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#!/usr/bin/env python
#
# Copyright 2004,2006 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 2, 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., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.
#
from gnuradio import gr
from gnuradio import audio
from gnuradio.eng_option import eng_option
from optparse import OptionParser
#import os
#print os.getpid()
#raw_input('Attach gdb and press Enter: ')
class my_graph(gr.flow_graph):
def __init__(self):
gr.flow_graph.__init__(self)
parser = OptionParser(option_class=eng_option)
parser.add_option("-O", "--audio-output", type="string", default="",
help="pcm output device name. E.g., hw:0,0 or /dev/dsp")
parser.add_option("-r", "--sample-rate", type="eng_float", default=48000,
help="set sample rate to RATE (48000)")
parser.add_option ("-m", "--max-channels", type="int", default="16",
help="set maximum channels to use")
parser.add_option("-D", "--dont-block", action="store_false", default=True,
dest="ok_to_block")
(options, args) = parser.parse_args ()
if len(args) != 0:
parser.print_help()
raise SystemExit, 1
sample_rate = int(options.sample_rate)
limit_channels = options.max_channels
ampl = 0.1
# With a tip of the hat to Harry Partch, may he R.I.P.
# See "Genesis of a Music". He was into some very wild tunings...
base = 392
ratios = { 1 : 1.0,
3 : 3.0/2,
5 : 5.0/4,
7 : 7.0/4,
9 : 9.0/8,
11 : 11.0/8 }
# progression = (1, 5, 3, 7)
# progression = (1, 9, 3, 7)
# progression = (3, 7, 9, 11)
# progression = (7, 11, 1, 5)
progression = (7, 11, 1, 5, 9)
dst = audio.sink (sample_rate,
options.audio_output,
options.ok_to_block)
max_chan = dst.input_signature().max_streams()
if (max_chan == -1) or (max_chan > limit_channels):
max_chan = limit_channels
for i in range (max_chan):
quo, rem = divmod (i, len (progression))
freq = base * ratios[progression[rem]] * (quo + 1)
src = gr.sig_source_f (sample_rate, gr.GR_SIN_WAVE, freq, ampl)
self.connect (src, (dst, i))
if __name__ == '__main__':
try:
my_graph().run()
except KeyboardInterrupt:
pass
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