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#!/usr/bin/env php
<?php
/*!
*! FILE NAME : exif.php
*! DESCRIPTION: This program collects information about the camera (version, software, sensor)
*! and combines it with the Exif template (default is /etc/Exif_template.xml) to prepare generation
*! of Exif headers.
*! It works in a command line with a single optional parameter - location of the template file and
*! trough the CGI interface. In that case it accepts the following parameter
*! init - program Exif with default /etc/Exif_template.xml
*! init=path - program Exif with alternative file
*! noGPS - don't include GPS-related fields
*! nocompass - don't include compass-related fields
*! template - print currently loaded template data (hex dump)
*! metadir - print currently loaded meta directory that matches variable Exif fields with the template
*! exif=0 - print current Exif page (updated in real time)
*! exif=NNN - print one of the Exif pages in the buffer (debug feature, current buffer pointer is not known here)
*! chn=0..3 - sensor channel
*!
*! Copyright (C) 2007-2016 Elphel, Inc
*! -----------------------------------------------------------------------------**
*!
*! 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 3 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, see <http://www.gnu.org/licenses/>.
*! -----------------------------------------------------------------------------**
*! $Log: exif.php,v $
*! Revision 1.2 2010/08/10 21:14:31 elphel
*! 8.0.8.39 - added EEPROM support for multiplexor and sensor boards, so autocampars.php uses application-specific defaults. Exif Orientation tag support, camera Model reflects application and optional mode (i.e. camera number in Eyesis)
*!
*! Revision 1.1.1.1 2008/11/27 20:04:01 elphel
*!
*!
*! Revision 1.2 2008/08/11 19:11:32 elphel
*! comments
*!
*! Revision 1.1 2008/04/07 09:12:14 elphel
*! New Exif template generation
*!
*! $Log: exif.php,v $
*! Revision 1.2 2010/08/10 21:14:31 elphel
*! 8.0.8.39 - added EEPROM support for multiplexor and sensor boards, so autocampars.php uses application-specific defaults. Exif Orientation tag support, camera Model reflects application and optional mode (i.e. camera number in Eyesis)
*!
*! Revision 1.1.1.1 2008/11/27 20:04:01 elphel
*!
*!
*! Revision 1.2 2008/08/11 19:11:32 elphel
*! comments
*!
*! Revision 1.1 2008/04/07 09:12:14 elphel
*! New Exif template generation
*!
*! Revision 1.1.1.1 2007/10/03 19:05:53 elphel
*! This is a fresh tree based on elphel353-2.10
*!
*! Revision 1.6 2007/10/03 19:05:53 elphel
*! cosmetic
*!
*! Revision 1.5 2007/10/03 18:37:53 elphel
*! Made nice html output to see the result data
*!
*! Revision 1.4 2007/10/03 06:33:31 elphel
*! fixed wrong copyright year
*!
*! Revision 1.3 2007/10/02 19:44:03 elphel
*! minor bug fixes, added "manufacturer note" field for raw frame metadata (36 bytes - /include/asm-cris/c313.h frame_params_t)
*!
*! Revision 1.2 2007/09/25 23:34:02 elphel
*! Fixed time strings to the right length
*!
*! Revision 1.1 2007/09/24 07:27:57 elphel
*! Started php script that prepares Exif header information for serving images by imgsrv
*!
*/
//TODO: Decide with the start sequence, more data is availble after the sensor is initialized.
