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ttf.c
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ttf.c
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/*
* Copyright (c) 2009,2022 Nathaniel Houghton <nathan@brainwerk.org>
*
* Permission to use, copy, modify, and distribute this software for
* any purpose with or without fee is hereby granted, provided that
* the above copyright notice and this permission notice appear in all
* copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
* WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
* AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA
* OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#include <ctype.h>
#include <math.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#define AMP 1000
#define NUM_ROW 9
#define NUM_COL 5
struct options {
double duration;
double low_freq;
double high_freq;
double freq_gap;
double char_gap;
double f_s;
};
void output_char(struct options *, char);
void output_gap(struct options *opt);
void usage(const char *progname);
static uint8_t char_map[][NUM_ROW][NUM_COL] = {
{
{ 0, 1, 1, 1, 0 },
{ 1, 1, 0, 1, 1 },
{ 1, 1, 0, 1, 1 },
{ 1, 1, 1, 1, 1 },
{ 1, 1, 0, 1, 1 },
{ 1, 1, 0, 1, 1 },
{ 1, 1, 0, 1, 1 },
{ 1, 1, 0, 1, 1 }
},
{
{ 1, 1, 1, 1, 0 },
{ 1, 1, 0, 1, 1 },
{ 1, 1, 0, 1, 1 },
{ 1, 1, 1, 1, 0 },
{ 1, 1, 1, 1, 0 },
{ 1, 1, 0, 1, 1 },
{ 1, 1, 0, 1, 1 },
{ 1, 1, 1, 1, 0 }
},
{
{ 0, 1, 1, 1, 0 },
{ 1, 1, 0, 1, 1 },
{ 1, 1, 0, 0, 0 },
{ 1, 1, 0, 0, 0 },
{ 1, 1, 0, 0, 0 },
{ 1, 1, 0, 0, 0 },
{ 1, 1, 0, 1, 1 },
{ 0, 1, 1, 1, 0 }
},
{
{ 1, 1, 1, 1, 0 },
{ 1, 1, 0, 1, 1 },
{ 1, 1, 0, 0, 1 },
{ 1, 1, 0, 0, 1 },
{ 1, 1, 0, 0, 1 },
{ 1, 1, 0, 0, 1 },
{ 1, 1, 0, 1, 1 },
{ 1, 1, 1, 1, 0 }
},
{
{ 1, 1, 1, 1, 1 },
{ 1, 1, 1, 1, 1 },
{ 1, 1, 0, 0, 0 },
{ 1, 1, 1, 1, 1 },
{ 1, 1, 1, 1, 1 },
{ 1, 1, 0, 0, 0 },
{ 1, 1, 1, 1, 1 },
{ 1, 1, 1, 1, 1 }
},
{
{ 1, 1, 1, 1, 1 },
{ 1, 1, 1, 1, 1 },
{ 1, 1, 0, 0, 0 },
{ 1, 1, 1, 1, 1 },
{ 1, 1, 1, 1, 1 },
{ 1, 1, 0, 0, 0 },
{ 1, 1, 0, 0, 0 },
{ 1, 1, 0, 0, 0 }
},
{
{ 1, 1, 1, 1, 1 },
{ 1, 1, 1, 1, 1 },
{ 1, 1, 0, 0, 0 },
{ 1, 1, 0, 0, 0 },
{ 1, 1, 0, 1, 1 },
{ 1, 1, 0, 0, 1 },
{ 1, 1, 0, 0, 1 },
{ 1, 1, 1, 1, 1 }
},
{
{ 1, 1, 0, 1, 1 },
{ 1, 1, 0, 1, 1 },
{ 1, 1, 0, 1, 1 },
{ 1, 1, 1, 1, 1 },
{ 1, 1, 1, 1, 1 },
{ 1, 1, 0, 1, 1 },
{ 1, 1, 0, 1, 1 },
{ 1, 1, 0, 1, 1 }
},
{
{ 1, 1, 1, 1, 1 },
{ 0, 0, 1, 0, 0 },
{ 0, 0, 1, 0, 0 },
{ 0, 0, 1, 0, 0 },
{ 0, 0, 1, 0, 0 },
{ 0, 0, 1, 0, 0 },
