projects / mirror_ubuntu-artful-kernel.git / blame
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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 | * | |
| 63eb9546 JFM |
21 | */ |
| 22 | ||
| 36e819db JFM |
23 | /* |
| 24 | * generation options | |
| 25 | * CONEX_CAM Conexant if present | |
| 36e819db JFM |
26 | */ |
| 27 | ||
| 71cb2764 | 28 | /* JPEG header */ |
| 36e819db | 29 | static const u8 jpeg_head[] = { |
| 63eb9546 | 30 | 0xff, 0xd8, /* jpeg */ |
| 71cb2764 JFM |
31 | |
| 32 | /* quantization table quality 50% */ | |
| 63eb9546 | 33 | 0xff, 0xdb, 0x00, 0x84, /* DQT */ |
| 63eb9546 | 34 | 0, |
| 71cb2764 | 35 | #define JPEG_QT0_OFFSET 7 |
| 36e819db JFM |
36 | 0x10, 0x0b, 0x0c, 0x0e, 0x0c, 0x0a, 0x10, 0x0e, |
| 37 | 0x0d, 0x0e, 0x12, 0x11, 0x10, 0x13, 0x18, 0x28, | |
| 38 | 0x1a, 0x18, 0x16, 0x16, 0x18, 0x31, 0x23, 0x25, | |
| 39 | 0x1d, 0x28, 0x3a, 0x33, 0x3d, 0x3c, 0x39, 0x33, | |
| 40 | 0x38, 0x37, 0x40, 0x48, 0x5c, 0x4e, 0x40, 0x44, | |
| 41 | 0x57, 0x45, 0x37, 0x38, 0x50, 0x6d, 0x51, 0x57, | |
| 42 | 0x5f, 0x62, 0x67, 0x68, 0x67, 0x3e, 0x4d, 0x71, | |
| 43 | 0x79, 0x70, 0x64, 0x78, 0x5c, 0x65, 0x67, 0x63, | |
| 63eb9546 | 44 | 1, |
| 71cb2764 | 45 | #define JPEG_QT1_OFFSET 72 |
| 36e819db JFM |
46 | 0x11, 0x12, 0x12, 0x18, 0x15, 0x18, 0x2f, 0x1a, |
| 47 | 0x1a, 0x2f, 0x63, 0x42, 0x38, 0x42, 0x63, 0x63, | |
| 48 | 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, | |
| 49 | 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, | |
| 50 | 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, | |
| 51 | 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, | |
| 52 | 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, | |
| 53 | 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, | |
| 63eb9546 | 54 | |
| 36e819db | 55 | /* huffman table */ |
| 63eb9546 JFM |
56 | 0xff, 0xc4, 0x01, 0xa2, |
| 57 | 0x00, 0x00, 0x01, 0x05, 0x01, 0x01, 0x01, 0x01, | |
| 58 | 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 59 | 0x00, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, | |
| 60 | 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x01, 0x00, 0x03, | |
| 61 | 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, | |
| 62 | 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, | |
| 63 | 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, | |
| 64 | 0x0a, 0x0b, 0x10, 0x00, 0x02, 0x01, 0x03, 0x03, | |
| 65 | 0x02, 0x04, 0x03, 0x05, 0x05, 0x04, 0x04, 0x00, | |
| 66 | 0x00, 0x01, 0x7d, 0x01, 0x02, 0x03, 0x00, 0x04, | |
| 67 | 0x11, 0x05, 0x12, 0x21, 0x31, 0x41, 0x06, 0x13, | |
| 68 | 0x51, 0x61, 0x07, 0x22, 0x71, 0x14, 0x32, 0x81, | |
| 69 | 0x91, 0xa1, 0x08, 0x23, 0x42, 0xb1, 0xc1, 0x15, | |
| 70 | 0x52, 0xd1, 0xf0, 0x24, 0x33, 0x62, 0x72, 0x82, | |
| 71 | 0x09, 0x0a, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x25, | |
| 72 | 0x26, 0x27, 0x28, 0x29, 0x2a, 0x34, 0x35, 0x36, | |
| 73 | 0x37, 0x38, 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, | |
| 74 | 0x47, 0x48, 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, | |
| 75 | 0x57, 0x58, 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, | |
| 76 | 0x67, 0x68, 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, | |
| 77 | 0x77, 0x78, 0x79, 0x7a, 0x83, 0x84, 0x85, 0x86, | |
| 78 | 0x87, 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, | |
| 79 | 0x96, 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, | |
| 80 | 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, | |
| 81 | 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, | |
| 82 | 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, | |
| 83 | 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, | |
| 84 | 0xda, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, | |
| 85 | 0xe8, 0xe9, 0xea, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, | |
