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/*---------------------------------------------------------------------------*\
FILE........: fdmdv_get_test_bits.c
AUTHOR......: David Rowe
DATE CREATED: 1 May 2012
Generates a file of packed test bits, useful for input to fdmdv_mod.
\*---------------------------------------------------------------------------*/
/*
Copyright (C) 2012 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 <errno.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "codec2_fdmdv.h"
int main(int argc, char *argv[]) {
FILE *fout;
struct FDMDV *fdmdv;
char *packed_bits;
int *tx_bits;
int n, i, bit, byte;
int numBits, nCodecFrames;
int bits_per_fdmdv_frame;
int bits_per_codec_frame;
int bytes_per_codec_frame;
int Nc;
if (argc < 3) {
printf("usage: %s OutputBitFile numBits [Nc]\n", argv[0]);
printf("e.g %s test.c2 1400\n", argv[0]);
exit(1);
}
if (strcmp(argv[1], "-") == 0)
fout = stdout;
else if ((fout = fopen(argv[1], "wb")) == NULL) {
fprintf(stderr, "Error opening output bit file: %s: %s.\n", argv[1],
strerror(errno));
exit(1);
}
numBits = atoi(argv[2]);
if (argc == 4) {
Nc = atoi(argv[3]);
if ((Nc < 2) || (Nc > FDMDV_NC_MAX)) {
fprintf(stderr, "Error number of carriers must be btween 2 and %d\n",
FDMDV_NC_MAX);
exit(1);
}
} else
Nc = FDMDV_NC;
fdmdv = fdmdv_create(Nc);
bits_per_fdmdv_frame = fdmdv_bits_per_frame(fdmdv);
bits_per_codec_frame = 2 * fdmdv_bits_per_frame(fdmdv);
bytes_per_codec_frame = (bits_per_codec_frame + 7) / 8;
fprintf(stderr,
"bits_per_fdmdv_frame: %d bits_per_codec_frame: %d "
"bytes_per_codec_frame: %d\n",
bits_per_fdmdv_frame, bits_per_codec_frame, bytes_per_codec_frame);
packed_bits = (char *)malloc(bytes_per_codec_frame);
assert(packed_bits != NULL);
tx_bits = (int *)malloc(sizeof(int) * bits_per_codec_frame);
assert(tx_bits != NULL);
nCodecFrames = numBits / bits_per_codec_frame;
for (n = 0; n < nCodecFrames; n++) {
fdmdv_get_test_bits(fdmdv, tx_bits);
fdmdv_get_test_bits(fdmdv, &tx_bits[bits_per_fdmdv_frame]);
/* pack bits, MSB received first */
bit = 7;
byte = 0;
memset(packed_bits, 0, bytes_per_codec_frame);
for (i = 0; i < bits_per_codec_frame; i++) {
packed_bits[byte] |= (tx_bits[i] << bit);
bit--;
if (bit < 0) {
bit = 7;
byte++;
}
}
fwrite(packed_bits, sizeof(char), bytes_per_codec_frame, fout);
/* if this is in a pipeline, we probably don't want the usual
buffering to occur */
if (fout == stdout) fflush(stdout);
}
free(tx_bits);
free(packed_bits);
fclose(fout);
fdmdv_destroy(fdmdv);
return 0;
}
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