3 # Copyright 2004,2005,2006 Free Software Foundation, Inc.
5 # This file is part of GNU Radio
7 # GNU Radio is free software; you can redistribute it and/or modify
8 # it under the terms of the GNU General Public License as published by
9 # the Free Software Foundation; either version 2, or (at your option)
12 # GNU Radio is distributed in the hope that it will be useful,
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 # GNU General Public License for more details.
17 # You should have received a copy of the GNU General Public License
18 # along with GNU Radio; see the file COPYING. If not, write to
19 # the Free Software Foundation, Inc., 51 Franklin Street,
20 # Boston, MA 02110-1301, USA.
23 from gnuradio import gr
24 from gnuradio import audio
25 from gnuradio.eng_option import eng_option
26 from optparse import OptionParser
28 # Top-level block creating a dial tone
29 # Derives from new class gr.hier_block2
30 class dial_tone(gr.hier_block2):
32 sample_rate, # Audio output sample rate (int)
33 audio_output, # Audio output device
34 amplitude): # Output volume (0.0-1.0)
36 # Call hierarchical block constructor
37 # Top-level blocks have no inputs or outputs
38 gr.hier_block2.__init__(self,
39 "dial_tone", # Block type
40 gr.io_signature(0,0,0), # Input signature
41 gr.io_signature(0,0,0)) # Output signature
43 # Hierarchical blocks have a set of 'components' (which may
44 # be themselves hierarchical blocks), mapped to names.
45 # 'define_component' takes a string and either a hierarchical
46 # block or an instance of a 'leaf node' (gr_block) block
48 # Give names to two sine wave sources and an audio sink
49 self.define_component("src0", gr.sig_source_f (sample_rate, gr.GR_SIN_WAVE, 350, amplitude))
50 self.define_component("src1", gr.sig_source_f (sample_rate, gr.GR_SIN_WAVE, 440, amplitude))
51 self.define_component("dst", audio.sink(sample_rate, audio_output))
53 # Wire up outputs to inputs. (TODO: convenience functions)
54 self.connect("src0", 0, "dst", 0)
55 self.connect("src1", 0, "dst", 1)
57 if __name__ == '__main__':
58 parser = OptionParser(option_class=eng_option)
59 parser.add_option("-O", "--audio-output", type="string", default="",
60 help="pcm output device name. E.g., hw:0,0 or /dev/dsp")
61 parser.add_option("-r", "--sample-rate", type="eng_float", default=48000,
62 help="set sample rate to RATE (48000)")
63 parser.add_option("-a", "--amplitude", type="eng_float", default=0.1,
64 help="set output volume to AMPLITUDE (0.1)")
65 (options, args) = parser.parse_args()
70 # Create an instance of a hierarchical block
71 top_block = dial_tone(int(options.sample_rate),
75 # Create an instance of a runtime, passing it the top block
77 runtime = gr.runtime(top_block)
82 except KeyboardInterrupt: