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63eb9546 JFM |
1 | #ifndef JPEG_H |
2 | #define JPEG_H 1 | |
3 | /* | |
4 | * Insert a JPEG header at start of frame | |
5 | * | |
6 | * This module is used by the gspca subdrivers. | |
7 | * A special case is done for Conexant webcams. | |
8 | * | |
9 | * Copyright (C) Jean-Francois Moine (http://moinejf.free.fr) | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
24 | * | |
25 | */ | |
26 | ||
36e819db JFM |
27 | /* |
28 | * generation options | |
29 | * CONEX_CAM Conexant if present | |
36e819db JFM |
30 | */ |
31 | ||
71cb2764 | 32 | /* JPEG header */ |
36e819db | 33 | static const u8 jpeg_head[] = { |
63eb9546 | 34 | 0xff, 0xd8, /* jpeg */ |
71cb2764 JFM |
35 | |
36 | /* quantization table quality 50% */ | |
63eb9546 | 37 | 0xff, 0xdb, 0x00, 0x84, /* DQT */ |
63eb9546 | 38 | 0, |
71cb2764 | 39 | #define JPEG_QT0_OFFSET 7 |
36e819db JFM |
40 | 0x10, 0x0b, 0x0c, 0x0e, 0x0c, 0x0a, 0x10, 0x0e, |
41 | 0x0d, 0x0e, 0x12, 0x11, 0x10, 0x13, 0x18, 0x28, | |
42 | 0x1a, 0x18, 0x16, 0x16, 0x18, 0x31, 0x23, 0x25, | |
43 | 0x1d, 0x28, 0x3a, 0x33, 0x3d, 0x3c, 0x39, 0x33, | |
44 | 0x38, 0x37, 0x40, 0x48, 0x5c, 0x4e, 0x40, 0x44, | |
45 | 0x57, 0x45, 0x37, 0x38, 0x50, 0x6d, 0x51, 0x57, | |
46 | 0x5f, 0x62, 0x67, 0x68, 0x67, 0x3e, 0x4d, 0x71, | |
47 | 0x79, 0x70, 0x64, 0x78, 0x5c, 0x65, 0x67, 0x63, | |
63eb9546 | 48 | 1, |
71cb2764 | 49 | #define JPEG_QT1_OFFSET 72 |
36e819db JFM |
50 | 0x11, 0x12, 0x12, 0x18, 0x15, 0x18, 0x2f, 0x1a, |
51 | 0x1a, 0x2f, 0x63, 0x42, 0x38, 0x42, 0x63, 0x63, | |
52 | 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, | |
53 | 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, | |
54 | 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, | |
55 | 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, | |
56 | 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, | |
57 | 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, | |
63eb9546 | 58 | |
36e819db | 59 | /* huffman table */ |
63eb9546 JFM |
60 | 0xff, 0xc4, 0x01, 0xa2, |
61 | 0x00, 0x00, 0x01, 0x05, 0x01, 0x01, 0x01, 0x01, | |
62 | 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
63 | 0x00, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, | |
64 | 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x01, 0x00, 0x03, | |
65 | 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, | |
66 | 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, | |
67 | 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, | |
68 | 0x0a, 0x0b, 0x10, 0x00, 0x02, 0x01, 0x03, 0x03, | |
69 | 0x02, 0x04, 0x03, 0x05, 0x05, 0x04, 0x04, 0x00, | |
70 | 0x00, 0x01, 0x7d, 0x01, 0x02, 0x03, 0x00, 0x04, | |
71 | 0x11, 0x05, 0x12, 0x21, 0x31, 0x41, 0x06, 0x13, | |
72 | 0x51, 0x61, 0x07, 0x22, 0x71, 0x14, 0x32, 0x81, | |
73 | 0x91, 0xa1, 0x08, 0x23, 0x42, 0xb1, 0xc1, 0x15, | |
74 | 0x52, 0xd1, 0xf0, 0x24, 0x33, 0x62, 0x72, 0x82, | |
75 | 0x09, 0x0a, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x25, | |
76 | 0x26, 0x27, 0x28, 0x29, 0x2a, 0x34, 0x35, 0x36, | |
77 | 0x37, 0x38, 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, | |
78 | 0x47, 0x48, 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, | |
79 | 0x57, 0x58, 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, | |
80 | 0x67, 0x68, 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, | |
81 | 0x77, 0x78, 0x79, 0x7a, 0x83, 0x84, 0x85, 0x86, | |
82 | 0x87, 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, | |
83 | 0x96, 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, | |
84 | 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, | |
85 | 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, | |
86 | 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, | |
87 | 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, | |
