kivy/examples/audio/pitch.py

# encoding: utf8

from kivy.app import App
from kivy.core.audio import SoundLoader
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.button import Button

from sys import version_info


NOTES = (
    ('Do', 1),
    ('Ré', 9 / 8.),
    ('Mi', 5 / 4.),
    ('Fa', 4 / 3.),
    ('Sol', 3 / 2.),
    ('La', 5 / 3.),
    ('Si', 15 / 8.),
)


class Test(App):
    def build(self):
        self.sound = SoundLoader.load(
            '/usr/lib64/python{}.{}/test/audiodata/pluck-pcm32.wav'
            .format(*version_info[0:2])
        )
        root = BoxLayout()
        for octave in range(-2, 3):
            for note, pitch in NOTES:
                button = Button(text=note)
                button.pitch = pitch * 2 ** octave
                button.bind(on_release=self.play_note)
                root.add_widget(button)
        return root

    def play_note(self, button):
        self.sound.pitch = button.pitch
        self.sound.play()


Test().run()