libavcodec/parser.h

   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 Libav.
   7  *
   8  * Libav 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  * Libav 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 Libav; 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 */