lily/tie-performer.cc

   1 /*
   2   tie-performer.cc --  implement Tie_performer
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1999--2003 Jan Nieuwenhuizen <janneke@gnu.org>
   7
   8  */
   9
  10
  11 #include "audio-item.hh"
  12 #include "event.hh"
  13 #include "pqueue.hh"
  14 #include "performer.hh"
  15
  16 struct CNote_melodic_tuple {
  17   Music *event_ ;
  18   Audio_note *note_;
  19   Moment end_;
  20   CNote_melodic_tuple ();
  21   CNote_melodic_tuple (Audio_note*, Music*, Moment);
  22   static int pitch_compare (CNote_melodic_tuple const &, CNote_melodic_tuple const &);
  23   static int time_compare (CNote_melodic_tuple const &, CNote_melodic_tuple const &);
  24 };
  25
  26 inline int compare (CNote_melodic_tuple const &a, CNote_melodic_tuple const &b)
  27 {
  28   return CNote_melodic_tuple::time_compare (a,b);
  29 }
  30
  31
  32 /**
  33    Manufacture ties.  Acknowledge notes, and put them into a
  34    priority queue. If we have a Music, connect the notes that finish
  35    just at this time, and note that start at this time.
  36
  37    TODO: should share code with Tie_engraver ?
  38  */
  39 class Tie_performer : public Performer
  40 {
  41 public:
  42   TRANSLATOR_DECLARATIONS(Tie_performer);
  43 private:
  44
  45   bool ties_created_;
  46   Array<CNote_melodic_tuple> now_notes_;
  47   Array<CNote_melodic_tuple> tied_notes_;
  48
  49   Music *event_;
  50   Music * prev_event_;
  51
  52   Link_array<Audio_tie> ties_;
  53
  54 protected:
  55   virtual void initialize ();
  56   virtual void start_translation_timestep ();
  57   virtual void stop_translation_timestep ();
  58   virtual void acknowledge_audio_element (Audio_element_info);
  59   virtual bool try_music (Music*);
  60   virtual void create_audio_elements ();
  61 };
  62
  63
  64 Tie_performer::Tie_performer ()
  65 {
  66   event_ = 0;
  67   ties_created_ = false;
  68 }
  69
  70 ENTER_DESCRIPTION (Tie_performer, "", "",
  71                    "tie-event",
  72                    "", "", "");
  73
  74
  75 void
  76 Tie_performer::initialize ()
  77 {
  78   event_ = 0;
  79 }
  80
  81
  82 bool
  83 Tie_performer::try_music (Music *m)
  84 {
  85   if (!event_)
  86     {
  87       event_ = m;
  88       return true;
  89     }
  90   return false;
  91 }
  92
  93 void
  94 Tie_performer::acknowledge_audio_element (Audio_element_info i)
  95 {
  96   if (Audio_note *nh = dynamic_cast<Audio_note *> (i.elem_))
  97     {
  98       Music *m = i.event_;
  99       if (m->is_mus_type ("note-event"))
 100         now_notes_.push (CNote_melodic_tuple (nh, m, now_mom ()+ m->get_length ()));
 101     }
 102 }
 103
 104 void
 105 Tie_performer::create_audio_elements ()
 106 {
 107   /*
 108     This is a nested loop. Not optimal, but good enough.
 109    */
 110   if (tied_notes_.size ())
 111     {
 112       Moment now = now_mom();
 113       for (int i = tied_notes_.size (); i--; )
 114         {
 115           if (tied_notes_[i].end_ != now)
 116             continue;
 117
 118           for (int j = now_notes_.size(); j--;)
 119             {
 120               int comp
 121                 = Pitch::compare (*unsmob_pitch (tied_notes_[i].event_->get_mus_property ("pitch")),
 122                                   *unsmob_pitch (now_notes_[j].event_->get_mus_property ("pitch")));
 123
 124               if (comp == 0)
 125                 {
 126
 127                   Audio_tie * p = new Audio_tie;
 128                   p->set_note (LEFT, tied_notes_[i].note_);
 129                   p->set_note (RIGHT, now_notes_[j].note_);
 130                   ties_.push (p);
 131                   announce_element (Audio_element_info (p, event_));
 132                   ties_created_ = true;
 133
 134                   tied_notes_.del (i);
 135                   break ;
 136                 }
 137             }
 138         }
 139     }
 140 }
 141
 142
 143 void
 144 Tie_performer::stop_translation_timestep ()
 145 {
 146   if (prev_event_ && tied_notes_.size () && !ties_.size ()
 147       && now_notes_.size ())
 148     {
 149       prev_event_->origin ()->warning (_ ("No ties were performed."));
 150     }
 151
 152   if (ties_created_)
 153     {
 154       prev_event_ = 0;
 155       tied_notes_.clear();
 156     }
 157
 158   if (event_)
 159     {
 160       tied_notes_ = now_notes_ ;
 161       prev_event_ = event_;
 162     }
 163
 164   event_ = 0;
 165   now_notes_ .clear ();
 166
 167   for (int i=ties_.size (); i--;)
 168     {
 169       ties_[i]->note_drul_[RIGHT]->tie_to (ties_[i]->note_drul_[LEFT]);
 170     }
 171
 172   ties_.clear ();
 173 }
 174
 175 void
 176 Tie_performer::start_translation_timestep ()
 177 {
 178   event_ =0;
 179   ties_created_ = false;
 180   Moment now = now_mom ();
 181   for (int i= tied_notes_.size (); i-- ;)
 182     {
 183       if (tied_notes_[i].end_ < now)
 184         tied_notes_.del (i);
 185       else
 186         break ;
 187     }
 188 }
 189
 190
 191 CNote_melodic_tuple::CNote_melodic_tuple ()
 192 {
 193   note_ =0;
 194   event_ =0;
 195   end_ = 0;
 196 }
 197
 198 CNote_melodic_tuple::CNote_melodic_tuple (Audio_note *h, Music*m, Moment mom)
 199 {
 200   note_ = h;
 201   event_ = m;
 202   end_ = mom;
 203 }
 204
 205 int
 206 CNote_melodic_tuple::pitch_compare (CNote_melodic_tuple const&h1,
 207                                     CNote_melodic_tuple const &h2)
 208 {
 209   SCM p1  = h1.event_->get_mus_property ("pitch");
 210   SCM p2  = h2.event_->get_mus_property ("pitch");
 211   return Pitch::compare (*unsmob_pitch (p1),
 212                                *unsmob_pitch (p2));
 213 }
 214
 215 int
 216 CNote_melodic_tuple::time_compare (CNote_melodic_tuple const&h1,
 217                                    CNote_melodic_tuple const &h2)
 218 {
 219   return (h1.end_ - h2.end_).main_part_.sign ();
 220 }
 221