134 lines
4.1 KiB
C
134 lines
4.1 KiB
C
/* Linux driver for Philips webcam
|
|
Various miscellaneous functions and tables.
|
|
(C) 1999-2003 Nemosoft Unv.
|
|
(C) 2004-2006 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 "pwc.h"
|
|
|
|
const struct pwc_coord pwc_image_sizes[PSZ_MAX] =
|
|
{
|
|
{ 128, 96, 0 }, /* sqcif */
|
|
{ 160, 120, 0 }, /* qsif */
|
|
{ 176, 144, 0 }, /* qcif */
|
|
{ 320, 240, 0 }, /* sif */
|
|
{ 352, 288, 0 }, /* cif */
|
|
{ 640, 480, 0 }, /* vga */
|
|
};
|
|
|
|
/* 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->pixfmt != V4L2_PIX_FMT_YUV420)
|
|
{
|
|
if (width > pdev->abs_max.x || height > pdev->abs_max.y)
|
|
{
|
|
PWC_DEBUG_SIZE("VIDEO_PALETTE_RAW: going beyond abs_max.\n");
|
|
return -1;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (width > pdev->view_max.x || height > pdev->view_max.y)
|
|
{
|
|
PWC_DEBUG_SIZE("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)
|
|
{
|
|
if (DEVICE_USE_CODEC1(pdev->type)) {
|
|
|
|
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;
|
|
|
|
} else if (DEVICE_USE_CODEC3(pdev->type)) {
|
|
|
|
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;
|
|
|
|
} else /* if (DEVICE_USE_CODEC2(pdev->type)) */ {
|
|
|
|
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;
|
|
}
|
|
pdev->pixfmt = V4L2_PIX_FMT_YUV420; /* 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 = PAGE_ALIGN((pdev->abs_max.x * pdev->abs_max.y * 3) / 2);
|
|
}
|
|
|
|
|