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--2004 Jan Nieuwenhuizen <janneke@gnu.org>
   7  */
   8
   9 #include "performer.hh"
  10 #include "event.hh"
  11 #include "audio-item.hh"
  12 #include "audio-column.hh"
  13 #include "global-context.hh"
  14 #include "warn.hh"
  15
  16 class Drum_note_performer : public Performer {
  17 public:
  18   TRANSLATOR_DECLARATIONS (Drum_note_performer);
  19
  20 protected:
  21   virtual bool try_music (Music *ev) ;
  22   virtual void stop_translation_timestep ();
  23   virtual void create_audio_elements ();
  24 private:
  25   Link_array<Music> note_evs_;
  26   Link_array<Audio_note> notes_;
  27   Link_array<Audio_note> delayeds_;
  28 };
  29
  30 void
  31 Drum_note_performer::create_audio_elements ()
  32 {
  33   SCM tab =0;
  34   if (!tab) tab = get_property ("drumPitchTable");
  35
  36   while (note_evs_.size ())
  37     {
  38       Music* n = note_evs_.pop ();
  39       SCM sym = n->get_property ("drum-type");
  40       SCM defn = SCM_EOL;
  41
  42       if (ly_c_symbol_p (sym)
  43           &&  (scm_hash_table_p (tab) == SCM_BOOL_T))
  44         defn = scm_hashq_ref (tab, sym, SCM_EOL);
  45
  46       if (Pitch * pit = unsmob_pitch (defn))
  47         {
  48           Audio_note* p = new Audio_note (*pit,  n->get_length (), 0);
  49           Audio_element_info info (p, n);
  50           announce_element (info);
  51           notes_.push (p);
  52         }
  53     }
  54
  55   note_evs_.clear ();
  56 }
  57
  58 void
  59 Drum_note_performer::stop_translation_timestep ()
  60 {
  61   // why don't grace notes show up here?
  62   // --> grace notes effectively do not get delayed
  63   Global_context * global = get_global_context ();
  64   for (int i=0; i < notes_.size (); i++)
  65     {
  66       Audio_note* n = notes_[i];
  67       Moment m= n->delayed_until_mom_;
  68       if (m.to_bool ())
  69         {
  70           global->add_moment_to_process (m);
  71           delayeds_.push (n);
  72           notes_[i] = 0;
  73           notes_.del (i);
  74           i--;
  75         }
  76     }
  77
  78   Moment now = now_mom ();
  79   for (int i=0; i < notes_.size (); i++)
  80     {
  81       play_element (notes_[i]);
  82     }
  83   notes_.clear ();
  84   note_evs_.clear ();
  85   for (int i=0; i < delayeds_.size (); i++)
  86     {
  87       Audio_note* n = delayeds_[i];
  88       if (n->delayed_until_mom_ <= now)
  89         {
  90           play_element (n);
  91           delayeds_[i] = 0;
  92           delayeds_.del (i);
  93           i--;
  94         }
  95     }
  96 }
  97
  98 bool
  99 Drum_note_performer::try_music (Music* ev)
 100 {
 101   if (ev->is_mus_type ("note-event"))
 102     {
 103       note_evs_.push (ev);
 104       return true;
 105     }
 106   else if (ev->is_mus_type ("busy-playing-event"))
 107     return note_evs_.size ();
 108
 109   return false;
 110 }
 111
 112 ENTER_DESCRIPTION (Drum_note_performer,
 113                   "Play drum notes.","",
 114                   "note-event busy-playing-event","","","");
 115
 116 Drum_note_performer::Drum_note_performer ()
 117 {
 118 }