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1// SPDX-License-Identifier: GPL-2.0-or-later2/* Linux driver for Philips webcam3 Various miscellaneous functions and tables.4 (C) 1999-2003 Nemosoft Unv.5 (C) 2004-2006 Luc Saillard (luc@saillard.org)6 7 NOTE: this version of pwc is an unofficial (modified) release of pwc & pcwx8 driver and thus may have bugs that are not present in the original version.9 Please send bug reports and support requests to <luc@saillard.org>.10 The decompression routines have been implemented by reverse-engineering the11 Nemosoft binary pwcx module. Caveat emptor.12 13*/14 15 16#include "pwc.h"17 18const int pwc_image_sizes[PSZ_MAX][2] =19{20 { 128, 96 }, /* sqcif */21 { 160, 120 }, /* qsif */22 { 176, 144 }, /* qcif */23 { 320, 240 }, /* sif */24 { 352, 288 }, /* cif */25 { 640, 480 }, /* vga */26};27 28/* x,y -> PSZ_ */29int pwc_get_size(struct pwc_device *pdev, int width, int height)30{31 int i;32 33 /* Find the largest size supported by the camera that fits into the34 requested size. */35 for (i = PSZ_MAX - 1; i >= 0; i--) {36 if (!(pdev->image_mask & (1 << i)))37 continue;38 39 if (pwc_image_sizes[i][0] <= width &&40 pwc_image_sizes[i][1] <= height)41 return i;42 }43 44 /* No mode found, return the smallest mode we have */45 for (i = 0; i < PSZ_MAX; i++) {46 if (pdev->image_mask & (1 << i))47 return i;48 }49 50 /* Never reached there always is at least one supported mode */51 return 0;52}53 54/* initialize variables depending on type and decompressor */55void pwc_construct(struct pwc_device *pdev)56{57 if (DEVICE_USE_CODEC1(pdev->type)) {58 59 pdev->image_mask = 1 << PSZ_SQCIF | 1 << PSZ_QCIF | 1 << PSZ_CIF;60 pdev->vcinterface = 2;61 pdev->vendpoint = 4;62 pdev->frame_header_size = 0;63 pdev->frame_trailer_size = 0;64 65 } else if (DEVICE_USE_CODEC3(pdev->type)) {66 67 pdev->image_mask = 1 << PSZ_QSIF | 1 << PSZ_SIF | 1 << PSZ_VGA;68 pdev->vcinterface = 3;69 pdev->vendpoint = 5;70 pdev->frame_header_size = TOUCAM_HEADER_SIZE;71 pdev->frame_trailer_size = TOUCAM_TRAILER_SIZE;72 73 } else /* if (DEVICE_USE_CODEC2(pdev->type)) */ {74 75 pdev->image_mask = 1 << PSZ_SQCIF | 1 << PSZ_QSIF | 1 << PSZ_QCIF | 1 << PSZ_SIF | 1 << PSZ_CIF | 1 << PSZ_VGA;76 pdev->vcinterface = 3;77 pdev->vendpoint = 4;78 pdev->frame_header_size = 0;79 pdev->frame_trailer_size = 0;80 }81}82