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1da177e4 LT |
1 | /* Linux driver for Philips webcam |
2 | Various miscellaneous functions and tables. | |
3 | (C) 1999-2003 Nemosoft Unv. | |
4 | (C) 2004 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 | #include <linux/slab.h> | |
28 | ||
29 | #include "pwc.h" | |
30 | ||
31 | struct pwc_coord pwc_image_sizes[PSZ_MAX] = | |
32 | { | |
33 | { 128, 96, 0 }, | |
34 | { 160, 120, 0 }, | |
35 | { 176, 144, 0 }, | |
36 | { 320, 240, 0 }, | |
37 | { 352, 288, 0 }, | |
38 | { 640, 480, 0 }, | |
39 | }; | |
40 | ||
41 | /* x,y -> PSZ_ */ | |
42 | int pwc_decode_size(struct pwc_device *pdev, int width, int height) | |
43 | { | |
44 | int i, find; | |
45 | ||
46 | /* Make sure we don't go beyond our max size. | |
47 | NB: we have different limits for RAW and normal modes. In case | |
48 | you don't have the decompressor loaded or use RAW mode, | |
49 | the maximum viewable size is smaller. | |
50 | */ | |
51 | if (pdev->vpalette == VIDEO_PALETTE_RAW) | |
52 | { | |
53 | if (width > pdev->abs_max.x || height > pdev->abs_max.y) | |
54 | { | |
55 | Debug("VIDEO_PALETTE_RAW: going beyond abs_max.\n"); | |
56 | return -1; | |
57 | } | |
58 | } | |
59 | else | |
60 | { | |
61 | if (width > pdev->view_max.x || height > pdev->view_max.y) | |
62 | { | |
63 | Debug("VIDEO_PALETTE_ not RAW: going beyond view_max.\n"); | |
64 | return -1; | |
65 | } | |
66 | } | |
67 | ||
68 | /* Find the largest size supported by the camera that fits into the | |
69 | requested size. | |
70 | */ | |
71 | find = -1; | |
72 | for (i = 0; i < PSZ_MAX; i++) { | |
73 | if (pdev->image_mask & (1 << i)) { | |
74 | if (pwc_image_sizes[i].x <= width && pwc_image_sizes[i].y <= height) | |
75 | find = i; | |
76 | } | |
77 | } | |
78 | return find; | |
79 | } | |
80 | ||
81 | /* initialize variables depending on type and decompressor*/ | |
82 | void pwc_construct(struct pwc_device *pdev) | |
83 | { | |
84 | switch(pdev->type) { | |
85 | case 645: | |
86 | case 646: | |
87 | pdev->view_min.x = 128; | |
88 | pdev->view_min.y = 96; | |
89 | pdev->view_max.x = 352; | |
90 | pdev->view_max.y = 288; | |
91 | pdev->abs_max.x = 352; | |
92 | pdev->abs_max.y = 288; | |
93 | pdev->image_mask = 1 << PSZ_SQCIF | 1 << PSZ_QCIF | 1 << PSZ_CIF; | |
94 | pdev->vcinterface = 2; | |
95 | pdev->vendpoint = 4; | |
96 | pdev->frame_header_size = 0; | |
97 | pdev->frame_trailer_size = 0; | |
98 | break; | |
99 | case 675: | |
100 | case 680: | |
101 | case 690: | |
102 | pdev->view_min.x = 128; | |
103 | pdev->view_min.y = 96; | |
104 | /* Anthill bug #38: PWC always reports max size, even without PWCX */ | |
105 | pdev->view_max.x = 640; | |
106 | pdev->view_max.y = 480; | |
107 | pdev->image_mask = 1 << PSZ_SQCIF | 1 << PSZ_QSIF | 1 << PSZ_QCIF | 1 << PSZ_SIF | 1 << PSZ_CIF | 1 << PSZ_VGA; | |
108 | pdev->abs_max.x = 640; | |
109 | pdev->abs_max.y = 480; | |
110 | pdev->vcinterface = 3; | |
111 | pdev->vendpoint = 4; | |
112 | pdev->frame_header_size = 0; | |
113 | pdev->frame_trailer_size = 0; | |
114 | break; | |
115 | case 720: | |
116 | case 730: | |
117 | case 740: | |
118 | case 750: | |
119 | pdev->view_min.x = 160; | |
120 | pdev->view_min.y = 120; | |
121 | pdev->view_max.x = 640; | |
122 | pdev->view_max.y = 480; | |
123 | pdev->image_mask = 1 << PSZ_QSIF | 1 << PSZ_SIF | 1 << PSZ_VGA; | |
124 | pdev->abs_max.x = 640; | |
125 | pdev->abs_max.y = 480; | |
126 | pdev->vcinterface = 3; | |
127 | pdev->vendpoint = 5; | |
128 | pdev->frame_header_size = TOUCAM_HEADER_SIZE; | |
129 | pdev->frame_trailer_size = TOUCAM_TRAILER_SIZE; | |
130 | break; | |
131 | } | |
132 | Debug("type = %d\n",pdev->type); | |
133 | pdev->vpalette = VIDEO_PALETTE_YUV420P; /* default */ | |
134 | pdev->view_min.size = pdev->view_min.x * pdev->view_min.y; | |
135 | pdev->view_max.size = pdev->view_max.x * pdev->view_max.y; | |
136 | /* length of image, in YUV format; always allocate enough memory. */ | |
137 | pdev->len_per_image = (pdev->abs_max.x * pdev->abs_max.y * 3) / 2; | |
138 | } | |
139 | ||
140 |