lily/audio-item.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1997--2011 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 "audio-item.hh"
  21
  22 #include "midi-item.hh"
  23 #include "audio-column.hh"
  24
  25 Audio_instrument::Audio_instrument (string instrument_string)
  26 {
  27   str_ = instrument_string;
  28 }
  29
  30 void
  31 Audio_item::render ()
  32 {
  33 }
  34
  35 Audio_column *
  36 Audio_item::get_column () const
  37 {
  38   return audio_column_;
  39 }
  40
  41 Audio_item::Audio_item ()
  42 {
  43   audio_column_ = 0;
  44 }
  45
  46 Audio_note::Audio_note (Pitch p, Moment m, bool tie_event, Pitch transposing)
  47 {
  48   pitch_ = p;
  49   length_mom_ = m;
  50   tied_ = 0;
  51   transposing_ = transposing;
  52   tie_event_ = tie_event;
  53 }
  54
  55 void
  56 Audio_note::tie_to (Audio_note *t, Moment skip)
  57 {
  58   tied_ = t;
  59   Audio_note *first = t;
  60   while (first->tied_)
  61     first = first->tied_;
  62   // Add the skip to the tied note and the length of the appended note
  63   // to the full duration of the tie...
  64   first->length_mom_ += skip + length_mom_;
  65   length_mom_ = 0;
  66 }
  67
  68 Audio_key::Audio_key (int acc, bool major)
  69 {
  70   accidentals_ = acc;
  71   major_ = major;
  72 }
  73
  74 Audio_dynamic::Audio_dynamic ()
  75 {
  76   volume_ = -1;
  77 }
  78
  79 Audio_span_dynamic::Audio_span_dynamic ()
  80 {
  81   grow_dir_ = CENTER;
  82 }
  83
  84 void
  85 Audio_span_dynamic::add_absolute (Audio_dynamic *d)
  86 {
  87   assert (d);
  88   dynamics_.push_back (d);
  89 }
  90
  91 Moment
  92 remap_grace_duration (Moment m)
  93 {
  94   return Moment (m.main_part_ + Rational (9,40) * m.grace_part_,
  95                  Rational (0));
  96 }
  97
  98 Real
  99 moment_to_real (Moment m)
 100 {
 101   return remap_grace_duration (m).main_part_.to_double ();
 102 }
 103
 104 int
 105 moment_to_ticks (Moment m)
 106 {
 107   return int (moment_to_real (m) * 384 * 4);
 108 }
 109
 110 void
 111 Audio_span_dynamic::render ()
 112 {
 113   if (dynamics_.size () <= 1)
 114     return ;
 115
 116   assert (dynamics_[0]->volume_ >= 0);
 117
 118   while  (dynamics_.back ()->volume_ > 0
 119           && dynamics_.size () > 1
 120           && sign (dynamics_.back ()->volume_ - dynamics_[0]->volume_) != grow_dir_)
 121     {
 122       dynamics_.erase (dynamics_.end () - 1);
 123     }
 124
 125   if (dynamics_.size () <= 1)
 126     {
 127       programming_error ("Impossible or ambiguous (de)crescendo in MIDI.");
 128       return ;
 129     }
 130
 131   Real delta_v = grow_dir_ * 0.1;
 132
 133   Real start_v = dynamics_[0]->volume_;
 134   if (dynamics_.back ()->volume_ < 0)
 135     dynamics_.back ()->volume_ = max (min (start_v + grow_dir_ * 0.25, 1.0), 0.1);
 136
 137   delta_v = dynamics_.back ()->volume_ - dynamics_[0]->volume_;
 138
 139   Moment start = dynamics_[0]->get_column ()->when ();
 140
 141   Real total_t = moment_to_real (dynamics_.back ()->get_column ()->when () - start);
 142
 143   for (vsize i = 1; i < dynamics_.size (); i ++)
 144     {
 145       Moment dt_moment = dynamics_[i]->get_column ()->when ()
 146         - start;
 147
 148       Real dt =  moment_to_real (dt_moment);
 149
 150       Real v = start_v + delta_v *  (dt / total_t);
 151
 152       dynamics_[i]->volume_ = v;
 153     }
 154 }
 155
 156
 157
 158 Audio_tempo::Audio_tempo (int per_minute_4)
 159 {
 160   per_minute_4_ = per_minute_4;
 161 }
 162
 163 Audio_time_signature::Audio_time_signature (int beats, int one_beat)
 164 {
 165   beats_ = beats;
 166   one_beat_ = one_beat;
 167 }
 168
 169 Audio_text::Audio_text (Audio_text::Type type, string text_string)
 170 {
 171   text_string_ = text_string;
 172   type_ = type;
 173 }
 174