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#!/usr/bin/env python
#
# Copyright 2007,2011 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# GNU Radio is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# GNU Radio is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU Radio; see the file COPYING. If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#
from gnuradio import gr, blks2
from gnuradio import audio
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 = gr.multiply_const_ff(scale_factor)
interp = blks2.rational_resampler_fff(8, 1)
f2s = gr.float_to_short ()
enc = vocoder.cvsd_encode_sb()
dec = vocoder.cvsd_decode_bs()
s2f = gr.short_to_float ()
decim = blks2.rational_resampler_fff(1, 8)
sink_scale = gr.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.conect(src, gr.file_sink(gr.sizeof_float, "source.dat"))
tb.conect(src_scale, gr.file_sink(gr.sizeof_float, "src_scale.dat"))
tb.conect(interp, gr.file_sink(gr.sizeof_float, "interp.dat"))
tb.conect(f2s, gr.file_sink(gr.sizeof_short, "f2s.dat"))
tb.conect(enc, gr.file_sink(gr.sizeof_char, "enc.dat"))
tb.conect(dec, gr.file_sink(gr.sizeof_short, "dec.dat"))
tb.conect(s2f, gr.file_sink(gr.sizeof_float, "s2f.dat"))
tb.conect(decim, gr.file_sink(gr.sizeof_float, "decim.dat"))
tb.conect(sink_scale, gr.file_sink(gr.sizeof_float, "sink_scale.dat"))
return tb
if __name__ == '__main__':
tb = build_graph()
tb.start()
raw_input ('Press Enter to exit: ')
tb.stop()
tb.wait()
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