1 /* Linux driver for Philips webcam 2 Various miscellaneous functions and tables. 3 (C) 1999-2003 Nemosoft Unv. 4 (C) 2004-2006 Luc Saillard (luc@saillard.org) 5 6 NOTE: this version of pwc is an unofficial (modified) release of pwc & pcwx 7 driver and thus may have bugs that are not present in the original version. 8 Please send bug reports and support requests to <luc@saillard.org>. 9 The decompression routines have been implemented by reverse-engineering the 10 Nemosoft binary pwcx module. Caveat emptor. 11 12 This program is free software; you can redistribute it and/or modify 13 it under the terms of the GNU General Public License as published by 14 the Free Software Foundation; either version 2 of the License, or 15 (at your option) any later version. 16 17 This program is distributed in the hope that it will be useful, 18 but WITHOUT ANY WARRANTY; without even the implied warranty of 19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 GNU General Public License for more details. 21 22 You should have received a copy of the GNU General Public License 23 along with this program; if not, write to the Free Software 24 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 25 */ 26 27 28 #include "pwc.h" 29 30 const int pwc_image_sizes[PSZ_MAX][2] = 31 { 32 { 128, 96 }, /* sqcif */ 33 { 160, 120 }, /* qsif */ 34 { 176, 144 }, /* qcif */ 35 { 320, 240 }, /* sif */ 36 { 352, 288 }, /* cif */ 37 { 640, 480 }, /* vga */ 38 }; 39 40 /* x,y -> PSZ_ */ 41 int pwc_get_size(struct pwc_device *pdev, int width, int height) 42 { 43 int i; 44 45 /* Find the largest size supported by the camera that fits into the 46 requested size. */ 47 for (i = PSZ_MAX - 1; i >= 0; i--) { 48 if (!(pdev->image_mask & (1 << i))) 49 continue; 50 51 if (pwc_image_sizes[i][0] <= width && 52 pwc_image_sizes[i][1] <= height) 53 return i; 54 } 55 56 /* No mode found, return the smallest mode we have */ 57 for (i = 0; i < PSZ_MAX; i++) { 58 if (pdev->image_mask & (1 << i)) 59 return i; 60 } 61 62 /* Never reached there always is at least one supported mode */ 63 return 0; 64 } 65 66 /* initialize variables depending on type and decompressor */ 67 void pwc_construct(struct pwc_device *pdev) 68 { 69 if (DEVICE_USE_CODEC1(pdev->type)) { 70 71 pdev->image_mask = 1 << PSZ_SQCIF | 1 << PSZ_QCIF | 1 << PSZ_CIF; 72 pdev->vcinterface = 2; 73 pdev->vendpoint = 4; 74 pdev->frame_header_size = 0; 75 pdev->frame_trailer_size = 0; 76 77 } else if (DEVICE_USE_CODEC3(pdev->type)) { 78 79 pdev->image_mask = 1 << PSZ_QSIF | 1 << PSZ_SIF | 1 << PSZ_VGA; 80 pdev->vcinterface = 3; 81 pdev->vendpoint = 5; 82 pdev->frame_header_size = TOUCAM_HEADER_SIZE; 83 pdev->frame_trailer_size = TOUCAM_TRAILER_SIZE; 84 85 } else /* if (DEVICE_USE_CODEC2(pdev->type)) */ { 86 87 pdev->image_mask = 1 << PSZ_SQCIF | 1 << PSZ_QSIF | 1 << PSZ_QCIF | 1 << PSZ_SIF | 1 << PSZ_CIF | 1 << PSZ_VGA; 88 pdev->vcinterface = 3; 89 pdev->vendpoint = 4; 90 pdev->frame_header_size = 0; 91 pdev->frame_trailer_size = 0; 92 } 93 } 94