add mediaelement player to wordpress excerpt

gistfile1.php

add_filter( 'the_excerpt', 'add_audio_to_excerpt');
function add_audio_to_excerpt($excerpt){
	$content=get_the_content();
	$audiopos=strpos($content,'[audio src=');
	if(audiopos!=='') {
		$audio=substr($content,$audiopos,strpos($content,']')+1);
		return do_shortcode($audio.$excerpt);
	}
	else return $excerpt;
}