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op25-legacy/python/op25_audio_tx.py

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5.4 KiB

#!/usr/bin/env python
#
# Copyright 2005,2006,2007 Free Software Foundation, Inc.
#
# GNU Radio Multichannel APCO P25 Tx (c) Copyright 2009, KA1RBI
#
# This file is part of GNU Radio and part of OP25
#
# This program 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.
#
# It 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 this; see the file COPYING. If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
"""
This program is used in conjunction with op25_tx.py.
When op25_tx.py is used with its -p option (selecting UDP input),
you should start this program beforehand, to start the data flow.
"""
import math
from gnuradio import gr, gru, audio, eng_notation, blks2, optfir
from gnuradio.eng_option import eng_option
from optparse import OptionParser
from gnuradio import repeater
import op25_c4fm_mod
class app_top_block(gr.top_block):
def __init__(self, options, queue):
gr.top_block.__init__(self, "mhp")
self.audio_amps = []
self.converters = []
self.vocoders = []
self.filters = []
self.c4fm = []
self.output_gain = []
input_audio_rate = 8000
output_audio_rate = 48000
c4fm_rate = 96000
if not options.input_files:
self.audio_input = audio.source(input_audio_rate, options.audio_input)
self.audio_output = audio.sink (output_audio_rate, options.audio_output)
for i in range (options.nchannels):
if options.input_files:
t = gr.file_source(gr.sizeof_char, "baseband-%d.dat" % i, options.repeat)
self.vocoders.append(t)
else:
t = gr.multiply_const_ff(32767 * options.audio_gain)
self.audio_amps.append(t)
t = gr.float_to_short()
self.converters.append(t)
t = repeater.vocoder(True, # 0=Decode,True=Encode
options.verbose, # Verbose flag
options.stretch, # flex amount
"", # udp ip address
0, # udp port
False) # dump raw u vectors
self.vocoders.append(t)
t = op25_c4fm_mod.p25_mod(output_sample_rate=c4fm_rate,
log=False,
verbose=True)
self.c4fm.append(t)
# FIXME: it would seem as if direct output at 48000 would be the
# obvious way to go, but for unknown reasons, it produces hideous
# distortion in the output waveform. For the same unknown
# reasons, it's clean if we output at 96000 and then decimate
# back down to 48k...
t = blks2.rational_resampler_fff(1, 2) # 96000 -> 48000
self.filters.append(t)
t = gr.multiply_const_ff(options.output_gain)
self.output_gain.append(t)
for i in range (options.nchannels):
if not options.input_files:
self.connect(self.audio_amps[i], self.converters[i], self.vocoders[i])
self.connect(self.vocoders[i], self.c4fm[i], self.filters[i], self.output_gain[i])
if options.nchannels == 1:
if not options.input_files:
self.connect(self.audio_input, self.audio_amps[0])
self.connect(self.output_gain[0], self.audio_output)
else:
for i in range (options.nchannels):
if not options.input_files:
self.connect((self.audio_input, i), self.audio_amps[i])
self.connect(self.output_gain[i], (self.audio_output, i))
def main():
parser = OptionParser(option_class=eng_option)
parser.add_option("-g", "--audio-gain", type="eng_float", default=1.0, help="input gain factor")
parser.add_option("-G", "--output-gain", type="eng_float", default=0.6, help="output gain factor")
parser.add_option("-i", "--input-files", action="store_true", default=False, help="take input from file(s)")
parser.add_option("-n", "--nchannels", type="int", default=2, help="number of audio channels")
parser.add_option("-r", "--repeat", action="store_true", default=False, help="replay input")
parser.add_option("-v", "--verbose", action="store_true", default=False, help="dump demodulation data")
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("-S", "--stretch", type="int", default=0)
(options, args) = parser.parse_args()
queue = gr.msg_queue()
tb = app_top_block(options, queue)
try:
tb.start()
while 1:
if not queue.empty_p():
sys.stderr.write("main: q.delete_head()\n")
msg = queue.delete_head()
except KeyboardInterrupt:
tb.stop()
if __name__ == "__main__":
main()