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diff --git a/third_party/aom/av1/common/obu_util.h b/third_party/aom/av1/common/obu_util.h
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+/*
+ * Copyright (c) 2018, 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_COMMON_OBU_UTIL_H_
+#define AOM_AV1_COMMON_OBU_UTIL_H_
+
+#include "aom/aom_codec.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct {
+ size_t size; // Size (1 or 2 bytes) of the OBU header (including the
+ // optional OBU extension header) in the bitstream.
+ OBU_TYPE type;
+ int has_size_field;
+ int has_extension;
+ // The following fields come from the OBU extension header and therefore are
+ // only used if has_extension is true.
+ int temporal_layer_id;
+ int spatial_layer_id;
+} ObuHeader;
+
+aom_codec_err_t aom_read_obu_header(uint8_t *buffer, size_t buffer_length,
+ size_t *consumed, ObuHeader *header,
+ int is_annexb);
+
+aom_codec_err_t aom_read_obu_header_and_size(const uint8_t *data,
+ size_t bytes_available,
+ int is_annexb,
+ ObuHeader *obu_header,
+ size_t *const payload_size,
+ size_t *const bytes_read);
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif // AOM_AV1_COMMON_OBU_UTIL_H_