lily/midi-item.cc

   1 /*
   2   midi-item.cc -- implement MIDI items.
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1997--2008 Jan Nieuwenhuizen <janneke@gnu.org>
   7 */
   8
   9 #include "midi-item.hh"
  10
  11 #include "duration.hh"
  12 #include "international.hh"
  13 #include "main.hh"
  14 #include "midi-stream.hh"
  15 #include "misc.hh"
  16 #include "program-option.hh"
  17 #include "string-convert.hh"
  18 #include "warn.hh"
  19
  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)
  24
  25 Midi_item *
  26 Midi_item::get_midi (Audio_item *a)
  27 {
  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);
  44   else
  45     assert (0);
  46
  47   return 0;
  48 }
  49
  50
  51
  52 Midi_duration::Midi_duration (Real seconds_f)
  53 {
  54   seconds_ = seconds_f;
  55 }
  56
  57 string
  58 Midi_duration::to_string () const
  59 {
  60   return string ("<duration: ") + ::to_string (seconds_) + ">";
  61 }
  62
  63 Midi_instrument::Midi_instrument (Audio_instrument *a)
  64 {
  65   audio_ = a;
  66   audio_->str_ = String_convert::to_lower (audio_->str_);
  67 }
  68
  69 string
  70 Midi_instrument::to_string () const
  71 {
  72   Byte program_byte = 0;
  73   bool found = false;
  74
  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);
  78   if (found)
  79     program_byte = scm_to_int (program);
  80   else
  81     warning (_f ("no such MIDI instrument: `%s'", audio_->str_.c_str ()));
  82
  83   string str = ::to_string ((char) (0xc0 + channel_)); //YIKES! FIXME : Should be track. -rz
  84   str += ::to_string ((char)program_byte);
  85   return str;
  86 }
  87
  88 Midi_item::Midi_item ()
  89 {
  90 }
  91
  92 Midi_channel_item::Midi_channel_item ()
  93 {
  94   channel_ = 0;
  95 }
  96
  97 Midi_item::~Midi_item ()
  98 {
  99 }
 100
 101 string
 102 int2midi_varint_string (int i)
 103 {
 104   int buffer = i & 0x7f;
 105   while ((i >>= 7) > 0)
 106     {
 107       buffer <<= 8;
 108       buffer |= 0x80;
 109       buffer += (i & 0x7f);
 110     }
 111
 112   string str;
 113   while (1)
 114     {
 115       str += ::to_string ((char)buffer);
 116       if (buffer & 0x80)
 117         buffer >>= 8;
 118       else
 119         break;
 120     }
 121   return str;
 122 }
 123
 124 Midi_key::Midi_key (Audio_key *a)
 125 {
 126   audio_ = a;
 127 }
 128
 129 string
 130 Midi_key::to_string () const
 131 {
 132   string str = "ff5902";
 133   str += String_convert::int2hex (audio_->accidentals_, 2, '0');
 134   if (audio_->major_)
 135     str += String_convert::int2hex (0, 2, '0');
 136   else
 137     str += String_convert::int2hex (1, 2, '0');
 138   return String_convert::hex2bin (str);
 139 }
 140
 141 Midi_time_signature::Midi_time_signature (Audio_time_signature *a)
 142 {
 143   audio_ = a;
 144   clocks_per_1_ = 18;
 145 }
 146
 147 string
 148 Midi_time_signature::to_string () const
 149 {
 150   int num = abs (audio_->beats_);
 151   if (num > 255)
 152     {
 153       warning ("Time signature with more than 255 beats. Truncating");
 154       num = 255;
 155     }
 156
 157   int den = audio_->one_beat_;
 158
 159
 160
 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);
 167 }
 168
 169 Midi_note::Midi_note (Audio_note *a)
 170 {
 171   audio_ = a;
 172   dynamic_byte_ = 0x7f;
 173 }
 174
 175
 176 int
 177 Midi_note::get_fine_tuning () const
 178 {
 179   Rational tune = (audio_->pitch_.tone_pitch ()
 180                    + audio_->transposing_.tone_pitch ()) * Rational (2);
 181   tune -= Rational (get_semitone_pitch ());
 182
 183   tune *= 100;
 184   return (int) double (tune);
 185 }
 186
 187 int
 188 Midi_note::get_semitone_pitch () const
 189 {
 190   return int (double ((audio_->pitch_.tone_pitch ()
 191                        + audio_->transposing_.tone_pitch ()) * Rational (2)));
 192 }
 193
 194 string
 195 Midi_note::to_string () const
 196 {
 197   Byte status_byte = (char) (0x90 + channel_);
 198   string str = "";
 199   int finetune;
 200
 201   // print warning if fine tuning was needed, HJJ
 202   if (get_fine_tuning () != 0)
 203     {
 204       finetune = PITCH_WHEEL_CENTER;
 205       // Move pitch wheel to a shifted position.
