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-rwxr-xr-xDemo/scripts/morse.py128
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diff --git a/Demo/scripts/morse.py b/Demo/scripts/morse.py
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--- a/Demo/scripts/morse.py
+++ /dev/null
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-#! /usr/bin/env python
-
-# DAH should be three DOTs.
-# Space between DOTs and DAHs should be one DOT.
-# Space between two letters should be one DAH.
-# Space between two words should be DOT DAH DAH.
-
-import sys, math, aifc
-from contextlib import closing
-
-DOT = 30
-DAH = 3 * DOT
-OCTAVE = 2 # 1 == 441 Hz, 2 == 882 Hz, ...
-
-morsetab = {
- 'A': '.-', 'a': '.-',
- 'B': '-...', 'b': '-...',
- 'C': '-.-.', 'c': '-.-.',
- 'D': '-..', 'd': '-..',
- 'E': '.', 'e': '.',
- 'F': '..-.', 'f': '..-.',
- 'G': '--.', 'g': '--.',
- 'H': '....', 'h': '....',
- 'I': '..', 'i': '..',
- 'J': '.---', 'j': '.---',
- 'K': '-.-', 'k': '-.-',
- 'L': '.-..', 'l': '.-..',
- 'M': '--', 'm': '--',
- 'N': '-.', 'n': '-.',
- 'O': '---', 'o': '---',
- 'P': '.--.', 'p': '.--.',
- 'Q': '--.-', 'q': '--.-',
- 'R': '.-.', 'r': '.-.',
- 'S': '...', 's': '...',
- 'T': '-', 't': '-',
- 'U': '..-', 'u': '..-',
- 'V': '...-', 'v': '...-',
- 'W': '.--', 'w': '.--',
- 'X': '-..-', 'x': '-..-',
- 'Y': '-.--', 'y': '-.--',
- 'Z': '--..', 'z': '--..',
- '0': '-----', ',': '--..--',
- '1': '.----', '.': '.-.-.-',
- '2': '..---', '?': '..--..',
- '3': '...--', ';': '-.-.-.',
- '4': '....-', ':': '---...',
- '5': '.....', "'": '.----.',
- '6': '-....', '-': '-....-',
- '7': '--...', '/': '-..-.',
- '8': '---..', '(': '-.--.-',
- '9': '----.', ')': '-.--.-',
- ' ': ' ', '_': '..--.-',
-}
-
-nowave = b'\0' * 200
-
-# If we play at 44.1 kHz (which we do), then if we produce one sine
-# wave in 100 samples, we get a tone of 441 Hz. If we produce two
-# sine waves in these 100 samples, we get a tone of 882 Hz. 882 Hz
-# appears to be a nice one for playing morse code.
-def mkwave(octave):
- sinewave = bytearray()
- for i in range(100):
- val = int(math.sin(math.pi * i * octave / 50.0) * 30000)
- sinewave.extend([(val >> 8) & 255, val & 255])
- return bytes(sinewave)
-
-defaultwave = mkwave(OCTAVE)
-
-def main():
- import getopt
- try:
- opts, args = getopt.getopt(sys.argv[1:], 'o:p:')
- except getopt.error:
- sys.stderr.write('Usage ' + sys.argv[0] +
- ' [ -o outfile ] [ -p octave ] [ words ] ...\n')
- sys.exit(1)
- wave = defaultwave
- outfile = 'morse.aifc'
- for o, a in opts:
- if o == '-o':
- outfile = a
- if o == '-p':
- wave = mkwave(int(a))
- with closing(aifc.open(outfile, 'w')) as fp:
- fp.setframerate(44100)
- fp.setsampwidth(2)
- fp.setnchannels(1)
- if args:
- source = [' '.join(args)]
- else:
- source = iter(sys.stdin.readline, '')
- for line in source:
- mline = morse(line)
- play(mline, fp, wave)
-
-# Convert a string to morse code with \001 between the characters in
-# the string.
-def morse(line):
- res = ''
- for c in line:
- try:
- res += morsetab[c] + '\001'
- except KeyError:
- pass
- return res
-
-# Play a line of morse code.
-def play(line, fp, wave):
- for c in line:
- if c == '.':
- sine(fp, DOT, wave)
- elif c == '-':
- sine(fp, DAH, wave)
- else: # space
- pause(fp, DAH + DOT)
- pause(fp, DOT)
-
-def sine(fp, length, wave):
- for i in range(length):
- fp.writeframesraw(wave)
-
-def pause(fp, length):
- for i in range(length):
- fp.writeframesraw(nowave)
-
-if __name__ == '__main__':
- main()