scripts/midi2ly.py

   1 #!@TARGET_PYTHON@
   2 #
   3 # midi2ly.py -- LilyPond midi import script
   4
   5 # This file is part of LilyPond, the GNU music typesetter.
   6 #
   7 # Copyright (C) 1998--2011  Han-Wen Nienhuys <hanwen@xs4all.nl>
   8 #                           Jan Nieuwenhuizen <janneke@gnu.org>
   9 #
  10 # LilyPond is free software: you can redistribute it and/or modify
  11 # it under the terms of the GNU General Public License as published by
  12 # the Free Software Foundation, either version 3 of the License, or
  13 # (at your option) any later version.
  14 #
  15 # LilyPond is distributed in the hope that it will be useful,
  16 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 # GNU General Public License for more details.
  19 #
  20 # You should have received a copy of the GNU General Public License
  21 # along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  22
  23
  24 '''
  25 TODO:
  26     * test on weird and unquantised midi input (lily-devel)
  27     * update doc and manpage
  28
  29     * simply insert clef changes whenever too many ledger lines
  30         [to avoid tex capacity exceeded]
  31     * do not ever quant skips
  32     * better lyrics handling
  33     * [see if it is feasible to] move ly-classes to library for use in
  34         other converters, while leaving midi specific stuff here
  35 '''
  36
  37 import os
  38 import sys
  39
  40 """
  41 @relocate-preamble@
  42 """
  43
  44 import midi
  45 import lilylib as ly
  46 global _;_=ly._
  47
  48 ################################################################
  49 ## CONSTANTS
  50
  51
  52 LINE_BELL = 60
  53 scale_steps = [0, 2, 4, 5, 7, 9, 11]
  54 global_options = None
  55
  56 clocks_per_1 = 1536
  57 clocks_per_4 = 0
  58
  59 time = 0
  60 reference_note = 0
  61 start_quant_clocks = 0
  62
  63 duration_quant_clocks = 0
  64 allowed_tuplet_clocks = []
  65 bar_max = 0
  66
  67 ################################################################
  68
  69
  70 program_name = sys.argv[0]
  71 program_version = '@TOPLEVEL_VERSION@'
  72
  73 authors = ('Jan Nieuwenhuizen <janneke@gnu.org>',
  74            'Han-Wen Nienhuys <hanwen@xs4all.nl>')
  75
  76 errorport = sys.stderr
  77
  78 def identify ():
  79     sys.stdout.write ('%s (GNU LilyPond) %s\n' % (program_name, program_version))
  80
  81 def warranty ():
  82     identify ()
  83     ly.encoded_write (sys.stdout, '''
  84 %s
  85
  86   %s
  87
  88 %s
  89 %s
  90 ''' % ( _ ('Copyright (c) %s by') % '1998--2011',
  91         '\n  '.join (authors),
  92         _ ('Distributed under terms of the GNU General Public License.'),
  93         _ ('It comes with NO WARRANTY.')))
  94
  95 def progress (s):
  96     ly.encoded_write (errorport, s + '\n')
  97
  98 def warning (s):
  99     progress (_ ("warning: ") + s)
 100
 101 def error (s):
 102     progress (_ ("error: ") + s)
 103     raise Exception (_ ("Exiting... "))
 104
 105 def debug (s):
 106     if 0:
 107         progress ("debug: " + s)
 108
 109 def system (cmd, ignore_error = 0):
 110     return ly.system (cmd, ignore_error=ignore_error)
 111
 112 def strip_extension (f, ext):
 113     (p, e) = os.path.splitext (f)
 114     if e == ext:
 115         e = ''
 116     return p + e
 117
 118
 119 class Duration:
 120     allowed_durs = (1, 2, 4, 8, 16, 32, 64, 128)
 121     def __init__ (self, clocks):
 122         self.clocks = clocks
 123         if clocks <= 0:
 124             self.clocks = duration_quant_clocks
 125         (self.dur, self.num, self.den) = self.dur_num_den (clocks)
 126
 127     def dur_num_den (self, clocks):
 128         for i in range (len (allowed_tuplet_clocks)):
 129             if clocks == allowed_tuplet_clocks[i]:
 130                 return global_options.allowed_tuplets[i]
 131
 132         dur = 0; num = 1; den = 1;
 133         g = gcd (clocks, clocks_per_1)
 134         if g:
 135             (dur, num) = (clocks_per_1 / g, clocks / g)
 136         if not dur in self.allowed_durs:
 137             dur = 4; num = clocks; den = clocks_per_4
 138         return (dur, num, den)
 139
 140     def dump (self):
 141         if self.den == 1:
 142             if self.num == 1:
 143                 s = '%d' % self.dur
 144             elif self.num == 3 and self.dur != 1:
 145                 s = '%d.' % (self.dur / 2)
 146             else:
 147                 s = '%d*%d' % (self.dur, self.num)
 148         else:
 149             s = '%d*%d/%d' % (self.dur, self.num, self.den)
