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00030 #include "asterisk.h"
00031
00032 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
00033
00034 #include <time.h>
00035 #include <string.h>
00036 #include <stdio.h>
00037 #include <stdlib.h>
00038 #include <unistd.h>
00039 #include <math.h>
00040 #include <ctype.h>
00041
00042 #include "asterisk/ulaw.h"
00043 #include "asterisk/tdd.h"
00044 #include "asterisk/logger.h"
00045 #include "asterisk/fskmodem.h"
00046 #include "ecdisa.h"
00047
00048 struct tdd_state {
00049 fsk_data fskd;
00050 char rawdata[256];
00051 short oldstuff[4096];
00052 int oldlen;
00053 int pos;
00054 int modo;
00055 int mode;
00056 };
00057
00058 static float dr[4], di[4];
00059 static float tddsb = 176.0;
00060
00061 #define TDD_SPACE 1800.0
00062 #define TDD_MARK 1400.0
00063
00064 static int tdd_decode_baudot(struct tdd_state *tdd,unsigned char data)
00065 {
00066 static char ltrs[32] = { '<','E','\n','A',' ','S','I','U',
00067 '\n','D','R','J','N','F','C','K',
00068 'T','Z','L','W','H','Y','P','Q',
00069 'O','B','G','^','M','X','V','^' };
00070 static char figs[32] = { '<','3','\n','-',' ',',','8','7',
00071 '\n','$','4','\'',',','·',':','(',
00072 '5','+',')','2','·','6','0','1',
00073 '9','7','·','^','.','/','=','^' };
00074 int d = 0;
00075 switch (data) {
00076 case 0x1f:
00077 tdd->modo = 0;
00078 break;
00079 case 0x1b:
00080 tdd->modo = 1;
00081 break;
00082 default:
00083 if (tdd->modo == 0)
00084 d = ltrs[data];
00085 else
00086 d = figs[data];
00087 break;
00088 }
00089 return d;
00090 }
00091
00092 void tdd_init(void)
00093 {
00094
00095 dr[0] = cos(TDD_SPACE * 2.0 * M_PI / 8000.0);
00096 di[0] = sin(TDD_SPACE * 2.0 * M_PI / 8000.0);
00097 dr[1] = cos(TDD_MARK * 2.0 * M_PI / 8000.0);
00098 di[1] = sin(TDD_MARK * 2.0 * M_PI / 8000.0);
00099 }
00100
00101 struct tdd_state *tdd_new(void)
00102 {
00103 struct tdd_state *tdd;
00104 tdd = malloc(sizeof(struct tdd_state));
00105 if (tdd) {
00106 memset(tdd, 0, sizeof(struct tdd_state));
00107 tdd->fskd.spb = 176;
00108 tdd->fskd.hdlc = 0;
00109 tdd->fskd.nbit = 5;
00110 tdd->fskd.nstop = 1.5;
00111 tdd->fskd.paridad = 0;
00112 tdd->fskd.bw=0;
00113 tdd->fskd.f_mark_idx = 0;
00114 tdd->fskd.f_space_idx = 1;
00115 tdd->fskd.pcola = 0;
00116 tdd->fskd.cont = 0;
00117 tdd->fskd.x0 = 0.0;
00118 tdd->fskd.state = 0;
00119 tdd->pos = 0;
00120 tdd->mode = 2;
00121 } else
00122 ast_log(LOG_WARNING, "Out of memory\n");
00123 return tdd;
00124 }
00125
00126 int ast_tdd_gen_ecdisa(unsigned char *outbuf, int len)
00127 {
00128 int pos = 0;
00129 int cnt;
00130 while (len) {
00131 cnt = len > sizeof(ecdisa) ? sizeof(ecdisa) : len;
00132 memcpy(outbuf + pos, ecdisa, cnt);
00133 pos += cnt;
00134 len -= cnt;
00135 }
00136 return 0;
00137 }
00138
00139 int tdd_feed(struct tdd_state *tdd, unsigned char *ubuf, int len)
00140 {
00141 int mylen = len;
00142 int olen;
00143 int b = 'X';
00144 int res;
00145 int c,x;
00146 short *buf = malloc(2 * len + tdd->oldlen);
00147 short *obuf = buf;
00148 if (!buf) {
00149 ast_log(LOG_WARNING, "Out of memory\n");
00150 return -1;
00151 }
00152 memset(buf, 0, 2 * len + tdd->oldlen);
00153 memcpy(buf, tdd->oldstuff, tdd->oldlen);
00154 mylen += tdd->oldlen/2;
00155 for (x = 0; x < len; x++)
00156 buf[x + tdd->oldlen / 2] = AST_MULAW(ubuf[x]);
00157 c = res = 0;
00158 while (mylen >= 1320) {
00159 olen = mylen;
00160 res = fsk_serie(&tdd->fskd, buf, &mylen, &b);
