#include "performer.hh"
#include "audio-item.hh"
+#include "music.hh"
#include "duration.hh"
-#include "stream-event.hh"
-
-#include "translator.icc"
class Tempo_performer : public Performer
{
protected:
- virtual void derived_mark () const;
+ virtual bool try_music (Music *event);
void stop_translation_timestep ();
void process_music ();
+
private:
+ Music *tempo_event_;
Audio_tempo *audio_;
- SCM last_tempo_;
};
-void
-Tempo_performer::derived_mark () const
-{
- scm_gc_mark (last_tempo_);
-}
-
Tempo_performer::Tempo_performer ()
{
- last_tempo_ = SCM_EOL;
+ tempo_event_ = 0;
audio_ = 0;
}
void
Tempo_performer::process_music ()
{
- SCM w = get_property ("tempoWholesPerMinute");
- if (unsmob_moment (w)
- && !ly_is_equal (w, last_tempo_))
+ if (tempo_event_)
{
- Rational r = unsmob_moment (w)->main_part_;
- r *= Rational (4, 1);
+ SCM met = tempo_event_->get_property ("metronome-count");
+ Duration *d = unsmob_duration (tempo_event_->get_property ("tempo-unit"));
+
+ Rational r = (d->get_length () / Moment (Rational (1, 4)) * Moment (scm_to_int (met))).main_part_;
audio_ = new Audio_tempo (r.to_int ());
- Audio_element_info info (audio_, 0);
+ Audio_element_info info (audio_, tempo_event_);
announce_element (info);
-
- last_tempo_ = w;
+ tempo_event_ = 0;
}
}
{
if (audio_)
{
+ play_element (audio_);
audio_ = 0;
}
}
+bool
+Tempo_performer::try_music (Music *event)
+{
+ if (tempo_event_)
+ return false;
+
+ tempo_event_ = event;
+ return true;
+}
+
+#include "translator.icc"
+
ADD_TRANSLATOR (Tempo_performer, "", "",
- "",
- "tempoWholesPerMinute ",
- "");
+ "metronome-change-event",
+ "", "");