/*
- tempo-performer.cc -- implement Tempo_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--2000 Jan Nieuwenhuizen <janneke@gnu.org>
+ 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 "command-request.hh"
-#include "audio-item.hh"
#include "performer.hh"
+#include "audio-item.hh"
+#include "duration.hh"
+#include "stream-event.hh"
+
+#include "translator.icc"
+
class Tempo_performer : public Performer
{
public:
- VIRTUAL_COPY_CONS(Translator);
-
- Tempo_performer();
- ~Tempo_performer();
+ TRANSLATOR_DECLARATIONS (Tempo_performer);
+ ~Tempo_performer ();
protected:
- virtual bool try_music (Music* req_l);
- virtual void stop_translation_timestep ();
- virtual void create_grobs ();
-
+ virtual void derived_mark () const;
+ void stop_translation_timestep ();
+ void process_music ();
private:
- Tempo_req* tempo_req_l_;
- Audio_tempo* audio_p_;
+ Audio_tempo *audio_;
+ SCM last_tempo_;
};
-ADD_THIS_TRANSLATOR (Tempo_performer);
+void
+Tempo_performer::derived_mark () const
+{
+ scm_gc_mark (last_tempo_);
+}
-Tempo_performer::Tempo_performer ()
+Tempo_performer::Tempo_performer (Context *c)
+ : Performer (c)
{
- tempo_req_l_ = 0;
- audio_p_ = 0;
+ last_tempo_ = SCM_EOL;
+ audio_ = 0;
}
Tempo_performer::~Tempo_performer ()
{
}
-
void
-Tempo_performer::create_grobs ()
+Tempo_performer::process_music ()
{
- if (tempo_req_l_)
+ SCM w = get_property ("tempoWholesPerMinute");
+ if (unsmob<Moment> (w)
+ && !ly_is_equal (w, last_tempo_))
{
+ Rational r = unsmob<Moment> (w)->main_part_;
+ r *= Rational (4, 1);
- SCM met = tempo_req_l_->get_mus_property ("metronome-count");
- audio_p_ = new Audio_tempo (tempo_req_l_->dur_.length_mom () /
- Moment (1, 4)
- * Moment(gh_scm2int (met)));
+ audio_ = new Audio_tempo (r.to_int ());
- Audio_element_info info (audio_p_, tempo_req_l_);
+ Audio_element_info info (audio_, 0);
announce_element (info);
- tempo_req_l_ = 0;
+
+ last_tempo_ = w;
}
}
void
Tempo_performer::stop_translation_timestep ()
{
- if (audio_p_)
+ if (audio_)
{
- play_element (audio_p_);
- audio_p_ = 0;
+ audio_ = 0;
}
}
-bool
-Tempo_performer::try_music (Music* req_l)
+void
+Tempo_performer::boot ()
{
- if (tempo_req_l_)
- return false;
- if (Tempo_req *t =
- dynamic_cast <Tempo_req *> (req_l))
- {
- tempo_req_l_ = t;
- return true;
- }
-
- return false;
}
+ADD_TRANSLATOR (Tempo_performer,
+ /* doc */
+ "",
+
+ /* create */
+ "",
+
+ /* read */
+ "tempoWholesPerMinute ",
+
+ /* write */
+ ""
+ );