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--2003 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 Midi_item*
  23 Midi_item::get_midi (Audio_item* a)
  24 {
  25   if (Audio_key* i = dynamic_cast<Audio_key*> (a))
  26     return new Midi_key (i);
  27   else if (Audio_instrument* i = dynamic_cast<Audio_instrument*> (a))
  28     return i->str_.length () ? new Midi_instrument (i) : 0;
  29   else if (Audio_note* i = dynamic_cast<Audio_note*> (a))
  30     return new Midi_note (i);
  31   else if (Audio_dynamic* i = dynamic_cast<Audio_dynamic*> (a))
  32     return new Midi_dynamic (i);
  33   else if (Audio_piano_pedal* i = dynamic_cast<Audio_piano_pedal*> (a))
  34     return new Midi_piano_pedal (i);
  35   else if (Audio_tempo* i = dynamic_cast<Audio_tempo*> (a))
  36     return new Midi_tempo (i);
  37   else if (Audio_time_signature* i = dynamic_cast<Audio_time_signature*> (a))
  38     return new Midi_time_signature (i);
  39   else if (Audio_text* i = dynamic_cast<Audio_text*> (a))
  40     //return i->text_string_.length () ? new Midi_text (i) : 0;
  41     return new Midi_text (i);
  42   else
  43     assert (0);
  44
  45   // isn't C++ grand?
  46   return 0;
  47 }
  48
  49 void
  50 Midi_chunk::set (String header_string, String data_string, String footer_string)
  51 {
  52   data_string_ = data_string;
  53   footer_string_ = footer_string;
  54   header_string_ = header_string;
  55 }
  56
  57 String
  58 Midi_chunk::data_string () const
  59 {
  60   return data_string_;
  61 }
  62
  63 String
  64 Midi_chunk::to_string () const
  65 {
  66   String str = header_string_;
  67   String dat = data_string ();
  68   String length_string = String_convert::int2hex (dat.length ()
  69     + footer_string_.length (), 8, '0');
  70   length_string = String_convert::hex2bin (length_string);
  71   str += length_string;
  72   str += dat;
  73   str += footer_string_;
  74   return str;
  75 }
  76
  77 Midi_duration::Midi_duration (Real seconds_f)
  78 {
  79   seconds_ = seconds_f;
  80 }
  81
  82 String
  83 Midi_duration::to_string () const
  84 {
  85   return String ("<duration: ") + ::to_string (seconds_) + ">";
  86 }
  87
  88 Midi_event::Midi_event (Moment delta_mom, Midi_item* midi)
  89 {
  90   delta_mom_ = delta_mom;
  91   midi_ = midi;
  92 }
  93
  94 /*
  95   ugh. midi output badly broken since grace note hackage.
  96  */
  97 String
  98 Midi_event::to_string () const
  99 {
 100   Rational rat_dt = (delta_mom_.main_part_ * Rational (384) +
 101     delta_mom_.grace_part_ * Rational (100))*Rational (4);
 102   int delta_i = int (rat_dt);
 103
 104   String delta_string = Midi_item::i2varint_string (delta_i);
 105   String midi_string = midi_->to_string ();
 106   assert (midi_string.length ());
 107   return delta_string + midi_string;
 108 }
 109
 110
 111 Midi_header::Midi_header (int format_i, int tracks_i, int clocks_per_4_i)
 112 {
 113   String str;
 114
 115   String format_string = String_convert::int2hex (format_i, 4, '0');
 116   str += String_convert::hex2bin (format_string);
 117
 118   String tracks_string = String_convert::int2hex (tracks_i, 4, '0');
 119   str += String_convert::hex2bin (tracks_string);
 120
 121   String tempo_string = String_convert::int2hex (clocks_per_4_i, 4, '0');
 122   str += String_convert::hex2bin (tempo_string);
 123
 124   set ("MThd", str, "");
 125 }
 126
 127 Midi_instrument::Midi_instrument (Audio_instrument* a)
 128 {
 129   audio_ = a;
 130   audio_->str_.to_lower ();
 131 }
 132
 133 String
 134 Midi_instrument::to_string () const
 135 {
 136   Byte program_byte = 0;
 137   bool found = false;
