前移时间戳生成逻辑，防止耗时代码干扰时间戳精度

webrtc/TwccContext.cpp

@@ -19,7 +19,7 @@ enum class ExtSeqStatus : int {
     jumped,
 };
 
-void TwccContext::onRtp(uint32_t ssrc, uint16_t twcc_ext_seq) {
+void TwccContext::onRtp(uint32_t ssrc, uint16_t twcc_ext_seq, uint64_t stamp_ms) {
     switch ((ExtSeqStatus) checkSeqStatus(twcc_ext_seq)) {
         case ExtSeqStatus::jumped: /*回环后，收到回环前的大ext seq包,过滤掉*/ return;
         case ExtSeqStatus::looped: /*回环，触发发送twcc rtcp*/ onSendTwcc(ssrc); break;
@@ -27,7 +27,7 @@ void TwccContext::onRtp(uint32_t ssrc, uint16_t twcc_ext_seq) {
         default: /*不可达*/assert(0); break;
     }
 
-    auto result = _rtp_recv_status.emplace(twcc_ext_seq, _ticker.createdTime());
+    auto result = _rtp_recv_status.emplace(twcc_ext_seq, stamp_ms);
     if (!result.second) {
         WarnL << "recv same twcc ext seq:" << twcc_ext_seq;
         return;
@@ -80,7 +80,9 @@ void TwccContext::onSendTwcc(uint32_t ssrc) {
     auto max = _rtp_recv_status.rbegin()->first;
     auto begin = _rtp_recv_status.begin();
     auto min = begin->first;
+    //参考时间戳的最小单位是64ms
     auto ref_time = begin->second >> 6;
+    //还原基准时间戳
     auto last_time = ref_time << 6;
     FCI_TWCC::TwccPacketStatus status;
     for (auto seq = min; seq <= max; ++seq) {

webrtc/TwccContext.h

@@ -27,7 +27,7 @@ public:
     TwccContext() = default;
     ~TwccContext() = default;
 
-    void onRtp(uint32_t ssrc, uint16_t twcc_ext_seq);
+    void onRtp(uint32_t ssrc, uint16_t twcc_ext_seq, uint64_t stamp_ms);
     void setOnSendTwccCB(onSendTwccCB cb);
 
 private:
@@ -37,7 +37,6 @@ private:
     void clearStatus();
 
 private:
-    Ticker _ticker;
     uint64_t _min_stamp = 0;
     uint64_t _max_stamp;
     std::map<uint32_t /*twcc_ext_seq*/, uint64_t/*recv time in ms*/> _rtp_recv_status;

webrtc/WebRtcTransport.cpp

@@ -267,7 +267,7 @@ void WebRtcTransport::inputSockData(char *buf, int len, RTC::TransportTuple *tup
             return;
         }
         if (_srtp_session_recv->DecryptSrtp((uint8_t *) buf, &len)) {
-            onRtp(buf, len);
+            onRtp(buf, len, _ticker.createdTime());
         }
         return;
     }
@@ -795,7 +795,7 @@ void WebRtcTransportImp::createRtpChannel(const string &rid, uint32_t ssrc, Medi
     InfoL << "create rtp receiver of ssrc:" << ssrc << ", rid:" << rid << ", codec:" << track.plan_rtp->codec;
 }
 
-void WebRtcTransportImp::onRtp(const char *buf, size_t len) {
+void WebRtcTransportImp::onRtp(const char *buf, size_t len, uint64_t stamp_ms) {
     _bytes_usage += len;
     _alive_ticker.resetTime();
 
@@ -814,7 +814,7 @@ void WebRtcTransportImp::onRtp(const char *buf, size_t len) {
     string rid;
     auto twcc_ext = track->rtp_ext_ctx->changeRtpExtId(rtp, true, &rid, RtpExtType::transport_cc);
     if (twcc_ext && !is_rtx) {
-        _twcc_ctx.onRtp(ssrc, twcc_ext.getTransportCCSeq());
+        _twcc_ctx.onRtp(ssrc, twcc_ext.getTransportCCSeq(), stamp_ms);
     }
 
     auto &ref = track->rtp_channel[rid];

webrtc/WebRtcTransport.h

@@ -109,7 +109,7 @@ protected:
     virtual void onCheckSdp(SdpType type, RtcSession &sdp);
     virtual void onSendSockData(const char *buf, size_t len, struct sockaddr_in *dst, bool flush = true) = 0;
 
-    virtual void onRtp(const char *buf, size_t len) = 0;
+    virtual void onRtp(const char *buf, size_t len, uint64_t stamp_ms) = 0;
     virtual void onRtcp(const char *buf, size_t len) = 0;
     virtual void onShutdown(const SockException &ex) = 0;
     virtual void onBeforeEncryptRtp(const char *buf, int &len, void *ctx) = 0;
@@ -135,6 +135,7 @@ private:
     std::shared_ptr<RTC::SrtpSession> _srtp_session_recv;
     RtcSession::Ptr _offer_sdp;
     RtcSession::Ptr _answer_sdp;
+    Ticker _ticker;
 };
 
 class RtpChannel;
@@ -187,7 +188,7 @@ protected:
     void onCheckSdp(SdpType type, RtcSession &sdp) override;
     void onRtcConfigure(RtcConfigure &configure) const override;
 
-    void onRtp(const char *buf, size_t len) override;
+    void onRtp(const char *buf, size_t len, uint64_t stamp_ms) override;
     void onRtcp(const char *buf, size_t len) override;
     void onBeforeEncryptRtp(const char *buf, int &len, void *ctx) override;
     void onBeforeEncryptRtcp(const char *buf, int &len, void *ctx) override {};