2 midi-walker.cc -- implement Midi_walker
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--1998 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
)
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_p
)
48 Moment stop_mom
= note_p
->duration() + ptr ()->audio_column_l_
->at_mom ();
49 for (int i
=0; i
< stop_note_queue
.size(); i
++)
51 if (stop_note_queue
[i
].val
->pitch_i() == note_p
->pitch_i ())
53 if (stop_note_queue
[i
].key
< stop_mom
)
54 stop_note_queue
[i
].ignore_b_
= true;
64 e
.val
= new Midi_note_off (note_p
);
66 stop_note_queue
.insert (e
);
68 output_event (ptr()->audio_column_l_
->at_mom (), note_p
);
72 Output note events for all notes which end before #max_mom#
75 Midi_walker::do_stop_notes (Moment max_mom
)
77 while (stop_note_queue
.size() && stop_note_queue
.front ().key
<= max_mom
)
79 Midi_note_event e
= stop_note_queue
.get();
86 Moment stop_mom
= e
.key
;
87 Midi_note_off
* note_p
= e
.val
;
89 output_event (stop_mom
, note_p
);
94 Advance the track to #now#, output the item, and adjust current "moment".
97 Midi_walker::output_event (Moment now_mom
, Midi_item
* l
)
99 Moment delta_t
= now_mom
- last_mom_
;
100 last_mom_
+= delta_t
;
101 track_l_
->add (delta_t
, l
);
105 Midi_walker::process()
107 do_stop_notes (ptr()->audio_column_l_
->at_mom ());
109 Midi_item
* p
= ptr()->midi_item_p ();
112 p
->channel_i_
= track_l_
->number_i_
;
114 if (Midi_note
*mi
= dynamic_cast<Midi_note
*>(p
))
117 output_event (ptr()->audio_column_l_
->at_mom (), p
);