scripts/midi2ly.py

   1 #!@TARGET_PYTHON@
   2 #
   3 # midi2ly.py -- LilyPond midi import script
   4 #
   5 # source file of the GNU LilyPond music typesetter
   6 #
   7 # (c) 1998--2007  Han-Wen Nienhuys <hanwen@xs4all.nl>
   8 #                 Jan Nieuwenhuizen <janneke@gnu.org>
   9
  10
  11 '''
  12 TODO:
  13     * test on weird and unquantised midi input (lily-devel)
  14     * update doc and manpage
  15
  16     * simply insert clef changes whenever too many ledger lines
  17         [to avoid tex capacity exceeded]
  18     * do not ever quant skips
  19     * better lyrics handling
  20     * [see if it is feasible to] move ly-classes to library for use in
  21         other converters, while leaving midi specific stuff here
  22 '''
  23
  24 import os
  25 import sys
  26
  27 """
  28 @relocate-preamble@
  29 """
  30
  31 import midi
  32 import lilylib as ly
  33 global _;_=ly._
  34
  35 ################################################################
  36 ## CONSTANTS
  37
  38
  39 output_name = ''
  40 LINE_BELL = 60
  41 scale_steps = [0, 2, 4, 5, 7, 9, 11]
  42 global_options = None
  43
  44 clocks_per_1 = 1536
  45 clocks_per_4 = 0
  46
  47 time = 0
  48 reference_note = 0
  49 start_quant_clocks = 0
  50
  51 duration_quant_clocks = 0
  52 allowed_tuplet_clocks = []
  53
  54
  55 ################################################################
  56
  57
  58 program_name = sys.argv[0]
  59 program_version = '@TOPLEVEL_VERSION@'
  60
  61 errorport = sys.stderr
  62
  63 def identify ():
  64     sys.stdout.write ('%s (GNU LilyPond) %s\n' % (program_name, program_version))
  65
  66 def warranty ():
  67     identify ()
  68     ly.encoded_write (sys.stdout, '''
  69 Copyright (c) %s by
  70
  71  Han-Wen Nienhuys
  72  Jan Nieuwenhuizen
  73
  74 %s
  75 %s
  76 '''  ( '2001--2006',
  77    _('Distributed under terms of the GNU General Public License.'),
  78    _('It comes with NO WARRANTY.')))
  79
  80
  81 def progress (s):
  82     ly.encoded_write (errorport, s + '\n')
  83
  84 def warning (s):
  85     progress (_ ("warning: ") + s)
  86
  87 def error (s):
  88     progress (_ ("error: ") + s)
  89     raise Exception (_ ("Exiting... "))
  90
  91 def system (cmd, ignore_error = 0):
  92     return ly.system (cmd, ignore_error=ignore_error)
  93
  94 def strip_extension (f, ext):
  95     (p, e) = os.path.splitext (f)
  96     if e == ext:
  97         e = ''
  98     return p + e
  99
 100
 101 class Duration:
 102     allowed_durs = (1, 2, 4, 8, 16, 32, 64, 128)
 103     def __init__ (self, clocks):
 104         self.clocks = clocks
 105         if clocks <= 0:
 106             self.clocks = duration_quant_clocks
 107         (self.dur, self.num, self.den) = self.dur_num_den (clocks)
 108
 109     def dur_num_den (self, clocks):
 110         for i in range (len (allowed_tuplet_clocks)):
 111             if clocks == allowed_tuplet_clocks[i]:
 112                 return global_options.allowed_tuplets[i]
 113
 114         dur = 0; num = 1; den = 1;
 115         g = gcd (clocks, clocks_per_1)
 116         if g:
 117             (dur, num) = (clocks_per_1 / g, clocks / g)
 118         if not dur in self.allowed_durs:
 119             dur = 4; num = clocks; den = clocks_per_4
 120         return (dur, num, den)
 121
 122     def dump (self):
 123         if self.den == 1:
 124             if self.num == 1:
 125                 s = '%d' % self.dur
 126             elif self.num == 3 and self.dur != 1:
 127                 s = '%d.' % (self.dur / 2)
 128             else:
 129                 s = '%d*%d' % (self.dur, self.num)
 130         else:
 131             s = '%d*%d/%d' % (self.dur, self.num, self.den)
 132
 133         global reference_note
 134         reference_note.duration = self
 135
 136         return s
 137
 138     def compare (self, other):
 139         return self.clocks - other.clocks
 140
 141 def sign (x):
 142     if x >= 0:
 143         return 1
 144     else:
 145         return -1
 146
 147 class Note:
 148     names = (0, 0, 1, 1, 2, 3, 3, 4, 4, 5, 5, 6)
 149     alterations = (0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0)
 150     alteration_names = ('eses', 'es', '', 'is' , 'isis')
