Initial revision
diff --git a/Lib/irix5/auds.py b/Lib/irix5/auds.py
new file mode 100755
index 0000000..549c0a7
--- /dev/null
+++ b/Lib/irix5/auds.py
@@ -0,0 +1,106 @@
+import audio
+
+RATE = 8192
+
+# Initialize the audio stuff
+audio.setrate(3)
+audio.setoutgain(100) # for speaker
+
+play = audio.write
+
+def samp(n):
+ savegain = audio.getoutgain()
+ try:
+ audio.setoutgain(0)
+ x = raw_input('Hit Enter to sample ' + `n` + ' seconds: ')
+ return audio.read(n*RATE)
+ finally:
+ audio.setoutgain(savegain)
+
+def echo(s, delay, gain):
+ return s[:delay] + audio.add(s[delay:], audio.amplify(s, gain, gain))
+
+def save(s, file):
+ f = open(file, 'w')
+ f.write(s)
+
+def load(file):
+ return loadfp(open(file, 'r'))
+
+def loadfp(fp):
+ s = ''
+ while 1:
+ buf = fp.read(16*1024)
+ if not buf: break
+ s = s + buf
+ return s
+
+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
+
+# Stretch by a/b.
+# Think of this as converting the sampling rate from a samples/sec
+# to b samples/sec. Or, if the input is a bytes long, the output
+# will be b bytes long.
+#
+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)
+ return audio.num2chr(out)
+
+def sinus(freq): # return a 1-second sine wave
+ from math import sin, pi
+ factor = 2.0*pi*float(freq)/float(RATE)
+ list = range(RATE)
+ for i in list:
+ list[i] = int(sin(float(i) * factor) * 127.0)
+ return audio.num2chr(list)
+
+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 demo():
+ gday = load('gday')[1000:6000]
+ save(gday, 'gday0')
+ gg = [gday]
+ for i in range(1, 10):
+ for g in gg: play(g)
+ g = stretch(gday, 10, 10-i)
+ save(g, 'gday' + `i`)
+ gg.append(g)
+ while 1:
+ for g in gg: play(g)