added morse library (not finished yet)

Mac/Demo/sound/morselib.py

@@ -0,0 +1,188 @@
+"""Translate text strings to Morse code"""
+
+FRAMERATE = 22050
+SAMPWIDTH = 2
+
+BASEFREQ = 441
+OCTAVE = 2
+
+DOT = 30
+DAH = 80
+
+morsetab = {
+	'a': '.-',
+	'b': '-...',
+	'c': '-.-.',
+	'd': '-..',
+	'e': '.',
+	'f': '..-.',
+	'g': '--.',
+	'h': '....',
+	'i': '..',
+	'j': '.---',
+	'k': '-.-',
+	'l': '.-..',
+	'm': '--',
+	'n': '-.',
+	'o': '---',
+	'p': '.--.',
+	'q': '--.-',
+	'r': '.-.',
+	's': '...',
+	't': '-',
+	'u': '..-',
+	'v': '...-',
+	'w': '.--',
+	'x': '-..-',
+	'y': '-.--',
+	'z': '--..',
+	'0': '-----',
+	'1': '.----',
+	'2': '..---',
+	'3': '...--',
+	'4': '....-',
+	'5': '.....',
+	'6': '-....',
+	'7': '--...',
+	'8': '---..',
+	'9': '----.',
+	',': '--..--',
+	'.': '.-.-.-',
+	'?': '..--..',
+	';': '-.-.-.',
+	':': '---...',
+	"'": '.----.',
+	'-': '-....-',
+	'/': '-..-.',
+	'(': '-.--.-',
+	')': '-.--.-', # XXX same as code for '(' ???
+	'_': '..--.-',
+	' ': ' '
+}
+
+def morsecode(s):
+	from string import lower
+	m = ''
+	for c in s:
+		c = lower(c)
+		if morsetab.has_key(c):
+			c = morsetab[c] + ' '
+		else:
+			c = '? '
+		m = m + c
+	return m
+
+
+class BaseMorse:
+	"base class for morse transmissions" 
+	
+	def __init__(self):
+		"constructor"
+		self.dots = DOT
+		self.dahs = DAH
+	
+	def noise(self, duration):
+		"beep for given duration"
+		pass
+	
+	def pause(self, duration):
+		"pause for given duration"
+		pass
+	
+	def dot(self):
+		"short beep"
+		self.noise(self.dots)
+	
+	def dah(self):
+		"long beep"
+		self.noise(self.dahs)
+	
+	def pdot(self):
+		"pause as long as a dot"
+		self.pause(self.dots)
+	
+	def pdah(self):
+		"pause as long as a dah"
+		self.pause(self.dahs)
+	
+	def sendmorse(self, s):
+		for c in s:
+			if c == '.': self.dot()
+			elif c == '-': self.dah()
+			else: self.pdah()
+			self.pdot()
+	
+	def sendascii(self, s):
+		self.sendmorse(morsecode(s))
+	
+	def send(self, s):
+		self.sendascii(s)
+
+
+import Audio_mac
+class MyAudio(Audio_mac.Play_Audio_mac):
+	def _callback(self, *args):
+		if hasattr(self, 'usercallback'): self.usercallback()
+		apply(Audio_mac.Play_Audio_mac._callback, (self,) + args)
+
+
+class MacMorse(BaseMorse):
+	"Mac specific class to play Morse code"
+	
+	def __init__(self):
+		BaseMorse.__init__(self)
+		self.dev = MyAudio()
+		self.dev.setoutrate(FRAMERATE)
+		self.dev.setsampwidth(SAMPWIDTH)
+		self.dev.setnchannels(1)
+		self.dev.usercallback = self.usercallback
+		sinewave = ''
+		n = int(FRAMERATE / BASEFREQ)
+		octave = OCTAVE
+		from math import sin, pi
+		for i in range(n):
+			val = int(sin(2 * pi * i * octave / n) * 0x7fff)
+			sample = chr((val >> 8) & 255) + chr(val & 255)
+			sinewave = sinewave + sample[:SAMPWIDTH]
+		self.sinewave = sinewave
+		self.silence = '\0' * (n*SAMPWIDTH)
+		self.morsequeue = ''
+	
+	def __del__(self):
+		self.close()
+	
+	def close(self):
+		self.dev = None
+	
+	def pause(self, duration):
+		self.dev.writeframes(self.silence * duration)
+	
+	def noise(self, duration):
+		self.dev.writeframes(self.sinewave * duration)
+	
+	def sendmorse(self, s):
+		self.morsequeue = self.morsequeue + s
+		self.dev.usercallback()
+		self.dev.usercallback()
+		self.dev.usercallback()
+	
+	def usercallback(self):
+		if self.morsequeue:
+			c, self.morsequeue = self.morsequeue[0], self.morsequeue[1:]
+			if c == '.': self.dot()
+			elif c == '-': self.dah()
+			else: self.pdah()
+			self.pdot()
+
+
+def test():
+	m = MacMorse()
+	while 1:
+		try:
+			line = raw_input('Morse line: ')
+		except (EOFError, KeyboardInterrupt):
+			break
+		m.send(line)
+		while m.morsequeue: pass
+
+test()