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diff --git a/third_party/aom/av1/encoder/hash_motion.h b/third_party/aom/av1/encoder/hash_motion.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_AV1_ENCODER_HASH_MOTION_H_
+#define AOM_AV1_ENCODER_HASH_MOTION_H_
+
+#include "config/aom_config.h"
+
+#include "aom/aom_integer.h"
+#include "aom_scale/yv12config.h"
+#include "third_party/vector/vector.h"
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// store a block's hash info.
+// x and y are the position from the top left of the picture
+// hash_value2 is used to store the second hash value
+typedef struct _block_hash {
+ int16_t x;
+ int16_t y;
+ uint32_t hash_value2;
+} block_hash;
+
+typedef struct _hash_table {
+ Vector **p_lookup_table;
+} hash_table;
+
+void av1_hash_table_init(hash_table *p_hash_table, struct macroblock *x);
+void av1_hash_table_destroy(hash_table *p_hash_table);
+void av1_hash_table_create(hash_table *p_hash_table);
+int32_t av1_hash_table_count(hash_table *p_hash_table, uint32_t hash_value);
+Iterator av1_hash_get_first_iterator(hash_table *p_hash_table,
+ uint32_t hash_value);
+int32_t av1_has_exact_match(hash_table *p_hash_table, uint32_t hash_value1,
+ uint32_t hash_value2);
+void av1_generate_block_2x2_hash_value(const YV12_BUFFER_CONFIG *picture,
+ uint32_t *pic_block_hash[2],
+ int8_t *pic_block_same_info[3],
+ struct macroblock *x);
+void av1_generate_block_hash_value(const YV12_BUFFER_CONFIG *picture,
+ int block_size,
+ uint32_t *src_pic_block_hash[2],
+ uint32_t *dst_pic_block_hash[2],
+ int8_t *src_pic_block_same_info[3],
+ int8_t *dst_pic_block_same_info[3],
+ struct macroblock *x);
+void av1_add_to_hash_map_by_row_with_precal_data(hash_table *p_hash_table,
+ uint32_t *pic_hash[2],
+ int8_t *pic_is_same,
+ int pic_width, int pic_height,
+ int block_size);
+
+// check whether the block starts from (x_start, y_start) with the size of
+// block_size x block_size has the same color in all rows
+int av1_hash_is_horizontal_perfect(const YV12_BUFFER_CONFIG *picture,
+ int block_size, int x_start, int y_start);
+// check whether the block starts from (x_start, y_start) with the size of
+// block_size x block_size has the same color in all columns
+int av1_hash_is_vertical_perfect(const YV12_BUFFER_CONFIG *picture,
+ int block_size, int x_start, int y_start);
+void av1_get_block_hash_value(uint8_t *y_src, int stride, int block_size,
+ uint32_t *hash_value1, uint32_t *hash_value2,
+ int use_highbitdepth, struct macroblock *x);
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif // AOM_AV1_ENCODER_HASH_MOTION_H_