drivers/media/video/gspca/jpeg.h

   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 & 0xff;
 145         jpeg_hdr[JPEG_HEIGHT_OFFSET + 2] = width >> 8;
 146         jpeg_hdr[JPEG_HEIGHT_OFFSET + 3] = width & 0xff;
 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 < 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         }
 167 }
 168 #endif