2 midi-walker.cc -- implement Midi_walker
4 source file of the LilyPond music typesetter
6 (c) 1997 Han-Wen Nienhuys <hanwen@stack.nl>, Jan Nieuwenhuizen <jan@digicash.com>
9 #include "command-request.hh"
10 #include "musical-request.hh"
13 #include "midi-walker.hh"
14 #include "midi-item.hh"
15 #include "midi-stream.hh"
17 #include "staff-column.hh"
19 Midi_walker::Midi_walker(Staff *st_l, Midi_track* track_l)
20 : PCursor<Staff_column*>(st_l->cols_)
27 output notestop events for all notes which end before #max_moment#
30 Midi_walker::do_stop_notes(Moment max_moment)
32 while (stop_notes.size() && stop_notes.front().key <= max_moment) {
33 Note_event ent=stop_notes.get();
37 Moment stop_moment = ent.key;
38 Melodic_req * req_l = ent.val;
40 Midi_note note(req_l, track_l_->number_i_, false);
41 output_event(note, stop_moment);
45 Find out if start_note event is needed, and do it if needed.
48 Midi_walker::do_start_note(Note_req*note_l)
50 Moment stop = note_l->duration() + ptr()->when();
51 for(int i=0; i < stop_notes.size(); i++) {
52 if (stop_notes[i].val->melodic()->pitch() ==
54 if ( stop_notes[i].key < stop){
55 stop_notes[i].ignore_b_=true;
58 return; // skip the stop note
67 Midi_note note(note_l, track_l_->number_i_, true);
68 output_event(note, ptr()->when());
72 /** advance the track to #now#, output the item, and adjust current
75 Midi_walker::output_event(Midi_item &i, Moment now)
77 Moment delta_t = now - last_moment_ ;
78 last_moment_ += delta_t;
79 track_l_->add(delta_t, &i );
83 Midi_walker::process_requests()
85 do_stop_notes(ptr()->when());
87 for ( int i = 0; i < ptr()->commandreq_l_arr_.size(); i++ ) {
88 Command_req *c_l = ptr()->commandreq_l_arr_[i]->command();
89 Meter_change_req* meter_l = c_l->meterchange();
91 output_event( Midi_time( meter_l->beats_i_, meter_l->one_beat_i_, 18 ), 0 );
92 Key_change_req* key_l = c_l->keychange();
94 int sharps_i = key_l->sharps_i();
95 int flats_i = key_l->flats_i();
96 // midi cannot handle non-conventional keys
97 if ( !( flats_i && sharps_i ) )
98 output_event( Midi_key( sharps_i - flats_i, key_l->minor_b() ), 0 );
102 for ( int i = 0; i < ptr()->musicalreq_l_arr_.size(); i++ ) {
103 Rhythmic_req *n = ptr()->musicalreq_l_arr_[i]->rhythmic();
106 Note_req * note_l = n->note();
109 do_start_note(note_l);
113 Midi_walker::~Midi_walker()
115 do_stop_notes( last_moment_ + Moment(10,1)); // ugh
120 compare(Note_event const&e1, Note_event const&e2)
122 return sign(e1.key - e2.key);