diff --git a/libavcodec/x86/cavsdsp.c b/libavcodec/x86/cavsdsp.c
index 1e33aa4375..38235f0a48 100644
--- a/libavcodec/x86/cavsdsp.c
+++ b/libavcodec/x86/cavsdsp.c
@@ -28,6 +28,7 @@
 #include "libavutil/x86/asm.h"
 #include "libavutil/x86/cpu.h"
 #include "libavcodec/cavsdsp.h"
+#include "constants.h"
 #include "dsputil_mmx.h"
 #include "config.h"
 
diff --git a/libavcodec/x86/constants.c b/libavcodec/x86/constants.c
index 5511eed0ae..5b8d1b224f 100644
--- a/libavcodec/x86/constants.c
+++ b/libavcodec/x86/constants.c
@@ -20,6 +20,7 @@
 
 #include "libavutil/mem.h"
 #include "libavutil/x86/asm.h" // for xmm_reg
+#include "constants.h"
 
 DECLARE_ALIGNED(8,  const uint64_t, ff_wtwo) = 0x0002000200020002ULL;
 
diff --git a/libavcodec/x86/constants.h b/libavcodec/x86/constants.h
new file mode 100644
index 0000000000..f38fbe3425
--- /dev/null
+++ b/libavcodec/x86/constants.h
@@ -0,0 +1,51 @@
+/*
+ * MMX/SSE constants used across x86 dsp optimizations.
+ *
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVCODEC_X86_CONSTANTS_H
+#define AVCODEC_X86_CONSTANTS_H
+
+#include <stdint.h>
+
+#include "libavutil/x86/asm.h"
+
+extern const uint64_t ff_wtwo;
+
+extern const xmm_reg  ff_pw_3;
+extern const xmm_reg  ff_pw_4;
+extern const xmm_reg  ff_pw_5;
+extern const xmm_reg  ff_pw_8;
+extern const uint64_t ff_pw_15;
+extern const xmm_reg  ff_pw_16;
+extern const xmm_reg  ff_pw_18;
+extern const uint64_t ff_pw_20;
+extern const xmm_reg  ff_pw_32;
+extern const uint64_t ff_pw_42;
+extern const uint64_t ff_pw_53;
+extern const xmm_reg  ff_pw_64;
+extern const uint64_t ff_pw_96;
+extern const uint64_t ff_pw_128;
+extern const uint64_t ff_pw_255;
+
+extern const xmm_reg  ff_pb_1;
+extern const xmm_reg  ff_pb_3;
+extern const xmm_reg  ff_pb_F8;
+extern const uint64_t ff_pb_FC;
+
+#endif /* AVCODEC_X86_CONSTANTS_H */
diff --git a/libavcodec/x86/dsputil_mmx.c b/libavcodec/x86/dsputil_mmx.c
index 3bc05762d4..546cd7524f 100644
--- a/libavcodec/x86/dsputil_mmx.c
+++ b/libavcodec/x86/dsputil_mmx.c
@@ -29,6 +29,7 @@
 #include "libavcodec/h264dsp.h"
 #include "libavcodec/mpegvideo.h"
 #include "libavcodec/simple_idct.h"
+#include "constants.h"
 #include "dsputil_mmx.h"
 #include "idct_xvid.h"
 
diff --git a/libavcodec/x86/dsputil_mmx.h b/libavcodec/x86/dsputil_mmx.h
index 4afa5abb4e..46ff22b54b 100644
--- a/libavcodec/x86/dsputil_mmx.h
+++ b/libavcodec/x86/dsputil_mmx.h
@@ -27,29 +27,7 @@
 
 #include "libavcodec/dsputil.h"
 #include "libavutil/x86/asm.h"
-
-extern const uint64_t ff_wtwo;
-
-extern const xmm_reg  ff_pw_3;
-extern const xmm_reg  ff_pw_4;
-extern const xmm_reg  ff_pw_5;
-extern const xmm_reg  ff_pw_8;
-extern const uint64_t ff_pw_15;
-extern const xmm_reg  ff_pw_16;
-extern const xmm_reg  ff_pw_18;
-extern const uint64_t ff_pw_20;
-extern const xmm_reg  ff_pw_32;
-extern const uint64_t ff_pw_42;
-extern const uint64_t ff_pw_53;
-extern const xmm_reg  ff_pw_64;
-extern const uint64_t ff_pw_96;
-extern const uint64_t ff_pw_128;
-extern const uint64_t ff_pw_255;
-
-extern const xmm_reg  ff_pb_1;
-extern const xmm_reg  ff_pb_3;
-extern const xmm_reg  ff_pb_F8;
-extern const uint64_t ff_pb_FC;
+#include "constants.h"
 
 #define SBUTTERFLY(a,b,t,n,m)\
     "mov" #m " " #a ", " #t "         \n\t" /* abcd */\
diff --git a/libavcodec/x86/vc1dsp_mmx.c b/libavcodec/x86/vc1dsp_mmx.c
index 846590bd2a..5a0877f63f 100644
--- a/libavcodec/x86/vc1dsp_mmx.c
+++ b/libavcodec/x86/vc1dsp_mmx.c
@@ -29,8 +29,9 @@
 #include "libavutil/mem.h"
 #include "libavutil/x86/asm.h"
 #include "libavutil/x86/cpu.h"
-#include "dsputil_mmx.h"
 #include "libavcodec/vc1dsp.h"
+#include "constants.h"
+#include "dsputil_mmx.h"
 #include "vc1dsp.h"
 
 #if HAVE_INLINE_ASM