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>
10 Ideally this should also use a register system, to process slurs,
15 #include "command-request.hh"
16 #include "musical-request.hh"
19 #include "midi-walker.hh"
20 #include "midi-item.hh"
21 #include "midi-stream.hh"
23 #include "staff-column.hh"
25 Midi_walker::Midi_walker(Staff *st_l, Midi_track* track_l)
26 : PCursor<Staff_column*>(st_l->cols_)
33 output notestop events for all notes which end before #max_moment#
36 Midi_walker::do_stop_notes(Moment max_moment)
38 while (stop_notes.size() && stop_notes.front().key <= max_moment) {
39 Note_event ent=stop_notes.get();
43 Moment stop_moment = ent.key;
44 Melodic_req * req_l = ent.val;
46 Midi_note note(req_l, track_l_->number_i_, false);
47 output_event(note, stop_moment);
51 Find out if start_note event is needed, and do it if needed.
54 Midi_walker::do_start_note(Note_req*note_l)
56 Moment stop = note_l->duration() + ptr()->when();
57 for(int i=0; i < stop_notes.size(); i++) {
58 if (stop_notes[i].val->melodic()->pitch() ==
60 if ( stop_notes[i].key < stop){
61 stop_notes[i].ignore_b_=true;
64 return; // skip the stop note
73 Midi_note note(note_l, track_l_->number_i_, true);
74 output_event(note, ptr()->when());
78 /** advance the track to #now#, output the item, and adjust current
81 Midi_walker::output_event(Midi_item &i, Moment now)
83 Moment delta_t = now - last_moment_ ;
84 last_moment_ += delta_t;
85 track_l_->add(delta_t, &i );
89 Midi_walker::process_requests()
91 do_stop_notes(ptr()->when());
93 for ( int i = 0; i < ptr()->commandreq_l_arr_.size(); i++ ) {
94 Command_req *c_l = ptr()->commandreq_l_arr_[i]->command();
95 Meter_change_req* meter_l = c_l->meterchange();
97 output_event( Midi_time( meter_l->beats_i_, meter_l->one_beat_i_, 18 ), ptr()->when() );
98 Key_change_req* key_l = c_l->keychange();
100 int sharps_i = key_l->sharps_i();
101 int flats_i = key_l->flats_i();
102 // midi cannot handle non-conventional keys
103 if ( !( flats_i && sharps_i ) )
104 output_event( Midi_key( sharps_i - flats_i, key_l->minor_b() ), ptr()->when() );
108 for ( int i = 0; i < ptr()->musicalreq_l_arr_.size(); i++ ) {
109 Rhythmic_req *n = ptr()->musicalreq_l_arr_[i]->rhythmic();
112 Note_req * note_l = n->note();
115 do_start_note(note_l);
119 Midi_walker::~Midi_walker()
121 do_stop_notes( last_moment_ + Moment(10,1)); // ugh
126 compare(Note_event const&e1, Note_event const&e2)
128 return sign(e1.key - e2.key);