LXR linux/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
  30const 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_ */
  41int 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 */
  67void 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}
  94