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--2004 Jan Nieuwenhuizen <janneke@gnu.org>
   7  */
   8
   9 #include "warn.hh"
  10 #include "main.hh"
  11 #include "misc.hh"
  12 #include "string.hh"
  13 #include "string-convert.hh"
  14 #include "midi-item.hh"
  15 #include "midi-stream.hh"
  16 #include "audio-item.hh"
  17 #include "duration.hh"
  18 #include "scm-option.hh"
  19
  20 #include "killing-cons.tcc"
  21
  22 #define PITCH_WHEEL_TOP    0x3FFF
  23 #define PITCH_WHEEL_CENTER 0x2000
  24 #define PITCH_WHEEL_BOTTOM 0x0000
  25 #define PITCH_WHEEL_RANGE  (PITCH_WHEEL_TOP - PITCH_WHEEL_BOTTOM)
  26
  27 Midi_item*
  28 Midi_item::get_midi (Audio_item* a)
  29 {
  30   if (Audio_key* i = dynamic_cast<Audio_key*> (a))
  31     return new Midi_key (i);
  32   else if (Audio_instrument* i = dynamic_cast<Audio_instrument*> (a))
  33     return i->str_.length () ? new Midi_instrument (i) : 0;
  34   else if (Audio_note* i = dynamic_cast<Audio_note*> (a))
  35     return new Midi_note (i);
  36   else if (Audio_dynamic* i = dynamic_cast<Audio_dynamic*> (a))
  37     return new Midi_dynamic (i);
  38   else if (Audio_piano_pedal* i = dynamic_cast<Audio_piano_pedal*> (a))
  39     return new Midi_piano_pedal (i);
  40   else if (Audio_tempo* i = dynamic_cast<Audio_tempo*> (a))
  41     return new Midi_tempo (i);
  42   else if (Audio_time_signature* i = dynamic_cast<Audio_time_signature*> (a))
  43     return new Midi_time_signature (i);
  44   else if (Audio_text* i = dynamic_cast<Audio_text*> (a))
  45     //return i->text_string_.length () ? new Midi_text (i) : 0;
  46     return new Midi_text (i);
  47   else
  48     assert (0);
  49
  50   // isn't C++ grand?
  51   return 0;
  52 }
  53
  54 void
  55 Midi_chunk::set (String header_string, String data_string, String footer_string)
  56 {
  57   data_string_ = data_string;
  58   footer_string_ = footer_string;
  59   header_string_ = header_string;
  60 }
  61
  62 String
  63 Midi_chunk::data_string () const
  64 {
  65   return data_string_;
  66 }
  67
  68 String
  69 Midi_chunk::to_string () const
  70 {
  71   String str = header_string_;
  72   String dat = data_string ();
  73   String length_string = String_convert::int2hex (dat.length ()
  74     + footer_string_.length (), 8, '0');
  75   length_string = String_convert::hex2bin (length_string);
  76   str += length_string;
  77   str += dat;
  78   str += footer_string_;
  79   return str;
  80 }
  81
  82 Midi_duration::Midi_duration (Real seconds_f)
  83 {
  84   seconds_ = seconds_f;
  85 }
  86
  87 String
  88 Midi_duration::to_string () const
  89 {
  90   return String ("<duration: ") + ::to_string (seconds_) + ">";
  91 }
  92
  93 Midi_event::Midi_event (Moment delta_mom, Midi_item* midi)
  94 {
  95   delta_mom_ = delta_mom;
  96   midi_ = midi;
  97 }
  98
  99 /*
 100   ugh. midi output badly broken since grace note hackage.