00161 if (mylen < 0) {
00162 ast_log(LOG_ERROR, "fsk_serie made mylen < 0 (%d) (olen was %d)\n", mylen, olen);
00163 free(obuf);
00164 return -1;
00165 }
00166 buf += (olen - mylen);
00167 if (res < 0) {
00168 ast_log(LOG_NOTICE, "fsk_serie failed\n");
00169 free(obuf);
00170 return -1;
00171 }
00172 if (res == 1) {
00173
00174 if (b > 0x7f)
00175 continue;
00176 c = tdd_decode_baudot(tdd,b);
00177 if ((c < 1) || (c > 126)) continue;
00178 break;
00179 }
00180 }
00181 if (mylen) {
00182 memcpy(tdd->oldstuff, buf, mylen * 2);
00183 tdd->oldlen = mylen * 2;
00184 } else
00185 tdd->oldlen = 0;
00186 free(obuf);
00187 if (res) {
00188 tdd->mode = 2;
00189
00190 return(c);
00191 }
00192 return 0;
00193 }
00194
00195 void tdd_free(struct tdd_state *tdd)
00196 {
00197 free(tdd);
00198 }
00199
00200 static inline float tdd_getcarrier(float *cr, float *ci, int bit)
00201 {
00202
00203 float t;
00204 t = *cr * dr[bit] - *ci * di[bit];
00205 *ci = *cr * di[bit] + *ci * dr[bit];
00206 *cr = t;
00207
00208 t = 2.0 - (*cr * *cr + *ci * *ci);
00209 *cr *= t;
00210 *ci *= t;
00211 return *cr;
00212 }
00213
00214 #define PUT_BYTE(a) do { \
00215 *(buf++) = (a); \
00216 bytes++; \
00217 } while(0)
00218
00219 #define PUT_AUDIO_SAMPLE(y) do { \
00220 int index = (short)(rint(8192.0 * (y))); \
00221 *(buf++) = AST_LIN2MU(index); \
00222 bytes++; \
00223 } while(0)
00224
00225 #define PUT_TDD_MARKMS do { \
00226 int x; \
00227 for (x=0;x<8;x++) \
00228 PUT_AUDIO_SAMPLE(tdd_getcarrier(&cr, &ci, 1)); \
00229 } while(0)
00230
00231 #define PUT_TDD_BAUD(bit) do { \
00232 while(scont < tddsb) { \
00233 PUT_AUDIO_SAMPLE(tdd_getcarrier(&cr, &ci, bit)); \
00234 scont += 1.0; \
00235 } \
00236 scont -= tddsb; \
00237 } while(0)
00238
00239 #define PUT_TDD_STOP do { \
00240 while(scont < (tddsb * 1.5)) { \
00241 PUT_AUDIO_SAMPLE(tdd_getcarrier(&cr, &ci, 1)); \
00242 scont += 1.0; \
00243 } \
00244 scont -= (tddsb * 1.5); \
00245 } while(0)
00246
00247
00248 #define PUT_TDD(byte) do { \
00249 int z; \
00250 unsigned char b = (byte); \
00251 PUT_TDD_BAUD(0); \
00252 for (z = 0; z < 5; z++) { \
00253 PUT_TDD_BAUD(b & 1); \
00254 b >>= 1; \
00255 } \
00256 PUT_TDD_STOP; \
00257 } while(0);
00258
00259 int tdd_generate(struct tdd_state *tdd, unsigned char *buf, const char *str)
00260 {
00261 int bytes=0;
00262 int i,x;
00263 char c;
00264 static unsigned char lstr[31] = "\000E\nA SIU\rDRJNFCKTZLWHYPQOBG\000MXV";
00265 static unsigned char fstr[31] = "\0003\n- \00787\r$4',!:(5\")2\0006019?&\000./;";
00266
00267 float cr = 1.0;
00268 float ci = 0.0;
00269 float scont = 0.0;
00270
00271 for(x = 0; str[x]; x++) {
00272 c = toupper(str[x]);
00273 #if 0
00274 printf("%c",c); fflush(stdout);
00275 #endif
00276 if (c == 0) {
00277 PUT_TDD(0);
00278 continue;
00279 }
00280 if (c == '\r') {
00281 PUT_TDD(8);
00282 continue;
00283 }
00284 if (c == '\n') {
00285 PUT_TDD(8);
00286 PUT_TDD(2);
00287 continue;
00288 }
00289 if (c == ' ') {
00290 PUT_TDD(4);
00291 continue;
00292 }
00293 for (i = 0; i < 31; i++) {
00294 if (lstr[i] == c)
00295 break;
00296 }
00297 if (i < 31) {
00298 if (tdd->mode) {
00299 PUT_TDD(31);
00300 tdd->mode = 0;
00301 }
00302 PUT_TDD(i);
00303 continue;
00304 }
00305 for (i = 0; i < 31; i++) {
00306 if (fstr[i] == c)
00307 break;
00308 }
00309 if (i < 31) {
00310 if (tdd->mode != 1) {
00311 PUT_TDD(27);
00312 tdd->mode = 1;
00313 }
00314 PUT_TDD(i);
00315 continue;
00316 }
00317 }
00318 return bytes;
00319 }
00320