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#!/usr/bin/env python
#
# Copyright 2006,2007,2010 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 3, 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
from argparse import ArgumentParser
import sys
try:
from gnuradio import analog
except ImportError:
sys.stderr.write("This example requires gr-analog.\n")
try:
from gnuradio import blocks
except ImportError:
sys.stderr.write("This example requires gr-blocks.\n")
class dial_tone_source(gr.top_block):
def __init__(self, host, port, pkt_size, sample_rate, eof):
gr.top_block.__init__(self, "dial_tone_source")
amplitude = 0.3
src0 = analog.sig_source_f(sample_rate, analog.GR_SIN_WAVE, 350, amplitude)
src1 = analog.sig_source_f(sample_rate, analog.GR_SIN_WAVE, 440, amplitude)
add = blocks.add_ff()
# Throttle needed here to account for the other side's audio card sampling rate
thr = blocks.throttle(gr.sizeof_float, sample_rate)
sink = blocks.udp_sink(gr.sizeof_float, host, port, pkt_size, eof=eof)
self.connect(src0, (add, 0))
self.connect(src1, (add, 1))
self.connect(add, thr, sink)
if __name__ == '__main__':
parser = ArgumentParser()
parser.add_argument("--host", default="127.0.0.1",
help="Remote host name (domain name or IP address")
parser.add_argument("--port", type=int, default=65500,
help="port number to connect to")
parser.add_argument("--packet-size", type=int, default=1472,
help="packet size.")
parser.add_argument("-r", "--sample-rate", type=int, default=8000,
help="audio signal sample rate [default=%(default)r]")
parser.add_argument("--no-eof", action="store_true", default=False,
help="don't send EOF on disconnect")
args = parser.parse_args()
# Create an instance of a hierarchical block
top_block = dial_tone_source(args.host, args.port,
args.packet_size, args.sample_rate,
not args.no_eof)
try:
# Run forever
top_block.run()
except KeyboardInterrupt:
# Ctrl-C exits
pass
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