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diff --git a/media/ffvpx/libavcodec/x86/vp56_arith.h b/media/ffvpx/libavcodec/x86/vp56_arith.h
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+++ b/media/ffvpx/libavcodec/x86/vp56_arith.h
@@ -0,0 +1,53 @@
+/**
+ * VP5 and VP6 compatible video decoder (arith decoder)
+ *
+ * Copyright (C) 2006  Aurelien Jacobs <aurel@gnuage.org>
+ * Copyright (C) 2010  Eli Friedman
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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.
+ *
+ * FFmpeg 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVCODEC_X86_VP56_ARITH_H
+#define AVCODEC_X86_VP56_ARITH_H
+
+#if HAVE_INLINE_ASM && HAVE_FAST_CMOV && HAVE_6REGS
+#include "libavutil/attributes.h"
+
+#define vp56_rac_get_prob vp56_rac_get_prob
+static av_always_inline int vp56_rac_get_prob(VP56RangeCoder *c, uint8_t prob)
+{
+    unsigned int code_word = vp56_rac_renorm(c);
+    unsigned int low = 1 + (((c->high - 1) * prob) >> 8);
+    unsigned int low_shift = low << 16;
+    int bit = 0;
+    c->code_word = code_word;
+
+    __asm__(
+        "subl  %4, %1      \n\t"
+        "subl  %3, %2      \n\t"
+        "setae %b0         \n\t"
+        "cmovb %4, %1      \n\t"
+        "cmovb %5, %2      \n\t"
+        : "+q"(bit), "+&r"(c->high), "+&r"(c->code_word)
+        : "r"(low_shift), "r"(low), "r"(code_word)
+    );
+
+    return bit;
+}
+#endif
+
+#endif /* AVCODEC_X86_VP56_ARITH_H */