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diff --git a/third_party/aom/av1/encoder/optical_flow.h b/third_party/aom/av1/encoder/optical_flow.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_OPTICAL_FLOW_H_
+#define AOM_AV1_ENCODER_OPTICAL_FLOW_H_
+
+#include "aom_scale/yv12config.h"
+#include "av1/common/mv.h"
+#include "config/aom_config.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if CONFIG_OPTICAL_FLOW_API
+
+typedef enum { LUCAS_KANADE, HORN_SCHUNCK } OPTFLOW_METHOD;
+
+typedef enum {
+  MV_FILTER_NONE,
+  MV_FILTER_SMOOTH,
+  MV_FILTER_MEDIAN
+} MV_FILTER_TYPE;
+
+typedef struct LOCALMV {
+  double row;
+  double col;
+} LOCALMV;
+
+#define MAX_PYRAMID_LEVELS 5
+// default options for optical flow
+#define OPFL_WINDOW_SIZE 15
+#define OPFL_PYRAMID_LEVELS 3  // total levels
+#define OPFL_WARPING_STEPS 3
+
+// parameters specific to Lucas-Kanade
+typedef struct lk_params {
+  int window_size;
+} LK_PARAMS;
+
+// generic structure to contain parameters for all
+// optical flow algorithms
+typedef struct opfl_params {
+  int pyramid_levels;
+  int warping_steps;
+  LK_PARAMS *lk_params;
+  int flags;
+} OPFL_PARAMS;
+
+#define OPFL_FLAG_SPARSE 1
+
+void av1_init_opfl_params(OPFL_PARAMS *opfl_params);
+
+void av1_init_lk_params(LK_PARAMS *lk_params);
+
+void av1_optical_flow(const YV12_BUFFER_CONFIG *from_frame,
+                      const YV12_BUFFER_CONFIG *to_frame,
+                      const int from_frame_idx, const int to_frame_idx,
+                      const int bit_depth, const OPFL_PARAMS *opfl_params,
+                      const MV_FILTER_TYPE mv_filter,
+                      const OPTFLOW_METHOD method, MV *mvs);
+#endif
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // AOM_AV1_ENCODER_OPTICAL_FLOW_H_