+void
+Performer_group_performer::announce_element (Audio_element_info info)
+{
+ announce_infos_.push (info);
+ Translator_group *t
+ = context ()->get_parent_context ()->implementation ();
+
+ if (Performer_group_performer *eg = dynamic_cast<Performer_group_performer *> (t))
+ eg->announce_element (info);
+}
+
+void
+Performer_group_performer::acknowledge_audio_elements ()
+{
+ for (int j = 0; j < announce_infos_.size (); j++)
+ {
+ Audio_element_info info = announce_infos_[j];
+
+ for (SCM p = get_simple_trans_list (); scm_is_pair (p); p = scm_cdr (p))
+ {
+ Translator *t = unsmob_translator (scm_car (p));
+ Performer *eng = dynamic_cast<Performer *> (t);
+ if (eng && eng != info.origin_trans_)
+ eng->acknowledge_audio_element (info);
+ }
+ }
+}
+
+void
+performer_each (SCM list, Performer_method method)
+{
+ for (SCM p = list; scm_is_pair (p); p = scm_cdr (p))
+ {
+ Performer *e = dynamic_cast<Performer *> (unsmob_translator (scm_car (p)));
+ if (e)
+ (e->*method) ();
+ }
+}
+
+void
+Performer_group_performer::do_announces ()
+{
+ while (1)
+ {
+ performer_each (get_simple_trans_list (),
+ &Performer::create_audio_elements);
+
+ if (!announce_infos_.size ())
+ break;
+
+ acknowledge_audio_elements ();
+ announce_infos_.clear ();
+ }
+}
+
+void
+Performer_group_performer::play_element (Audio_element *e)
+{
+ Context *c = context_->get_parent_context ();
+ if (c)
+ {
+ Performer_group_performer *pgp = dynamic_cast<Performer_group_performer *> (c->implementation ());
+ pgp->play_element (e);
+ }
+}
+
+int
+Performer_group_performer::get_tempo () const
+{
+ Context *c = context_->get_parent_context ();
+ if (c)
+ {
+ Performer_group_performer *pgp = dynamic_cast<Performer_group_performer *> (c->implementation ());
+ return pgp->get_tempo ();
+ }
+ return 60;
+}