BuddyPress Album author template tags

functions.php

<?php
function bp_album_get_author_userdata() {
        global $pictures_template;
        $author_userdata = get_userdata($pictures_template->picture->owner_id);
        return $author_userdata;
}

function bp_album_get_the_author() {
        $author_userdata = bp_album_get_author_userdata();
        return $author_userdata->display_name;
}
?>