"""
Niveau 6
Filtre audio
"""

import synth
import math
import random

music = synth.Midi(32000)

encoder = synth.Encoder()
encoder.sampling = 32000

instruments = [
	lambda t, f: round(math.sin(t * f * 2*math.pi)) + random.random() * 0.3,
	lambda t, f: math.sin(t * f * 2*math.pi),
	lambda t, f: math.sin(t * f * 2*math.pi)*0.6 + math.sin(t * f * 4*math.pi)*0.3 + math.sin(t * f * 8*math.pi)*0.1,
	lambda t, f: math.sin(t * f * 2*math.pi) + math.sin(t * f * 4*math.pi)/2,
	lambda t, f: t * f % 1 - 0.5,
]

delay1 = [0] * 1000
delay2 = [0] * 3000
delay3 = [0] * 5000
phaser = [0] * 50

t = 0
for notes in music:
	total = 0
	for note in notes:
		total = total + instruments[note[0]](t/32000, 440 * 2**(note[1]/12)) * note[2]

	total = total * (math.sin(t/32000 * 20 * 2*math.pi)/8+7/8)
	total += delay1.pop(0) * 0.1
	total += delay2.pop(0) * 0.3
	total += delay3.pop(0) * 0.4
	delay1.append(total)
	delay2.append(total)
	delay3.append(total)

	lfo = math.sin(t/32000 * 0.2 * 2*math.pi)
	phaser.append(total)
	phaser.pop(0)
	total += phaser[int((lfo/2+0.5)*(len(phaser)-1))]

	encoder.write(total * 0.1)
	t = t + 1