drivers/media/video/pwc/pwc-misc.c

   1 /* Linux driver for Philips webcam
   2    Various miscellaneous functions and tables.
   3    (C) 1999-2003 Nemosoft Unv.
   4    (C) 2004      Luc Saillard (luc@saillard.org)
   5
   6    NOTE: this version of pwc is an unofficial (modified) release of pwc & pcwx
   7    driver and thus may have bugs that are not present in the original version.
   8    Please send bug reports and support requests to <luc@saillard.org>.
   9    The decompression routines have been implemented by reverse-engineering the
  10    Nemosoft binary pwcx module. Caveat emptor.
  11
  12    This program is free software; you can redistribute it and/or modify
  13    it under the terms of the GNU General Public License as published by
  14    the Free Software Foundation; either version 2 of the License, or
  15    (at your option) any later version.
  16
  17    This program is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20    GNU General Public License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program; if not, write to the Free Software
  24    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  25 */
  26
  27 #include <linux/slab.h>
  28
  29 #include "pwc.h"
  30
  31 struct pwc_coord pwc_image_sizes[PSZ_MAX] =
  32 {
  33         { 128,  96, 0 },
  34         { 160, 120, 0 },
  35         { 176, 144, 0 },
  36         { 320, 240, 0 },
  37         { 352, 288, 0 },
  38         { 640, 480, 0 },
  39 };
  40
  41 /* x,y -> PSZ_ */
  42 int pwc_decode_size(struct pwc_device *pdev, int width, int height)
  43 {
  44         int i, find;
  45
  46         /* Make sure we don't go beyond our max size.
  47            NB: we have different limits for RAW and normal modes. In case
  48            you don't have the decompressor loaded or use RAW mode,
  49            the maximum viewable size is smaller.
  50         */
  51         if (pdev->vpalette == VIDEO_PALETTE_RAW)
  52         {
  53                 if (width > pdev->abs_max.x || height > pdev->abs_max.y)
  54                 {
  55                         Debug("VIDEO_PALETTE_RAW: going beyond abs_max.\n");
  56                         return -1;
  57                 }
  58         }
  59         else
  60         {
  61                 if (width > pdev->view_max.x || height > pdev->view_max.y)
  62                 {
  63                         Debug("VIDEO_PALETTE_ not RAW: going beyond view_max.\n");
  64                         return -1;
  65                 }
  66         }
  67
  68         /* Find the largest size supported by the camera that fits into the
  69            requested size.
  70          */
  71         find = -1;
  72         for (i = 0; i < PSZ_MAX; i++) {
  73                 if (pdev->image_mask & (1 << i)) {
  74                         if (pwc_image_sizes[i].x <= width && pwc_image_sizes[i].y <= height)
  75                                 find = i;
  76                 }
  77         }
  78         return find;
  79 }
  80
  81 /* initialize variables depending on type and decompressor*/
  82 void pwc_construct(struct pwc_device *pdev)
  83 {
  84         switch(pdev->type) {
  85         case 645:
  86         case 646:
  87                 pdev->view_min.x = 128;
  88                 pdev->view_min.y =  96;
  89                 pdev->view_max.x = 352;
  90                 pdev->view_max.y = 288;
  91                 pdev->abs_max.x  = 352;
  92                 pdev->abs_max.y  = 288;
  93                 pdev->image_mask = 1 << PSZ_SQCIF | 1 << PSZ_QCIF | 1 << PSZ_CIF;
  94                 pdev->vcinterface = 2;
  95                 pdev->vendpoint = 4;
  96                 pdev->frame_header_size = 0;
  97                 pdev->frame_trailer_size = 0;
  98                 break;
  99         case 675:
 100         case 680:
 101         case 690:
 102                 pdev->view_min.x = 128;
 103                 pdev->view_min.y =  96;
 104                 /* Anthill bug #38: PWC always reports max size, even without PWCX */
 105                 pdev->view_max.x = 640;
 106                 pdev->view_max.y = 480;
 107                 pdev->image_mask = 1 << PSZ_SQCIF | 1 << PSZ_QSIF | 1 << PSZ_QCIF | 1 << PSZ_SIF | 1 << PSZ_CIF | 1 << PSZ_VGA;
 108                 pdev->abs_max.x = 640;
 109                 pdev->abs_max.y = 480;
 110                 pdev->vcinterface = 3;
 111                 pdev->vendpoint = 4;
 112                 pdev->frame_header_size = 0;
 113                 pdev->frame_trailer_size = 0;
 114                 break;
 115         case 720:
 116         case 730:
 117         case 740:
 118         case 750:
 119                 pdev->view_min.x = 160;
 120                 pdev->view_min.y = 120;
 121                 pdev->view_max.x = 640;
 122                 pdev->view_max.y = 480;
 123                 pdev->image_mask = 1 << PSZ_QSIF | 1 << PSZ_SIF | 1 << PSZ_VGA;
 124                 pdev->abs_max.x = 640;
 125                 pdev->abs_max.y = 480;
 126                 pdev->vcinterface = 3;
 127                 pdev->vendpoint = 5;
 128                 pdev->frame_header_size = TOUCAM_HEADER_SIZE;
 129                 pdev->frame_trailer_size = TOUCAM_TRAILER_SIZE;
 130                 break;
 131         }
 132         Debug("type = %d\n",pdev->type);
 133         pdev->vpalette = VIDEO_PALETTE_YUV420P; /* default */
 134         pdev->view_min.size = pdev->view_min.x * pdev->view_min.y;
 135         pdev->view_max.size = pdev->view_max.x * pdev->view_max.y;
 136         /* length of image, in YUV format; always allocate enough memory. */
 137         pdev->len_per_image = (pdev->abs_max.x * pdev->abs_max.y * 3) / 2;
 138 }
 139
 140