mirror of https://github.com/asterisk/asterisk
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@390 65c4cc65-6c06-0410-ace0-fbb531ad65f31.0
Mark Spencer
24 years ago
parent
42a1f82af3
commit
3a8facf06d
@ -0,0 +1,306 @@
|
||||
/*
|
||||
* Asterisk -- A telephony toolkit for Linux.
|
||||
*
|
||||
* TTY/TDD Generation support
|
||||
*
|
||||
* Copyright (C) 2001, Linux Support Services, Inc.
|
||||
*
|
||||
* Mark Spencer <markster@linux-support.net>
|
||||
*
|
||||
* This program is free software, distributed under the terms of
|
||||
* the GNU General Public License.
|
||||
*
|
||||
* Includes code and algorithms from the Zapata library.
|
||||
*
|
||||
*/
|
||||
|
||||
#include <time.h>
|
||||
#include <string.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <unistd.h>
|
||||
#include <math.h>
|
||||
#include <ctype.h>
|
||||
#include <asterisk/ulaw.h>
|
||||
#include <asterisk/tdd.h>
|
||||
#include <asterisk/logger.h>
|
||||
#include <asterisk/fskmodem.h>
|
||||
#include "ecdisa.h"
|
||||
|
||||
|
||||
struct tdd_state {
|
||||
fsk_data fskd;
|
||||
char rawdata[256];
|
||||
short oldstuff[4096];
|
||||
int oldlen;
|
||||
int pos;
|
||||
int modo;
|
||||
int mode;
|
||||
};
|
||||
|
||||
static float dr[4], di[4];
|
||||
static float tddsb = 176.0; /* 45.5 baud */
|
||||
|
||||
#define TDD_SPACE 1800.0 /* 1800 hz for "0" */
|
||||
#define TDD_MARK 1400.0 /* 1400 hz for "1" */
|
||||
|
||||
static int tdd_decode_baudot(struct tdd_state *tdd,unsigned char data) /* covert baudot into ASCII */
|
||||
{
|
||||
static char ltrs[32]={'<','E','\n','A',' ','S','I','U',
|
||||
'\n','D','R','J','N','F','C','K',
|
||||
'T','Z','L','W','H','Y','P','Q',
|
||||
'O','B','G','^','M','X','V','^'};
|
||||
static char figs[32]={'<','3','\n','-',' ',',','8','7',
|
||||
'\n','$','4','\'',',','·',':','(',
|
||||
'5','+',')','2','·','6','0','1',
|
||||
'9','7','·','^','.','/','=','^'};
|
||||
int d;
|
||||
d=0; /* return 0 if not decodeable */
|
||||
switch (data) {
|
||||
case 0x1f : tdd->modo=0; break;
|
||||
case 0x1b : tdd->modo=1; break;
|
||||
default: if (tdd->modo==0) d=ltrs[data]; else d=figs[data]; break;
|
||||
}
|
||||
return d;
|
||||
}
|
||||
|
||||
void tdd_init(void)
|
||||
{
|
||||
/* Initialize stuff for inverse FFT */
|
||||
dr[0] = cos(TDD_SPACE * 2.0 * M_PI / 8000.0);
|
||||
di[0] = sin(TDD_SPACE * 2.0 * M_PI / 8000.0);
|
||||
dr[1] = cos(TDD_MARK * 2.0 * M_PI / 8000.0);
|
||||
di[1] = sin(TDD_MARK * 2.0 * M_PI / 8000.0);
|
||||
}
|
||||
|
||||
struct tdd_state *tdd_new(void)
|
||||
{
|
||||
struct tdd_state *tdd;
|
||||
tdd = malloc(sizeof(struct tdd_state));
|
||||
memset(tdd, 0, sizeof(struct tdd_state));
|
||||
if (tdd) {
|
||||
tdd->fskd.spb = 176; /* 45.5 baud */
|
||||
tdd->fskd.hdlc = 0; /* Async */
|
||||
tdd->fskd.nbit = 5; /* 5 bits */
|
||||
tdd->fskd.nstop = 1.5; /* 1.5 stop bits */
