src/songs/MidiToSong.py

   1 '''
   2 Created on 8 dec. 2009
   3
   4 @author: Samuel Benveniste
   5 '''
   6
   7 from mxmMidi.MidiOutStream import MidiOutStream
   8
   9 class MidiToSong(MidiOutStream):
  10     '''
  11     Creates songs from midi files using mxmMidi package
  12     '''
  13     def __init__(self):
  14         self.midiNoteNumbers = []
  15         self.noteLengths = []
  16         self.quarterNoteLength = 500
  17         self.firstNoteOn = True
  18         self._lastNoteOnTime = 0
  19
  20     def header(self, format=0, nTracks=1, division=96):
  21         print 'format: %s, nTracks: %s, division: %s' % (format, nTracks, division)
  22         print '----------------------------------'
  23         print ''
  24         self.division = division
  25
  26     def tempo(self,value):
  27         self.quarterNoteLength = value/1000
  28         print "quarterNoteLength in ms :" + str(self.quarterNoteLength)
  29
  30     def note_on(self, channel=0, note=0x40, velocity=0x40):
  31         self.midiNoteNumbers.append(note)
  32         # if it's the first note_on take note of time (the song begins here)
  33         # from the second note_on and after, mark the length of the preceding note
  34         if self.firstNoteOn :
  35             self.firstNoteOn = False
  36             self._lastNoteOnTime = self.abs_time()
  37         else :
  38             self.noteLengths.append(float(self.abs_time()-self._lastNoteOnTime)/float(self.division))
  39             self._lastNoteOnTime = self.abs_time()
  40
  41     def eof(self):
  42         self.noteLengths.append(4)
  43         for i in range(len(self.midiNoteNumbers)):
  44             print "note number :" + str(self.midiNoteNumbers[i]) + ", length in quarter Notes :" + str(self.noteLengths[i])
  45         print"--------------"
  46         print "end of file"
  47
  48 if __name__ == '__main__':
  49
  50     # get data
  51     test_file = '../songs/midis/test.mid'
  52     f = open(test_file, 'rb')
  53
  54     # do parsing
  55     from mxmMidi.MidiInFile import MidiInFile
  56     mts = MidiToSong()
  57     midiIn = MidiInFile(mts, f)
  58     midiIn.read()
  59     f.close()
  60