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
|
/* -*- c++ -*- */
/*
* Copyright 2016 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 "freedv_tx_ss_impl.h"
#include <gnuradio/io_signature.h>
#include <stdexcept>
#include <iostream>
#include <iomanip>
extern "C" {
char
get_next_tx_char(void *callback_state)
{
char c;
struct freedv_tx_callback_state* pstate;
pstate = (struct freedv_tx_callback_state*)callback_state;
c = *pstate->ptx_str++;
if (*pstate->ptx_str == 0) {
pstate->ptx_str = pstate->tx_str;
c = 0x0d; // FreeDV uses Carriage Return termination
}
return c;
}
}
namespace gr {
namespace vocoder {
freedv_tx_ss::sptr
freedv_tx_ss::make(int mode, const std::string msg_txt)
{
return gnuradio::get_initial_sptr
(new freedv_tx_ss_impl(mode, msg_txt));
}
freedv_tx_ss_impl::freedv_tx_ss_impl(int mode, const std::string msg_txt)
: sync_block("vocoder_freedv_tx_ss",
io_signature::make(1, 1, sizeof(short)),
io_signature::make(1, 1, sizeof(short))),
d_mode(mode), d_msg_text(msg_txt)
{
if((d_freedv = freedv_open(mode)) == NULL)
throw std::runtime_error("freedv_tx_ss_impl: freedv_open failed");
snprintf(d_cb_state.tx_str,79,"%s",d_msg_text.c_str());
d_cb_state.ptx_str = d_cb_state.tx_str;
freedv_set_callback_txt(d_freedv, NULL, get_next_tx_char, (void *) &d_cb_state);
d_nom_modem_samples = freedv_get_n_nom_modem_samples(d_freedv);
set_output_multiple(d_nom_modem_samples);
}
freedv_tx_ss_impl::~freedv_tx_ss_impl()
{
freedv_close(d_freedv);
}
int
freedv_tx_ss_impl::work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
short *in = (short*)input_items[0];
short *out = (short*)output_items[0];
int i;
for(i=0;i<(noutput_items/d_nom_modem_samples);i++)
freedv_tx(d_freedv, &(out[i*d_nom_modem_samples]), &(in[i*d_nom_modem_samples]));
return noutput_items;
}
} /* namespace vocoder */
} /* namespace gr */
|