 151     def __init__ (self, clocks, pitch, velocity):
 152         self.pitch = pitch
 153         self.velocity = velocity
 154         # hmm
 155         self.clocks = clocks
 156         self.duration = Duration (clocks)
 157         (self.octave, self.notename, self.alteration) = self.o_n_a ()
 158
 159     def o_n_a (self):
 160         # major scale: do-do
 161         # minor scale: la-la  (= + 5) '''
 162
 163         n = self.names[(self.pitch) % 12]
 164         a = self.alterations[(self.pitch) % 12]
 165
 166         if a and global_options.key.flats:
 167             a = - self.alterations[(self.pitch) % 12]
 168             n = (n - a) % 7
 169
 170         #  By tradition, all scales now consist of a sequence
 171         #  of 7 notes each with a distinct name, from amongst
 172         #  a b c d e f g.  But, minor scales have a wide
 173         #  second interval at the top - the 'leading note' is
 174         #  sharped. (Why? it just works that way! Anything
 175         #  else doesn't sound as good and isn't as flexible at
 176         #  saying things. In medieval times, scales only had 6
 177         #  notes to avoid this problem - the hexachords.)
 178
 179         #  So, the d minor scale is d e f g a b-flat c-sharp d
 180         #  - using d-flat for the leading note would skip the
 181         #  name c and duplicate the name d.  Why isn't c-sharp
 182         #  put in the key signature? Tradition. (It's also
 183         #  supposedly based on the Pythagorean theory of the
 184         #  cycle of fifths, but that really only applies to
 185         #  major scales...)  Anyway, g minor is g a b-flat c d
 186         #  e-flat f-sharp g, and all the other flat minor keys
 187         #  end up with a natural leading note. And there you
 188         #  have it.
 189
 190         #  John Sankey <bf250@freenet.carleton.ca>
 191         #
 192         #  Let's also do a-minor: a b c d e f gis a
 193         #
 194         #  --jcn
 195
 196         o = self.pitch / 12 - 4
 197
 198         key = global_options.key
 199         if key.minor:
 200             # as -> gis
 201             if (key.sharps == 0 and key.flats == 0
 202                 and n == 5 and a == -1):
 203                 n = 4; a = 1
 204             # des -> cis
 205             elif key.flats == 1 and n == 1 and a == -1:
 206                 n = 0; a = 1
 207             # ges -> fis
 208             elif key.flats == 2 and n == 4 and a == -1:
 209                 n = 3; a = 1
 210             # g -> fisis
 211             elif key.sharps == 5 and n == 4 and a == 0:
 212                 n = 3; a = 2
 213             # d -> cisis
 214             elif key.sharps == 6 and n == 1 and a == 0:
 215                 n = 0; a = 2
 216             # a -> gisis
 217             elif key.sharps == 7 and n == 5 and a == 0:
 218                 n = 4; a = 2
 219
 220         # b -> ces
 221         if key.flats >= 6 and n == 6 and a == 0:
 222             n = 0; a = -1; o = o + 1
 223         # e -> fes
 224         if key.flats >= 7 and n == 2 and a == 0:
 225             n = 3; a = -1
 226
 227         # f -> eis
 228         if key.sharps >= 3 and n == 3 and a == 0:
 229             n = 2; a = 1
 230         # c -> bis
 231         if key.sharps >= 4 and n == 0 and a == 0:
 232             n = 6; a = 1; o = o - 1
 233
 234         return (o, n, a)
 235
 236     def __repr__ (self):
 237         s = chr ((self.notename + 2)  % 7 + ord ('a'))
 238         return 'Note(%s %s)' % (s, self.duration.dump())
 239
 240     def dump (self, dump_dur = 1):
 241         global reference_note
 242         s = chr ((self.notename + 2)  % 7 + ord ('a'))
 243         s = s + self.alteration_names[self.alteration + 2]
 244         if global_options.absolute_pitches:
 245             commas = self.octave
 246         else:
 247             delta = self.pitch - reference_note.pitch
 248             commas = sign (delta) * (abs (delta) / 12)
 249             if ((sign (delta) \
 250               * (self.notename - reference_note.notename) + 7) \
 251               % 7 >= 4) \
 252               or ((self.notename == reference_note.notename) \
 253                 and (abs (delta) > 4) and (abs (delta) < 12)):
