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 do_stop_notes (last_tick_ + 384);
60 Find out if start_note event is needed, and do it if needed.
63 Midi_walker::do_start_note (Midi_note *note)
65 Audio_item *ptr = items_[index_];
66 int stop_ticks = int (moment_to_real (note->audio_->length_mom_) * Real (384 * 4))
67 + ptr->audio_column_->ticks ();
69 bool play_start = true;
70 for (vsize i = 0; i < stop_note_queue.size (); i++)
72 /* if this pith already in queue */
73 if (stop_note_queue[i].val->get_semitone_pitch ()
74 == note->get_semitone_pitch ())
76 if (stop_note_queue[i].key < stop_ticks)
78 /* let stopnote in queue be ignored,
80 stop_note_queue[i].ignore_b_ = true;
81 /* don't replay start note, */
87 /* skip this stopnote,
88 don't play the start note */
99 e.val = new Midi_note_off (note);
100 e.key = int (stop_ticks);
101 stop_note_queue.insert (e);
104 output_event (ptr->audio_column_->ticks (), note);
109 Output note events for all notes which end before #max_mom#
112 Midi_walker::do_stop_notes (int max_ticks)
114 while (stop_note_queue.size () && stop_note_queue.front ().key <= max_ticks)
116 Midi_note_event e = stop_note_queue.get ();
123 int stop_ticks = e.key;
124 Midi_note *note = e.val;
126 output_event (stop_ticks, note);
131 Advance the track to #now#, output the item, and adjust current "moment".
134 Midi_walker::output_event (int now_ticks, Midi_item *l)
136 int delta_ticks = now_ticks - last_tick_;
137 last_tick_ = now_ticks;
140 this is not correct, but at least it doesn't crash when you
145 programming_error ("Going back in MIDI time.");
149 track_->add (delta_ticks, l);
153 Midi_walker::process ()
155 Audio_item *audio = items_[index_];
156 do_stop_notes (audio->audio_column_->ticks ());
158 if (Midi_item *midi = Midi_item::get_midi (audio))
160 if (Midi_channel_item *mci = dynamic_cast<Midi_channel_item*> (midi))
161 mci->channel_ = channel_;
163 //midi->channel_ = track_->number_;
164 if (Midi_note *note = dynamic_cast<Midi_note *> (midi))
166 if (note->audio_->length_mom_.to_bool ())
167 do_start_note (note);
170 output_event (audio->audio_column_->ticks (), midi);
175 Midi_walker::ok () const
177 return index_ < items_.size ();
181 Midi_walker::operator ++ (int)