 101  */
 102 String
 103 Midi_event::to_string () const
 104 {
 105   Rational rat_dt = (delta_mom_.main_part_ * Rational (384) +
 106     delta_mom_.grace_part_ * Rational (100))*Rational (4);
 107   int delta_i = int (rat_dt);
 108
 109   String delta_string = Midi_item::i2varint_string (delta_i);
 110   String midi_string = midi_->to_string ();
 111   assert (midi_string.length ());
 112   return delta_string + midi_string;
 113 }
 114
 115
 116 Midi_header::Midi_header (int format_i, int tracks_i, int clocks_per_4_i)
 117 {
 118   String str;
 119
 120   String format_string = String_convert::int2hex (format_i, 4, '0');
 121   str += String_convert::hex2bin (format_string);
 122
 123   String tracks_string = String_convert::int2hex (tracks_i, 4, '0');
 124   str += String_convert::hex2bin (tracks_string);
 125
 126   String tempo_string = String_convert::int2hex (clocks_per_4_i, 4, '0');
 127   str += String_convert::hex2bin (tempo_string);
 128
 129   set ("MThd", str, "");
 130 }
 131
 132 Midi_instrument::Midi_instrument (Audio_instrument* a)
 133 {
 134   audio_ = a;
 135   audio_->str_.to_lower ();
 136 }
 137
 138 String
 139 Midi_instrument::to_string () const
 140 {
 141   Byte program_byte = 0;
 142   bool found = false;
 143
 144   /*
 145     UGH. don't use eval.
 146    */
 147   SCM proc = ly_scheme_function ("midi-program");
 148   SCM program = scm_call_1 (proc, ly_symbol2scm (audio_->str_.to_str0 ()));
 149   found = (program != SCM_BOOL_F);
 150   if (found)
 151     program_byte = ly_scm2int (program);
 152   else
 153       warning (_f ("no such MIDI instrument: `%s'", audio_->str_.to_str0 ()));
 154
 155   String str = ::to_string ((char) (0xc0 + channel_)); //YIKES! FIXME: Should be track. -rz
 156   str += ::to_string ((char)program_byte);
 157   return str;
 158 }
 159
 160 Midi_item::Midi_item ()
 161 {
 162   channel_ = 0;
 163 }
 164
 165 Midi_item::~Midi_item ()
 166 {
 167 }
 168
 169 String
 170 Midi_item::i2varint_string (int i)
 171 {
 172   int buffer_i = i & 0x7f;
 173   while ((i >>= 7) > 0)
 174     {
 175       buffer_i <<= 8;
 176       buffer_i |= 0x80;
 177       buffer_i += (i & 0x7f);
 178     }
 179
 180   String str;
 181   while (1)
 182     {
 183       str += ::to_string ((char)buffer_i);
 184       if (buffer_i & 0x80)
 185         buffer_i >>= 8;
 186       else
 187         break;
 188     }
 189   return str;
 190 }
 191
 192 Midi_key::Midi_key (Audio_key*a)
 193 {
 194   audio_ = a;
 195 }
 196
 197 String
 198 Midi_key::to_string () const
 199 {
 200   String str = "ff5902";
 201   str += String_convert::int2hex (audio_->accidentals_, 2, '0');
 202   if (audio_->major_)
 203     str += String_convert::int2hex (0, 2, '0');
 204   else
 205     str += String_convert::int2hex (1, 2, '0');
 206   return String_convert::hex2bin (str);
 207 }
 208
 209 Midi_time_signature::Midi_time_signature (Audio_time_signature* a)
 210 {
 211   audio_ = a;
 212   clocks_per_1_ = 18;
 213 }
 214
 215 String
 216 Midi_time_signature::to_string () const
 217 {
 218   int num = audio_->beats_;
 219   int den = audio_->one_beat_;
 220
 221   String str = "ff5804";
 222   str += String_convert::int2hex (num, 2, '0');
 223   str += String_convert::int2hex (intlog2 (den) , 2, '0');
 224   str += String_convert::int2hex (clocks_per_1_, 2, '0');
 225   str += String_convert::int2hex (8, 2, '0');
 226   return String_convert::hex2bin (str);
 227 }
 228
 229 Midi_note::Midi_note (Audio_note* a)
 230 {
 231   audio_ = a;
 232   dynamic_byte_ = 0x7f;
 233 }
 234
 235 Moment
 236 Midi_note::get_length () const
 237 {
 238   Moment m = audio_->length_mom_;
 239   return m;
 240 }
 241
 242 int
 243 Midi_note::get_fine_tuning () const
 244 {
 245   int ft = audio_->pitch_.quartertone_pitch ();
 246   ft -= 2 * audio_->pitch_.semitone_pitch ();
 247   ft *= 50; // 1 quarter tone = 50 cents
 248   return ft;
 249 }
 250
 251 int
 252 Midi_note::get_pitch () const
 253 {
 254   int p = audio_->pitch_.semitone_pitch () + audio_->transposing_;
 255   if (p == INT_MAX)
 256     {
 257       warning (_ ("silly pitch"));
 258       p = 0;
 259      }
 260   return p;
 261 }
 262
 263 String
 264 Midi_note::to_string () const
 265 {
 266   Byte status_byte = (char) (0x90 + channel_);
 267   String str = "";
 268   int finetune;
 269
 270   // print warning if fine tuning was needed, HJJ
 271   if (get_fine_tuning () != 0)
 272     {
 273       warning (_f ("Experimental: temporarily fine tuning (of %d cents) a channel.",
 274             get_fine_tuning ()));
 275
 276       finetune = PITCH_WHEEL_CENTER;
 277       // Move pitch wheel to a shifted position.
