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diff --git a/third_party/aom/common/av1_config.h b/third_party/aom/common/av1_config.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_COMMON_AV1_CONFIG_H_
+#define AOM_COMMON_AV1_CONFIG_H_
+
+#include "aom/aom_integer.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Struct representing ISOBMFF/Matroska AV1 config. See:
+// https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox-syntax
+//
+// The AV1 config has the following format:
+//
+// unsigned int (1) marker = 1;
+// unsigned int (7) version = 1;
+// unsigned int (3) seq_profile;
+// unsigned int (5) seq_level_idx_0;
+// unsigned int (1) seq_tier_0;
+// unsigned int (1) high_bitdepth;
+// unsigned int (1) twelve_bit;
+// unsigned int (1) monochrome;
+// unsigned int (1) chroma_subsampling_x;
+// unsigned int (1) chroma_subsampling_y;
+// unsigned int (2) chroma_sample_position;
+// unsigned int (3) reserved = 0;
+//
+// unsigned int (1) initial_presentation_delay_present;
+// if (initial_presentation_delay_present) {
+//   unsigned int (4) initial_presentation_delay_minus_one;
+// } else {
+//   unsigned int (4) reserved = 0;
+// }
+//
+// unsigned int (8)[] configOBUs;
+//
+// Note: get_av1config_from_obu() does not currently store 'configOBUs' data, so
+// the field is omitted.
+typedef struct _Av1Config {
+  uint8_t marker;
+  uint8_t version;
+  uint8_t seq_profile;
+  uint8_t seq_level_idx_0;
+  uint8_t seq_tier_0;
+  uint8_t high_bitdepth;
+  uint8_t twelve_bit;
+  uint8_t monochrome;
+  uint8_t chroma_subsampling_x;
+  uint8_t chroma_subsampling_y;
+  uint8_t chroma_sample_position;
+  uint8_t initial_presentation_delay_present;
+  uint8_t initial_presentation_delay_minus_one;
+} Av1Config;
+
+// Attempts to parse a Sequence Header OBU and set the paramenters of 'config'.
+// Returns 0 upon success, and -1 upon failure. 'buffer' can contain multiple
+// OBUs, but the Sequence Header OBU must be the first OBU within the buffer.
+int get_av1config_from_obu(const uint8_t *buffer, size_t length, int is_annexb,
+                           Av1Config *config);
+
+// Attempts to parse an AV1 config from 'buffer'. Returns 0 upon success.
+// Returns -1 when 'buffer_length' is less than 4, when passed NULL pointers, or
+// when parsing of 'buffer' fails.
+int read_av1config(const uint8_t *buffer, size_t buffer_length,
+                   size_t *bytes_read, Av1Config *config);
+
+// Writes 'config' to 'buffer'. Returns 0 upon successful write to 'buffer'.
+// Returns -1 when passed NULL pointers or when 'capacity' insufficient.
+int write_av1config(const Av1Config *config, size_t capacity,
+                    size_t *bytes_written, uint8_t *buffer);
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif  // AOM_COMMON_AV1_CONFIG_H_