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diff --git a/third_party/aom/av1/encoder/cost.h b/third_party/aom/av1/encoder/cost.h
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+++ b/third_party/aom/av1/encoder/cost.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 AV1_ENCODER_COST_H_
+#define AV1_ENCODER_COST_H_
+
+#include "aom_dsp/prob.h"
+#include "aom/aom_integer.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern const uint16_t av1_prob_cost[256];
+
+// The factor to scale from cost in bits to cost in av1_prob_cost units.
+#define AV1_PROB_COST_SHIFT 9
+
+#define av1_cost_zero(prob) (av1_prob_cost[prob])
+
+#define av1_cost_one(prob) av1_cost_zero(256 - (prob))
+
+#define av1_cost_bit(prob, bit) av1_cost_zero((bit) ? 256 - (prob) : (prob))
+
+// Cost of coding an n bit literal, using 128 (i.e. 50%) probability
+// for each bit.
+#define av1_cost_literal(n) ((n) * (1 << AV1_PROB_COST_SHIFT))
+
+static INLINE unsigned int cost_branch256(const unsigned int ct[2],
+                                          aom_prob p) {
+  return ct[0] * av1_cost_zero(p) + ct[1] * av1_cost_one(p);
+}
+
+static INLINE int treed_cost(aom_tree tree, const aom_prob *probs, int bits,
+                             int len) {
+  int cost = 0;
+  aom_tree_index i = 0;
+
+  do {
+    const int bit = (bits >> --len) & 1;
+    cost += av1_cost_bit(probs[i >> 1], bit);
+    i = tree[i + bit];
+  } while (len);
+
+  return cost;
+}
+
+void av1_cost_tokens(int *costs, const aom_prob *probs, aom_tree tree);
+void av1_cost_tokens_skip(int *costs, const aom_prob *probs, aom_tree tree);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // AV1_ENCODER_COST_H_