    public function mc_shortcode( $atts )
    {
        // EXTRACT ATTRIBUTES FROM SHORTCODE
        extract( shortcode_atts( array(
            'filename' => 'video',
            'width' => $this->settings['width'],
            'height' => $this->settings['height'],
            'autoplay' => $this->settings['autoplay'],
            'start_muted' => $this->settings['start_muted'],
            'video_directory' => $this->settings['video_directory'],
        ), $atts));

        /* CREATE OUTPUT VARIABLE AND ASSIGN THE VALUE IN THE OUTPUT FILE */
        $s_output = '';
        include('assets/output-video.php');
        return $s_output;
    }


    /* CHECK IF GIVEN FILE WITH THE GIVEN EXTENSION EXISTS AND RETURN THE DESIRED TAG/ATTRIBUTE  */
    function mc_output_file_tag( $s_type, $s_filename, $s_extension )
    {
        // BUILD POSSIBLE FILENAME
        $s_possible_filename = $s_filename;
        $s_possible_filename .= ($s_type == 'poster') ? '_poster' : '';
        $s_possible_filename .= '.' . $s_extension;

        if ( file_exists( $this->video_dir_path . $s_possible_filename ) )
        {
            $s_file_url =  $this->video_dir_url . $s_possible_filename;

            switch ( $s_type )
            {
                case 'poster' :
                    return "poster='{$s_file_url}' ";
                case 'video' :
                    return "<source src='{$s_file_url}' />";
                case 'flash' :
                    return "file={$s_file_url}";
            }
        }

        return false;
    }



}

$mc_simple_video_embed = new mc_simple_video_embed();





?>