{ 0, 0, 1, 0, 0 },
{ 1, 1, 1, 1, 1 }
},
{
{ 1, 1, 1, 1, 1 },
{ 0, 1, 1, 1, 1 },
{ 0, 0, 0, 1, 0 },
{ 0, 0, 0, 1, 0 },
{ 0, 0, 0, 1, 0 },
{ 1, 0, 0, 1, 0 },
{ 1, 0, 0, 1, 0 },
{ 0, 1, 1, 0, 0 }
},
{
{ 1, 1, 0, 0, 1 },
{ 1, 1, 0, 1, 1 },
{ 1, 1, 1, 1, 0 },
{ 1, 1, 1, 0, 0 },
{ 1, 1, 1, 0, 0 },
{ 1, 1, 1, 1, 0 },
{ 1, 1, 0, 1, 1 },
{ 1, 1, 0, 0, 1 }
},
{
{ 1, 1, 0, 0, 0 },
{ 1, 1, 0, 0, 0 },
{ 1, 1, 0, 0, 0 },
{ 1, 1, 0, 0, 0 },
{ 1, 1, 0, 0, 0 },
{ 1, 1, 0, 0, 0 },
{ 1, 1, 1, 1, 1 },
{ 1, 1, 1, 1, 1 }
},
{
{ 1, 0, 0, 0, 1 },
{ 1, 1, 0, 1, 1 },
{ 1, 1, 0, 1, 1 },
{ 1, 0, 1, 0, 1 },
{ 1, 0, 0, 0, 1 },
{ 1, 0, 0, 0, 1 },
{ 1, 0, 0, 0, 1 },
{ 1, 0, 0, 0, 1 }
},
{
{ 1, 0, 0, 0, 1 },
{ 1, 1, 0, 0, 1 },
{ 1, 1, 0, 0, 1 },
{ 1, 0, 1, 0, 1 },
{ 1, 0, 1, 0, 1 },
{ 1, 0, 0, 1, 1 },
{ 1, 0, 0, 1, 1 },
{ 1, 0, 0, 0, 1 }
},
{
{ 1, 1, 1, 1, 1 },
{ 1, 1, 0, 1, 1 },
{ 1, 1, 0, 1, 1 },
{ 1, 1, 0, 1, 1 },
{ 1, 1, 0, 1, 1 },
{ 1, 1, 0, 1, 1 },
{ 1, 1, 0, 1, 1 },
{ 1, 1, 1, 1, 1 }
},
{
{ 1, 1, 1, 1, 0 },
{ 1, 0, 0, 0, 1 },
{ 1, 0, 0, 0, 1 },
{ 1, 0, 0, 0, 1 },
{ 1, 1, 1, 1, 0 },
{ 1, 0, 0, 0, 0 },
{ 1, 0, 0, 0, 0 },
{ 1, 0, 0, 0, 0 }
},
{
{ 1, 1, 1, 1, 1 },
{ 1, 0, 0, 0, 1 },
{ 1, 0, 0, 0, 1 },
{ 1, 0, 0, 0, 1 },
{ 1, 0, 0, 0, 1 },
{ 1, 1, 1, 1, 1 },
{ 0, 0, 0, 1, 0 },
{ 0, 0, 0, 0, 1 }
},
{
{ 1, 1, 1, 1, 0 },
{ 1, 0, 0, 0, 1 },
{ 1, 0, 0, 0, 1 },
{ 1, 1, 1, 1, 0 },
{ 1, 1, 0, 0, 0 },
{ 1, 0, 1, 0, 0 },
{ 1, 0, 0, 1, 0 },
{ 1, 0, 0, 0, 1 }
},
{
{ 0, 1, 1, 1, 1 },
{ 1, 1, 1, 1, 0 },
{ 1, 0, 0, 0, 0 },
{ 1, 1, 1, 1, 0 },
{ 0, 1, 1, 1, 1 },
{ 0, 0, 0, 0, 1 },
{ 1, 1, 1, 1, 1 },
{ 1, 1, 1, 1, 0 }
},
{
{ 1, 1, 1, 1, 1 },
{ 1, 1, 1, 1, 1 },
{ 0, 0, 1, 0, 0 },
{ 0, 0, 1, 0, 0 },
{ 0, 0, 1, 0, 0 },
{ 0, 0, 1, 0, 0 },
{ 0, 0, 1, 0, 0 },
{ 0, 0, 1, 0, 0 }
},
{
{ 1, 0, 0, 0, 1 },
{ 1, 0, 0, 0, 1 },
{ 1, 0, 0, 0, 1 },
{ 1, 0, 0, 0, 1 },
{ 1, 0, 0, 0, 1 },
{ 1, 0, 0, 0, 1 },
{ 0, 1, 1, 1, 0 },
{ 0, 1, 1, 1, 0 }
},
{
{ 1, 0, 0, 0, 1 },
{ 1, 0, 0, 0, 1 },
{ 1, 0, 0, 0, 1 },
{ 1, 0, 0, 0, 1 },
{ 0, 1, 0, 1, 0 },
{ 0, 1, 0, 1, 0 },
{ 0, 0, 1, 0, 0 },
{ 0, 0, 1, 0, 0 }
},
{
{ 1, 0, 0, 0, 1 },
{ 1, 0, 0, 0, 1 },
{ 1, 0, 0, 0, 1 },
{ 1, 0, 1, 0, 1 },
{ 1, 0, 1, 0, 1 },
{ 1, 1, 0, 1, 1 },
{ 1, 1, 0, 1, 1 },
{ 1, 0, 0, 0, 1 }
},
{
{ 1, 0, 0, 0, 1 },
{ 1, 0, 0, 0, 1 },
{ 0, 1, 0, 1, 0 },
{ 0, 1, 1, 1, 0 },
{ 0, 0, 1, 0, 0 },
{ 0, 1, 1, 1, 0 },
{ 1, 1, 0, 1, 1 },
{ 1, 0, 0, 0, 1 }
},
{
{ 1, 0, 0, 0, 1 },
{ 1, 0, 0, 0, 1 },
{ 0, 1, 0, 1, 0 },
{ 0, 1, 1, 1, 0 },