 254                 commas = commas + sign (delta)
 255
 256         if commas > 0:
 257             s = s + "'" * commas
 258         elif commas < 0:
 259             s = s + "," * -commas
 260
 261         ## FIXME: compile fix --jcn
 262         if dump_dur and (global_options.explicit_durations \
 263          or self.duration.compare (reference_note.duration)):
 264             s = s + self.duration.dump ()
 265
 266         reference_note = self
 267
 268         # TODO: move space
 269         return s + ' '
 270
 271
 272 class Time:
 273     def __init__ (self, num, den):
 274         self.clocks = 0
 275         self.num = num
 276         self.den = den
 277
 278     def bar_clocks (self):
 279         return clocks_per_1 * self.num / self.den
 280
 281     def __repr__ (self):
 282         return 'Time(%d/%d)' % (self.num, self.den)
 283
 284     def dump (self):
 285         global time
 286         time = self
 287         return '\n  ' + '\\time %d/%d ' % (self.num, self.den) + '\n  '
 288
 289 class Tempo:
 290     def __init__ (self, seconds_per_1):
 291         self.clocks = 0
 292         self.seconds_per_1 = seconds_per_1
 293
 294     def __repr__ (self):
 295         return 'Tempo(%d)' % self.bpm ()
 296
 297     def bpm (self):
 298         return 4 * 60 / self.seconds_per_1
 299
 300     def dump (self):
 301         return '\n  ' + '\\tempo 4 = %d ' % (self.bpm()) + '\n  '
 302
 303 class Clef:
 304     clefs = ('"bass_8"', 'bass', 'violin', '"violin^8"')
 305     def __init__ (self, type):
 306         self.type = type
 307
 308     def __repr__ (self):
 309         return 'Clef(%s)' % self.clefs[self.type]
 310
 311     def dump (self):
 312         return '\n  \\clef %s\n  ' % self.clefs[self.type]
 313
 314 class Key:
 315     key_sharps = ('c', 'g', 'd', 'a', 'e', 'b', 'fis')
 316     key_flats = ('BUG', 'f', 'bes', 'es', 'as', 'des', 'ges')
 317
 318     def __init__ (self, sharps, flats, minor):
 319         self.clocks = 0
 320         self.flats = flats
 321         self.sharps = sharps
 322         self.minor = minor
 323
 324     def dump (self):
 325         global_options.key = self
 326
 327         s = ''
 328         if self.sharps and self.flats:
 329             pass
 330         else:
 331             if self.flats:
 332                 k = (ord ('cfbeadg'[self.flats % 7]) - ord ('a') - 2 -2 * self.minor + 7) % 7
 333             else:
 334                 k = (ord ('cgdaebf'[self.sharps % 7]) - ord ('a') - 2 -2 * self.minor + 7) % 7
 335
 336             if not self.minor:
 337                 name = chr ((k + 2) % 7 + ord ('a'))
 338             else:
 339                 name = chr ((k + 2) % 7 + ord ('a'))
 340
 341             # fis cis gis dis ais eis bis
 342             sharps = (2, 4, 6, 1, 3, 5, 7)
 343             # bes es as des ges ces fes
 344             flats = (6, 4, 2, 7, 5, 3, 1)
 345             a = 0
 346             if self.flats:
 347                 if flats[k] <= self.flats:
 348                     a = -1
 349             else:
 350                 if sharps[k] <= self.sharps:
 351                     a = 1
 352
 353             if a:
 354                 name = name + Note.alteration_names[a + 2]
 355
 356             s = '\\key ' + name
 357             if self.minor:
 358                 s = s + ' \\minor'
 359             else:
 360                 s = s + ' \\major'
 361
 362         return '\n\n  ' + s + '\n  '
 363
 364
 365 class Text:
 366     text_types = (
 367         'SEQUENCE_NUMBER',
 368         'TEXT_EVENT',
 369         'COPYRIGHT_NOTICE',
 370         'SEQUENCE_TRACK_NAME',
 371         'INSTRUMENT_NAME',
 372         'LYRIC',
 373         'MARKER',
 374         'CUE_POINT',)
 375
 376     def __init__ (self, type, text):
 377         self.clocks = 0
 378         self.type = type
 379         self.text = text
 380
 381     def dump (self):
 382         # urg, we should be sure that we're in a lyrics staff
 383         if self.type == midi.LYRIC:
 384             s = '"%s"' % self.text
 385             d = Duration (self.clocks)
 386             if global_options.explicit_durations \
 387              or d.compare (reference_note.duration):
 388                 s = s + Duration (self.clocks).dump ()
