diff --git a/examples/encoder_util.h b/examples/encoder_util.h
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--- /dev/null
+++ b/examples/encoder_util.h
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+/*
+ * Copyright (c) 2017, 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.
+ */
+
+// Utility functions used by encoder binaries.
+
+#ifndef EXAMPLES_ENCODER_UTIL_H_
+#define EXAMPLES_ENCODER_UTIL_H_
+
+#include "./aom_config.h"
+#include "aom/aom_image.h"
+
+// Returns mismatch location (?loc[0],?loc[1]) and the values at that location
+// in img1 (?loc[2]) and img2 (?loc[3]).
+#if CONFIG_HIGHBITDEPTH
+void aom_find_mismatch_high(const aom_image_t *const img1,
+                            const aom_image_t *const img2, int yloc[4],
+                            int uloc[4], int vloc[4]);
+#endif  // CONFIG_HIGHBITDEPTH
+
+void aom_find_mismatch(const aom_image_t *const img1,
+                       const aom_image_t *const img2, int yloc[4], int uloc[4],
+                       int vloc[4]);
+
+// Returns 1 if the two images match.
+int aom_compare_img(const aom_image_t *const img1,
+                    const aom_image_t *const img2);
+
+#endif  // EXAMPLES_ENCODER_UTIL_H_