Customize album gallery template to display album description

functions.php

<?php

// Fetch album description
function custom_rtmedia_get_album_desc(){
    global $rtmedia_backbone;
    if ( $rtmedia_backbone[ 'backbone' ] ){
    echo '<%= album_desc %>';
    } else {
    return rtmedia_get_album_desc_custom();
    }
}

// Filter to display album description in album gallery
function rtm_filter_display_album_desc(){
    ?>
    <div>
        <h4><?php echo custom_rtmedia_get_album_desc(); ?></h4>
    </div>
    <?php
}
add_action( 'rtmedia_after_album_gallery_item', 'rtm_filter_display_album_desc' );

// rtMedia uses Backbone to handle load more / pagination. You also need to filter the JSON response which is handled by Backbone.
function rtmedia_backbone_template_filter_album_desc( $media ){
    if( $media->media_type == 'album' ){
        $albumdesc = get_post( rtmedia_media_id() );
        if( isset($albumdesc) ){
            $media->album_desc = $albumdesc->post_content;
        }        
    }
    return $media;
}
add_filter( 'rtmedia_media_array_backbone', 'rtmedia_backbone_template_filter_album_desc' );

// Custom function to view album description
function rtmedia_get_album_desc_custom(){    
    $album_desc = get_post( rtmedia_media_id() );
    if( isset($album_desc) ){        
        $desc = $album_desc->post_content;
    }else{
        $desc='';
    }
    return $desc;
}
?>