added Balint's pcm decoder
git-svn-id: http://op25.osmocom.org/svn/trunk@215 65a5c917-d112-43f1-993d-58c26a4786be
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#!/usr/bin/env python
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#
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# Copyright 2004,2005,2006,2007 Free Software Foundation, Inc.
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#
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# This file is part of GNU Radio
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#
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# GNU Radio 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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# GNU Radio 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 GNU Radio; 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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# Original 'usrp_fsk4_oscope.py' modified to work with a normal sound card, WAV files and complex data files.
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# By balint256 on http://tech.groups.yahoo.com/group/op25-dev/
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#
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# Channel filter is only block that decimates
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# Therefore same decimation value must be used as when channel filter was used in previous run so filters are identical
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# Sensitive to gain when using discriminator tap from N-FM demod
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from gnuradio import gr, gru, optfir
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from gnuradio import audio # Soundcard input
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from gnuradio import eng_notation
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from gnuradio.eng_option import eng_option
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from gnuradio.wxgui import stdgui2, scopesink2, form, slider
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from optparse import OptionParser
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import wx
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import sys
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from gnuradio import fsk4
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from math import pi
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import threading
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class app_top_block(stdgui2.std_top_block):
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def __init__( self, frame, panel, vbox, argv):
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stdgui2.std_top_block.__init__( self, frame, panel, vbox, argv)
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self.frame = frame
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self.panel = panel
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self.offset = 0.0 # Channel frequency offset
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parser = OptionParser(option_class=eng_option)
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parser.add_option("-p", "--protocol", type="int", default=1,
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help="set protocol: 0 = RDLAP 19.2kbps; 1 = APCO25 (default)")
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parser.add_option("-g", "--gain", type="eng_float", default=1.0,
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help="set linear input gain (default: %default)")
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parser.add_option("-x", "--freq-translation", type="eng_float", default=0.0,
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help="initial channel frequency translation")
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parser.add_option("-n", "--frame-decim", type="int", default=1,
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help="set oscope frame decimation factor to n [default=1]")
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parser.add_option("-v", "--v-scale", type="eng_float", default=5000,
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help="set oscope initial V/div to SCALE [default=%default]")
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parser.add_option("-t", "--t-scale", type="eng_float", default=49e-6,
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help="set oscope initial s/div to SCALE [default=50us]")
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parser.add_option("-I", "--audio-input", type="string", default="",
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help="pcm input device name. E.g., hw:0,0 or /dev/dsp")
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parser.add_option("-r", "--sample-rate", type="eng_float", default=48000,
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help="set sample rate to RATE (default: %default)")
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parser.add_option("-d", "--channel-decim", type="int", default=None,
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help="set channel decimation factor to n [default depends on protocol]")
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parser.add_option("-w", "--wav-file", type="string", default=None,
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help="WAV input path")
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parser.add_option("-f", "--data-file", type="string", default=None,
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help="Data input path")
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parser.add_option("-B", "--base-band", action="store_true", default=False)
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parser.add_option("-R", "--repeat", action="store_true", default=False)
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parser.add_option("-o", "--wav-out", type="string", default=None,
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help="WAV output path")
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parser.add_option("-G", "--wav-out-gain", type="eng_float", default=0.05,
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help="set WAV output gain (default: %default)")
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parser.add_option("-F", "--data-out", type="string", default=None,
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help="Data output path")
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parser.add_option("-C", "--carrier-freq", type="eng_float", default=None,
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help="set data output carrier frequency to FREQ", metavar="FREQ")
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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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self.options = options
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if options.wav_file is not None:
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#try:
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self.input_file = gr.wavfile_source(options.wav_file, options.repeat)
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#except:
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# print "WAV file not found or not a WAV file"
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# sys.exit(1)
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print "WAV input: %i Hz, %i bits, %i channels" % (self.input_file.sample_rate(), self.input_file.bits_per_sample(), self.input_file.channels())
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self.sample_rate = self.input_file.sample_rate()
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self.input_stream = gr.throttle(gr.sizeof_float, self.sample_rate)
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self.connect(self.input_file, self.input_stream)
