2 midi-item.cc -- implement MIDI items.
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2007 Jan Nieuwenhuizen <janneke@gnu.org>
9 #include "midi-item.hh"
11 #include "duration.hh"
12 #include "international.hh"
14 #include "midi-stream.hh"
16 #include "program-option.hh"
17 #include "string-convert.hh"
20 #define PITCH_WHEEL_TOP 0x3FFF
21 #define PITCH_WHEEL_CENTER 0x2000
22 #define PITCH_WHEEL_BOTTOM 0x0000
23 #define PITCH_WHEEL_RANGE (PITCH_WHEEL_TOP - PITCH_WHEEL_BOTTOM)
26 Midi_item::get_midi (Audio_item *a)
28 if (Audio_key *i = dynamic_cast<Audio_key *> (a))
29 return new Midi_key (i);
30 else if (Audio_instrument *i = dynamic_cast<Audio_instrument *> (a))
31 return i->str_.length () ? new Midi_instrument (i) : 0;
32 else if (Audio_note *i = dynamic_cast<Audio_note *> (a))
33 return new Midi_note (i);
34 else if (Audio_dynamic *i = dynamic_cast<Audio_dynamic *> (a))
35 return new Midi_dynamic (i);
36 else if (Audio_piano_pedal *i = dynamic_cast<Audio_piano_pedal *> (a))
37 return new Midi_piano_pedal (i);
38 else if (Audio_tempo *i = dynamic_cast<Audio_tempo *> (a))
39 return new Midi_tempo (i);
40 else if (Audio_time_signature *i = dynamic_cast<Audio_time_signature *> (a))
41 return new Midi_time_signature (i);
42 else if (Audio_text *i = dynamic_cast<Audio_text *> (a))
43 return new Midi_text (i);
52 Midi_duration::Midi_duration (Real seconds_f)
58 Midi_duration::to_string () const
60 return string ("<duration: ") + ::to_string (seconds_) + ">";
63 Midi_instrument::Midi_instrument (Audio_instrument *a)
66 audio_->str_ = String_convert::to_lower (audio_->str_);
70 Midi_instrument::to_string () const
72 Byte program_byte = 0;
75 SCM proc = ly_lily_module_constant ("midi-program");
76 SCM program = scm_call_1 (proc, ly_symbol2scm (audio_->str_.c_str ()));
77 found = (program != SCM_BOOL_F);
79 program_byte = scm_to_int (program);
81 warning (_f ("no such MIDI instrument: `%s'", audio_->str_.c_str ()));
83 string str = ::to_string ((char) (0xc0 + channel_)); //YIKES! FIXME : Should be track. -rz
84 str += ::to_string ((char)program_byte);
88 Midi_item::Midi_item ()
92 Midi_channel_item::Midi_channel_item ()
97 Midi_item::~Midi_item ()
102 int2midi_varint_string (int i)
104 int buffer = i & 0x7f;
105 while ((i >>= 7) > 0)
109 buffer += (i & 0x7f);
115 str += ::to_string ((char)buffer);
124 Midi_key::Midi_key (Audio_key *a)
130 Midi_key::to_string () const
132 string str = "ff5902";
133 str += String_convert::int2hex (audio_->accidentals_, 2, '0');
135 str += String_convert::int2hex (0, 2, '0');
137 str += String_convert::int2hex (1, 2, '0');
138 return String_convert::hex2bin (str);
141 Midi_time_signature::Midi_time_signature (Audio_time_signature *a)
148 Midi_time_signature::to_string () const
150 int num = abs (audio_->beats_);
153 warning ("Time signature with more than 255 beats. Truncating");
157 int den = audio_->one_beat_;
161 string str = "ff5804";
162 str += String_convert::int2hex (num, 2, '0');
163 str += String_convert::int2hex (intlog2 (den), 2, '0');
164 str += String_convert::int2hex (clocks_per_1_, 2, '0');
165 str += String_convert::int2hex (8, 2, '0');
166 return String_convert::hex2bin (str);
169 Midi_note::Midi_note (Audio_note *a)
172 dynamic_byte_ = 0x7f;
177 Midi_note::get_fine_tuning () const
179 Rational tune = (audio_->pitch_.tone_pitch ()
180 + audio_->transposing_.tone_pitch ()) * Rational (2);
181 tune -= Rational (get_semitone_pitch ());
184 return (int) double (tune);
188 Midi_note::get_semitone_pitch () const
190 return int (double ((audio_->pitch_.tone_pitch ()
191 + audio_->transposing_.tone_pitch ()) * Rational (2)));
195 Midi_note::to_string () const
197 Byte status_byte = (char) (0x90 + channel_);
201 // print warning if fine tuning was needed, HJJ
202 if (get_fine_tuning () != 0)
204 warning (_f ("experimental: temporarily fine tuning (of %d cents) a channel.",
205 get_fine_tuning ()));
207 finetune = PITCH_WHEEL_CENTER;
208 // Move pitch wheel to a shifted position.
