2 midi-walker.cc -- implement Midi_walker
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
7 Jan Nieuwenhuizen <janneke@gnu.org>
10 #include "midi-walker.hh"
12 #include "audio-column.hh"
13 #include "audio-staff.hh"
14 #include "midi-item.hh"
15 #include "midi-stream.hh"
18 Midi_note_event::Midi_note_event ()
24 compare (Midi_note_event const &left, Midi_note_event const &right)
26 Moment m = (left.key - right.key);
37 audio_item_less (Audio_item * const a,
40 return a->get_column ()->when_ < b->get_column ()->when_;
43 Midi_walker::Midi_walker (Audio_staff *audio_staff, Midi_track *track,
49 items_ = audio_staff->audio_items_;
50 vector_sort (items_, audio_item_less);
54 Midi_walker::~Midi_walker ()
56 junk_pointers (midi_events_);
60 Midi_walker::finalize ()
62 do_stop_notes (INT_MAX);
66 Find out if start_note event is needed, and do it if needed.
69 Midi_walker::do_start_note (Midi_note *note)
71 Audio_item *ptr = items_[index_];
72 int stop_ticks = int (moment_to_real (note->audio_->length_mom_) * Real (384 * 4))
73 + ptr->audio_column_->ticks ();
75 bool play_start = true;
76 for (vsize i = 0; i < stop_note_queue.size (); i++)
78 /* if this pith already in queue */
79 if (stop_note_queue[i].val->get_semitone_pitch ()
80 == note->get_semitone_pitch ())
82 if (stop_note_queue[i].key < stop_ticks)
84 /* let stopnote in queue be ignored,
86 stop_note_queue[i].ignore_ = true;
88 /* don't replay start note, */
94 /* skip this stopnote,
95 don't play the start note */
105 e.val = new Midi_note_off (note);
107 midi_events_.push_back (e.val);
108 e.key = int (stop_ticks);
109 stop_note_queue.insert (e);
112 output_event (ptr->audio_column_->ticks (), note);
117 Output note events for all notes which end before #max_mom#
120 Midi_walker::do_stop_notes (int max_ticks)
122 while (stop_note_queue.size () && stop_note_queue.front ().key <= max_ticks)
124 Midi_note_event e = stop_note_queue.get ();
130 int stop_ticks = e.key;
131 Midi_note *note = e.val;
133 output_event (stop_ticks, note);
138 Midi_walker::output_event (int now_ticks, Midi_item *l)
140 int delta_ticks = now_ticks - last_tick_;
141 last_tick_ = now_ticks;
144 this is not correct, but at least it doesn't crash when you
149 programming_error ("Going back in MIDI time.");
153 track_->add (delta_ticks, l);
157 Midi_walker::process ()
159 Audio_item *audio = items_[index_];
160 do_stop_notes (audio->audio_column_->ticks ());
162 if (Midi_item *midi = get_midi (audio))
164 if (Midi_channel_item *mci = dynamic_cast<Midi_channel_item*> (midi))
165 mci->channel_ = channel_;
167 if (Midi_note *note = dynamic_cast<Midi_note *> (midi))
169 if (note->audio_->length_mom_.to_bool ())
170 do_start_note (note);
173 output_event (audio->audio_column_->ticks (), midi);
178 Midi_walker::get_midi (Audio_item *i)
180 Midi_item *mi = Midi_item::get_midi (i);
181 midi_events_.push_back (mi);
186 Midi_walker::ok () const
188 return index_ < items_.size ();
192 Midi_walker::operator ++ (int)