Using custom queries in Revolution Slider

[justinlosh]

I have a rev slider that I want to use to display a custom post type of mine called vehicle. These vehicles have a meta field called “wpcm_featured” and its value can be either 0 for no or 1 for yes. I want my slider to display only featured vehicles and also to order them by price(wpcm_price) from low to high. The code I have now doesn’t seem to do any ordering or filtering except by post type.

function slider_hot_deals($query, $slider_id) {
    
    // only apply the special filter for slider with "x" ID
    // http://tinyurl.com/zb6hzpc
    if($slider_id == 4) {
        
        // order posts by vehicle price
        $query['meta_query'] = array(
            'price_clause' => 
                array(
                    'key' => 'wpcm_price',
                    'type' => 'numeric'
                ),
            'featured_clause' =>
                array(
                    'key' => 'wpcm_featured',
                    'type' => 'numeric',
                    'value' => '1'
                )
        );
        $query['orderby'] = 'price_clause';
        $query['order'] = 'ASC';
        
    }
    
    return $query;
    
}

add_filter('revslider_get_posts', 'slider_hot_deals', 10, 2);

What am I doing wrong?