 150
 151         global reference_note
 152         reference_note.duration = self
 153
 154         return s
 155
 156     def compare (self, other):
 157         return self.clocks - other.clocks
 158
 159 def sign (x):
 160     if x >= 0:
 161         return 1
 162     else:
 163         return -1
 164
 165 class Note:
 166     names = (0, 0, 1, 1, 2, 3, 3, 4, 4, 5, 5, 6)
 167     alterations = (0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0)
 168     alteration_names = ('eses', 'es', '', 'is' , 'isis')
 169     def __init__ (self, clocks, pitch, velocity):
 170         self.pitch = pitch
 171         self.velocity = velocity
 172         # hmm
 173         self.clocks = clocks
 174         self.duration = Duration (clocks)
 175         (self.octave, self.notename, self.alteration) = self.o_n_a ()
 176
 177     def o_n_a (self):
 178         # major scale: do-do
 179         # minor scale: la-la  (= + 5) '''
 180
 181         n = self.names[(self.pitch) % 12]
 182         a = self.alterations[(self.pitch) % 12]
 183
 184         if a and global_options.key.flats:
 185             a = - self.alterations[(self.pitch) % 12]
 186             n = (n - a) % 7
 187
 188         #  By tradition, all scales now consist of a sequence
 189         #  of 7 notes each with a distinct name, from amongst
 190         #  a b c d e f g.  But, minor scales have a wide
 191         #  second interval at the top - the 'leading note' is
 192         #  sharped. (Why? it just works that way! Anything
 193         #  else doesn't sound as good and isn't as flexible at
 194         #  saying things. In medieval times, scales only had 6
 195         #  notes to avoid this problem - the hexachords.)
 196
 197         #  So, the d minor scale is d e f g a b-flat c-sharp d
 198         #  - using d-flat for the leading note would skip the
 199         #  name c and duplicate the name d.  Why isn't c-sharp
 200         #  put in the key signature? Tradition. (It's also
 201         #  supposedly based on the Pythagorean theory of the
 202         #  cycle of fifths, but that really only applies to
 203         #  major scales...)  Anyway, g minor is g a b-flat c d
 204         #  e-flat f-sharp g, and all the other flat minor keys
 205         #  end up with a natural leading note. And there you
 206         #  have it.
 207
 208         #  John Sankey <bf250@freenet.carleton.ca>
 209         #
 210         #  Let's also do a-minor: a b c d e f gis a
 211         #
 212         #  --jcn
 213
 214         o = self.pitch / 12 - 4
 215
 216         key = global_options.key
 217         if key.minor:
 218             # as -> gis
 219             if (key.sharps == 0 and key.flats == 0
 220                 and n == 5 and a == -1):
 221                 n = 4; a = 1
 222             # des -> cis
 223             elif key.flats == 1 and n == 1 and a == -1:
 224                 n = 0; a = 1
 225             # ges -> fis
 226             elif key.flats == 2 and n == 4 and a == -1:
 227                 n = 3; a = 1
 228             # g -> fisis
 229             elif key.sharps == 5 and n == 4 and a == 0:
 230                 n = 3; a = 2
 231             # d -> cisis
 232             elif key.sharps == 6 and n == 1 and a == 0:
 233                 n = 0; a = 2
 234             # a -> gisis
 235             elif key.sharps == 7 and n == 5 and a == 0:
 236                 n = 4; a = 2
 237
 238         # b -> ces
 239         if key.flats >= 6 and n == 6 and a == 0:
 240             n = 0; a = -1; o = o + 1
 241         # e -> fes
 242         if key.flats >= 7 and n == 2 and a == 0:
 243             n = 3; a = -1
 244
 245         # f -> eis
 246         if key.sharps >= 3 and n == 3 and a == 0:
 247             n = 2; a = 1
 248         # c -> bis
 249         if key.sharps >= 4 and n == 0 and a == 0:
 250             n = 6; a = 1; o = o - 1
 251
 252         return (o, n, a)
 253
 254     def __repr__ (self):
 255         s = chr ((self.notename + 2)  % 7 + ord ('a'))
 256         return 'Note(%s %s)' % (s, self.duration.dump ())
 257
 258     def dump (self, dump_dur=True):
 259         global reference_note
 260         s = chr ((self.notename + 2)  % 7 + ord ('a'))
 261         s = s + self.alteration_names[self.alteration + 2]
 262         if global_options.absolute_pitches:
 263             commas = self.octave
 264         else:
 265             delta = self.pitch - reference_note.pitch
 266             commas = sign (delta) * (abs (delta) / 12)
