/*---------------------------------------------------------------------------*\
FILE........: freedv_tx.c
AUTHOR......: David Rowe
DATE CREATED: August 2014
Demo transmit program for FreeDV API functions.
\*---------------------------------------------------------------------------*/
/*
Copyright (C) 2014 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 .
*/
#include
#include
#include
#include
#include
#include
#include "freedv_api.h"
#include "reliable_text.h"
struct my_callback_state {
char tx_str[80];
char *ptx_str;
int calls;
};
char my_get_next_tx_char(void *callback_state) {
struct my_callback_state *pstate = (struct my_callback_state *)callback_state;
char c = *pstate->ptx_str++;
if (*pstate->ptx_str == 0) {
pstate->ptx_str = pstate->tx_str;
}
return c;
}
void on_reliable_text_rx(reliable_text_t rt, const char *txt_ptr, int length,
void *state) {
// empty since we don't expect to receive anything in this program.
}
int main(int argc, char *argv[]) {
FILE *fin, *fout;
struct freedv *freedv;
int mode;
int use_testframes, use_clip, use_txbpf, use_reliabletext;
char *callsign = "";
reliable_text_t reliable_text_obj;
char f2020[80] = {0};
#ifdef __LPCNET__
sprintf(f2020, "|2020|2020B");
#endif
if (argc < 4) {
helpmsg:
fprintf(stderr,
"usage: %s [options] 1600|700C|700D|700E|2400A|2400B|800XA%s "
"InputRawSpeechFile OutputModemRawFile\n"
"\n"
" --clip 0|1 Clipping (compression) of modem output "
"samples for reduced PAPR\n"
" and higher average power\n"
" --reliabletext txt Send 'txt' using reliable text protocol\n"
" --testframes Send testframe instead of coded speech. "
"Number of testsframes depends on\n"
" length of speech input file\n"
" --txbpf 0|1 Bandpass filter\n"
"\n",
argv[0], f2020);
fprintf(stderr, "example: $ %s 1600 hts1a.raw hts1a_fdmdv.raw\n", argv[0]);
exit(1);
}
use_testframes = 0;
use_clip = 0;
use_txbpf = 1;
use_reliabletext = 0;
int o = 0;
int opt_idx = 0;
while (o != -1) {
static struct option long_opts[] = {
{"clip", required_argument, 0, 'l'},
{"help", no_argument, 0, 'h'},
{"reliabletext", required_argument, 0, 'r'},
{"testframes", no_argument, 0, 't'},
{"txbpf", required_argument, 0, 'b'},
{0, 0, 0, 0}};
o = getopt_long(argc, argv, "l:dhr:tb:", long_opts, &opt_idx);
switch (o) {
case 'b':
use_txbpf = atoi(optarg);
break;
case 'l':
use_clip = atoi(optarg);
break;
case 'r':
use_reliabletext = 1;
callsign = optarg;
break;
case 't':
use_testframes = 1;
break;
case 'h':
case '?':
goto helpmsg;
break;
}
}
int dx = optind;
if ((argc - dx) < 3) {
fprintf(stderr, "too few arguments.\n");
goto helpmsg;
}
mode = -1;
if (!strcmp(argv[dx], "1600")) mode = FREEDV_MODE_1600;
if (!strcmp(argv[dx], "700C")) mode = FREEDV_MODE_700C;
if (!strcmp(argv[dx], "700D")) mode = FREEDV_MODE_700D;
if (!strcmp(argv[dx], "700E")) mode = FREEDV_MODE_700E;
if (!strcmp(argv[dx], "2400A")) mode = FREEDV_MODE_2400A;
if (!strcmp(argv[dx], "2400B")) mode = FREEDV_MODE_2400B;
if (!strcmp(argv[dx], "800XA")) mode = FREEDV_MODE_800XA;
#ifdef __LPCNET__
if (!strcmp(argv[dx], "2020")) mode = FREEDV_MODE_2020;
if (!strcmp(argv[dx], "2020B")) mode = FREEDV_MODE_2020B;
#endif
if (mode == -1) {
fprintf(stderr, "Error in mode: %s\n", argv[dx]);
exit(1);
}
if (strcmp(argv[dx + 1], "-") == 0)
fin = stdin;
else if ((fin = fopen(argv[dx + 1], "rb")) == NULL) {
fprintf(stderr, "Error opening input raw speech sample file: %s: %s.\n",
argv[dx + 1], strerror(errno));
exit(1);
}
if (strcmp(argv[dx + 2], "-") == 0)
fout = stdout;
else if ((fout = fopen(argv[dx + 2], "wb")) == NULL) {
fprintf(stderr, "Error opening output modem sample file: %s: %s.\n",
argv[dx + 2], strerror(errno));
exit(1);
}
freedv = freedv_open(mode);
assert(freedv != NULL);
/* these are all optional ------------------ */
freedv_set_test_frames(freedv, use_testframes);
freedv_set_clip(freedv, use_clip);
freedv_set_tx_bpf(freedv, use_txbpf);
freedv_set_verbose(freedv, 1);
freedv_set_eq(freedv, true); /* for 700C/D/E & 800XA */
if (use_reliabletext) {
reliable_text_obj = reliable_text_create();
assert(reliable_text_obj != NULL);
reliable_text_set_string(reliable_text_obj, callsign, strlen(callsign));
reliable_text_use_with_freedv(reliable_text_obj, freedv,
on_reliable_text_rx, NULL);
} else {
/* set up callback for txt msg chars */
struct my_callback_state my_cb_state;
sprintf(my_cb_state.tx_str, "cq cq cq hello world\r");
my_cb_state.ptx_str = my_cb_state.tx_str;
my_cb_state.calls = 0;
freedv_set_callback_txt(freedv, NULL, &my_get_next_tx_char, &my_cb_state);
}
/* handy functions to set buffer sizes, note tx/modulator always
returns freedv_get_n_nom_modem_samples() (unlike rx side) */
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, fin) ==
n_speech_samples) {
freedv_tx(freedv, mod_out, speech_in);
fwrite(mod_out, sizeof(short), n_nom_modem_samples, fout);
/* if using pipes we don't want the usual buffering to occur */
if (fout == stdout) fflush(stdout);
}
freedv_close(freedv);
if (use_reliabletext) reliable_text_destroy(reliable_text_obj);
fclose(fin);
fclose(fout);
return 0;
}