// Or leave it to imgsrv (it still needs sensor to start first), just put placeholders
// use http://www.exiv2.org/tags.html for reference of the Exif fields if you need to add modify
// the data below
$chn = 0;
$ExifDeviceTemplateFilename="/dev/exif_template";
$ExifDeviceMetadirFilename= "/dev/exif_metadir";
$TiffDeviceTemplateFilename="/dev/tiff_template";
$ExifDeviceExifFilename= "/dev/exif_exif";
$TiffDeviceTiffFilename= "/dev/tiff_tiff";
$ExifDeviceMetaFilename= "/dev/exif_meta";
///$ExifDeviceTemplateFilename="/dev/null";
///$ExifDeviceMetadirFilename= "/dev/null";
///$TiffDeviceTemplateFilename="/dev/null";
///$ExifDeviceExifFilename= "/dev/null";
///$ExifDeviceMetaFilename= "/dev/null";
$DeviceSNFilename = "/sys/devices/soc0/elphel393-init/serial";
$DeviceRevisionFilename = "/sys/devices/soc0/elphel393-init/revision";
$DeviceBrand = "Elphel";
$DeviceModel = "Elphel393";
//! if called from the command line - accepts just one parameter - configuration file,
//! through CGI - accepts more parameters
$ExifXMLName="/etc/Exif_template.xml";
///$ExifXMLName="./Exif_template.xml";
$init=false;
if ($_SERVER['REQUEST_METHOD']=="GET") {
if ($_GET["init"]!==NULL) {
if ($_GET["init"]) $ExifXMLName=$_GET["init"];
$init=true; // in any case - filename specified or not
$noGPS= ($_GET["noGPS"]!==NULL);
$nocompass= ($_GET["nocompass"]!==NULL);
}
if (isset($_GET['chn'])) $chn = $_GET['chn'];
$ExifDeviceExifFilename .= $chn;
$ExifDeviceMetaFilename .= $chn;
$TiffDeviceTiffFilename .= $chn;
} else {
foreach ($_SERVER['argv'] as $param) if (substr($param,0,4)=="init") {
$param=substr($param,5);
if (strlen($param)>0) $ExifXMLName=$param;
$init=true; //
break;
}
if ($init) {
$noGPS= in_array ('noGPS' , $_SERVER['argv']);
$nocompass= in_array ('nocompass', $_SERVER['argv']);
} else {
echo <<<USAGE
Usage: {$_SERVER['argv'][0]} [init[=filename.xml] [noGPS] [nocompass]]
USAGE;
exit (0);
}
}
define("EXIF_BYTE", 1);
define("EXIF_ASCII", 2);
define("EXIF_SHORT", 3);
define("EXIF_LONG", 4);
define("EXIF_RATIONAL", 5);
define("EXIF_SBYTE", 6);
define("EXIF_UNDEFINED", 7);
define("EXIF_SSHORT", 8); //obsolete?
define("EXIF_SLONG", 9);
define("EXIF_SRATIONAL",10);
define("EXIF_LSEEK_ENABLE", 2); // rebuild buffer
/// ===== init/init= CGI parameters or command line mode =======
if ($init) { // configure Exif data
$exif_head= array (
0xff, 0xe1, // APP1 marker at byte 2 of the file
// offset=2 - start of Exif header
0x00, 0x00, // - length of the Exif header (including this length bytes) - we'll fill it later, we do not know it yet
0x45,0x78,0x69,0x66,0x00,0x00); // Exif header
$Exif_length_offset= 2; // put total length here (big endian, 2 bytes)
$exif_data= array (// start of TIFF Header, data offsets will match indexes in this array
0x4d,0x4d, // (MM) Big endian, MSB goes first in multi-byte data
0x00,0x2a, // Tag Mark
0x00,0x00,0x00,0x08); //offset to first IDF (from the beginning of the TIFF header, so 8 is minimum)
$tiff_data= array (// start of TIFF Header, data offsets will match indexes in this array
0x4d,0x4d, // (MM) Big endian, MSB goes first in multi-byte data
0x00,0x2a, // Tag Mark
0x00,0x00,0x00,0x08); //offset to first IDF (from the beginning of the TIFF header, so 8 is minimum)
$xml_both = simplexml_load_file($ExifXMLName); // include tags for either Exif or Tiff
if ($xml_both->GPSInfo) {
/// remove all tags named "Compass..."
if ($nocompass) {
$tounset=array();
foreach ($xml_both->GPSInfo->children() as $entry) if (strpos ($entry->getName() , "Compass" )!==false) $tounset[]=$entry->getName();
foreach ($tounset as $entry) unset ($xml_both->GPSInfo->{$entry});
