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--2005 Jan Nieuwenhuizen <janneke@gnu.org>
   7 */
   8
   9 #include "midi-item.hh"
  10
  11 #include "warn.hh"
  12 #include "main.hh"
  13 #include "misc.hh"
  14 #include "string-convert.hh"
  15 #include "midi-stream.hh"
  16 #include "duration.hh"
  17 #include "scm-option.hh"
  18 #include "killing-cons.tcc"
  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 i->text_string_.length () ? new Midi_text (i) : 0;
  44     return new Midi_text (i);
  45   else
  46     assert (0);
  47
  48   // isn't C++ grand?
  49   return 0;
  50 }
  51
  52 void
  53 Midi_chunk::set (String header_string, String data_string, String footer_string)
  54 {
  55   data_string_ = data_string;
  56   footer_string_ = footer_string;
  57   header_string_ = header_string;
  58 }
  59
  60 String
  61 Midi_chunk::data_string () const
  62 {
  63   return data_string_;
  64 }
  65
  66 String
  67 Midi_chunk::to_string () const
  68 {
  69   String str = header_string_;
  70   String dat = data_string ();
  71   String length_string = String_convert::int2hex (dat.length ()
  72                                                   + footer_string_.length (), 8, '0');
  73   length_string = String_convert::hex2bin (length_string);
  74   str += length_string;
  75   str += dat;
  76   str += footer_string_;
  77   return str;
  78 }
  79
  80 Midi_duration::Midi_duration (Real seconds_f)
  81 {
  82   seconds_ = seconds_f;
  83 }
  84
  85 String
  86 Midi_duration::to_string () const
  87 {
  88   return String ("<duration: ") + ::to_string (seconds_) + ">";
  89 }
  90
  91 Midi_event::Midi_event (Moment delta_mom, Midi_item *midi)
  92 {
  93   delta_mom_ = delta_mom;
  94   midi_ = midi;
  95 }
  96
  97 /*
  98   ugh. midi output badly broken since grace note hackage.
  99 */
 100 String
 101 Midi_event::to_string () const
 102 {
 103   Rational rat_dt = (delta_mom_.main_part_ * Rational (384)
 104                      + delta_mom_.grace_part_ * Rational (100)) * Rational (4);
 105   int delta_i = int (rat_dt);
 106
 107   String delta_string = Midi_item::i2varint_string (delta_i);
 108   String midi_string = midi_->to_string ();
 109   assert (midi_string.length ());
 110   return delta_string + midi_string;
 111 }
 112
 113 Midi_header::Midi_header (int format_i, int tracks_i, int clocks_per_4_i)
 114 {
 115   String str;
 116
 117   String format_string = String_convert::int2hex (format_i, 4, '0');
 118   str += String_convert::hex2bin (format_string);
 119
 120   String tracks_string = String_convert::int2hex (tracks_i, 4, '0');
 121   str += String_convert::hex2bin (tracks_string);
 122
 123   String tempo_string = String_convert::int2hex (clocks_per_4_i, 4, '0');
 124   str += String_convert::hex2bin (tempo_string);
 125
 126   set ("MThd", str, "");
 127 }
 128
 129 Midi_instrument::Midi_instrument (Audio_instrument *a)
 130 {
 131   audio_ = a;
 132   audio_->str_.to_lower ();
 133 }
 134
 135 String
 136 Midi_instrument::to_string () const
 137 {
 138   Byte program_byte = 0;
 139   bool found = false;