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self.src = gr.multiply_const_ff(options.gain)
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elif options.data_file is not None:
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if options.base_band:
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sample_size = gr.sizeof_float
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print "Data file is baseband (float)"
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self.src = gr.multiply_const_ff(options.gain)
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else:
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sample_size = gr.sizeof_gr_complex
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print "Data file is IF (complex)"
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self.src = gr.multiply_const_cc(options.gain)
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self.input_file = gr.file_source(sample_size, options.data_file, options.repeat)
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self.sample_rate = options.sample_rate # E.g. 250000
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print "Data file sampling rate = " + str(self.sample_rate)
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self.input_stream = gr.throttle(sample_size, self.sample_rate)
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self.connect(self.input_file, self.input_stream)
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else:
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self.sample_rate = options.sample_rate
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print "Soundcard sampling rate = " + str(self.sample_rate)
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self.input_stream = audio.source(self.sample_rate, options.audio_input) # float samples
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self.src = gr.multiply_const_ff(options.gain)
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print "Fixed input gain = " + str(options.gain)
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self.connect(self.input_stream, self.src)
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if options.wav_out is not None:
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output_rate = int(self.sample_rate)
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if options.channel_decim is not None:
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output_rate /= options.channel_decim
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self.wav_out = gr.wavfile_sink(options.wav_out, 1, output_rate, 16)
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print "Opened WAV output file: " + options.wav_out + " at rate: " + str(output_rate)
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else:
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self.wav_out = None
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if options.data_out is not None:
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if options.carrier_freq is None:
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self.data_out = gr.file_sink(gr.sizeof_float, options.data_out)
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print "Opened float data output file: " + options.data_out
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else:
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self.data_out = gr.file_sink(gr.sizeof_gr_complex, options.data_out)
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print "Opened complex data output file: " + options.data_out
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else:
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self.data_out = None
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self.num_inputs = 1
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input_rate = self.sample_rate
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#title='IF',
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#size=(1024,800),
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if (options.data_file is not None) and (options.base_band == False):
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self.scope = scopesink2.scope_sink_c(panel,
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sample_rate=input_rate,
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frame_decim=options.frame_decim,
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v_scale=options.v_scale,
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t_scale=options.t_scale,
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num_inputs=self.num_inputs)
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else:
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self.scope = scopesink2.scope_sink_f(panel,
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sample_rate=input_rate,
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frame_decim=options.frame_decim,
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v_scale=options.v_scale,
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t_scale=options.t_scale,
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num_inputs=self.num_inputs)
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#self.di = gr.deinterleave(gr.sizeof_float)
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#self.di = gr.complex_to_float(1)
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#self.di = gr.complex_to_imag()
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#self.dr = gr.complex_to_real()
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#self.connect(self.src,self.dr)
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#self.connect(self.src,self.di)
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#self.null = gr.null_sink(gr.sizeof_double)
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#self.connect(self.src,self.di)
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#self.connect((self.di,0),(self.scope,0))
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#self.connect((self.di,1),(self.scope,1))
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#self.connect(self.dr,(self.scope,0))
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#self.connect(self.di,(self.scope,1))
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self.msgq = gr.msg_queue(2) # queue that holds a maximum of 2 messages
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self.queue_watcher = queue_watcher(self.msgq, self.adjust_freq_norm)
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#-------------------------------------------------------------------------------
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if options.protocol == 0:
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# ---------- RD-LAP 19.2 kbps (9600 ksps), 25kHz channel,
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print "RD-LAP selected"
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self.symbol_rate = 9600 # symbol rate; at 2 bits/symbol this corresponds to 19.2kbps
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if options.channel_decim is None:
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self.channel_decimation = 10 # decimation (final rate should be at least several symbol rate)
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else:
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self.channel_decimation = options.channel_decim
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self.max_frequency_offset = 12000.0 # coarse carrier tracker leash, ~ half a channel either way
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self.symbol_deviation = 1200.0 # this is frequency offset from center of channel to +1 / -1 symbols
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self.input_sample_rate = self.sample_rate