}
if ($noGPS) {
unset($xml_both->GPSInfo);
unset($xml_both->Image->GPSTag);
}
}
// now copy filtered $xml_both to $xml_exif and $xml_tiff to filter them separately
$xml_exif = simplexml_load_string ( $xml_both->asXML());
foreach ($xml_exif->children() as $group){
$tounset=array();
foreach ($group->children() as $entry) if ($entry->attributes()['mode'] == 'T') $tounset[]=$entry->getName(); // keep if no mode, mode =='E' or mode == 'B'
foreach ($tounset as $entry) unset ($group->{$entry});
}
$xml_tiff = simplexml_load_string ( $xml_both->asXML());
foreach ($xml_tiff->children() as $group){
$tounset=array();
foreach ($group->children() as $entry) if ($entry->attributes()['mode'] == 'E') $tounset[]=$entry->getName(); // keep if no mode, mode =='E' or mode == 'B'
foreach ($tounset as $entry) unset ($group->{$entry});
}
$IFD_offset_exif= count($exif_data); // 8
$SUB_IFD_offset_exif= 12*count($xml_exif->Image->children())+2+4+$IFD_offset_exif; // length of Image (main) IFD including length and offset to next
$GPSInfo_offset_exif= 12*count($xml_exif->Photo->children())+2+4+$SUB_IFD_offset_exif;// length of Photo IFD including length and offset to next
// Include or skip GPS IFD
$data_offset_exif= $GPSInfo_offset_exif+(($xml_exif->GPSInfo)?(12*count($xml_exif->GPSInfo->children())+2+4):0); //$GPSInfo is optional
$IFD_offset_tiff= count($tiff_data); // 8
$SUB_IFD_offset_tiff= 12*count($xml_tiff->Image->children())+2+4+$IFD_offset_tiff; // length of Image (main) IFD including length and offset to next
$GPSInfo_offset_tiff= 12*count($xml_tiff->Photo->children())+2+4+$SUB_IFD_offset_tiff;// length of Photo IFD including length and offset to next
// Include or skip GPS IFD
$data_offset_tiff= $GPSInfo_offset_tiff+(($xml_tiff->GPSInfo)?(12*count($xml_tiff->GPSInfo->children())+2+4):0); //$GPSInfo is optional
if ($_SERVER['REQUEST_METHOD']) {
echo "<pre>";
printf ("IFD_offset_exif=0x%x\n",$IFD_offset_exif);
printf ("SUB_IFD_offset_exif=0x%x\n",$SUB_IFD_offset_exif);
printf ("GPSInfo_offset_exif=0x%x\n",$GPSInfo_offset_exif);
printf ("data_offset_exif=0x%x\n",$data_offset_exif);
printf ("IFD_offset_tiff=0x%x\n",$IFD_offset_tiff);
printf ("SUB_IFD_offset_tiff=0x%x\n",$SUB_IFD_offset_tiff);
printf ("GPSInfo_offset_tiff=0x%x\n",$GPSInfo_offset_tiff);
printf ("data_offset_tiff=0x%x\n",$data_offset_tiff);
}
/*
IFD_offset=0x8
SUB_IFD_offset=0x86
GPSInfo_offset=0xbc
data_offset=0xbc
*/
// printf("\n\n1 - exif_head:\n"); print_r($exif_head);
// printf("\n\n1 - exif_data\n"); print_r($exif_data);
// printf("\n\n1 - tiff_data\n"); print_r($tiff_data);
/// Now modify variable fields substituting values. Has to be separate, as it uses addresses calculated from remaining tags ($SUB_IFD_offset_*,$GPSInfo_offset_*
// for ---- Exif ----
foreach ($xml_exif->Image->children() as $entry) substitute_value($entry, $SUB_IFD_offset_exif, $GPSInfo_offset_exif);
foreach ($xml_exif->Photo->children() as $entry) substitute_value($entry, $SUB_IFD_offset_exif, $GPSInfo_offset_exif);
if ($xml_exif->GPSInfo) {
foreach ($xml_exif->GPSInfo->children() as $entry) substitute_value($entry, $SUB_IFD_offset_exif, $GPSInfo_offset_exif);
}
$ifd_pointer_exif=$IFD_offset_exif;
$data_pointer_exif=$data_offset_exif;
// printf("ifd_pointer_exif= % d, data_pointer_exif = %d, count(xml_exif->Image->children())=%d\n",$ifd_pointer_exif, $data_pointer_exif, count($xml_exif->Image->children()));
start_ifd(count($xml_exif->Image->children()), $exif_data, $ifd_pointer_exif);
// printf("ifd_pointer_exif= % d, data_pointer_exif = %d\n",$ifd_pointer_exif, $data_pointer_exif);
