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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 | #include "mjpeg.h" | |
34 | ||
35 | ||
36 | #if 0 | |
37 | /* These are the sample quantization tables given in JPEG spec section K.1. | |
38 | * The spec says that the values given produce "good" quality, and | |
39 | * when divided by 2, "very good" quality. | |
40 | */ | |
41 | static const unsigned char std_luminance_quant_tbl[64] = { | |
42 | 16, 11, 10, 16, 24, 40, 51, 61, | |
43 | 12, 12, 14, 19, 26, 58, 60, 55, | |
44 | 14, 13, 16, 24, 40, 57, 69, 56, | |
45 | 14, 17, 22, 29, 51, 87, 80, 62, | |
46 | 18, 22, 37, 56, 68, 109, 103, 77, | |
47 | 24, 35, 55, 64, 81, 104, 113, 92, | |
48 | 49, 64, 78, 87, 103, 121, 120, 101, | |
49 | 72, 92, 95, 98, 112, 100, 103, 99 | |
50 | }; | |
51 | static const unsigned char std_chrominance_quant_tbl[64] = { | |
52 | 17, 18, 24, 47, 99, 99, 99, 99, | |
53 | 18, 21, 26, 66, 99, 99, 99, 99, | |
54 | 24, 26, 56, 99, 99, 99, 99, 99, | |
55 | 47, 66, 99, 99, 99, 99, 99, 99, | |
56 | 99, 99, 99, 99, 99, 99, 99, 99, | |
57 | 99, 99, 99, 99, 99, 99, 99, 99, | |
58 | 99, 99, 99, 99, 99, 99, 99, 99, | |
59 | 99, 99, 99, 99, 99, 99, 99, 99 | |
60 | }; | |
61 | #endif | |
62 | ||
63 | /* Set up the standard Huffman tables (cf. JPEG standard section K.3) */ | |
64 | /* IMPORTANT: these are only valid for 8-bit data precision! */ | |
65 | const uint8_t avpriv_mjpeg_bits_dc_luminance[17] = | |
66 | { /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 }; | |
67 | const uint8_t avpriv_mjpeg_val_dc[12] = | |
68 | { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 }; | |
69 | ||
70 | const uint8_t avpriv_mjpeg_bits_dc_chrominance[17] = | |
71 | { /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 }; | |
72 | ||
73 | const uint8_t avpriv_mjpeg_bits_ac_luminance[17] = | |
74 | { /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d }; | |
75 | const uint8_t avpriv_mjpeg_val_ac_luminance[] = | |
76 | { 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12, | |
77 | 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07, | |
78 | 0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08, | |
79 | 0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0, | |
80 | 0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16, | |
81 | 0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28, | |
82 | 0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, | |
83 | 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, | |
84 | 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, | |
85 | 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, | |
86 | 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, | |
87 | 0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, | |
88 | 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, | |
89 | 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, | |
90 | 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, | |
91 | 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5, | |
92 | 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4, | |
93 | 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2, | |
94 | 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, | |
95 | 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, | |
96 | 0xf9, 0xfa | |
97 | }; | |
98 | ||
99 | const uint8_t avpriv_mjpeg_bits_ac_chrominance[17] = | |
100 | { /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 }; | |
101 | ||
102 | const uint8_t avpriv_mjpeg_val_ac_chrominance[] = | |
103 | { 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21, | |
104 | 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71, | |
105 | 0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91, | |
106 | 0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0, | |
107 | 0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34, | |
108 | 0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26, | |
109 | 0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38, | |
110 | 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, | |
111 | 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, | |
112 | 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, | |
113 | 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, | |
114 | 0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, | |
115 | 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, | |
116 | 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, | |
117 | 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, | |
118 | 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, | |
119 | 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, | |
120 | 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, | |
121 | 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, | |
122 | 0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, | |
123 | 0xf9, 0xfa | |
124 | }; | |
125 | ||
126 | /* isn't this function nicer than the one in the libjpeg ? */ | |
127 | void ff_mjpeg_build_huffman_codes(uint8_t *huff_size, uint16_t *huff_code, | |
128 | const uint8_t *bits_table, | |
129 | const uint8_t *val_table) | |
130 | { | |
131 | int i, j, k,nb, code, sym; | |
132 | ||
133 | code = 0; | |
134 | k = 0; | |
135 | for(i=1;i<=16;i++) { | |
136 | nb = bits_table[i]; | |
137 | for(j=0;j<nb;j++) { | |
138 | sym = val_table[k++]; | |
139 | huff_size[sym] = i; | |
140 | huff_code[sym] = code; | |
141 | code++; | |
142 | } | |
143 | code <<= 1; | |
144 | } | |
145 | } |