lily/drum-note-performer.cc

   1 /*
   2   note-performer.cc -- implement Drum_note_performer
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1996--2007 Jan Nieuwenhuizen <janneke@gnu.org>
   7 */
   8
   9 #include "performer.hh"
  10 #include "audio-item.hh"
  11 #include "audio-column.hh"
  12 #include "global-context.hh"
  13 #include "stream-event.hh"
  14 #include "translator.icc"
  15 #include "warn.hh"
  16
  17 class Drum_note_performer : public Performer
  18 {
  19 public:
  20   TRANSLATOR_DECLARATIONS (Drum_note_performer);
  21
  22 protected:
  23   void stop_translation_timestep ();
  24   void process_music ();
  25   DECLARE_TRANSLATOR_LISTENER (note);
  26 private:
  27   vector<Stream_event*> note_evs_;
  28   vector<Audio_note*> notes_;
  29 };
  30
  31 Drum_note_performer::Drum_note_performer ()
  32 {
  33 }
  34
  35 void
  36 Drum_note_performer::process_music ()
  37 {
  38   SCM tab = get_property ("drumPitchTable");
  39
  40   while (note_evs_.size ())
  41     {
  42       Stream_event *n = note_evs_.back ();
  43       note_evs_.pop_back ();
  44       SCM sym = n->get_property ("drum-type");
  45       SCM defn = SCM_EOL;
  46
  47       if (scm_is_symbol (sym)
  48           && (scm_hash_table_p (tab) == SCM_BOOL_T))
  49         defn = scm_hashq_ref (tab, sym, SCM_EOL);
  50
  51       if (Pitch *pit = unsmob_pitch (defn))
  52         {
  53           SCM articulations = n->get_property ("articulations");
  54           Stream_event *tie_event = 0;
  55           for (SCM s = articulations;
  56                !tie_event && scm_is_pair (s);
  57                s = scm_cdr (s))
  58             {
  59               Stream_event *ev = unsmob_stream_event (scm_car (s));
  60               if (!ev)
  61                 continue;
  62
  63               if (ev->in_event_class ("tie-event"))
  64                 tie_event = ev;
  65             }
  66
  67           Moment len = get_event_length (n);
  68           if (now_mom().grace_part_)
  69             {
  70               len.grace_part_ = len.main_part_;
  71               len.main_part_ = Rational (0);
  72             }
  73
  74
  75           Audio_note *p = new Audio_note (*pit, len,
  76                                           tie_event, Pitch (0, 0, 0));
  77           Audio_element_info info (p, n);
  78           announce_element (info);
  79           notes_.push_back (p);
  80         }
  81     }
  82
  83   note_evs_.clear ();
  84 }
  85
  86 void
  87 Drum_note_performer::stop_translation_timestep ()
  88 {
  89   notes_.clear ();
  90   note_evs_.clear ();
  91 }
  92
  93 IMPLEMENT_TRANSLATOR_LISTENER (Drum_note_performer, note);
  94 void
  95 Drum_note_performer::listen_note (Stream_event *ev)
  96 {
  97   note_evs_.push_back (ev);
  98 }
  99
 100 ADD_TRANSLATOR (Drum_note_performer,
 101                 "Play drum notes.", "", "", "");