58 static float dr[4], di[4];
59 static float tddsb = 176.0;
61 #define TDD_SPACE 1800.0
62 #define TDD_MARK 1400.0
64 static int tdd_decode_baudot(
struct tdd_state *tdd,
unsigned char data)
66 static char ltrs[32] = {
'<',
'E',
'\n',
'A',
' ',
'S',
'I',
'U',
67 '\n',
'D',
'R',
'J',
'N',
'F',
'C',
'K',
68 'T',
'Z',
'L',
'W',
'H',
'Y',
'P',
'Q',
69 'O',
'B',
'G',
'^',
'M',
'X',
'V',
'^' };
70 static char figs[32] = {
'<',
'3',
'\n',
'-',
' ',
'\'',
'8',
'7',
71 '\n',
'$',
'4',
'\'',
',',
'!',
':',
'(',
72 '5',
'\"',
')',
'2',
'=',
'6',
'0',
'1',
73 '9',
'?',
'+',
'^',
'.',
'/',
';',
'^' };
97 dr[0] = cos(TDD_SPACE * 2.0 * M_PI / 8000.0);
98 di[0] = sin(TDD_SPACE * 2.0 * M_PI / 8000.0);
99 dr[1] = cos(TDD_MARK * 2.0 * M_PI / 8000.0);
100 di[1] = sin(TDD_MARK * 2.0 * M_PI / 8000.0);
108 #ifdef INTEGER_CALLERID
109 tdd->fskd.ispb = 176;
111 tdd->fskd.
pllispb = (int)((8000 * 32 * 2) / 90);
112 tdd->fskd.pllids = tdd->fskd.
pllispb / 32;
113 tdd->fskd.pllispb2 = tdd->fskd.
pllispb / 2;
125 fskmodem_init(&tdd->fskd);
130 tdd->fskd.
nstop = 1.5;
144 ast_log(LOG_WARNING,
"Out of memory\n");
153 cnt = len >
sizeof(ecdisa) ?
sizeof(ecdisa) : len;
154 memcpy(outbuf + pos, ecdisa, cnt);
168 short *buf =
ast_calloc(1, 2 * len + tdd->oldlen);
171 ast_log(LOG_WARNING,
"Out of memory\n");
174 memcpy(buf, tdd->oldstuff, tdd->oldlen);
175 mylen += tdd->oldlen / 2;
176 for (x = 0; x < len; x++)
177 buf[x + tdd->oldlen / 2] = AST_MULAW(ubuf[x]);
179 while (mylen >= 1320) {
181 res =
fsk_serial(&tdd->fskd, buf, &mylen, &b);
183 ast_log(LOG_ERROR,
"fsk_serial made mylen < 0 (%d) (olen was %d)\n", mylen, olen);
187 buf += (olen - mylen);
189 ast_log(LOG_NOTICE,
"fsk_serial failed\n");
197 c = tdd_decode_baudot(tdd, b);
198 if ((c < 1) || (c > 126))
204 memcpy(tdd->oldstuff, buf, mylen * 2);
205 tdd->oldlen = mylen * 2;
223 static inline float tdd_getcarrier(
float *cr,
float *ci,
int bit)
227 t = *cr * dr[bit] - *ci * di[bit];
228 *ci = *cr * di[bit] + *ci * dr[bit];
231 t = 2.0 - (*cr * *cr + *ci * *ci);
237 #define PUT_BYTE(a) do { \
242 #define PUT_AUDIO_SAMPLE(y) do { \
243 int __pas_idx = (short)(rint(8192.0 * (y))); \
244 *(buf++) = AST_LIN2MU(__pas_idx); \
248 #define PUT_TDD_MARKMS do { \
250 for (x = 0; x < 8; x++) \
251 PUT_AUDIO_SAMPLE(tdd_getcarrier(&cr, &ci, 1)); \
254 #define PUT_TDD_BAUD(bit) do { \
255 while (scont < tddsb) { \
256 PUT_AUDIO_SAMPLE(tdd_getcarrier(&cr, &ci, bit)); \
262 #define PUT_TDD_STOP do { \
263 while (scont < (tddsb * 1.5)) { \
264 PUT_AUDIO_SAMPLE(tdd_getcarrier(&cr, &ci, 1)); \
267 scont -= (tddsb * 1.5); \
271 #define PUT_TDD(byte) do { \
273 unsigned char b = (byte); \
275 for (z = 0; z < 5; z++) { \
276 PUT_TDD_BAUD(b & 1); \
288 float scont = 0.0, cr = 1.0, ci=0.0;
289 while (scont < tddsb * 10.0) {
290 PUT_AUDIO_SAMPLE(tdd_getcarrier(&cr, &ci, 1));
302 static unsigned char lstr[31] =
"\000E\nA SIU\rDRJNFCKTZLWHYPQOBG\000MXV";
304 static unsigned char fstr[31] =
"\0003\n- \00787\r$4',!:(5\")2\0006019?+\000./;";
310 for(x = 0; str[x]; x++) {
312 if ( (tdd->charnum++) % 72 == 0)
313 PUT_TDD(tdd->mode ? 27 : 31 );
317 printf(
"%c",c); fflush(stdout);
336 for (i = 0; i < 31; i++) {
348 for (i = 0; i < 31; i++) {
353 if (tdd->mode != 1) {
void tdd_free(struct tdd_state *tdd)
Asterisk main include file. File version handling, generic pbx functions.
int tdd_gen_holdtone(unsigned char *buf)
Time-related functions and macros.
int tdd_feed(struct tdd_state *tdd, unsigned char *ubuf, int len)
int ast_tdd_gen_ecdisa(unsigned char *outbuf, int len)
u-Law to Signed linear conversion
TTY/TDD Generation support.
int tdd_generate(struct tdd_state *tdd, unsigned char *buf, const char *str)
#define ast_calloc(num, len)
A wrapper for calloc()
Support for logging to various files, console and syslog Configuration in file logger.conf.
struct tdd_state * tdd_new(void)
int fsk_serial(fsk_data *fskd, short *buffer, int *len, int *outbyte)
Retrieve a serial byte into outbyte. Buffer is a pointer into a series of shorts and len records the ...