From 2e814d0329aded98c811d0502839618f08642685 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Storsj=C3=B6?= <martin@martin.st>
Date: Wed, 9 Jan 2013 18:55:52 +0200
Subject: [PATCH] rtpenc: Simplify code by introducing a macro for rescaling
 NTP timestamps
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Signed-off-by: Martin Storsjö <martin@martin.st>
---
 libavformat/rtp.h    | 3 +++
 libavformat/rtpenc.c | 3 +--
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/libavformat/rtp.h b/libavformat/rtp.h
index f8d406ea88..feaf167965 100644
--- a/libavformat/rtp.h
+++ b/libavformat/rtp.h
@@ -23,6 +23,7 @@
 
 #include "libavformat/avformat.h"
 #include "libavcodec/avcodec.h"
+#include "libavutil/mathematics.h"
 
 /**
  * Return the payload type for a given stream used in the given format context.
@@ -109,4 +110,6 @@ enum RTCPType {
 #define RTP_PT_IS_RTCP(x) (((x) >= RTCP_FIR && (x) <= RTCP_IJ) || \
                            ((x) >= RTCP_SR  && (x) <= RTCP_TOKEN))
 
+#define NTP_TO_RTP_FORMAT(x) av_rescale((x), INT64_C(1) << 32, 1000000)
+
 #endif /* AVFORMAT_RTP_H */
diff --git a/libavformat/rtpenc.c b/libavformat/rtpenc.c
index c82a73a84c..d33060770e 100644
--- a/libavformat/rtpenc.c
+++ b/libavformat/rtpenc.c
@@ -273,8 +273,7 @@ static void rtcp_send_sr(AVFormatContext *s1, int64_t ntp_time)
     avio_w8(s1->pb, RTCP_SR);
     avio_wb16(s1->pb, 6); /* length in words - 1 */
     avio_wb32(s1->pb, s->ssrc);
-    avio_wb32(s1->pb, ntp_time / 1000000);
-    avio_wb32(s1->pb, ((ntp_time % 1000000) << 32) / 1000000);
+    avio_wb64(s1->pb, NTP_TO_RTP_FORMAT(ntp_time));
     avio_wb32(s1->pb, rtp_ts);
     avio_wb32(s1->pb, s->packet_count);
     avio_wb32(s1->pb, s->octet_count);