diff options
Diffstat (limited to 'drivers/media/video/pwc/pwc-misc.c')
| -rw-r--r-- | drivers/media/video/pwc/pwc-misc.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/drivers/media/video/pwc/pwc-misc.c b/drivers/media/video/pwc/pwc-misc.c new file mode 100644 index 000000000000..58fe79747992 --- /dev/null +++ b/drivers/media/video/pwc/pwc-misc.c @@ -0,0 +1,140 @@ +/* Linux driver for Philips webcam + Various miscellaneous functions and tables. + (C) 1999-2003 Nemosoft Unv. + (C) 2004 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" + +struct pwc_coord pwc_image_sizes[PSZ_MAX] = +{ + { 128, 96, 0 }, + { 160, 120, 0 }, + { 176, 144, 0 }, + { 320, 240, 0 }, + { 352, 288, 0 }, + { 640, 480, 0 }, +}; + +/* 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) + { + Debug("VIDEO_PALETTE_RAW: going beyond abs_max.\n"); + return -1; + } + } + else + { + if (width > pdev->view_max.x || height > pdev->view_max.y) + { + Debug("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) +{ + switch(pdev->type) { + case 645: + case 646: + 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; + break; + case 675: + case 680: + case 690: + 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; + break; + case 720: + case 730: + case 740: + case 750: + 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; + break; + } + Debug("type = %d\n",pdev->type); + 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 = (pdev->abs_max.x * pdev->abs_max.y * 3) / 2; +} + + |