82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/* 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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*/
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#include "pwc.h"
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const int pwc_image_sizes[PSZ_MAX][2] =
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{
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{ 128, 96 }, /* sqcif */
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{ 160, 120 }, /* qsif */
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{ 176, 144 }, /* qcif */
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{ 320, 240 }, /* sif */
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{ 352, 288 }, /* cif */
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{ 640, 480 }, /* vga */
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};
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/* x,y -> PSZ_ */
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int pwc_get_size(struct pwc_device *pdev, int width, int height)
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{
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int i;
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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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for (i = PSZ_MAX - 1; i >= 0; i--) {
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if (!(pdev->image_mask & (1 << i)))
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continue;
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if (pwc_image_sizes[i][0] <= width &&
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pwc_image_sizes[i][1] <= height)
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return i;
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}
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/* No mode found, return the smallest mode we have */
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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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return i;
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}
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/* Never reached there always is at least one supported mode */
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return 0;
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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->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->image_mask = 1 << PSZ_QSIF | 1 << PSZ_SIF | 1 << PSZ_VGA;
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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->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->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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}
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