|
||||
tdd->fskd.paridad = 0; /* No parity */
|
||||
tdd->fskd.bw=0; /* Filter 75 Hz */
|
||||
tdd->fskd.f_mark_idx = 0; /* 1400 Hz */
|
||||
tdd->fskd.f_space_idx = 1; /* 1800 Hz */
|
||||
tdd->fskd.pcola = 0; /* No clue */
|
||||
tdd->fskd.cont = 0; /* Digital PLL reset */
|
||||
tdd->fskd.x0 = 0.0;
|
||||
tdd->fskd.state = 0;
|
||||
tdd->pos = 0;
|
||||
tdd->mode = 2;
|
||||
} else
|
||||
ast_log(LOG_WARNING, "Out of memory\n");
|
||||
return tdd;
|
||||
}
|
||||
|
||||
int ast_tdd_gen_ecdisa(unsigned char *outbuf, int len)
|
||||
{
|
||||
int pos = 0;
|
||||
int cnt;
|
||||
while(len) {
|
||||
cnt = len;
|
||||
if (cnt > sizeof(ecdisa))
|
||||
cnt = sizeof(ecdisa);
|
||||
memcpy(outbuf + pos, ecdisa, cnt);
|
||||
pos += cnt;
|
||||
len -= cnt;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
int tdd_feed(struct tdd_state *tdd, unsigned char *ubuf, int len)
|
||||
{
|
||||
int mylen = len;
|
||||
int olen;
|
||||
int b = 'X';
|
||||
int res;
|
||||
int c,x;
|
||||
short *buf = malloc(2 * len + tdd->oldlen);
|
||||
short *obuf = buf;
|
||||
if (!buf) {
|
||||
ast_log(LOG_WARNING, "Out of memory\n");
|
||||
return -1;
|
||||
}
|
||||
memset(buf, 0, 2 * len + tdd->oldlen);
|
||||
memcpy(buf, tdd->oldstuff, tdd->oldlen);
|
||||
mylen += tdd->oldlen/2;
|
||||
for (x=0;x<len;x++)
|
||||
buf[x+tdd->oldlen/2] = AST_MULAW(ubuf[x]);
|
||||
c = res = 0;
|
||||
while(mylen >= 1320) { /* has to have enough to work on */
|
||||
olen = mylen;
|
||||
res = fsk_serie(&tdd->fskd, buf, &mylen, &b);
|
||||
if (mylen < 0) {
|
||||
ast_log(LOG_ERROR, "fsk_serie made mylen < 0 (%d) (olen was %d)\n", mylen,olen);
|
||||
free(obuf);
|
||||
return -1;
|
||||
}
|
||||
buf += (olen - mylen);
|
||||
if (res < 0) {
|
||||
ast_log(LOG_NOTICE, "fsk_serie failed\n");
|
||||
free(obuf);
|
||||
return -1;
|
||||
}
|
||||
if (res == 1) {
|
||||
/* Ignore invalid bytes */
|
||||
if (b > 0x7f)
|
||||
continue;
|
||||
c = tdd_decode_baudot(tdd,b);
|
||||
if ((c < 1) || (c > 126)) continue; /* if not valid */
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (mylen) {
|
||||
memcpy(tdd->oldstuff, buf, mylen * 2);
|
||||
tdd->oldlen = mylen * 2;
|
||||
} else
|
||||
tdd->oldlen = 0;
|
||||
free(obuf);
|
||||
if (res) {
|
||||
tdd->mode = 2; /* put it in mode where it
|
||||
reliably puts teleprinter in correct shift mode */
|
||||
return(c);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
void tdd_free(struct tdd_state *tdd)
|
||||
{
|
||||
free(tdd);
|
||||
}
|
||||
|
||||
static inline float tdd_getcarrier(float *cr, float *ci, int bit)
|
||||
{
|
||||
/* Move along. There's nothing to see here... */
|
||||
float t;
|
||||
t = *cr * dr[bit] - *ci * di[bit];
|
||||
*ci = *cr * di[bit] + *ci * dr[bit];
|
||||
*cr = t;
|
||||
|
||||
t = 2.0 - (*cr * *cr + *ci * *ci);
|
||||
*cr *= t;
|
||||
*ci *= t;
|
||||
return *cr;
|
||||
