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) 2004-2006 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
  28 #include "pwc.h"
  29
  30 const struct pwc_coord pwc_image_sizes[PSZ_MAX] =
  31 {
  32         { 128,  96, 0 }, /* sqcif */
  33         { 160, 120, 0 }, /* qsif */
  34         { 176, 144, 0 }, /* qcif */
  35         { 320, 240, 0 }, /* sif */
  36         { 352, 288, 0 }, /* cif */
  37         { 640, 480, 0 }, /* vga */
  38 };
  39
  40 /* x,y -> PSZ_ */
  41 int pwc_decode_size(struct pwc_device *pdev, int width, int height)
  42 {
  43         int i, find;
  44
  45         /* Make sure we don't go beyond our max size.
  46            NB: we have different limits for RAW and normal modes. In case
  47            you don't have the decompressor loaded or use RAW mode,
  48            the maximum viewable size is smaller.
  49         */
  50         if (pdev->vpalette == VIDEO_PALETTE_RAW)
  51         {
  52                 if (width > pdev->abs_max.x || height > pdev->abs_max.y)
  53                 {
  54                         PWC_DEBUG_SIZE("VIDEO_PALETTE_RAW: going beyond abs_max.\n");
  55                         return -1;
  56                 }
  57         }
  58         else
  59         {
  60                 if (width > pdev->view_max.x || height > pdev->view_max.y)
  61                 {
  62                         PWC_DEBUG_SIZE("VIDEO_PALETTE_not RAW: going beyond view_max.\n");
  63                         return -1;
  64                 }
  65         }
  66
  67         /* Find the largest size supported by the camera that fits into the
  68            requested size.
  69          */
  70         find = -1;
  71         for (i = 0; i < PSZ_MAX; i++) {
  72                 if (pdev->image_mask & (1 << i)) {
  73                         if (pwc_image_sizes[i].x <= width && pwc_image_sizes[i].y <= height)
  74                                 find = i;
  75                 }
  76         }
  77         return find;
  78 }
  79
  80 /* initialize variables depending on type and decompressor*/
  81 void pwc_construct(struct pwc_device *pdev)
  82 {
  83         if (DEVICE_USE_CODEC1(pdev->type)) {
  84
  85                 pdev->view_min.x = 128;
  86                 pdev->view_min.y =  96;
  87                 pdev->view_max.x = 352;
  88                 pdev->view_max.y = 288;
  89                 pdev->abs_max.x  = 352;
  90                 pdev->abs_max.y  = 288;
  91                 pdev->image_mask = 1 << PSZ_SQCIF | 1 << PSZ_QCIF | 1 << PSZ_CIF;
  92                 pdev->vcinterface = 2;
  93                 pdev->vendpoint = 4;
  94                 pdev->frame_header_size = 0;
  95                 pdev->frame_trailer_size = 0;
  96
  97         } else if (DEVICE_USE_CODEC3(pdev->type)) {
  98
  99                 pdev->view_min.x = 160;
 100                 pdev->view_min.y = 120;
 101                 pdev->view_max.x = 640;
 102                 pdev->view_max.y = 480;
 103                 pdev->image_mask = 1 << PSZ_QSIF | 1 << PSZ_SIF | 1 << PSZ_VGA;
 104                 pdev->abs_max.x = 640;
 105                 pdev->abs_max.y = 480;
 106                 pdev->vcinterface = 3;
 107                 pdev->vendpoint = 5;
 108                 pdev->frame_header_size = TOUCAM_HEADER_SIZE;
 109                 pdev->frame_trailer_size = TOUCAM_TRAILER_SIZE;
 110
 111         } else /* if (DEVICE_USE_CODEC2(pdev->type)) */ {
 112
 113                 pdev->view_min.x = 128;
 114                 pdev->view_min.y =  96;
 115                 /* Anthill bug #38: PWC always reports max size, even without PWCX */
 116                 pdev->view_max.x = 640;
 117                 pdev->view_max.y = 480;
 118                 pdev->image_mask = 1 << PSZ_SQCIF | 1 << PSZ_QSIF | 1 << PSZ_QCIF | 1 << PSZ_SIF | 1 << PSZ_CIF | 1 << PSZ_VGA;
 119                 pdev->abs_max.x = 640;
 120                 pdev->abs_max.y = 480;
 121                 pdev->vcinterface = 3;
 122                 pdev->vendpoint = 4;
 123                 pdev->frame_header_size = 0;
 124                 pdev->frame_trailer_size = 0;
 125         }
 126         pdev->vpalette = VIDEO_PALETTE_YUV420P; /* default */
 127         pdev->view_min.size = pdev->view_min.x * pdev->view_min.y;
 128         pdev->view_max.size = pdev->view_max.x * pdev->view_max.y;
 129         /* length of image, in YUV format; always allocate enough memory. */
 130         pdev->len_per_image = PAGE_ALIGN((pdev->abs_max.x * pdev->abs_max.y * 3) / 2);
 131 }
 132
 133