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--2005 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 "warn.hh"
  14 #include "music.hh"
  15
  16 /**
  17    Convert evs to audio notes.
  18 */
  19 class Note_performer : public Performer
  20 {
  21 public:
  22   TRANSLATOR_DECLARATIONS (Note_performer);
  23
  24 protected:
  25   virtual bool try_music (Music *ev);
  26
  27   void stop_translation_timestep ();
  28   virtual void create_audio_elements ();
  29
  30 private:
  31   Link_array<Music> note_evs_;
  32   Link_array<Audio_note> notes_;
  33 };
  34
  35 void
  36 Note_performer::create_audio_elements ()
  37 {
  38   if (note_evs_.size ())
  39     {
  40       int transposing = 0;
  41
  42       SCM prop = get_property ("instrumentTransposition");
  43       if (unsmob_pitch (prop))
  44         transposing = unsmob_pitch (prop)->semitone_pitch ();
  45
  46       while (note_evs_.size ())
  47         {
  48           Music *n = note_evs_.pop ();
  49           SCM pit = n->get_property ("pitch");
  50
  51           if (Pitch *pitp = unsmob_pitch (pit))
  52             {
  53               Audio_note *p = new Audio_note (*pitp, n->get_length (), - transposing);
  54               Audio_element_info info (p, n);
  55               announce_element (info);
  56               notes_.push (p);
  57             }
  58         }
  59       note_evs_.clear ();
  60     }
  61 }
  62
  63 void
  64 Note_performer::stop_translation_timestep ()
  65 {
  66   // why don't grace notes show up here?
  67   // --> grace notes effectively do not get delayed
  68   Moment now = now_mom ();
  69   for (int i = 0; i < notes_.size (); i++)
  70     {
  71       play_element (notes_[i]);
  72     }
  73   notes_.clear ();
  74   note_evs_.clear ();
  75 }
  76
  77 bool
  78 Note_performer::try_music (Music *ev)
  79 {
  80   if (ev->is_mus_type ("note-event"))
  81     {
  82       note_evs_.push (ev);
  83       return true;
  84     }
  85   else if (ev->is_mus_type ("busy-playing-event"))
  86     return note_evs_.size ();
  87
  88   return false;
  89 }
  90
  91 #include "translator.icc"
  92
  93 ADD_TRANSLATOR (Note_performer, "", "",
  94                 "note-event busy-playing-event",
  95                 "", "");
  96
  97 Note_performer::Note_performer ()
  98 {
  99 }