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
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
/* -*- c++ -*- */
/*
* Copyright 2004,2006,2012 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "squelch_base_ff_impl.h"
#include <gr_io_signature.h>
namespace gr {
namespace analog {
squelch_base_ff_impl::squelch_base_ff_impl(const char *name, int ramp, bool gate)
: gr_block(name,
gr_make_io_signature(1, 1, sizeof(float)),
gr_make_io_signature(1, 1, sizeof(float)))
{
set_ramp(ramp);
set_gate(gate);
d_state = ST_MUTED;
d_envelope = d_ramp ? 0.0 : 1.0;
d_ramped = 0;
}
squelch_base_ff_impl::~squelch_base_ff_impl()
{
}
int
squelch_base_ff_impl::ramp() const
{
return d_ramp;
}
void
squelch_base_ff_impl::set_ramp(int ramp)
{
d_ramp = ramp;
}
bool
squelch_base_ff_impl::gate() const
{
return d_gate;
}
void
squelch_base_ff_impl::set_gate(bool gate)
{
d_gate = gate;
}
bool
squelch_base_ff_impl::unmuted() const
{
return (d_state == ST_UNMUTED || d_state == ST_ATTACK);
}
int
squelch_base_ff_impl::general_work(int noutput_items,
gr_vector_int &ninput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
const float *in = (const float *) input_items[0];
float *out = (float *) output_items[0];
int j = 0;
for(int i = 0; i < noutput_items; i++) {
update_state(in[i]);
// Adjust envelope based on current state
switch(d_state) {
case ST_MUTED:
if(!mute())
// If not ramping, go straight to unmuted
d_state = d_ramp ? ST_ATTACK : ST_UNMUTED;
break;
case ST_UNMUTED:
if(mute())
// If not ramping, go straight to muted
d_state = d_ramp ? ST_DECAY : ST_MUTED;
break;
case ST_ATTACK:
// FIXME: precalculate window for speed
d_envelope = 0.5-std::cos(M_PI*(++d_ramped)/d_ramp)/2.0;
// use >= in case d_ramp is set to lower value elsewhere
if(d_ramped >= d_ramp) {
d_state = ST_UNMUTED;
d_envelope = 1.0;
}
break;
case ST_DECAY:
// FIXME: precalculate window for speed
d_envelope = 0.5-std::cos(M_PI*(--d_ramped)/d_ramp)/2.0;
if(d_ramped == 0.0)
d_state = ST_MUTED;
break;
};
// If unmuted, copy input times envelope to output
// Otherwise, if not gating, copy zero to output
if(d_state != ST_MUTED)
out[j++] = in[i]*d_envelope;
else
if(!d_gate)
out[j++] = 0.0;
}
consume_each(noutput_items); // Use all the inputs
return j; // But only report outputs copied
}
} /* namespace analog */
} /* namespace gr */
|
