Guido van Rossum | 7aa87cc | 1995-03-10 14:47:05 +0000 | [diff] [blame] | 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() |