diff --git a/trunk/src/app/srs_app_rtc_queue.cpp b/trunk/src/app/srs_app_rtc_queue.cpp
index ddce2ebea..c638b5129 100644
--- a/trunk/src/app/srs_app_rtc_queue.cpp
+++ b/trunk/src/app/srs_app_rtc_queue.cpp
@@ -183,10 +183,6 @@ SrsRtpNackInfo::SrsRtpNackInfo()
     req_nack_count_ = 0;
 }
 
-bool SrsRtpNackForReceiver::SeqComp::operator()(const uint16_t& pre_value, const uint16_t& value) const {
-    return srs_rtp_seq_distance(pre_value, value) > 0;
-}
-
 SrsRtpNackForReceiver::SrsRtpNackForReceiver(SrsRtpRingBuffer* rtp, size_t queue_size)
 {
     max_queue_size_ = queue_size;
diff --git a/trunk/src/app/srs_app_rtc_queue.hpp b/trunk/src/app/srs_app_rtc_queue.hpp
index 9bbada3ce..3b04d17d7 100644
--- a/trunk/src/app/srs_app_rtc_queue.hpp
+++ b/trunk/src/app/srs_app_rtc_queue.hpp
@@ -30,6 +30,8 @@
 #include <vector>
 #include <map>
 
+#include <srs_kernel_rtc_rtp.hpp>
+
 class SrsRtpPacket2;
 class SrsRtpQueue;
 class SrsRtpRingBuffer;
@@ -111,13 +113,9 @@ struct SrsRtpNackInfo
 
 class SrsRtpNackForReceiver
 {
-private:
-    struct SeqComp {
-        bool operator()(const uint16_t& pre_value, const uint16_t& value) const;
-    };
 private:
     // Nack queue, seq order, oldest to newest.
-    std::map<uint16_t, SrsRtpNackInfo, SeqComp> queue_;
+    std::map<uint16_t, SrsRtpNackInfo, SrsSeqCompareLess> queue_;
     // Max nack count.
     size_t max_queue_size_;
     SrsRtpRingBuffer* rtp_;
diff --git a/trunk/src/kernel/srs_kernel_rtc_rtcp.cpp b/trunk/src/kernel/srs_kernel_rtc_rtcp.cpp
index f6953126b..41ba9fd76 100644
--- a/trunk/src/kernel/srs_kernel_rtc_rtcp.cpp
+++ b/trunk/src/kernel/srs_kernel_rtc_rtcp.cpp
@@ -36,6 +36,11 @@ SrsRtcpCommon::~SrsRtcpCommon()
 { 
 }
 
+const uint8_t SrsRtcpCommon::type() const
+{
+    return header_.type;
+}
+
 srs_error_t SrsRtcpCommon::decode_header(SrsBuffer *buffer)
 {
     buffer->read_bytes((char*)(&header_), sizeof(SrsRtcpHeader));
@@ -84,6 +89,11 @@ SrsRtcpApp::~SrsRtcpApp()
 {
 }
 
+const uint8_t SrsRtcpApp::type() const
+{
+    return SrsRtcpType_app;
+}
+
 const uint32_t SrsRtcpApp::get_ssrc() const
 {
     return ssrc_;
@@ -200,7 +210,16 @@ SrsRtcpSR::SrsRtcpSR()
 
 SrsRtcpSR::~SrsRtcpSR()
 {
+}
 
+const uint8_t SrsRtcpSR::get_rc() const
+{
+    return header_.rc;
+}
+
+const uint8_t SrsRtcpSR::type() const
+{
+    return SrsRtcpType_sr;
 }
 
 const uint32_t SrsRtcpSR::get_sender_ssrc() const
@@ -314,6 +333,11 @@ SrsRtcpRR::~SrsRtcpRR()
 {
 }
 
+const uint8_t SrsRtcpRR::type() const
+{
+    return SrsRtcpType_rr;
+}
+
 const uint32_t SrsRtcpRR::get_rb_ssrc() const
 {
     return rb_.ssrc;
diff --git a/trunk/src/kernel/srs_kernel_rtc_rtcp.hpp b/trunk/src/kernel/srs_kernel_rtc_rtcp.hpp
index d12308702..25ceb13f9 100644
--- a/trunk/src/kernel/srs_kernel_rtc_rtcp.hpp
+++ b/trunk/src/kernel/srs_kernel_rtc_rtcp.hpp
@@ -26,17 +26,19 @@
 
