From e095a604ab2c089063776a1d26224b71bf771f81 Mon Sep 17 00:00:00 2001
From: xiongziliang <771730766@qq.com>
Date: Fri, 19 Jul 2019 09:42:48 +0800
Subject: [PATCH] =?UTF-8?q?=E6=9B=B4=E6=96=B0ssrc=E7=94=9F=E6=88=90?=
 =?UTF-8?q?=E8=A7=84=E5=88=99?=
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---
 src/Extension/Factory.cpp | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/src/Extension/Factory.cpp b/src/Extension/Factory.cpp
index 276f88b7..ced72b6e 100644
--- a/src/Extension/Factory.cpp
+++ b/src/Extension/Factory.cpp
@@ -118,9 +118,20 @@ Track::Ptr Factory::getTrackByCodecId(CodecId codecId) {
 RtpCodec::Ptr Factory::getRtpEncoderBySdp(const Sdp::Ptr &sdp) {
     GET_CONFIG(uint32_t,audio_mtu,Rtp::kAudioMtuSize);
     GET_CONFIG(uint32_t,video_mtu,Rtp::kVideoMtuSize);
-    // ssrc不冲突即可
-    static atomic_int32_t s_ssrc(0x10000000);
-    uint32_t ssrc = ++s_ssrc;
+    // ssrc不冲突即可,可以为任意的32位整形
+    static atomic<uint32_t> s_ssrc(0);
+    uint32_t ssrc = s_ssrc++;
+    if(!ssrc){
+        //ssrc不能为0
+        ssrc = 1;
+    }
+    if(sdp->getTrackType() == TrackVideo){
+        //视频的ssrc是偶数，方便调试
+        ssrc = 2 * ssrc;
+    }else{
+        //音频ssrc是奇数
+        ssrc = 2 * ssrc + 1;
+    }
     auto mtu = (sdp->getTrackType() == TrackVideo ? video_mtu : audio_mtu);
     auto sample_rate = sdp->getSampleRate();
     auto pt = sdp->getPlayloadType();