/*
- key-performer.cc -- implement Key_performer
+ This file is part of LilyPond, the GNU music typesetter.
- source file of the GNU LilyPond music typesetter
+ Copyright (C) 1997--2015 Jan Nieuwenhuizen <janneke@gnu.org>
- (c) 1997 Jan Nieuwenhuizen <jan@digicash.com>
+ LilyPond is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ LilyPond is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
*/
-#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 "lily-imports.hh"
+
+#include "translator.icc"
+
+class Key_performer : public Performer
+{
+public:
+ TRANSLATOR_DECLARATIONS (Key_performer);
+ ~Key_performer ();
+protected:
+ void process_music ();
+ void stop_translation_timestep ();
+ void listen_key_change (Stream_event *);
+private:
+ Stream_event *key_ev_;
+ Audio_key *audio_;
+};
-IMPLEMENT_IS_TYPE_B1(Key_performer,Performer);
-ADD_THIS_PERFORMER(Key_performer);
+Key_performer::Key_performer (Context *c)
+ : Performer (c)
+{
+ key_ev_ = 0;
+ audio_ = 0;
+}
-Key_performer::Key_performer()
+Key_performer::~Key_performer ()
{
- key_req_l_ = 0;
}
-Key_performer::~Key_performer()
+void
+Key_performer::process_music ()
{
+ if (key_ev_)
+ {
+ SCM pitchlist = key_ev_->get_property ("pitch-alist");
+
+ SCM acc = Lily::alterations_in_key (pitchlist);
+
+ Pitch key_do (0,
+ scm_to_int (scm_caar (pitchlist)),
+ ly_scm2rational (scm_cdar (pitchlist)));
+
+ Pitch c_do;
+
+ 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;
+ }
}
-void
-Key_performer::do_print() const
+void
+Key_performer::stop_translation_timestep ()
{
-#ifndef NPRINT
- if ( key_req_l_)
- key_req_l_->print();
-#endif
+ if (audio_)
+ {
+ audio_ = 0;
+ }
}
void
-Key_performer::process_requests()
+Key_performer::listen_key_change (Stream_event *ev)
{
- if ( key_req_l_)
- play (new Audio_key (key_req_l_) );
- key_req_l_ = 0;
+ if (!key_ev_)
+ key_ev_ = ev;
}
-bool
-Key_performer::do_try_request (Request* req_l)
+void
+Key_performer::boot ()
{
- if ( key_req_l_)
- return false;
+ ADD_LISTENER (Key_performer, key_change);
+}
- if ( req_l->command())
- key_req_l_ = req_l->command()->keychange ();
+ADD_TRANSLATOR (Key_performer,
+ /* doc */
+ "",
- if ( key_req_l_)
- return true;
+ /* create */
+ "",
- return false;
-}
+ /* read */
+ "",
+ /* write */
+ ""
+ );