lily/audio-item.cc

   1 /*
   2   audio-item.cc -- implement Audio items.
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1997--2009 Jan Nieuwenhuizen <janneke@gnu.org>
   7 */
   8
   9 #include "audio-item.hh"
  10
  11 #include "midi-item.hh"
  12 #include "audio-column.hh"
  13
  14 Audio_instrument::Audio_instrument (string instrument_string)
  15 {
  16   str_ = instrument_string;
  17 }
  18
  19 void
  20 Audio_item::render ()
  21 {
  22 }
  23
  24 Audio_column *
  25 Audio_item::get_column () const
  26 {
  27   return audio_column_;
  28 }
  29
  30 Audio_item::Audio_item ()
  31 {
  32   audio_column_ = 0;
  33 }
  34
  35 Audio_note::Audio_note (Pitch p, Moment m, bool tie_event, Pitch transposing)
  36 {
  37   pitch_ = p;
  38   length_mom_ = m;
  39   tied_ = 0;
  40   transposing_ = transposing;
  41   tie_event_ = tie_event;
  42 }
  43
  44 void
  45 Audio_note::tie_to (Audio_note *t, Moment skip)
  46 {
  47   tied_ = t;
  48   Audio_note *first = t;
  49   while (first->tied_)
  50     first = first->tied_;
  51   // Add the skip to the tied note and the length of the appended note
  52   // to the full duration of the tie...
  53   first->length_mom_ += skip + length_mom_;
  54   length_mom_ = 0;
  55 }
  56
  57 Audio_key::Audio_key (int acc, bool major)
  58 {
  59   accidentals_ = acc;
  60   major_ = major;
  61 }
  62
  63 Audio_dynamic::Audio_dynamic ()
  64 {
  65   volume_ = -1;
  66 }
  67
  68 Audio_span_dynamic::Audio_span_dynamic ()
  69 {
  70   grow_dir_ = CENTER;
  71 }
  72
  73 void
  74 Audio_span_dynamic::add_absolute (Audio_dynamic *d)
  75 {
  76   assert (d);
  77   dynamics_.push_back (d);
  78 }
  79
  80 Moment
  81 remap_grace_duration (Moment m)
  82 {
  83   return Moment (m.main_part_ + Rational (9,40) * m.grace_part_,
  84                  Rational (0));
  85 }
  86
  87 Real
  88 moment_to_real (Moment m)
  89 {
  90   return remap_grace_duration (m).main_part_.to_double ();
  91 }
  92
  93 int
  94 moment_to_ticks (Moment m)
  95 {
  96   return int (moment_to_real (m) * 384 * 4);
  97 }
  98
  99 void
 100 Audio_span_dynamic::render ()
 101 {
 102   if (dynamics_.size () <= 1)
 103     return ;
 104
 105   assert (dynamics_[0]->volume_ >= 0);
 106
 107   while  (dynamics_.back ()->volume_ > 0
 108           && dynamics_.size () > 1
 109           && sign (dynamics_.back ()->volume_ - dynamics_[0]->volume_) != grow_dir_)
 110     {
 111       dynamics_.erase (dynamics_.end () - 1);
 112     }
 113
 114   if (dynamics_.size () <= 1)
 115     {
 116       programming_error ("(de)crescendo on items with specified volume.");
 117       return ;
 118     }
 119
 120   Real delta_v = grow_dir_ * 0.1;
 121
 122   Real start_v = dynamics_[0]->volume_;
 123   if (dynamics_.back ()->volume_ < 0)
 124     dynamics_.back ()->volume_ = max (min (start_v + grow_dir_ * 0.25, 1.0), 0.1);
 125
 126   delta_v = dynamics_.back ()->volume_ - dynamics_[0]->volume_;
 127
 128   Moment start = dynamics_[0]->get_column ()->when ();
 129
 130   Real total_t = moment_to_real (dynamics_.back ()->get_column ()->when () - start);
 131
 132   for (vsize i = 1; i < dynamics_.size (); i ++)
 133     {
 134       Moment dt_moment = dynamics_[i]->get_column ()->when ()
 135         - start;
 136
 137       Real dt =  moment_to_real (dt_moment);
 138
 139       Real v = start_v + delta_v *  (dt / total_t);
 140
 141       dynamics_[i]->volume_ = v;
 142     }
 143 }
 144
 145
 146
 147 Audio_tempo::Audio_tempo (int per_minute_4)
 148 {
 149   per_minute_4_ = per_minute_4;
 150 }
 151
 152 Audio_time_signature::Audio_time_signature (int beats, int one_beat)
 153 {
 154   beats_ = beats;
 155   one_beat_ = one_beat;
 156 }
 157
 158 Audio_text::Audio_text (Audio_text::Type type, string text_string)
 159 {
 160   text_string_ = text_string;
 161   type_ = type;
 162 }
 163