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180 lines
4 KiB
Python
180 lines
4 KiB
Python
import sys, math, audiodev
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DOT = 30
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DAH = 80
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OCTAVE = 2 # 1 == 441 Hz, 2 == 882 Hz, ...
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SAMPWIDTH = 2
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FRAMERATE = 44100
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BASEFREQ = 441
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QSIZE = 20000
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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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'?': '..--..',
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';': '-.-.-.',
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':': '---...',
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"'": '.----.',
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'-': '-....-',
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'/': '-..-.',
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'(': '-.--.-',
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')': '-.--.-',
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'_': '..--.-',
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' ': ' '
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}
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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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global sinewave, nowave
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sinewave = ''
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n = int(FRAMERATE / BASEFREQ)
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for i in range(n):
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val = int(math.sin(2 * math.pi * i * octave / n) * 0x7fff)
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sample = chr((val >> 8) & 255) + chr(val & 255)
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sinewave = sinewave + sample[:SAMPWIDTH]
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nowave = '\0' * (n*SAMPWIDTH)
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mkwave(OCTAVE)
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class BufferedAudioDev:
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def __init__(self, *args):
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import audiodev
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self._base = apply(audiodev.AudioDev, args)
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self._buffer = []
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self._filled = 0
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self._addmethods(self._base, self._base.__class__)
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def _addmethods(self, inst, cls):
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for name in cls.__dict__.keys():
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if not hasattr(self, name):
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try:
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setattr(self, name, getattr(inst, name))
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except:
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pass
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for basecls in cls.__bases__:
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self._addmethods(self, inst, basecls)
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def writeframesraw(self, frames):
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self._buffer.append(frames)
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self._filled = self._filled + len(frames)
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if self._filled >= QSIZE:
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self.flush()
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def wait(self):
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self.flush()
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self._base.wait()
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def flush(self):
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print 'flush: %d blocks, %d bytes' % (len(self._buffer), self._filled)
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if self._buffer:
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import string
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self._base.writeframes(string.joinfields(self._buffer, ''))
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self._buffer = []
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self._filled = 0
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def main(args = sys.argv[1:]):
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import getopt, string
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try:
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opts, args = getopt.getopt(args, '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 ] [ args ] ...\n')
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sys.exit(1)
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dev = None
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for o, a in opts:
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if o == '-o':
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import aifc
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dev = aifc.open(a, 'w')
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dev.setframerate(FRAMERATE)
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dev.setsampwidth(SAMPWIDTH)
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dev.setnchannels(1)
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if o == '-p':
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mkwave(string.atoi(a))
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if not dev:
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dev = BufferedAudioDev()
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dev.setoutrate(FRAMERATE)
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dev.setsampwidth(SAMPWIDTH)
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dev.setnchannels(1)
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dev.close = dev.stop
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if args:
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line = string.join(args)
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else:
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line = sys.stdin.readline()
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while line:
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print line
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mline = morse(line)
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print mline
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play(mline, dev)
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if hasattr(dev, 'wait'):
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dev.wait()
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if not args:
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line = sys.stdin.readline()
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else:
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line = ''
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dev.close()
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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 = 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, dev):
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for c in line:
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if c == '.':
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sine(dev, DOT)
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elif c == '-':
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sine(dev, DAH)
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else:
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pause(dev, DAH)
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pause(dev, DOT)
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def sine(dev, length):
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dev.writeframesraw(sinewave*length)
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def pause(dev, length):
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dev.writeframesraw(nowave*length)
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if __name__ == '__main__' or sys.argv[0] == __name__:
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main()
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