pwc-misc.c

Go to the documentation of this file.

/* Linux driver for Philips webcam
   Various miscellaneous functions and tables.
   (C) 1999-2003 Nemosoft Unv.
   (C) 2004-2006 Luc Saillard ([email protected])

   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 <[email protected]>.
   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 int pwc_image_sizes[PSZ_MAX][2] =
{
    { 128,  96 }, /* sqcif */
    { 160, 120 }, /* qsif */
    { 176, 144 }, /* qcif */
    { 320, 240 }, /* sif */
    { 352, 288 }, /* cif */
    { 640, 480 }, /* vga */
};

/* x,y -> PSZ_ */
int pwc_get_size(struct pwc_device *pdev, int width, int height)
{
    int i;

    /* Find the largest size supported by the camera that fits into the
       requested size. */
    for (i = PSZ_MAX - 1; i >= 0; i--) {
        if (!(pdev->image_mask & (1 << i)))
            continue;

        if (pwc_image_sizes[i][0] <= width &&
            pwc_image_sizes[i][1] <= height)
            return i;
    }

    /* No mode found, return the smallest mode we have */
    for (i = 0; i < PSZ_MAX; i++) {
        if (pdev->image_mask & (1 << i))
            return i;
    }

    /* Never reached there always is atleast one supported mode */
    return 0;
}

/* initialize variables depending on type and decompressor */
void pwc_construct(struct pwc_device *pdev)
{
    if (DEVICE_USE_CODEC1(pdev->type)) {

        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->image_mask = 1 << PSZ_QSIF | 1 << PSZ_SIF | 1 << PSZ_VGA;
        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->image_mask = 1 << PSZ_SQCIF | 1 << PSZ_QSIF | 1 << PSZ_QCIF | 1 << PSZ_SIF | 1 << PSZ_CIF | 1 << PSZ_VGA;
        pdev->vcinterface = 3;
        pdev->vendpoint = 4;
        pdev->frame_header_size = 0;
        pdev->frame_trailer_size = 0;
    }
}