f->open = amp_open;
f->close = amp_close;
f->pre_select = generic_filter_pre_select;
f->post_select = amp_post_select;
f->parse_config = amp_parse_config;
f->free_config = amp_free_config;
f->open = amp_open;
f->close = amp_close;
f->pre_select = generic_filter_pre_select;
f->post_select = amp_post_select;
f->parse_config = amp_parse_config;
f->free_config = amp_free_config;