1 """Translate text strings to Morse code""" 2 3 FRAMERATE = 22050 4 SAMPWIDTH = 2 5 6 BASEFREQ = 441 7 OCTAVE = 2 8 9 DOT = 30 10 DAH = 80 11 12 morsetab = { 13 'a': '.-', 14 'b': '-...', 15 'c': '-.-.', 16 'd': '-..', 17 'e': '.', 18 'f': '..-.', 19 'g': '--.', 20 'h': '....', 21 'i': '..', 22 'j': '.---', 23 'k': '-.-', 24 'l': '.-..', 25 'm': '--', 26 'n': '-.', 27 'o': '---', 28 'p': '.--.', 29 'q': '--.-', 30 'r': '.-.', 31 's': '...', 32 't': '-', 33 'u': '..-', 34 'v': '...-', 35 'w': '.--', 36 'x': '-..-', 37 'y': '-.--', 38 'z': '--..', 39 '0': '-----', 40 '1': '.----', 41 '2': '..---', 42 '3': '...--', 43 '4': '....-', 44 '5': '.....', 45 '6': '-....', 46 '7': '--...', 47 '8': '---..', 48 '9': '----.', 49 ',': '--..--', 50 '.': '.-.-.-', 51 '?': '..--..', 52 ';': '-.-.-.', 53 ':': '---...', 54 "'": '.----.', 55 '-': '-....-', 56 '/': '-..-.', 57 '(': '-.--.-', 58 ')': '-.--.-', # XXX same as code for '(' ??? 59 '_': '..--.-', 60 ' ': ' ' 61 } 62 63 def morsecode(s): 64 from string import lower 65 m = '' 66 for c in s: 67 c = lower(c) 68 if morsetab.has_key(c): 69 c = morsetab[c] + ' ' 70 else: 71 c = '? ' 72 m = m + c 73 return m 74 75 76 class BaseMorse: 77 "base class for morse transmissions" 78 79 def __init__(self): 80 "constructor" 81 self.dots = DOT 82 self.dahs = DAH 83 84 def noise(self, duration): 85 "beep for given duration" 86 pass 87 88 def pause(self, duration): 89 "pause for given duration" 90 pass 91 92 def dot(self): 93 "short beep" 94 self.noise(self.dots) 95 96 def dah(self): 97 "long beep" 98 self.noise(self.dahs) 99 100 def pdot(self): 101 "pause as long as a dot" 102 self.pause(self.dots) 103 104 def pdah(self): 105 "pause as long as a dah" 106 self.pause(self.dahs) 107 108 def sendmorse(self, s): 109 for c in s: 110 if c == '.': self.dot() 111 elif c == '-': self.dah() 112 else: self.pdah() 113 self.pdot() 114 115 def sendascii(self, s): 116 self.sendmorse(morsecode(s)) 117 118 def send(self, s): 119 self.sendascii(s) 120 121 122 import Audio_mac 123 class MyAudio(Audio_mac.Play_Audio_mac): 124 def _callback(self, *args): 125 if hasattr(self, 'usercallback'): self.usercallback() 126 apply(Audio_mac.Play_Audio_mac._callback, (self,) + args) 127 128 129 class MacMorse(BaseMorse): 130 "Mac specific class to play Morse code" 131 132 def __init__(self): 133 BaseMorse.__init__(self) 134 self.dev = MyAudio() 135 self.dev.setoutrate(FRAMERATE) 136 self.dev.setsampwidth(SAMPWIDTH) 137 self.dev.setnchannels(1) 138 self.dev.usercallback = self.usercallback 139 sinewave = '' 140 n = int(FRAMERATE / BASEFREQ) 141 octave = OCTAVE 142 from math import sin, pi 143 for i in range(n): 144 val = int(sin(2 * pi * i * octave / n) * 0x7fff) 145 sample = chr((val >> 8) & 255) + chr(val & 255) 146 sinewave = sinewave + sample[:SAMPWIDTH] 147 self.sinewave = sinewave 148 self.silence = '\0' * (n*SAMPWIDTH) 149 self.morsequeue = '' 150 151 def __del__(self): 152 self.close() 153 154 def close(self): 155 self.dev = None 156 157 def pause(self, duration): 158 self.dev.writeframes(self.silence * duration) 159 160 def noise(self, duration): 161 self.dev.writeframes(self.sinewave * duration) 162 163 def sendmorse(self, s): 164 self.morsequeue = self.morsequeue + s 165 self.dev.usercallback() 166 self.dev.usercallback() 167 self.dev.usercallback() 168 169 def usercallback(self): 170 if self.morsequeue: 171 c, self.morsequeue = self.morsequeue[0], self.morsequeue[1:] 172 if c == '.': self.dot() 173 elif c == '-': self.dah() 174 else: self.pdah() 175 self.pdot() 176 177 178 def test(): 179 m = MacMorse() 180 while 1: 181 try: 182 line = raw_input('Morse line: ') 183 except (EOFError, KeyboardInterrupt): 184 break 185 m.send(line) 186 while m.morsequeue: pass 187 188 test() 189
