--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pyntnclick/tools/gen_sound.py	Sat Feb 11 17:07:52 2012 +0200
@@ -0,0 +1,57 @@
+# Generate 'perfect' sine wave sounds
+
+# Design notes: produces ~= (use requested) s raw CDDA audio - 44100 Hz
+#                           16 bit signed values
+# Input is freq in Hz - 440 for A, etc. - must be an integer
+# Output is written the file beep<freq>.pcm
+# Convert to ogg with oggenc -r <file>
+
+import sys
+import math
+import struct
+
+CDDA_RATE = 44100
+MAX = 105 * 256  # Max value for sine wave
+
+
+def gen_sine(freq, secs):
+    filename = 'beep%s.pcm' % freq
+    # We need to generate freq cycles and sample that CDDA_RATE times
+    samples_per_cycle = CDDA_RATE / freq
+    data = []
+    for x in range(samples_per_cycle):
+        rad = float(x) / samples_per_cycle * 2 * math.pi
+        y = MAX * math.sin(rad)
+        data.append(struct.pack('<i', y))
+    output = open(filename, 'w')
+    for x in range(int(freq * secs)):
+        output.write(''.join(data))
+    output.close()
+    return filename
+
+
+def usage():
+    print 'Unexpected input'
+    print 'Usage: gen_sound.py <freq> [<length>]'
+    print ' where <freq> is the frequency in Hz (integer)'
+    print ' and [<length>] is the time is seconds (float)'
+
+if __name__ == "__main__":
+    try:
+        freq = int(sys.argv[1])
+    except Exception, exc:
+        usage()
+        print 'Error was: %s' % exc
+        sys.exit(1)
+
+    if len(sys.argv) > 2:
+        try:
+            secs = float(sys.argv[2])
+        except Exception, exc:
+            usage()
+            print 'Error was: %s' % exc
+            sys.exit(1)
+    else:
+        secs = 0.25
+    output = gen_sine(freq, secs)
+    print 'Wrote sample to %s' % output