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self.protocol_processing = fsk4.rdlap_f(self.msgq, 0) # desired protocol processing block selected here
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self.channel_rate = self.input_sample_rate / self.channel_decimation
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# channel selection filter characteristics
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channel_taps = optfir.low_pass(1.0, # Filter gain
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self.input_sample_rate, # Sample rate
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10000, # One-sided modulation bandwidth
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12000, # One-sided channel bandwidth
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0.1, # Passband ripple
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60) # Stopband attenuation
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# symbol shaping filter characteristics
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symbol_coeffs = gr.firdes.root_raised_cosine (1.0, # gain
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self.channel_rate , # sampling rate
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self.symbol_rate, # symbol rate
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0.2, # alpha
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500) # taps
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if options.protocol == 1:
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# ---------- APCO-25 C4FM Test Data
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print "APCO selected"
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self.symbol_rate = 4800 # symbol rate
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if options.channel_decim is None:
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self.channel_decimation = 20 # decimation
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else:
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self.channel_decimation = options.channel_decim
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self.max_frequency_offset = 6000.0 # coarse carrier tracker leash
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self.symbol_deviation = 600.0 # this is frequency offset from center of channel to +1 / -1 symbols
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self.input_sample_rate = self.sample_rate
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self.protocol_processing = fsk4.apco25_f(self.msgq, 0)
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self.channel_rate = self.input_sample_rate / self.channel_decimation
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# channel selection filter
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if (options.data_file is not None) and (options.base_band == False):
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channel_taps = optfir.low_pass(1.0, # Filter gain
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self.input_sample_rate, # Sample rate
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5000, # One-sided modulation bandwidth
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6500, # One-sided channel bandwidth
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0.2, # Passband ripple (was 0.1)
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60) # Stopband attenuation
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else:
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channel_taps = None
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# symbol shaping filter
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symbol_coeffs = gr.firdes.root_raised_cosine (1.0, # gain
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self.channel_rate, # sampling rate
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self.symbol_rate, # symbol rate
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0.2, # alpha
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500) # taps
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# ----------------- End of setup block
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print "Input rate = " + str(self.input_sample_rate)
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print "Channel decimation = " + str(self.channel_decimation)
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print "Channel rate = " + str(self.channel_rate)
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if channel_taps is not None:
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self.chan = gr.freq_xlating_fir_filter_ccf(self.channel_decimation, # Decimation rate
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channel_taps, # Filter taps
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0.0, # Offset frequency
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self.input_sample_rate) # Sample rate
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if (options.freq_translation != 0):
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print "Channel center frequency = " + str(options.freq_translation)
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self.chan.set_center_freq(options.freq_translation)
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else:
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self.chan = None
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if options.carrier_freq is not None:
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print "Carrier frequency = " + str(options.carrier_freq)
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self.sig_carrier = gr.sig_source_c(self.channel_rate, gr.GR_COS_WAVE, options.carrier_freq, 1, 0)
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self.carrier_mul = gr.multiply_vcc(1) # cc(gr.sizeof_gr_complex)
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self.connect(self.sig_carrier, (self.carrier_mul, 0))
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self.connect(self.chan, (self.carrier_mul, 1))
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self.sig_i_carrier = gr.sig_source_f(self.channel_rate, gr.GR_COS_WAVE, options.carrier_freq, 1, 0)
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self.sig_q_carrier = gr.sig_source_f(self.channel_rate, gr.GR_COS_WAVE, options.carrier_freq, 1, (pi / 2.0))
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self.carrier_i_mul = gr.multiply_ff(1)
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self.carrier_q_mul = gr.multiply_ff(1)
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self.iq_to_float = gr.complex_to_float(1)
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self.carrier_iq_add = gr.add_ff(1)
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self.connect(self.carrier_mul, self.iq_to_float)
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self.connect((self.iq_to_float, 0), (self.carrier_i_mul, 0))
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self.connect((self.iq_to_float, 1), (self.carrier_q_mul, 0))
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self.connect(self.sig_i_carrier, (self.carrier_i_mul, 1))
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self.connect(self.sig_q_carrier, (self.carrier_q_mul, 1))
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self.connect(self.carrier_i_mul, (self.carrier_iq_add, 0))
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self.connect(self.carrier_q_mul, (self.carrier_iq_add, 1))
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else:
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self.sig_carrier = None
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self.carrier_mul = None
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#lf_channel_taps = optfir.low_pass(1.0, # Filter gain
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# self.input_sample_rate, # Sample rate
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# 2500, # One-sided modulation bandwidth
