From: Stefan Knoblich <stkn@openisdn.net>
Date: Thu, 26 Jul 2012 07:06:08 +0000 (+0200)
Subject: ftmod_isdn: Fix per-channel teletone buffer offset wraparound.
X-Git-Tag: v1.2.0~59
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=5ebc68fb51a76efc8574a4b6d92b05340e7c2c72;p=thirdparty%2Ffreeswitch.git

ftmod_isdn: Fix per-channel teletone buffer offset wraparound.

Do a "soft" wraparound with modulo, removes the ~0.5s tone glitch.
(Multiply ts.rate (samples) by two to match the offset unit (bytes, 2 per sample).)

Signed-off-by: Stefan Knoblich <stkn@openisdn.net>
---

diff --git a/libs/freetdm/src/ftmod/ftmod_isdn/ftmod_isdn.c b/libs/freetdm/src/ftmod/ftmod_isdn/ftmod_isdn.c
index bd00789248..de53002b79 100644
--- a/libs/freetdm/src/ftmod/ftmod_isdn/ftmod_isdn.c
+++ b/libs/freetdm/src/ftmod/ftmod_isdn/ftmod_isdn.c
@@ -1964,9 +1964,7 @@ static void *ftdm_isdn_tones_run(ftdm_thread_t *me, void *obj)
 					data->offset += rlen;
 				}
 
-				if (data->offset >= ts.rate) {
-					data->offset = 0;
-				}
+				data->offset %= (ts.rate << 1);
 			}
 		}