drivers/media/usb/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  */
  22
  23 /*
  24  * generation options
  25  *      CONEX_CAM       Conexant if present
  26  */
  27
  28 /* JPEG header */
  29 static const u8 jpeg_head[] = {
  30         0xff, 0xd8,                     /* jpeg */
  31
  32 /* quantization table quality 50% */
  33         0xff, 0xdb, 0x00, 0x84,         /* DQT */
  34 0,
  35 #define JPEG_QT0_OFFSET 7
  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,
  44 1,
  45 #define JPEG_QT1_OFFSET 72
  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,
  54
  55 /* huffman table */
  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 */
 111 #define JPEG_HDR_SZ 556
 112 #else
 113         0xff, 0xc0, 0x00, 0x11,         /* SOF0 (start of frame 0 */
 114         0x08,                           /* data precision */
 115 #define JPEG_HEIGHT_OFFSET 561
 116         0x01, 0xe0,                     /* height */
 117         0x02, 0x80,                     /* width */
 118         0x03,                           /* component number */
 119                 0x01,
 120                         0x21,           /* samples Y */
 121                         0x00,           /* quant Y */
 122                 0x02, 0x11, 0x01,       /* samples CbCr - quant CbCr */
 123                 0x03, 0x11, 0x01,
 124
 125         0xff, 0xda, 0x00, 0x0c,         /* SOS (start of scan) */
 126         0x03, 0x01, 0x00, 0x02, 0x11, 0x03, 0x11, 0x00, 0x3f, 0x00
 127 #define JPEG_HDR_SZ 589
 128 #endif
 129 };
 130
 131 /* define the JPEG header */
 132 static void jpeg_define(u8 *jpeg_hdr,
 133                         int height,
 134                         int width,
 135                         int samplesY)
 136 {
 137         memcpy(jpeg_hdr, jpeg_head, sizeof jpeg_head);
 138 #ifndef CONEX_CAM
 139         jpeg_hdr[JPEG_HEIGHT_OFFSET + 0] = height >> 8;
 140         jpeg_hdr[JPEG_HEIGHT_OFFSET + 1] = height;
 141         jpeg_hdr[JPEG_HEIGHT_OFFSET + 2] = width >> 8;
 142         jpeg_hdr[JPEG_HEIGHT_OFFSET + 3] = width;
 143         jpeg_hdr[JPEG_HEIGHT_OFFSET + 6] = samplesY;
 144 #endif
 145 }
 146
 147 /* set the JPEG quality */
 148 static void jpeg_set_qual(u8 *jpeg_hdr,
 149                           int quality)
 150 {
 151         int i, sc;
 152
 153         if (quality <= 0)
 154                 sc = 5000;
 155         else if (quality < 50)
 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         }
 165 }
 166 #endif