mirror of https://gitee.com/openkylin/linux.git
134 lines
4.1 KiB
C
134 lines
4.1 KiB
C
/* 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->pixfmt != V4L2_PIX_FMT_YUV420)
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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->pixfmt = V4L2_PIX_FMT_YUV420; /* 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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