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parser.h
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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{
30  int index;
32  unsigned int buffer_size;
33  uint32_t state; ///< contains the last few bytes in MSB order
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);
49  int buf_size);
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  * @param fuzzy Only use found value if it is more informative than what we already have
57  */
58 void ff_fetch_timestamp(AVCodecParserContext *s, int off, int remove, int fuzzy);
59 
60 #endif /* AVCODEC_PARSER_H */
const char * s
Definition: avisynth_c.h:768
int ff_mpeg4video_split(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: parser.c:328
void ff_parse_close(AVCodecParserContext *s)
Definition: parser.c:321
int frame_start_found
Definition: parser.h:34
uint8_t
int ff_combine_frame(ParseContext *pc, int next, const uint8_t **buf, int *buf_size)
Combine the (truncated) bitstream to a complete frame.
Definition: parser.c:245
unsigned int buffer_size
Definition: parser.h:32
int overread_index
the index into ParseContext.buffer of the overread bytes
Definition: parser.h:36
int overread
the number of bytes which where irreversibly read from the next frame
Definition: parser.h:35
int last_index
Definition: parser.h:31
uint8_t * buffer
Definition: parser.h:29
Libavcodec external API header.
main external API structure.
Definition: avcodec.h:1659
void * buf
Definition: avisynth_c.h:690
uint32_t state
contains the last few bytes in MSB order
Definition: parser.h:33
uint64_t state64
contains the last 8 bytes in MSB order
Definition: parser.h:37
void ff_fetch_timestamp(AVCodecParserContext *s, int off, int remove, int fuzzy)
Fetch timestamps for a specific byte within the current access unit.
Definition: parser.c:105
int index
Definition: parser.h:30