 267             if (((sign (delta)
 268                   * (self.notename - reference_note.notename) + 7)
 269                  % 7 >= 4)
 270                 or ((self.notename == reference_note.notename)
 271                     and (abs (delta) > 4) and (abs (delta) < 12))):
 272                 commas = commas + sign (delta)
 273
 274         if commas > 0:
 275             s = s + "'" * commas
 276         elif commas < 0:
 277             s = s + "," * -commas
 278
 279         if ((dump_dur
 280              and self.duration.compare (reference_note.duration))
 281             or global_options.explicit_durations):
 282             s = s + self.duration.dump ()
 283
 284         reference_note = self
 285
 286         # TODO: move space
 287         return s + ' '
 288
 289
 290 class Time:
 291     def __init__ (self, num, den):
 292         self.clocks = 0
 293         self.num = num
 294         self.den = den
 295
 296     def bar_clocks (self):
 297         return clocks_per_1 * self.num / self.den
 298
 299     def __repr__ (self):
 300         return 'Time(%d/%d)' % (self.num, self.den)
 301
 302     def dump (self):
 303         global time
 304         time = self
 305         return '\n  ' + '\\time %d/%d ' % (self.num, self.den) + '\n  '
 306
 307 class Tempo:
 308     def __init__ (self, seconds_per_1):
 309         self.clocks = 0
 310         self.seconds_per_1 = seconds_per_1
 311
 312     def __repr__ (self):
 313         return 'Tempo(%d)' % self.bpm ()
 314
 315     def bpm (self):
 316         return 4 * 60 / self.seconds_per_1
 317
 318     def dump (self):
 319         return '\n  ' + '\\tempo 4 = %d ' % (self.bpm ()) + '\n  '
 320
 321 class Clef:
 322     clefs = ('"bass_8"', 'bass', 'violin', '"violin^8"')
 323     def __init__ (self, type):
 324         self.type = type
 325
 326     def __repr__ (self):
 327         return 'Clef(%s)' % self.clefs[self.type]
 328
 329     def dump (self):
 330         return '\n  \\clef %s\n  ' % self.clefs[self.type]
 331
 332 class Key:
 333     key_sharps = ('c', 'g', 'd', 'a', 'e', 'b', 'fis')
 334     key_flats = ('BUG', 'f', 'bes', 'es', 'as', 'des', 'ges')
 335
 336     def __init__ (self, sharps, flats, minor):
 337         self.clocks = 0
 338         self.flats = flats
 339         self.sharps = sharps
 340         self.minor = minor
 341
 342     def dump (self):
 343         global_options.key = self
 344
 345         s = ''
 346         if self.sharps and self.flats:
 347             pass
 348         else:
 349             if self.flats:
 350                 k = (ord ('cfbeadg'[self.flats % 7]) - ord ('a') - 2 -2 * self.minor + 7) % 7
 351             else:
 352                 k = (ord ('cgdaebf'[self.sharps % 7]) - ord ('a') - 2 -2 * self.minor + 7) % 7
 353
 354             if not self.minor:
 355                 name = chr ((k + 2) % 7 + ord ('a'))
 356             else:
 357                 name = chr ((k + 2) % 7 + ord ('a'))
 358
 359             # fis cis gis dis ais eis bis
 360             sharps = (2, 4, 6, 1, 3, 5, 7)
 361             # bes es as des ges ces fes
 362             flats = (6, 4, 2, 7, 5, 3, 1)
 363             a = 0
 364             if self.flats:
 365                 if flats[k] <= self.flats:
 366                     a = -1
 367             else:
 368                 if sharps[k] <= self.sharps:
 369                     a = 1
 370
 371             if a:
 372                 name = name + Note.alteration_names[a + 2]
 373
 374             s = '\\key ' + name
 375             if self.minor:
 376                 s = s + ' \\minor'
 377             else:
 378                 s = s + ' \\major'
 379
 380         return '\n\n  ' + s + '\n  '
 381
 382
 383 class Text:
 384     text_types = (
 385         'SEQUENCE_NUMBER',
 386         'TEXT_EVENT',
 387         'COPYRIGHT_NOTICE',
 388         'SEQUENCE_TRACK_NAME',
 389         'INSTRUMENT_NAME',
 390         'LYRIC',
 391         'MARKER',
 392         'CUE_POINT',)
 393
 394     def __init__ (self, type, text):
 395         self.clocks = 0
 396         self.type = type
 397         self.text = text
 398
 399     def dump (self):
 400         # urg, we should be sure that we're in a lyrics staff
 401         if self.type == midi.LYRIC:
 402             s = '"%s"' % self.text
 403             d = Duration (self.clocks)
 404             if (global_options.explicit_durations
 405                 or d.compare (reference_note.duration)):
