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op25-legacy/python/audio_imbe.py

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3.6 KiB

#!/usr/bin/env python
import sys
import math
from gnuradio import gr, gru, audio, eng_notation, blks2, optfir, op25, repeater
from gnuradio.eng_option import eng_option
from optparse import OptionParser
class my_top_block(gr.top_block):
def __init__(self):
gr.top_block.__init__(self)
parser = OptionParser(option_class=eng_option)
parser.add_option("-a", "--audio-input", type="string", default="")
parser.add_option("-A", "--audio-output", type="string", default="")
parser.add_option("-f", "--factor", type="eng_float", default=1)
parser.add_option("-i", "--do-interp", action="store_true", default=False, help="enable output interpolator")
parser.add_option("-s", "--sample-rate", type="int", default=48000, help="input sample rate")
parser.add_option("-S", "--stretch", type="int", default=0, help="flex amt")
parser.add_option("-y", "--symbol-rate", type="int", default=4800, help="input symbol rate")
parser.add_option("-v", "--verbose", action="store_true", default=False, help="dump demodulation data")
(options, args) = parser.parse_args()
sample_rate = options.sample_rate
symbol_rate = options.symbol_rate
IN = audio.source(sample_rate, options.audio_input)
audio_output_rate = 8000
if options.do_interp:
audio_output_rate = 48000
OUT = audio.sink(audio_output_rate, options.audio_output)
symbol_decim = 1
symbol_coeffs = gr.firdes.root_raised_cosine(1.0, # gain
sample_rate , # sampling rate
symbol_rate, # symbol rate
0.2, # width of trans. band
500) # filter type
SYMBOL_FILTER = gr.fir_filter_fff (symbol_decim, symbol_coeffs)
AMP = gr.multiply_const_ff(options.factor)
msgq = gr.msg_queue(2)
FSK4 = op25.fsk4_demod_ff(msgq, sample_rate, symbol_rate)
levels = levels = [-2.0, 0.0, 2.0, 4.0]
SLICER = repeater.fsk4_slicer_fb(levels)
framer_msgq = gr.msg_queue(2)
DECODE = repeater.p25_frame_assembler('', # udp hostname
0, # udp port no.
options.verbose, #debug
True, # do_imbe
True, # do_output
False, # do_msgq
framer_msgq)
IMBE = repeater.vocoder(False, # 0=Decode,True=Encode
options.verbose, # Verbose flag
options.stretch, # flex amount
"", # udp ip address
0, # udp port
False) # dump raw u vectors
CVT = gr.short_to_float()
if options.do_interp:
interp_taps = gr.firdes.low_pass(1.0, 48000, 4000, 4000 * 0.1, gr.firdes.WIN_HANN)
INTERP = gr.interp_fir_filter_fff(48000 // 8000, interp_taps)
AMP2 = gr.multiply_const_ff(1.0 / 32767.0)
self.connect(IN, AMP, SYMBOL_FILTER, FSK4, SLICER, DECODE, IMBE, CVT, AMP2)
if options.do_interp:
self.connect(AMP2, INTERP, OUT)
else:
self.connect(AMP2, OUT)
if __name__ == "__main__":
try:
my_top_block().run()
except KeyboardInterrupt:
tb.stop()