diff --git a/trunk/configure b/trunk/configure
index b1313d8c0..ec7220d6b 100755
--- a/trunk/configure
+++ b/trunk/configure
@@ -200,7 +200,7 @@ MODULE_ID="CORE"
 MODULE_DEPENDS=()
 ModuleLibIncs=(${SRS_OBJS_DIR})
 MODULE_FILES=("srs_core" "srs_core_version5" "srs_core_autofree" "srs_core_performance"
-		"srs_core_time")
+		"srs_core_time" "srs_core_platform")
 CORE_INCS="src/core"; MODULE_DIR=${CORE_INCS} . auto/modules.sh
 CORE_OBJS="${MODULE_OBJS[@]}"
 #
diff --git a/trunk/src/core/srs_core.hpp b/trunk/src/core/srs_core.hpp
index e40b9c098..d8c1aeeb1 100644
--- a/trunk/src/core/srs_core.hpp
+++ b/trunk/src/core/srs_core.hpp
@@ -32,34 +32,8 @@
 #define VERSION_STABLE 4
 #define VERSION_STABLE_BRANCH SRS_XSTR(VERSION_STABLE) ".0release"
 
-// For 32bit os, 2G big file limit for unistd io,
-// ie. read/write/lseek to use 64bits size for huge file.
-#ifndef _FILE_OFFSET_BITS
-    #define _FILE_OFFSET_BITS 64
-#endif
-
-// For int64_t print using PRId64 format.
-#ifndef __STDC_FORMAT_MACROS
-    #define __STDC_FORMAT_MACROS
-#endif
-
-// For RTC/FFMPEG build.
-#if defined(SRS_RTC) && !defined(__STDC_CONSTANT_MACROS)
-    #define __STDC_CONSTANT_MACROS
-#endif
-
-// For srs-librtmp, @see https://github.com/ossrs/srs/issues/213
-#ifndef _WIN32
-#include <inttypes.h>
-#endif
-
-#include <assert.h>
-#ifndef srs_assert
-#define srs_assert(expression) assert(expression)
-#endif
-
-#include <stddef.h>
-#include <sys/types.h>
+// For platform specified headers and defines.
+#include <srs_core_platform.hpp>
 
 // The time unit for timeout, interval or duration.
 #include <srs_core_time.hpp>
diff --git a/trunk/src/core/srs_core_platform.cpp b/trunk/src/core/srs_core_platform.cpp
new file mode 100644
index 000000000..1da0af075
--- /dev/null
+++ b/trunk/src/core/srs_core_platform.cpp
@@ -0,0 +1,8 @@
+//
+// Copyright (c) 2013-2021 The SRS Authors
+//
+// SPDX-License-Identifier: MIT
+//
+
+#include <srs_core_platform.hpp>
+
diff --git a/trunk/src/core/srs_core_platform.hpp b/trunk/src/core/srs_core_platform.hpp
new file mode 100644
index 000000000..c55f8e452
--- /dev/null
+++ b/trunk/src/core/srs_core_platform.hpp
@@ -0,0 +1,45 @@
+//
+// Copyright (c) 2013-2021 The SRS Authors
+//
+// SPDX-License-Identifier: MIT
+//
+
+#ifndef SRS_CORE_PLATFORM_HPP
+#define SRS_CORE_PLATFORM_HPP
+
+// For 32bit os, 2G big file limit for unistd io,
+// ie. read/write/lseek to use 64bits size for huge file.
+#ifndef _FILE_OFFSET_BITS
+#define _FILE_OFFSET_BITS 64
+#endif
+
+// For int64_t print using PRId64 format.
+#ifndef __STDC_FORMAT_MACROS
+#define __STDC_FORMAT_MACROS
+#endif
+
+// For RTC/FFMPEG build.
+#if defined(SRS_RTC) && !defined(__STDC_CONSTANT_MACROS)
+#define __STDC_CONSTANT_MACROS
+#endif
+
+// For srs-librtmp, @see https://github.com/ossrs/srs/issues/213
+#ifndef _WIN32
+#include <inttypes.h>
+#endif
+
+#include <assert.h>
+#ifndef srs_assert
+#define srs_assert(expression) assert(expression)
+#endif
+
+#include <stddef.h>
+#include <sys/types.h>
+
+// For CentOS 6 or C++98, @see https://github.com/ossrs/srs/issues/2815
+#ifndef UINT32_MAX
+#define UINT32_MAX (4294967295U)
+#endif
+
+#endif
+
diff --git a/trunk/src/kernel/srs_kernel_mp4.cpp b/trunk/src/kernel/srs_kernel_mp4.cpp
index b9c35f441..14db2c730 100644
--- a/trunk/src/kernel/srs_kernel_mp4.cpp
+++ b/trunk/src/kernel/srs_kernel_mp4.cpp
@@ -19,11 +19,6 @@
 #include <iomanip>
 using namespace std;
 
-// For CentOS 6 or C++98, @see https://github.com/ossrs/srs/issues/2815
-#ifndef UINT32_MAX
-#define UINT32_MAX (4294967295U)
-#endif
-
 #define SRS_MP4_EOF_SIZE 0
 #define SRS_MP4_USE_LARGE_SIZE 1