Bug fixes to tdd support in zaptel.

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@89042 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/tdd.c

@@ -53,6 +53,7 @@ struct tdd_state {
 	int pos;
 	int modo;
 	int mode;
+	int charnum;
 };
 
 static float dr[4], di[4];
@@ -67,10 +68,10 @@ static int tdd_decode_baudot(struct tdd_state *tdd,unsigned char data)	/* covert
 	                         '\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','$','4','\'',',','·',':','(',
-	                         '5','+',')','2','·','6','0','1',
-	                         '9','7','·','^','.','/','=','^' };
+	static char figs[32] = { '<','3','\n','-',' ','\'','8','7',
+	                         '\n','$','4','\'',',','!',':','(',
+	                         '5','\"',')','2','=','6','0','1',
+	                         '9','?','+','^','.','/',';','^' };
 	int d = 0;  /* return 0 if not decodeable */
 	switch (data) {
 	case 0x1f:
@@ -101,9 +102,8 @@ void tdd_init(void)
 struct tdd_state *tdd_new(void)
 {
 	struct tdd_state *tdd;
-	tdd = malloc(sizeof(struct tdd_state));
+	tdd = calloc(1, sizeof(*tdd));
 	if (tdd) {
-		memset(tdd, 0, sizeof(struct tdd_state));
 		tdd->fskd.spb = 176;        /* 45.5 baud */
 		tdd->fskd.hdlc = 0;         /* Async */
 		tdd->fskd.nbit = 5;         /* 5 bits */
@@ -117,7 +117,8 @@ struct tdd_state *tdd_new(void)
 		tdd->fskd.x0 = 0.0;
 		tdd->fskd.state = 0;
 		tdd->pos = 0;
-		tdd->mode = 2;
+		tdd->mode = 0;
+		tdd->charnum = 0;
 	} else
 		ast_log(LOG_WARNING, "Out of memory\n");
 	return tdd;
@@ -143,13 +144,12 @@ int tdd_feed(struct tdd_state *tdd, unsigned char *ubuf, int len)
 	int b = 'X';
 	int res;
 	int c,x;
-	short *buf = malloc(2 * len + tdd->oldlen);
+	short *buf = calloc(1, 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++) 
@@ -159,13 +159,13 @@ int tdd_feed(struct tdd_state *tdd, unsigned char *ubuf, int len)
 		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);
+			ast_log(LOG_ERROR, "fsk_serial 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");
+			ast_log(LOG_NOTICE, "fsk_serial failed\n");
 			free(obuf);
 			return -1;
 		}
@@ -174,7 +174,8 @@ int tdd_feed(struct tdd_state *tdd, unsigned char *ubuf, int len)
 			if (b > 0x7f)
 				continue;
 			c = tdd_decode_baudot(tdd,b);
-			if ((c < 1) || (c > 126)) continue; /* if not valid */
+			if ((c < 1) || (c > 126))
+				continue; /* if not valid */
 			break;
 		}
 	}
@@ -185,7 +186,8 @@ int tdd_feed(struct tdd_state *tdd, unsigned char *ubuf, int len)
 		tdd->oldlen = 0;
 	free(obuf);
 	if (res) {
-		tdd->mode = 2; /* put it in mode where it
+		tdd->mode = 2; 
+/* put it in mode where it
 			reliably puts teleprinter in correct shift mode */
 		return(c);
 	}
@@ -229,7 +231,7 @@ static inline float tdd_getcarrier(float *cr, float *ci, int bit)
 } while(0)
 
 #define PUT_TDD_BAUD(bit) do { \
-	while(scont < tddsb) { \
+	while (scont < tddsb) { \
 		PUT_AUDIO_SAMPLE(tdd_getcarrier(&cr, &ci, bit)); \
 		scont += 1.0; \
 	} \
@@ -237,7 +239,7 @@ static inline float tdd_getcarrier(float *cr, float *ci, int bit)
 } while(0)
 
 #define PUT_TDD_STOP do { \
-	while(scont < (tddsb * 1.5)) { \
+	while (scont < (tddsb * 1.5)) { \
 		PUT_AUDIO_SAMPLE(tdd_getcarrier(&cr, &ci, 1)); \
 		scont += 1.0; \
 	} \
@@ -261,14 +263,20 @@ int tdd_generate(struct tdd_state *tdd, unsigned char *buf, const char *str)
 	int bytes=0;
 	int i,x;
 	char	c;
+	/*! Baudot letters */
 	static unsigned char lstr[31] = "\000E\nA SIU\rDRJNFCKTZLWHYPQOBG\000MXV";
-	static unsigned char fstr[31] = "\0003\n- \00787\r$4',!:(5\")2\0006019?&\000./;";
+	/*! Baudot figures */
+	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++) {
+		/* Do synch for each 72th character */
+		if ( (tdd->charnum++) % 72 == 0) 
+			PUT_TDD(tdd->mode ? 27 /* FIGS */ : 31 /* LTRS */);
+
 		c = toupper(str[x]);
 #if	0
 		printf("%c",c); fflush(stdout);