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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [media/] [video/] [pwc/] [pwc-misc.c] - Blame information for rev 62

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Line No. Rev Author Line
1 62 marcus.erl
/* Linux driver for Philips webcam
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   Various miscellaneous functions and tables.
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   (C) 1999-2003 Nemosoft Unv.
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   (C) 2004-2006 Luc Saillard (luc@saillard.org)
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   NOTE: this version of pwc is an unofficial (modified) release of pwc & pcwx
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   driver and thus may have bugs that are not present in the original version.
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   Please send bug reports and support requests to <luc@saillard.org>.
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   The decompression routines have been implemented by reverse-engineering the
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   Nemosoft binary pwcx module. Caveat emptor.
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   This program is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 2 of the License, or
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   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with this program; if not, write to the Free Software
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   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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*/
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#include "pwc.h"
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const struct pwc_coord pwc_image_sizes[PSZ_MAX] =
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{
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        { 128,  96, 0 }, /* sqcif */
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        { 160, 120, 0 }, /* qsif */
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        { 176, 144, 0 }, /* qcif */
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        { 320, 240, 0 }, /* sif */
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        { 352, 288, 0 }, /* cif */
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        { 640, 480, 0 }, /* vga */
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};
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/* x,y -> PSZ_ */
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int pwc_decode_size(struct pwc_device *pdev, int width, int height)
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{
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        int i, find;
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        /* Make sure we don't go beyond our max size.
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           NB: we have different limits for RAW and normal modes. In case
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           you don't have the decompressor loaded or use RAW mode,
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           the maximum viewable size is smaller.
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        */
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        if (pdev->vpalette == VIDEO_PALETTE_RAW)
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        {
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                if (width > pdev->abs_max.x || height > pdev->abs_max.y)
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                {
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                        PWC_DEBUG_SIZE("VIDEO_PALETTE_RAW: going beyond abs_max.\n");
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                        return -1;
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                }
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        }
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        else
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        {
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                if (width > pdev->view_max.x || height > pdev->view_max.y)
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                {
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                        PWC_DEBUG_SIZE("VIDEO_PALETTE_not RAW: going beyond view_max.\n");
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                        return -1;
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                }
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        }
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        /* Find the largest size supported by the camera that fits into the
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           requested size.
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         */
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        find = -1;
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        for (i = 0; i < PSZ_MAX; i++) {
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                if (pdev->image_mask & (1 << i)) {
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                        if (pwc_image_sizes[i].x <= width && pwc_image_sizes[i].y <= height)
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                                find = i;
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                }
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        }
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        return find;
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}
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/* initialize variables depending on type and decompressor*/
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void pwc_construct(struct pwc_device *pdev)
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{
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        if (DEVICE_USE_CODEC1(pdev->type)) {
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                pdev->view_min.x = 128;
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                pdev->view_min.y =  96;
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                pdev->view_max.x = 352;
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                pdev->view_max.y = 288;
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                pdev->abs_max.x  = 352;
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                pdev->abs_max.y  = 288;
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                pdev->image_mask = 1 << PSZ_SQCIF | 1 << PSZ_QCIF | 1 << PSZ_CIF;
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                pdev->vcinterface = 2;
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                pdev->vendpoint = 4;
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                pdev->frame_header_size = 0;
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                pdev->frame_trailer_size = 0;
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        } else if (DEVICE_USE_CODEC3(pdev->type)) {
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                pdev->view_min.x = 160;
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                pdev->view_min.y = 120;
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                pdev->view_max.x = 640;
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                pdev->view_max.y = 480;
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                pdev->image_mask = 1 << PSZ_QSIF | 1 << PSZ_SIF | 1 << PSZ_VGA;
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                pdev->abs_max.x = 640;
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                pdev->abs_max.y = 480;
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                pdev->vcinterface = 3;
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                pdev->vendpoint = 5;
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                pdev->frame_header_size = TOUCAM_HEADER_SIZE;
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                pdev->frame_trailer_size = TOUCAM_TRAILER_SIZE;
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        } else /* if (DEVICE_USE_CODEC2(pdev->type)) */ {
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                pdev->view_min.x = 128;
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                pdev->view_min.y =  96;
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                /* Anthill bug #38: PWC always reports max size, even without PWCX */
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                pdev->view_max.x = 640;
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                pdev->view_max.y = 480;
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                pdev->image_mask = 1 << PSZ_SQCIF | 1 << PSZ_QSIF | 1 << PSZ_QCIF | 1 << PSZ_SIF | 1 << PSZ_CIF | 1 << PSZ_VGA;
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                pdev->abs_max.x = 640;
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                pdev->abs_max.y = 480;
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                pdev->vcinterface = 3;
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                pdev->vendpoint = 4;
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                pdev->frame_header_size = 0;
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                pdev->frame_trailer_size = 0;
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        }
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        pdev->vpalette = VIDEO_PALETTE_YUV420P; /* default */
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        pdev->view_min.size = pdev->view_min.x * pdev->view_min.y;
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        pdev->view_max.size = pdev->view_max.x * pdev->view_max.y;
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        /* length of image, in YUV format; always allocate enough memory. */
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        pdev->len_per_image = PAGE_ALIGN((pdev->abs_max.x * pdev->abs_max.y * 3) / 2);
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}
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