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diff --git a/third_party/aom/aom_dsp/flow_estimation/flow_estimation.h b/third_party/aom/aom_dsp/flow_estimation/flow_estimation.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_AOM_DSP_FLOW_ESTIMATION_H_
+#define AOM_AOM_DSP_FLOW_ESTIMATION_H_
+
+#include "aom_dsp/pyramid.h"
+#include "aom_dsp/flow_estimation/corner_detect.h"
+#include "aom_ports/mem.h"
+#include "aom_scale/yv12config.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define MAX_PARAMDIM 6
+#define MIN_INLIER_PROB 0.1
+
+/* clang-format off */
+enum {
+  IDENTITY = 0,      // identity transformation, 0-parameter
+  TRANSLATION = 1,   // translational motion 2-parameter
+  ROTZOOM = 2,       // simplified affine with rotation + zoom only, 4-parameter
+  AFFINE = 3,        // affine, 6-parameter
+  TRANS_TYPES,
+} UENUM1BYTE(TransformationType);
+/* clang-format on */
+
+// number of parameters used by each transformation in TransformationTypes
+static const int trans_model_params[TRANS_TYPES] = { 0, 2, 4, 6 };
+
+// Available methods which can be used for global motion estimation
+typedef enum {
+  GLOBAL_MOTION_METHOD_FEATURE_MATCH,
+  GLOBAL_MOTION_METHOD_DISFLOW,
+  GLOBAL_MOTION_METHOD_LAST = GLOBAL_MOTION_METHOD_DISFLOW,
+  GLOBAL_MOTION_METHODS
+} GlobalMotionMethod;
+
+typedef struct {
+  double params[MAX_PARAMDIM];
+  int *inliers;
+  int num_inliers;
+} MotionModel;
+
+// Data structure to store a single correspondence point during global
+// motion search.
+//
+// A correspondence (x, y) -> (rx, ry) means that point (x, y) in the
+// source frame corresponds to point (rx, ry) in the ref frame.
+typedef struct {
+  double x, y;
+  double rx, ry;
+} Correspondence;
+
+// For each global motion method, how many pyramid levels should we allocate?
+// Note that this is a maximum, and fewer levels will be allocated if the frame
+// is not large enough to need all of the specified levels
+extern const int global_motion_pyr_levels[GLOBAL_MOTION_METHODS];
+
+// Which global motion method should we use in practice?
+// Disflow is both faster and gives better results than feature matching in
+// practically all cases, so we use disflow by default
+static const GlobalMotionMethod default_global_motion_method =
+    GLOBAL_MOTION_METHOD_DISFLOW;
+
+extern const double kIdentityParams[MAX_PARAMDIM];
+
+// Compute a global motion model between the given source and ref frames.
+//
+// As is standard for video codecs, the resulting model maps from (x, y)
+// coordinates in `src` to the corresponding points in `ref`, regardless
+// of the temporal order of the two frames.
+//
+// Returns true if global motion estimation succeeded, false if not.
+// The output models should only be used if this function succeeds.
+bool aom_compute_global_motion(TransformationType type, YV12_BUFFER_CONFIG *src,
+                               YV12_BUFFER_CONFIG *ref, int bit_depth,
+                               GlobalMotionMethod gm_method,
+                               MotionModel *motion_models,
+                               int num_motion_models, bool *mem_alloc_failed);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // AOM_AOM_DSP_FLOW_ESTIMATION_H_