 138
 139   /*
 140     UGH. don't use eval.
 141    */
 142   SCM proc = scm_primitive_eval (ly_symbol2scm ("midi-program"));
 143   SCM program = gh_call1 (proc, ly_symbol2scm (audio_->str_.to_str0 ()));
 144   found = (program != SCM_BOOL_F);
 145   if (found)
 146     program_byte = gh_scm2int(program);
 147   else
 148       warning (_f ("no such instrument: `%s'", audio_->str_.to_str0 ()));
 149
 150   String str = ::to_string ((char) (0xc0 + channel_)); //YIKES! FIXME: Should be track. -rz
 151   str += ::to_string ((char)program_byte);
 152   return str;
 153 }
 154
 155 Midi_item::Midi_item ()
 156 {
 157   channel_ = 0;
 158 }
 159
 160 Midi_item::~Midi_item ()
 161 {
 162 }
 163
 164 String
 165 Midi_item::i2varint_string (int i)
 166 {
 167   int buffer_i = i & 0x7f;
 168   while ((i >>= 7) > 0)
 169     {
 170       buffer_i <<= 8;
 171       buffer_i |= 0x80;
 172       buffer_i += (i & 0x7f);
 173     }
 174
 175   String str;
 176   while (1)
 177     {
 178       str += ::to_string ((char)buffer_i);
 179       if (buffer_i & 0x80)
 180         buffer_i >>= 8;
 181       else
 182         break;
 183     }
 184   return str;
 185 }
 186
 187 Midi_key::Midi_key (Audio_key*a)
 188 {
 189   audio_ = a;
 190 }
 191
 192 String
 193 Midi_key::to_string () const
 194 {
 195   String str = "ff5902";
 196   str += String_convert::int2hex (audio_->accidentals_, 2, '0');
 197   if (audio_->major_)
 198     str += String_convert::int2hex (0, 2, '0');
 199   else
 200     str += String_convert::int2hex (1, 2, '0');
 201   return String_convert::hex2bin (str);
 202 }
 203
 204 Midi_time_signature::Midi_time_signature (Audio_time_signature* a)
 205 {
 206   audio_ = a;
 207   clocks_per_1_ = 18;
 208 }
 209
 210 String
 211 Midi_time_signature::to_string () const
 212 {
 213   int num = audio_->beats_;
 214   int den = audio_->one_beat_;
 215
 216   String str = "ff5804";
 217   str += String_convert::int2hex (num, 2, '0');
 218   str += String_convert::int2hex (intlog2 (den) , 2, '0');
 219   str += String_convert::int2hex (clocks_per_1_, 2, '0');
 220   str += String_convert::int2hex (8, 2, '0');
 221   return String_convert::hex2bin (str);
 222 }
 223
 224 Midi_note::Midi_note (Audio_note* a)
 225 {
 226   audio_ = a;
 227   dynamic_byte_ = 0x7f;
 228 }
 229
 230 Moment
 231 Midi_note::get_length () const
 232 {
 233   Moment m = audio_->length_mom_;
 234 #if 0
 235   //junkme?
 236   if (m < Moment (Rational (1, 1000)))
 237     {
 238       warning (_ ("silly duration"));
 239       m = 1;
 240      }
 241 #endif
 242   return m;
 243 }
 244
 245 int
 246 Midi_note::get_pitch () const
 247 {
 248   int p = audio_->pitch_.semitone_pitch () + audio_->transposing_;
 249   if (p == INT_MAX)
 250     {
 251       warning (_ ("silly pitch"));
 252       p = 0;
 253      }
 254   return p;
 255 }
 256
 257 String
 258 Midi_note::to_string () const
 259 {
 260   Byte status_byte = (char) (0x90 + channel_);
 261
 262   String str = ::to_string ((char)status_byte);
 263   str += ::to_string ((char) (get_pitch () + c0_pitch_i_));
 264
 265   str += ::to_string ((char)dynamic_byte_);
 266   return str;
 267 }
 268
 269 Midi_note_off::Midi_note_off (Midi_note* n)
 270   : Midi_note (n->audio_)
 271 {
 272   on_ = n;
 273   channel_ = n->channel_;
 274
 275   // Anybody who hears any difference, or knows how this works?
 276   //  0 should definitely be avoided, notes stick on some sound cards.
