add fs4k_recv_file.py

git-svn-id: http://op25.osmocom.org/svn/trunk@218 65a5c917-d112-43f1-993d-58c26a4786be

python/fsk4_recv_file.py

@@ -0,0 +1,66 @@
+#!/usr/bin/env python
+import sys
+import math
+from gnuradio import gr, gru, audio, eng_notation, blks2, optfir, fsk4, 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 = 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()