// printf("\n\n0 - exif_data\n"); print_r($exif_data);
foreach ($xml_exif->Image->children() as $entry) process_ifd_entry($entry, 0, $exif_data, $ifd_pointer_exif, $data_pointer_exif, $SUB_IFD_offset_exif, $GPSInfo_offset_exif);
finish_ifd($exif_data, $ifd_pointer_exif);
$ifd_pointer_exif=$SUB_IFD_offset_exif;
start_ifd(count($xml_exif->Photo->children()), $exif_data, $ifd_pointer_exif);
foreach ($xml_exif->Photo->children() as $entry) process_ifd_entry($entry, 1, $exif_data, $ifd_pointer_exif, $data_pointer_exif, $SUB_IFD_offset_exif, $GPSInfo_offset_exif);
finish_ifd($exif_data, $ifd_pointer_exif);
if ($xml_exif->GPSInfo) {
$ifd_pointer_exif=$GPSInfo_offset_exif;
start_ifd(count($xml_exif->GPSInfo->children()), $exif_data, $ifd_pointer_exif);
foreach ($xml_exif->GPSInfo->children() as $entry) process_ifd_entry($entry, 2, $exif_data, $ifd_pointer_exif, $data_pointer_exif, $SUB_IFD_offset_exif, $GPSInfo_offset_exif);
finish_ifd($exif_data, $ifd_pointer_exif);
}
$exif_len=count($exif_head)+count($exif_data)-$Exif_length_offset;
// printf("\nexif_len = %d, Exif_length_offset = %d\n",$exif_len, $Exif_length_offset);
$exif_head[$Exif_length_offset]= ($exif_len >> 8) & 0xff;
$exif_head[$Exif_length_offset+1]= $exif_len & 0xff;
// printf("\n\n2 - exif_head:\n"); print_r($exif_head);
// printf("\n\n2 - exif_data\n"); print_r($exif_data);
// ---- for Tiff ---- Need to catch $STRIPOFFSETS
foreach ($xml_tiff->Image->children() as $entry) substitute_value($entry, $SUB_IFD_offset_tiff, $GPSInfo_offset_tiff);
foreach ($xml_tiff->Photo->children() as $entry) substitute_value($entry, $SUB_IFD_offset_tiff, $GPSInfo_offset_tiff);
if ($xml_tiff->GPSInfo) {
foreach ($xml_tiff->GPSInfo->children() as $entry) substitute_value($entry, $SUB_IFD_offset_tiff, $GPSInfo_offset_tiff);
}
$ifd_pointer_tiff=$IFD_offset_tiff;
$data_pointer_tiff=$data_offset_tiff;
start_ifd(count($xml_tiff->Image->children()), $tiff_data, $ifd_pointer_tiff);
foreach ($xml_tiff->Image->children() as $entry) {
if ($entry->getName() == "StripOffsets") {
$StripOffsets_ifd_pointer = $ifd_pointer_tiff; // put STRIPOFFSET long here when known
$StripOffsets_data_pointer = $data_pointer_tiff; // put STRIPOFFSET long here when known
$StripOffsets_entry = $entry;
}
process_ifd_entry($entry, 0, $tiff_data, $ifd_pointer_tiff, $data_pointer_tiff, $SUB_IFD_offset_tiff, $GPSInfo_offset_tiff);
}
finish_ifd($tiff_data, $ifd_pointer_tiff);
$ifd_pointer_tiff=$SUB_IFD_offset_tiff;
start_ifd(count($xml_tiff->Photo->children()), $tiff_data, $ifd_pointer_tiff);
foreach ($xml_tiff->Photo->children() as $entry) process_ifd_entry($entry, 1, $tiff_data, $ifd_pointer_tiff, $data_pointer_tiff, $SUB_IFD_offset_tiff, $GPSInfo_offset_tiff);
finish_ifd($tiff_data, $ifd_pointer_tiff);
if ($xml_tiff->GPSInfo) {
$ifd_pointer_tiff=$GPSInfo_offset_tiff;
start_ifd(count($xml_tiff->GPSInfo->children()), $tiff_data, $ifd_pointer_tiff);
foreach ($xml_tiff->GPSInfo->children() as $entry) process_ifd_entry($entry, 2, $tiff_data, $ifd_pointer_tiff, $data_pointer_tiff, $SUB_IFD_offset_tiff, $GPSInfo_offset_tiff);
finish_ifd($tiff_data, $ifd_pointer_tiff);
}
// printf("\n\nbefore STRIPOFFSETS - tiff_data\n"); print_r($tiff_data);
// printf("StripOffsets_ifd_pointer= 0x%x (%d)\n", $StripOffsets_ifd_pointer, $StripOffsets_ifd_pointer);
// printf("StripOffsets_data_pointer=0x%x (%d)\n", $StripOffsets_data_pointer, $StripOffsets_data_pointer);
// printf("count(tiff_data)=0x%x (%d)\n", count($tiff_data), count($tiff_data));
if ($StripOffsets_ifd_pointer) {
// echo "StripOffsets_entry:";
