Created
December 26, 2019 03:52
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#!/usr/bin/env python | |
# | |
# Listen to justly-tuned progressions. | |
# | |
# python3.8 ji.py 1+5:4+7:4 1+4:3+5:3 1+5:4+6:4 1+5:4+7:5 3:4+9:8+4:3 1:2+3:4+5:4 | aplay -r44 -f S16_LE | |
# python3.8 ji.py 1+5:4+3:2 15:16+9:8+3:2 1+5:4+3:2 | ffmpeg -f s16le -ar 44.1k -ac 1 -i - out.mp3 | |
# | |
import struct | |
import sys | |
from math import * | |
def parse_ratio(string): | |
if ':' in string: | |
a, b = string.split(':') | |
return float(a) / float(b) | |
return float(string) | |
sample_rate = 44100.0 | |
def sample(amplitude: float) -> int: | |
return int(max(-1, min(1, amplitude)) * 32767) | |
def organ(t: float) -> float: | |
t *= 2*pi | |
return sin(t) * 0.1 + sin(2*t) * 0.01 + sin(3*t) * 0.001 | |
def emit(seconds: float, func) -> bytes: | |
samples = int(sample_rate * seconds) | |
soft_func = lambda t: func(t) * min(1, 50*t, 50*(1-t)) # avoid clicky audio | |
return struct.pack(f'<{samples}h', *(sample(soft_func(i / sample_rate)) for i in range(samples))) | |
if __name__ == '__main__': | |
if len(sys.argv) <= 1: | |
sys.exit(f'usage: {sys.argv[0]} 1+5:4+3:2 15:16+9:8+3:2 1+5:4+3:2') | |
base = 220 | |
if sys.argv[1] == '-b': | |
base = float(sys.argv[2]) | |
del sys.argv[1:3] | |
for chord in sys.argv[1:]: | |
sound = lambda t: sum(organ(base*parse_ratio(note)*t) for note in chord.split('+')) | |
sys.stdout.buffer.write(emit(1.0, sound)) |
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