 406                 s = s + Duration (self.clocks).dump ()
 407             s = s + ' '
 408         else:
 409             s = '\n  % [' + self.text_types[self.type] + '] ' + self.text + '\n  '
 410         return s
 411
 412     def __repr__ (self):
 413         return 'Text(%d=%s)' % (self.type, self.text)
 414
 415
 416
 417 def split_track (track):
 418     chs = {}
 419     for i in range (16):
 420         chs[i] = []
 421
 422     for e in track:
 423         data = list (e[1])
 424         if data[0] > 0x7f and data[0] < 0xf0:
 425             c = data[0] & 0x0f
 426             e = (e[0], tuple ([data[0] & 0xf0] + data[1:]))
 427             chs[c].append (e)
 428         else:
 429             chs[0].append (e)
 430
 431     for i in range (16):
 432         if chs[i] == []:
 433             del chs[i]
 434
 435     threads = []
 436     for v in chs.values ():
 437         events = events_on_channel (v)
 438         t = unthread_notes (events)
 439         if len (t):
 440             threads.append (t)
 441     return threads
 442
 443 def quantise_clocks (clocks, quant):
 444     q = int (clocks / quant) * quant
 445     if q != clocks:
 446         for tquant in allowed_tuplet_clocks:
 447             if int (clocks / tquant) * tquant == clocks:
 448                 return clocks
 449         if 2 * (clocks - q) > quant:
 450             q = q + quant
 451     return q
 452
 453 def end_note (pitches, notes, t, e):
 454     try:
 455         (lt, vel) = pitches[e]
 456         del pitches[e]
 457
 458         i = len (notes) - 1
 459         while i > 0:
 460             if notes[i][0] > lt:
 461                 i = i -1
 462             else:
 463                 break
 464         d = t - lt
 465         if duration_quant_clocks:
 466             d = quantise_clocks (d, duration_quant_clocks)
 467             if not d:
 468                 d = duration_quant_clocks
 469
 470         notes.insert (i + 1,
 471               (lt, Note (d, e, vel)))
 472
 473     except KeyError:
 474         pass
 475
 476 def events_on_channel (channel):
 477     pitches = {}
 478
 479     notes = []
 480     events = []
 481     last_lyric = 0
 482     last_time = 0
 483     for e in channel:
 484         t = e[0]
 485
 486         if start_quant_clocks:
 487             t = quantise_clocks (t, start_quant_clocks)
 488
 489
 490         if (e[1][0] == midi.NOTE_OFF
 491             or (e[1][0] == midi.NOTE_ON and e[1][2] == 0)):
 492             debug ('%d: NOTE OFF: %s' % (t, e[1][1]))
 493             if not e[1][2]:
 494                 debug ('   ...treated as OFF')
 495             end_note (pitches, notes, t, e[1][1])
 496
 497         elif e[1][0] == midi.NOTE_ON:
 498             if not pitches.has_key (e[1][1]):
 499                 debug ('%d: NOTE ON: %s' % (t, e[1][1]))
 500                 pitches[e[1][1]] = (t, e[1][2])
 501             else:
 502                 debug ('...ignored')
 503
 504         # all include ALL_NOTES_OFF
 505         elif (e[1][0] >= midi.ALL_SOUND_OFF
 506           and e[1][0] <= midi.POLY_MODE_ON):
 507             for i in pitches:
 508                 end_note (pitches, notes, t, i)
 509
 510         elif e[1][0] == midi.META_EVENT:
 511             if e[1][1] == midi.END_OF_TRACK:
 512                 for i in pitches:
 513                     end_note (pitches, notes, t, i)
 514                 break
 515
 516             elif e[1][1] == midi.SET_TEMPO:
 517                 (u0, u1, u2) = map (ord, e[1][2])
 518                 us_per_4 = u2 + 256 * (u1 + 256 * u0)
 519                 seconds_per_1 = us_per_4 * 4 / 1e6
 520                 events.append ((t, Tempo (seconds_per_1)))
 521             elif e[1][1] == midi.TIME_SIGNATURE:
 522                 (num, dur, clocks4, count32) = map (ord, e[1][2])
 523                 den = 2 ** dur
 524                 events.append ((t, Time (num, den)))
 525             elif e[1][1] == midi.KEY_SIGNATURE:
 526                 (alterations, minor) = map (ord, e[1][2])
 527                 sharps = 0
 528                 flats = 0
 529                 if alterations < 127:
 530                     sharps = alterations
 531                 else:
 532                     flats = 256 - alterations
 533
 534                 k = Key (sharps, flats, minor)
 535                 events.append ((t, k))
 536
 537                 # ugh, must set key while parsing
 538                 # because Note init uses key
 539                 # Better do Note.calc () at dump time?