// echo $StripOffsets_entry->getName();
$StripOffsets_entry->addChild('value', count($tiff_data));
// re-process
// process_ifd_entry($StripOffsets_entry, 0, $tiff_data, $StripOffsets_ifd_pointer, $StripOffsets_data_pointer, $SUB_IFD_offset_tiff, $GPSInfo_offset_tiff, 1);
process_ifd_entry($StripOffsets_entry, 0, $tiff_data, $StripOffsets_ifd_pointer, $StripOffsets_data_pointer, $SUB_IFD_offset_tiff, $GPSInfo_offset_tiff);
}
$Exif_str="";
for ($i=0; $i<count($exif_head);$i++) $Exif_str.= chr ($exif_head[$i]);
for ($i=0; $i<count($exif_data);$i++) $Exif_str.= chr ($exif_data[$i]);
// printf("\ - Exif_str\n"); hexdump($Exif_str);
$Tiff_str="";
for ($i=0; $i<count($tiff_data);$i++) $Tiff_str.= chr ($tiff_data[$i]);
// printf("\ - Tiff_str\n"); hexdump($Tiff_str);
$Exif_file = fopen($ExifDeviceTemplateFilename, 'w');
fwrite ($Exif_file,$Exif_str); /// will disable and invalidate Exif data
fclose($Exif_file);
$Tiff_file = fopen($TiffDeviceTemplateFilename, 'w');
fwrite ($Tiff_file,$Tiff_str); /// will disable and invalidate Exif data
fclose($Tiff_file);
// printf("\ - Tiff_str\n"); hexdump($Tiff_str);
$dir_entries_exif=array();
$exif_head_length = count($exif_head);
foreach ($xml_exif->Image->children() as $entry) addDirEntry($entry, $dir_entries_exif, $exif_head_length);
foreach ($xml_exif->Photo->children() as $entry) addDirEntry($entry, $dir_entries_exif, $exif_head_length);
if ($xml_exif->GPSInfo) {
foreach ($xml_exif->GPSInfo->children() as $entry) addDirEntry($entry, $dir_entries_exif, $exif_head_length);
}
// printf("\ndir_entries_exif:\n"); print_r($dir_entries_exif);
ksort ($dir_entries_exif);
// printf("\ndir_entries_exif sorted:\n"); print_r($dir_entries_exif);
$dir_entries_tiff=array();
foreach ($xml_tiff->Image->children() as $entry) addDirEntry($entry, $dir_entries_tiff, 0);
foreach ($xml_tiff->Photo->children() as $entry) addDirEntry($entry, $dir_entries_tiff, 0);
if ($xml_tiff->GPSInfo) {
foreach ($xml_tiff->GPSInfo->children() as $entry) addDirEntry($entry, $dir_entries_tiff, 0);
}
// printf("\ndir_entries_tiff:\n"); print_r($dir_entries_tiff);
ksort ($dir_entries_tiff);
// printf("\ndir_entries_tiff sorted:\n"); print_r($dir_entries_tiff);
// combine directories
$dir_entries=array();
foreach ($dir_entries_exif as $key => $value){
$dir_entries[$key] = array("ltag"=>$value['ltag'],"dst_exif"=>$value['dst'],"dst_tiff"=>0,"len"=>$value['len']);
}
foreach ($dir_entries_tiff as $key => $value){
if (array_key_exists($key, $dir_entries)){
$dir_entries[$key]["dst_tiff"] = $value['dst'];
} else {
$dir_entries[$key] = array("ltag"=>$value['ltag'],"dst_exif"=>0,"dst_tiff"=>$value['dst'],"len"=>$value['len']);
}
}
ksort ($dir_entries);
// get rid of keys:
$dir_entries_val=array();
foreach ($dir_entries as $value)$dir_entries_val[] = $value;
$dir_entries = $dir_entries_val;
$frame_meta_size=0;
for ($i=0;$i<count($dir_entries);$i++) {
$dir_entries[$i]["src"]=$frame_meta_size;
$frame_meta_size+=$dir_entries[$i]["len"];
}
// printf("\ndir_entries sorted:\n"); print_r($dir_entries);
$Exif_str="";
foreach ($dir_entries as $entry) $Exif_str.=pack("V*",$entry["ltag"],$entry["len"],$entry["src"],($entry["dst_exif"] +($entry["dst_tiff"] << 16)));
// printf("\ - Exif_str (directory)\n"); hexdump($Exif_str);
$Exif_meta_file = fopen($ExifDeviceMetadirFilename, 'w');
fwrite ($Exif_meta_file,$Exif_str); /// will disable and invalidate Exif data
fclose($Exif_meta_file);
///Rebuild buffer and enable Exif generation/output:
$Exif_file = fopen($ExifDeviceTemplateFilename, 'w');
fseek ($Exif_file, EXIF_LSEEK_ENABLE, SEEK_END) ;
fclose($Exif_file);
