neingeist
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arduinisten
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Python

15 years ago
from MidiOutFile import MidiOutFile
from MidiInFile import MidiInFile
"""
This is an example of the smallest possible type 0 midi file, where
all the midi events are in the same track.
"""
class Transposer(MidiOutFile):
"Transposes all notes by 1 octave"
def _transp(self, ch, note):
if ch != 9: # not the drums!
note += 12
if note > 127:
note = 127
return note
def note_on(self, channel=0, note=0x40, velocity=0x40):
note = self._transp(channel, note)
MidiOutFile.note_on(self, channel, note, velocity)
def note_off(self, channel=0, note=0x40, velocity=0x40):
note = self._transp(channel, note)
MidiOutFile.note_off(self, channel, note, velocity)
out_file = 'midiout/transposed.mid'
midi_out = Transposer(out_file)
#in_file = 'midiout/minimal_type0.mid'
#in_file = 'test/midifiles/Lola.mid'
in_file = 'test/midifiles/tennessee_waltz.mid'
midi_in = MidiInFile(midi_out, in_file)
midi_in.read()