libavcodec/xiph.h

   1 /*
   2  * Copyright (C) 2007  FFmpeg Project
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #ifndef AVCODEC_XIPH_H
  22 #define AVCODEC_XIPH_H
  23
  24 #include "libavutil/common.h"
  25
  26 /**
  27  * Splits a single extradata buffer into the three headers that most
  28  * Xiph codecs use. (e.g. Theora and Vorbis)
  29  * Works both with Matroska's packing and lavc's packing.
  30  *
  31  * @param[in] extradata The single chunk that combines all three headers
  32  * @param[in] extradata_size The size of the extradata buffer
  33  * @param[in] first_header_size The size of the first header, used to
  34  * differentiate between the Matroska packing and lavc packing.
  35  * @param[out] header_start Pointers to the start of the three separate headers.
  36  * @param[out] header_len The sizes of each of the three headers.
  37  * @return On error a negative value is returned, on success zero.
  38  */
  39 int ff_split_xiph_headers(uint8_t *extradata, int extradata_size,
  40                           int first_header_size, uint8_t *header_start[3],
  41                           int header_len[3]);
  42
  43 #endif /* AVCODEC_XIPH_H */