 389             s = s + ' '
 390         else:
 391             s = '\n  % [' + self.text_types[self.type] + '] ' + self.text + '\n  '
 392         return s
 393
 394     def __repr__ (self):
 395         return 'Text(%d=%s)' % (self.type, self.text)
 396
 397
 398
 399 def split_track (track):
 400     chs = {}
 401     for i in range(16):
 402         chs[i] = []
 403
 404     for e in track:
 405         data = list (e[1])
 406         if data[0] > 0x7f and data[0] < 0xf0:
 407             c = data[0] & 0x0f
 408             e = (e[0], tuple ([data[0] & 0xf0] + data[1:]))
 409             chs[c].append (e)
 410         else:
 411             chs[0].append (e)
 412
 413     for i in range (16):
 414         if chs[i] == []:
 415             del chs[i]
 416
 417     threads = []
 418     for v in chs.values ():
 419         events = events_on_channel (v)
 420         thread = unthread_notes (events)
 421         if len (thread):
 422             threads.append (thread)
 423     return threads
 424
 425
 426 def quantise_clocks (clocks, quant):
 427     q = int (clocks / quant) * quant
 428     if q != clocks:
 429         for tquant in allowed_tuplet_clocks:
 430             if int (clocks / tquant) * tquant == clocks:
 431                 return clocks
 432         if 2 * (clocks - q) > quant:
 433             q = q + quant
 434     return q
 435
 436 def end_note (pitches, notes, t, e):
 437     try:
 438         (lt, vel) = pitches[e]
 439         del pitches[e]
 440
 441         i = len (notes) - 1
 442         while i > 0:
 443             if notes[i][0] > lt:
 444                 i = i -1
 445             else:
 446                 break
 447         d = t - lt
 448         if duration_quant_clocks:
 449             d = quantise_clocks (d, duration_quant_clocks)
 450             if not d:
 451                 d = duration_quant_clocks
 452
 453         notes.insert (i + 1,
 454               (lt, Note (d, e, vel)))
 455
 456     except KeyError:
 457         pass
 458
 459 def events_on_channel (channel):
 460     pitches = {}
 461
 462     notes = []
 463     events = []
 464     last_lyric = 0
 465     last_time = 0
 466     for e in channel:
 467         t = e[0]
 468
 469         if start_quant_clocks:
 470             t = quantise_clocks (t, start_quant_clocks)
 471
 472
 473         if e[1][0] == midi.NOTE_OFF \
 474          or (e[1][0] == midi.NOTE_ON and e[1][2] == 0):
 475             end_note (pitches, notes, t, e[1][1])
 476
 477         elif e[1][0] == midi.NOTE_ON:
 478             if not pitches.has_key (e[1][1]):
 479                 pitches[e[1][1]] = (t, e[1][2])
 480
 481         # all include ALL_NOTES_OFF
 482         elif e[1][0] >= midi.ALL_SOUND_OFF \
 483           and e[1][0] <= midi.POLY_MODE_ON:
 484             for i in pitches:
 485                 end_note (pitches, notes, t, i)
 486
 487         elif e[1][0] == midi.META_EVENT:
 488             if e[1][1] == midi.END_OF_TRACK:
 489                 for i in pitches:
 490                     end_note (pitches, notes, t, i)
 491                 break
 492
 493             elif e[1][1] == midi.SET_TEMPO:
 494                 (u0, u1, u2) = map (ord, e[1][2])
 495                 us_per_4 = u2 + 256 * (u1 + 256 * u0)
 496                 seconds_per_1 = us_per_4 * 4 / 1e6
 497                 events.append ((t, Tempo (seconds_per_1)))
 498             elif e[1][1] == midi.TIME_SIGNATURE:
 499                 (num, dur, clocks4, count32) = map (ord, e[1][2])
 500                 den = 2 ** dur
 501                 events.append ((t, Time (num, den)))
 502             elif e[1][1] == midi.KEY_SIGNATURE:
 503                 (alterations, minor) = map (ord, e[1][2])
 504                 sharps = 0
 505                 flats = 0
 506                 if alterations < 127:
 507                     sharps = alterations
 508                 else:
 509                     flats = 256 - alterations
 510
 511                 k = Key (sharps, flats, minor)
 512                 events.append ((t, k))
 513
 514                 # ugh, must set key while parsing
 515                 # because Note init uses key
 516                 # Better do Note.calc () at dump time?
