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 27 /* 28 * generation options 29 * CONEX_CAM Conexant if present 30 */ 31 32 /* JPEG header */ 33 static const u8 jpeg_head[] = { 34 0xff, 0xd8, /* jpeg */ 35 36 /* quantization table quality 50% */ 37 0xff, 0xdb, 0x00, 0x84, /* DQT */ 38 0, 39 #define JPEG_QT0_OFFSET 7 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, 48 1, 49 #define JPEG_QT1_OFFSET 72 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, 58 59 /* huffman table */ 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 */ 115 #define JPEG_HDR_SZ 556 116 #else 117 0xff, 0xc0, 0x00, 0x11, /* SOF0 (start of frame 0 */ 118 0x08, /* data precision */ 119 #define JPEG_HEIGHT_OFFSET 561 120 0x01, 0xe0, /* height */ 121 0x02, 0x80, /* width */ 122 0x03, /* component number */ 123 0x01, 124 0x21, /* samples Y */ 125 0x00, /* quant Y */ 126 0x02, 0x11, 0x01, /* samples CbCr - quant CbCr */ 127 0x03, 0x11, 0x01, 128 129 0xff, 0xda, 0x00, 0x0c, /* SOS (start of scan) */ 130 0x03, 0x01, 0x00, 0x02, 0x11, 0x03, 0x11, 0x00, 0x3f, 0x00 131 #define JPEG_HDR_SZ 589 132 #endif 133 }; 134 135 /* define the JPEG header */ 136 static void jpeg_define(u8 *jpeg_hdr, 137 int height, 138 int width, 139 int samplesY) 140 { 141 memcpy(jpeg_hdr, jpeg_head, sizeof jpeg_head); 142 #ifndef CONEX_CAM 143 jpeg_hdr[JPEG_HEIGHT_OFFSET + 0] = height >> 8; 144 jpeg_hdr[JPEG_HEIGHT_OFFSET + 1] = height; 145 jpeg_hdr[JPEG_HEIGHT_OFFSET + 2] = width >> 8; 146 jpeg_hdr[JPEG_HEIGHT_OFFSET + 3] = width; 147 jpeg_hdr[JPEG_HEIGHT_OFFSET + 6] = samplesY; 148 #endif 149 } 150 151 /* 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 <= 0) 158 sc = 5000; 159 else if (quality < 50) 160 sc = 5000 / quality; 161 else 162 sc = 200 - quality * 2; 163 for (i = 0; i < 64; i++) { 164 jpeg_hdr[JPEG_QT0_OFFSET + i] = 165 (jpeg_head[JPEG_QT0_OFFSET + i] * sc + 50) / 100; 166 jpeg_hdr[JPEG_QT1_OFFSET + i] = 167 (jpeg_head[JPEG_QT1_OFFSET + i] * sc + 50) / 100; 168 } 169 } 170 #endif 171