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  1. /*
  2.  * AVCodecParser prototypes and definitions
  3.  * Copyright (c) 2003 Fabrice Bellard
  4.  * Copyright (c) 2003 Michael Niedermayer
  5.  *
  6.  * This file is part of FFmpeg.
  7.  *
  8.  * FFmpeg is free software; you can redistribute it and/or
  9.  * modify it under the terms of the GNU Lesser General Public
  10.  * License as published by the Free Software Foundation; either
  11.  * version 2.1 of the License, or (at your option) any later version.
  12.  *
  13.  * FFmpeg is distributed in the hope that it will be useful,
  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16.  * Lesser General Public License for more details.
  17.  *
  18.  * You should have received a copy of the GNU Lesser General Public
  19.  * License along with FFmpeg; if not, write to the Free Software
  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21.  */
  22.  
  23. #ifndef AVCODEC_PARSER_H
  24. #define AVCODEC_PARSER_H
  25.  
  26. #include "avcodec.h"
  27.  
  28. typedef struct ParseContext{
  29.     uint8_t *buffer;
  30.     int index;
  31.     int last_index;
  32.     unsigned int buffer_size;
  33.     uint32_t state;             ///< contains the last few bytes in MSB order
  34.     int frame_start_found;
  35.     int overread;               ///< the number of bytes which where irreversibly read from the next frame
  36.     int overread_index;         ///< the index into ParseContext.buffer of the overread bytes
  37.     uint64_t state64;           ///< contains the last 8 bytes in MSB order
  38. } ParseContext;
  39.  
  40. #define END_NOT_FOUND (-100)
  41.  
  42. /**
  43.  * Combine the (truncated) bitstream to a complete frame.
  44.  * @return -1 if no complete frame could be created,
  45.  *         AVERROR(ENOMEM) if there was a memory allocation error
  46.  */
  47. int ff_combine_frame(ParseContext *pc, int next, const uint8_t **buf, int *buf_size);
  48. int ff_mpeg4video_split(AVCodecContext *avctx, const uint8_t *buf,
  49.                         int buf_size);
  50. void ff_parse_close(AVCodecParserContext *s);
  51.  
  52. /**
  53.  * Fetch timestamps for a specific byte within the current access unit.
  54.  * @param off byte position within the access unit
  55.  * @param remove Found timestamps will be removed if set to 1, kept if set to 0.
  56.  */
  57. void ff_fetch_timestamp(AVCodecParserContext *s, int off, int remove);
  58.  
  59. #endif /* AVCODEC_PARSER_H */
  60.