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#!/usr/bin/env python
#
# Copyright 2005-2007,2009,2011 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, blks2, audio, uhd
from gnuradio import eng_notation
from gnuradio.eng_option import eng_option
from optparse import OptionParser
from gnuradio import digital
from gnuradio import vocoder
import random
import time
import struct
import sys
# from current dir
from transmit_path import transmit_path
from uhd_interface import uhd_transmitter
#import os
#print os.getpid()
#raw_input('Attach and press enter')
class audio_rx(gr.hier_block2):
def __init__(self, audio_input_dev):
gr.hier_block2.__init__(self, "audio_rx",
gr.io_signature(0, 0, 0), # Input signature
gr.io_signature(0, 0, 0)) # Output signature
self.sample_rate = sample_rate = 8000
src = audio.source(sample_rate, audio_input_dev)
src_scale = gr.multiply_const_ff(32767)
f2s = gr.float_to_short()
voice_coder = vocoder.gsm_fr_encode_sp()
self.packets_from_encoder = gr.msg_queue()
packet_sink = gr.message_sink(33, self.packets_from_encoder, False)
self.connect(src, src_scale, f2s, voice_coder, packet_sink)
def get_encoded_voice_packet(self):
return self.packets_from_encoder.delete_head()
class my_top_block(gr.top_block):
def __init__(self, modulator_class, options):
gr.top_block.__init__(self)
self.txpath = transmit_path(modulator_class, options)
self.audio_rx = audio_rx(options.audio_input)
if(options.tx_freq is not None):
self.sink = uhd_transmitter(options.address, options.bitrate,
options.samples_per_symbol,
options.tx_freq, options.tx_gain,
options.antenna, options.verbose)
options.samples_per_symbol = self.sink._sps
audio_rate = self.audio_rx.sample_rate
usrp_rate = self.sink.get_sample_rate()
rrate = usrp_rate / audio_rate
elif(options.to_file is not None):
self.sink = gr.file_sink(gr.sizeof_gr_complex, options.to_file)
rrate = 1
else:
self.sink = gr.null_sink(gr.sizeof_gr_complex)
rrate = 1
self.resampler = blks2.pfb_arb_resampler_ccf(rrate)
self.connect(self.audio_rx)
self.connect(self.txpath, self.resampler, self.sink)
# /////////////////////////////////////////////////////////////////////////////
# main
# /////////////////////////////////////////////////////////////////////////////
def main():
def send_pkt(payload='', eof=False):
return tb.txpath.send_pkt(payload, eof)
def rx_callback(ok, payload):
print "ok = %r, payload = '%s'" % (ok, payload)
mods = digital.modulation_utils.type_1_mods()
parser = OptionParser(option_class=eng_option, conflict_handler="resolve")
expert_grp = parser.add_option_group("Expert")
parser.add_option("-m", "--modulation", type="choice", choices=mods.keys(),
default='gmsk',
help="Select modulation from: %s [default=%%default]"
% (', '.join(mods.keys()),))
parser.add_option("-M", "--megabytes", type="eng_float", default=0,
help="set megabytes to transmit [default=inf]")
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("","--to-file", default=None,
help="Output file for modulated samples")
transmit_path.add_options(parser, expert_grp)
uhd_transmitter.add_options(parser)
for mod in mods.values():
mod.add_options(expert_grp)
parser.set_defaults(bitrate=50e3) # override default bitrate default
(options, args) = parser.parse_args ()
if len(args) != 0:
parser.print_help()
sys.exit(1)
if options.to_file is None:
if options.tx_freq is None:
sys.stderr.write("You must specify -f FREQ or --freq FREQ\n")
parser.print_help(sys.stderr)
sys.exit(1)
# build the graph
tb = my_top_block(mods[options.modulation], options)
r = gr.enable_realtime_scheduling()
if r != gr.RT_OK:
print "Warning: failed to enable realtime scheduling"
tb.start() # start flow graph
# generate and send packets
nbytes = int(1e6 * options.megabytes)
n = 0
pktno = 0
while nbytes == 0 or n < nbytes:
packet = tb.audio_rx.get_encoded_voice_packet()
s = packet.to_string()
send_pkt(s)
n += len(s)
sys.stderr.write('.')
pktno += 1
send_pkt(eof=True)
tb.wait() # wait for it to finish
if __name__ == '__main__':
try:
main()
except KeyboardInterrupt:
pass
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