 278       // The pitch wheel range (of 4 semitones) is multiplied by the cents.
 279       finetune += (PITCH_WHEEL_RANGE * get_fine_tuning ()) / (4 * 100);
 280
 281       str += ::to_string ((char) (0xE0 + channel_));
 282       str += ::to_string ((char) (finetune & 0x7F));
 283       str += ::to_string ((char) (finetune >> 7));
 284       str += ::to_string ((char) (0x00));
 285     }
 286
 287   str += ::to_string ((char)status_byte);
 288   str += ::to_string ((char) (get_pitch () + c0_pitch_i_));
 289   str += ::to_string ((char)dynamic_byte_);
 290
 291   return str;
 292 }
 293
 294 Midi_note_off::Midi_note_off (Midi_note* n)
 295   : Midi_note (n->audio_)
 296 {
 297   on_ = n;
 298   channel_ = n->channel_;
 299
 300   // Anybody who hears any difference, or knows how this works?
 301   //  0 should definitely be avoided, notes stick on some sound cards.
 302   // 64 is supposed to be neutral
 303
 304   aftertouch_byte_ = 64;
 305 }
 306
 307 String
 308 Midi_note_off::to_string () const
 309 {
 310   Byte status_byte = (char) (0x80 + channel_);
 311
 312   String str = ::to_string ((char)status_byte);
 313   str += ::to_string ((char) (get_pitch () + Midi_note::c0_pitch_i_));
 314   str += ::to_string ((char)aftertouch_byte_);
 315
 316   if (get_fine_tuning () != 0)
 317     {
 318       // Move pitch wheel back to the central position.
 319       str += ::to_string ((char) 0x00);
 320       str += ::to_string ((char) (0xE0 + channel_));
 321       str += ::to_string ((char) (PITCH_WHEEL_CENTER & 0x7F));
 322       str += ::to_string ((char) (PITCH_WHEEL_CENTER >> 7));
 323     }
 324
 325   return str;
 326 }
 327
 328 Midi_dynamic::Midi_dynamic (Audio_dynamic* a)
 329 {
 330   audio_ = a;
 331 }
 332
 333 String
 334 Midi_dynamic::to_string () const
 335 {
 336   Byte status_byte = (char) (0xB0 + channel_);
 337   String str = ::to_string ((char)status_byte);
 338
 339   /*
 340     Main volume controller (per channel):
 341     07 MSB
 342     27 LSB
 343    */
 344   static Real const full_scale = 127;
 345
 346   int volume = (int) (audio_->volume_*full_scale);
 347   if (volume <= 0)
 348     volume = 1;
 349   if (volume > full_scale)
 350     volume = (int)full_scale;
 351
 352   str += ::to_string ((char)0x07);
 353   str += ::to_string ((char)volume);
 354   return str;
 355 }
 356
 357 Midi_piano_pedal::Midi_piano_pedal (Audio_piano_pedal* a)
 358 {
 359   audio_ = a;
 360 }
 361
 362 String
 363 Midi_piano_pedal::to_string () const
 364 {
 365   Byte status_byte = (char) (0xB0 + channel_);
 366   String str = ::to_string ((char)status_byte);
 367
 368   if (audio_->type_string_ == "Sostenuto")
 369     str += ::to_string ((char)0x42);
 370   else if (audio_->type_string_ == "Sustain")
 371     str += ::to_string ((char)0x40);
 372   else if (audio_->type_string_ == "UnaCorda")
