Add simple gensound script

Python/gensound.py

@@ -0,0 +1,58 @@
+import subprocess
+import sys
+"""
+Generate sound wav file and play it.
+tested player on OSX, Ubuntu16.04
+"""
+
+
+RATE = 44100
+
+
+def get_note(note, length=None):
+    import struct
+    from math import sin, pi
+
+    if length is None:
+        length = round(RATE/4)
+
+    wv_data = b""
+    for i in range(0, length):
+        max_vol = 2 ** 15 - 1.0
+        raw = round(max_vol * sin(i * 2 * pi * note / RATE))
+        wv_data += struct.pack('h', raw)
+        wv_data += struct.pack('h', raw)
+    return wv_data
+
+
+def generate_sound_file(filename='noise.wav'):
+    import wave
+
+    noise_output = wave.open(filename, 'w')
+    noise_output.setparams((2, 2, 44100, 0, 'NONE', 'not compressed'))
+
+    A6 = 1760
+    B6 = 1975.53
+    C7 = 2093.00
+    wv_data = b"".join([get_note(n) for n in [A6, B6, C7]])
+
+    noise_output.writeframes(wv_data)
+
+    noise_output.close()
+
+
+filename = 'noise.wav'
+generate_sound_file(filename)
+if sys.platform == 'darwin':
+    subprocess.call(['afplay', filename])
+elif 'win' in sys.platform:
+    subprocess.call(['start', filename])
+else:
+    try:
+        subprocess.call(['xdg-open', filename])
+    except Exception:
+        try:
+            # TODO when this work, switch with xdg-open
+            subprocess.call(['mpg321', filename])
+        except Exception:
+            print("Cannot play sound file")