/* # 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 #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: 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 ) 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 ) 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 ; 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 User-Agent: Thunderbird 2.0.0.14 (X11/20080505) MIME-Version: 1.0 To: Hans de Goede CC: Thomas Kaiser , 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: 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 ) 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 ) 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 ; 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 To: Hans de Goede 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" 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: 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 ) 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 ) 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 ; 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 ; 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 User-Agent: Thunderbird 2.0.0.14 (Windows/20080421) MIME-Version: 1.0 To: Hans de Goede 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 */