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