diff --git a/webrtc/SrtpSession.cpp b/webrtc/SrtpSession.cpp
index c4e30240..4b81efad 100644
--- a/webrtc/SrtpSession.cpp
+++ b/webrtc/SrtpSession.cpp
@@ -231,7 +231,7 @@ namespace RTC
 		}
 	}
 
-	bool SrtpSession::EncryptRtp(uint8_t* data, size_t* len)
+	bool SrtpSession::EncryptRtp(uint8_t* data, int* len)
 	{
 		MS_TRACE();
 		srtp_err_status_t err =
@@ -246,7 +246,7 @@ namespace RTC
 		return true;
 	}
 
-	bool SrtpSession::DecryptSrtp(uint8_t* data, size_t* len)
+	bool SrtpSession::DecryptSrtp(uint8_t* data, int* len)
 	{
 		MS_TRACE();
 
@@ -262,7 +262,7 @@ namespace RTC
 		return true;
 	}
 
-	bool SrtpSession::EncryptRtcp(uint8_t* data, size_t* len)
+	bool SrtpSession::EncryptRtcp(uint8_t* data, int* len)
 	{
 		MS_TRACE();
 		srtp_err_status_t err = srtp_protect_rtcp(
@@ -277,7 +277,7 @@ namespace RTC
 		return true;
 	}
 
-	bool SrtpSession::DecryptSrtcp(uint8_t* data, size_t* len)
+	bool SrtpSession::DecryptSrtcp(uint8_t* data, int* len)
 	{
 		MS_TRACE();
 
diff --git a/webrtc/SrtpSession.hpp b/webrtc/SrtpSession.hpp
index a50684e5..69a562f0 100644
--- a/webrtc/SrtpSession.hpp
+++ b/webrtc/SrtpSession.hpp
@@ -64,10 +64,10 @@ namespace RTC
 		~SrtpSession();
 
 	public:
-		bool EncryptRtp(uint8_t* data, size_t* len);
-		bool DecryptSrtp(uint8_t* data, size_t* len);
-		bool EncryptRtcp(uint8_t* data, size_t* len);
-		bool DecryptSrtcp(uint8_t* data, size_t* len);
+		bool EncryptRtp(uint8_t* data, int* len);
+		bool DecryptSrtp(uint8_t* data, int* len);
+		bool EncryptRtcp(uint8_t* data, int* len);
+		bool DecryptSrtcp(uint8_t* data, int* len);
 		void RemoveStream(uint32_t ssrc)
 		{
 			srtp_remove_stream(this->session, uint32_t{ htonl(ssrc) });
diff --git a/webrtc/WebRtcTransport.cpp b/webrtc/WebRtcTransport.cpp
index dde68fc1..cbbb3b72 100644
--- a/webrtc/WebRtcTransport.cpp
+++ b/webrtc/WebRtcTransport.cpp
@@ -236,7 +236,7 @@ bool is_rtcp(char *buf) {
     return ((header->pt >= 64) && (header->pt < 96));
 }
 
-void WebRtcTransport::inputSockData(char *buf, size_t len, RTC::TransportTuple *tuple) {
+void WebRtcTransport::inputSockData(char *buf, int len, RTC::TransportTuple *tuple) {
     if (RTC::StunPacket::IsStun((const uint8_t *) buf, len)) {
         RTC::StunPacket *packet = RTC::StunPacket::Parse((const uint8_t *) buf, len);
         if (packet == nullptr) {
@@ -264,7 +264,7 @@ void WebRtcTransport::inputSockData(char *buf, size_t len, RTC::TransportTuple *
     }
 }
 
-void WebRtcTransport::sendRtpPacket(const char *buf, size_t len, bool flush, void *ctx) {
+void WebRtcTransport::sendRtpPacket(const char *buf, int len, bool flush, void *ctx) {
     if (_srtp_session_send) {
         //预留rtx加入的两个字节
         CHECK(len + SRTP_MAX_TRAILER_LEN + 2 <= sizeof(_srtp_buf));
@@ -276,7 +276,7 @@ void WebRtcTransport::sendRtpPacket(const char *buf, size_t len, bool flush, voi
     }
 }
 
-void WebRtcTransport::sendRtcpPacket(const char *buf, size_t len, bool flush, void *ctx){
+void WebRtcTransport::sendRtcpPacket(const char *buf, int len, bool flush, void *ctx){
     if (_srtp_session_send) {
         CHECK(len + SRTP_MAX_TRAILER_LEN <= sizeof(_srtp_buf));
         memcpy(_srtp_buf, buf, len);
@@ -901,7 +901,7 @@ void WebRtcTransportImp::onSendRtp(const RtpPacket::Ptr &rtp, bool flush, bool r
     _bytes_usage += rtp->size() - RtpPacket::kRtpTcpHeaderSize;
 }
 
-void WebRtcTransportImp::onBeforeEncryptRtp(const char *buf, size_t &len, void *ctx) {
+void WebRtcTransportImp::onBeforeEncryptRtp(const char *buf, int &len, void *ctx) {
     auto pr = (pair<bool/*rtx*/, MediaTrack *> *) ctx;
     auto header = (RtpHeader *) buf;
 
diff --git a/webrtc/WebRtcTransport.h b/webrtc/WebRtcTransport.h
index 30ba2f95..d96a8939 100644
--- a/webrtc/WebRtcTransport.h
+++ b/webrtc/WebRtcTransport.h
@@ -56,7 +56,7 @@ public:
      * @param len 数据长度
      * @param tuple 数据来源
      */
-    void inputSockData(char *buf, size_t len, RTC::TransportTuple *tuple);
+    void inputSockData(char *buf, int len, RTC::TransportTuple *tuple);
 
     /**
      * 发送rtp
@@ -65,8 +65,8 @@ public:
      * @param flush 是否flush socket
      * @param ctx 用户指针
      */
-    void sendRtpPacket(const char *buf, size_t len, bool flush, void *ctx = nullptr);
-    void sendRtcpPacket(const char *buf, size_t len, bool flush, void *ctx = nullptr);
+    void sendRtpPacket(const char *buf, int len, bool flush, void *ctx = nullptr);
+    void sendRtcpPacket(const char *buf, int len, bool flush, void *ctx = nullptr);
 
     const EventPoller::Ptr& getPoller() const;
 
@@ -103,8 +103,8 @@ protected:
     virtual void onRtp(const char *buf, size_t len) = 0;
     virtual void onRtcp(const char *buf, size_t len) = 0;
     virtual void onShutdown(const SockException &ex) = 0;
-    virtual void onBeforeEncryptRtp(const char *buf, size_t &len, void *ctx) = 0;
-    virtual void onBeforeEncryptRtcp(const char *buf, size_t &len, void *ctx) = 0;
+    virtual void onBeforeEncryptRtp(const char *buf, int &len, void *ctx) = 0;
+    virtual void onBeforeEncryptRtcp(const char *buf, int &len, void *ctx) = 0;
 
 protected:
     const RtcSession& getSdp(SdpType type) const;
@@ -176,8 +176,8 @@ protected:
 
     void onRtp(const char *buf, size_t len) override;
     void onRtcp(const char *buf, size_t len) override;
-    void onBeforeEncryptRtp(const char *buf, size_t &len, void *ctx) override;
-    void onBeforeEncryptRtcp(const char *buf, size_t &len, void *ctx) override {};
+    void onBeforeEncryptRtp(const char *buf, int &len, void *ctx) override;
+    void onBeforeEncryptRtcp(const char *buf, int &len, void *ctx) override {};
 
     void onShutdown(const SockException &ex) override;