/* 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); }