| 86 | 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0x11, 0x00, 0x02, | |
| 87 | 0x01, 0x02, 0x04, 0x04, 0x03, 0x04, 0x07, 0x05, | |
| 88 | 0x04, 0x04, 0x00, 0x01, 0x02, 0x77, 0x00, 0x01, | |
| 89 | 0x02, 0x03, 0x11, 0x04, 0x05, 0x21, 0x31, 0x06, | |
| 90 | 0x12, 0x41, 0x51, 0x07, 0x61, 0x71, 0x13, 0x22, | |
| 91 | 0x32, 0x81, 0x08, 0x14, 0x42, 0x91, 0xa1, 0xb1, | |
| 92 | 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0, 0x15, 0x62, | |
| 93 | 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34, 0xe1, 0x25, | |
| 94 | 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26, 0x27, 0x28, | |
| 95 | 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, | |
| 96 | 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, | |
| 97 | 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, | |
| 98 | 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, | |
| 99 | 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, | |
| 100 | 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, | |
| 101 | 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, | |
| 102 | 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, | |
| 103 | 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, | |
| 104 | 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5, | |
| 105 | 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4, | |
| 106 | 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe2, 0xe3, | |
| 107 | 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xf2, | |
| 108 | 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, | |
| 109 | #ifdef CONEX_CAM | |
| 110 | /* the Conexant frames start with SOF0 */ | |
| 71cb2764 | 111 | #define JPEG_HDR_SZ 556 |
| 63eb9546 JFM |
112 | #else |
| 113 | 0xff, 0xc0, 0x00, 0x11, /* SOF0 (start of frame 0 */ | |
| 114 | 0x08, /* data precision */ | |
| 71cb2764 JFM |
115 | #define JPEG_HEIGHT_OFFSET 561 |
| 116 | 0x01, 0xe0, /* height */ | |
| 117 | 0x02, 0x80, /* width */ | |
| 118 | 0x03, /* component number */ | |
| 119 | 0x01, | |
| 120 | 0x21, /* samples Y */ | |
| 63eb9546 JFM |
121 | 0x00, /* quant Y */ |
| 122 | 0x02, 0x11, 0x01, /* samples CbCr - quant CbCr */ | |
| 123 | 0x03, 0x11, 0x01, | |
| 124 | ||
| d43fa32f | 125 | 0xff, 0xda, 0x00, 0x0c, /* SOS (start of scan) */ |
| 63eb9546 | 126 | 0x03, 0x01, 0x00, 0x02, 0x11, 0x03, 0x11, 0x00, 0x3f, 0x00 |
| 71cb2764 | 127 | #define JPEG_HDR_SZ 589 |
| 63eb9546 | 128 | #endif |
| 71cb2764 | 129 | }; |
| 63eb9546 | 130 | |
| 71cb2764 JFM |
131 | /* define the JPEG header */ |
| 132 | static void jpeg_define(u8 *jpeg_hdr, | |
| 133 | int height, | |
| 134 | int width, | |
| 135 | int samplesY) | |
| 63eb9546 | 136 | { |
| 71cb2764 | 137 | memcpy(jpeg_hdr, jpeg_head, sizeof jpeg_head); |
| 63eb9546 | 138 | #ifndef CONEX_CAM |
| 71cb2764 | 139 | jpeg_hdr[JPEG_HEIGHT_OFFSET + 0] = height >> 8; |
| ded5e903 | 140 | jpeg_hdr[JPEG_HEIGHT_OFFSET + 1] = height; |
| 71cb2764 | 141 | jpeg_hdr[JPEG_HEIGHT_OFFSET + 2] = width >> 8; |
| ded5e903 | 142 | jpeg_hdr[JPEG_HEIGHT_OFFSET + 3] = width; |
| 71cb2764 | 143 | jpeg_hdr[JPEG_HEIGHT_OFFSET + 6] = samplesY; |
| 63eb9546 | 144 | #endif |
| 71cb2764 | 145 | } |
| 63eb9546 | 146 | |
| 71cb2764 JFM |
147 | /* set the JPEG quality */ |
| 148 | static void jpeg_set_qual(u8 *jpeg_hdr, | |
| 149 | int quality) | |
| 150 | { | |
| 151 | int i, sc; | |
| 152 | ||
| 32654fba MCC |
153 | if (quality <= 0) |
| 154 | sc = 5000; | |
| 155 | else if (quality < 50) | |
| 71cb2764 JFM |
156 | sc = 5000 / quality; |
| 157 | else | |
| 158 | sc = 200 - quality * 2; | |
| 159 | for (i = 0; i < 64; i++) { | |
| 160 | jpeg_hdr[JPEG_QT0_OFFSET + i] = | |
| 161 | (jpeg_head[JPEG_QT0_OFFSET + i] * sc + 50) / 100; | |
| 162 | jpeg_hdr[JPEG_QT1_OFFSET + i] = | |
| 163 | (jpeg_head[JPEG_QT1_OFFSET + i] * sc + 50) / 100; | |
| 164 | } | |
| 63eb9546 JFM |
165 | } |
| 166 | #endif |