diff --git a/trunk/src/kernel/srs_kernel_rtc_rtp.cpp b/trunk/src/kernel/srs_kernel_rtc_rtp.cpp
index 072d9bfd4..17f2bf7b3 100644
--- a/trunk/src/kernel/srs_kernel_rtc_rtp.cpp
+++ b/trunk/src/kernel/srs_kernel_rtc_rtp.cpp
@@ -165,18 +165,13 @@ int32_t srs_seq_distance(uint16_t value, uint16_t pre_value)
 
 SrsRtpExtensionTypes::SrsRtpExtensionTypes()
 {
-    reset();
+    memset(ids_, kRtpExtensionNone, sizeof(ids_));
 }
 
 SrsRtpExtensionTypes::~SrsRtpExtensionTypes()
 {
 }
 
-void SrsRtpExtensionTypes::reset()
-{
-    memset(ids_, kRtpExtensionNone, sizeof(ids_));
-}
-
 bool SrsRtpExtensionTypes::register_by_uri(int id, std::string uri)
 {
     for (int i = 0; i < (int)(sizeof(kExtensions)/sizeof(kExtensions[0])); ++i) {
@@ -377,13 +372,10 @@ SrsRtpExtensions::~SrsRtpExtensions()
 
 void SrsRtpExtensions::reset()
 {
-    if (has_ext_) {
-        types_.reset();
-        twcc_.reset();
-        audio_level_.reset();
-    }
-
     has_ext_ = false;
+    types_ = NULL;
+    twcc_.reset();
+    audio_level_.reset();
 }
 
 srs_error_t SrsRtpExtensions::decode(SrsBuffer* buf)
@@ -445,7 +437,7 @@ srs_error_t SrsRtpExtensions::decode_0xbede(SrsBuffer* buf)
         uint8_t id = (v & 0xF0) >> 4;
         uint8_t len = (v & 0x0F);
 
-        SrsRtpExtensionType xtype = types_.get_type(id);
+        SrsRtpExtensionType xtype = types_? types_->get_type(id) : kRtpExtensionNone;
         if (xtype == kRtpExtensionTransportSequenceNumber) {
             if ((err = twcc_.decode(buf)) != srs_success) {
                 return srs_error_wrap(err, "decode twcc extension");
@@ -522,11 +514,9 @@ bool SrsRtpExtensions::exists()
     return has_ext_;
 }
 
-void SrsRtpExtensions::set_types_(const SrsRtpExtensionTypes* types)
+void SrsRtpExtensions::set_types_(SrsRtpExtensionTypes* types)
 {
-    if(types) {
-        types_ = *types;
-    }
+    types_ = types;
 }
 
 srs_error_t SrsRtpExtensions::get_twcc_sequence_number(uint16_t& twcc_sn)
@@ -703,7 +693,7 @@ srs_error_t SrsRtpHeader::encode(SrsBuffer* buf)
 
     return err;
 }
-void SrsRtpHeader::set_extensions(const SrsRtpExtensionTypes* extmap)
+void SrsRtpHeader::set_extensions(SrsRtpExtensionTypes* extmap)
 {
     if (extmap) {
         extensions_.set_types_(extmap);
@@ -992,7 +982,7 @@ bool SrsRtpPacket2::is_audio()
     return frame_type == SrsFrameTypeAudio;
 }
 
-void SrsRtpPacket2::set_extension_types(const SrsRtpExtensionTypes* v)
+void SrsRtpPacket2::set_extension_types(SrsRtpExtensionTypes* v)
 {
     return header.set_extensions(v);
 }
diff --git a/trunk/src/kernel/srs_kernel_rtc_rtp.hpp b/trunk/src/kernel/srs_kernel_rtc_rtp.hpp
index e3fb55eb6..34baa77e2 100644
--- a/trunk/src/kernel/srs_kernel_rtc_rtp.hpp
+++ b/trunk/src/kernel/srs_kernel_rtc_rtp.hpp
@@ -122,9 +122,6 @@ public:
 public:
     SrsRtpExtensionTypes();
     virtual ~SrsRtpExtensionTypes();
-public:
-    // Reset the object to reuse it.
-    void reset();
 private:
     bool register_id(int id, SrsRtpExtensionType type, std::string uri);
 private:
@@ -187,7 +184,11 @@ class SrsRtpExtensions// : public ISrsCodec
 {
 private:
     bool has_ext_;
-    SrsRtpExtensionTypes types_;
+private:
+    // The extension types is used to decode the packet, which is reference to
+    // the types in publish stream.
+    SrsRtpExtensionTypes* types_;
+private:
     SrsRtpExtensionTwcc twcc_;
     SrsRtpExtensionOneByte audio_level_;
 public:
@@ -198,7 +199,7 @@ public:
     void reset();
 public:
     bool exists();
-    void set_types_(const SrsRtpExtensionTypes* types);
+    void set_types_(SrsRtpExtensionTypes* types);
     srs_error_t get_twcc_sequence_number(uint16_t& twcc_sn);
     srs_error_t set_twcc_sequence_number(uint8_t id, uint16_t sn);
     srs_error_t get_audio_level(uint8_t& level);
@@ -256,7 +257,7 @@ public:
     }
     void set_padding(uint8_t v);
     uint8_t get_padding() const;
-    void set_extensions(const SrsRtpExtensionTypes* extmap);
+    void set_extensions(SrsRtpExtensionTypes* extmap);
     void ignore_padding(bool v);
     srs_error_t get_twcc_sequence_number(uint16_t& twcc_sn);
     srs_error_t set_twcc_sequence_number(uint8_t id, uint16_t sn);
@@ -346,7 +347,7 @@ public:
     // Whether the packet is Audio packet.
     bool is_audio();
     // Set RTP header extensions for encoding or decoding header extension
-    void set_extension_types(const SrsRtpExtensionTypes* v);
+    void set_extension_types(SrsRtpExtensionTypes* v);
 // interface ISrsEncoder
 public:
     virtual uint64_t nb_bytes();