/* Linux driver for Philips webcam
Decompression for chipset version 2 et 3
(C) 2004-2006 Luc Saillard (luc@saillard.org)
NOTE: this version of pwc is an unofficial (modified) release of pwc & pcwx
driver and thus may have bugs that are not present in the original version.
Please send bug reports and support requests to <luc@saillard.org>.
The decompression routines have been implemented by reverse-engineering the
Nemosoft binary pwcx module. Caveat emptor.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "pwc-timon.h"
#include "pwc-kiara.h"
#include "pwc-dec23.h"
#include <media/pwc-ioctl.h>
#include <linux/string.h>
/*
* USE_LOOKUP_TABLE_TO_CLAMP
* 0: use a C version of this tests: { a<0?0:(a>255?255:a) }
* 1: use a faster lookup table for cpu with a big cache (intel)
*/
#define USE_LOOKUP_TABLE_TO_CLAMP 1
/*
* UNROLL_LOOP_FOR_COPYING_BLOCK
* 0: use a loop for a smaller code (but little slower)
* 1: when unrolling the loop, gcc produces some faster code (perhaps only
* valid for intel processor class). Activating this option, automaticaly
* activate USE_LOOKUP_TABLE_TO_CLAMP
*/
#define UNROLL_LOOP_FOR_COPY 1
#if UNROLL_LOOP_FOR_COPY
# undef USE_LOOKUP_TABLE_TO_CLAMP
# define USE_LOOKUP_TABLE_TO_CLAMP 1
#endif
/*
* ENABLE_BAYER_DECODER
* 0: bayer decoder is not build (save some space)
* 1: bayer decoder is build and can be used
*/
#define ENABLE_BAYER_DECODER 0
static void build_subblock_pattern(struct pwc_dec23_private *pdec)
{
static const unsigned int initial_values[12] = {
-0x526500, -0x221200, 0x221200, 0x526500,
-0x3de200, 0x3de200,
-0x6db480, -0x2d5d00, 0x2d5d00, 0x6db480,
-0x12c200, 0x12c200
};
static const unsigned int values_derivated[12] = {
0xa4ca, 0x4424, -0x4424, -0xa4ca,
0x7bc4, -0x7bc4,
0xdb69, 0x5aba, -0x5aba, -0xdb69,
0x2584, -0x2584
};
unsigned int temp_values[12];
int i, j;
memcpy(temp_values, initial_values, sizeof(initial_values));
for (i = 0; i < 256; i++) {
for (j = 0; j < 12; j++) {
pdec->table_subblock[i][j] = temp_values[j];
temp_values[j] += values_derivated[j];
}
}
}
static void build_bit_powermask_table(struct pwc_dec23_private *pdec)
{
unsigned char *p;
unsigned int bit, byte, mask, val;
unsigned int bitpower = 1;
for (bit = 0; bit < 8; bit++) {
mask = bitpower - 1;
p = pdec->table_bitpowermask[bit];
for (byte = 0; byte < 256; byte++) {
val = (byte & mask);
if (byte & bitpower)
val = -val;
*p++ = val;
}
bitpower<<=1;
}
}
static void build_table_color(const unsigned int romtable[16][8],
unsigned char p0004[16][1024],
unsigned char p8004[16][256])
{
int compression_mode, j, k, bit, pw;
unsigned char *p0, *p8;
const unsigned int *r;
/* We have 16 compressions tables */
for (compression_mode = 0; compression_mode < 16; compression_mode++) {
p0 = p0004[compression_mode];
p8 = p8004[compression_mode];
r = romtable[compression_mode];
for (j = 0; j < 8; j++, r++, p0 += 128) {
for (k = 0; k < 16; k++) {
if (k == 0)
bit = 1;
else if (k >= 1 && k < 3)
bit = (r[0] >> 15) & 7;
else if (k >= 3 && k < 6)
bit = (r[0] >> 12) & 7;
else if (k >= 6 && k < 10)
bit = (r[0] >> 9) & 7;
else if (k >= 10 && k < 13)
bit = (r[0] >> 6) & 7;
else if (k >= 13 && k < 15)
bit = (r[0] >> 3) & 7;
else
bit = (r[0]) & 7;