lily/note-performer.cc

   1 /*
   2   note-performer.cc -- implement 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 "warn.hh"
  15
  16 #include "translator.icc"
  17
  18 /**
  19    Convert evs to audio notes.
  20 */
  21 class Note_performer : public Performer
  22 {
  23 public:
  24   TRANSLATOR_DECLARATIONS (Note_performer);
  25
  26 protected:
  27   void stop_translation_timestep ();
  28   void process_music ();
  29
  30   DECLARE_TRANSLATOR_LISTENER (note);
  31 private:
  32   vector<Stream_event*> note_evs_;
  33   vector<Audio_note*> notes_;
  34 };
  35
  36 void
  37 Note_performer::process_music ()
  38 {
  39   if (note_evs_.size ())
  40     {
  41       Pitch transposing;
  42       SCM prop = get_property ("instrumentTransposition");
  43       if (unsmob_pitch (prop))
  44         transposing = *unsmob_pitch (prop);
  45
  46       while (note_evs_.size ())
  47         {
  48           Stream_event *n = note_evs_.back ();
  49           note_evs_.pop_back ();
  50           SCM pit = n->get_property ("pitch");
  51
  52           if (Pitch *pitp = unsmob_pitch (pit))
  53             {
  54               SCM articulations = n->get_property ("articulations");
  55               Stream_event *tie_event = 0;
  56               for (SCM s = articulations;
  57                    !tie_event && scm_is_pair (s);
  58                    s = scm_cdr (s))
  59                 {
  60                   Stream_event *ev = unsmob_stream_event (scm_car (s));
  61                   if (!ev)
  62                     continue;
  63
  64                   if (ev->in_event_class ("tie-event"))
  65                     tie_event = ev;
  66                 }
  67
  68               Moment len = get_event_length (n);
  69               if (now_mom().grace_part_)
  70                 {
  71                   len.grace_part_ = len.main_part_;
  72                   len.main_part_ = Rational (0);
  73                 }
  74
  75               Audio_note *p = new Audio_note (*pitp, len,
  76                                               tie_event, transposing.negated ());
  77               Audio_element_info info (p, n);
  78               announce_element (info);
  79               notes_.push_back (p);
  80             }
  81         }
  82       note_evs_.clear ();
  83     }
  84 }
  85
  86 void
  87 Note_performer::stop_translation_timestep ()
  88 {
  89   // why don't grace notes show up here?
  90   // --> grace notes effectively do not get delayed
  91   notes_.clear ();
  92   note_evs_.clear ();
  93 }
  94
  95 IMPLEMENT_TRANSLATOR_LISTENER (Note_performer, note)
  96 void
  97 Note_performer::listen_note (Stream_event *ev)
  98 {
  99   note_evs_.push_back (ev);
 100 }
 101
 102 ADD_TRANSLATOR (Note_performer, "", "",
 103                 "", "");
 104
 105 Note_performer::Note_performer ()
 106 {
 107 }