def test_sine_tone():
"""The wavetable is repeated through the tone."""
# Calculate the envelope so we can divide it out of the generated sample
envelope = tone(wavetable=Wavetable.from_function(lambda t: 1))
pitch = 50.0
sound = tone(pitch=pitch)
samples = []
expected = []
for i in range(1000, 44100, 1000):
t = i / 44100.0
phase = (t * pitch) % 1.0 * tau
sample = sound[i]
env = envelope[i]
samples.append(sample / env)
expected.append(sin(phase))
assert samples == approx(expected, abs=0.05)
def on_click(self, pos):
super().on_click(pos)
print("tone = pyfxr.tone(",
f" {self.note!r}",
" attack=0.05,",
" sustain=0.0,",
" release=0.1,",
" wavetable=wavetable,",
")",
sep="\n")
s = pygame.mixer.Sound(buffer=pyfxr.tone(self.note,
attack=0.05,
sustain=0.0,
release=0.1,
wavetable=Waveform.current))
s.set_volume(0.5)
s.play()
def test_adsr_envelope():
"""Tones are modulated by an ADSR envelope."""
w = Wavetable.from_function(lambda t: 1)
sound = tone(attack=0.1,
decay=0.1,
sustain=0.75,
release=0.25,
wavetable=w)
def sample_at(t: float) -> float:
"""Get the (float) value of the waveform at time t."""
return sound[min(int(t * 44100), len(sound) - 1)] / (1 << 15)
samples = list(map(
sample_at,
[0, 0.05, 0.1, 0.2, 0.5, 0.95, 1.2],
))
assert samples == approx([0, 0.5, 1.0, 0.7, 0.7, 0.7, 0], abs=1e-3)
def _create(params):
"""Actually create a tone."""
# Construct a mono tone of the right length
tone = pyfxr.tone(
pitch=params.hz,
sustain=max(0, params.duration - 0.2),
wavetable=params.waveform.value,
)
# NB. pygame assumes that the sound format of any buffer object matches
# that of the current mixer settings. We use mixer.pre_init(22050, -16, 2)
# which means that it is expecting 22kHz audio stereo, but we're feeding it
# 44kHz mono - but, perhaps surprisingly, that works Ok. The extra samples
# get interpreted as the second channel.
#
# If we change the mixer to 44kHz we'd need to convert to stereo here by
# doubling samples.
#
# Really this is a mess and Pygame should support converting the format
# of buffers (as it does for .wav files).
snd = pygame.mixer.Sound(buffer=tone)
snd.set_volume(params.volume)
return snd
from math import sin
import pyglet.media
import pyfxr
window = pyglet.window.Window()
wt = pyfxr.Wavetable.from_function(
lambda t: 0.75 * sin(t) + 0.25 * sin(3 * t + 0.5))
tone = pyfxr.tone(pitch='A4')
#tone = pyfxr.pluck(duration=1.0, pitch='A4')
source = pyglet.media.StaticSource(tone)
@window.event
def on_mouse_press(x, y, button, modifiers):
source.play()
pyglet.app.run()