 #include <srs_core.hpp>
 
-#include <srs_kernel_buffer.hpp>
-#include <srs_kernel_rtc_rtp.hpp>
 #include <vector>
 #include <set>
 #include <map>
 
+#include <srs_kernel_buffer.hpp>
+#include <srs_kernel_rtc_rtp.hpp>
+
 const int kRtcpPacketSize = 1500;
 const uint8_t kRtcpVersion = 0x2;
 
 // RTCP Packet Types, @see http://www.networksorcery.com/enp/protocol/rtcp.htm
-enum SrsRtcpType {
+enum SrsRtcpType
+{
     SrsRtcpType_fir = 192,
     SrsRtcpType_sr = 200,
     SrsRtcpType_rr = 201,
@@ -59,12 +61,6 @@ struct SrsRtcpHeader
 	uint16_t length:16;
 };
 
-struct SrsSeqCompareLess {
-    bool operator()(const uint16_t &lhs, const uint16_t &rhs) const {
-        return srs_seq_is_newer(rhs, lhs);
-    }
-};
-
 class SrsRtcpCommon: public ISrsCodec
 {
 protected:
@@ -78,7 +74,7 @@ protected:
 public:
     SrsRtcpCommon();
     virtual ~SrsRtcpCommon();
-    virtual const uint8_t type() const { return header_.type; }
+    virtual const uint8_t type() const;
 
 public:
     // ISrsCodec
@@ -98,7 +94,7 @@ public:
     SrsRtcpApp();
     virtual ~SrsRtcpApp();
 
-    virtual const uint8_t type() const { return SrsRtcpType_app; }
+    virtual const uint8_t type() const;
     
     const uint32_t get_ssrc() const;
     const uint8_t get_subtype() const;
@@ -116,7 +112,8 @@ public:
     virtual srs_error_t encode(SrsBuffer *buffer);
 };
 
-struct srs_rtcp_rb_t {
+struct SrsRtcpRB
+{
     uint32_t ssrc;
     uint8_t fraction_lost;
     uint32_t lost_packets;
@@ -138,9 +135,9 @@ public:
     SrsRtcpSR();
     virtual ~SrsRtcpSR();
 
-    const uint8_t get_rc() const { return header_.rc; }
+    const uint8_t get_rc() const;
     // overload SrsRtcpCommon
-    virtual const uint8_t type() const { return SrsRtcpType_sr; }
+    virtual const uint8_t type() const;
     const uint32_t get_sender_ssrc() const;
     const uint64_t get_ntp() const;
     const uint32_t get_rtp_ts() const;
@@ -164,13 +161,13 @@ class SrsRtcpRR : public SrsRtcpCommon
 {
 private:
     uint32_t sender_ssrc_;
-    srs_rtcp_rb_t rb_;
+    SrsRtcpRB rb_;
 public:
     SrsRtcpRR(uint32_t sender_ssrc = 0);
     virtual ~SrsRtcpRR();
 
     // overload SrsRtcpCommon
-    virtual const uint8_t type() const { return SrsRtcpType_rr; }
+    virtual const uint8_t type() const;
 
     const uint32_t get_rb_ssrc() const;
     const float get_lost_rate() const;
diff --git a/trunk/src/kernel/srs_kernel_rtc_rtp.hpp b/trunk/src/kernel/srs_kernel_rtc_rtp.hpp
index 2b09fad5a..ea60fc640 100644
--- a/trunk/src/kernel/srs_kernel_rtc_rtp.hpp
+++ b/trunk/src/kernel/srs_kernel_rtc_rtp.hpp
@@ -71,6 +71,13 @@ inline int16_t srs_rtp_seq_distance(const uint16_t& prev_value, const uint16_t&
     return (int16_t)(value - prev_value);
 }
 
+// For map to compare the sequence of RTP.
+struct SrsSeqCompareLess {
+    bool operator()(const uint16_t& pre_value, const uint16_t& value) const {
+        return srs_rtp_seq_distance(pre_value, value) > 0;
+    }
+};
+
 bool srs_seq_is_newer(uint16_t value, uint16_t pre_value);
 bool srs_seq_is_roolback(uint16_t value, uint16_t pre_value);
 int32_t srs_seq_distance(uint16_t value, uint16_t pre_value);