if ($_SERVER['REQUEST_METHOD']) {
echo "</pre>";
}
if ($_SERVER['REQUEST_METHOD']) {
echo "<hr/>\n";
test_print_header($exif_head, $exif_data);
echo "<hr/>\n";
$tiff_head=array(); // empty
test_print_header($tiff_head, $tiff_data);
echo "<hr/>\n";
test_print_directory($dir_entries,$frame_meta_size);
}
} //if ($init) // configure Exif data
/// ===== processing optional parameters =======
/// ===== read template =======
if ($_GET["description"]!==NULL) {
/// Read metadir to find the length of the description field
$Exif_file = fopen($ExifDeviceMetadirFilename, 'r');
fseek ($Exif_file, 0, SEEK_END) ;
fseek ($Exif_file, 0, SEEK_SET) ;
$metadir=fread ($Exif_file, 4096);
fclose($Exif_file);
$dir_entries=array();
for ($i=0; $i<strlen($metadir);$i+=16) {
$dir_entries[]=unpack("V*",substr($metadir,$i,16));
}
foreach ($dir_entries as $entry)
if ($entry[1]==0x010e) {
$descr=$_GET["description"];
$Exif_file = fopen($ExifDeviceMetaFilename, 'w+');
fseek ($Exif_file, $entry[3], SEEK_SET) ;
$descr_was=fread ($Exif_file, $entry[2]);
$zero=strpos($descr_was,chr(0));
if ($zero!==false) $descr_was=substr($descr_was,0, $zero);
if ($descr) {
$descr= str_pad($descr, $entry[2], chr(0));
fseek ($Exif_file, $entry[3], SEEK_SET) ;
fwrite($Exif_file, $descr,$entry[2]);
}
fclose($Exif_file);
var_dump($descr_was); echo "<br/>\n";
break;
}
}
/// ===== read template =======
if ($_GET["template"]!==NULL) {
$Exif_file = fopen($ExifDeviceTemplateFilename, 'r');
fseek ($Exif_file, 0, SEEK_END) ;
echo "<hr/>\n";
echo "ftell()=".ftell($Exif_file).", ";
fseek ($Exif_file, 0, SEEK_SET) ;
$template=fread ($Exif_file, 4096);
fclose($Exif_file);
echo "read ".strlen($template)." bytes<br/>\n";
hexdump($template);
}
if ($_GET["template_tiff"]!==NULL) {
$Exif_file = fopen($TiffDeviceTemplateFilename, 'r');
fseek ($Exif_file, 0, SEEK_END) ;
echo "<hr/>\n";
echo "ftell()=".ftell($Exif_file).", ";
fseek ($Exif_file, 0, SEEK_SET) ;
$template=fread ($Exif_file, 4096);
fclose($Exif_file);
echo "read ".strlen($template)." bytes<br/>\n";
hexdump($template);
}
/// ===== read meta directory =======
if ($_GET["metadir"]!==NULL) {
$Exif_file = fopen($ExifDeviceMetadirFilename, 'r');
fseek ($Exif_file, 0, SEEK_END) ;
echo "<hr/>\n";
echo "ftell()=".ftell($Exif_file).", ";
fseek ($Exif_file, 0, SEEK_SET) ;
$metadir=fread ($Exif_file, 4096);
fclose($Exif_file);
echo "read ".strlen($metadir)." bytes<br/>\n";
$dir_entries=array();
for ($i=0; $i<strlen($metadir);$i+=16) {
$dir_entries[]=unpack("V*",substr($metadir,$i,16));
}
print_directory($dir_entries);
}
/// ===== read one of the Exif pages (0 - current, 1..512 - buffer) =======
if ($_GET["exif"]!==NULL) {
$frame=$_GET["exif"]+0;
echo "<hr/>\n";
printf ("Reading frame %d, ",$frame);
$Exif_file = fopen($ExifDeviceExifFilename, 'r');
fseek ($Exif_file, 1, SEEK_END) ;
$exif_size=ftell($Exif_file);
if ($frame) fseek ($Exif_file, $frame, SEEK_END) ;
else fseek ($Exif_file, 0, SEEK_SET) ;
echo "ftell()=".ftell($Exif_file).", ";
$exif_data=fread ($Exif_file, $exif_size);
fclose($Exif_file);
echo "read ".strlen($exif_data)." bytes<br/>\n";
hexdump($exif_data);
}
if ($_GET["tiff"]!==NULL) {
$frame=$_GET["tiff"]+0;
echo "<hr/>\n";
printf ("Reading frame %d from %s, ",$frame,$ExifDeviceTiffFilename);
$Tiff_file = fopen($TiffDeviceTiffFilename, 'r');
fseek ($Tiff_file, 1, SEEK_END) ;
$tiff_size=ftell($Tiff_file);
if ($frame) fseek ($Tiff_file, $frame, SEEK_END) ;
else fseek ($Tiff_file, 0, SEEK_SET) ;
echo "ftell()=".ftell($Tiff_file).", ";
$tiff_data=fread ($Tiff_file, $tiff_size);
fclose($Tiff_file);
echo "read ".strlen($tiff_data)." bytes<br/>\n";
