diff options
Diffstat (limited to 'v4l2-apps/libv4l/libv4lconvert/pac207.c')
| -rw-r--r-- | v4l2-apps/libv4l/libv4lconvert/pac207.c | 418 |
1 files changed, 418 insertions, 0 deletions
diff --git a/v4l2-apps/libv4l/libv4lconvert/pac207.c b/v4l2-apps/libv4l/libv4lconvert/pac207.c new file mode 100644 index 000000000..97ef4ebc0 --- /dev/null +++ b/v4l2-apps/libv4l/libv4lconvert/pac207.c @@ -0,0 +1,418 @@ +/* + +# 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> +Received: from koko.hhs.nl ([145.52.2.16] verified) + by hhs.nl (CommuniGate Pro SMTP 4.3.6) + with ESMTP id 88906346 for j.w.r.degoede@hhs.nl; Thu, 26 Jun 2008 01:17:00 +0200 +Received: from exim (helo=koko) + by koko.hhs.nl with local-smtp (Exim 4.62) + (envelope-from <thomas@kaiser-linux.li>) + id 1KBeEW-0001qu-H6 + for j.w.r.degoede@hhs.nl; Thu, 26 Jun 2008 01:17:00 +0200 +Received: from [192.87.102.74] (port=41049 helo=filter6-ams.mf.surf.net) + by koko.hhs.nl with esmtp (Exim 4.62) + (envelope-from <thomas@kaiser-linux.li>) + id 1KBeEV-0001qn-2T + for j.w.r.degoede@hhs.nl; Thu, 26 Jun 2008 01:17:00 +0200 +Received: from smtp0.lie-comtel.li (smtp0.lie-comtel.li [217.173.238.80]) + by filter6-ams.mf.surf.net (8.13.8/8.13.8/Debian-3) with ESMTP id m5PNGwSF007539 + for <j.w.r.degoede@hhs.nl>; Thu, 26 Jun 2008 01:16:58 +0200 +Received: from localhost (localhost.lie-comtel.li [127.0.0.1]) + by smtp0.lie-comtel.li (Postfix) with ESMTP id DDB609FEC1D; + Thu, 26 Jun 2008 00:16:56 +0100 (GMT-1) +X-Virus-Scanned: Virus scanned by amavis at smtp.lie-comtel.li +Received: from [192.168.0.16] (217-173-228-198.cmts.powersurf.li [217.173.228.198]) + by smtp0.lie-comtel.li (Postfix) with ESMTP id 80B589FEC19; + Thu, 26 Jun 2008 00:16:56 +0100 (GMT-1) +Message-ID: <4862D211.3000802@kaiser-linux.li> +Date: Thu, 26 Jun 2008 01:17:37 +0200 +From: Thomas Kaiser <thomas@kaiser-linux.li> +User-Agent: Thunderbird 2.0.0.14 (X11/20080505) +MIME-Version: 1.0 +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> +In-Reply-To: <4862C0A4.3060003@hhs.nl> +Content-Type: text/plain; charset=ISO-8859-1; format=flowed +Content-Transfer-Encoding: 7bit +X-Canit-CHI2: 0.00 +X-Bayes-Prob: 0.0001 (Score 0, tokens from: @@RPTN) +X-Spam-Score: 0.00 () [Tag at 8.00] +X-CanItPRO-Stream: hhs:j.w.r.degoede@hhs.nl (inherits from hhs:default,base:default) +X-Canit-Stats-ID: 88604132 - 38b3b44cd798 +X-Scanned-By: CanIt (www . roaringpenguin . com) on 192.87.102.74 +X-Anti-Virus: Kaspersky Anti-Virus for MailServers 5.5.2/RELEASE, bases: 25062008 #787666, status: clean + +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 +*/ + +/* +Return-Path: <mxhaard@magic.fr> +Received: from koko.hhs.nl ([145.52.2.16] verified) + by hhs.nl (CommuniGate Pro SMTP 4.3.6) + with ESMTP id 88910192 for j.w.r.degoede@hhs.nl; Thu, 26 Jun 2008 09:15:37 +0200 +Received: from exim (helo=koko) + by koko.hhs.nl with local-smtp (Exim 4.62) + (envelope-from <mxhaard@magic.fr>) + id 1KBlhh-0006Fi-Oe + for j.w.r.degoede@hhs.nl; Thu, 26 Jun 2008 09:15:37 +0200 +Received: from [194.171.167.220] (port=54180 helo=filter4-til.mf.surf.net) + by koko.hhs.nl with esmtp (Exim 4.62) + (envelope-from <mxhaard@magic.fr>) + id 1KBlhh-0006Fd-FY + for j.w.r.degoede@hhs.nl; Thu, 26 Jun 2008 09:15:37 +0200 +Received: from smtp4-g19.free.fr (smtp4-g19.free.fr [212.27.42.30]) + by filter4-til.mf.surf.net (8.13.8/8.13.8/Debian-3) with ESMTP id m5Q7FY1I006360 + for <j.w.r.degoede@hhs.nl>; Thu, 26 Jun 2008 09:15:34 +0200 +Received: from smtp4-g19.free.fr (localhost.localdomain [127.0.0.1]) + by smtp4-g19.free.fr (Postfix) with ESMTP id 51C683EA0E7; + Thu, 26 Jun 2008 09:15:34 +0200 (CEST) +Received: from [192.168.1.11] (lns-bzn-54-82-251-105-53.adsl.proxad.net [82.251.105.53]) + by smtp4-g19.free.fr (Postfix) with ESMTP id 1149E3EA0C7; + Thu, 26 Jun 2008 09:15:34 +0200 (CEST) +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 +User-Agent: KMail/1.9.5 +Cc: bertrik@zonnet.nl, spca5xx@kaiser-linux.li, + "Jean-Francois Moine" <moinejf@free.fr> +References: <48633F02.3040108@hhs.nl> +In-Reply-To: <48633F02.3040108@hhs.nl> +MIME-Version: 1.0 +Content-Type: text/plain; + charset="iso-8859-1" +Content-Transfer-Encoding: quoted-printable +Content-Disposition: inline +Message-Id: <200806261115.32909.mxhaard@magic.fr> +X-Canit-CHI2: 0.00 +X-Bayes-Prob: 0.0001 (Score 0, tokens from: @@RPTN) +X-Spam-Score: 0.00 () [Tag at 8.00] +X-CanItPRO-Stream: hhs:j.w.r.degoede@hhs.nl (inherits from hhs:default,base:default) +X-Canit-Stats-ID: 88656338 - 0dde233cb8b5 +X-Scanned-By: CanIt (www . roaringpenguin . com) on 194.171.167.220 +X-Anti-Virus: Kaspersky Anti-Virus for MailServers 5.5.2/RELEASE, bases: 26062008 #787720, status: clean + +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 +*/ + +/* +Return-Path: <bertrik@sikken.nl> +Received: from koko.hhs.nl ([145.52.2.16] verified) + by hhs.nl (CommuniGate Pro SMTP 4.3.6) + with ESMTP id 88940205 for j.w.r.degoede@hhs.nl; Thu, 26 Jun 2008 22:03:30 +0200 +Received: from exim (helo=koko) + by koko.hhs.nl with local-smtp (Exim 4.62) + (envelope-from <bertrik@sikken.nl>) + id 1KBxgo-0003Dj-ET + for j.w.r.degoede@hhs.nl; Thu, 26 Jun 2008 22:03:30 +0200 +Received: from [192.87.102.69] (port=51992 helo=filter1-ams.mf.surf.net) + by koko.hhs.nl with esmtp (Exim 4.62) + (envelope-from <bertrik@sikken.nl>) + id 1KBxgo-0003Dd-5i + for j.w.r.degoede@hhs.nl; Thu, 26 Jun 2008 22:03:30 +0200 +Received: from pelian.kabelfoon.nl (pelian3.kabelfoon.nl [62.45.45.106]) + by filter1-ams.mf.surf.net (8.13.8/8.13.8/Debian-3) with ESMTP id m5QK3ThE007720 + for <j.w.r.degoede@hhs.nl>; Thu, 26 Jun 2008 22:03:29 +0200 +Received: from [192.168.1.1] (062-015-045-062.dynamic.caiway.nl [62.45.15.62]) + by pelian.kabelfoon.nl (Postfix) with ESMTP id 9239B428100 + for <j.w.r.degoede@hhs.nl>; Thu, 26 Jun 2008 22:03:29 +0200 (CEST) +Message-ID: <4863F611.80104@sikken.nl> +Date: Thu, 26 Jun 2008 22:03:29 +0200 +From: Bertrik Sikken <bertrik@sikken.nl> +User-Agent: Thunderbird 2.0.0.14 (Windows/20080421) +MIME-Version: 1.0 +To: Hans de Goede <j.w.r.degoede@hhs.nl> +Subject: Re: pac207 bayer decompression algorithm license question +References: <48633F02.3040108@hhs.nl> +In-Reply-To: <48633F02.3040108@hhs.nl> +X-Enigmail-Version: 0.95.6 +Content-Type: text/plain; charset=ISO-8859-1; format=flowed +Content-Transfer-Encoding: 7bit +X-Canit-CHI2: 0.00 +X-Bayes-Prob: 0.0001 (Score 0, tokens from: @@RPTN) +X-Spam-Score: 0.00 () [Tag at 8.00] +X-CanItPRO-Stream: hhs:j.w.r.degoede@hhs.nl (inherits from hhs:default,base:default) +X-Canit-Stats-ID: 88938005 - ef1f0836ffc7 +X-Scanned-By: CanIt (www . roaringpenguin . com) on 192.87.102.69 +X-Anti-Virus: Kaspersky Anti-Virus for MailServers 5.5.2/RELEASE, bases: 26062008 #787877, status: clean + +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 +*/ |