1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
/*
* MJPEG encoder and decoder
* Copyright (c) 2000, 2001 Fabrice Bellard.
* Copyright (c) 2003 Alex Beregszaszi
* Copyright (c) 2003-2004 Michael Niedermayer
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Support for external huffman table, various fixes (AVID workaround),
* aspecting, new decode_frame mechanism and apple mjpeg-b support
* by Alex Beregszaszi
*/
/**
* @file mjpeg.h
* MJPEG encoder and decoder.
*/
#ifndef MJPEG_H
#define MJPEG_H
#include "avcodec.h"
#include "bitstream.h"
#include "dsputil.h"
#include "mpegvideo.h"
/* JPEG marker codes */
typedef enum {
/* start of frame */
SOF0 = 0xc0, /* baseline */
SOF1 = 0xc1, /* extended sequential, huffman */
SOF2 = 0xc2, /* progressive, huffman */
SOF3 = 0xc3, /* lossless, huffman */
SOF5 = 0xc5, /* differential sequential, huffman */
SOF6 = 0xc6, /* differential progressive, huffman */
SOF7 = 0xc7, /* differential lossless, huffman */
JPG = 0xc8, /* reserved for JPEG extension */
SOF9 = 0xc9, /* extended sequential, arithmetic */
SOF10 = 0xca, /* progressive, arithmetic */
SOF11 = 0xcb, /* lossless, arithmetic */
SOF13 = 0xcd, /* differential sequential, arithmetic */
SOF14 = 0xce, /* differential progressive, arithmetic */
SOF15 = 0xcf, /* differential lossless, arithmetic */
DHT = 0xc4, /* define huffman tables */
DAC = 0xcc, /* define arithmetic-coding conditioning */
/* restart with modulo 8 count "m" */
RST0 = 0xd0,
RST1 = 0xd1,
RST2 = 0xd2,
RST3 = 0xd3,
RST4 = 0xd4,
RST5 = 0xd5,
RST6 = 0xd6,
RST7 = 0xd7,
SOI = 0xd8, /* start of image */
EOI = 0xd9, /* end of image */
SOS = 0xda, /* start of scan */
DQT = 0xdb, /* define quantization tables */
DNL = 0xdc, /* define number of lines */
DRI = 0xdd, /* define restart interval */
DHP = 0xde, /* define hierarchical progression */
EXP = 0xdf, /* expand reference components */
APP0 = 0xe0,
APP1 = 0xe1,
APP2 = 0xe2,
APP3 = 0xe3,
APP4 = 0xe4,
APP5 = 0xe5,
APP6 = 0xe6,
APP7 = 0xe7,
APP8 = 0xe8,
APP9 = 0xe9,
APP10 = 0xea,
APP11 = 0xeb,
APP12 = 0xec,
APP13 = 0xed,
APP14 = 0xee,
APP15 = 0xef,
JPG0 = 0xf0,
JPG1 = 0xf1,
JPG2 = 0xf2,
JPG3 = 0xf3,
JPG4 = 0xf4,
JPG5 = 0xf5,
JPG6 = 0xf6,
SOF48 = 0xf7, ///< JPEG-LS
LSE = 0xf8, ///< JPEG-LS extension parameters
JPG9 = 0xf9,
JPG10 = 0xfa,
JPG11 = 0xfb,
JPG12 = 0xfc,
JPG13 = 0xfd,
COM = 0xfe, /* comment */
TEM = 0x01, /* temporary private use for arithmetic coding */
/* 0x02 -> 0xbf reserved */
} JPEG_MARKER;
static inline void put_marker(PutBitContext *p, int code)
{
put_bits(p, 8, 0xff);
put_bits(p, 8, code);
}
#define MAX_COMPONENTS 4
typedef struct MJpegDecodeContext {
AVCodecContext *avctx;
GetBitContext gb;
int start_code; /* current start code */
int buffer_size;
uint8_t *buffer;
int16_t quant_matrixes[4][64];
VLC vlcs[2][4];
int qscale[4]; ///< quantizer scale calculated from quant_matrixes
int org_height; /* size given at codec init */
int first_picture; /* true if decoding first picture */
int interlaced; /* true if interlaced */
int bottom_field; /* true if bottom field */
int lossless;
int ls;
int progressive;
int rgb;
int rct; /* standard rct */
int pegasus_rct; /* pegasus reversible colorspace transform */
int bits; /* bits per component */
int maxval;
int near; ///< near lossless bound (si 0 for lossless)
int t1,t2,t3;
int reset; ///< context halfing intervall ?rename
int width, height;
int mb_width, mb_height;
int nb_components;
int component_id[MAX_COMPONENTS];
int h_count[MAX_COMPONENTS]; /* horizontal and vertical count for each component */
int v_count[MAX_COMPONENTS];
int comp_index[MAX_COMPONENTS];
int dc_index[MAX_COMPONENTS];
int ac_index[MAX_COMPONENTS];
int nb_blocks[MAX_COMPONENTS];
int h_scount[MAX_COMPONENTS];
int v_scount[MAX_COMPONENTS];
int h_max, v_max; /* maximum h and v counts */
int quant_index[4]; /* quant table index for each component */
int last_dc[MAX_COMPONENTS]; /* last DEQUANTIZED dc (XXX: am I right to do that ?) */
AVFrame picture; /* picture structure */
int linesize[MAX_COMPONENTS]; ///< linesize << interlaced
int8_t *qscale_table;
DECLARE_ALIGNED_8(DCTELEM, block[64]);
ScanTable scantable;
DSPContext dsp;
int restart_interval;
int restart_count;
int buggy_avid;
int cs_itu601;
int interlace_polarity;
int mjpb_skiptosod;
int cur_scan; /* current scan, used by JPEG-LS */
} MJpegDecodeContext;
#define PREDICT(ret, topleft, top, left, predictor)\
switch(predictor){\
case 1: ret= left; break;\
case 2: ret= top; break;\
case 3: ret= topleft; break;\
case 4: ret= left + top - topleft; break;\
case 5: ret= left + ((top - topleft)>>1); break;\
case 6: ret= top + ((left - topleft)>>1); break;\
default:\
case 7: ret= (left + top)>>1; break;\
}
extern const uint8_t ff_mjpeg_bits_dc_luminance[];
extern const uint8_t ff_mjpeg_val_dc_luminance[];
extern const uint8_t ff_mjpeg_bits_dc_chrominance[];
extern const uint8_t ff_mjpeg_val_dc_chrominance[];
extern const uint8_t ff_mjpeg_bits_ac_luminance[];
extern const uint8_t ff_mjpeg_val_ac_luminance[];
extern const uint8_t ff_mjpeg_bits_ac_chrominance[];
extern const uint8_t ff_mjpeg_val_ac_chrominance[];
void ff_mjpeg_build_huffman_codes(uint8_t *huff_size, uint16_t *huff_code,
const uint8_t *bits_table,
const uint8_t *val_table);
#endif /* MJPEG_H */
|
