drivers/media/usb/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 int pwc_image_sizes[PSZ_MAX][2] =
  31 {
  32         { 128,  96 }, /* sqcif */
  33         { 160, 120 }, /* qsif */
  34         { 176, 144 }, /* qcif */
  35         { 320, 240 }, /* sif */
  36         { 352, 288 }, /* cif */
  37         { 640, 480 }, /* vga */
  38 };
  39
  40 /* x,y -> PSZ_ */
  41 int pwc_get_size(struct pwc_device *pdev, int width, int height)
  42 {
  43         int i;
  44
  45         /* Find the largest size supported by the camera that fits into the
  46            requested size. */
  47         for (i = PSZ_MAX - 1; i >= 0; i--) {
  48                 if (!(pdev->image_mask & (1 << i)))
  49                         continue;
  50
  51                 if (pwc_image_sizes[i][0] <= width &&
  52                     pwc_image_sizes[i][1] <= height)
  53                         return i;
  54         }
  55
  56         /* No mode found, return the smallest mode we have */
  57         for (i = 0; i < PSZ_MAX; i++) {
  58                 if (pdev->image_mask & (1 << i))
  59                         return i;
  60         }
  61
  62         /* Never reached there always is atleast one supported mode */
  63         return 0;
  64 }
  65
  66 /* initialize variables depending on type and decompressor */
  67 void pwc_construct(struct pwc_device *pdev)
  68 {
  69         if (DEVICE_USE_CODEC1(pdev->type)) {
  70
  71                 pdev->image_mask = 1 << PSZ_SQCIF | 1 << PSZ_QCIF | 1 << PSZ_CIF;
  72                 pdev->vcinterface = 2;
  73                 pdev->vendpoint = 4;
  74                 pdev->frame_header_size = 0;
  75                 pdev->frame_trailer_size = 0;
  76
  77         } else if (DEVICE_USE_CODEC3(pdev->type)) {
  78
  79                 pdev->image_mask = 1 << PSZ_QSIF | 1 << PSZ_SIF | 1 << PSZ_VGA;
  80                 pdev->vcinterface = 3;
  81                 pdev->vendpoint = 5;
  82                 pdev->frame_header_size = TOUCAM_HEADER_SIZE;
  83                 pdev->frame_trailer_size = TOUCAM_TRAILER_SIZE;
  84
  85         } else /* if (DEVICE_USE_CODEC2(pdev->type)) */ {
  86
  87                 pdev->image_mask = 1 << PSZ_SQCIF | 1 << PSZ_QSIF | 1 << PSZ_QCIF | 1 << PSZ_SIF | 1 << PSZ_CIF | 1 << PSZ_VGA;
  88                 pdev->vcinterface = 3;
  89                 pdev->vendpoint = 4;
  90                 pdev->frame_header_size = 0;
  91                 pdev->frame_trailer_size = 0;
  92         }
  93 }