FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
mjpeg.h
Go to the documentation of this file.
1 /*
2  * MJPEG encoder and decoder
3  * Copyright (c) 2000, 2001 Fabrice Bellard
4  * Copyright (c) 2003 Alex Beregszaszi
5  * Copyright (c) 2003-2004 Michael Niedermayer
6  *
7  * Support for external huffman table, various fixes (AVID workaround),
8  * aspecting, new decode_frame mechanism and apple mjpeg-b support
9  * by Alex Beregszaszi
10  *
11  * This file is part of FFmpeg.
12  *
13  * FFmpeg is free software; you can redistribute it and/or
14  * modify it under the terms of the GNU Lesser General Public
15  * License as published by the Free Software Foundation; either
16  * version 2.1 of the License, or (at your option) any later version.
17  *
18  * FFmpeg is distributed in the hope that it will be useful,
19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21  * Lesser General Public License for more details.
22  *
23  * You should have received a copy of the GNU Lesser General Public
24  * License along with FFmpeg; if not, write to the Free Software
25  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26  */
27 
28 /**
29  * @file
30  * MJPEG encoder and decoder.
31  */
32 
33 #ifndef AVCODEC_MJPEG_H
34 #define AVCODEC_MJPEG_H
35 
36 #include "avcodec.h"
37 #include "put_bits.h"
38 
39 
40 /* JPEG marker codes */
41 typedef enum {
42  /* start of frame */
43  SOF0 = 0xc0, /* baseline */
44  SOF1 = 0xc1, /* extended sequential, huffman */
45  SOF2 = 0xc2, /* progressive, huffman */
46  SOF3 = 0xc3, /* lossless, huffman */
47 
48  SOF5 = 0xc5, /* differential sequential, huffman */
49  SOF6 = 0xc6, /* differential progressive, huffman */
50  SOF7 = 0xc7, /* differential lossless, huffman */
51  JPG = 0xc8, /* reserved for JPEG extension */
52  SOF9 = 0xc9, /* extended sequential, arithmetic */
53  SOF10 = 0xca, /* progressive, arithmetic */
54  SOF11 = 0xcb, /* lossless, arithmetic */
55 
56  SOF13 = 0xcd, /* differential sequential, arithmetic */
57  SOF14 = 0xce, /* differential progressive, arithmetic */
58  SOF15 = 0xcf, /* differential lossless, arithmetic */
59 
60  DHT = 0xc4, /* define huffman tables */
61 
62  DAC = 0xcc, /* define arithmetic-coding conditioning */
63 
64  /* restart with modulo 8 count "m" */
65  RST0 = 0xd0,
66  RST1 = 0xd1,
67  RST2 = 0xd2,
68  RST3 = 0xd3,
69  RST4 = 0xd4,
70  RST5 = 0xd5,
71  RST6 = 0xd6,
72  RST7 = 0xd7,
73 
74  SOI = 0xd8, /* start of image */
75  EOI = 0xd9, /* end of image */
76  SOS = 0xda, /* start of scan */
77  DQT = 0xdb, /* define quantization tables */
78  DNL = 0xdc, /* define number of lines */
79  DRI = 0xdd, /* define restart interval */
80  DHP = 0xde, /* define hierarchical progression */
81  EXP = 0xdf, /* expand reference components */
82 
83  APP0 = 0xe0,
84  APP1 = 0xe1,
85  APP2 = 0xe2,
86  APP3 = 0xe3,
87  APP4 = 0xe4,
88  APP5 = 0xe5,
89  APP6 = 0xe6,
90  APP7 = 0xe7,
91  APP8 = 0xe8,
92  APP9 = 0xe9,
93  APP10 = 0xea,
94  APP11 = 0xeb,
95  APP12 = 0xec,
96  APP13 = 0xed,
97  APP14 = 0xee,
98  APP15 = 0xef,
99 
100  JPG0 = 0xf0,
101  JPG1 = 0xf1,
102  JPG2 = 0xf2,
103  JPG3 = 0xf3,
104  JPG4 = 0xf4,
105  JPG5 = 0xf5,
106  JPG6 = 0xf6,
107  SOF48 = 0xf7, ///< JPEG-LS
108  LSE = 0xf8, ///< JPEG-LS extension parameters
109  JPG9 = 0xf9,
110  JPG10 = 0xfa,
111  JPG11 = 0xfb,
112  JPG12 = 0xfc,
113  JPG13 = 0xfd,
114 
115  COM = 0xfe, /* comment */
116 
117  TEM = 0x01, /* temporary private use for arithmetic coding */
118 
119  /* 0x02 -> 0xbf reserved */
120 } JPEG_MARKER;
121 
122 static inline void put_marker(PutBitContext *p, int code)
123 {
124  put_bits(p, 8, 0xff);
125  put_bits(p, 8, code);
126 }
127 
128 #define PREDICT(ret, topleft, top, left, predictor)\
129  switch(predictor){\
130  case 0: ret= 0; break;\
131  case 1: ret= left; break;\
132  case 2: ret= top; break;\
133  case 3: ret= topleft; break;\
134  case 4: ret= left + top - topleft; break;\
135  case 5: ret= left + ((top - topleft)>>1); break;\
136  case 6: ret= top + ((left - topleft)>>1); break;\
137  default:\
138  case 7: ret= (left + top)>>1; break;\
139  }
140 
142 extern av_export const uint8_t avpriv_mjpeg_val_dc[];
143 
145 
148 
151 
152 void ff_mjpeg_build_huffman_codes(uint8_t *huff_size, uint16_t *huff_code,
153  const uint8_t *bits_table,
154  const uint8_t *val_table);
155 
156 #endif /* AVCODEC_MJPEG_H */