88 | 0xda, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, | |
89 | 0xe8, 0xe9, 0xea, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, | |
90 | 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0x11, 0x00, 0x02, | |
91 | 0x01, 0x02, 0x04, 0x04, 0x03, 0x04, 0x07, 0x05, | |
92 | 0x04, 0x04, 0x00, 0x01, 0x02, 0x77, 0x00, 0x01, | |
93 | 0x02, 0x03, 0x11, 0x04, 0x05, 0x21, 0x31, 0x06, | |
94 | 0x12, 0x41, 0x51, 0x07, 0x61, 0x71, 0x13, 0x22, | |
95 | 0x32, 0x81, 0x08, 0x14, 0x42, 0x91, 0xa1, 0xb1, | |
96 | 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0, 0x15, 0x62, | |
97 | 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34, 0xe1, 0x25, | |
98 | 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26, 0x27, 0x28, | |
99 | 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, | |
100 | 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, | |
101 | 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, | |
102 | 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, | |
103 | 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, | |
104 | 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, | |
105 | 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, | |
106 | 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, | |
107 | 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, | |
108 | 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5, | |
109 | 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4, | |
110 | 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe2, 0xe3, | |
111 | 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xf2, | |
112 | 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, | |
113 | #ifdef CONEX_CAM | |
114 | /* the Conexant frames start with SOF0 */ | |
71cb2764 | 115 | #define JPEG_HDR_SZ 556 |
63eb9546 JFM |
116 | #else |
117 | 0xff, 0xc0, 0x00, 0x11, /* SOF0 (start of frame 0 */ | |
118 | 0x08, /* data precision */ | |
71cb2764 JFM |
119 | #define JPEG_HEIGHT_OFFSET 561 |
120 | 0x01, 0xe0, /* height */ | |
121 | 0x02, 0x80, /* width */ | |
122 | 0x03, /* component number */ | |
123 | 0x01, | |
124 | 0x21, /* samples Y */ | |
63eb9546 JFM |
125 | 0x00, /* quant Y */ |
126 | 0x02, 0x11, 0x01, /* samples CbCr - quant CbCr */ | |
127 | 0x03, 0x11, 0x01, | |
128 | ||
d43fa32f | 129 | 0xff, 0xda, 0x00, 0x0c, /* SOS (start of scan) */ |
63eb9546 | 130 | 0x03, 0x01, 0x00, 0x02, 0x11, 0x03, 0x11, 0x00, 0x3f, 0x00 |
71cb2764 | 131 | #define JPEG_HDR_SZ 589 |
63eb9546 | 132 | #endif |
71cb2764 | 133 | }; |
63eb9546 | 134 | |
71cb2764 JFM |
135 | /* define the JPEG header */ |
136 | static void jpeg_define(u8 *jpeg_hdr, | |
137 | int height, | |
138 | int width, | |
139 | int samplesY) | |
63eb9546 | 140 | { |
71cb2764 | 141 | memcpy(jpeg_hdr, jpeg_head, sizeof jpeg_head); |
63eb9546 | 142 | #ifndef CONEX_CAM |
71cb2764 | 143 | jpeg_hdr[JPEG_HEIGHT_OFFSET + 0] = height >> 8; |
ded5e903 | 144 | jpeg_hdr[JPEG_HEIGHT_OFFSET + 1] = height; |
71cb2764 | 145 | jpeg_hdr[JPEG_HEIGHT_OFFSET + 2] = width >> 8; |
ded5e903 | 146 | jpeg_hdr[JPEG_HEIGHT_OFFSET + 3] = width; |
71cb2764 | 147 | jpeg_hdr[JPEG_HEIGHT_OFFSET + 6] = samplesY; |
63eb9546 | 148 | #endif |
71cb2764 | 149 | } |
63eb9546 | 150 | |
71cb2764 JFM |
151 | /* set the JPEG quality */ |
152 | static void jpeg_set_qual(u8 *jpeg_hdr, | |
153 | int quality) | |
154 | { | |
155 | int i, sc; | |
156 | ||
157 | if (quality < 50) | |
158 | sc = 5000 / quality; | |
159 | else | |
160 | sc = 200 - quality * 2; | |
161 | for (i = 0; i < 64; i++) { | |
162 | jpeg_hdr[JPEG_QT0_OFFSET + i] = | |
163 | (jpeg_head[JPEG_QT0_OFFSET + i] * sc + 50) / 100; | |
164 | jpeg_hdr[JPEG_QT1_OFFSET + i] = | |
165 | (jpeg_head[JPEG_QT1_OFFSET + i] * sc + 50) / 100; | |
166 | } | |
63eb9546 JFM |
167 | } |
168 | #endif |