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diff --git a/media/ffvpx/libavcodec/atsc_a53.h b/media/ffvpx/libavcodec/atsc_a53.h
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+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVCODEC_ATSC_A53_H
+#define AVCODEC_ATSC_A53_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "libavutil/buffer.h"
+#include "libavutil/frame.h"
+
+/**
+ * Check AVFrame for A53 side data and allocate and fill SEI message with A53 info
+ *
+ * @param frame      Raw frame to get A53 side data from
+ * @param prefix_len Number of bytes to allocate before SEI message
+ * @param data       Pointer to a variable to store allocated memory
+ *                   Upon return the variable will hold NULL on error or if frame has no A53 info.
+ *                   Otherwise it will point to prefix_len uninitialized bytes followed by
+ *                   *sei_size SEI message
+ * @param sei_size   Pointer to a variable to store generated SEI message length
+ * @return           Zero on success, negative error code on failure
+ */
+int ff_alloc_a53_sei(const AVFrame *frame, size_t prefix_len,
+                     void **data, size_t *sei_size);
+
+/**
+ * Parse a data array for ATSC A53 Part 4 Closed Captions and store them in an AVBufferRef.
+ *
+ * @param pbuf Pointer to an AVBufferRef to append the closed captions. *pbuf may be NULL, in
+ *             which case a new buffer will be allocated and put in it.
+ * @param data The data array containing the raw A53 data.
+ * @param size Size of the data array in bytes.
+ *
+ * @return Number of closed captions parsed on success, negative error code on failure.
+ *         If no Closed Captions are parsed, *pbuf is untouched.
+ */
+int ff_parse_a53_cc(AVBufferRef **pbuf, const uint8_t *data, int size);
+
+#endif /* AVCODEC_ATSC_A53_H */