 517                 global_options.key = k
 518
 519             elif e[1][1] == midi.LYRIC \
 520               or (global_options.text_lyrics and e[1][1] == midi.TEXT_EVENT):
 521                 if last_lyric:
 522                     last_lyric.clocks = t - last_time
 523                     events.append ((last_time, last_lyric))
 524                 last_time = t
 525                 last_lyric = Text (midi.LYRIC, e[1][2])
 526
 527             elif e[1][1] >= midi.SEQUENCE_NUMBER \
 528               and e[1][1] <= midi.CUE_POINT:
 529                 events.append ((t, Text (e[1][1], e[1][2])))
 530             else:
 531                 if global_options.verbose:
 532                     sys.stderr.write ("SKIP: %s\n" % `e`)
 533                 pass
 534         else:
 535             if global_options.verbose:
 536                 sys.stderr.write ("SKIP: %s\n" % `e`)
 537             pass
 538
 539     if last_lyric:
 540         # last_lyric.clocks = t - last_time
 541         # hmm
 542         last_lyric.clocks = clocks_per_4
 543         events.append ((last_time, last_lyric))
 544         last_lyric = 0
 545
 546     i = 0
 547     while len (notes):
 548         if i < len (events) and notes[0][0] >= events[i][0]:
 549             i = i + 1
 550         else:
 551             events.insert (i, notes[0])
 552             del notes[0]
 553     return events
 554
 555 def unthread_notes (channel):
 556     threads = []
 557     while channel:
 558         thread = []
 559         end_busy_t = 0
 560         start_busy_t = 0
 561         todo = []
 562         for e in channel:
 563             t = e[0]
 564             if e[1].__class__ == Note \
 565              and ((t == start_busy_t \
 566                 and e[1].clocks + t == end_busy_t) \
 567               or t >= end_busy_t):
 568                 thread.append (e)
 569                 start_busy_t = t
 570                 end_busy_t = t + e[1].clocks
 571             elif e[1].__class__ == Time \
 572               or e[1].__class__ == Key \
 573               or e[1].__class__ == Text \
 574               or e[1].__class__ == Tempo:
 575                 thread.append (e)
 576             else:
 577                 todo.append (e)
 578         threads.append (thread)
 579         channel = todo
 580
 581     return threads
 582
 583 def gcd (a,b):
 584     if b == 0:
 585         return a
 586     c = a
 587     while c:
 588         c = a % b
 589         a = b
 590         b = c
 591     return a
 592
 593 def dump_skip (skip, clocks):
 594     return skip + Duration (clocks).dump () + ' '
 595
 596 def dump (d):
 597     return d.dump ()
 598
 599 def dump_chord (ch):
 600     s = ''
 601     notes = []
 602     for i in ch:
 603         if i.__class__ == Note:
 604             notes.append (i)
 605         else:
 606             s = s + i.dump ()
 607     if len (notes) == 1:
 608         s = s + dump (notes[0])
 609     elif len (notes) > 1:
 610         global reference_note
 611         s = s + '<'
 612         s = s + notes[0].dump (dump_dur = 0)
 613         r = reference_note
 614         for i in notes[1:]:
 615             s = s + i.dump (dump_dur = 0 )
 616         s = s + '>'
 617
 618         s = s + notes[0].duration.dump() + ' '
 619         reference_note = r
 620     return s
 621
 622 def dump_bar_line (last_bar_t, t, bar_count):
 623     s = ''
 624     bar_t = time.bar_clocks ()
 625     if t - last_bar_t >= bar_t:
 626         bar_count = bar_count + (t - last_bar_t) / bar_t
 627
 628         if t - last_bar_t == bar_t:
 629             s = '|\n  %% %d\n  ' % bar_count
 630             last_bar_t = t
 631         else:
 632             # urg, this will barf at meter changes
 633             last_bar_t = last_bar_t + (t - last_bar_t) / bar_t * bar_t
 634
 635     return (s, last_bar_t, bar_count)
 636
 637
 638 def dump_channel (thread, skip):
 639     global reference_note, time
 640
 641     global_options.key = Key (0, 0, 0)
 642     time = Time (4, 4)
 643     # urg LilyPond doesn't start at c4, but
 644     # remembers from previous tracks!