 373     str += ::to_string ((char)0x43);
 374
 375   int pedal = ((1 - audio_->dir_) / 2) * 0x7f;
 376   str += ::to_string ((char)pedal);
 377   return str;
 378 }
 379
 380 Midi_tempo::Midi_tempo (Audio_tempo* a)
 381 {
 382   audio_ = a;
 383 }
 384
 385 String
 386 Midi_tempo::to_string () const
 387 {
 388   int useconds_per_4_i = 60 * (int)1e6 / audio_->per_minute_4_;
 389   String str = "ff5103";
 390   str += String_convert::int2hex (useconds_per_4_i, 6, '0');
 391   return String_convert::hex2bin (str);
 392 }
 393
 394 Midi_text::Midi_text (Audio_text* a)
 395 {
 396   audio_ = a;
 397 }
 398
 399 String
 400 Midi_text::to_string () const
 401 {
 402   String str = "ff" + String_convert::int2hex (audio_->type_, 2, '0');
 403   str = String_convert::hex2bin (str);
 404   str += i2varint_string (audio_->text_string_.length ());
 405   str += audio_->text_string_;
 406   return str;
 407 }
 408
 409 Midi_track::Midi_track ()
 410   : Midi_chunk ()
 411 {
 412   //                4D 54 72 6B     MTrk
 413   //                00 00 00 3B     chunk length (59)
 414   //        00      FF 58 04 04 02 18 08    time signature
 415   //        00      FF 51 03 07 A1 20       tempo
 416
 417 // FF 59 02 sf mi  Key Signature
 418 //         sf = -7:  7 flats
 419 //         sf = -1:  1 flat
 420 //         sf = 0:  key of C
 421 //         sf = 1:  1 sharp
 422 //         sf = 7: 7 sharps
 423 //         mi = 0:  major key
 424 //         mi = 1:  minor key
 425
 426   number_ = 0;
 427
 428   char const* data_str0 = ""
 429     //        "00" "ff58" "0404" "0218" "08"
 430     //  "00" "ff51" "0307" "a120"
 431     // why a key at all, in midi?
 432     // key: C
 433     //  "00" "ff59" "02" "00" "00"
 434     // key: F (scsii-menuetto)
 435     //                            "00" "ff59" "02" "ff" "00"
 436         ;
 437
 438   String data_string;
 439   // only for format 0 (currently using format 1)?
 440   data_string += String_convert::hex2bin (data_str0);
 441
 442   char const* footer_str0 = "00" "ff2f" "00";
 443   String footer_string = String_convert::hex2bin (footer_str0);
 444
 445   set ("MTrk", data_string, footer_string);
 446 }
 447
 448 void
 449 Midi_track::add (Moment delta_time_mom, Midi_item* midi)
 450 {
 451   assert (delta_time_mom >= Moment (0));
 452
 453   Midi_event * e = new Midi_event (delta_time_mom, midi);
 454   event_p_list_.append (new Killing_cons<Midi_event> (e, 0));
 455 }
 456
 457 String
 458 Midi_track::data_string () const
 459 {
 460   String str = Midi_chunk::data_string ();
 461   if (midi_debug_global_b)
 462     str += "\n";
 463   for (Cons<Midi_event> *i=event_p_list_.head_; i; i = i->next_)
 464     {
 465       str += i->car_->to_string ();
 466       if (midi_debug_global_b)
 467         str += "\n";
 468     }
 469   return str;
 470 }