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diff --git a/media/libav/libavutil/random_seed.h b/media/libav/libavutil/random_seed.h
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+++ b/media/libav/libavutil/random_seed.h
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+/*
+ * Copyright (c) 2009 Baptiste Coudurier <baptiste.coudurier@gmail.com>
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVUTIL_RANDOM_SEED_H
+#define AVUTIL_RANDOM_SEED_H
+
+#include <stdint.h>
+/**
+ * @addtogroup lavu_crypto
+ * @{
+ */
+
+/**
+ * Get random data.
+ *
+ * This function can be called repeatedly to generate more random bits
+ * as needed. It is generally quite slow, and usually used to seed a
+ * PRNG.  As it uses /dev/urandom and /dev/random, the quality of the
+ * returned random data depends on the platform.
+ */
+uint32_t av_get_random_seed(void);
+
+/**
+ * @}
+ */
+
+#endif /* AVUTIL_RANDOM_SEED_H */