 645     # reference_note = Note (clocks_per_4, 4*12, 0)
 646     reference_note = Note (0, 4*12, 0)
 647     last_e = None
 648     chs = []
 649     ch = []
 650
 651     for e in thread:
 652         if last_e and last_e[0] == e[0]:
 653             ch.append (e[1])
 654         else:
 655             if ch:
 656                 chs.append ((last_e[0], ch))
 657
 658             ch = [e[1]]
 659
 660         last_e = e
 661
 662     if ch:
 663         chs.append ((last_e[0], ch))
 664     t = 0
 665     last_t = 0
 666     last_bar_t = 0
 667     bar_count = 1
 668
 669     lines = ['']
 670     for ch in chs:
 671         t = ch[0]
 672
 673         i = lines[-1].rfind ('\n') + 1
 674         if len (lines[-1][i:]) > LINE_BELL:
 675             lines.append ('')
 676
 677         if t - last_t > 0:
 678             lines[-1] = lines[-1] + dump_skip (skip, t-last_t)
 679         elif t - last_t < 0:
 680             errorport.write ('BUG: time skew')
 681
 682         (s, last_bar_t, bar_count) = dump_bar_line (last_bar_t,
 683                               t, bar_count)
 684         lines[-1] = lines[-1] + s
 685
 686         lines[-1] = lines[-1] + dump_chord (ch[1])
 687
 688         clocks = 0
 689         for i in ch[1]:
 690             if i.clocks > clocks:
 691                 clocks = i.clocks
 692
 693         last_t = t + clocks
 694
 695         (s, last_bar_t, bar_count) = dump_bar_line (last_bar_t,
 696                               last_t, bar_count)
 697         lines[-1] = lines[-1] + s
 698
 699     return '\n  '.join (lines) + '\n'
 700
 701 def track_name (i):
 702     return 'track%c' % (i + ord ('A'))
 703
 704 def channel_name (i):
 705     return 'channel%c' % (i + ord ('A'))
 706
 707 def dump_track (channels, n):
 708     s = '\n'
 709     track = track_name (n)
 710     clef = guess_clef (channels)
 711
 712     for i in range (len (channels)):
 713         channel = channel_name (i)
 714         item = thread_first_item (channels[i])
 715
 716         if item and item.__class__ == Note:
 717             skip = 's'
 718             s = s + '%s = ' % (track + channel)
 719             if not global_options.absolute_pitches:
 720                 s = s + '\\relative c '
 721         elif item and item.__class__ == Text:
 722             skip = '" "'
 723             s = s + '%s = \\lyricmode ' % (track + channel)
 724         else:
 725             skip = '\\skip '
 726             s = s + '%s =  ' % (track + channel)
 727         s = s + '{\n'
 728         s = s + '  ' + dump_channel (channels[i][0], skip)
 729         s = s + '}\n\n'
 730
 731     s = s + '%s = <<\n' % track
 732
 733     if clef.type != 2:
 734         s = s + clef.dump () + '\n'
 735
 736     for i in range (len (channels)):
 737         channel = channel_name (i)
 738         item = thread_first_item (channels[i])
 739         if item and item.__class__ == Text:
 740             s = s + '  \\context Lyrics = %s \\%s\n' % (channel,
 741                                   track + channel)
 742         else:
 743             s = s + '  \\context Voice = %s \\%s\n' % (channel,
 744                                  track + channel)
 745     s = s + '>>\n\n'
 746     return s
 747
 748 def thread_first_item (thread):
 749     for chord in thread:
 750         for event in chord:
 751             if (event[1].__class__ == Note
 752               or (event[1].__class__ == Text
 753                 and event[1].type == midi.LYRIC)):
 754
 755               return event[1]
 756     return None
 757
 758 def track_first_item (track):
 759     for thread in track:
 760         first = thread_first_item (thread)
 761         if first:
