add op25_audio_tx.py
git-svn-id: http://op25.osmocom.org/svn/trunk@189 65a5c917-d112-43f1-993d-58c26a4786be
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#!/usr/bin/env python
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#
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# Copyright 2005,2006,2007 Free Software Foundation, Inc.
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#
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# GNU Radio Multichannel APCO P25 Tx (c) Copyright 2009, KA1RBI
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#
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# This file is part of GNU Radio and part of OP25
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3, or (at your option)
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# any later version.
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#
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# It is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this; see the file COPYING. If not, write to
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# the Free Software Foundation, Inc., 51 Franklin Street,
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# Boston, MA 02110-1301, USA.
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"""
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This program is used in conjunction with op25_tx.py.
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When op25_tx.py is used with its -p option (selecting UDP input),
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you should start this program beforehand, to start the data flow.
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"""
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import math
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from gnuradio import gr, gru, audio, eng_notation, blks2, optfir
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from gnuradio.eng_option import eng_option
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from optparse import OptionParser
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from gnuradio import op25_imbe
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import op25_c4fm_mod
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class app_top_block(gr.top_block):
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def __init__(self, options, queue):
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gr.top_block.__init__(self, "mhp")
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self.audio_amps = []
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self.converters = []
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self.vocoders = []
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self.filters = []
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self.c4fm = []
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self.output_gain = []
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input_audio_rate = 8000
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output_audio_rate = 48000
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c4fm_rate = 96000
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self.audio_input = audio.source(input_audio_rate, options.audio_input)
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self.audio_output = audio.sink (output_audio_rate, options.audio_output)
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for i in range (options.nchannels):
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t = gr.multiply_const_ff(32767 * options.audio_gain)
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self.audio_amps.append(t)
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t = gr.float_to_short()
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self.converters.append(t)
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t = op25_imbe.vocoder(True, # 0=Decode,True=Encode
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options.verbose, # Verbose flag
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options.stretch, # flex amount
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"", # udp ip address
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0, # udp port
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False) # dump raw u vectors
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self.vocoders.append(t)
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t = op25_c4fm_mod.p25_mod(output_sample_rate=c4fm_rate,
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log=False,
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verbose=True)
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self.c4fm.append(t)
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# FIXME: it would seem as if direct output at 48000 would be the
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# obvious way to go, but for unknown reasons, it produces hideous
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# distortion in the output waveform. For the same unknown
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# reasons, it's clean if we output at 96000 and then decimate
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# back down to 48k...
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t = blks2.rational_resampler_fff(1, 2) # 96000 -> 48000
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self.filters.append(t)
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t = gr.multiply_const_ff(options.output_gain)
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self.output_gain.append(t)
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for i in range (options.nchannels):
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self.connect(self.audio_amps[i], self.converters[i], self.vocoders[i], self.c4fm[i], self.filters[i], self.output_gain[i])
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if options.nchannels == 1:
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self.connect(self.audio_input, self.audio_amps[0])
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self.connect(self.output_gain[0], self.audio_output)
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else:
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for i in range (options.nchannels):
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self.connect((self.audio_input, i), self.audio_amps[i])
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self.connect(self.output_gain[i], (self.audio_output, i))
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def main():
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parser = OptionParser(option_class=eng_option)
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parser.add_option("-g", "--audio-gain", type="eng_float", default=1.0, help="input gain factor")
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parser.add_option("-G", "--output-gain", type="eng_float", default=0.6, help="output gain factor")
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parser.add_option("-n", "--nchannels", type="int", default=2, help="number of audio channels")
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parser.add_option("-v", "--verbose", action="store_true", default=False, help="dump demodulation data")
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parser.add_option("-I", "--audio-input", type="string", default="", help="pcm input device name. E.g., hw:0,0 or /dev/dsp")
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parser.add_option("-O", "--audio-output", type="string", default="", help="pcm output device name. E.g., hw:0,0 or /dev/dsp")
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parser.add_option("-S", "--stretch", type="int", default=0)
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(options, args) = parser.parse_args()
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queue = gr.msg_queue()
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tb = app_top_block(options, queue)
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try:
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tb.start()
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while 1:
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if not queue.empty_p():
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sys.stderr.write("main: q.delete_head()\n")
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msg = queue.delete_head()
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except KeyboardInterrupt:
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tb.stop()
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if __name__ == "__main__":
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main()
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