scripts/lilymidi.py

   1 #!@TARGET_PYTHON@
   2
   3 # Copyright (c) 2006--2009 Brailcom, o.p.s.
   4 #
   5 # Author: Milan Zamazal <pdm@brailcom.org>
   6 #
   7 # COPYRIGHT NOTICE
   8 #
   9 # This program is free software; you can redistribute it and/or modify
  10 # it under the terms of the GNU General Public License as published by
  11 # the Free Software Foundation; either version 2 of the License, or
  12 # (at your option) any later version.
  13 #
  14 # This program is distributed in the hope that it will be useful, but
  15 # WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  16 # or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  17 # for more details.
  18 #
  19 # You should have received a copy of the GNU General Public License
  20 # along with this program; if not, write to the Free Software
  21 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
  22
  23
  24 import optparse
  25 import os
  26 import sys
  27
  28 """
  29 @relocate-preamble@
  30 """
  31
  32 def process_options (args):
  33     parser = optparse.OptionParser (version="@TOPLEVEL_VERSION@")
  34     parser.add_option ('', '--filter-tracks', metavar='REGEXP', action='store', type='string', dest='regexp',
  35                        help="display only tracks numbers, of those track names matching REGEXP")
  36     parser.add_option ('', '--prefix-tracks', metavar='PREFIX', action='store', type='string', dest='prefix',
  37                        help="prefix filtered track numbers with PREFIX")
  38     parser.add_option ('', '--dump', action='store_true', dest='dump',
  39                        help="just dump parsed contents of the MIDI file")
  40     parser.usage = parser.usage + " FILE"
  41     options, args = parser.parse_args (args)
  42     if len (args) != 1:
  43         parser.print_help ()
  44         sys.exit (2)
  45     return options, args
  46
  47 def read_midi (file):
  48     import midi
  49     return midi.parse (open (file).read ())
  50
  51 def track_info (data):
  52     tracks = data[1]
  53     def track_name (track):
  54         name = ''
  55         for time, event in track:
  56             if time > 0:
  57                 break
  58             if event[0] == 255 and event[1] == 3:
  59                 name = event[2]
  60                 break
  61         return name
  62     track_info = []
  63     for i in range (len (tracks)):
  64         track_info.append ((i, track_name (tracks[i])))
  65     return track_info
  66
  67 def go ():
  68     options, args = process_options (sys.argv[1:])
  69     midi_file = args[0]
  70     midi_data = read_midi (midi_file)
  71     info = track_info (midi_data)
  72     if options.dump:
  73         print midi_data
  74     elif options.regexp:
  75         import re
  76         regexp = re.compile (options.regexp)
  77         numbers = [str(n+1) for n, name in info if regexp.search (name)]
  78         if numbers:
  79             if options.prefix:
  80                 sys.stdout.write ('%s ' % (options.prefix,))
  81             import string
  82             sys.stdout.write (string.join (numbers, ','))
  83             sys.stdout.write ('\n')
  84     else:
  85         for n, name in info:
  86             sys.stdout.write ('%d %s\n' % (n+1, name,))
  87
  88 if __name__ == '__main__':
  89     go ()