 540                 global_options.key = k
 541
 542             elif (e[1][1] == midi.LYRIC
 543                   or (global_options.text_lyrics and e[1][1] == midi.TEXT_EVENT)):
 544                 if last_lyric:
 545                     last_lyric.clocks = t - last_time
 546                     events.append ((last_time, last_lyric))
 547                 last_time = t
 548                 last_lyric = Text (midi.LYRIC, e[1][2])
 549
 550             elif (e[1][1] >= midi.SEQUENCE_NUMBER
 551                   and e[1][1] <= midi.CUE_POINT):
 552                 events.append ((t, Text (e[1][1], e[1][2])))
 553             else:
 554                 if global_options.verbose:
 555                     sys.stderr.write ("SKIP: %s\n" % `e`)
 556                 pass
 557         else:
 558             if global_options.verbose:
 559                 sys.stderr.write ("SKIP: %s\n" % `e`)
 560             pass
 561
 562     if last_lyric:
 563         # last_lyric.clocks = t - last_time
 564         # hmm
 565         last_lyric.clocks = clocks_per_4
 566         events.append ((last_time, last_lyric))
 567         last_lyric = 0
 568
 569     i = 0
 570     while len (notes):
 571         if i < len (events) and notes[0][0] >= events[i][0]:
 572             i = i + 1
 573         else:
 574             events.insert (i, notes[0])
 575             del notes[0]
 576     return events
 577
 578 def unthread_notes (channel):
 579     threads = []
 580     while channel:
 581         thread = []
 582         end_busy_t = 0
 583         start_busy_t = 0
 584         todo = []
 585         for e in channel:
 586             t = e[0]
 587             if (e[1].__class__ == Note
 588                 and ((t == start_busy_t
 589                       and e[1].clocks + t == end_busy_t)
 590                      or t >= end_busy_t)):
 591                 thread.append (e)
 592                 start_busy_t = t
 593                 end_busy_t = t + e[1].clocks
 594             elif (e[1].__class__ == Time
 595                   or e[1].__class__ == Key
 596                   or e[1].__class__ == Text
 597                   or e[1].__class__ == Tempo):
 598                 thread.append (e)
 599             else:
 600                 todo.append (e)
 601         threads.append (thread)
 602         channel = todo
 603
 604     return threads
 605
 606 def gcd (a,b):
 607     if b == 0:
 608         return a
 609     c = a
 610     while c:
 611         c = a % b
 612         a = b
 613         b = c
 614     return a
 615
 616 def dump_skip (skip, clocks):
 617     return skip + Duration (clocks).dump () + ' '
 618
 619 def dump (d):
 620     return d.dump ()
 621
 622 def dump_chord (ch):
 623     s = ''
 624     notes = []
 625     for i in ch:
 626         if i.__class__ == Note:
 627             notes.append (i)
 628         else:
 629             s = s + i.dump ()
 630     if len (notes) == 1:
 631         s = s + dump (notes[0])
 632     elif len (notes) > 1:
 633         global reference_note
 634         s = s + '<'
 635         s = s + notes[0].dump (dump_dur=False)
 636         r = reference_note
 637         for i in notes[1:]:
 638             s = s + i.dump (dump_dur=False)
 639         s = s + '>'
 640
 641         s = s + notes[0].duration.dump () + ' '
 642         reference_note = r
 643     return s
 644
 645 def dump_bar_line (last_bar_t, t, bar_count):
 646     s = ''
 647     bar_t = time.bar_clocks ()
 648     if t - last_bar_t >= bar_t:
 649         bar_count = bar_count + (t - last_bar_t) / bar_t
 650
 651         if t - last_bar_t == bar_t:
 652             s = '|\n  %% %d\n  ' % bar_count
 653             last_bar_t = t
 654         else:
 655             # urg, this will barf at meter changes
 656             last_bar_t = last_bar_t + (t - last_bar_t) / bar_t * bar_t
 657
 658     return (s, last_bar_t, bar_count)
 659
 660
 661 def dump_voice (thread, skip):
 662     global reference_note, time
 663
 664     global_options.key = Key (0, 0, 0)
 665     time = Time (4, 4)
 666     # urg LilyPond doesn't start at c4, but
 667     # remembers from previous tracks!
