def _make_ydata(chunk, step): ydata = [] for i in range(0, len(chunk), step): piece = audio.chr2num(chunk[i:i+step]) mi, ma = min(piece), max(piece) y = max(abs(mi), abs(ma)) ydata.append(y) return ydata
def c2i(data):
if type(data) <> type('') or len(data) <> 4:
raise error, 'c2i: bad arg (not string[4])'
bytes = audio.chr2num(data)
for i in (1, 2, 3):
if bytes[i] < 0:
bytes[i] = bytes[i] + 256
return ((bytes[0]*256 + bytes[1])*256 + bytes[2])*256 + bytes[3]
def _make_ydata(chunk, step):
ydata = []
for i in range(0, len(chunk), step):
piece = audio.chr2num(chunk[i:i+step])
mi, ma = min(piece), max(piece)
y = max(abs(mi), abs(ma))
ydata.append(y)
return ydata
def softclip(s):
if '\177' not in s and '\200' not in s:
return s
num = audio.chr2num(s)
extremes = (-128, 127)
for i in range(1, len(num)-1):
if num[i] in extremes:
num[i] = (num[i-1] + num[i+1]) / 2
return audio.num2chr(num)
def unbias(s):
if not s: return s
a = audio.chr2num(s)
sum = 0
for i in a: sum = sum + i
bias = (sum + len(a)/2) / len(a)
print 'Bias value:', bias
if bias:
for i in range(len(a)):
a[i] = a[i] - bias
s = audio.num2chr(a)
return s
def timer(self): if self.sampling: chunk = audio.wait_recording() self.sampling = 0 nums = audio.chr2num(chunk) ampl = max(abs(min(nums)), abs(max(nums))) self.append(ampl) if self.enabled and not self.sampling: audio.setrate(self.rate) size = Rates[self.rate]/10 size = size/48*48 audio.start_recording(size) self.sampling = 1 if self.sampling: self.parent.settimer(1)
def timer(self): if self.sampling: chunk = audio.wait_recording() self.sampling = 0 nums = audio.chr2num(chunk) ampl = max(abs(min(nums)), abs(max(nums))) self.append(ampl) if self.enabled and not self.sampling: audio.setrate(self.rate) size = Rates[self.rate]/10 size = size/48*48 audio.start_recording(size) self.sampling = 1 if self.sampling: self.parent.settimer(1)
def stretch(s, a, b):
y = audio.chr2num(s)
m = len(y)
out = []
n = m * b / a
# i, j will walk through y and out (step 1)
# ib, ja are i*b, j*a and are kept as close together as possible
i, ib = 0, 0
j, ja = 0, 0
for j in range(n):
ja = ja+a
while ib < ja:
i = i+1
ib = ib+b
if i >= m:
break
if ib = ja:
out.append(y[i])
else:
out.append((y[i]*(ja-(ib-b)) + y[i-1]*(ib-ja)) / b)