}
|
||||
|
||||
#define PUT_BYTE(a) do { \
|
||||
*(buf++) = (a); \
|
||||
bytes++; \
|
||||
} while(0)
|
||||
|
||||
#define PUT_AUDIO_SAMPLE(y) do { \
|
||||
int index = (short)(rint(8192.0 * (y))); \
|
||||
*(buf++) = AST_LIN2MU(index); \
|
||||
bytes++; \
|
||||
} while(0)
|
||||
|
||||
#define PUT_TDD_MARKMS do { \
|
||||
int x; \
|
||||
for (x=0;x<8;x++) \
|
||||
PUT_AUDIO_SAMPLE(tdd_getcarrier(&cr, &ci, 1)); \
|
||||
} while(0)
|
||||
|
||||
#define PUT_TDD_BAUD(bit) do { \
|
||||
while(scont < tddsb) { \
|
||||
PUT_AUDIO_SAMPLE(tdd_getcarrier(&cr, &ci, bit)); \
|
||||
scont += 1.0; \
|
||||
} \
|
||||
scont -= tddsb; \
|
||||
} while(0)
|
||||
|
||||
#define PUT_TDD_STOP do { \
|
||||
while(scont < (tddsb * 1.5)) { \
|
||||
PUT_AUDIO_SAMPLE(tdd_getcarrier(&cr, &ci, 1)); \
|
||||
scont += 1.0; \
|
||||
} \
|
||||
scont -= (tddsb * 1.5); \
|
||||
} while(0)
|
||||
|
||||
|
||||
#define PUT_TDD(byte) do { \
|
||||
int z; \
|
||||
unsigned char b = (byte); \
|
||||
PUT_TDD_BAUD(0); /* Start bit */ \
|
||||
for (z=0;z<5;z++) { \
|
||||
PUT_TDD_BAUD(b & 1); \
|
||||
b >>= 1; \
|
||||
} \
|
||||
PUT_TDD_STOP; /* Stop bit */ \
|
||||
} while(0);
|
||||
|
||||
int tdd_generate(struct tdd_state *tdd, unsigned char *buf, char *str)
|
||||
{
|
||||
int bytes=0;
|
||||
int i,x;
|
||||
char c;
|
||||
static unsigned char lstr[31] = "\000E\nA SIU\rDRJNFCKTZLWHYPQOBG\000MXV";
|
||||
static unsigned char fstr[31] = "\0003\n- \00787\r$4',!:(5\")2\0006019?&\000./;";
|
||||
/* Initial carriers (real/imaginary) */
|
||||
float cr = 1.0;
|
||||
float ci = 0.0;
|
||||
float scont = 0.0;
|
||||
|
||||
for(x = 0; str[x]; x++) {
|
||||
c = toupper(str[x]);
|
||||
#if 0
|
||||
printf("%c",c); fflush(stdout);
|
||||
#endif
|
||||
if (c == 0) /* send null */
|
||||
{
|
||||
PUT_TDD(0);
|
||||
continue;
|
||||
}
|
||||
if (c == '\r') /* send c/r */
|
||||
{
|
||||
PUT_TDD(8);
|
||||
continue;
|
||||
}
|
||||
if (c == '\n') /* send c/r and l/f */
|
||||
{
|
||||
PUT_TDD(8);
|
||||
PUT_TDD(2);
|
||||
continue;
|
||||
}
|
||||
if (c == ' ') /* send space */
|
||||
{
|
||||
PUT_TDD(4);
|
||||
continue;
|
||||
}
|
||||
for(i = 0; i < 31; i++)
|
||||
{
|
||||
if (lstr[i] == c) break;
|
||||
}
|
||||
if (i < 31) /* if we found it */
|
||||
{
|
||||
if (tdd->mode) /* if in figs mode, change it */
|
||||
{
|
||||
PUT_TDD(31); /* Send LTRS */
|
||||
tdd->mode = 0;
|
||||
}
|
||||
PUT_TDD(i);
|
||||
continue;
|
||||
}
|
||||
for(i = 0; i < 31; i++)
|
||||
{
|
||||
if (fstr[i] == c) break;
|
||||
}
|
||||
if (i < 31) /* if we found it */
|
||||
{
|
||||
if (tdd->mode != 1) /* if in ltrs mode, change it */
|
||||
{
|
||||
PUT_TDD(27); /* send FIGS */
|
||||
tdd->mode = 1;
|
||||
}
|
||||
PUT_TDD(i); /* send byte */
|
||||
continue;
|
||||
}
|
||||
}
|
||||
return bytes;
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in new issue