synthio: add a noise program to the manual tests

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Jeff Epler 2023-05-10 09:27:47 -05:00
parent 1d1907b98b
commit 2062b2bfb7
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1 changed files with 71 additions and 0 deletions

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import sys
sys.path.insert(
0, f"{__file__.rpartition('/')[0] or '.'}/../../../../frozen/Adafruit_CircuitPython_Wave"
)
import random
import audiocore
import synthio
from ulab import numpy as np
import adafruit_wave as wave
random.seed(9)
SAMPLE_SIZE = 1024
VOLUME = 14700
noise = np.array(
[random.randint(-32768, 32767) for i in range(SAMPLE_SIZE)],
dtype=np.int16,
)
envelope = synthio.Envelope(
attack_time=0,
decay_time=0.2,
sustain_level=0,
)
synth = synthio.Synthesizer(sample_rate=48000)
def randf(lo, hi):
return random.random() * (hi - lo) + lo
def synthesize(synth):
notes = [
synthio.Note(
frequency=synthio.midi_to_hz(1 + i),
waveform=noise,
envelope=envelope,
bend_mode=synthio.BendType.SWEEP,
bend_depth=random.choice((-1, 1)),
bend_rate=randf(4, 12),
)
for i in range(12)
]
random.seed(9)
for _ in range(16):
n = random.choice(notes)
d = random.randint(30, 60)
print(n, d)
synth.press((n,))
yield d
synth.release_all()
yield 36
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("noise.wav", "w") as f:
f.setnchannels(1)
f.setsampwidth(2)
f.setframerate(48000)
for n in chain(synthesize(synth)):
for i in range(n):
result, data = audiocore.get_buffer(synth)
f.writeframes(data)