/* Linux driver for Philips webcam
Various miscellaneous functions and tables.
(C) 1999-2003 Nemosoft Unv.
(C) 2004 Luc Saillard (luc@saillard.org)
NOTE: this version of pwc is an unofficial (modified) release of pwc & pcwx
driver and thus may have bugs that are not present in the original version.
Please send bug reports and support requests to <luc@saillard.org>.
The decompression routines have been implemented by reverse-engineering the
Nemosoft binary pwcx module. Caveat emptor.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/slab.h>
#include "pwc.h"
struct pwc_coord pwc_image_sizes[PSZ_MAX] =
{
{ 128, 96, 0 },
{ 160, 120, 0 },
{ 176, 144, 0 },
{ 320, 240, 0 },
{ 352, 288, 0 },
{ 640, 480, 0 },
};
/* x,y -> PSZ_ */
int pwc_decode_size(struct pwc_device *pdev, int width, int height)
{
int i, find;
/* Make sure we don't go beyond our max size.
NB: we have different limits for RAW and normal modes. In case
you don't have the decompressor loaded or use RAW mode,
the maximum viewable size is smaller.
*/
if (pdev->vpalette == VIDEO_PALETTE_RAW)
{
if (width > pdev->abs_max.x || height > pdev->abs_max.y)
{
Debug("VIDEO_PALETTE_RAW: going beyond abs_max.\n");
return -1;
}
}
else
{
if (width > pdev->view_max.x || height > pdev->view_max.y)
{
Debug("VIDEO_PALETTE_ not RAW: going beyond view_max.\n");
return -1;
}
}
/* Find the largest size supported by the camera that fits into the
requested size.
*/
find = -1;
for (i = 0; i < PSZ_MAX; i++) {
if (pdev->image_mask & (1 << i)) {
if (pwc_image_sizes[i].x <= width && pwc_image_sizes[i].y <= height)
find = i;
}
}
return find;
}
/* initialize variables depending on type and decompressor*/
void pwc_construct(struct pwc_device *pdev)
{
switch(pdev->type) {
case 645:
case 646:
pdev->view_min.x = 128;
pdev->view_min.y = 96;
pdev->view_max.x = 352;
pdev->view_max.y = 288;
pdev->abs_max.x = 352;
pdev->abs_max.y = 288;
pdev->image_mask = 1 << PSZ_SQCIF | 1 << PSZ_QCIF | 1 << PSZ_CIF;
pdev->vcinterface = 2;
pdev->vendpoint = 4;
pdev->frame_header_size = 0;
pdev->frame_trailer_size = 0;
break;
case 675:
case 680:
case 690:
pdev->view_min.x = 128;
pdev->view_min.y = 96;
/* Anthill bug #38: PWC always reports max size, even without PWCX */
pdev->view_max.x = 640;
pdev->view_max.y = 480;
pdev->image_mask = 1 << PSZ_SQCIF | 1 << PSZ_QSIF | 1 << PSZ_QCIF | 1 << PSZ_SIF | 1 << PSZ_CIF | 1 << PSZ_VGA;
pdev->abs_max.x = 640;
pdev->abs_max.y = 480;
pdev->vcinterface = 3;
pdev->vendpoint = 4;
pdev->frame_header_size = 0;
pdev->frame_trailer_size = 0;
break;
case 720:
case 730:
case 740:
case 750:
pdev->view_min.x = 160;
pdev->view_min.y = 120;
pdev->view_max.x = 640;
pdev->view_max.y = 480;
pdev->image_mask = 1 << PSZ_QSIF | 1 << PSZ_SIF | 1 << PSZ_VGA;
pdev->abs_max.x = 640;
pdev->abs_max.y = 480;
pdev->vcinterface = 3;
pdev->vendpoint = 5;
pdev->frame_header_size = TOUCAM_HEADER_SIZE;
pdev->frame_trailer_size = TOUCAM_TRAILER_SIZE;
break;
}
Debug("type = %d\n",pdev->type);
pdev->vpalette = VIDEO_PALETTE_YUV420P; /* default */
pdev->view_min.size = pdev->view_min.x * pdev->view_min.y;
pdev->view_max.size = pdev->view_max.x * pdev->view_max.y;
/* length of image, in YUV format; always allocate enough memory. */
pdev->len_per_image = (pdev->abs_max.x * pdev->abs_max.y * 3) / 2;
}
