Jeff Epler 12c1a72f03
synthio: implement envelope
This works for me (tested playing midi to raw files on host computer, as
well as a variant of the nunchuk instrument on pygamer)

it has to re-factor how/when MIDI reading occurs, because reasons.

endorse new test results

.. and allow `-1` to specify a note with no sustain (plucked)
2023-04-25 12:05:53 -05:00

39 lines
773 B
Python

import struct
import synthio
import audiocore
import ulab.numpy as np
def dump_samples():
print([i for i in audiocore.get_buffer(s)[1][:24]])
s = synthio.Synthesizer(sample_rate=8000)
print(s.pressed)
dump_samples()
s.press((80,))
print(s.pressed)
dump_samples()
s.press((91,))
print(s.pressed)
dump_samples()
s.release_then_press((80,))
print(s.pressed)
dump_samples()
envelope = synthio.Envelope(
attack_time=0.1, decay_time=0.05, release_time=0.2, attack_level=1, sustain_level=0.8
)
s = synthio.Synthesizer(sample_rate=8000, envelope=envelope)
s.press((60,))
for _ in range(12):
buf = audiocore.get_buffer(s)[1]
print((min(buf), max(buf)))
s.release_all()
for _ in range(12):
buf = audiocore.get_buffer(s)[1]
print((min(buf), max(buf)))