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#!/usr/bin/env python
#
# Copyright 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 vocoder
def build_graph():
tb = gr.top_block()
src = audio.source(8000)
src_scale = blocks.multiply_const_ff(32767)
f2s = blocks.float_to_short()
enc = vocoder.g723_40_encode_sb()
dec = vocoder.g723_40_decode_bs()
s2f = blocks.short_to_float()
sink_scale = blocks.multiply_const_ff(1.0 / 32767.)
sink = audio.sink(8000)
tb.connect(src, src_scale, f2s, enc, dec, s2f, sink_scale, sink)
return tb
if __name__ == '__main__':
tb = build_graph()
tb.start()
input ('Press Enter to exit: ')
tb.stop()
tb.wait()
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