hexdump($tiff_data);
}
exit(0);
/// ======================================= Functions ======================================
function hexdump(&$data) {
// global $exif_head, $exif_data;
$l=strlen($data);
printf ("<h2>Data size=%d bytes</h2>\n",$l);
printf ("<table border=\"0\">\n");
for ($i=0; $i<$l;$i=$i+16) {
printf("<tr><td>%03x</td><td>|</td>\n",$i);
for ($j=$i; $j<$i+16;$j++) {
printf("<td>");
if ($j<$l) {
$d=ord($data[$j]);
printf(" %02x",$d);
} else printf (" ");
printf("</td>");
}
printf("<td>|</td>");
for ($j=$i; $j< ($i+16);$j++) {
printf("<td>");
if ($j<$l) {
$d=ord($data[$j]);
if ($d<32 or $d>126) printf(".");
else printf ("%c",$d);
} else printf (" ");
printf("</td>");
}
printf("</tr>\n");
}
printf ("</table>");
}
function print_directory($dir_entries) {
$meta_size=0;
foreach ($dir_entries as $entry) if (($entry[3]+$entry[2])>$meta_size) $meta_size=$entry[3]+$entry[2];
printf ("<h2>Frame meta data size=%d bytes</h2>\n",$meta_size);
printf ("<table border=\"1\">\n");
printf ("<tr><th>ltag</th><th>meta offset</th><th>Exif offset</th><th>Tiff offset</th><th>length</th></tr>\n");
foreach ($dir_entries as $entry) {
$exif_offset = $entry[4] & 0xfff;
$tiff_offset = $entry[4] >> 16;
printf ("<tr><td>0x%x</td><td>0x%x</td><td>0x%x</td><td>0x%x</td><td>0x%x</td></tr>\n",$entry[1],$entry[3],$exif_offset,$tiff_offset,$entry[2]);
}
printf ("</table>");
}
function test_print_header(&$exif_head, &$exif_data) {
// global $exif_head, $exif_data;
$lh = 0;
if ($exif_head) $lh=count($exif_head);
$ld=count($exif_data);
printf ("<h2>Exif/Tiff size=%d bytes (head=%d, data=%d)</h2>\n",$lh+$ld,$lh,$ld);
printf ("<table border=\"0\">\n");
for ($i=0; $i<$lh+$ld;$i=$i+16) {
printf("<tr><td>%03x</td><td>|</td>\n",$i);
for ($j=$i; $j<$i+16;$j++) {
printf("<td>");
if ($j<($lh+$ld)) {
$d=($j<$lh)?$exif_head[$j]:$exif_data[$j-$lh];
printf(" %02x",$d);
} else printf (" ");
printf("</td>");
}
printf("<td>|</td>");
for ($j=$i; $j< ($i+16);$j++) {
printf("<td>");
if ($j<($lh+$ld)) {
$d=($j<$lh)?$exif_head[$j]:$exif_data[$j-$lh];
if ($d<32 or $d>126) printf(".");
else printf ("%c",$d);
} else printf (" ");
printf("</td>");
}
printf("</tr>\n");
}
printf ("</table>");
}
function test_print_directory(&$dir_entries, &$frame_meta_size) {
// global $dir_entries,$frame_meta_size;
printf ("<h2>Frame meta data size=%d bytes</h2>\n", $frame_meta_size);
printf ("<table border=\"1\">\n");
printf ("<tr><th>ltag</th><th>meta offset</th><th>Exif offset</th><th>Tiff offset</th><th>length</th></tr>\n");
foreach ($dir_entries as $entry)
printf ("<tr><td>0x%x</td><td>0x%x</td><td>0x%x</td><td>0x%x</td><td>0x%x</td></tr>\n",$entry["ltag"],$entry["src"],$entry["dst_exif"],$entry["dst_tiff"],$entry["len"]);
printf ("</table>");
}
function start_ifd($count, &$exif_data, &$ifd_pointer) {
// global $exif_data, $ifd_pointer;
// printf("start_ifd: ifd_pointer=0x%04x \n", $ifd_pointer);
$exif_data[$ifd_pointer++]= ($count >> 8) & 0xff;
$exif_data[$ifd_pointer++]= $count & 0xff; // may apply & 0xff in the end to all elements
// printf("++++start_ifd(): ifd_pointer= %d, exif_data=\n",$ifd_pointer); print_r($exif_data);
}
function finish_ifd(&$exif_data, &$ifd_pointer) { // we do not have additional IFDs
// global $exif_data, $ifd_pointer;
// printf("finish_ifd: ifd_pointer=0x%04x \n", $ifd_pointer);
$exif_data[$ifd_pointer++]=0;
$exif_data[$ifd_pointer++]=0;
$exif_data[$ifd_pointer++]=0;
$exif_data[$ifd_pointer++]=0;
}
//pass2 - building map from frame meta to Exif template
function addDirEntry0($ifd_entry, &$dir_sequence, &$dir_entries, $lh) {
