1.04 Start and Basics
=====================
Pyknon offers to easily generate midi files, rather to modify the
MIDI-file directly and manually with noteOn and noteOff commands.
.. code:: python3
from pyknon.genmidi import Midi
from pyknon.music import Rest, Note, NoteSeq
import numpy as np
Pyknon
------
There exist two different notations one with the **Note()** function and
a simplified **plain text** version
Note(value , octave , dur , volume)
- value: integer, note hight in semitones, 0 = middle C = midi 60
- octave: octave number
- dur: duration, 0.25 = quarter note
- volume: from 1 to 127
.. code:: python3
def tune_A():
notes1 = NoteSeq( "C4 D E F G A B C''") # Apostroph ' = "gestrichen" = Höhe der Oktave
notes2 = NoteSeq("r1 r1 C4'' B' A G F E D C") # r = rest = Pause; Zahl = Länge der Pause
return notes1, notes2
def tune_B():
notes1 = NoteSeq("Db4- F#8 A Bb4") # Zahl = Länge des Tones: 1=ganz, 4=Viertel
notes2 = NoteSeq([Note(2, dur=1/4), Note(6, dur=1/8), Note(9, dur=1/8), Note(10, dur=1/4)])
return notes1, notes2
def tune_C():
major = [0,2,4,5,7,9,11]
minor = [0,2,3,5,7,8,10]
track1 = major + [12]
track2 = minor[::-1] # reverse
notes1 = NoteSeq( [Note(no) for no in track1] )
notes2 = NoteSeq( [Rest(2)] + [Note(no) for no in track2] )
return notes1, notes2
def generate_midi():
#--- choose the tune
notes1, notes2 = tune_C()
#--- squezze into a MIDI framework
m = Midi(2, tempo=120) #
m.seq_notes(notes1, track=0)
m.seq_notes(notes2, track=1)
#--- write the MIDI file
midi_file_name = "tune_C.mid" # set the name of the file
m.write(midi_file_name)
return midi_file_name
generate_midi()
.. parsed-literal::
'tune_C.mid'
MIDI: Play and Generate audio-file
----------------------------------
External players offered a better sound quality in comparison with
python libraries. We use **VLC** and **Musescore**.
.. code:: python3
import subprocess
default_soundfont = '/usr/share/sounds/sf3/MuseScore_General.sf3'
def midi_play(midi_in, soundfont= default_soundfont):
subprocess.call(['cvlc', midi_in , 'vlc://quit']) # cvlc = vlc without gui
def midi_audio(midi_in, name_out = 'none', soundfont= default_soundfont):
if name_out == 'none' :
name_out = midi_in.replace('.mid', '.flac')
else:
name_out = name_out + '.flac'
subprocess.call(['mscore', '-o', name_out, midi_in]) # -o = export as
def midi_png(midi_in, name_out = 'none'):
if name_out == 'none' :
name_out = midi_in.replace('.mid', '.png')
else:
name_out = name_out + '.png'
subprocess.call(['mscore', '-o', name_out, '-T', '2', midi_in]) # -o = export as , -T 0 = cut page with 0 pixel
midi_play('tune_C.mid')
midi_audio('tune_C.mid')
midi_png('tune_C.mid')
.. raw:: html
tune_A
tune_B
tune_C
tune_C
