synthio: add a host demo of all major features

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Jeff Epler 2023-05-12 13:57:33 -05:00
parent f68ab9c5c2
commit 91a5103910
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@ -0,0 +1,282 @@
import random
import audiocore
import synthio
from ulab import numpy as np
import adafruit_wave as wave
h = np.array(
[
-0.001229734800309099,
-0.008235561806605458,
-0.015082497016061390,
-0.020940136918319988,
-0.024981800822463429,
-0.026464233332370746,
-0.024803890156806906,
-0.019642276775473012,
-0.010893620860173042,
0.001230341899766145,
0.016221637398855598,
0.033304135659230648,
0.051486665261155681,
0.069636961761409016,
0.086570197432542767,
0.101144354207918147,
0.112353938422488253,
0.119413577288191297,
0.121823886314051028,
0.119413577288191297,
0.112353938422488253,
0.101144354207918147,
0.086570197432542767,
0.069636961761409016,
0.051486665261155681,
0.033304135659230648,
0.016221637398855598,
0.001230341899766145,
-0.010893620860173042,
-0.019642276775473012,
-0.024803890156806906,
-0.026464233332370746,
-0.024981800822463429,
-0.020940136918319988,
-0.015082497016061390,
-0.008235561806605458,
-0.001229734800309099,
]
)
filter_coeffs = np.array(h[::-1] * 32768, dtype=np.int16)
def randf(lo, hi):
return random.random() * (hi - lo) + lo
SAMPLE_SIZE = 1024
VOLUME = 14700
sine = np.array(
np.sin(np.linspace(0, 2 * np.pi, SAMPLE_SIZE, endpoint=False)) * VOLUME, dtype=np.int16
)
square = np.array([24000] * (SAMPLE_SIZE // 2) + [-24000] * (SAMPLE_SIZE // 2), dtype=np.int16)
noise = np.array(
[random.randint(-32768, 32767) for i in range(SAMPLE_SIZE)],
dtype=np.int16,
)
envelope = synthio.Envelope(
attack_time=0.1, decay_time=0.05, release_time=0.2, attack_level=1, sustain_level=0.8
)
instant = synthio.Envelope(
attack_time=0, decay_time=0, release_time=0, attack_level=1, sustain_level=1
)
synth = synthio.Synthesizer(
sample_rate=48000, envelope=None, filter=filter_coeffs, channel_count=2
)
def synthesize(synth):
print(
"""you can use arbitrary waveforms, including ones calculated on the fly or read from wave files (up to 1024 points)"""
)
waveform = np.zeros(SAMPLE_SIZE, dtype=np.int16)
chord = [
synthio.Note(synthio.midi_to_hz(n), waveform=waveform, envelope=envelope)
for n in (60, 64, 67, 70)
]
synth.press(chord)
for i in range(256):
ctrl = i / 255
waveform[:] = np.array(square * (1 - ctrl) + sine * ctrl, dtype=np.int16)
yield 4
def synthesize2(synth):
print("""Envelope controls how notes fade in or out""")
chord = [
synthio.Note(synthio.midi_to_hz(n), waveform=sine, envelope=instant)
for n in (60, 64, 67, 70)
]
for i in range(4):
for c in chord:
synth.release_all_then_press((c,))
yield 24
synth.release_all()
chord = [
synthio.Note(synthio.midi_to_hz(n), waveform=sine, envelope=envelope)
for n in (60, 64, 67, 70)
]
for i in range(4):
for c in chord:
old = (c,)
synth.release_all_then_press((c,))
yield 24
def synthesize3(synth):
print("""A noise waveform creates percussive sounds""")
env = synthio.Envelope(
attack_time=0,
decay_time=0.2,
sustain_level=0,
)
notes = [
synthio.Note(
frequency=synthio.midi_to_hz(1 + i),
waveform=noise,
envelope=env,
)
for i in range(12)
]
random.seed(9)
for _ in range(16):
n = random.choice(notes)
d = random.randint(30, 60)
synth.press((n,))
yield d
def synthesize4(synth):
print("""Tremolo varies the note volume within a range at a low frequency""")
chord = [
synthio.Note(synthio.midi_to_hz(n), waveform=sine, envelope=None) for n in (60, 64, 67, 70)
]
synth.press(chord)
for i in range(16):
for c in chord:
c.tremolo_depth = i / 50
c.tremolo_rate = (i + 1) / 4
yield 48
yield 36
def synthesize5(synth):
print("""You can add vibrato or frequency sweep to notes""")
chord = [synthio.Note(synthio.midi_to_hz(n), waveform=sine) for n in (60, 64, 67, 70)]
synth.press(chord)
for i in range(16):
for c in chord:
c.bend_depth = 1 / 24
c.bend_rate = (i + 1) / 2
yield 24
synth.release_all()
yield 100
for c in chord:
synth.release_all()
c.bend_mode = synthio.BendMode.SWEEP_IN
c.bend_depth = randf(-1, 1)
c.bend_rate = 1 / 2
synth.press(chord)
yield 320
def synthesize6(synth):
print("""Ring modulation multiplies two waveforms together to create rich sounds""")
chord = [
synthio.Note(synthio.midi_to_hz(n), waveform=square, ring_waveform=sine, envelope=envelope)
for n in (60,)
]
synth.press(chord)
yield 200
random.seed(75)
for _ in range(3):
synth.release_all()
yield 36
for note in chord:
note.ring_frequency = note.frequency * (random.random() * 35 / 1200 + 8)
synth.press(chord)
yield 200
def synthesize7(synth):
print("""FIR filtering can reproduce low, high, notch and band filters""")
chord = [
synthio.Note(synthio.midi_to_hz(n), waveform=square, filter=False)
for n in (60, 64, 67, 70)
]
for i in range(4):
for c in chord:
synth.release_all_then_press((c,))
yield 24
synth.release_all()
for note in chord:
note.filter = True
for i in range(4):
for c in chord:
synth.release_all_then_press((c,))
yield 24
def synthesize8(synth):
print("""Notes can be panned between channels""")
chord = [
synthio.Note(synthio.midi_to_hz(n), waveform=square, envelope=envelope)
for n in (60, 64, 67, 70)
]
synth.press(chord)
for p in range(-10, 11, 1):
for note in chord:
note.panning = p / 10
yield 36
def delay(synth):
synth.release_all()
yield 200
def chain(*args):
for a in args:
yield from a
# sox -r 48000 -e signed -b 16 -c 1 tune.raw tune.wav
with wave.open("demo.wav", "w") as f:
f.setnchannels(2)
f.setsampwidth(2)
f.setframerate(48000)
import array
for n in chain(
synthesize(synth),
delay(synth),
synthesize2(synth),
delay(synth),
synthesize3(synth),
delay(synth),
synthesize4(synth),
delay(synth),
synthesize5(synth),
delay(synth),
synthesize6(synth),
delay(synth),
synthesize7(synth),
delay(synth),
synthesize8(synth),
):
for i in range(n):
result, data = audiocore.get_buffer(synth)
f.writeframes(data)