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diff --git a/media/ffvpx/libavutil/bprint.h b/media/ffvpx/libavutil/bprint.h
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+/*
+ * Copyright (c) 2012 Nicolas George
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * @ingroup lavu_avbprint
+ * AVBPrint public header
+ */
+
+#ifndef AVUTIL_BPRINT_H
+#define AVUTIL_BPRINT_H
+
+#include <stdarg.h>
+
+#include "attributes.h"
+#include "avstring.h"
+
+/**
+ * @defgroup lavu_avbprint AVBPrint
+ * @ingroup lavu_data
+ *
+ * A buffer to print data progressively
+ * @{
+ */
+
+/**
+ * Define a structure with extra padding to a fixed size
+ * This helps ensuring binary compatibility with future versions.
+ */
+
+#define FF_PAD_STRUCTURE(name, size, ...) \
+struct ff_pad_helper_##name { __VA_ARGS__ }; \
+typedef struct name { \
+    __VA_ARGS__ \
+    char reserved_padding[size - sizeof(struct ff_pad_helper_##name)]; \
+} name;
+
+/**
+ * Buffer to print data progressively
+ *
+ * The string buffer grows as necessary and is always 0-terminated.
+ * The content of the string is never accessed, and thus is
+ * encoding-agnostic and can even hold binary data.
+ *
+ * Small buffers are kept in the structure itself, and thus require no
+ * memory allocation at all (unless the contents of the buffer is needed
+ * after the structure goes out of scope). This is almost as lightweight as
+ * declaring a local `char buf[512]`.
+ *
+ * The length of the string can go beyond the allocated size: the buffer is
+ * then truncated, but the functions still keep account of the actual total
+ * length.
+ *
+ * In other words, AVBPrint.len can be greater than AVBPrint.size and records
+ * the total length of what would have been to the buffer if there had been
+ * enough memory.
+ *
+ * Append operations do not need to be tested for failure: if a memory
+ * allocation fails, data stop being appended to the buffer, but the length
+ * is still updated. This situation can be tested with
+ * av_bprint_is_complete().
+ *
+ * The AVBPrint.size_max field determines several possible behaviours:
+ * - `size_max = -1` (= `UINT_MAX`) or any large value will let the buffer be
+ *   reallocated as necessary, with an amortized linear cost.
+ * - `size_max = 0` prevents writing anything to the buffer: only the total
+ *   length is computed. The write operations can then possibly be repeated in
+ *   a buffer with exactly the necessary size
+ *   (using `size_init = size_max = len + 1`).
+ * - `size_max = 1` is automatically replaced by the exact size available in the
+ *   structure itself, thus ensuring no dynamic memory allocation. The
+ *   internal buffer is large enough to hold a reasonable paragraph of text,
+ *   such as the current paragraph.
+ */
+
+FF_PAD_STRUCTURE(AVBPrint, 1024,
+    char *str;         /**< string so far */
+    unsigned len;      /**< length so far */
+    unsigned size;     /**< allocated memory */
+    unsigned size_max; /**< maximum allocated memory */
+    char reserved_internal_buffer[1];
+)
+
+/**
+ * @name Max size special values
+ * Convenience macros for special values for av_bprint_init() size_max
+ * parameter.
+ * @{
+ */
+
+/**
+ * Buffer will be reallocated as necessary, with an amortized linear cost.
+ */
+#define AV_BPRINT_SIZE_UNLIMITED  ((unsigned)-1)
+/**
+ * Use the exact size available in the AVBPrint structure itself.
+ *
+ * Thus ensuring no dynamic memory allocation. The internal buffer is large
+ * enough to hold a reasonable paragraph of text, such as the current paragraph.
+ */
+#define AV_BPRINT_SIZE_AUTOMATIC  1
+/**
+ * Do not write anything to the buffer, only calculate the total length.
+ *
+ * The write operations can then possibly be repeated in a buffer with
+ * exactly the necessary size (using `size_init = size_max = AVBPrint.len + 1`).
+ */
+#define AV_BPRINT_SIZE_COUNT_ONLY 0
+/** @} */
+
+/**
+ * Init a print buffer.
+ *
+ * @param buf        buffer to init
+ * @param size_init  initial size (including the final 0)
+ * @param size_max   maximum size;
+ *                   - `0` means do not write anything, just count the length
+ *                   - `1` is replaced by the maximum value for automatic storage
+ *                       any large value means that the internal buffer will be
+ *                       reallocated as needed up to that limit
+ *                   - `-1` is converted to `UINT_MAX`, the largest limit possible.
