添加获取类型方法

webrtc/RtpExt.cpp

@@ -558,3 +558,7 @@ void RtpExt::clearExt(){
 void RtpExt::setType(RtpExtType type) {
     _type = type;
 }
+
+RtpExtType RtpExt::getType() const {
+    return _type;
+}

webrtc/RtpExt.h

@@ -59,6 +59,7 @@ public:
     static const char *getExtName(RtpExtType type);
 
     void setType(RtpExtType type);
+    RtpExtType getType() const;
     string dumpString() const;
 
     uint8_t getAudioLevel(bool *vad) const;