1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
|
#!/usr/bin/env python
#
# Copyright 2004,2005,2006 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., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#
from gnuradio import gr
from gnuradio import audio
from gnuradio.eng_option import eng_option
from optparse import OptionParser
# Top-level block creating a dial tone
# Derives from new class gr.hier_block2
class dial_tone(gr.hier_block2):
def __init__(self,
sample_rate, # Audio output sample rate (int)
audio_output, # Audio output device
amplitude): # Output volume (0.0-1.0)
# Call hierarchical block constructor
# Top-level blocks have no inputs or outputs
gr.hier_block2.__init__(self,
"dial_tone", # Block type
gr.io_signature(0,0,0), # Input signature
gr.io_signature(0,0,0)) # Output signature
# Hierarchical blocks have a set of 'components' (which may
# be themselves hierarchical blocks), mapped to names.
# 'define_component' takes a string and either a hierarchical
# block or an instance of a 'leaf node' (gr_block) block
# Give names to two sine wave sources and an audio sink
self.define_component("src0", gr.sig_source_f (sample_rate, gr.GR_SIN_WAVE, 350, amplitude))
self.define_component("src1", gr.sig_source_f (sample_rate, gr.GR_SIN_WAVE, 440, amplitude))
self.define_component("dst", audio.sink(sample_rate, audio_output))
# Wire up outputs to inputs. (TODO: convenience functions)
self.connect("src0", 0, "dst", 0)
self.connect("src1", 0, "dst", 1)
if __name__ == '__main__':
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("-a", "--amplitude", type="eng_float", default=0.1,
help="set output volume to AMPLITUDE (0.1)")
(options, args) = parser.parse_args()
if len(args) != 0:
parser.print_help()
raise SystemExit, 1
# Create an instance of a hierarchical block
top_block = dial_tone(int(options.sample_rate),
options.audio_output,
options.amplitude)
# Create an instance of a runtime, passing it the top block
# to process
runtime = gr.runtime(top_block)
try:
# Run forever
runtime.run()
except KeyboardInterrupt:
# Ctrl-C exits
pass
|
