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  1. /*
  2.  *
  3.  * This file is part of FFmpeg.
  4.  *
  5.  * FFmpeg is free software; you can redistribute it and/or
  6.  * modify it under the terms of the GNU Lesser General Public
  7.  * License as published by the Free Software Foundation; either
  8.  * version 2.1 of the License, or (at your option) any later version.
  9.  *
  10.  * FFmpeg is distributed in the hope that it will be useful,
  11.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13.  * Lesser General Public License for more details.
  14.  *
  15.  * You should have received a copy of the GNU Lesser General Public
  16.  * License along with FFmpeg; if not, write to the Free Software
  17.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  18.  */
  19.  
  20. /**
  21.  * @file
  22.  * A public API for Vorbis parsing
  23.  *
  24.  * Determines the duration for each packet.
  25.  */
  26.  
  27. #ifndef AVCODEC_VORBIS_PARSE_H
  28. #define AVCODEC_VORBIS_PARSE_H
  29.  
  30. #include <stdint.h>
  31.  
  32. typedef struct AVVorbisParseContext AVVorbisParseContext;
  33.  
  34. /**
  35.  * Allocate and initialize the Vorbis parser using headers in the extradata.
  36.  *
  37.  * @param avctx codec context
  38.  * @param s     Vorbis parser context
  39.  */
  40. AVVorbisParseContext *av_vorbis_parse_init(const uint8_t *extradata,
  41.                                            int extradata_size);
  42.  
  43. /**
  44.  * Free the parser and everything associated with it.
  45.  */
  46. void av_vorbis_parse_free(AVVorbisParseContext **s);
  47.  
  48. #define VORBIS_FLAG_HEADER  0x00000001
  49. #define VORBIS_FLAG_COMMENT 0x00000002
  50. #define VORBIS_FLAG_SETUP   0x00000004
  51.  
  52. /**
  53.  * Get the duration for a Vorbis packet.
  54.  *
  55.  * If @p flags is @c NULL,
  56.  * special frames are considered invalid.
  57.  *
  58.  * @param s        Vorbis parser context
  59.  * @param buf      buffer containing a Vorbis frame
  60.  * @param buf_size size of the buffer
  61.  * @param flags    flags for special frames
  62.  */
  63. int av_vorbis_parse_frame_flags(AVVorbisParseContext *s, const uint8_t *buf,
  64.                                 int buf_size, int *flags);
  65.  
  66. /**
  67.  * Get the duration for a Vorbis packet.
  68.  *
  69.  * @param s        Vorbis parser context
  70.  * @param buf      buffer containing a Vorbis frame
  71.  * @param buf_size size of the buffer
  72.  */
  73. int av_vorbis_parse_frame(AVVorbisParseContext *s, const uint8_t *buf,
  74.                           int buf_size);
  75.  
  76. void av_vorbis_parse_reset(AVVorbisParseContext *s);
  77.  
  78. #endif /* AVCODEC_VORBIS_PARSE_H */
  79.