 277   // 64 is supposed to be neutral
 278
 279   aftertouch_byte_ = 64;
 280 }
 281
 282 String
 283 Midi_note_off::to_string () const
 284 {
 285   Byte status_byte = (char) (0x80 + channel_);
 286
 287   String str = ::to_string ((char)status_byte);
 288   str += ::to_string ((char) (get_pitch () + Midi_note::c0_pitch_i_));
 289   str += ::to_string ((char)aftertouch_byte_);
 290   return str;
 291 }
 292
 293 Midi_dynamic::Midi_dynamic (Audio_dynamic* a)
 294 {
 295   audio_ = a;
 296 }
 297
 298 String
 299 Midi_dynamic::to_string () const
 300 {
 301   Byte status_byte = (char) (0xB0 + channel_);
 302   String str = ::to_string ((char)status_byte);
 303
 304   /*
 305     Main volume controller (per channel):
 306     07 MSB
 307     27 LSB
 308    */
 309   static Real const full_scale = 127;
 310
 311   int volume = (int) (audio_->volume_*full_scale);
 312   if (volume <= 0)
 313     volume = 1;
 314   if (volume > full_scale)
 315     volume = (int)full_scale;
 316
 317   str += ::to_string ((char)0x07);
 318   str += ::to_string ((char)volume);
 319   return str;
 320 }
 321
 322 Midi_piano_pedal::Midi_piano_pedal (Audio_piano_pedal* a)
 323 {
 324   audio_ = a;
 325 }
 326
 327 String
 328 Midi_piano_pedal::to_string () const
 329 {
 330   Byte status_byte = (char) (0xB0 + channel_);
 331   String str = ::to_string ((char)status_byte);
 332
 333   if (audio_->type_string_ == "Sostenuto")
 334     str += ::to_string ((char)0x42);
 335   else if (audio_->type_string_ == "Sustain")
 336     str += ::to_string ((char)0x40);
 337   else if (audio_->type_string_ == "UnaCorda")
 338     str += ::to_string ((char)0x43);
 339
 340   int pedal = ((1 - audio_->dir_) / 2) * 0x7f;
 341   str += ::to_string ((char)pedal);
 342   return str;
 343 }
 344
 345 Midi_tempo::Midi_tempo (Audio_tempo* a)
 346 {
 347   audio_ = a;
 348 }
 349
 350 String
 351 Midi_tempo::to_string () const
 352 {
 353   int useconds_per_4_i = 60 * (int)1e6 / audio_->per_minute_4_;
 354   String str = "ff5103";
 355   str += String_convert::int2hex (useconds_per_4_i, 6, '0');
 356   return String_convert::hex2bin (str);
 357 }
 358
 359 Midi_text::Midi_text (Audio_text* a)
 360 {
 361   audio_ = a;
 362 }
 363
 364 String
 365 Midi_text::to_string () const
 366 {
 367   String str = "ff" + String_convert::int2hex (audio_->type_, 2, '0');
 368   str = String_convert::hex2bin (str);
 369   str += i2varint_string (audio_->text_string_.length ());
 370   str += audio_->text_string_;
 371   return str;
 372 }
 373
 374 Midi_track::Midi_track ()
 375   : Midi_chunk ()
 376 {
 377   //                4D 54 72 6B     MTrk
 378   //                00 00 00 3B     chunk length (59)
 379   //        00      FF 58 04 04 02 18 08    time signature
 380   //        00      FF 51 03 07 A1 20       tempo
 381
 382 // FF 59 02 sf mi  Key Signature
 383 //         sf = -7:  7 flats
 384 //         sf = -1:  1 flat
 385 //         sf = 0:  key of C
 386 //         sf = 1:  1 sharp
 387 //         sf = 7: 7 sharps
 388 //         mi = 0:  major key
 389 //         mi = 1:  minor key
 390
 391   number_ = 0;
 392
 393   char const* data_str0 = ""
 394     //        "00" "ff58" "0404" "0218" "08"
 395     //  "00" "ff51" "0307" "a120"
 396     // why a key at all, in midi?
 397     // key: C
 398     //  "00" "ff59" "02" "00" "00"
 399     // key: F (scsii-menuetto)
 400     //                            "00" "ff59" "02" "ff" "00"
 401         ;
 402
 403   String data_string;
 404   // only for format 0 (currently using format 1)?
 405   data_string += String_convert::hex2bin (data_str0);
 406
 407   char const* footer_str0 = "00" "ff2f" "00";
 408   String footer_string = String_convert::hex2bin (footer_str0);
 409
 410   set ("MTrk", data_string, footer_string);
 411 }
 412
 413 void
 414 Midi_track::add (Moment delta_time_mom, Midi_item* midi)
 415 {
 416   assert (delta_time_mom >= Moment (0));
 417
 418   Midi_event * e = new Midi_event (delta_time_mom, midi);
 419   event_p_list_.append (new Killing_cons<Midi_event> (e, 0));
 420 }
 421
 422 String
 423 Midi_track::data_string () const
 424 {
 425   String str = Midi_chunk::data_string ();
 426   if (midi_debug_global_b)
 427     str += "\n";
 428   for (Cons<Midi_event> *i=event_p_list_.head_; i; i = i->next_)
 429     {
 430       str += i->car_->to_string ();
 431       if (midi_debug_global_b)
 432         str += "\n";
 433     }
 434   return str;
 435 }