lily/dynamic-performer.cc

   1 /*
   2   dynamic-performer.cc -- implement Dynamic_performer
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000--2007 Jan Nieuwenhuizen <janneke@gnu.org>
   7 */
   8
   9 #include "performer.hh"
  10 #include "audio-item.hh"
  11 #include "stream-event.hh"
  12
  13 #include "translator.icc"
  14
  15 class Dynamic_performer : public Performer
  16 {
  17 public:
  18   TRANSLATOR_DECLARATIONS (Dynamic_performer);
  19 protected:
  20   void stop_translation_timestep ();
  21   void process_music ();
  22   Real equalize_volume (Real);
  23
  24   DECLARE_TRANSLATOR_LISTENER (decrescendo);
  25   DECLARE_TRANSLATOR_LISTENER (crescendo);
  26   DECLARE_TRANSLATOR_LISTENER (absolute_dynamic);
  27 private:
  28   Stream_event *script_event_;
  29   Drul_array<Stream_event*> span_events_;
  30   Drul_array<Direction> grow_dir_;
  31   Real last_volume_;
  32   Audio_dynamic *absolute_;
  33   Audio_span_dynamic *span_dynamic_;
  34   Audio_span_dynamic *finished_span_dynamic_;
  35 };
  36
  37 Dynamic_performer::Dynamic_performer ()
  38 {
  39   last_volume_ = 0.5;
  40   script_event_ = 0;
  41   absolute_ = 0;
  42   span_events_[LEFT] =
  43     span_events_[RIGHT] = 0;
  44   span_dynamic_ = 0;
  45   finished_span_dynamic_ = 0;
  46 }
  47
  48 Real
  49 Dynamic_performer::equalize_volume (Real volume)
  50 {
  51   /*
  52     properties override default equaliser setting
  53   */
  54   SCM min = get_property ("midiMinimumVolume");
  55   SCM max = get_property ("midiMaximumVolume");
  56   if (scm_is_number (min) || scm_is_number (max))
  57     {
  58       Interval iv (0, 1);
  59       if (scm_is_number (min))
  60         iv[MIN] = scm_to_double (min);
  61       if (scm_is_number (max))
  62         iv[MAX] = scm_to_double (max);
  63       volume = iv[MIN] + iv.length () * volume;
  64     }
  65   else
  66     {
  67       /*
  68         urg, code duplication:: staff_performer
  69       */
  70       SCM s = get_property ("midiInstrument");
  71
  72       if (!scm_is_string (s))
  73         s = get_property ("instrumentName");
  74
  75       if (!scm_is_string (s))
  76         s = scm_from_locale_string ("piano");
  77
  78       SCM eq = get_property ("instrumentEqualizer");
  79       if (ly_is_procedure (eq))
  80         s = scm_call_1 (eq, s);
  81
  82       if (is_number_pair (s))
  83         {
  84           Interval iv = ly_scm2interval (s);
  85           volume = iv[MIN] + iv.length () * volume;
  86         }
  87     }
  88   return volume;
  89 }
  90
  91
  92 void
  93 Dynamic_performer::process_music ()
  94 {
  95   if (span_events_[STOP] || script_event_)
  96     {
  97       finished_span_dynamic_ = span_dynamic_;
  98       span_dynamic_ = 0;
  99     }
 100
 101   if (span_events_[START])
 102     {
 103       span_dynamic_ = new Audio_span_dynamic ();
 104       announce_element (Audio_element_info (span_dynamic_, span_events_[START]));
 105
 106       span_dynamic_->grow_dir_ = grow_dir_[START];
 107     }
 108
 109   if (script_event_
 110       || span_dynamic_
 111       || finished_span_dynamic_)
 112     {
 113       absolute_ = new Audio_dynamic ();
 114
 115       if (script_event_)
 116         {
 117           SCM proc = get_property ("dynamicAbsoluteVolumeFunction");
 118
 119           SCM svolume = SCM_EOL;
 120           if (ly_is_procedure (proc))
 121             {
 122               // urg
 123               svolume = scm_call_1 (proc, script_event_->get_property ("text"));
 124             }
 125
 126           Real volume = robust_scm2double (svolume, 0.5);
 127
 128           last_volume_
 129             = absolute_->volume_ = equalize_volume (volume);
 130         }
 131
 132       Audio_element_info info (absolute_, script_event_);
 133       announce_element (info);
 134     }
 135
 136
 137   if (span_dynamic_)
 138     span_dynamic_->add_absolute (absolute_);
 139
 140   if (finished_span_dynamic_)
 141     finished_span_dynamic_->add_absolute (absolute_);
 142 }
 143
 144 void
 145 Dynamic_performer::stop_translation_timestep ()
 146 {
 147   if (finished_span_dynamic_)
 148     {
 149       finished_span_dynamic_->render ();
 150       finished_span_dynamic_ = 0;
 151     }
 152
 153   if (absolute_ && absolute_->volume_ < 0)
 154     {
 155       absolute_->volume_ = last_volume_;
 156     }
 157   else if (absolute_)
 158     {
 159       last_volume_ = absolute_->volume_;
 160     }
 161
 162   absolute_ = 0;
 163   script_event_ = 0;
 164   span_events_[LEFT] =
 165     span_events_[RIGHT] = 0;
 166 }
 167
 168 IMPLEMENT_TRANSLATOR_LISTENER (Dynamic_performer, decrescendo);
 169 void
 170 Dynamic_performer::listen_decrescendo (Stream_event *r)
 171 {
 172   Direction d = to_dir (r->get_property ("span-direction"));
 173   span_events_[d] = r;
 174   grow_dir_[d] = SMALLER;
 175 }
 176
 177 IMPLEMENT_TRANSLATOR_LISTENER (Dynamic_performer, crescendo);
 178 void
 179 Dynamic_performer::listen_crescendo (Stream_event *r)
 180 {
 181   Direction d = to_dir (r->get_property ("span-direction"));
 182   span_events_[d] = r;
 183   grow_dir_[d] = BIGGER;
 184 }
 185
 186 IMPLEMENT_TRANSLATOR_LISTENER (Dynamic_performer, absolute_dynamic);
 187 void
 188 Dynamic_performer::listen_absolute_dynamic (Stream_event *r)
 189 {
 190   if (!script_event_)
 191     script_event_ = r;
 192 }
 193
 194 ADD_TRANSLATOR (Dynamic_performer,
 195                 /* doc */
 196                 "",
 197
 198                 /* create */
 199                 "",
 200
 201                 /* read */
 202                 "dynamicAbsoluteVolumeFunction "
 203                 "instrumentEqualizer "
 204                 "midiMaximumVolume "
 205                 "midiMinimumVolume "
 206                 "midiInstrument ",
 207
 208                 /* write */
 209                 ""
 210                 );