 140
 141   /*
 142     UGH. don't use eval.
 143   */
 144   SCM proc = ly_lily_module_constant ("midi-program");
 145   SCM program = scm_call_1 (proc, ly_symbol2scm (audio_->str_.to_str0 ()));
 146   found = (program != SCM_BOOL_F);
 147   if (found)
 148     program_byte = scm_to_int (program);
 149   else
 150     warning (_f ("no such MIDI instrument: `%s'", audio_->str_.to_str0 ()));
 151
 152   String str = ::to_string ((char) (0xc0 + channel_)); //YIKES! FIXME : Should be track. -rz
 153   str += ::to_string ((char)program_byte);
 154   return str;
 155 }
 156
 157 Midi_item::Midi_item ()
 158 {
 159   channel_ = 0;
 160 }
 161
 162 Midi_item::~Midi_item ()
 163 {
 164 }
 165
 166 String
 167 Midi_item::i2varint_string (int i)
 168 {
 169   int buffer_i = i & 0x7f;
 170   while ((i >>= 7) > 0)
 171     {
 172       buffer_i <<= 8;
 173       buffer_i |= 0x80;
 174       buffer_i += (i & 0x7f);
 175     }
 176
 177   String str;
 178   while (1)
 179     {
 180       str += ::to_string ((char)buffer_i);
 181       if (buffer_i & 0x80)
 182         buffer_i >>= 8;
 183       else
 184         break;
 185     }
 186   return str;
 187 }
 188
 189 Midi_key::Midi_key (Audio_key *a)
 190 {
 191   audio_ = a;
 192 }
 193
 194 String
 195 Midi_key::to_string () const
 196 {
 197   String str = "ff5902";
 198   str += String_convert::int2hex (audio_->accidentals_, 2, '0');
 199   if (audio_->major_)
 200     str += String_convert::int2hex (0, 2, '0');
 201   else
 202     str += String_convert::int2hex (1, 2, '0');
 203   return String_convert::hex2bin (str);
 204 }
 205
 206 Midi_time_signature::Midi_time_signature (Audio_time_signature* a)
 207 {
 208   audio_ = a;
 209   clocks_per_1_ = 18;
 210 }
 211
 212 String
 213 Midi_time_signature::to_string () const
 214 {
 215   int num = audio_->beats_;
 216   int den = audio_->one_beat_;
 217
 218   String str = "ff5804";
 219   str += String_convert::int2hex (num, 2, '0');
 220   str += String_convert::int2hex (intlog2 (den) , 2, '0');
 221   str += String_convert::int2hex (clocks_per_1_, 2, '0');
 222   str += String_convert::int2hex (8, 2, '0');
 223   return String_convert::hex2bin (str);
 224 }
 225
 226 Midi_note::Midi_note (Audio_note* a)
 227 {
 228   audio_ = a;
 229   dynamic_byte_ = 0x7f;
 230 }
 231
 232 Moment
 233 Midi_note::get_length () const
 234 {
 235   Moment m = audio_->length_mom_;
 236   return m;
 237 }
 238
 239 int
 240 Midi_note::get_fine_tuning () const
 241 {
 242   int ft = audio_->pitch_.quartertone_pitch ();
 243   ft -= 2 * audio_->pitch_.semitone_pitch ();
 244   ft *= 50; // 1 quarter tone = 50 cents
 245   return ft;
 246 }
 247
 248 int
 249 Midi_note::get_pitch () const
 250 {
 251   int p = audio_->pitch_.semitone_pitch () + audio_->transposing_;
 252   if (p == INT_MAX)
 253     {
 254       warning (_ ("silly pitch"));
 255       p = 0;
 256     }
 257   return p;
 258 }
 259
 260 String
 261 Midi_note::to_string () const
 262 {
 263   Byte status_byte = (char) (0x90 + channel_);
 264   String str = "";
 265   int finetune;
 266
 267   // print warning if fine tuning was needed, HJJ
 268   if (get_fine_tuning () != 0)
 269     {
 270       warning (_f ("experimental: temporarily fine tuning (of %d cents) a channel.",
 271                    get_fine_tuning ()));
 272
 273       finetune = PITCH_WHEEL_CENTER;
 274       // Move pitch wheel to a shifted position.
 275       // The pitch wheel range (of 4 semitones) is multiplied by the cents.
 276       finetune += (PITCH_WHEEL_RANGE *get_fine_tuning ()) / (4 * 100);
 277
 278       str += ::to_string ((char) (0xE0 + channel_));
 279       str += ::to_string ((char) (finetune & 0x7F));
 280       str += ::to_string ((char) (finetune >> 7));
 281       str += ::to_string ((char) (0x00));
 282     }
 283
 284   str += ::to_string ((char)status_byte);
 285   str += ::to_string ((char) (get_pitch () + c0_pitch_i_));
 286   str += ::to_string ((char)dynamic_byte_);
 287
 288   return str;
 289 }
 290
 291 Midi_note_off::Midi_note_off (Midi_note *n)
 292   : Midi_note (n->audio_)
 293 {
 294   on_ = n;
 295   channel_ = n->channel_;
 296
 297   // Anybody who hears any difference, or knows how this works?
 298   //  0 should definitely be avoided, notes stick on some sound cards.
 299   // 64 is supposed to be neutral
 300
 301   aftertouch_byte_ = 64;
 302 }
 303
 304 String
 305 Midi_note_off::to_string () const
 306 {
 307   Byte status_byte = (char) (0x80 + channel_);
 308
 309   String str = ::to_string ((char)status_byte);
 310   str += ::to_string ((char) (get_pitch () + Midi_note::c0_pitch_i_));
 311   str += ::to_string ((char)aftertouch_byte_);
 312
 313   if (get_fine_tuning () != 0)
 314     {
 315       // Move pitch wheel back to the central position.
