source file of the GNU LilyPond music typesetter
- (c) 1997--2003 Jan Nieuwenhuizen <janneke@gnu.org>
+ (c) 1997--2008 Jan Nieuwenhuizen <janneke@gnu.org>
*/
+#include "performer.hh"
#include "audio-item.hh"
-#include "performer.hh"
+#include "duration.hh"
+#include "stream-event.hh"
+
+#include "translator.icc"
class Tempo_performer : public Performer
{
public:
- TRANSLATOR_DECLARATIONS(Tempo_performer);
+ TRANSLATOR_DECLARATIONS (Tempo_performer);
~Tempo_performer ();
protected:
- virtual bool try_music (Music* req);
- virtual void stop_translation_timestep ();
- virtual void create_audio_elements ();
-
+ virtual void derived_mark () const;
+ void stop_translation_timestep ();
+ void process_music ();
private:
-Music* tempo_req_;
- Audio_tempo* audio_;
+ Audio_tempo *audio_;
+ SCM last_tempo_;
};
+void
+Tempo_performer::derived_mark () const
+{
+ scm_gc_mark (last_tempo_);
+}
+
Tempo_performer::Tempo_performer ()
{
- tempo_req_ = 0;
+ last_tempo_ = SCM_EOL;
audio_ = 0;
}
{
}
-
void
-Tempo_performer::create_audio_elements ()
+Tempo_performer::process_music ()
{
- if (tempo_req_)
+ 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_->get_mus_property ("metronome-count");
- Duration *d = unsmob_duration (tempo_req_->get_mus_property ("tempo-unit"));
-
- Rational r = (d->get_length () / Moment (Rational (1, 4)) * Moment (gh_scm2int (met))).main_part_;
-
- audio_ = new Audio_tempo (int (r));
+ audio_ = new Audio_tempo (r.to_int ());
- Audio_element_info info (audio_, tempo_req_);
+ Audio_element_info info (audio_, 0);
announce_element (info);
- tempo_req_ = 0;
+
+ last_tempo_ = w;
}
}
{
if (audio_)
{
- play_element (audio_);
audio_ = 0;
}
}
-bool
-Tempo_performer::try_music (Music* req)
-{
- if (tempo_req_)
- return false;
-
- tempo_req_ = req;
- return true;
-}
-
+ADD_TRANSLATOR (Tempo_performer,
+ /* doc */
+ "",
+ /* create */
+ "",
+ /* read */
+ "tempoWholesPerMinute ",
-ENTER_DESCRIPTION (Tempo_performer, "","",
- "tempo-event",
- "","","" );
+ /* write */
+ ""
+ );