2 audio-item.cc -- implement Audio items.
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2006 Jan Nieuwenhuizen <janneke@gnu.org>
9 #include "audio-item.hh"
11 #include "midi-item.hh"
12 #include "audio-column.hh"
14 Audio_instrument::Audio_instrument (string instrument_string)
16 str_ = instrument_string;
25 Audio_item::get_column () const
30 Audio_item::Audio_item ()
35 Audio_note::Audio_note (Pitch p, Moment m, bool tie_event, Pitch transposing)
40 transposing_ = transposing;
41 tie_event_ = tie_event;
45 Audio_note::tie_to (Audio_note *t)
48 Audio_note *first = t;
51 first->length_mom_ += length_mom_;
55 Audio_key::Audio_key (int acc, bool major)
61 Audio_dynamic::Audio_dynamic ()
66 Audio_span_dynamic::Audio_span_dynamic ()
72 Audio_span_dynamic::add_absolute (Audio_dynamic *d)
75 dynamics_.push_back (d);
79 moment2real (Moment m)
81 return m.main_part_.to_double ()
82 + 0.1 * m.grace_part_.to_double ();
86 Audio_span_dynamic::render ()
88 if (dynamics_.size () <= 1)
91 assert (dynamics_[0]->volume_ >= 0);
93 while (dynamics_.back ()->volume_ > 0
94 && dynamics_.size () > 1
95 && sign (dynamics_.back ()->volume_ - dynamics_[0]->volume_) != grow_dir_)
97 dynamics_.erase (dynamics_.end () - 1);
100 if (dynamics_.size () <= 1)
102 programming_error ("(de)crescendo on items with specified volume.");
106 Real delta_v = grow_dir_ * 0.1;
108 Real start_v = dynamics_[0]->volume_;
109 if (dynamics_.back ()->volume_ < 0)
110 dynamics_.back ()->volume_ = max (min (start_v + grow_dir_ * 0.25, 1.0), 0.0);
112 delta_v = dynamics_.back ()->volume_ - dynamics_[0]->volume_;
114 Moment start = dynamics_[0]->get_column ()->when ();
116 Real total_t = moment2real (dynamics_.back ()->get_column ()->when () - start);
118 for (vsize i = 1; i < dynamics_.size(); i ++)
120 Moment dt_moment = dynamics_[i]->get_column ()->when ()
123 Real dt = moment2real (dt_moment);
125 Real v = start_v + delta_v * (dt / total_t);
127 dynamics_[i]->volume_ = v;
133 Audio_tempo::Audio_tempo (int per_minute_4)
135 per_minute_4_ = per_minute_4;
138 Audio_time_signature::Audio_time_signature (int beats, int one_beat)
141 one_beat_ = one_beat;
144 Audio_text::Audio_text (Audio_text::Type type, string text_string)
146 text_string_ = text_string;