source file of the GNU LilyPond music typesetter
- (c) 1997--1998 Jan Nieuwenhuizen <janneke@gnu.org>
+ (c) 1997--2009 Jan Nieuwenhuizen <janneke@gnu.org>
*/
-#include "key-performer.hh"
-#include "command-request.hh"
#include "audio-item.hh"
+#include "music-sequence.hh"
+#include "performer.hh"
+#include "stream-event.hh"
+#include "warn.hh"
+#include "translator.icc"
+class Key_performer : public Performer
+{
+public:
+ TRANSLATOR_DECLARATIONS (Key_performer);
+ ~Key_performer ();
-IMPLEMENT_IS_TYPE_B1(Key_performer,Performer);
-ADD_THIS_TRANSLATOR(Key_performer);
+protected:
+ void process_music ();
+ void stop_translation_timestep ();
-Key_performer::Key_performer()
-{
- key_req_l_ = 0;
-}
+ DECLARE_TRANSLATOR_LISTENER (key_change);
+private:
+ Stream_event *key_ev_;
+ Audio_key *audio_;
+};
-Key_performer::~Key_performer()
+Key_performer::Key_performer ()
{
+ key_ev_ = 0;
+ audio_ = 0;
}
-void
-Key_performer::do_print() const
+Key_performer::~Key_performer ()
{
-#ifndef NPRINT
- if (key_req_l_)
- key_req_l_->print();
-#endif
}
void
-Key_performer::do_process_requests()
+Key_performer::process_music ()
{
- if (key_req_l_)
- play (new Audio_key (key_req_l_));
- key_req_l_ = 0;
+ if (key_ev_)
+ {
+ SCM pitchlist = key_ev_->get_property ("pitch-alist");
+ SCM proc = ly_lily_module_constant ("alterations-in-key");
+
+ SCM acc = scm_call_1 (proc, pitchlist);
+
+ Pitch key_do (0,
+ scm_to_int (scm_caar (pitchlist)),
+ ly_scm2rational (scm_cdar (pitchlist)));
+
+ Pitch c_do (0, 0, 0);
+
+ SCM c_pitchlist
+ = ly_transpose_key_alist (pitchlist,
+ pitch_interval (key_do, c_do).smobbed_copy ());
+
+ /* MIDI keys are too limited for lilypond scales.
+ We check for minor scale and assume major otherwise. */
+
+ SCM third = scm_assoc (scm_from_int (2),
+ c_pitchlist);
+ bool minor = (scm_is_pair (third)
+ && scm_is_number (scm_cdr (third))
+ && ly_scm2rational (scm_cdr (third)) == FLAT_ALTERATION);
+
+ audio_ = new Audio_key (scm_to_int (acc),
+ !minor);
+
+ Audio_element_info info (audio_, key_ev_);
+ announce_element (info);
+ key_ev_ = 0;
+ }
}
-bool
-Key_performer::do_try_request (Request* req_l)
+void
+Key_performer::stop_translation_timestep ()
{
- if (Key_change_req *kc = dynamic_cast <Key_change_req *> (req_l))
+ if (audio_)
{
- if (key_req_l_)
- warning ("FIXME. Key change merge");
-
- key_req_l_ = kc;
- return true;
+ audio_ = 0;
}
+}
- return false;
+IMPLEMENT_TRANSLATOR_LISTENER (Key_performer, key_change);
+void
+Key_performer::listen_key_change (Stream_event *ev)
+{
+ if (!key_ev_)
+ key_ev_ = ev;
}
+ADD_TRANSLATOR (Key_performer,
+ /* doc */
+ "",
+
+ /* create */
+ "",
+
+ /* read */
+ "",
+
+ /* write */
+ ""
+ );