1 /* Linux driver for Philips webcam
2    (C) 2004-2006 Luc Saillard (luc@saillard.org)
3 
4    NOTE: this version of pwc is an unofficial (modified) release of pwc & pcwx
5    driver and thus may have bugs that are not present in the original version.
6    Please send bug reports and support requests to <luc@saillard.org>.
7    The decompression routines have been implemented by reverse-engineering the
8    Nemosoft binary pwcx module. Caveat emptor.
9 
10    This program is free software; you can redistribute it and/or modify
11    it under the terms of the GNU General Public License as published by
12    the Free Software Foundation; either version 2 of the License, or
13    (at your option) any later version.
14 
15    This program is distributed in the hope that it will be useful,
16    but WITHOUT ANY WARRANTY; without even the implied warranty of
17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18    GNU General Public License for more details.
19 
20    You should have received a copy of the GNU General Public License
21    along with this program; if not, write to the Free Software
22    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
23 */
24 
25 #ifndef PWC_DEC23_H
26 #define PWC_DEC23_H
27 
28 struct pwc_device;
29 
30 struct pwc_dec23_private
31 {
32 	struct mutex lock;
33 
34 	unsigned char last_cmd, last_cmd_valid;
35 
36   unsigned int scalebits;
37   unsigned int nbitsmask, nbits; /* Number of bits of a color in the compressed stream */
38 
39   unsigned int reservoir;
40   unsigned int nbits_in_reservoir;
41 
42   const unsigned char *stream;
43   int temp_colors[16];
44 
45   unsigned char table_0004_pass1[16][1024];
46   unsigned char table_0004_pass2[16][1024];
47   unsigned char table_8004_pass1[16][256];
48   unsigned char table_8004_pass2[16][256];
49   unsigned int  table_subblock[256][12];
50 
51   unsigned char table_bitpowermask[8][256];
52   unsigned int  table_d800[256];
53   unsigned int  table_dc00[256];
54 
55 };
56 
57 void pwc_dec23_init(struct pwc_device *pdev, const unsigned char *cmd);
58 void pwc_dec23_decompress(struct pwc_device *pdev,
59 			  const void *src,
60 			  void *dst);
61 #endif
62