backport change from the iaxclient sf repository rev 648, 649, 650, 656.

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@5158 d0543943-73ff-0310-b7d9-9358b9ac24b2

libs/iax/src/iax-client.h

@@ -226,6 +226,10 @@ extern unsigned int iax_session_get_capability(struct iax_session *s);
 extern char iax_pref_codec_add(struct iax_session *session, unsigned int format);
 extern void iax_pref_codec_del(struct iax_session *session, unsigned int format);
 extern int iax_pref_codec_get(struct iax_session *session, unsigned int *array, int len);
+
+/* Fine tune jitterbuffer */
+extern void iax_set_jb_target_extra( long value );
+
 extern char *iax_get_peer_ip(struct iax_session *session);
 extern char *iax_event_get_apparent_ip(struct iax_event *event);
 extern void iax_set_samplerate(struct iax_session *session, unsigned short samplemask);

libs/iax/src/iax.c

@@ -140,6 +140,9 @@ static int netfd = -1;
 /* Max timeouts */
 static int maxretries = 10;
 
+/* configurable jitterbuffer options */
+static long jb_target_extra = -1; 
+
 static int do_shutdown = 0;
 
 /* external global networking replacements */
@@ -521,6 +524,7 @@ struct iax_session *iax_session_new(void)
 			jbconf.max_jitterbuf = 0;
 			jbconf.resync_threshold = 1000;
 			jbconf.max_contig_interp = 0;
+			jbconf.target_extra = jb_target_extra;
 			jb_setconf(s->jb, &jbconf);
 		}
 #endif
@@ -944,6 +948,12 @@ int iax_shutdown(void)
 	return do_shutdown++;
 }
 
+void iax_set_jb_target_extra( long value )
+{
+	/* store in jb_target_extra, a static global */
+	jb_target_extra = value ;
+}
+
 int iax_init(char *ip, int preferredportno)
 {
 	int portno = preferredportno;