Update public FFmpeg header files from r16647 to r18286.

third_party/ffmpeg/include/libavcodec/opt.h

 /*
  * AVOptions
  * copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at>
  *
  * 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_OPT_H
 #define AVCODEC_OPT_H
 
 /**
- * @file opt.h
+ * @file libavcodec/opt.h
  * AVOptions
  */
 
 #include "libavutil/rational.h"
 #include "avcodec.h"
 
 enum AVOptionType{
     FF_OPT_TYPE_FLAGS,
     FF_OPT_TYPE_INT,
     FF_OPT_TYPE_INT64,
@@ skipping 110 matching lines @@
 double av_get_double(void *obj, const char *name, const AVOption **o_out);
 AVRational av_get_q(void *obj, const char *name, const AVOption **o_out);
 int64_t av_get_int(void *obj, const char *name, const AVOption **o_out);
 const char *av_get_string(void *obj, const char *name, const AVOption **o_out, char *buf, int buf_len);
 const AVOption *av_next_option(void *obj, const AVOption *last);
 int av_opt_show(void *obj, void *av_log_obj);
 void av_opt_set_defaults(void *s);
 void av_opt_set_defaults2(void *s, int mask, int flags);
 
 #endif /* AVCODEC_OPT_H */