text: /*
   * 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
   * A public API for Vorbis parsing
   *
   * Determines the duration for each packet.
   */
  
  #ifndef AVCODEC_VORBIS_PARSER_H
  #define AVCODEC_VORBIS_PARSER_H
  
  #include <stdint.h>
  
  typedef struct AVVorbisParseContext AVVorbisParseContext;
  
  /**
   * Allocate and initialize the Vorbis parser using headers in the extradata.
   *
   * @param avctx codec context
   * @param s     Vorbis parser context
   */
  AVVorbisParseContext *av_vorbis_parse_init(const uint8_t *extradata,
                                             int extradata_size);
  
  /**
   * Free the parser and everything associated with it.
   */
  void av_vorbis_parse_free(AVVorbisParseContext **s);
  
  #define VORBIS_FLAG_HEADER  0x00000001
  #define VORBIS_FLAG_COMMENT 0x00000002
  #define VORBIS_FLAG_SETUP   0x00000004
  
  /**
   * Get the duration for a Vorbis packet.
   *
   * If @p flags is @c NULL,
   * special frames are considered invalid.
   *
   * @param s        Vorbis parser context
   * @param buf      buffer containing a Vorbis frame
   * @param buf_size size of the buffer
   * @param flags    flags for special frames
   */
  int av_vorbis_parse_frame_flags(AVVorbisParseContext *s, const uint8_t *buf,
                                  int buf_size, int *flags);
  
  /**
   * Get the duration for a Vorbis packet.
   *
   * @param s        Vorbis parser context
   * @param buf      buffer containing a Vorbis frame
   * @param buf_size size of the buffer
   */
  int av_vorbis_parse_frame(AVVorbisParseContext *s, const uint8_t *buf,
                            int buf_size);
  
  void av_vorbis_parse_reset(AVVorbisParseContext *s);
  
  #endif /* AVCODEC_VORBIS_PARSER_H */
  