"""
Niveau 4
Jouer des accords

Ne pas introduire le facteur d'amplitude avant d'avoir entendu le résultat sans lui
"""

import synthlib, math, sys

music = synthlib.midi()

active = {}
wait = 0
tt = 0
t = 0
loop = True

sound_encoder = synthlib.SoundEncoder()
while loop:
	if wait == 0:
		while True:
			event = music[tt]
			tt += 1
			if event.type == synthlib.Note:
				if event.velocity == 0:
					if event.number in active:
						active.pop(event.number)
					sys.stderr.write("pop "+str(event.number)+"\n")
				else:
					active[event.number] = event.velocity
					sys.stderr.write(str(event.velocity)+"  "+str(event.number)+"  ("+str(len(active))+")\n")
			elif event.type == synthlib.Wait:
				wait = int(event.value*8000)
				break
			elif event.type == synthlib.End:
				loop = False
				break
	else:
		wait -= 1
	
	sound_encoder.write_sample(sum([active[number]*math.sin(t/16000*440*2**(number/12)*2*math.pi) for number in active])/max(1,len(active)))
	t += 1