 316       str += ::to_string ((char) 0x00);
 317       str += ::to_string ((char) (0xE0 + channel_));
 318       str += ::to_string ((char) (PITCH_WHEEL_CENTER &0x7F));
 319       str += ::to_string ((char) (PITCH_WHEEL_CENTER >> 7));
 320     }
 321
 322   return str;
 323 }
 324
 325 Midi_dynamic::Midi_dynamic (Audio_dynamic *a)
 326 {
 327   audio_ = a;
 328 }
 329
 330 String
 331 Midi_dynamic::to_string () const
 332 {
 333   Byte status_byte = (char) (0xB0 + channel_);
 334   String str = ::to_string ((char)status_byte);
 335
 336   /*
 337     Main volume controller (per channel):
 338     07 MSB
 339     27 LSB
 340   */
 341   static Real const full_scale = 127;
 342
 343   int volume = (int) (audio_->volume_ * full_scale);
 344   if (volume <= 0)
 345     volume = 1;
 346   if (volume > full_scale)
 347     volume = (int)full_scale;
 348
 349   str += ::to_string ((char)0x07);
 350   str += ::to_string ((char)volume);
 351   return str;
 352 }
 353
 354 Midi_piano_pedal::Midi_piano_pedal (Audio_piano_pedal *a)
 355 {
 356   audio_ = a;
 357 }
 358
 359 String
 360 Midi_piano_pedal::to_string () const
 361 {
 362   Byte status_byte = (char) (0xB0 + channel_);
 363   String str = ::to_string ((char)status_byte);
 364
 365   if (audio_->type_string_ == "Sostenuto")
 366     str += ::to_string ((char)0x42);
 367   else if (audio_->type_string_ == "Sustain")
 368     str += ::to_string ((char)0x40);
 369   else if (audio_->type_string_ == "UnaCorda")
 370     str += ::to_string ((char)0x43);
 371
 372   int pedal = ((1 - audio_->dir_) / 2) * 0x7f;
 373   str += ::to_string ((char)pedal);
 374   return str;
 375 }
 376
 377 Midi_tempo::Midi_tempo (Audio_tempo *a)
 378 {
 379   audio_ = a;
 380 }
 381
 382 String
 383 Midi_tempo::to_string () const
 384 {
 385   int useconds_per_4_i = 60 * (int)1e6 / audio_->per_minute_4_;
 386   String str = "ff5103";
 387   str += String_convert::int2hex (useconds_per_4_i, 6, '0');
 388   return String_convert::hex2bin (str);
 389 }
 390
 391 Midi_text::Midi_text (Audio_text* a)
 392 {
 393   audio_ = a;
 394 }
 395
 396 String
 397 Midi_text::to_string () const
 398 {
 399   String str = "ff" + String_convert::int2hex (audio_->type_, 2, '0');
 400   str = String_convert::hex2bin (str);
 401   str += i2varint_string (audio_->text_string_.length ());
 402   str += audio_->text_string_;
 403   return str;
 404 }
 405
 406 Midi_track::Midi_track ()
 407   : Midi_chunk ()
 408 {
 409   //                4D 54 72 6B     MTrk
 410   //                00 00 00 3B     chunk length (59)
 411   //        00      FF 58 04 04 02 18 08    time signature
 412   //        00      FF 51 03 07 A1 20       tempo
 413
 414   // FF 59 02 sf mi  Key Signature
 415   //         sf = -7:  7 flats
 416   //         sf = -1:  1 flat
 417   //         sf = 0:  key of C
 418   //         sf = 1:  1 sharp
 419   //         sf = 7: 7 sharps
 420   //         mi = 0:  major key
 421   //         mi = 1:  minor key
 422
 423   number_ = 0;
 424
 425   char const *data_str0 = ""
 426     //        "00" "ff58" "0404" "0218" "08"
 427     //  "00" "ff51" "0307" "a120"
 428     // why a key at all, in midi?
 429     // key: C
 430     //  "00" "ff59" "02" "00" "00"
 431     // key: F (scsii-menuetto)
 432     //                            "00" "ff59" "02" "ff" "00"
 433     ;
 434
 435   String data_string;
 436   // only for format 0 (currently using format 1)?
 437   data_string += String_convert::hex2bin (data_str0);
 438
 439   char const *footer_str0 = "00" "ff2f" "00";
 440   String footer_string = String_convert::hex2bin (footer_str0);
 441
 442   set ("MTrk", data_string, footer_string);
 443 }
 444
 445 void
 446 Midi_track::add (Moment delta_time_mom, Midi_item *midi)
 447 {
 448   assert (delta_time_mom >= Moment (0));
 449
 450   Midi_event *e = new Midi_event (delta_time_mom, midi);
 451   event_p_list_.append (new Killing_cons<Midi_event> (e, 0));
 452 }
 453
 454 String
 455 Midi_track::data_string () const
 456 {
 457   String str = Midi_chunk::data_string ();
 458   if (midi_debug_global_b)
 459     str += "\n";
 460   for (Cons<Midi_event> *i = event_p_list_.head_; i; i = i->next_)
 461     {
 462       str += i->car_->to_string ();
 463       if (midi_debug_global_b)
 464         str += "\n";
 465     }
 466   return str;
 467 }