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/*
# PAC207 decoder
# Bertrik.Sikken. Thomas Kaiser (C) 2005
# Copyright (C) 2003 2004 2005 Michel Xhaard
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser 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
# Note this code was originally licensed under the GNU GPL instead of the
# GNU LGPL, its license has been changed with permission, see the permission
# mails at the end of this file.
*/
#include <string.h>
#include "libv4lconvert-priv.h"
#define CLIP(color) (unsigned char)(((color)>0xFF)?0xff:(((color)<0)?0:(color)))
/* FIXME not threadsafe */
static int decoder_initialized = 0;
static struct {
unsigned char is_abs;
unsigned char len;
signed char val;
} table[256];
static void init_pixart_decoder(void)
{
int i;
int is_abs, val, len;
for (i = 0; i < 256; i++) {
is_abs = 0;
val = 0;
len = 0;
if ((i & 0xC0) == 0) {
/* code 00 */
val = 0;
len = 2;
} else if ((i & 0xC0) == 0x40) {
/* code 01 */
val = -5;
len = 2;
} else if ((i & 0xC0) == 0x80) {
/* code 10 */
val = +5;
len = 2;
} else if ((i & 0xF0) == 0xC0) {
/* code 1100 */
val = -10;
len = 4;
} else if ((i & 0xF0) == 0xD0) {
/* code 1101 */
val = +10;
len = 4;
} else if ((i & 0xF8) == 0xE0) {
/* code 11100 */
val = -15;
len = 5;
} else if ((i & 0xF8) == 0xE8) {
/* code 11101 */
val = +15;
len = 5;
} else if ((i & 0xFC) == 0xF0) {
/* code 111100 */
val = -20;
len = 6;
} else if ((i & 0xFC) == 0xF4) {
/* code 111101 */
val = +20;
len = 6;
} else if ((i & 0xF8) == 0xF8) {
/* code 11111xxxxxx */
is_abs = 1;
val = 0;
len = 5;
}
table[i].is_abs = is_abs;
table[i].val = val;
table[i].len = len;
}
decoder_initialized = 1;
}
static inline unsigned char getByte(const unsigned char *inp,
unsigned int bitpos)
{
const unsigned char *addr;
addr = inp + (bitpos >> 3);
return (addr[0] << (bitpos & 7)) | (addr[1] >> (8 - (bitpos & 7)));
}
static inline unsigned short getShort(const unsigned char *pt)
{
return ((pt[0] << 8) | pt[1]);
}
static int
pac_decompress_row(const unsigned char *inp, unsigned char *outp, int width)
{
int col;
int val;
int bitpos;
unsigned char code;
if (!decoder_initialized)
init_pixart_decoder();
/* first two pixels are stored as raw 8-bit */
*outp++ = inp[2];
*outp++ = inp[3];
bitpos = 32;
/* main decoding loop */
for (col = 2; col < width; col++) {
/* get bitcode */
code = getByte(inp, bitpos);
bitpos += table[code].len;
/* calculate pixel value */
if (table[code].is_abs) {
/* absolute value: get 6 more bits */
code = getByte(inp, bitpos);
bitpos += 6;
*outp++ = code & 0xFC;
} else {
/* relative to left pixel */
val = outp[-2] + table[code].val;
*outp++ = CLIP(val);
}
}
/* return line length, rounded up to next 16-bit word */
return 2 * ((bitpos + 15) / 16);
}
void v4lconvert_decode_pac207(const unsigned char *inp, unsigned char *outp,
int width, int height)
{
/* we should received a whole frame with header and EOL marker
in myframe->data and return a GBRG pattern in frame->tmpbuffer
remove the header then copy line by line EOL is set with 0x0f 0xf0 marker
or 0x1e 0xe1 for compressed line*/
unsigned short word;
int row;
/* iterate over all rows */
for (row = 0; row < height; row++) {
word = getShort(inp);
switch (word) {
case 0x0FF0:
memcpy(outp, inp + 2, width);
inp += (2 + width);
break;
case 0x1EE1:
inp += pac_decompress_row(inp, outp, width);
break;
case 0x2DD2: /* prefix for "stronger" compressed lines, currently the
kernel driver programs the cam so that we should not
get any of these */
default: /* corrupt frame */
/* FIXME add error reporting */
return;
}
outp += width;
}
return;
}
/*
Return-Path: <thomas@kaiser-linux.li>
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Message-ID: <4862D211.3000802@kaiser-linux.li>
