source file of the GNU LilyPond music typesetter
- (c) 1997--1999 Jan Nieuwenhuizen <janneke@gnu.org>
+ (c) 1997--2007 Jan Nieuwenhuizen <janneke@gnu.org>
*/
-#include "tempo-performer.hh"
-#include "command-request.hh"
+#include "performer.hh"
+
#include "audio-item.hh"
+#include "duration.hh"
+#include "stream-event.hh"
-ADD_THIS_TRANSLATOR (Tempo_performer);
+#include "translator.icc"
-Tempo_performer::Tempo_performer ()
+class Tempo_performer : public Performer
{
- tempo_req_l_ = 0;
- audio_p_ = 0;
-}
+public:
+ TRANSLATOR_DECLARATIONS (Tempo_performer);
+ ~Tempo_performer ();
-Tempo_performer::~Tempo_performer ()
+protected:
+
+ virtual void derived_mark () const;
+ void stop_translation_timestep ();
+ void process_music ();
+private:
+ Audio_tempo *audio_;
+ SCM last_tempo_;
+};
+
+void
+Tempo_performer::derived_mark () const
{
+ scm_gc_mark (last_tempo_);
}
-void
-Tempo_performer::do_print () const
+Tempo_performer::Tempo_performer ()
{
-#ifndef NPRINT
- if (tempo_req_l_)
- tempo_req_l_->print ();
-#endif
+ last_tempo_ = SCM_EOL;
+ audio_ = 0;
}
-void
-Tempo_performer::do_process_requests ()
+Tempo_performer::~Tempo_performer ()
{
- if (tempo_req_l_)
- {
- audio_p_ = new Audio_tempo (tempo_req_l_->dur_.length_mom () /
- Moment (1, 4)
- * Moment(tempo_req_l_->metronome_i_));
- Audio_element_info info (audio_p_, tempo_req_l_);
- announce_element (info);
- tempo_req_l_ = 0;
- }
}
void
-Tempo_performer::do_pre_move_processing ()
+Tempo_performer::process_music ()
{
- if (audio_p_)
+ SCM w = get_property ("tempoWholesPerMinute");
+ if (unsmob_moment (w)
+ && !ly_is_equal (w, last_tempo_))
{
- play_element (audio_p_);
- audio_p_ = 0;
+ Rational r = unsmob_moment (w)->main_part_;
+ r *= Rational (4, 1);
+
+ audio_ = new Audio_tempo (r.to_int ());
+
+ Audio_element_info info (audio_, 0);
+ announce_element (info);
+
+ last_tempo_ = w;
}
}
-bool
-Tempo_performer::do_try_music (Music* req_l)
+void
+Tempo_performer::stop_translation_timestep ()
{
- if (tempo_req_l_)
- return false;
-
- if (Tempo_req *t =
- dynamic_cast <Tempo_req *> (req_l))
+ if (audio_)
{
- tempo_req_l_ = t;
- return true;
+ audio_ = 0;
}
-
- return false;
}
+ADD_TRANSLATOR (Tempo_performer, "", "",
+ "tempoWholesPerMinute ",
+ "");