PATCH: libv

[Hans de Goede <j.w.r.degoede@hhs.nl>]

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Hi All,

This patch adds support to libv4l for the compressed bayer format emitted by
pac207 based cams.

Signed-off-by: Hans de Goede <j.w.r.degoede@hhs.nl>

Regards,

Hans

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This patch adds support to libv4l for the compressed bayer format emitted by
pac207 based cams.

Signed-off-by: Hans de Goede <j.w.r.degoede@hhs.nl>

diff -r faf96cf9a97c v4l2-apps/lib/libv4l/libv4lconvert/Makefile
--- a/v4l2-apps/lib/libv4l/libv4lconvert/Makefile	Thu Jul 03 14:28:04 2008 +0200
+++ b/v4l2-apps/lib/libv4l/libv4lconvert/Makefile	Thu Jul 03 20:13:42 2008 +0200
@@ -9,7 +9,7 @@
 LDFLAGS       = -shared
 
 CONVERT_LIB   = libv4lconvert.so
-CONVERT_OBJS  = libv4lconvert.o tinyjpeg.o sn9c10x.o \
+CONVERT_OBJS  = libv4lconvert.o tinyjpeg.o sn9c10x.o pac207.o \
 		jidctflt.o spca561-decompress.o rgbyuv.o spca501.o bayer.o
 TARGETS       = $(CONVERT_LIB)
 INCLUDES      = ../include/libv4lconvert.h
diff -r faf96cf9a97c v4l2-apps/lib/libv4l/libv4lconvert/libv4lconvert-priv.h
--- a/v4l2-apps/lib/libv4l/libv4lconvert/libv4lconvert-priv.h	Thu Jul 03 14:28:04 2008 +0200
+++ b/v4l2-apps/lib/libv4l/libv4lconvert/libv4lconvert-priv.h	Thu Jul 03 20:13:42 2008 +0200
@@ -31,6 +31,10 @@
 #define V4L2_PIX_FMT_SPCA561 v4l2_fourcc('S','5','6','1')
 #endif
 
+#ifndef V4L2_PIX_FMT_PAC207
+#define V4L2_PIX_FMT_PAC207 v4l2_fourcc('P','2','0','7')
+#endif
+
 #ifndef V4L2_PIX_FMT_SGBRG8
 #define V4L2_PIX_FMT_SGBRG8 v4l2_fourcc('G','B','R','G')
 #endif
@@ -74,6 +78,9 @@
 void v4lconvert_decode_sn9c10x(const unsigned char *src, unsigned char *dst,
   int width, int height);
 
+void v4lconvert_decode_pac207(const unsigned char *src, unsigned char *dst,
+  int width, int height);
+
 void v4lconvert_bayer_to_bgr24(const unsigned char *bayer,
   unsigned char *rgb, int width, int height, unsigned int pixfmt);
 
diff -r faf96cf9a97c v4l2-apps/lib/libv4l/libv4lconvert/libv4lconvert.c
--- a/v4l2-apps/lib/libv4l/libv4lconvert/libv4lconvert.c	Thu Jul 03 14:28:04 2008 +0200
+++ b/v4l2-apps/lib/libv4l/libv4lconvert/libv4lconvert.c	Thu Jul 03 20:13:42 2008 +0200
@@ -38,6 +38,7 @@
   V4L2_PIX_FMT_SPCA501,
   V4L2_PIX_FMT_SPCA561,
   V4L2_PIX_FMT_SN9C10X,
+  V4L2_PIX_FMT_PAC207,
   -1
 };
 
@@ -318,6 +319,7 @@
     /* compressed bayer formats */
     case V4L2_PIX_FMT_SPCA561:
     case V4L2_PIX_FMT_SN9C10X:
+    case V4L2_PIX_FMT_PAC207:
     {
       unsigned char tmpbuf[dest_fmt->fmt.pix.width*dest_fmt->fmt.pix.height];
       unsigned int bayer_fmt;
@@ -332,6 +334,11 @@
 	  v4lconvert_decode_sn9c10x(src, tmpbuf, dest_fmt->fmt.pix.width,
 				    dest_fmt->fmt.pix.height);
 	  bayer_fmt = V4L2_PIX_FMT_SGBRG8;
+	  break;
+	case V4L2_PIX_FMT_PAC207:
+	  v4lconvert_decode_pac207(src, tmpbuf, dest_fmt->fmt.pix.width,
+				    dest_fmt->fmt.pix.height);
+	  bayer_fmt = V4L2_PIX_FMT_SBGGR8;
 	  break;
       }
 
diff -r faf96cf9a97c v4l2-apps/lib/libv4l/libv4lconvert/pac207.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/v4l2-apps/lib/libv4l/libv4lconvert/pac207.c	Thu Jul 03 20:13:42 2008 +0200
@@ -0,0 +1,421 @@
+/*
+
+# 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 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];
+
+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;
+
+	default:
+            /* FIXME add error reporting */
+            /* Notice this seems to happen with high framerates (low exposure
+               setting due to much light and bad compressible images, so most
+               likely the usb just cannot keep us and we miss parts of some
+               frames (sometimes of many frames in a row) messing things up
+               completely. It might be worth to try changing the compression
+               balance setting to see if that can compensate for this.
+               However currently I cannot reproduce this (no daylight) */
+	    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>
+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>
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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
+*/
+
+/*
+Return-Path: <mxhaard@magic.fr>
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+	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>
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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
+*/
+
+/*
+Return-Path: <bertrik@sikken.nl>
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+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>
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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
+*/

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