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diff --git a/third_party/aom/av1/encoder/hash.h b/third_party/aom/av1/encoder/hash.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_H_
+#define AOM_AV1_ENCODER_HASH_H_
+
+#include "config/aom_config.h"
+
+#include "aom/aom_integer.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct _crc_calculator {
+ uint32_t remainder;
+ uint32_t trunc_poly;
+ uint32_t bits;
+ uint32_t table[256];
+ uint32_t final_result_mask;
+} CRC_CALCULATOR;
+
+// Initialize the crc calculator. It must be executed at least once before
+// calling av1_get_crc_value().
+void av1_crc_calculator_init(CRC_CALCULATOR *p_crc_calculator, uint32_t bits,
+ uint32_t truncPoly);
+uint32_t av1_get_crc_value(void *crc_calculator, uint8_t *p, int length);
+
+// CRC32C: POLY = 0x82f63b78;
+typedef struct _CRC32C {
+ /* Table for a quadword-at-a-time software crc. */
+ uint32_t table[8][256];
+} CRC32C;
+
+// init table for software version crc32c
+void av1_crc32c_calculator_init(CRC32C *p_crc32c);
+
+#define AOM_BUFFER_SIZE_FOR_BLOCK_HASH (4096)
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif // AOM_AV1_ENCODER_HASH_H_