diff --git a/trunk/src/kernel/srs_kernel_rtc_rtp.cpp b/trunk/src/kernel/srs_kernel_rtc_rtp.cpp
index 76d651da9..488fccea7 100644
--- a/trunk/src/kernel/srs_kernel_rtc_rtp.cpp
+++ b/trunk/src/kernel/srs_kernel_rtc_rtp.cpp
@@ -218,6 +218,13 @@ void SrsRtpExtensionTwcc::reset()
     sn_ = 0;
 }
 
+void SrsRtpExtensionTwcc::assign(const SrsRtpExtensionTwcc& h)
+{
+    has_twcc_ = h.has_twcc_;
+    id_ = h.id_;
+    sn_ = h.sn_;
+}
+
 bool SrsRtpExtensionTwcc::has_twcc_ext()
 {
     return has_twcc_;
@@ -311,6 +318,13 @@ void SrsRtpExtensionOneByte::reset()
     value_ = 0;
 }
 
+void SrsRtpExtensionOneByte::assign(const SrsRtpExtensionOneByte& h)
+{
+    has_ext_ = h.has_ext_;
+    id_ = h.id_;
+    value_ = h.value_;
+}
+
 void SrsRtpExtensionOneByte::set_id(int id)
 {
     id_ = id;
@@ -370,10 +384,21 @@ SrsRtpExtensions::~SrsRtpExtensions()
 
 void SrsRtpExtensions::reset()
 {
-    has_ext_ = false;
     types_ = NULL;
     twcc_.reset();
     audio_level_.reset();
+    has_ext_ = false;
+}
+
+void SrsRtpExtensions::assign(const SrsRtpExtensions& h)
+{
+    has_ext_ = h.has_ext_;
+    types_ = h.types_;
+
+    if (has_ext_) {
+        twcc_.assign(h.twcc_);
+        audio_level_.assign(h.audio_level_);
+    }
 }
 
 srs_error_t SrsRtpExtensions::decode(SrsBuffer* buf)
@@ -583,6 +608,27 @@ void SrsRtpHeader::reset()
     //memset(csrc, 0, sizeof(csrc));
 }
 
+void SrsRtpHeader::assign(const SrsRtpHeader& h)
+{
+    // Reset the fields in protocol.
+    cc               = h.cc;
+    marker           = h.marker;
+    payload_type     = h.payload_type;
+    sequence         = h.sequence;
+    timestamp        = h.timestamp;
+    ssrc             = h.ssrc;
+
+    // Reset the parsed fields.
+    padding_length   = h.padding_length;
+    extensions_.assign(h.extensions_);
+
+    // Reset other fields.
+    ignore_padding_  = h.ignore_padding_;
+
+    // The CSRC is not used yet, so we never reset it.
+    //memcpy(csrc, h.csrc, sizeof(csrc));
+}
+
 srs_error_t SrsRtpHeader::decode(SrsBuffer* buf)
 {
     srs_error_t err = srs_success;
@@ -948,7 +994,7 @@ SrsRtpPacket2* SrsRtpPacket2::copy()
         cp->recycle_shared_msg();
     }
 
-    cp->header = header;
+    cp->header.assign(header);
     cp->payload_ = payload_? payload_->copy():NULL;
     cp->payload_type_ = payload_type_;
 
diff --git a/trunk/src/kernel/srs_kernel_rtc_rtp.hpp b/trunk/src/kernel/srs_kernel_rtc_rtp.hpp
index 34baa77e2..4503a73e6 100644
--- a/trunk/src/kernel/srs_kernel_rtc_rtp.hpp
+++ b/trunk/src/kernel/srs_kernel_rtc_rtp.hpp
@@ -140,14 +140,14 @@ public:
 public:
     // Reset the object to reuse it.
     void reset();
-
+    void assign(const SrsRtpExtensionTwcc& h);
+public:
     bool has_twcc_ext();
     uint8_t get_id();
     void set_id(uint8_t id);
     uint16_t get_sn();
     void set_sn(uint16_t sn);
-
-public:  
+public:
     // ISrsCodec
     virtual srs_error_t decode(SrsBuffer* buf);
     virtual srs_error_t encode(SrsBuffer* buf);
@@ -166,7 +166,8 @@ public:
 public:
     // Reset the object to reuse it.
     void reset();
-
+    void assign(const SrsRtpExtensionOneByte& h);
+public:
     bool exists() { return has_ext_; }
     int get_id() { return id_; }
     uint8_t get_value() { return value_; }
@@ -197,6 +198,7 @@ public:
 public:
     // Reset the object to reuse it.
     void reset();
+    void assign(const SrsRtpExtensions& h);
 public:
     bool exists();
     void set_types_(SrsRtpExtensionTypes* types);
@@ -234,6 +236,7 @@ public:
 public:
     // Reset the object to reuse it.
     void reset();
+    void assign(const SrsRtpHeader& h);
 public:
     virtual srs_error_t decode(SrsBuffer* buf);
 private: