2 midi-walker.cc -- implement Midi_walker
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
7 Jan Nieuwenhuizen <janneke@gnu.org>
10 #include "midi-walker.hh"
11 #include "audio-column.hh"
12 #include "audio-item.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 return sign (left.key - right.key);
29 Midi_walker::Midi_walker (Audio_staff* audio_staff_l, Midi_track* track_l)
33 item_l_arr_l_ = &audio_staff_l->audio_item_l_arr_;
38 Midi_walker::~Midi_walker ()
41 do_stop_notes (last_mom_ + Moment (10, 1));
45 Find out if start_note event is needed, and do it if needed.
48 Midi_walker::do_start_note (Midi_note* note_p)
50 Audio_item* ptr = (*item_l_arr_l_)[index_];
51 Moment stop_mom = note_p->length_mom () + ptr->audio_column_l_->at_mom ();
53 bool play_start = true;
54 for (int i=0; i < stop_note_queue.size (); i++)
56 /* if this pith already in queue */
57 if (stop_note_queue[i].val->pitch_i () == note_p->pitch_i ())
59 if (stop_note_queue[i].key < stop_mom)
61 /* let stopnote in queue be ignored,
63 stop_note_queue[i].ignore_b_ = true;
64 /* don't replay start note, */
70 /* skip this stopnote,
71 don't play the start note */
82 e.val = new Midi_note_off (note_p);
84 stop_note_queue.insert (e);
87 output_event (ptr->audio_column_l_->at_mom (), note_p);
92 Output note events for all notes which end before #max_mom#
95 Midi_walker::do_stop_notes (Moment max_mom)
97 while (stop_note_queue.size () && stop_note_queue.front ().key <= max_mom)
99 Midi_note_event e = stop_note_queue.get ();
106 Moment stop_mom = e.key;
107 Midi_note* note_p = e.val;
109 output_event (stop_mom, note_p);
114 Advance the track to #now#, output the item, and adjust current "moment".
117 Midi_walker::output_event (Moment now_mom, Midi_item* l)
119 Moment delta_t = now_mom - last_mom_ ;
123 this is not correct, but at least it doesn't crash when you
126 if (delta_t < Moment(0))
128 delta_t = Moment (0);
132 track_l_->add (delta_t, l);
136 Midi_walker::process ()
138 Audio_item* audio_p = (*item_l_arr_l_)[index_];
139 do_stop_notes (audio_p->audio_column_l_->at_mom ());
141 if (Midi_item* midi_p = Midi_item::midi_p (audio_p))
143 midi_p->channel_i_ = track_l_->channel_i_;
144 //midi_p->channel_i_ = track_l_->number_i_;
145 if (Midi_note* note_p = dynamic_cast<Midi_note*> (midi_p))
147 if (note_p->length_mom ())
148 do_start_note (note_p);
151 output_event (audio_p->audio_column_l_->at_mom (), midi_p);
156 Midi_walker::ok () const
158 return index_ <item_l_arr_l_->size ();
162 Midi_walker::operator ++ (int)