/* 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 <linux/slab.h>#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->vpalette == VIDEO_PALETTE_RAW)	{		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->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 = PAGE_ALIGN((pdev->abs_max.x * pdev->abs_max.y * 3) / 2);}