 668     # reference_note = Note (clocks_per_4, 4*12, 0)
 669     if not reference_note:
 670         reference_note = Note (0, 4*12, 0)
 671     last_e = None
 672     chs = []
 673     ch = []
 674
 675     for e in thread:
 676         if last_e and last_e[0] == e[0]:
 677             ch.append (e[1])
 678         else:
 679             if ch:
 680                 chs.append ((last_e[0], ch))
 681
 682             ch = [e[1]]
 683
 684         last_e = e
 685
 686     if ch:
 687         chs.append ((last_e[0], ch))
 688     t = 0
 689     last_t = 0
 690     last_bar_t = 0
 691     bar_count = 1
 692
 693     lines = ['']
 694     for ch in chs:
 695         t = ch[0]
 696
 697         i = lines[-1].rfind ('\n') + 1
 698         if len (lines[-1][i:]) > LINE_BELL:
 699             lines.append ('')
 700
 701         if t - last_t > 0:
 702             d = t - last_t
 703             if bar_max and t > time.bar_clocks () * bar_max:
 704                 d = time.bar_clocks () * bar_max - last_t
 705             lines[-1] = lines[-1] + dump_skip (skip, d)
 706         elif t - last_t < 0:
 707             errorport.write ('BUG: time skew')
 708
 709         (s, last_bar_t, bar_count) = dump_bar_line (last_bar_t,
 710                               t, bar_count)
 711
 712         if bar_max and bar_count > bar_max:
 713             break
 714
 715         lines[-1] = lines[-1] + s
 716         lines[-1] = lines[-1] + dump_chord (ch[1])
 717
 718         clocks = 0
 719         for i in ch[1]:
 720             if i.clocks > clocks:
 721                 clocks = i.clocks
 722
 723         last_t = t + clocks
 724
 725         (s, last_bar_t, bar_count) = dump_bar_line (last_bar_t,
 726                                                     last_t, bar_count)
 727         lines[-1] = lines[-1] + s
 728
 729     return '\n  '.join (lines) + '\n'
 730
 731 def number2ascii (i):
 732     s = ''
 733     i += 1
 734     while i > 0:
 735         m = (i - 1) % 26
 736         s = '%c' % (m + ord ('A')) + s
 737         i = (i - m)/26
 738     return s
 739
 740 def get_track_name (i):
 741     return 'track' + number2ascii (i)
 742
 743 def get_channel_name (i):
 744     return 'channel' + number2ascii (i)
 745
 746 def get_voice_name (i):
 747     if True: #i:
 748         return 'voice' + number2ascii (i)
 749     return ''
 750
 751 def dump_track (track, n):
 752     s = '\n'
 753     track_name = get_track_name (n)
 754     clef = guess_clef (track)
 755
 756     c = 0
 757     for channel in track:
 758         channel_name = get_channel_name (c)
 759         c += 1
 760         v = 0
 761         for voice in channel:
 762             voice_name = get_voice_name (v)
 763             voice_id = track_name + channel_name + voice_name
 764             item = voice_first_item (voice)
 765
 766             if item and item.__class__ == Note:
 767                 skip = 's'
 768                 s += '%(voice_id)s = ' % locals ()
 769                 if not global_options.absolute_pitches:
 770                     s += '\\relative c '
 771             elif item and item.__class__ == Text:
 772                 skip = '" "'
 773                 s += '%(voice_id)s = \\lyricmode ' % locals ()
 774             else:
 775                 skip = '\\skip '
 776                 s += '%(voice_id)s = ' % locals ()
 777             s += '{\n'
 778             if len (channel) > 1 and v < 4:
 779                 s += '\\voice' + ['One', 'Two', 'Three', 'Four'][v]
 780             s += '  ' + dump_voice (voice, skip)
 781             s += '}\n\n'
 782             v += 1
 783
 784     s += '%(track_name)s = <<\n' % locals ()
 785
 786     if clef.type != 2:
 787         s += clef.dump () + '\n'
 788
 789     c = 0
 790     for channel in track:
 791         channel_name = get_channel_name (c)
 792         c += 1
 793         v = 0
 794         for voice in channel:
 795             voice_name = get_voice_name (v)
 796             v += 1
 797             voice_id = track_name + channel_name + voice_name
 798             item = voice_first_item (voice)
 799             context = 'Voice'
 800             if item and item.__class__ == Text:
 801                 context = 'Lyrics'
 802             s += '  \\context %(context)s = %(voice_name)s \\%(voice_id)s\n' % locals ()
