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Diffstat (limited to 'gr-digital/examples/rx_voice.py')
| -rwxr-xr-x | gr-digital/examples/rx_voice.py | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/gr-digital/examples/rx_voice.py b/gr-digital/examples/rx_voice.py new file mode 100755 index 000000000..b58704e16 --- /dev/null +++ b/gr-digital/examples/rx_voice.py @@ -0,0 +1,164 @@ +#!/usr/bin/env python +# +# Copyright 2005,2006,2009,2011 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 struct +import sys + +# from current dir +from receive_path import receive_path +from uhd_interface import uhd_receiver + +#import os +#print os.getpid() +#raw_input('Attach and press enter') + + +class audio_tx(gr.hier_block2): + def __init__(self, audio_output_dev): + gr.hier_block2.__init__(self, "audio_tx", + gr.io_signature(0, 0, 0), # Input signature + gr.io_signature(0, 0, 0)) # Output signature + + self.sample_rate = sample_rate = 8000 + self.packet_src = gr.message_source(33) + voice_decoder = vocoder.gsm_fr_decode_ps() + s2f = gr.short_to_float () + sink_scale = gr.multiply_const_ff(1.0/32767.) + audio_sink = audio.sink(sample_rate, audio_output_dev) + self.connect(self.packet_src, voice_decoder, s2f, sink_scale, audio_sink) + + def msgq(self): + return self.packet_src.msgq() + + +class my_top_block(gr.top_block): + def __init__(self, demod_class, rx_callback, options): + gr.top_block.__init__(self) + self.rxpath = receive_path(demod_class, rx_callback, options) + self.audio_tx = audio_tx(options.audio_output) + + if(options.rx_freq is not None): + self.source = uhd_receiver(options.address, options.bitrate, + options.samples_per_symbol, + options.rx_freq, options.rx_gain, + options.antenna, options.verbose) + options.samples_per_symbol = self.source._sps + + audio_rate = self.audio_tx.sample_rate + usrp_rate = self.source.get_sample_rate() + rrate = audio_rate / usrp_rate + self.resampler = blks2.pfb_arb_resampler_ccf(rrate) + + self.connect(self.source, self.resampler, self.rxpath) + + elif(options.from_file is not None): + self.thr = gr.throttle(gr.sizeof_gr_complex, options.bitrate) + self.source = gr.file_source(gr.sizeof_gr_complex, options.from_file) + self.connect(self.source, self.thr, self.rxpath) + + else: + self.thr = gr.throttle(gr.sizeof_gr_complex, 1e6) + self.source = gr.null_source(gr.sizeof_gr_complex) + self.connect(self.source, self.thr, self.rxpath) + + self.connect(self.audio_tx) + +# ///////////////////////////////////////////////////////////////////////////// +# main +# ///////////////////////////////////////////////////////////////////////////// + +global n_rcvd, n_right + +def main(): + global n_rcvd, n_right + + n_rcvd = 0 + n_right = 0 + + def rx_callback(ok, payload): + global n_rcvd, n_right + n_rcvd += 1 + if ok: + n_right += 1 + + tb.audio_tx.msgq().insert_tail(gr.message_from_string(payload)) + + print "ok = %r n_rcvd = %4d n_right = %4d" % ( + ok, n_rcvd, n_right) + + demods = digital.modulation_utils2.type_1_demods() + + # Create Options Parser: + parser = OptionParser (option_class=eng_option, conflict_handler="resolve") + expert_grp = parser.add_option_group("Expert") + + parser.add_option("-m", "--modulation", type="choice", choices=demods.keys(), + default='gmsk', + help="Select modulation from: %s [default=%%default]" + % (', '.join(demods.keys()),)) + 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("","--from-file", default=None, + help="input file of samples to demod") + receive_path.add_options(parser, expert_grp) + uhd_receiver.add_options(parser) + + for mod in demods.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.stderr) + sys.exit(1) + + if options.from_file is None: + if options.rx_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(demods[options.modulation], rx_callback, options) + + r = gr.enable_realtime_scheduling() + if r != gr.RT_OK: + print "Warning: Failed to enable realtime scheduling." + + tb.run() + +if __name__ == '__main__': + try: + main() + except KeyboardInterrupt: + pass |