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#!/usr/bin/env python
#
# Copyright 2007 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# GNU Radio is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# GNU Radio is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU Radio; see the file COPYING. If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#
from gnuradio import gr, blks
from gnuradio import audio
from gnuradio.eng_option import eng_option
from optparse import OptionParser
def main():
parser = OptionParser(option_class=eng_option)
parser.add_option("-I", "--audio-input", type="string", default="",
help="pcm input device name. E.g., hw:0,0 or /dev/dsp")
parser.add_option("-O", "--audio-output", type="string", default="",
help="pcm output device name. E.g., hw:0,0 or /dev/dsp")
parser.add_option("-r", "--sample-rate", type="eng_float", default="32000",
help="Audio sampling rate [defaul=%default]")
parser.add_option("-S", "--resample-rate", type="int", default="8",
help="Resampling rate in CVSD [default=%default]")
(options, args) = parser.parse_args ()
if len(args) != 0:
parser.print_help()
raise SystemExit, 1
fg = gr.flow_graph()
src = audio.source(int(options.sample_rate), options.audio_input)
tx = blks.cvsd_encode(fg, options.resample_rate)
# todo: add noise
rx = blks.cvsd_decode(fg, options.resample_rate)
dst = audio.sink(int(options.sample_rate), options.audio_output)
fg.connect(src, tx, rx, dst)
fg.start()
raw_input ('Press Enter to exit: ')
fg.stop()
if __name__ == '__main__':
try:
main()
except KeyboardInterrupt:
pass
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