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/* 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->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);

}