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import audio
def from_file(file, frame):
ln = -1
while ln:
ln = file.readinto(frame)
yield frame
def reverb_gen(src, buckets, reflect, fadeout):
bucket_count = len(buckets)
bucket = 0
for frame in src:
echo = buckets[bucket]
echo *= reflect
echo += frame
yield echo
buckets[bucket] = echo
bucket += 1
if bucket == bucket_count:
bucket = 0
while fadeout:
fadeout -= 1
echo = buckets[bucket]
echo *= reflect
yield echo
buckets[bucket] = echo
bucket += 1
if bucket == bucket_count:
bucket = 0
def reverb(src, delay, reflect):
#Do all allocation up front, so we don't need to do any in the generator.
bucket_count = delay>>2
buckets = [ None ] * bucket_count
for i in range(bucket_count):
buckets[i] = audio.AudioFrame()
vol = 1.0
fadeout = 0
while vol > 0.05:
fadeout += bucket_count
vol *= reflect
return reverb_gen(src, buckets, reflect, fadeout)
def play_file(name, delay=80, reflect=0.5):
#Do allocation here, as we can't do it in an interrupt.
frame = audio.AudioFrame()
with open(name) as file:
gen = from_file(file, frame)
r = reverb(gen, delay, reflect)
audio.play(r)
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