LXR linux/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 * 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 */
  33static const u8 jpeg_head[] = {
  34        0xff, 0xd8,                     /* jpeg */
  35
  36/* quantization table quality 50% */
  37        0xff, 0xdb, 0x00, 0x84,         /* DQT */
  380,
  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,
  481,
  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 */
 136static 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 */
 152static 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