diff --git a/src/Rtsp/Rtsp.cpp b/src/Rtsp/Rtsp.cpp
index 97bf27e1..41f9aae5 100644
--- a/src/Rtsp/Rtsp.cpp
+++ b/src/Rtsp/Rtsp.cpp
@@ -478,7 +478,7 @@ size_t RtpHeader::getPaddingSize(size_t rtp_size) const {
     return *end;
 }
 
-size_t RtpHeader::getPayloadSize(size_t rtp_size){
+size_t RtpHeader::getPayloadSize(size_t rtp_size) const{
     auto invalid_size = getPayloadOffset() + getPaddingSize(rtp_size);
     if (invalid_size + RtpPacket::kRtpHeaderSize >= rtp_size) {
         return 0;
@@ -486,6 +486,25 @@ size_t RtpHeader::getPayloadSize(size_t rtp_size){
     return rtp_size - invalid_size - RtpPacket::kRtpHeaderSize;
 }
 
+string RtpHeader::dumpString(size_t rtp_size) const{
+    _StrPrinter printer;
+    printer << "version:" << (int)version << "\r\n";
+    printer << "padding:" << getPaddingSize(rtp_size) << "\r\n";
+    printer << "ext:" << getExtSize() << "\r\n";
+    printer << "csrc:" << getCsrcSize() << "\r\n";
+    printer << "mark:" << (int)mark << "\r\n";
+    printer << "pt:" << (int)pt << "\r\n";
+    printer << "seq:" << ntohs(seq) << "\r\n";
+    printer << "stamp:" << ntohl(stamp) << "\r\n";
+    printer << "ssrc:" << ntohl(ssrc) << "\r\n";
+    printer << "rtp size:" << rtp_size << "\r\n";
+    printer << "payload offset:" << getPayloadOffset() << "\r\n";
+    printer << "payload size:" << getPayloadSize(rtp_size) << "\r\n";
+    return std::move(printer);
+}
+
+///////////////////////////////////////////////////////////////////////
+
 RtpHeader* RtpPacket::getHeader(){
     //需除去rtcp over tcp 4个字节长度
     return (RtpHeader*)(data() + RtpPacket::kRtpTcpHeaderSize);
diff --git a/src/Rtsp/Rtsp.h b/src/Rtsp/Rtsp.h
index d9ba975d..75dc7141 100644
--- a/src/Rtsp/Rtsp.h
+++ b/src/Rtsp/Rtsp.h
@@ -125,7 +125,9 @@ public:
     //返回有效负载指针,跳过csrc、ext
     uint8_t* getPayloadData();
     //返回有效负载总长度,不包括csrc、ext、padding
-    size_t getPayloadSize(size_t rtp_size);
+    size_t getPayloadSize(size_t rtp_size) const;
+    //打印调试信息
+    string dumpString(size_t rtp_size) const;
 
 private:
     //返回有效负载偏移量