209 // The pitch wheel range (of 4 semitones) is multiplied by the cents.
210 finetune += (PITCH_WHEEL_RANGE *get_fine_tuning ()) / (4 * 100);
212 str += ::to_string ((char) (0xE0 + channel_));
213 str += ::to_string ((char) (finetune & 0x7F));
214 str += ::to_string ((char) (finetune >> 7));
215 str += ::to_string ((char) (0x00));
218 str += ::to_string ((char) status_byte);
219 str += ::to_string ((char) (get_semitone_pitch () + c0_pitch_));
220 str += ::to_string ((char)dynamic_byte_);
225 Midi_note_off::Midi_note_off (Midi_note *n)
226 : Midi_note (n->audio_)
229 channel_ = n->channel_;
231 // Anybody who hears any difference, or knows how this works?
232 // 0 should definitely be avoided, notes stick on some sound cards.
233 // 64 is supposed to be neutral
235 aftertouch_byte_ = 64;
239 Midi_note_off::to_string () const
241 Byte status_byte = (char) (0x80 + channel_);
243 string str = ::to_string ((char)status_byte);
244 str += ::to_string ((char) (get_semitone_pitch () + Midi_note::c0_pitch_));
245 str += ::to_string ((char)aftertouch_byte_);
247 if (get_fine_tuning () != 0)
249 // Move pitch wheel back to the central position.
250 str += ::to_string ((char) 0x00);
251 str += ::to_string ((char) (0xE0 + channel_));
252 str += ::to_string ((char) (PITCH_WHEEL_CENTER &0x7F));
253 str += ::to_string ((char) (PITCH_WHEEL_CENTER >> 7));
259 Midi_dynamic::Midi_dynamic (Audio_dynamic *a)
265 Midi_dynamic::to_string () const
267 Byte status_byte = (char) (0xB0 + channel_);
268 string str = ::to_string ((char)status_byte);
271 Main volume controller (per channel):
275 static Real const full_scale = 127;
277 int volume = (int) (audio_->volume_ * full_scale);
280 if (volume > full_scale)
281 volume = (int)full_scale;
283 str += ::to_string ((char)0x07);
284 str += ::to_string ((char)volume);
288 Midi_piano_pedal::Midi_piano_pedal (Audio_piano_pedal *a)
294 Midi_piano_pedal::to_string () const
296 Byte status_byte = (char) (0xB0 + channel_);
297 string str = ::to_string ((char)status_byte);
299 if (audio_->type_string_ == "Sostenuto")
300 str += ::to_string ((char)0x42);
301 else if (audio_->type_string_ == "Sustain")
302 str += ::to_string ((char)0x40);
303 else if (audio_->type_string_ == "UnaCorda")
304 str += ::to_string ((char)0x43);
306 int pedal = ((1 - audio_->dir_) / 2) * 0x7f;
307 str += ::to_string ((char)pedal);
311 Midi_tempo::Midi_tempo (Audio_tempo *a)
317 Midi_tempo::to_string () const
319 int useconds_per_4 = 60 * (int)1e6 / audio_->per_minute_4_;
320 string str = "ff5103";
321 str += String_convert::int2hex (useconds_per_4, 6, '0');
322 return String_convert::hex2bin (str);
325 Midi_text::Midi_text (Audio_text *a)
331 Midi_text::to_string () const
333 string str = "ff" + String_convert::int2hex (audio_->type_, 2, '0');
334 str = String_convert::hex2bin (str);
335 str += int2midi_varint_string (audio_->text_string_.length ());
336 str += audio_->text_string_;
341 Midi_item::name () const
343 return this->class_name ();