重写webrtc sdp校验逻辑,确保无有效track时抛异常:#1157

webrtc/Sdp.h

@@ -641,8 +641,6 @@ public:
     uint32_t sctp_port{0};
 
     void checkValid() const;
-    //offer sdp,如果指定了发送rtp,那么应该指定ssrc
-    void checkValidSSRC() const;
     const RtcCodecPlan *getPlan(uint8_t pt) const;
     const RtcCodecPlan *getPlan(const char *codec) const;
     const RtcCodecPlan *getRelatedRtxPlan(uint8_t pt) const;
@@ -651,7 +649,7 @@ public:
     bool supportSimulcast() const;
 };
 
-class RtcSession{
+class RtcSession {
 public:
     using Ptr = std::shared_ptr<RtcSession>;
 
@@ -666,15 +664,11 @@ public:
     vector<RtcMedia> media;
     SdpAttrGroup group;
 
-    void loadFrom(const string &sdp, bool check = true);
+    void loadFrom(const string &sdp);
     void checkValid() const;
-    void checkSdp() const;
-    //offer sdp,如果指定了发送rtp,那么应该指定ssrc
-    void checkValidSSRC() const;
     string toString() const;
     string toRtspSdp() const;
     const  RtcMedia *getMedia(TrackType type) const;
-    bool haveSSRC() const;
     bool supportRtcpFb(const string &name, TrackType type = TrackType::TrackVideo) const;
     bool supportSimulcast() const;
 

webrtc/WebRtcTransport.cpp

@@ -187,6 +187,7 @@ std::string WebRtcTransport::getAnswerSdp(const string &offer){
         _offer_sdp = std::make_shared<RtcSession>();
         _offer_sdp->loadFrom(offer);
         onCheckSdp(SdpType::offer, *_offer_sdp);
+        _offer_sdp->checkValid();
         setRemoteDtlsFingerprint(*_offer_sdp);
 
         //// sdp 配置 ////
@@ -201,6 +202,7 @@ std::string WebRtcTransport::getAnswerSdp(const string &offer){
         //// 生成answer sdp ////
         _answer_sdp = configure.createAnswer(*_offer_sdp);
         onCheckSdp(SdpType::answer, *_answer_sdp);
+        _answer_sdp->checkValid();
         return _answer_sdp->toString();
     } catch (exception &ex) {
         onShutdown(SockException(Err_shutdown, ex.what()));
@@ -457,10 +459,9 @@ void WebRtcTransportImp::onCheckAnswer(RtcSession &sdp) {
 }
 
 void WebRtcTransportImp::onCheckSdp(SdpType type, RtcSession &sdp) {
-    sdp.checkSdp();
     switch (type) {
         case SdpType::answer: onCheckAnswer(sdp); break;
-        case SdpType::offer: sdp.checkValidSSRC(); break;
+        case SdpType::offer: break;
         default: /*不可达*/ assert(0); break;
     }
 }