LXR linux/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
  30const 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_ */
  41int 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*/
  81void 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
 134