lily/dynamic-performer.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2000--2010 Jan Nieuwenhuizen <janneke@gnu.org>
   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 #include "audio-item.hh"
  22 #include "stream-event.hh"
  23
  24 #include "translator.icc"
  25
  26 class Dynamic_performer : public Performer
  27 {
  28 public:
  29   TRANSLATOR_DECLARATIONS (Dynamic_performer);
  30 protected:
  31   void stop_translation_timestep ();
  32   void process_music ();
  33   Real equalize_volume (Real);
  34
  35   DECLARE_TRANSLATOR_LISTENER (decrescendo);
  36   DECLARE_TRANSLATOR_LISTENER (crescendo);
  37   DECLARE_TRANSLATOR_LISTENER (absolute_dynamic);
  38 private:
  39   Stream_event *script_event_;
  40   Drul_array<Stream_event*> span_events_;
  41   Drul_array<Direction> grow_dir_;
  42   Real last_volume_;
  43   Audio_dynamic *absolute_;
  44   Audio_span_dynamic *span_dynamic_;
  45   Audio_span_dynamic *finished_span_dynamic_;
  46 };
  47
  48 Dynamic_performer::Dynamic_performer ()
  49 {
  50   last_volume_ = 0.5;
  51   script_event_ = 0;
  52   absolute_ = 0;
  53   span_events_[LEFT] =
  54     span_events_[RIGHT] = 0;
  55   span_dynamic_ = 0;
  56   finished_span_dynamic_ = 0;
  57 }
  58
  59 Real
  60 Dynamic_performer::equalize_volume (Real volume)
  61 {
  62   /*
  63     properties override default equaliser setting
  64   */
  65   SCM min = get_property ("midiMinimumVolume");
  66   SCM max = get_property ("midiMaximumVolume");
  67   if (scm_is_number (min) || scm_is_number (max))
  68     {
  69       Interval iv (0, 1);
  70       if (scm_is_number (min))
  71         iv[MIN] = scm_to_double (min);
  72       if (scm_is_number (max))
  73         iv[MAX] = scm_to_double (max);
  74       volume = iv[MIN] + iv.length () * volume;
  75     }
  76   else
  77     {
  78       /*
  79         urg, code duplication:: staff_performer
  80       */
  81       SCM s = get_property ("midiInstrument");
  82
  83       if (!scm_is_string (s))
  84         s = get_property ("instrumentName");
  85
  86       if (!scm_is_string (s))
  87         s = scm_from_locale_string ("piano");
  88
  89       SCM eq = get_property ("instrumentEqualizer");
  90       if (ly_is_procedure (eq))
  91         s = scm_call_1 (eq, s);
  92
  93       if (is_number_pair (s))
  94         {
  95           Interval iv = ly_scm2interval (s);
  96           volume = iv[MIN] + iv.length () * volume;
  97         }
  98     }
  99   return volume;
 100 }
 101
 102
 103 void
 104 Dynamic_performer::process_music ()
 105 {
 106   if (span_events_[STOP] || script_event_)
 107     {
 108       finished_span_dynamic_ = span_dynamic_;
 109       span_dynamic_ = 0;
 110     }
 111
 112   if (span_events_[START])
 113     {
 114       span_dynamic_ = new Audio_span_dynamic ();
 115       announce_element (Audio_element_info (span_dynamic_, span_events_[START]));
 116
 117       span_dynamic_->grow_dir_ = grow_dir_[START];
 118     }
 119
 120   if (script_event_
 121       || span_dynamic_
 122       || finished_span_dynamic_)
 123     {
 124       absolute_ = new Audio_dynamic ();
 125
 126       if (script_event_)
 127         {
 128           SCM proc = get_property ("dynamicAbsoluteVolumeFunction");
 129
 130           SCM svolume = SCM_EOL;
 131           if (ly_is_procedure (proc))
 132             {
 133               // urg
 134               svolume = scm_call_1 (proc, script_event_->get_property ("text"));
 135             }
 136
 137           Real volume = robust_scm2double (svolume, 0.5);
 138
 139           last_volume_
 140             = absolute_->volume_ = equalize_volume (volume);
 141         }
 142
 143       Audio_element_info info (absolute_, script_event_);
 144       announce_element (info);
 145     }
 146
 147
 148   if (span_dynamic_)
 149     span_dynamic_->add_absolute (absolute_);
 150
 151   if (finished_span_dynamic_)
 152     finished_span_dynamic_->add_absolute (absolute_);
 153 }
 154
 155 void
 156 Dynamic_performer::stop_translation_timestep ()
 157 {
 158   if (finished_span_dynamic_)
 159     {
 160       finished_span_dynamic_->render ();
 161       finished_span_dynamic_ = 0;
 162     }
 163
 164   if (absolute_ && absolute_->volume_ < 0)
 165     {
 166       absolute_->volume_ = last_volume_;
 167     }
 168   else if (absolute_)
 169     {
 170       last_volume_ = absolute_->volume_;
 171     }
 172
 173   absolute_ = 0;
 174   script_event_ = 0;
 175   span_events_[LEFT] =
 176     span_events_[RIGHT] = 0;
 177 }
 178
 179 IMPLEMENT_TRANSLATOR_LISTENER (Dynamic_performer, decrescendo);
 180 void
 181 Dynamic_performer::listen_decrescendo (Stream_event *r)
 182 {
 183   Direction d = to_dir (r->get_property ("span-direction"));
 184   span_events_[d] = r;
 185   grow_dir_[d] = SMALLER;
 186 }
 187
 188 IMPLEMENT_TRANSLATOR_LISTENER (Dynamic_performer, crescendo);
 189 void
 190 Dynamic_performer::listen_crescendo (Stream_event *r)
 191 {
 192   Direction d = to_dir (r->get_property ("span-direction"));
 193   span_events_[d] = r;
 194   grow_dir_[d] = BIGGER;
 195 }
 196
 197 IMPLEMENT_TRANSLATOR_LISTENER (Dynamic_performer, absolute_dynamic);
 198 void
 199 Dynamic_performer::listen_absolute_dynamic (Stream_event *r)
 200 {
 201   if (!script_event_)
 202     script_event_ = r;
 203 }
 204
 205 ADD_TRANSLATOR (Dynamic_performer,
 206                 /* doc */
 207                 "",
 208
 209                 /* create */
 210                 "",
 211
 212                 /* read */
 213                 "dynamicAbsoluteVolumeFunction "
 214                 "instrumentEqualizer "
 215                 "midiMaximumVolume "
 216                 "midiMinimumVolume "
 217                 "midiInstrument ",
 218
 219                 /* write */
 220                 ""
 221                 );