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128 lines
4 KiB
Python
Executable file
128 lines
4 KiB
Python
Executable file
#! /usr/bin/env python3
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# DAH should be three DOTs.
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# Space between DOTs and DAHs should be one DOT.
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# Space between two letters should be one DAH.
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# Space between two words should be DOT DAH DAH.
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import sys, math, aifc
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from contextlib import closing
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DOT = 30
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DAH = 3 * DOT
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OCTAVE = 2 # 1 == 441 Hz, 2 == 882 Hz, ...
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morsetab = {
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'A': '.-', 'a': '.-',
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'B': '-...', 'b': '-...',
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'C': '-.-.', 'c': '-.-.',
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'D': '-..', 'd': '-..',
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'E': '.', 'e': '.',
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'F': '..-.', 'f': '..-.',
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'G': '--.', 'g': '--.',
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'H': '....', 'h': '....',
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'I': '..', 'i': '..',
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'J': '.---', 'j': '.---',
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'K': '-.-', 'k': '-.-',
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'L': '.-..', 'l': '.-..',
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'M': '--', 'm': '--',
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'N': '-.', 'n': '-.',
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'O': '---', 'o': '---',
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'P': '.--.', 'p': '.--.',
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'Q': '--.-', 'q': '--.-',
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'R': '.-.', 'r': '.-.',
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'S': '...', 's': '...',
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'T': '-', 't': '-',
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'U': '..-', 'u': '..-',
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'V': '...-', 'v': '...-',
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'W': '.--', 'w': '.--',
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'X': '-..-', 'x': '-..-',
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'Y': '-.--', 'y': '-.--',
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'Z': '--..', 'z': '--..',
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'0': '-----', ',': '--..--',
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'1': '.----', '.': '.-.-.-',
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'2': '..---', '?': '..--..',
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'3': '...--', ';': '-.-.-.',
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'4': '....-', ':': '---...',
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'5': '.....', "'": '.----.',
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'6': '-....', '-': '-....-',
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'7': '--...', '/': '-..-.',
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'8': '---..', '(': '-.--.-',
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'9': '----.', ')': '-.--.-',
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' ': ' ', '_': '..--.-',
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}
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nowave = b'\0' * 200
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# If we play at 44.1 kHz (which we do), then if we produce one sine
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# wave in 100 samples, we get a tone of 441 Hz. If we produce two
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# sine waves in these 100 samples, we get a tone of 882 Hz. 882 Hz
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# appears to be a nice one for playing morse code.
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def mkwave(octave):
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sinewave = bytearray()
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for i in range(100):
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val = int(math.sin(math.pi * i * octave / 50.0) * 30000)
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sinewave.extend([(val >> 8) & 255, val & 255])
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return bytes(sinewave)
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defaultwave = mkwave(OCTAVE)
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def main():
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import getopt
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try:
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opts, args = getopt.getopt(sys.argv[1:], 'o:p:')
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except getopt.error:
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sys.stderr.write('Usage ' + sys.argv[0] +
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' [ -o outfile ] [ -p octave ] [ words ] ...\n')
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sys.exit(1)
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wave = defaultwave
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outfile = 'morse.aifc'
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for o, a in opts:
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if o == '-o':
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outfile = a
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if o == '-p':
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wave = mkwave(int(a))
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with closing(aifc.open(outfile, 'w')) as fp:
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fp.setframerate(44100)
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fp.setsampwidth(2)
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fp.setnchannels(1)
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if args:
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source = [' '.join(args)]
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else:
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source = iter(sys.stdin.readline, '')
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for line in source:
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mline = morse(line)
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play(mline, fp, wave)
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# Convert a string to morse code with \001 between the characters in
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# the string.
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def morse(line):
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res = ''
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for c in line:
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try:
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res += morsetab[c] + '\001'
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except KeyError:
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pass
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return res
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# Play a line of morse code.
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def play(line, fp, wave):
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for c in line:
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if c == '.':
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sine(fp, DOT, wave)
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elif c == '-':
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sine(fp, DAH, wave)
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else: # space
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pause(fp, DAH + DOT)
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pause(fp, DOT)
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def sine(fp, length, wave):
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for i in range(length):
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fp.writeframesraw(wave)
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def pause(fp, length):
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for i in range(length):
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fp.writeframesraw(nowave)
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if __name__ == '__main__':
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main()
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