 803     s += '>>\n\n'
 804     return s
 805
 806 def voice_first_item (voice):
 807     for event in voice:
 808         if (event[1].__class__ == Note
 809             or (event[1].__class__ == Text
 810                 and event[1].type == midi.LYRIC)):
 811             return event[1]
 812     return None
 813
 814 def channel_first_item (channel):
 815     for voice in channel:
 816         first = voice_first_item (voice)
 817         if first:
 818             return first
 819     return None
 820
 821 def track_first_item (track):
 822     for channel in track:
 823         first = channel_first_item (channel)
 824         if first:
 825             return first
 826     return None
 827
 828 def guess_clef (track):
 829     i = 0
 830     p = 0
 831     for voice in track:
 832         for thread in voice:
 833             for event in thread:
 834                 if event[1].__class__ == Note:
 835                     i = i + 1
 836                     p = p + event[1].pitch
 837     if i and p / i <= 3*12:
 838         return Clef (0)
 839     elif i and p / i <= 5*12:
 840         return Clef (1)
 841     elif i and p / i >= 7*12:
 842         return Clef (3)
 843     else:
 844         return Clef (2)
 845
 846
 847 def convert_midi (in_file, out_file):
 848     global clocks_per_1, clocks_per_4, key
 849     global start_quant_clocks
 850     global duration_quant_clocks
 851     global allowed_tuplet_clocks
 852
 853     str = open (in_file, 'rb').read ()
 854     clocks_max = bar_max * clocks_per_1 * 2
 855     midi_dump = midi.parse (str, clocks_max)
 856
 857     clocks_per_1 = midi_dump[0][1]
 858     clocks_per_4 = clocks_per_1 / 4
 859
 860     if global_options.start_quant:
 861         start_quant_clocks = clocks_per_1 / global_options.start_quant
 862
 863     if global_options.duration_quant:
 864         duration_quant_clocks = clocks_per_1 / global_options.duration_quant
 865
 866     allowed_tuplet_clocks = []
 867     for (dur, num, den) in global_options.allowed_tuplets:
 868         allowed_tuplet_clocks.append (clocks_per_1 / dur * num / den)
 869
 870     if global_options.verbose:
 871         print 'allowed tuplet clocks:', allowed_tuplet_clocks
 872
 873     tracks = []
 874     for t in midi_dump[1]:
 875         global_options.key = Key (0, 0, 0)
 876         tracks.append (split_track (t))
 877
 878     tag = '%% Lily was here -- automatically converted by %s from %s' % ( program_name, in_file)
 879
 880
 881     s = ''
 882     s = tag + '\n\\version "2.7.38"\n\n'
 883     for i in range (len (tracks)):
 884         s = s + dump_track (tracks[i], i)
 885
 886     s = s + '\n\\score {\n  <<\n'
 887
 888     i = 0
 889     for t in tracks:
 890         track_name = get_track_name (i)
 891         item = track_first_item (t)
 892
 893         if item and item.__class__ == Note:
 894             s += '    \\context Staff=%(track_name)s \\%(track_name)s\n' % locals ()
 895         elif item and item.__class__ == Text:
 896             s += '    \\context Lyrics=%(track_name)s \\%(track_name)s\n' % locals ()
 897
 898         i += 1
 899     s = s + '  >>\n}\n'
 900
 901     progress (_ ("%s output to `%s'...") % ('LY', out_file))
 902
 903     if out_file == '-':
 904         handle = sys.stdout
 905     else:
 906         handle = open (out_file, 'w')
 907
 908     handle.write (s)
 909     handle.close ()
 910
 911
 912 def get_option_parser ():
 913     p = ly.get_option_parser (usage=_ ("%s [OPTION]... FILE") % 'midi2ly',
 914                  description=_ ("Convert %s to LilyPond input.\n") % 'MIDI',
 915                  add_help_option=False)
 916
 917     p.add_option ('-a', '--absolute-pitches',
 918            action='store_true',
 919            help=_ ('print absolute pitches'))
 920     p.add_option ('-d', '--duration-quant',
 921            metavar=_ ('DUR'),
 922            help=_ ('quantise note durations on DUR'))
 923     p.add_option ('-e', '--explicit-durations',
 924            action='store_true',
 925            help=_ ('print explicit durations'))
 926     p.add_option('-h', '--help',
 927                  action='help',
 928                  help=_ ('show this help and exit'))
 929     p.add_option('-k', '--key', help=_ ('set key: ALT=+sharps|-flats; MINOR=1'),
