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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 "libavutil/internal.h" | |
37 | ||
38 | #include "avcodec.h" | |
39 | #include "put_bits.h" | |
40 | ||
41 | /* JPEG marker codes */ | |
42 | typedef enum { | |
43 | /* start of frame */ | |
44 | SOF0 = 0xc0, /* baseline */ | |
45 | SOF1 = 0xc1, /* extended sequential, huffman */ | |
46 | SOF2 = 0xc2, /* progressive, huffman */ | |
47 | SOF3 = 0xc3, /* lossless, huffman */ | |
48 | ||
49 | SOF5 = 0xc5, /* differential sequential, huffman */ | |
50 | SOF6 = 0xc6, /* differential progressive, huffman */ | |
51 | SOF7 = 0xc7, /* differential lossless, huffman */ | |
52 | JPG = 0xc8, /* reserved for JPEG extension */ | |
53 | SOF9 = 0xc9, /* extended sequential, arithmetic */ | |
54 | SOF10 = 0xca, /* progressive, arithmetic */ | |
55 | SOF11 = 0xcb, /* lossless, arithmetic */ | |
56 | ||
57 | SOF13 = 0xcd, /* differential sequential, arithmetic */ | |
58 | SOF14 = 0xce, /* differential progressive, arithmetic */ | |
59 | SOF15 = 0xcf, /* differential lossless, arithmetic */ | |
60 | ||
61 | DHT = 0xc4, /* define huffman tables */ | |
62 | ||
63 | DAC = 0xcc, /* define arithmetic-coding conditioning */ | |
64 | ||
65 | /* restart with modulo 8 count "m" */ | |
66 | RST0 = 0xd0, | |
67 | RST1 = 0xd1, | |
68 | RST2 = 0xd2, | |
69 | RST3 = 0xd3, | |
70 | RST4 = 0xd4, | |
71 | RST5 = 0xd5, | |
72 | RST6 = 0xd6, | |
73 | RST7 = 0xd7, | |
74 | ||
75 | SOI = 0xd8, /* start of image */ | |
76 | EOI = 0xd9, /* end of image */ | |
77 | SOS = 0xda, /* start of scan */ | |
78 | DQT = 0xdb, /* define quantization tables */ | |
79 | DNL = 0xdc, /* define number of lines */ | |
80 | DRI = 0xdd, /* define restart interval */ | |
81 | DHP = 0xde, /* define hierarchical progression */ | |
82 | EXP = 0xdf, /* expand reference components */ | |
83 | ||
84 | APP0 = 0xe0, | |
85 | APP1 = 0xe1, | |
86 | APP2 = 0xe2, | |
87 | APP3 = 0xe3, | |
88 | APP4 = 0xe4, | |
89 | APP5 = 0xe5, | |
90 | APP6 = 0xe6, | |
91 | APP7 = 0xe7, | |
92 | APP8 = 0xe8, | |
93 | APP9 = 0xe9, | |
94 | APP10 = 0xea, | |
95 | APP11 = 0xeb, | |
96 | APP12 = 0xec, | |
97 | APP13 = 0xed, | |
98 | APP14 = 0xee, | |
99 | APP15 = 0xef, | |
100 | ||
101 | JPG0 = 0xf0, | |
102 | JPG1 = 0xf1, | |
103 | JPG2 = 0xf2, | |
104 | JPG3 = 0xf3, | |
105 | JPG4 = 0xf4, | |
106 | JPG5 = 0xf5, | |
107 | JPG6 = 0xf6, | |
108 | SOF48 = 0xf7, ///< JPEG-LS | |
109 | LSE = 0xf8, ///< JPEG-LS extension parameters | |
110 | JPG9 = 0xf9, | |
111 | JPG10 = 0xfa, | |
112 | JPG11 = 0xfb, | |
113 | JPG12 = 0xfc, | |
114 | JPG13 = 0xfd, | |
115 | ||
116 | COM = 0xfe, /* comment */ | |
117 | ||
118 | TEM = 0x01, /* temporary private use for arithmetic coding */ | |
119 | ||
120 | /* 0x02 -> 0xbf reserved */ | |
121 | } JPEG_MARKER; | |
122 | ||
123 | static inline void put_marker(PutBitContext *p, int code) | |
124 | { | |
125 | put_bits(p, 8, 0xff); | |
126 | put_bits(p, 8, code); | |
127 | } | |
128 | ||
129 | #define PREDICT(ret, topleft, top, left, predictor)\ | |
130 | switch(predictor){\ | |
131 | case 0: ret= 0; break;\ | |
132 | case 1: ret= left; break;\ | |
133 | case 2: ret= top; break;\ | |
134 | case 3: ret= topleft; break;\ | |
135 | case 4: ret= left + top - topleft; break;\ | |
136 | case 5: ret= left + ((top - topleft)>>1); break;\ | |
137 | case 6: ret= top + ((left - topleft)>>1); break;\ | |
138 | default:\ | |
139 | case 7: ret= (left + top)>>1; break;\ | |
140 | } | |
141 | ||
142 | extern av_export const uint8_t avpriv_mjpeg_bits_dc_luminance[]; | |
143 | extern av_export const uint8_t avpriv_mjpeg_val_dc[]; | |
144 | ||
145 | extern av_export const uint8_t avpriv_mjpeg_bits_dc_chrominance[]; | |
146 | ||
147 | extern av_export const uint8_t avpriv_mjpeg_bits_ac_luminance[]; | |
148 | extern av_export const uint8_t avpriv_mjpeg_val_ac_luminance[]; | |
149 | ||
150 | extern av_export const uint8_t avpriv_mjpeg_bits_ac_chrominance[]; | |
151 | extern av_export const uint8_t avpriv_mjpeg_val_ac_chrominance[]; | |
152 | ||
153 | void ff_mjpeg_build_huffman_codes(uint8_t *huff_size, uint16_t *huff_code, | |
154 | const uint8_t *bits_table, | |
155 | const uint8_t *val_table); | |
156 | ||
157 | #endif /* AVCODEC_MJPEG_H */ |