lily/piano-pedal-performer.cc

   1 /*
   2   piano-pedal-performer.cc -- implement Piano_pedal_performer
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000--2005 Jan Nieuwenhuizen <janneke@gnu.org>
   7 */
   8
   9 #include "performer.hh"
  10 #include "audio-item.hh"
  11 #include "music.hh"
  12
  13 /**
  14    perform Piano pedals
  15 */
  16 class Piano_pedal_performer : public Performer
  17 {
  18   struct Pedal_info
  19   {
  20     char const *name_;
  21     Music *start_event_;
  22     Drul_array<Music *> event_drul_;
  23   };
  24
  25 public:
  26   TRANSLATOR_DECLARATIONS (Piano_pedal_performer);
  27   ~Piano_pedal_performer ();
  28
  29 protected:
  30   virtual void initialize ();
  31   virtual bool try_music (Music *);
  32   void process_music ();
  33   void stop_translation_timestep ();
  34   void start_translation_timestep ();
  35
  36 private:
  37   Link_array<Audio_piano_pedal> audios_;
  38   Pedal_info *info_alist_;
  39 };
  40
  41 Piano_pedal_performer::Piano_pedal_performer ()
  42 {
  43   info_alist_ = 0;
  44 }
  45
  46 Piano_pedal_performer::~Piano_pedal_performer ()
  47 {
  48   delete[] info_alist_;
  49 }
  50
  51 void
  52 Piano_pedal_performer::initialize ()
  53 {
  54   info_alist_ = new Pedal_info[4];
  55   Pedal_info *p = info_alist_;
  56
  57   char *names [] = { "Sostenuto", "Sustain", "UnaCorda", 0 };
  58   char **np = names;
  59   do
  60     {
  61       p->name_ = *np;
  62       p->event_drul_[START] = 0;
  63       p->event_drul_[STOP] = 0;
  64       p->start_event_ = 0;
  65
  66       p++;
  67     }
  68   while (* (np++));
  69 }
  70
  71 void
  72 Piano_pedal_performer::process_music ()
  73 {
  74   for (Pedal_info *p = info_alist_; p && p->name_; p++)
  75
  76     {
  77       if (p->event_drul_[STOP])
  78         {
  79           if (!p->start_event_)
  80             p->event_drul_[STOP]->origin ()->warning (_f ("can't find start of piano pedal: `%s'", String (p->name_)));
  81           else
  82             {
  83               Audio_piano_pedal *a = new Audio_piano_pedal;
  84               a->type_string_ = String (p->name_);
  85               a->dir_ = STOP;
  86               audios_.push (a);
  87               Audio_element_info info(a, p->event_drul_[STOP]);
  88               announce_element (info);
  89             }
  90           p->start_event_ = 0;
  91         }
  92
  93       if (p->event_drul_[START])
  94         {
  95           p->start_event_ = p->event_drul_[START];
  96           Audio_piano_pedal *a = new Audio_piano_pedal;
  97           a->type_string_ = String (p->name_);
  98           a->dir_ = START;
  99           audios_.push (a);
 100           Audio_element_info info(a, p->event_drul_[START]);
 101           announce_element (info);
 102         }
 103       p->event_drul_[START] = 0;
 104       p->event_drul_[STOP] = 0;
 105     }
 106 }
 107
 108 void
 109 Piano_pedal_performer::stop_translation_timestep ()
 110 {
 111   for (int i = 0; i < audios_.size (); i++)
 112     play_element (audios_[i]);
 113   audios_.clear ();
 114 }
 115
 116 void
 117 Piano_pedal_performer::start_translation_timestep ()
 118 {
 119   for (Pedal_info *p = info_alist_; p && p->name_; p++)
 120     {
 121       p->event_drul_[STOP] = 0;
 122       p->event_drul_[START] = 0;
 123     }
 124 }
 125
 126 bool
 127 Piano_pedal_performer::try_music (Music *r)
 128 {
 129   if (r->is_mus_type ("pedal-event"))
 130     {
 131       for (Pedal_info *p = info_alist_; p->name_; p++)
 132         {
 133           String nm = p->name_ + String ("Event");
 134           if (ly_is_equal (r->get_property ("name"),
 135                            scm_str2symbol (nm.to_str0 ())))
 136             {
 137               Direction d = to_dir (r->get_property ("span-direction"));
 138               p->event_drul_[d] = r;
 139               return true;
 140             }
 141         }
 142     }
 143   return false;
 144 }
 145
 146 #include "translator.icc"
 147
 148 ADD_TRANSLATOR (Piano_pedal_performer, "", "",
 149                 "pedal-event",
 150                 "", "");