How can I parse shortcodes in buddypress forum posts?

Hello,

I've installed the newest version of buddypress. Forums are activated.

I want to use shortcodes in forum posts [book title="the stranger"].

Unfortunately I cannot find a hook to parse the shortcode and replace it with html.

Within my plugin I tried both

add_filter('bbp_get_reply_content', 'my_parser', 10, 2);
add_filter('bbp_get_topic_content', 'myparser', 10, 2);

but it seems as if function my_parser is not called.

Can you help me?

Thank you very much for a short reply.

Regards

Helmut