blob: d67890576de262fa3beab14111792917616661b9 (
plain)
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
|
/*---------------------------------------------------------------------------*\
FILE........: freedv_700d_tx.c
AUTHOR......: David Rowe
DATE CREATED: April 2021
Demo transmit program using the FreeDV API (700D mode).
usage:
cd ~/codec2/build_linux
cat ../raw/ve9qrp_10s.raw | ./demo/freedv_700d_tx | ./demo/freedv_700d_rx | aplay -f S16_LE
Listen to the modulated Tx signal:
cat ../raw/ve9qrp_10s.raw | ./demo/freedv_700d_tx | aplay -f S16_LE
\*---------------------------------------------------------------------------*/
/*
Copyright (C) 2021 David Rowe
All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License version 2.1, as
published by the Free Software Foundation. This program 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 Lesser General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "freedv_api.h"
int main(int argc, char *argv[]) {
struct freedv *freedv;
freedv = freedv_open(FREEDV_MODE_700D);
assert(freedv != NULL);
/* handy functions to set buffer sizes */
int n_speech_samples = freedv_get_n_speech_samples(freedv);
short speech_in[n_speech_samples];
int n_nom_modem_samples = freedv_get_n_nom_modem_samples(freedv);
short mod_out[n_nom_modem_samples];
/* OK main loop --------------------------------------- */
while(fread(speech_in, sizeof(short), n_speech_samples, stdin) == n_speech_samples) {
freedv_tx(freedv, mod_out, speech_in);
fwrite(mod_out, sizeof(short), n_nom_modem_samples, stdout);
}
freedv_close(freedv);
return 0;
}
|