Date: Thu, 26 Jun 2008 01:17:37 +0200
From: Thomas Kaiser <thomas@kaiser-linux.li>
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To: Hans de Goede <j.w.r.degoede@hhs.nl>
CC: Thomas Kaiser <spca5xx@kaiser-linux.li>, bertrik@zonnet.nl,
mxhaard@magic.fr
Subject: Re: pac207 bayer decompression algorithm license question
References: <4862C0A4.3060003@hhs.nl>
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Hello Hans
Hans de Goede wrote:
> Hi,
>
> As you may have seen on the mailinglist, I've created a userspace
> library to handle cam specific format handling in userspace where it
> belongs, see:
> http://hansdegoede.livejournal.com/
Yes, I saw it on the mail list and I think it is a good idea :-)
>
> I would like to also add support for decompressing the pac207's
> compressed bayer to this lib (and remove it from the kernel driver)
> for this I need permission to relicense the decompress code under the
> LGPL (version 2 or later).
Actually, this was done by Bertrik Sikken (bertrik@zonnet.nl), Michel
Xhaard (mxhaard@magic.fr) and me. But Bertrik was the one who found out
how to decode the lines :-)
>
> Can you give me permission for this, or if the code is not yours put
> me in contact with someone who can?
For me it's no problem to release it with LGPL. Maybe you have to ask
the other one's also.
>
> Thanks & Regards,
>
> Hans
Rgeards, Thomas
*/
/*
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From: Michel Xhaard <mxhaard@magic.fr>
To: Hans de Goede <j.w.r.degoede@hhs.nl>
Subject: Re: pac207 bayer decompression algorithm license question
Date: Thu, 26 Jun 2008 11:15:32 +0200
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Cc: bertrik@zonnet.nl, spca5xx@kaiser-linux.li,
"Jean-Francois Moine" <moinejf@free.fr>
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Le jeudi 26 juin 2008 09:02, Hans de Goede a =E9crit=A0:
> Hi,
>
> As you may have seen on the mailinglist, I've created a userspace library
> to handle cam specific format handling in userspace, see:
> http://hansdegoede.livejournal.com/
>
> I would like to also add support for decompressing the pac207's compressed
> bayer to this lib (and remove it from the kernel driver) and I've heard
> from Thomas Kaiser that you are a co-author of the decompression code. In
> order to add support for decompressing pac207 compressed bayer to libv4l I
> need permission to relicense the decompression code under the LGPL (versi=
on
> 2 or later).
>
> Can you give me permission for this?
>
> Thanks & Regards,
>
> Hans
>
>
>
> p.s.
>
> Thomas has already given permission.
=46or me it is ok and a good idea for all free world familly ;-).
Bests regards
=2D-=20
Michel Xhaard
http://mxhaard.free.fr
*/
/*
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Hallo Hans,
Hans de Goede wrote:
> Hi,
>
> As you may have seen on the mailinglist, I've created a userspace
> library to
> handle cam specific format handling in userspace, see:
> http://hansdegoede.livejournal.com/
O leuk, zoiets is naar mijn idee precies wat er nodig is voor webcam
support onder linux. Ik ben een jaar of 3 geleden heel actief geweest
met een aantal webcams, maar doe er tegenwoordig helemaal niets meer
aan.
> I would like to also add support for decompressing the pac207's compressed
> bayer to this lib (and remove it from the kernel driver) and I've heard
> from Thomas Kaiser that you are a co-author of the decompression code.
> In order to add support for decompressing pac207 compressed bayer to
> libv4l I need
> permission to relicense the decompression code under the LGPL (version 2
> or later).
>
> Can you give me permission for this?
Ja, vind ik goed.
Vriendelijke groet,
Bertrik
*/
|
