diff --git a/trunk/src/utest/srs_utest_amf0.cpp b/trunk/src/utest/srs_utest_amf0.cpp
index 4b65e13c4..b3ef54212 100644
--- a/trunk/src/utest/srs_utest_amf0.cpp
+++ b/trunk/src/utest/srs_utest_amf0.cpp
@@ -1323,7 +1323,7 @@ VOID TEST(ProtocolAMF0Test, InterfacesString)
     }
 
     if (true) {
-        SrsBuffer b;
+        SrsBuffer b(NULL, 0);
         SrsAmf0Any* o = SrsAmf0Any::str();
         HELPER_EXPECT_FAILED(o->write(&b));
         srs_freep(o);
@@ -1354,7 +1354,7 @@ VOID TEST(ProtocolAMF0Test, InterfacesString)
     }
 
     if (true) {
-        SrsBuffer b;
+        SrsBuffer b(NULL, 0);
         SrsAmf0Any* o = SrsAmf0Any::str();
         HELPER_EXPECT_FAILED(o->read(&b));
         srs_freep(o);
@@ -1452,7 +1452,7 @@ VOID TEST(ProtocolAMF0Test, InterfacesBoolean)
     }
 
     if (true) {
-        SrsBuffer b;
+        SrsBuffer b(NULL, 0);
         SrsAmf0Any* o = SrsAmf0Any::boolean();
         HELPER_EXPECT_FAILED(o->write(&b));
         srs_freep(o);
@@ -1467,7 +1467,7 @@ VOID TEST(ProtocolAMF0Test, InterfacesBoolean)
     }
 
     if (true) {
-        SrsBuffer b;
+        SrsBuffer b(NULL, 0);
         SrsAmf0Any* o = SrsAmf0Any::boolean();
         HELPER_EXPECT_FAILED(o->read(&b));
         srs_freep(o);
@@ -1549,7 +1549,7 @@ VOID TEST(ProtocolAMF0Test, InterfacesNumber)
     }
 
     if (true) {
-        SrsBuffer b;
+        SrsBuffer b(NULL, 0);
         SrsAmf0Any* o = SrsAmf0Any::number();
         HELPER_EXPECT_FAILED(o->write(&b));
         srs_freep(o);
@@ -1564,7 +1564,7 @@ VOID TEST(ProtocolAMF0Test, InterfacesNumber)
     }
 
     if (true) {
-        SrsBuffer b;
+        SrsBuffer b(NULL, 0);
         SrsAmf0Any* o = SrsAmf0Any::number();
         HELPER_EXPECT_FAILED(o->read(&b));
         srs_freep(o);
@@ -1673,14 +1673,14 @@ VOID TEST(ProtocolAMF0Test, InterfacesNull)
     }
 
     if (true) {
-        SrsBuffer b;
+        SrsBuffer b(NULL, 0);
         SrsAmf0Any* o = SrsAmf0Any::null();
         HELPER_EXPECT_FAILED(o->write(&b));
         srs_freep(o);
     }
 
     if (true) {
-        SrsBuffer b;
+        SrsBuffer b(NULL, 0);
         SrsAmf0Any* o = SrsAmf0Any::null();
         HELPER_EXPECT_FAILED(o->read(&b));
         srs_freep(o);
@@ -1739,14 +1739,14 @@ VOID TEST(ProtocolAMF0Test, InterfacesUndefined)
     }
 
     if (true) {
-        SrsBuffer b;
+        SrsBuffer b(NULL, 0);
         SrsAmf0Any* o = SrsAmf0Any::undefined();
         HELPER_EXPECT_FAILED(o->write(&b));
         srs_freep(o);
     }
 
     if (true) {
-        SrsBuffer b;
+        SrsBuffer b(NULL, 0);
         SrsAmf0Any* o = SrsAmf0Any::undefined();
         HELPER_EXPECT_FAILED(o->read(&b));
         srs_freep(o);
@@ -1811,14 +1811,14 @@ VOID TEST(ProtocolAMF0Test, InterfacesObject)
     }
 
     if (true) {
-        SrsBuffer b;
+        SrsBuffer b(NULL, 0);
         SrsAmf0Object* o = SrsAmf0Any::object();
         HELPER_EXPECT_FAILED(o->read(&b));
         srs_freep(o);
     }
 
     if (true) {
-        SrsBuffer b;
+        SrsBuffer b(NULL, 0);
         SrsAmf0Object* o = SrsAmf0Any::object();
         HELPER_EXPECT_FAILED(o->write(&b));
         srs_freep(o);
@@ -2014,14 +2014,14 @@ VOID TEST(ProtocolAMF0Test, InterfacesObjectEOF)
     }
 
     if (true) {
-        SrsBuffer b;
+        SrsBuffer b(NULL, 0);
         SrsAmf0ObjectEOF* o = new SrsAmf0ObjectEOF();
         HELPER_EXPECT_FAILED(o->read(&b));
         srs_freep(o);
     }
 
     if (true) {
-        SrsBuffer b;
+        SrsBuffer b(NULL, 0);
         SrsAmf0ObjectEOF* o = new SrsAmf0ObjectEOF();
         HELPER_EXPECT_FAILED(o->write(&b));
         srs_freep(o);
@@ -2106,14 +2106,14 @@ VOID TEST(ProtocolAMF0Test, InterfacesEcmaArray)
     }
 