 762             return first
 763     return None
 764
 765 def guess_clef (track):
 766     i = 0
 767     p = 0
 768     for thread in track:
 769         for chord in thread:
 770             for event in chord:
 771                 if event[1].__class__ == Note:
 772                     i = i + 1
 773                     p = p + event[1].pitch
 774     if i and p / i <= 3*12:
 775         return Clef (0)
 776     elif i and p / i <= 5*12:
 777         return Clef (1)
 778     elif i and p / i >= 7*12:
 779         return Clef (3)
 780     else:
 781         return Clef (2)
 782
 783
 784 def convert_midi (in_file, out_file):
 785     global clocks_per_1, clocks_per_4, key
 786     global start_quant_clocks
 787     global  duration_quant_clocks
 788     global allowed_tuplet_clocks
 789
 790     str = open (in_file).read ()
 791     midi_dump = midi.parse (str)
 792
 793     clocks_per_1 = midi_dump[0][1]
 794     clocks_per_4 = clocks_per_1 / 4
 795
 796     if global_options.start_quant:
 797         start_quant_clocks = clocks_per_1 / global_options.start_quant
 798
 799     if global_options.duration_quant:
 800         duration_quant_clocks = clocks_per_1 / global_options.duration_quant
 801
 802     allowed_tuplet_clocks = []
 803     for (dur, num, den) in global_options.allowed_tuplets:
 804         allowed_tuplet_clocks.append (clocks_per_1 / den)
 805
 806     tracks = []
 807     for t in midi_dump[1]:
 808         global_options.key = Key (0, 0, 0)
 809         tracks.append (split_track (t))
 810
 811     tag = '%% Lily was here -- automatically converted by %s from %s' % ( program_name, in_file)
 812
 813
 814     s = ''
 815     s = tag + '\n\\version "2.7.18"\n\n'
 816     for i in range (len (tracks)):
 817         s = s + dump_track (tracks[i], i)
 818
 819     s = s + '\n\\score {\n  <<\n'
 820
 821     i = 0
 822     for t in tracks:
 823         track = track_name (i)
 824         item = track_first_item (t)
 825
 826         if item and item.__class__ == Note:
 827             s = s + '    \\context Staff=%s \\%s\n' % (track, track)
 828         elif item and item.__class__ == Text:
 829             s = s + '    \\context Lyrics=%s \\%s\n' % (track, track)
 830
 831         i += 1
 832     s = s + '  >>\n}\n'
 833
 834     progress (_ ("%s output to `%s'...") % ('LY', out_file))
 835
 836     if out_file == '-':
 837         handle = sys.stdout
 838     else:
 839         handle = open (out_file, 'w')
 840
 841     handle.write (s)
 842     handle.close ()
 843
 844
 845 def get_option_parser ():
 846     p = ly.get_option_parser (usage=_ ("%s [OPTION]... FILE") % 'midi2ly',
 847                  description=_ ("Convert %s to LilyPond input.\n") % 'MIDI',
 848                  add_help_option=False)
 849
 850     p.add_option ('-a', '--absolute-pitches',
 851            action='store_true',
 852            help=_ ("print absolute pitches"))
 853     p.add_option ('-d', '--duration-quant',
 854            metavar= _("DUR"),
 855            help=_ ("quantise note durations on DUR"))
 856     p.add_option ('-e', '--explicit-durations',
 857            action='store_true',
 858            help=_ ("print explicit durations"))
 859     p.add_option("-h", "--help",
 860                  action="help",
 861                  help=_ ("show this help and exit"))
 862     p.add_option('-k', '--key', help=_ ("set key: ALT=+sharps|-flats; MINOR=1"),
 863           metavar=_ ("ALT[:MINOR]"),
 864           default='0'),
 865     p.add_option ('-o', '--output', help=_ ("write output to FILE"),
 866            metavar=_("FILE"),
 867            action='store')
 868     p.add_option ('-s', '--start-quant',help= _ ("quantise note starts on DUR"),
