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>
7 Jan Nieuwenhuizen <jan@digicash.com>
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 )
30 : PCursor<Audio_item*>( audio_staff_l->audio_item_l_list_ )
36 Midi_walker::~Midi_walker()
39 do_stop_notes( last_mom_ + Moment( 10, 1 ) );
43 Find out if start_note event is needed, and do it if needed.
46 Midi_walker::do_start_note( Midi_note* note_l )
48 Moment stop_mom = note_l->duration() + ptr()->audio_column_l_->at_mom();
49 for ( int i=0; i < stop_note_queue.size(); i++ ) {
50 if ( stop_note_queue[ i ].val->pitch_i() == note_l->pitch_i() ) {
51 if ( stop_note_queue[ i ].key < stop_mom )
52 stop_note_queue[ i ].ignore_b_ = true;
53 else // skip the stopnote
59 e.val = new Midi_note_off( note_l );
61 stop_note_queue.insert( e );
63 output_event( ptr()->audio_column_l_->at_mom(), note_l );
67 Output note events for all notes which end before #max_mom#
70 Midi_walker::do_stop_notes( Moment max_mom )
72 while ( stop_note_queue.size() && stop_note_queue.front().key <= max_mom ) {
73 Midi_note_event e = stop_note_queue.get();
77 Moment stop_mom = e.key;
78 Midi_note_off* note_l = e.val;
80 output_event( stop_mom, note_l );
85 Advance the track to #now#, output the item, and adjust current "moment".
88 Midi_walker::output_event( Moment now_mom, Midi_item* l )
90 Moment delta_t = now_mom - last_mom_ ;
92 track_l_->add( delta_t, l );
96 Midi_walker::process()
98 do_stop_notes( ptr()->audio_column_l_->at_mom() );
100 Midi_item* p = ptr()->midi_item_p();
101 p->channel_i_ = track_l_->number_i_;
103 if ( p->name() != Midi_note::static_name() )
104 output_event( ptr()->audio_column_l_->at_mom(), p );
106 do_start_note( (Midi_note*)p );