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diff --git a/media/libav/libavutil/x86/asm.h b/media/libav/libavutil/x86/asm.h
new file mode 100644
index 000000000..e30f5dbaf
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+++ b/media/libav/libavutil/x86/asm.h
@@ -0,0 +1,112 @@
+/*
+ * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * 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 AVUTIL_X86_ASM_H
+#define AVUTIL_X86_ASM_H
+
+#include <stdint.h>
+#include "config.h"
+
+typedef struct xmm_reg { uint64_t a, b; } xmm_reg;
+
+#if ARCH_X86_64
+#    define OPSIZE "q"
+#    define REG_a "rax"
+#    define REG_b "rbx"
+#    define REG_c "rcx"
+#    define REG_d "rdx"
+#    define REG_D "rdi"
+#    define REG_S "rsi"
+#    define PTR_SIZE "8"
+typedef int64_t x86_reg;
+
+#    define REG_SP "rsp"
+#    define REG_BP "rbp"
+#    define REGBP   rbp
+#    define REGa    rax
+#    define REGb    rbx
+#    define REGc    rcx
+#    define REGd    rdx
+#    define REGSP   rsp
+
+#elif ARCH_X86_32
+
+#    define OPSIZE "l"
+#    define REG_a "eax"
+#    define REG_b "ebx"
+#    define REG_c "ecx"
+#    define REG_d "edx"
+#    define REG_D "edi"
+#    define REG_S "esi"
+#    define PTR_SIZE "4"
+typedef int32_t x86_reg;
+
+#    define REG_SP "esp"
+#    define REG_BP "ebp"
+#    define REGBP   ebp
+#    define REGa    eax
+#    define REGb    ebx
+#    define REGc    ecx
+#    define REGd    edx
+#    define REGSP   esp
+#else
+typedef int x86_reg;
+#endif
+
+#define HAVE_7REGS (ARCH_X86_64 || (HAVE_EBX_AVAILABLE && HAVE_EBP_AVAILABLE))
+#define HAVE_6REGS (ARCH_X86_64 || (HAVE_EBX_AVAILABLE || HAVE_EBP_AVAILABLE))
+
+#if ARCH_X86_64 && defined(PIC)
+#    define BROKEN_RELOCATIONS 1
+#endif
+
+/*
+ * If gcc is not set to support sse (-msse) it will not accept xmm registers
+ * in the clobber list for inline asm. XMM_CLOBBERS takes a list of xmm
+ * registers to be marked as clobbered and evaluates to nothing if they are
+ * not supported, or to the list itself if they are supported. Since a clobber
+ * list may not be empty, XMM_CLOBBERS_ONLY should be used if the xmm
+ * registers are the only in the clobber list.
+ * For example a list with "eax" and "xmm0" as clobbers should become:
+ * : XMM_CLOBBERS("xmm0",) "eax"
+ * and a list with only "xmm0" should become:
+ * XMM_CLOBBERS_ONLY("xmm0")
+ */
+#if HAVE_XMM_CLOBBERS
+#    define XMM_CLOBBERS(...)        __VA_ARGS__
+#    define XMM_CLOBBERS_ONLY(...) : __VA_ARGS__
+#else
+#    define XMM_CLOBBERS(...)
+#    define XMM_CLOBBERS_ONLY(...)
+#endif
+
+/* Use to export labels from asm. */
+#define LABEL_MANGLE(a) EXTERN_PREFIX #a
+
+// Use rip-relative addressing if compiling PIC code on x86-64.
+#if ARCH_X86_64 && defined(PIC)
+#    define LOCAL_MANGLE(a) #a "(%%rip)"
+#else
+#    define LOCAL_MANGLE(a) #a
+#endif
+
+#define MANGLE(a) EXTERN_PREFIX LOCAL_MANGLE(a)
+
+#endif /* AVUTIL_X86_ASM_H */