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diff --git a/third_party/aom/aom_dsp/ans.h b/third_party/aom/aom_dsp/ans.h
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+++ b/third_party/aom/aom_dsp/ans.h
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+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+#ifndef AOM_DSP_ANS_H_
+#define AOM_DSP_ANS_H_
+// Constants, types and utilities for Asymmetric Numeral Systems
+// http://arxiv.org/abs/1311.2540v2
+
+#include <assert.h>
+#include "./aom_config.h"
+#include "aom/aom_integer.h"
+#include "aom_dsp/prob.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif  // __cplusplus
+
+// Use windowed ANS, size is passed in at initialization
+#define ANS_MAX_SYMBOLS 1
+#define ANS_REVERSE 1
+
+typedef uint8_t AnsP8;
+#define ANS_P8_PRECISION 256u
+#define ANS_P8_SHIFT 8
+#define RANS_PROB_BITS 15
+#define RANS_PRECISION (1u << RANS_PROB_BITS)
+
+// L_BASE is the ANS base state. L_BASE % PRECISION must be 0.
+#define L_BASE (1u << 17)
+#define IO_BASE 256
+// Range I = { L_BASE, L_BASE + 1, ..., L_BASE * IO_BASE - 1 }
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif  // __cplusplus
+#endif  // AOM_DSP_ANS_H_