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# 3250, # One-sided channel bandwidth
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# 0.1, # Passband ripple (0.1)
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# 60, # Stopband attenuation
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# 9) # Extra taps (default 2, which doesn't work at 48kHz)
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#self.lf = gr.fir_filter_fff(self.channel_decimation, lf_channel_taps)
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self.scope2 = scopesink2.scope_sink_f(panel, sample_rate=self.symbol_rate,
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frame_decim=1,
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v_scale=2,
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t_scale=0.025,
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num_inputs=self.num_inputs)
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# also note: this specifies the nominal frequency deviation for the 4-level fsk signal
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self.fm_demod_gain = self.channel_rate / (2.0 * pi * self.symbol_deviation)
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self.fm_demod = gr.quadrature_demod_cf(self.fm_demod_gain)
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symbol_decim = 1
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self.symbol_filter = gr.fir_filter_fff(symbol_decim, symbol_coeffs)
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# eventually specify: sample rate, symbol rate
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self.demod_fsk4 = fsk4.demod_ff(self.msgq, self.channel_rate, self.symbol_rate)
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if (self.chan is not None):
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self.connect(self.src, self.chan, self.fm_demod, self.symbol_filter, self.demod_fsk4, self.protocol_processing)
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if options.wav_out is not None:
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print "WAV output gain = " + str(options.wav_out_gain)
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self.scaled_wav_data = gr.multiply_const_ff(float(options.wav_out_gain))
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self.connect(self.scaled_wav_data, self.wav_out)
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if self.carrier_mul is None:
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self.connect(self.fm_demod, self.scaled_wav_data)
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else:
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self.connect(self.carrier_iq_add, self.scaled_wav_data)
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if self.data_out is not None:
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if self.carrier_mul is None:
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self.connect(self.fm_demod, self.data_out)
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else:
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self.connect(self.carrier_mul, self.data_out)
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# During signal, -4..4
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#self.connect(self.fm_demod, self.scope2)
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else:
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self.connect(self.src, self.symbol_filter, self.demod_fsk4, self.protocol_processing)
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self.connect(self.src, self.scope)
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#self.connect(self.lf, self.scope)
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self.connect(self.demod_fsk4, self.scope2)
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#self.connect(self.symbol_filter, self.scope2)
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# --------------- End of most of the 4L-FSK hack & slash
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self._build_gui(vbox)
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# set initial values
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if options.gain is None:
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options.gain = 0
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self.set_gain(options.gain)
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def adjust_freq_norm(self, frequency_offset):
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self.offset -= frequency_offset * self.symbol_deviation
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if self.offset > self.max_frequency_offset:
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self.offset = self.max_frequency_offset
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if self.offset < -self.max_frequency_offset:
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self.offset = -self.max_frequency_offset
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print "Channel frequency offset message processed, now at (Hz):", int(self.offset)
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if (self.chan is not None):
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self.chan.set_center_freq(self.offset)
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def _set_status_msg(self, msg):
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self.frame.GetStatusBar().SetStatusText(msg, 0)
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def _build_gui(self, vbox):
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vbox.Add(self.scope.win, 10, wx.EXPAND)
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vbox.Add(self.scope2.win, 10, wx.EXPAND)
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# add control area at the bottom
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self.myform = myform = form.form()
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hbox = wx.BoxSizer(wx.HORIZONTAL)
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hbox.Add((5,0), 0, 0)
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g = [0,1000] # Faux gain range
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myform['gain'] = form.slider_field(parent=self.panel, sizer=hbox, label="Gain",
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weight=3,
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min=int(g[0]), max=int(g[1]),
|
||||
callback=self.gui_set_gain)
|
||||
self.myform['gain'].set_value(int(self.options.gain * 10.0))
|
||||
|
||||
def gui_set_gain(self, gain):
|
||||
self.set_gain(float(gain) / 10.0)
|
||||
|
||||
def set_gain(self, gain):
|
||||
#self.myform['gain'].set_value(int(gain * 10.0)) # update displayed value
|
||||
#self.subdev.set_gain(gain)
|
||||
print "Gain now = " + str(gain)
|
||||
self.src.set_k(gain)
|
||||
|
||||
|
||||
#-----------------------------------------------------------------------
|
||||
# Queue watcher. Dispatches measured delay to callback.
|
||||
#-----------------------------------------------------------------------
|
||||
class queue_watcher (threading.Thread):
|
||||
def __init__ (self, msgq, callback, **kwds):
|
||||
threading.Thread.__init__ (self, **kwds)
|
||||
self.setDaemon (1)
|
||||
self.msgq = msgq
|
||||
self.callback = callback
|
||||
self.keep_running = True
|
||||
self.start ()
|
||||
|
||||
def run (self):
|
||||
while (self.keep_running):
|
||||
msg = self.msgq.delete_head() # blocking read of message queue
|
||||
frequency_correction = msg.arg1()
|
||||
self.callback(frequency_correction)
|
||||
|
||||
|
||||
def main ():
|
||||
app = stdgui2.stdapp( app_top_block, "PCM O'scope + 4LFSK", nstatus=1 )
|
||||
wav_out = app.TopWindow.top_block().wav_out
|
||||
app.MainLoop()
|
||||
if wav_out is not None:
|
||||
wav_out.close()
|
||||
|
||||
if __name__ == '__main__':
|
||||
main ()
|
||||
Reference in New Issue