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/*
FILE...: ldpc_enc.c
AUTHOR.: Bill Cowley, David Rowe
CREATED: Sep 2016
RA LDPC encoder program. Using the elegant back substitution of RA
LDPC codes.
building: gcc ldpc_enc.c -o ldpc_enc -Wall -g
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include "mpdecode_core_test.h"
#include "ofdm_internal.h"
/* generated by ldpc_fsk_lib.m:ldpc_decode() */
#include "H2064_516_sparse_test.h"
#include "HRA_112_112_test.h"
int opt_exists(char *argv[], int argc, char opt[]) {
int i;
for (i=0; i<argc; i++) {
if (strcmp(argv[i], opt) == 0) {
return i;
}
}
return 0;
}
int main(int argc, char *argv[])
{
unsigned char ibits[NUMBERROWSHCOLS];
unsigned char pbits[NUMBERPARITYBITS];
FILE *fin, *fout;
int arg, sd, i, frames, codename, testframes, Nframes, data_bits_per_frame;
double sdout[NUMBERROWSHCOLS+NUMBERPARITYBITS];
struct LDPC ldpc;
if (argc < 2) {
fprintf(stderr, "\n");
fprintf(stderr, "usage: %s InputOneBytePerBit OutputFile [--sd] [--code CodeName] [--testframes Nframes]\n", argv[0]);
fprintf(stderr, "\n");
fprintf(stderr, "usage: %s --listcodes\n\n", argv[0]);
fprintf(stderr, " List supported codes (more can be added via using Octave ldpc scripts)\n");
fprintf(stderr, "\n");
exit(0);
}
/* todo: put this in a function file to share with ldpc_dec.c */
if ((codename = opt_exists(argv, argc, "--listcodes")) != 0) {
fprintf(stderr,"\n");
fprintf(stderr,"H2064_516_sparse\n");
fprintf(stderr,"HRA_112_112\n");
fprintf(stderr,"\n");
exit(0);
}
/* set up LDPC code from include file constants */
if ((codename = opt_exists(argv, argc, "--code")) != 0) {
/* short rate 1/2 code for FreeDV HF digital voice */
if (strcmp(argv[codename+1], "HRA_112_112") == 0) {
fprintf(stderr, "code: %s\n", argv[codename+1]);
ldpc.CodeLength = HRA_112_112_CODELENGTH;
ldpc.NumberParityBits = HRA_112_112_NUMBERPARITYBITS;
ldpc.NumberRowsHcols = HRA_112_112_NUMBERROWSHCOLS;
ldpc.max_row_weight = HRA_112_112_MAX_ROW_WEIGHT;
ldpc.max_col_weight = HRA_112_112_MAX_COL_WEIGHT;
ldpc.H_rows = HRA_112_112_H_rows;
ldpc.H_cols = HRA_112_112_H_cols;
}
} else {
/* default Wenet High Alitiude Balloon rate 0.8 code */
ldpc.CodeLength = CODELENGTH;
ldpc.NumberParityBits = NUMBERPARITYBITS;
ldpc.NumberRowsHcols = NUMBERROWSHCOLS;
ldpc.max_row_weight = MAX_ROW_WEIGHT;
ldpc.max_col_weight = MAX_COL_WEIGHT;
ldpc.H_rows = H_rows;
ldpc.H_cols = H_cols;
}
data_bits_per_frame = ldpc.NumberRowsHcols;
if (strcmp(argv[1], "-") == 0) fin = stdin;
else if ( (fin = fopen(argv[1],"rb")) == NULL ) {
fprintf(stderr, "Error opening input bit file: %s: %s.\n",
argv[1], strerror(errno));
exit(1);
}
if (strcmp(argv[2], "-") == 0) fout = stdout;
else if ( (fout = fopen(argv[2],"wb")) == NULL ) {
fprintf(stderr, "Error opening output bit file: %s: %s.\n",
argv[2], strerror(errno));
exit(1);
}
sd = 0;
if (opt_exists(argv, argc, "--sd")) {
sd = 1;
}
testframes = Nframes = 0;
if ((arg = (opt_exists(argv, argc, "--testframes")))) {
testframes = 1;
Nframes = atoi(argv[arg+1]);
fprintf(stderr, "Nframes: %d\n", Nframes);
}
frames = 0;
while (fread(ibits, sizeof(char), data_bits_per_frame, fin) == data_bits_per_frame) {
if (testframes) {
uint16_t r[data_bits_per_frame];
ofdm_rand(r, data_bits_per_frame);
for(i=0; i<data_bits_per_frame; i++) {
ibits[i] = r[i] > 16384;
}
}
encode(&ldpc, ibits, pbits);
if (sd) {
/* map to BPSK symbols */
for (i=0; i<data_bits_per_frame; i++)
sdout[i] = 1.0 - 2.0 * ibits[i];
for (i=0; i<ldpc.NumberParityBits; i++)
sdout[i+data_bits_per_frame] = 1.0 - 2.0 * pbits[i];
fwrite(sdout, sizeof(double), data_bits_per_frame+ldpc.NumberParityBits, fout);
}
else {
fwrite(ibits, sizeof(char), data_bits_per_frame, fout);
fwrite(pbits, sizeof(char), ldpc.NumberParityBits, fout);
}
frames++;
if (testframes && (frames >= Nframes)) {
goto finished;
}
}
finished:
fclose(fin);
fclose(fout);
return 1;
}
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