 930           metavar=_ ('ALT[:MINOR]'),
 931           default='0'),
 932     p.add_option ('-o', '--output', help=_ ('write output to FILE'),
 933            metavar=_ ('FILE'),
 934            action='store')
 935     p.add_option ('-p', '--preview', help=_ ('preview of first 4 bars'),
 936            action='store_true')
 937     p.add_option ('-s', '--start-quant',help= _ ('quantise note starts on DUR'),
 938            metavar=_ ('DUR'))
 939     p.add_option ('-t', '--allow-tuplet',
 940            metavar=_ ('DUR*NUM/DEN'),
 941            action = 'append',
 942            dest='allowed_tuplets',
 943            help=_ ('allow tuplet durations DUR*NUM/DEN'),
 944            default=[])
 945     p.add_option ('-V', '--verbose', help=_ ('be verbose'),
 946            action='store_true'
 947            ),
 948     p.version = 'midi2ly (LilyPond) @TOPLEVEL_VERSION@'
 949     p.add_option ('--version',
 950                  action='version',
 951                  help=_ ('show version number and exit'))
 952     p.add_option ('-w', '--warranty', help=_ ('show warranty and copyright'),
 953            action='store_true',
 954            ),
 955     p.add_option ('-x', '--text-lyrics', help=_ ('treat every text as a lyric'),
 956            action='store_true')
 957
 958     p.add_option_group (ly.display_encode (_ ('Examples')),
 959               description = r'''
 960   $ midi2ly --key=-2:1 --duration-quant=32 --allow-tuplet=4*2/3 --allow-tuplet=2*4/3 foo.midi
 961 ''')
 962     p.add_option_group ('',
 963                         description=(
 964             _ ('Report bugs via %s')
 965             % 'http://post.gmane.org/post.php'
 966             '?group=gmane.comp.gnu.lilypond.bugs') + '\n')
 967     return p
 968
 969
 970
 971 def do_options ():
 972     opt_parser = get_option_parser ()
 973     (options, args) = opt_parser.parse_args ()
 974
 975     if not args or args[0] == '-':
 976         opt_parser.print_help ()
 977         ly.stderr_write ('\n%s: %s %s\n' % (program_name, _ ('error: '),
 978                          _ ('no files specified on command line.')))
 979         sys.exit (2)
 980
 981     if options.duration_quant:
 982         options.duration_quant = int (options.duration_quant)
 983
 984     if options.warranty:
 985         warranty ()
 986         sys.exit (0)
 987     if 1:
 988         (alterations, minor) = map (int, (options.key + ':0').split (':'))[0:2]
 989         sharps = 0
 990         flats = 0
 991         if alterations >= 0:
 992             sharps = alterations
 993         else:
 994             flats = - alterations
 995
 996         options.key = Key (sharps, flats, minor)
 997
 998     if options.start_quant:
 999         options.start_quant = int (options.start_quant)
1000
1001     global bar_max
1002     if options.preview:
1003         bar_max = 4
1004
1005     options.allowed_tuplets = [map (int, a.replace ('/','*').split ('*'))
1006                 for a in options.allowed_tuplets]
1007
1008     if options.verbose:
1009         sys.stderr.write ('Allowed tuplets: %s\n' % `options.allowed_tuplets`)
1010
1011     global global_options
1012     global_options = options
1013
1014     return args
1015
1016 def main ():
1017     files = do_options ()
1018
1019     for f in files:
1020         g = f
1021         g = strip_extension (g, '.midi')
1022         g = strip_extension (g, '.mid')
1023         g = strip_extension (g, '.MID')
1024         (outdir, outbase) = ('','')
1025
1026         if not global_options.output:
1027             outdir = '.'
1028             outbase = os.path.basename (g)
1029             o = os.path.join (outdir, outbase + '-midi.ly')
1030         elif global_options.output[-1] == os.sep:
1031             outdir = global_options.output
1032             outbase = os.path.basename (g)
1033             os.path.join (outdir, outbase + '-gen.ly')
1034         else:
1035             o = global_options.output
1036             (outdir, outbase) = os.path.split (o)
1037
1038         if outdir != '.' and outdir != '':
1039             try:
1040                 os.mkdir (outdir, 0777)
1041             except OSError:
1042                 pass
1043
1044         convert_midi (f, o)
1045
1046 if __name__ == '__main__':
1047     main ()