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diff --git a/third_party/aom/av1/encoder/global_motion.h b/third_party/aom/av1/encoder/global_motion.h
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+++ b/third_party/aom/av1/encoder/global_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_GLOBAL_MOTION_H_
+#define AOM_AV1_ENCODER_GLOBAL_MOTION_H_
+
+#include "aom/aom_integer.h"
+#include "aom_scale/yv12config.h"
+#include "av1/common/mv.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define RANSAC_NUM_MOTIONS 1
+
+void convert_model_to_params(const double *params, WarpedMotionParams *model);
+
+int is_enough_erroradvantage(double best_erroradvantage, int params_cost,
+                             int erroradv_type);
+
+// Returns the av1_warp_error between "dst" and the result of applying the
+// motion params that result from fine-tuning "wm" to "ref". Note that "wm" is
+// modified in place.
+int64_t refine_integerized_param(WarpedMotionParams *wm,
+                                 TransformationType wmtype, int use_hbd, int bd,
+                                 uint8_t *ref, int r_width, int r_height,
+                                 int r_stride, uint8_t *dst, int d_width,
+                                 int d_height, int d_stride, int n_refinements,
+                                 int64_t best_frame_error);
+
+/*
+  Computes "num_motions" candidate global motion parameters between two frames.
+  The array "params_by_motion" should be length 8 * "num_motions". The ordering
+  of each set of parameters is best described  by the homography:
+
+        [x'     (m2 m3 m0   [x
+    z .  y'  =   m4 m5 m1 *  y
+         1]      m6 m7 1)    1]
+
+  where m{i} represents the ith value in any given set of parameters.
+
+  "num_inliers" should be length "num_motions", and will be populated with the
+  number of inlier feature points for each motion. Params for which the
+  num_inliers entry is 0 should be ignored by the caller.
+*/
+int compute_global_motion_feature_based(TransformationType type,
+                                        YV12_BUFFER_CONFIG *frm,
+                                        YV12_BUFFER_CONFIG *ref, int bit_depth,
+                                        int *num_inliers_by_motion,
+                                        double *params_by_motion,
+                                        int num_motions);
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+#endif  // AOM_AV1_ENCODER_GLOBAL_MOTION_H_