lily/tie-performer.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1998--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "performer.hh"
  21
  22 #include "audio-item.hh"
  23 #include "context.hh"
  24 #include "stream-event.hh"
  25 #include "translator.icc"
  26 #include <list>
  27
  28 struct Head_audio_event_tuple
  29 {
  30   Audio_element_info head_;
  31   // The end moment of the note, so we can calculate a skip and check whether
  32   // the note still goes on
  33   Moment end_moment_;
  34   Head_audio_event_tuple () {}
  35   Head_audio_event_tuple (Audio_element_info h, Moment m)
  36   {
  37     head_ = h;
  38     end_moment_ = m;
  39   }
  40 };
  41
  42
  43 class Tie_performer : public Performer
  44 {
  45   Stream_event *event_;
  46   list<Head_audio_event_tuple> now_heads_;
  47   list<Head_audio_event_tuple> now_tied_heads_; // new tied notes
  48   list<Head_audio_event_tuple> heads_to_tie_; // heads waiting for closing tie
  49
  50 protected:
  51   void stop_translation_timestep ();
  52   void start_translation_timestep ();
  53   virtual void acknowledge_audio_element (Audio_element_info);
  54   void process_music ();
  55   DECLARE_TRANSLATOR_LISTENER (tie);
  56 public:
  57   TRANSLATOR_DECLARATIONS (Tie_performer);
  58 };
  59
  60 Tie_performer::Tie_performer ()
  61 {
  62   event_ = 0;
  63 }
  64
  65 IMPLEMENT_TRANSLATOR_LISTENER (Tie_performer, tie);
  66 void
  67 Tie_performer::listen_tie (Stream_event *ev)
  68 {
  69   event_ = ev;
  70 }
  71
  72 void
  73 Tie_performer::process_music ()
  74 {
  75   if (event_)
  76     context ()->set_property ("tieMelismaBusy", SCM_BOOL_T);
  77 }
  78
  79 void
  80 Tie_performer::acknowledge_audio_element (Audio_element_info inf)
  81 {
  82   if (Audio_note *an = dynamic_cast<Audio_note *> (inf.elem_))
  83     {
  84       // for each tied note, store the info and its end moment, so we can
  85       // later on check whether (1) the note is still ongoing and (2) how
  86       // long the skip is with tieWaitForNote
  87       Head_audio_event_tuple inf_mom (inf, now_mom () + an->length_mom_);
  88       if (an->tie_event_)
  89         now_tied_heads_.push_back (inf_mom);
  90       else
  91         now_heads_.push_back (inf_mom);
  92
  93       // Find a previous note that ties to the current note. If it exists,
  94       // remove it from the heads_to_tie vector and create the tie
  95       list<Head_audio_event_tuple>::iterator it;
  96       bool found = false;
  97       Stream_event *right_mus = inf.event_;
  98         for (it = heads_to_tie_.begin ();
  99              !found && (it != heads_to_tie_.end());
 100              it++)
 101         {
 102           Audio_element_info et = (*it).head_;
 103           Audio_note *th = dynamic_cast<Audio_note *> (et.elem_);
 104           Stream_event *left_mus = et.event_;
 105
 106           if (th && right_mus && left_mus
 107               && ly_is_equal (right_mus->get_property ("pitch"),
 108                               left_mus->get_property ("pitch")))
 109             {
 110               found = true;
 111               // (*it).moment_ already stores the end of the tied note!
 112               Moment skip = now_mom() - (*it).end_moment_;
 113               an->tie_to (th, skip);
 114               // this invalidates the iterator, we are leaving the loop anyway
 115               heads_to_tie_.erase (it);
 116             }
 117         }
 118     }
 119 }
 120
 121 void
 122 Tie_performer::start_translation_timestep ()
 123 {
 124   context ()->set_property ("tieMelismaBusy",
 125                             ly_bool2scm (heads_to_tie_.size ()));
 126 }
 127
 128 // a predicate implemented as a class, used to delete all tied notes with end
 129 // moment in the past:
 130 class end_moment_passed
 131 {
 132 protected:
 133   Moment now;
 134 public:
 135   end_moment_passed (Moment mom) : now (mom) {}
 136   bool operator() (const Head_audio_event_tuple &value) {
 137     return (value.end_moment_ <= now);
 138   }
 139 };
 140
 141 void
 142 Tie_performer::stop_translation_timestep ()
 143 {
 144   // We might have dangling open ties like c~ d. Close them, unless the first
 145   // note is still ongoing or we have we have tieWaitForNote set...
 146   if (!to_boolean (get_property ("tieWaitForNote")))
 147     {
 148       heads_to_tie_.remove_if (end_moment_passed (now_mom ()));
 149     }
 150
 151   // Append now_heads_ and now_tied_heads to heads_to_tie_ for the next time step
 152   if (event_)
 153     {
 154       heads_to_tie_.splice (heads_to_tie_.end (), now_heads_);
 155     }
 156   heads_to_tie_.splice (heads_to_tie_.end (), now_tied_heads_);
 157
 158   event_ = 0;
 159   now_heads_.clear ();
 160   now_tied_heads_.clear ();
 161 }
 162
 163 ADD_TRANSLATOR (Tie_performer,
 164                 /* doc */
 165                 "Generate ties between note heads of equal pitch.",
 166
 167                 /* create */
 168                 "",
 169
 170                 /* read */
 171                 "tieWaitForNote",
 172
 173                 /* write */
 174                 "tieMelismaBusy"
 175                 );