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op25-legacy/python/fsk4_recv_file.py

66 lines
2.6 KiB

#!/usr/bin/env python
import sys
import math
from gnuradio import gr, gru, audio, eng_notation, blks2, optfir, repeater
from gnuradio.eng_option import eng_option
from optparse import OptionParser
# import cqpsk
from math import pi
class my_top_block(gr.top_block):
def __init__(self):
gr.top_block.__init__(self)
parser = OptionParser(option_class=eng_option)
parser.add_option("-i", "--input-file", type="string", default="in.dat", help="specify the input file")
parser.add_option("-g", "--gain", type="eng_float", default=1.0)
parser.add_option("-L", "--low-pass", type="eng_float", default=15e3, help="low pass cut-off", metavar="Hz")
parser.add_option("-o", "--output-file", type="string", default="out.dat", help="specify the output file")
parser.add_option("-s", "--sample-rate", type="int", default=48000, help="input sample 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
sps = 10
symbol_rate = 4800
# output rate will be 48,000
ntaps = 11 * sps
channel_taps = gr.firdes.low_pass(1.0, sample_rate, options.low_pass, options.low_pass * 0.1, gr.firdes.WIN_HANN)
IN = gr.file_source(gr.sizeof_short, options.input_file)
OUT = gr.file_sink(gr.sizeof_char, options.output_file)
CVT = gr.short_to_float()
AMP = gr.multiply_const_ff(options.gain / 32767.0)
symbol_decim = 1
symbol_coeffs = gr.firdes.root_raised_cosine (1.0, # gain
sample_rate , # sampling rate
symbol_rate, # symbol rate
0.20, # width of trans. band
500) # filter type
SYMBOL_FILTER = gr.fir_filter_fff (symbol_decim, symbol_coeffs)
self.msgq = gr.msg_queue(2)
FSK4 = op25.fsk4_demod_ff(self.msgq, sample_rate, symbol_rate)
levels = [ -2.0, 0.0, 2.0, 4.0 ]
SLICER = repeater.fsk4_slicer_fb(levels)
hostname = "127.0.0.1"
port = 23456
debug = 255
do_imbe = False
do_output = True
do_msgq = False
msgqd = gr.msg_queue(2)
DECODER = repeater.p25_frame_assembler(hostname, port, debug, do_imbe, do_output, do_msgq, msgqd)
self.connect(IN, CVT, AMP, SYMBOL_FILTER, FSK4, SLICER, DECODER, OUT)
if __name__ == "__main__":
try:
my_top_block().run()
except KeyboardInterrupt:
tb.stop()