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#!/usr/bin/env python
#
# Copyright 2007,2011 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# SPDX-License-Identifier: GPL-3.0-or-later
#
#
from gnuradio import gr
from gnuradio import audio
from gnuradio import blocks
from gnuradio import filter
from gnuradio import vocoder
def build_graph():
sample_rate = 8000
scale_factor = 32000
tb = gr.top_block()
src = audio.source(sample_rate, "plughw:0,0")
src_scale = blocks.multiply_const_ff(scale_factor)
interp = filter.rational_resampler_fff(8, 1)
f2s = blocks.float_to_short()
enc = vocoder.cvsd_encode_sb()
dec = vocoder.cvsd_decode_bs()
s2f = blocks.short_to_float()
decim = filter.rational_resampler_fff(1, 8)
sink_scale = blocks.multiply_const_ff(1.0 / scale_factor)
sink = audio.sink(sample_rate, "plughw:0,0")
tb.connect(src, src_scale, interp, f2s, enc)
tb.connect(enc, dec, s2f, decim, sink_scale, sink)
if 0: # debug
tb.connect(src, blocks.file_sink(gr.sizeof_float, "source.dat"))
tb.connect(src_scale, blocks.file_sink(
gr.sizeof_float, "src_scale.dat"))
tb.connect(interp, blocks.file_sink(gr.sizeof_float, "interp.dat"))
tb.connect(f2s, blocks.file_sink(gr.sizeof_short, "f2s.dat"))
tb.connect(enc, blocks.file_sink(gr.sizeof_char, "enc.dat"))
tb.connect(dec, blocks.file_sink(gr.sizeof_short, "dec.dat"))
tb.connect(s2f, blocks.file_sink(gr.sizeof_float, "s2f.dat"))
tb.connect(decim, blocks.file_sink(gr.sizeof_float, "decim.dat"))
tb.connect(sink_scale, blocks.file_sink(
gr.sizeof_float, "sink_scale.dat"))
return tb
if __name__ == '__main__':
tb = build_graph()
tb.start()
input('Press Enter to exit: ')
tb.stop()
tb.wait()
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