 206       // The pitch wheel range (of 4 semitones) is multiplied by the cents.
 207       finetune += (PITCH_WHEEL_RANGE *get_fine_tuning ()) / (4 * 100);
 208
 209       str += ::to_string ((char) (0xE0 + channel_));
 210       str += ::to_string ((char) (finetune & 0x7F));
 211       str += ::to_string ((char) (finetune >> 7));
 212       str += ::to_string ((char) (0x00));
 213     }
 214
 215   str += ::to_string ((char) status_byte);
 216   str += ::to_string ((char) (get_semitone_pitch () + c0_pitch_));
 217   str += ::to_string ((char) dynamic_byte_);
 218
 219   return str;
 220 }
 221
 222 Midi_note_off::Midi_note_off (Midi_note *n)
 223   : Midi_note (n->audio_)
 224 {
 225   on_ = n;
 226   channel_ = n->channel_;
 227
 228   // Anybody who hears any difference, or knows how this works?
 229   //  0 should definitely be avoided, notes stick on some sound cards.
 230   // 64 is supposed to be neutral
 231
 232   aftertouch_byte_ = 64;
 233 }
 234
 235 string
 236 Midi_note_off::to_string () const
 237 {
 238   Byte status_byte = (char) (0x80 + channel_);
 239
 240   string str = ::to_string ((char)status_byte);
 241   str += ::to_string ((char) (get_semitone_pitch () + Midi_note::c0_pitch_));
 242   str += ::to_string ((char)aftertouch_byte_);
 243
 244   if (get_fine_tuning () != 0)
 245     {
 246       // Move pitch wheel back to the central position.
 247       str += ::to_string ((char) 0x00);
 248       str += ::to_string ((char) (0xE0 + channel_));
 249       str += ::to_string ((char) (PITCH_WHEEL_CENTER &0x7F));
 250       str += ::to_string ((char) (PITCH_WHEEL_CENTER >> 7));
 251     }
 252
 253   return str;
 254 }
 255
 256 Midi_dynamic::Midi_dynamic (Audio_dynamic *a)
 257 {
 258   audio_ = a;
 259 }
 260
 261 string
 262 Midi_dynamic::to_string () const
 263 {
 264   Byte status_byte = (char) (0xB0 + channel_);
 265   string str = ::to_string ((char)status_byte);
 266
 267   /*
 268     Main volume controller (per channel):
 269     07 MSB
 270     27 LSB
 271   */
 272   static Real const full_scale = 127;
 273
 274   int volume = (int) (audio_->volume_ * full_scale);
 275   if (volume <= 0)
 276     volume = 1;
 277   if (volume > full_scale)
 278     volume = (int)full_scale;
 279
 280   str += ::to_string ((char)0x07);
 281   str += ::to_string ((char)volume);
 282   return str;
 283 }
 284
 285 Midi_piano_pedal::Midi_piano_pedal (Audio_piano_pedal *a)
 286 {
 287   audio_ = a;
 288 }
 289
 290 string
 291 Midi_piano_pedal::to_string () const
 292 {
 293   Byte status_byte = (char) (0xB0 + channel_);
 294   string str = ::to_string ((char)status_byte);
 295
 296   if (audio_->type_string_ == "Sostenuto")
 297     str += ::to_string ((char)0x42);
 298   else if (audio_->type_string_ == "Sustain")
 299     str += ::to_string ((char)0x40);
 300   else if (audio_->type_string_ == "UnaCorda")
 301     str += ::to_string ((char)0x43);
 302
 303   int pedal = ((1 - audio_->dir_) / 2) * 0x7f;
 304   str += ::to_string ((char)pedal);
 305   return str;
 306 }
 307
 308 Midi_tempo::Midi_tempo (Audio_tempo *a)
 309 {
 310   audio_ = a;
 311 }
 312
 313 string
 314 Midi_tempo::to_string () const
 315 {
 316   int useconds_per_4 = 60 * (int)1e6 / audio_->per_minute_4_;
 317   string str = "ff5103";
 318   str += String_convert::int2hex (useconds_per_4, 6, '0');
 319   return String_convert::hex2bin (str);
 320 }
 321
 322 Midi_text::Midi_text (Audio_text *a)
 323 {
 324   audio_ = a;
 325 }
 326
 327 string
 328 Midi_text::to_string () const
 329 {
 330   string str = "ff" + String_convert::int2hex (audio_->type_, 2, '0');
 331   str = String_convert::hex2bin (str);
 332   str += int2midi_varint_string (audio_->text_string_.length ());
 333   str += audio_->text_string_;
 334   return str;
 335 }
 336
 337 char const *
 338 Midi_item::name () const
 339 {
 340    return this->class_name ();
 341 }