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/*
* gen_zvei.c -- generate DTMF sequences
*
* Copyright (C) 1997
* Thomas Sailer (sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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 General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* ---------------------------------------------------------------------- */
#include "gen.h"
#include <string.h>
#include <ctype.h>
#include <stdio.h>
/* ---------------------------------------------------------------------- */
#define PHINC(x) ((float)(x)*0x10000/SAMPLE_RATE)
static const unsigned int zvei_freq[16] = {
PHINC(2400), PHINC(1060), PHINC(1160), PHINC(1270),
PHINC(1400), PHINC(1530), PHINC(1670), PHINC(1830),
PHINC(2000), PHINC(2200), PHINC(2800), PHINC(810),
PHINC(970), PHINC(886), PHINC(2600), PHINC(0)
};
static const unsigned int zveis_freq[16] = {
PHINC(2400), PHINC(1060), PHINC(1160), PHINC(1270),
PHINC(1400), PHINC(1530), PHINC(1670), PHINC(1830),
PHINC(2000), PHINC(2200), PHINC(886), PHINC(810),
PHINC(740), PHINC(680), PHINC(970), PHINC(0)
};
void gen_init_zvei(struct gen_params *p, struct gen_state *s)
{
memset(s, 0, sizeof(struct gen_state));
}
int gen_zvei(signed short *buf, int buflen, struct gen_params *p, struct gen_state *s)
{
char c;
int num = 0, i;
for (; buflen > 0; buflen--, buf++, num++) {
if (s->s.zvei.time <= 0) {
c = p->p.zvei.str[s->s.zvei.ch_idx];
if (!c)
return num;
s->s.zvei.ch_idx++;
if (!isxdigit(c)) {
s->s.zvei.time = s->s.zvei.time2 = 1;
fprintf(stderr, "gen: zvei; invalid char '%c'\n", c);
} else {
s->s.zvei.time = p->p.zvei.duration + p->p.zvei.pause;
s->s.zvei.time2 = p->p.zvei.duration;
if (c >= '0' && c <= '9')
i = c - '0';
else if (c >= 'A' && c <= 'F')
i = c - 'A' + 10;
else
i = c - 'a' + 10;
s->s.zvei.phinc = zvei_freq[i & 0xf];
}
} else if (!s->s.zvei.time2) {
s->s.zvei.phinc = 0;
s->s.zvei.ph = 0xc000;
}
s->s.zvei.time--;
s->s.zvei.time2--;
*buf += (p->ampl * COS(s->s.zvei.ph)) >> 15;
s->s.zvei.ph += s->s.zvei.phinc;
}
return num;
}
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