119 lines
4.4 KiB
Python
Executable File
119 lines
4.4 KiB
Python
Executable File
#!/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 2009-2013 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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"""
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Transmit 1 narrow band P25 signal using soundcard TX
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"""
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from gnuradio import gr, eng_notation, repeater
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from gnuradio import audio
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from gnuradio import blks2
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from gnuradio.eng_option import eng_option
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from optparse import OptionParser
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import math
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import sys
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import os
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from gnuradio.wxgui import stdgui2, scopesink2
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import wx
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class tx_channel_soundcard(gr.hier_block2):
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def __init__(self, port, gain, soundcard_rate):
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gr.hier_block2.__init__(self, "tx_channel_soundcard",
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gr.io_signature(0, 0, 0),
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gr.io_signature(1, 1, gr.sizeof_float))
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msg_queue = gr.msg_queue(2)
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do_imbe = 1
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do_float = 1
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do_complex = 0
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if soundcard_rate == 96000:
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decim = 1
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else:
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decim = 2 # for 48000
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# per-channel GR source block including these steps:
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# - receive audio chunks from asterisk via UDP
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# - imbe encode
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# - generate float output stream (table lookup method)
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# - generates zero power while no input received
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self.chan = repeater.chan_usrp(port, do_imbe, do_complex, do_float, 1.0, decim, msg_queue)
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self.amp = gr.multiply_const_ff(gain)
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self.connect (self.chan, self.amp, self)
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class fm_tx_block(stdgui2.std_top_block):
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def __init__(self, frame, panel, vbox, argv):
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MAX_CHANNELS = 1
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stdgui2.std_top_block.__init__ (self, frame, panel, vbox, argv)
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parser = OptionParser (option_class=eng_option)
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parser.add_option("-A", "--audio-output", type="string", default="")
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parser.add_option("-d","--debug", action="store_true", default=False)
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parser.add_option("-e","--enable-scope", action="store_true", default=False,
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help="enable c4fm scope")
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parser.add_option("-g", "--gain", type="eng_float", default=1.0,
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help="output gain (default: %default)")
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parser.add_option("-p", "--udp-port", type="int", default=32001,
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help="UDP port number")
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parser.add_option("-s", "--output-sample-rate", type="int", default=48000,
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help="soundcard output sampling rate")
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(options, args) = parser.parse_args ()
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if len(args) != 0:
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parser.print_help()
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sys.exit(1)
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# ----------------------------------------------------------------
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# Set up constants and parameters
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self.soundcard = audio.sink(options.output_sample_rate, options.audio_output)
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# Instantiate TX channel
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t = tx_channel_soundcard(options.udp_port, options.gain, options.output_sample_rate)
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self.connect (t, self.soundcard)
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# plot an FFT to verify we are sending what we want
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if options.enable_scope:
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post_mod = scopesink2.scope_sink_f(panel, title="C4FM Scope",
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fft_size=512, sample_rate=options.output_sample_rate,
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v_scale=5, t_scale=0.001)
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self.connect (t, post_mod)
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vbox.Add (post_mod.win, 1, wx.EXPAND)
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if options.debug:
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# self.debugger = tx_debug_gui.tx_debug_gui(self.subdev)
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# self.debugger.Show(True)
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print "attach pid %d" % os.getpid()
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raw_input("press enter")
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def main ():
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sys.stderr.write("GNU Radio Multichannel APCO P25 Tx (c) Copyright 2009-2013 KA1RBI\n")
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app = stdgui2.stdapp(fm_tx_block, "Multichannel APCO P25 Tx", nstatus=1)
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app.MainLoop ()
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if __name__ == '__main__':
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main ()
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