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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.  
  33. typedef struct VorbisParseContext {
  34.     AVCodecContext *avctx;      ///< codec context
  35.     int extradata_parsed;       ///< we have attempted to parse extradata
  36.     int valid_extradata;        ///< extradata is valid, so we can calculate duration
  37.     int blocksize[2];           ///< short and long window sizes
  38.     int previous_blocksize;     ///< previous window size
  39.     int mode_blocksize[64];     ///< window size mapping for each mode
  40.     int mode_count;             ///< number of modes
  41.     int mode_mask;              ///< bitmask used to get the mode in each packet
  42.     int prev_mask;              ///< bitmask used to get the previous mode flag in each packet
  43. } VorbisParseContext;
  44.  
  45. /**
  46.  * Initialize the Vorbis parser using headers in the extradata.
  47.  *
  48.  * @param avctx codec context
  49.  * @param s     Vorbis parser context
  50.  */
  51. int avpriv_vorbis_parse_extradata(AVCodecContext *avctx, VorbisParseContext *s);
  52.  
  53. /**
  54.  * Get the duration for a Vorbis packet.
  55.  *
  56.  * avpriv_vorbis_parse_extradata() must have been successfully called prior to
  57.  * this in order for a correct duration to be returned.
  58.  *
  59.  * @param s        Vorbis parser context
  60.  * @param buf      buffer containing a Vorbis frame
  61.  * @param buf_size size of the buffer
  62.  */
  63. int avpriv_vorbis_parse_frame(VorbisParseContext *s, const uint8_t *buf,
  64.                               int buf_size);
  65.  
  66. void avpriv_vorbis_parse_reset(VorbisParseContext *s);
  67.  
  68. #endif /* AVCODEC_VORBIS_PARSER_H */
  69.