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  1. /*
  2.  * Copyright (c) 2012 Justin Ruggles
  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. /**
  22.  * @file
  23.  * Vorbis audio parser
  24.  *
  25.  * Determines the duration for each packet.
  26.  */
  27.  
  28. #ifndef AVCODEC_VORBIS_PARSER_H
  29. #define AVCODEC_VORBIS_PARSER_H
  30.  
  31. #include "avcodec.h"
  32. #include "vorbis_parser.h"
  33.  
  34. struct AVVorbisParseContext {
  35.     const AVClass *class;
  36.     int extradata_parsed;       ///< we have attempted to parse extradata
  37.     int valid_extradata;        ///< extradata is valid, so we can calculate duration
  38.     int blocksize[2];           ///< short and long window sizes
  39.     int previous_blocksize;     ///< previous window size
  40.     int mode_blocksize[64];     ///< window size mapping for each mode
  41.     int mode_count;             ///< number of modes
  42.     int mode_mask;              ///< bitmask used to get the mode in each packet
  43.     int prev_mask;              ///< bitmask used to get the previous mode flag in each packet
  44. };
  45.  
  46. #if LIBAVCODEC_VERSION_MAJOR < 57
  47. /**
  48.  * Initialize the Vorbis parser using headers in the extradata.
  49.  *
  50.  * @param avctx codec context
  51.  * @param s     Vorbis parser context
  52.  */
  53. int avpriv_vorbis_parse_extradata(AVCodecContext *avctx, AVVorbisParseContext *s);
  54.  
  55. /**
  56.  * Get the duration for a Vorbis packet.
  57.  *
  58.  * avpriv_vorbis_parse_extradata() must have been successfully called prior to
  59.  * this in order for a correct duration to be returned. If @p flags is @c NULL,
  60.  * special frames are considered invalid.
  61.  *
  62.  * @param s        Vorbis parser context
  63.  * @param buf      buffer containing a Vorbis frame
  64.  * @param buf_size size of the buffer
  65.  * @param flags    flags for special frames
  66.  */
  67. int avpriv_vorbis_parse_frame_flags(AVVorbisParseContext *s, const uint8_t *buf,
  68.                                     int buf_size, int *flags);
  69.  
  70. /**
  71.  * Get the duration for a Vorbis packet.
  72.  *
  73.  * avpriv_vorbis_parse_extradata() must have been successfully called prior to
  74.  * this in order for a correct duration to be returned.
  75.  *
  76.  * @param s        Vorbis parser context
  77.  * @param buf      buffer containing a Vorbis frame
  78.  * @param buf_size size of the buffer
  79.  */
  80. int avpriv_vorbis_parse_frame(AVVorbisParseContext *s, const uint8_t *buf,
  81.                               int buf_size);
  82.  
  83. void avpriv_vorbis_parse_reset(AVVorbisParseContext *s);
  84. #endif
  85.  
  86. #endif /* AVCODEC_VORBIS_PARSER_H */
  87.