source file of the GNU LilyPond music typesetter
- (c) 1997--2001 Jan Nieuwenhuizen <janneke@gnu.org>
+ (c) 1997--2009 Jan Nieuwenhuizen <janneke@gnu.org>
*/
-#include "lily-guile.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:
- VIRTUAL_COPY_CONS (Translator);
-
- Key_performer ();
+ TRANSLATOR_DECLARATIONS (Key_performer);
~Key_performer ();
protected:
- virtual bool try_music (Music* req_l);
- virtual void create_audio_elements ();
- virtual void stop_translation_timestep ();
+ void process_music ();
+ void stop_translation_timestep ();
+ DECLARE_TRANSLATOR_LISTENER (key_change);
private:
- Key_change_req* key_req_l_;
- Audio_key* audio_p_;
+ Stream_event *key_ev_;
+ Audio_key *audio_;
};
-ADD_THIS_TRANSLATOR (Key_performer);
-
Key_performer::Key_performer ()
{
- key_req_l_ = 0;
- audio_p_ = 0;
+ key_ev_ = 0;
+ audio_ = 0;
}
Key_performer::~Key_performer ()
}
void
-Key_performer::create_audio_elements ()
+Key_performer::process_music ()
{
- if (key_req_l_)
+ if (key_ev_)
{
- SCM pitchlist = key_req_l_->get_mus_property ("pitch-alist");
- SCM proc = scm_eval2 (ly_symbol2scm ("accidentals-in-key"), SCM_EOL);
- SCM acc = gh_call1 (proc, pitchlist);
- proc = scm_eval2 (ly_symbol2scm ("major-key"), SCM_EOL);
- SCM major = gh_call1 (proc, pitchlist);
- audio_p_ = new Audio_key (gh_scm2int (acc), major == SCM_BOOL_T);
- Audio_element_info info (audio_p_, key_req_l_);
+ 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_req_l_ = 0;
+ key_ev_ = 0;
}
}
void
Key_performer::stop_translation_timestep ()
{
- if (audio_p_)
+ if (audio_)
{
- play_element (audio_p_);
- audio_p_ = 0;
+ audio_ = 0;
}
}
-bool
-Key_performer::try_music (Music* req_l)
+IMPLEMENT_TRANSLATOR_LISTENER (Key_performer, key_change);
+void
+Key_performer::listen_key_change (Stream_event *ev)
{
- if (Key_change_req *kc = dynamic_cast <Key_change_req *> (req_l))
- {
- if (key_req_l_)
- warning (_ ("FIXME: key change merge"));
+ if (!key_ev_)
+ key_ev_ = ev;
+}
- key_req_l_ = kc;
- return true;
- }
+ADD_TRANSLATOR (Key_performer,
+ /* doc */
+ "",
- return false;
-}
+ /* create */
+ "",
+
+ /* read */
+ "",
+ /* write */
+ ""
+ );