add msvc build to libteletone

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@632 d0543943-73ff-0310-b7d9-9358b9ac24b2

libs/libteletone/src/libteletone.h

@@ -53,6 +53,14 @@ typedef struct {
 	teletone_process_t freqs[TELETONE_MAX_TONES];
 } teletone_tone_map_t;
 
+#if !defined(M_PI)
+/* C99 systems may not define M_PI */
+#define M_PI 3.14159265358979323846264338327
+#endif
+
+#ifdef _MSC_VER
+#define int16_t __int16
+#endif
 
 #include <libteletone_generate.h>
 #include <libteletone_detect.h>

libs/libteletone/src/libteletone_detect.c

@@ -51,7 +51,9 @@
  * detriment.
  */
 #include <math.h>
+#ifndef _MSC_VER
 #include <stdint.h>
+#endif
 #include <string.h>
 #include <stdio.h>
 #include <time.h>

libs/libteletone/src/libteletone_generate.c

@@ -161,7 +161,7 @@ int teletone_mux_tones(teletone_generation_session_t *ts, teletone_tone_map_t *m
 			for (i = 0; i < freqlen; i++) {
 				sample += ((teletone_process_t) 2 * (ts->volume > 0 ? ts->volume : 1) * cos(tones[i] * ts->samples * period));
 			}
-			ts->buffer[ts->samples] = sample;
+			ts->buffer[ts->samples] = (teletone_audio_t)sample;
 			
 			for (c = 1; c < ts->channels; c++) {
 				ts->buffer[ts->samples+1] = ts->buffer[ts->samples];

libs/libteletone/src/libteletone_generate.h

@@ -38,7 +38,9 @@ extern "C" {
 #include <stdio.h>
 #include <string.h>
 #include <math.h>
+#ifndef _MSC_VER
 #include <unistd.h>
+#endif
 #include <fcntl.h>
 #include <sys/types.h>
 #include <errno.h>