 869            metavar=_ ("DUR"))
 870     p.add_option ('-t', '--allow-tuplet',
 871            metavar=_ ("DUR*NUM/DEN"),
 872            action = "append",
 873            dest="allowed_tuplets",
 874            help=_ ("allow tuplet durations DUR*NUM/DEN"),
 875            default=[])
 876     p.add_option ('-V', '--verbose', help=_ ("be verbose"),
 877            action='store_true'
 878            ),
 879     p.version = "midi2ly (LilyPond) @TOPLEVEL_VERSION@"
 880     p.add_option("--version",
 881                  action="version",
 882                  help=_ ("show version number and exit"))
 883     p.add_option ('-w', '--warranty', help=_ ("show warranty and copyright"),
 884            action='store_true',
 885            ),
 886     p.add_option ('-x', '--text-lyrics', help=_ ("treat every text as a lyric"),
 887            action='store_true')
 888
 889     p.add_option_group (ly.display_encode (_ ("Examples")),
 890               description = r'''
 891   $ midi2ly --key=-2:1 --duration-quant=32 --allow-tuplet=4*2/3 --allow-tuplet=2*4/3 foo.midi
 892 ''')
 893     p.add_option_group ('',
 894                         description=(_ ('Report bugs via')
 895                                      + ''' http://post.gmane.org/post.php'''
 896                                      '''?group=gmane.comp.gnu.lilypond.bugs\n'''))
 897     return p
 898
 899
 900
 901 def do_options ():
 902     opt_parser = get_option_parser()
 903     (options, args) = opt_parser.parse_args ()
 904
 905     if not args or args[0] == '-':
 906         opt_parser.print_help ()
 907         ly.stderr_write ('\n%s: %s %s\n' % (program_name, _ ("error: "),
 908                          _ ("no files specified on command line.")))
 909         sys.exit (2)
 910
 911     if options.duration_quant:
 912         options.duration_quant = int (options.duration_quant)
 913
 914     if options.warranty:
 915         warranty ()
 916         sys.exit (0)
 917     if 1:
 918         (alterations, minor) = map (int, (options.key + ':0').split (':'))[0:2]
 919         sharps = 0
 920         flats = 0
 921         if alterations >= 0:
 922             sharps = alterations
 923         else:
 924             flats = - alterations
 925
 926         options.key = Key (sharps, flats, minor)
 927
 928
 929     if options.start_quant:
 930         options.start_quant = int (options.start_quant)
 931
 932     options.allowed_tuplets = [map (int, a.replace ('/','*').split ('*'))
 933                 for a in options.allowed_tuplets]
 934
 935     global global_options
 936     global_options = options
 937
 938     return args
 939
 940 def main():
 941     files = do_options()
 942
 943     for f in files:
 944         g = f
 945         g = strip_extension (g, '.midi')
 946         g = strip_extension (g, '.mid')
 947         g = strip_extension (g, '.MID')
 948         (outdir, outbase) = ('','')
 949
 950         if not output_name:
 951             outdir = '.'
 952             outbase = os.path.basename (g)
 953             o = os.path.join (outdir, outbase + '-midi.ly')
 954         elif output_name[-1] == os.sep:
 955             outdir = output_name
 956             outbase = os.path.basename (g)
 957             os.path.join (outdir, outbase + '-gen.ly')
 958         else:
 959             o = output_name
 960             (outdir, outbase) = os.path.split (o)
 961
 962         if outdir != '.' and outdir != '':
 963             try:
 964                 os.mkdir (outdir, 0777)
 965             except OSError:
 966                 pass
 967
 968         convert_midi (f, o)
 969 if __name__ == '__main__':
 970     main()