2 midi-walker.cc -- implement Midi_walker
4 source file of the GNU LilyPond music typesetter
6 (c) 1997 Han-Wen Nienhuys <hanwen@stack.nl>, Jan Nieuwenhuizen <jan@digicash.com>
10 Ideally this should also use a register system, to process slurs,
15 #include "command-request.hh"
16 #include "musical-request.hh"
18 #include "midi-walker.hh"
19 #include "midi-item.hh"
20 #include "midi-stream.hh"
23 Midi_walker::Midi_walker(Staff *st_l, Midi_track* track_l)
24 : PCursor<Staff_column*>(st_l->cols_)
31 output notestop events for all notes which end before #max_moment#
34 Midi_walker::do_stop_notes(Moment max_moment)
36 while (stop_notes.size() && stop_notes.front().key <= max_moment) {
37 Note_event ent=stop_notes.get();
41 Moment stop_moment = ent.key;
42 Melodic_req * req_l = ent.val;
44 Midi_note note(req_l, track_l_->number_i_, false);
45 output_event(note, stop_moment);
49 Find out if start_note event is needed, and do it if needed.
52 Midi_walker::do_start_note(Note_req*note_l)
54 Moment stop = note_l->duration() + ptr()->when();
55 for(int i=0; i < stop_notes.size(); i++) {
56 if (stop_notes[i].val->melodic()->pitch() ==
58 if ( stop_notes[i].key < stop){
59 stop_notes[i].ignore_b_=true;
62 return; // skip the stop note
71 Midi_note note(note_l, track_l_->number_i_, true);
72 output_event(note, ptr()->when());
76 /** advance the track to #now#, output the item, and adjust current
79 Midi_walker::output_event(Midi_item &i, Moment now)
81 Moment delta_t = now - last_moment_ ;
82 last_moment_ += delta_t;
83 track_l_->add(delta_t, &i );
87 Midi_walker::do_process_requests()
89 do_stop_notes(ptr()->when());
91 for ( int i = 0; i < ptr()->commandreq_l_arr_.size(); i++ ) {
92 Command_req *c_l = ptr()->commandreq_l_arr_[i]->command();
93 Meter_change_req* meter_l = c_l->meterchange();
95 output_event( Midi_time( meter_l->beats_i_, meter_l->one_beat_i_, 18 ), ptr()->when() );
96 Key_change_req* key_l = c_l->keychange();
98 int sharps_i = key_l->sharps_i();
99 int flats_i = key_l->flats_i();
100 // midi cannot handle non-conventional keys
101 if ( !( flats_i && sharps_i ) )
102 output_event( Midi_key( sharps_i - flats_i, key_l->minor_b() ), ptr()->when() );
106 for ( int i = 0; i < ptr()->musicalreq_l_arr_.size(); i++ ) {
107 Musical_req *m = ptr()->musicalreq_l_arr_[i]->musical();
110 Rhythmic_req *n = m->rhythmic();
113 Note_req * note_l = n->note();
116 do_start_note(note_l);
120 Midi_walker::~Midi_walker()
122 do_stop_notes( last_moment_ + Moment(10,1)); // ugh
127 compare(Note_event const&e1, Note_event const&e2)
129 return sign(e1.key - e2.key);