     if (true) {
-        SrsBuffer b;
+        SrsBuffer b(NULL, 0);
         SrsAmf0EcmaArray* o = SrsAmf0Any::ecma_array();
         HELPER_EXPECT_FAILED(o->read(&b));
         srs_freep(o);
     }
 
     if (true) {
-        SrsBuffer b;
+        SrsBuffer b(NULL, 0);
         SrsAmf0EcmaArray* o = SrsAmf0Any::ecma_array();
         HELPER_EXPECT_FAILED(o->write(&b));
         srs_freep(o);
@@ -2233,14 +2233,14 @@ VOID TEST(ProtocolAMF0Test, InterfacesStrictArray)
     }
 
     if (true) {
-        SrsBuffer b;
+        SrsBuffer b(NULL, 0);
         SrsAmf0StrictArray* o = SrsAmf0Any::strict_array();
         HELPER_EXPECT_FAILED(o->read(&b));
         srs_freep(o);
     }
 
     if (true) {
-        SrsBuffer b;
+        SrsBuffer b(NULL, 0);
         SrsAmf0StrictArray* o = SrsAmf0Any::strict_array();
         HELPER_EXPECT_FAILED(o->write(&b));
         srs_freep(o);
@@ -2346,7 +2346,7 @@ VOID TEST(ProtocolAMF0Test, InterfacesError)
     srs_error_t err;
 
     if (true) {
-        SrsBuffer b;
+        SrsBuffer b(NULL, 0);
         HELPER_EXPECT_FAILED(SrsAmf0Any::discovery(&b, NULL));
     }
 
@@ -2490,7 +2490,7 @@ VOID TEST(ProtocolAMF0Test, Amf0Object2)
     }
 
     if (true) {
-        SrsBuffer b;
+        SrsBuffer b(NULL, 0);
         SrsAmf0Any* eof = SrsAmf0Any::object_eof();
         HELPER_EXPECT_FAILED(srs_amf0_write_object_eof(&b, (SrsAmf0ObjectEOF*)eof));
         srs_freep(eof);
diff --git a/trunk/src/utest/srs_utest_kernel.cpp b/trunk/src/utest/srs_utest_kernel.cpp
index e7cd4d506..b99a0e3b2 100644
--- a/trunk/src/utest/srs_utest_kernel.cpp
+++ b/trunk/src/utest/srs_utest_kernel.cpp
@@ -2596,7 +2596,7 @@ VOID TEST(KernelUtility, AnnexbUtils)
     if (true) {
         EXPECT_TRUE(!srs_avc_startswith_annexb(NULL, NULL));
         
-        SrsBuffer buf;
+        SrsBuffer buf(NULL, 0);
         EXPECT_TRUE(!srs_avc_startswith_annexb(&buf, NULL));
     }
     
@@ -2654,7 +2654,7 @@ VOID TEST(KernelUtility, AdtsUtils)
     if (true) {
         EXPECT_TRUE(!srs_aac_startswith_adts(NULL));
         
-        SrsBuffer buf;
+        SrsBuffer buf(NULL, 0);
         EXPECT_TRUE(!srs_aac_startswith_adts(&buf));
     }
     
@@ -4506,7 +4506,7 @@ VOID TEST(KernelTSTest, CoverContextUtility)
         SrsTsMessage m(&c, &p);
         
         m.PES_packet_length = 8;
-        SrsBuffer b;
+        SrsBuffer b(NULL, 0);
         
         int nb_bytes = 0;
         HELPER_EXPECT_SUCCESS(m.dump(&b, &nb_bytes));
@@ -4625,7 +4625,7 @@ VOID TEST(KernelTSTest, CoverContextEncode)
     MockTsHandler h;
     
     if (true) {
-        SrsBuffer b;
+        SrsBuffer b(NULL, 0);
         HELPER_EXPECT_SUCCESS(ctx.decode(&b, &h));
         EXPECT_TRUE(NULL == h.msg);
     }
diff --git a/trunk/src/utest/srs_utest_mp4.cpp b/trunk/src/utest/srs_utest_mp4.cpp
index 8779f8672..bf32ccb67 100644
--- a/trunk/src/utest/srs_utest_mp4.cpp
+++ b/trunk/src/utest/srs_utest_mp4.cpp
@@ -220,7 +220,7 @@ VOID TEST(KernelMp4Test, DiscoveryBox)
     SrsMp4Box* pbox;
 
     if (true) {
-        SrsBuffer b;
+        SrsBuffer b(NULL, 0);
         HELPER_ASSERT_FAILED(SrsMp4Box::discovery(&b, &pbox));
     }
 
@@ -419,7 +419,7 @@ VOID TEST(KernelMp4Test, UUIDBoxDecode)
     }
 
     if (true) {
-        SrsBuffer b;
+        SrsBuffer b(NULL, 0);
         SrsMp4Box box;
         HELPER_ASSERT_FAILED(box.decode(&b));
     }
diff --git a/trunk/src/utest/srs_utest_rtmp.cpp b/trunk/src/utest/srs_utest_rtmp.cpp
index a365673c1..b9a279617 100644
--- a/trunk/src/utest/srs_utest_rtmp.cpp
+++ b/trunk/src/utest/srs_utest_rtmp.cpp
@@ -92,7 +92,7 @@ VOID TEST(ProtocolRTMPTest, PacketEncode)
         MockPacket pkt;
         pkt.size = 1024;
 
-        SrsBuffer b;
+        SrsBuffer b(NULL, 0);
         HELPER_EXPECT_FAILED(pkt.decode(&b));
     }