{ 0, 0, 1, 0, 0 },
{ 0, 0, 1, 0, 0 },
{ 0, 0, 1, 0, 0 },
{ 0, 0, 1, 0, 0 }
},
{
{ 1, 1, 1, 1, 1 },
{ 0, 0, 0, 1, 1 },
{ 0, 0, 0, 1, 1 },
{ 0, 0, 1, 1, 0 },
{ 0, 1, 1, 0, 0 },
{ 0, 1, 0, 0, 0 },
{ 1, 1, 0, 0, 0 },
{ 1, 1, 1, 1, 1 }
},
{
{ 0, 0, 0, 0, 0 },
{ 0, 0, 0, 0, 0 },
{ 0, 0, 0, 0, 0 },
{ 0, 0, 0, 0, 0 },
{ 0, 0, 0, 0, 0 },
{ 0, 0, 0, 0, 0 },
{ 0, 0, 0, 0, 0 },
{ 0, 0, 0, 0, 0 }
}
};
int
main(int argc, char **argv)
{
const char *progname = argv[0];
struct options opt;
char *str;
int ch;
opt.f_s = 44100;
opt.low_freq = 400;
opt.high_freq = 1100;
opt.char_gap = 0.1;
opt.duration = 0.4;
while ((ch = getopt(argc, argv, "l:h:r:d:g:")) != -1) {
switch (ch) {
case 'l':
opt.low_freq = atof(optarg);
break;
case 'h':
opt.high_freq = atof(optarg);
break;
case 'r':
opt.f_s = atof(optarg);
break;
case 'd':
opt.duration = atof(optarg);
break;
case 'g':
opt.char_gap = atof(optarg);
break;
default:
usage(progname);
/* NOTREACHED */
}
}
argc -= optind;
argv += optind;
if (!*argv) {
usage(progname);
}
if (isatty(STDOUT_FILENO)) {
fprintf(stderr, "error: refusing to write data to terminal, redirect to an output file\n");
exit(1);
}
str = *argv;
opt.freq_gap = (opt.high_freq - opt.low_freq) / NUM_ROW;
while (*str) {
output_char(&opt, *str);
output_gap(&opt);
++str;
}
return 0;
}
void
output_gap(struct options *opt)
{
int n;
for (n = 0; n < opt->f_s * opt->char_gap; ++n) {
int16_t val = 0;
size_t r = fwrite(&val, sizeof(val), 1, stdout);
if (r != 1) {
fprintf(stderr, "error: failed to write to disk :(\n");
exit(1);
}
}
}
void
output_char(struct options *opt, char c)
{
uint8_t ind;
int n;
int16_t val;
double freq;
int cur_col;
int i;
c = tolower(c);
if (c >= 'a' && c <= 'z') {
ind = c - 'a';
} else {
/* Remap to "space" character for all other characters */
ind = 'z' - 'a' + 1;
}
for (n = 0; n < opt->f_s * opt->duration; ++n) {
cur_col = round(n / (opt->f_s * opt->duration /
(NUM_COL - 1)));
val = 0;
for (i = NUM_ROW - 1; i >= 0; --i) {
if (char_map[ind][i][cur_col] == 0) {
continue;
}
freq = opt->high_freq - (opt->freq_gap * i);
val += AMP * cos(2 * M_PI * freq * n /
opt->f_s);
}
size_t r = fwrite(&val, sizeof(val), 1, stdout);
if (r != 1) {
fprintf(stderr, "error: failed to write to disk :(\n");
exit(1);
}
}
}
void
usage(const char *progname)
{
fprintf(stderr, "usage: %s [-l low_freq (Hz)] "
"[-h high_freq (Hz)] [-r sampling_rate "
"(Hz)] [-d character_duration (sec)] [-g "
"character gap (sec)] string\n", progname);
exit(1);
}