Add ffmpeg externals

Externals/ffmpeg/include/libavutil/murmur3.h

@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2013 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
+ *
+ * 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 AVUTIL_MURMUR3_H
+#define AVUTIL_MURMUR3_H
+
+#include <stdint.h>
+
+struct AVMurMur3 *av_murmur3_alloc(void);
+void av_murmur3_init_seeded(struct AVMurMur3 *c, uint64_t seed);
+void av_murmur3_init(struct AVMurMur3 *c);
+void av_murmur3_update(struct AVMurMur3 *c, const uint8_t *src, int len);
+void av_murmur3_final(struct AVMurMur3 *c, uint8_t dst[16]);
+
+#endif /* AVUTIL_MURMUR3_H */