113 lines
3.3 KiB
C
113 lines
3.3 KiB
C
/*---------------------------------------------------------------------------*\
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FILE........: fdmdv_put_test_bits.c
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AUTHOR......: David Rowe
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DATE CREATED: 1 May 2012
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Using a file of packed test bits as input, determines bit error
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rate. Useful for testing fdmdv_demod.
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\*---------------------------------------------------------------------------*/
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/*
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Copyright (C) 2012 David Rowe
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All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License version 2, as
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published by the Free Software Foundation. This program is
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distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#include <errno.h>
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#include "fdmdv.h"
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#define BITS_PER_CODEC_FRAME (2*FDMDV_BITS_PER_FRAME)
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#define BYTES_PER_CODEC_FRAME (BITS_PER_CODEC_FRAME/8)
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int main(int argc, char *argv[])
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{
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FILE *fin;
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struct FDMDV *fdmdv;
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char packed_bits[BYTES_PER_CODEC_FRAME];
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int rx_bits[2*FDMDV_BITS_PER_FRAME];
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int i, bit, byte;
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int test_frame_sync, bit_errors, total_bit_errors, total_bits, ntest_bits;
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if (argc < 2) {
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printf("usage: %s InputBitFile\n", argv[0]);
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printf("e.g %s test.c2\n", argv[0]);
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exit(1);
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}
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if (strcmp(argv[1], "-") == 0) fin = stdin;
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else if ( (fin = fopen(argv[1],"rb")) == NULL ) {
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fprintf(stderr, "Error opening input bit file: %s: %s.\n",
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argv[1], strerror(errno));
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exit(1);
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}
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fdmdv = fdmdv_create();
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total_bit_errors = 0;
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total_bits = 0;
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while(fread(packed_bits, sizeof(char), BYTES_PER_CODEC_FRAME, fin) == BYTES_PER_CODEC_FRAME) {
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/* unpack bits, MSB first */
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bit = 7; byte = 0;
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for(i=0; i<BITS_PER_CODEC_FRAME; i++) {
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rx_bits[i] = (packed_bits[byte] >> bit) & 0x1;
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//printf("%d 0x%x %d\n", i, packed_bits[byte], rx_bits[i]);
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bit--;
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if (bit < 0) {
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bit = 7;
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byte++;
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}
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}
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assert(byte == BYTES_PER_CODEC_FRAME);
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fdmdv_put_test_bits(fdmdv, &test_frame_sync, &bit_errors, &ntest_bits, rx_bits);
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if (test_frame_sync == 1) {
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total_bit_errors += bit_errors;
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total_bits = total_bits + ntest_bits;
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printf("+");
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}
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else
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printf("-");
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fdmdv_put_test_bits(fdmdv, &test_frame_sync, &bit_errors, &ntest_bits, &rx_bits[FDMDV_BITS_PER_FRAME]);
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if (test_frame_sync == 1) {
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total_bit_errors += bit_errors;
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total_bits = total_bits + ntest_bits;
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printf("+");
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}
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else
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printf("-");
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/* if this is in a pipeline, we probably don't want the usual
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buffering to occur */
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if (fin == stdin) fflush(stdin);
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}
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fclose(fin);
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fdmdv_destroy(fdmdv);
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printf("\nbits %d errors %d BER %1.4f\n", total_bits, total_bit_errors, (float)total_bit_errors/(1E-6+total_bits) );
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return 0;
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}
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