2 midi-walker.cc -- implement Midi_walker
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2003 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 Moment m
= (left
.key
- right
.key
);
36 Midi_walker::Midi_walker (Audio_staff
* audio_staff
, Midi_track
* track
)
40 items_
= &audio_staff
->audio_items_
;
45 Midi_walker::~Midi_walker ()
48 do_stop_notes (last_mom_
+ Moment (Rational (10, 1)));
52 Find out if start_note event is needed, and do it if needed.
55 Midi_walker::do_start_note (Midi_note
* note
)
57 Audio_item
* ptr
= (*items_
)[index_
];
58 Moment stop_mom
= note
->get_length () + ptr
->audio_column_
->at_mom ();
60 bool play_start
= true;
61 for (int i
=0; i
< stop_note_queue
.size (); i
++)
63 /* if this pith already in queue */
64 if (stop_note_queue
[i
].val
->get_pitch () == note
->get_pitch ())
66 if (stop_note_queue
[i
].key
< stop_mom
)
68 /* let stopnote in queue be ignored,
70 stop_note_queue
[i
].ignore_b_
= true;
71 /* don't replay start note, */
77 /* skip this stopnote,
78 don't play the start note */
89 e
.val
= new Midi_note_off (note
);
91 stop_note_queue
.insert (e
);
94 output_event (ptr
->audio_column_
->at_mom (), note
);
99 Output note events for all notes which end before #max_mom#
102 Midi_walker::do_stop_notes (Moment max_mom
)
104 while (stop_note_queue
.size () && stop_note_queue
.front ().key
<= max_mom
)
106 Midi_note_event e
= stop_note_queue
.get ();
113 Moment stop_mom
= e
.key
;
114 Midi_note
* note
= e
.val
;
116 output_event (stop_mom
, note
);
121 Advance the track to #now#, output the item, and adjust current "moment".
124 Midi_walker::output_event (Moment now_mom
, Midi_item
* l
)
126 Moment delta_t
= now_mom
- last_mom_
;
130 this is not correct, but at least it doesn't crash when you
133 if (delta_t
< Moment(0))
135 delta_t
= Moment (0);
139 track_
->add (delta_t
, l
);
143 Midi_walker::process ()
145 Audio_item
* audio
= (*items_
)[index_
];
146 do_stop_notes (audio
->audio_column_
->at_mom ());
148 if (Midi_item
* midi
= Midi_item::get_midi (audio
))
150 midi
->channel_
= track_
->channel_
;
151 //midi->channel_ = track_->number_;
152 if (Midi_note
* note
= dynamic_cast<Midi_note
*> (midi
))
154 if (note
->get_length ().to_bool ())
155 do_start_note (note
);
158 output_event (audio
->audio_column_
->at_mom (), midi
);
163 Midi_walker::ok () const
165 return index_
<items_
->size ();
169 Midi_walker::operator ++ (int)