+ *                   Check also `AV_BPRINT_SIZE_*` macros.
+ */
+void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max);
+
+/**
+ * Init a print buffer using a pre-existing buffer.
+ *
+ * The buffer will not be reallocated.
+ * In case size equals zero, the AVBPrint will be initialized to use
+ * the internal buffer as if using AV_BPRINT_SIZE_COUNT_ONLY with
+ * av_bprint_init().
+ *
+ * @param buf     buffer structure to init
+ * @param buffer  byte buffer to use for the string data
+ * @param size    size of buffer
+ */
+void av_bprint_init_for_buffer(AVBPrint *buf, char *buffer, unsigned size);
+
+/**
+ * Append a formatted string to a print buffer.
+ */
+void av_bprintf(AVBPrint *buf, const char *fmt, ...) av_printf_format(2, 3);
+
+/**
+ * Append a formatted string to a print buffer.
+ */
+void av_vbprintf(AVBPrint *buf, const char *fmt, va_list vl_arg);
+
+/**
+ * Append char c n times to a print buffer.
+ */
+void av_bprint_chars(AVBPrint *buf, char c, unsigned n);
+
+/**
+ * Append data to a print buffer.
+ *
+ * param buf  bprint buffer to use
+ * param data pointer to data
+ * param size size of data
+ */
+void av_bprint_append_data(AVBPrint *buf, const char *data, unsigned size);
+
+struct tm;
+/**
+ * Append a formatted date and time to a print buffer.
+ *
+ * param buf  bprint buffer to use
+ * param fmt  date and time format string, see strftime()
+ * param tm   broken-down time structure to translate
+ *
+ * @note due to poor design of the standard strftime function, it may
+ * produce poor results if the format string expands to a very long text and
+ * the bprint buffer is near the limit stated by the size_max option.
+ */
+void av_bprint_strftime(AVBPrint *buf, const char *fmt, const struct tm *tm);
+
+/**
+ * Allocate bytes in the buffer for external use.
+ *
+ * @param[in]  buf          buffer structure
+ * @param[in]  size         required size
+ * @param[out] mem          pointer to the memory area
+ * @param[out] actual_size  size of the memory area after allocation;
+ *                          can be larger or smaller than size
+ */
+void av_bprint_get_buffer(AVBPrint *buf, unsigned size,
+                          unsigned char **mem, unsigned *actual_size);
+
+/**
+ * Reset the string to "" but keep internal allocated data.
+ */
+void av_bprint_clear(AVBPrint *buf);
+
+/**
+ * Test if the print buffer is complete (not truncated).
+ *
+ * It may have been truncated due to a memory allocation failure
+ * or the size_max limit (compare size and size_max if necessary).
+ */
+static inline int av_bprint_is_complete(const AVBPrint *buf)
+{
+    return buf->len < buf->size;
+}
+
+/**
+ * Finalize a print buffer.
+ *
+ * The print buffer can no longer be used afterwards,
+ * but the len and size fields are still valid.
+ *
+ * @arg[out] ret_str  if not NULL, used to return a permanent copy of the
+ *                    buffer contents, or NULL if memory allocation fails;
+ *                    if NULL, the buffer is discarded and freed
+ * @return  0 for success or error code (probably AVERROR(ENOMEM))
+ */
+int av_bprint_finalize(AVBPrint *buf, char **ret_str);
+
+/**
+ * Escape the content in src and append it to dstbuf.
+ *
+ * @param dstbuf        already inited destination bprint buffer
+ * @param src           string containing the text to escape
+ * @param special_chars string containing the special characters which
+ *                      need to be escaped, can be NULL
+ * @param mode          escape mode to employ, see AV_ESCAPE_MODE_* macros.
+ *                      Any unknown value for mode will be considered equivalent to
+ *                      AV_ESCAPE_MODE_BACKSLASH, but this behaviour can change without
+ *                      notice.
+ * @param flags         flags which control how to escape, see AV_ESCAPE_FLAG_* macros
+ */
+void av_bprint_escape(AVBPrint *dstbuf, const char *src, const char *special_chars,
+                      enum AVEscapeMode mode, int flags);
+
+/** @} */
+
+#endif /* AVUTIL_BPRINT_H */