From: Kevin P. Fleming <kpfleming@digium.com>
Date: Mon, 19 Oct 2009 23:44:07 +0000 (+0000)
Subject: Correct timestamp calculations when RTP sample rates over 8kHz are used.
X-Git-Tag: 1.4.27-rc3~42
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dd9837bba0434805e8bc4c388585923931f95b19;p=thirdparty%2Fasterisk.git

Correct timestamp calculations when RTP sample rates over 8kHz are used.

While testing some endpoints that support 16kHz and 32kHz sample rates, some
log messages were generated due to calc_rxstamp() computing timestamps in a way
that produced odd results, so this patch sanitizes the result of the
computations.


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@224670 65c4cc65-6c06-0410-ace0-fbb531ad65f3
---

diff --git a/main/rtp.c b/main/rtp.c
index 519ecf35cf..12e363809f 100644
--- a/main/rtp.c
+++ b/main/rtp.c
@@ -1045,6 +1045,18 @@ struct ast_frame *ast_rtcp_read(struct ast_rtp *rtp)
 	return f;
 }
 
+static void sanitize_tv(struct timeval *tv)
+{
+	while (tv->tv_usec < 0) {
+		tv->tv_usec += 1000000;
+		tv->tv_sec -= 1;
+	}
+	while (tv->tv_usec >= 1000000) {
+		tv->tv_usec -= 1000000;
+		tv->tv_sec += 1;
+	}
+}
+
 static void calc_rxstamp(struct timeval *tv, struct ast_rtp *rtp, unsigned int timestamp, int mark)
 {
 	struct timeval now;
@@ -1064,21 +1076,14 @@ static void calc_rxstamp(struct timeval *tv, struct ast_rtp *rtp, unsigned int t
 		rtp->rxcore.tv_usec -= (timestamp % rate) * 125;
 		/* Round to 0.1ms for nice, pretty timestamps */
 		rtp->rxcore.tv_usec -= rtp->rxcore.tv_usec % 100;
-		if (rtp->rxcore.tv_usec < 0) {
-			/* Adjust appropriately if necessary */
-			rtp->rxcore.tv_usec += 1000000;
-			rtp->rxcore.tv_sec -= 1;
-		}
+		sanitize_tv(&rtp->rxcore);
 	}
 
 	gettimeofday(&now,NULL);
 	/* rxcore is the mapping between the RTP timestamp and _our_ real time from gettimeofday() */
 	tv->tv_sec = rtp->rxcore.tv_sec + timestamp / rate;
 	tv->tv_usec = rtp->rxcore.tv_usec + (timestamp % rate) * 125;
-	if (tv->tv_usec >= 1000000) {
-		tv->tv_usec -= 1000000;
-		tv->tv_sec += 1;
-	}
+	sanitize_tv(tv);
 	prog = (double)((timestamp-rtp->seedrxts)/(float)(rate));
 	dtv = (double)rtp->drxcore + (double)(prog);
 	current_time = (double)now.tv_sec + (double)now.tv_usec/1000000;