2 This file is part of LilyPond, the GNU music typesetter.
4 Copyright (C) 1997--2015 Jan Nieuwenhuizen <janneke@gnu.org>
6 LilyPond is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 LilyPond is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
20 #include "audio-item.hh"
21 #include "music-sequence.hh"
22 #include "performer.hh"
23 #include "stream-event.hh"
25 #include "lily-imports.hh"
27 #include "translator.icc"
29 class Key_performer : public Performer
32 TRANSLATOR_DECLARATIONS (Key_performer);
36 void process_music ();
37 void stop_translation_timestep ();
39 void listen_key_change (Stream_event *);
41 Stream_event *key_ev_;
45 Key_performer::Key_performer (Context *c)
52 Key_performer::~Key_performer ()
57 Key_performer::process_music ()
61 SCM pitchlist = key_ev_->get_property ("pitch-alist");
63 SCM acc = Lily::alterations_in_key (pitchlist);
66 scm_to_int (scm_caar (pitchlist)),
67 ly_scm2rational (scm_cdar (pitchlist)));
72 = ly_transpose_key_alist (pitchlist,
73 pitch_interval (key_do, c_do).smobbed_copy ());
75 /* MIDI keys are too limited for lilypond scales.
76 We check for minor scale and assume major otherwise. */
78 SCM third = scm_assoc (scm_from_int (2),
80 bool minor = (scm_is_pair (third)
81 && scm_is_number (scm_cdr (third))
82 && ly_scm2rational (scm_cdr (third)) == FLAT_ALTERATION);
84 audio_ = new Audio_key (scm_to_int (acc),
87 Audio_element_info info (audio_, key_ev_);
88 announce_element (info);
94 Key_performer::stop_translation_timestep ()
103 Key_performer::listen_key_change (Stream_event *ev)
110 Key_performer::boot ()
112 ADD_LISTENER (Key_performer, key_change);
115 ADD_TRANSLATOR (Key_performer,