// global $dir_sequence,$dir_entries,$exif_head;
// $lh=count($exif_head);
$attrs = $ifd_entry->attributes();
// var_dump($attrs);
// if (array_key_exists ( "seq" , $attrs )) {
if ($attrs["seq"]) {
// echo $attrs["seq"].;
$dir_sequence[]=((string) $attrs["seq"])+0;
$len= (integer) $ifd_entry->value_length;
$offs=$lh+(integer) $ifd_entry->value_offest;
// if (array_key_exists ( "dlen" , $attrs ))
if ($attrs["dlen"]) $len=min($len,((string) $attrs["dlen"])+0);
$dir_entries[]=array("ltag"=>((integer)$ifd_entry->ltag),"dst"=>$offs,"len"=>$len);
}
}
function addDirEntry($ifd_entry, &$dir_entries, $lh) {
// global $dir_sequence,$dir_entries,$exif_head;
// $lh=count($exif_head);
$attrs = $ifd_entry->attributes();
// var_dump($attrs);
// if (array_key_exists ( "seq" , $attrs )) {
if ($attrs["seq"]) {
// echo $attrs["seq"].;
$key=((string) $attrs["seq"])+0;
$len= (integer) $ifd_entry->value_length;
$offs=$lh+(integer) $ifd_entry->value_offest;
// if (array_key_exists ( "dlen" , $attrs ))
if ($attrs["dlen"]) $len=min($len,((string) $attrs["dlen"])+0);
$dir_entries[$key]=array("ltag"=>((integer)$ifd_entry->ltag),"dst"=>$offs,"len"=>$len);
}
}
function substitute_value($ifd_entry, $SUB_IFD_offset, $GPSInfo_offset) {
// global $SUB_IFD_offset,$GPSInfo_offset;
global $DeviceSNFilename, $DeviceRevisionFilename, $DeviceBrand, $DeviceModel; // keep these globals
$attrs = $ifd_entry->attributes();
switch ($attrs["function"]) {
case "BRAND":
$ifd_entry->addChild('value', $DeviceBrand);
break;
case "MODEL":
$camera_state_path = "/var/volatile/state/camera";
if (file_exists ($camera_state_path)) {
$pars= parse_ini_file($camera_state_path);
$model = $pars['application']."_".$pars['mode'];
} else {
$model = $DeviceModel;
}
$ifd_entry->addChild ('value',$model);
break;
case "SOFTWARE":
/* TODO:
if (file_exists("/usr/html/docs/")) {
$ifd_entry->addChild ('value',exec("ls /usr/html/docs/")); // filter
}
*/
$ifd_entry->addChild ('value',"https://git.elphel.com/Elphel/elphel393");
break;
case "SERIAL":
$s = "";
if (file_exists($DeviceSNFilename)) {
$s = exec('cat '.$DeviceSNFilename);
}
$ifd_entry->addChild ('value',substr($s,0,2).":".substr($s,2,2).":".substr($s,4,2).":".substr($s,6,2).":".substr($s,8,2).":".substr($s,10,2));
break;
case "EXIFTAG":
$ifd_entry->addChild ('value',$SUB_IFD_offset);
break;
case "GPSTAG":
$ifd_entry->addChild ('value',$GPSInfo_offset);
break;
// case "STRIPOFFSETS": // temporary - maybe remove this function
// $ifd_entry->addChild ('value',$GPSInfo_offset);
// break;
//STRIPOFFSETS
}
}
function process_ifd_entry($ifd_entry, $group, &$exif_data, &$ifd_pointer, &$data_pointer, $SUB_IFD_offset, $GPSInfo_offset, $debug=0) {
// global $exif_data, $ifd_pointer, $data_pointer,$SUB_IFD_offset,$GPSInfo_offset;
$attrs = $ifd_entry->attributes();
$ifd_tag= ((string) $attrs["tag"])+0;
$ifd_format=constant("EXIF_".$attrs["format"]);
$ifd_count= $attrs["count"];
if ($debug){
echo "\nifd_tag "; echo $ifd_tag; echo "\n";
echo "ifd_format "; echo $ifd_format; echo "\n";
echo "ifd_count "; echo $ifd_count; echo "\n";
echo "\nifd_tag=$ifd_tag, entry=";print_r($ifd_entry);
echo "\nifd_count=$ifd_count";
echo "\nifd_bytes:";var_dump($ifd_bytes);
}
if (!$ifd_count) {
if($ifd_format==EXIF_ASCII) $ifd_count=strlen($ifd_entry->value)+1;
else $ifd_count=1 ; /// may change?
}
//echo "\nifd_count=$ifd_count";
$exif_data[$ifd_pointer++]= ($ifd_tag >> 8) & 0xff;
$exif_data[$ifd_pointer++]= $ifd_tag & 0xff;
$exif_data[$ifd_pointer++]= ($ifd_format >> 8 ) & 0xff;
$exif_data[$ifd_pointer++]= $ifd_format & 0xff;
$exif_data[$ifd_pointer++]= ($ifd_count >> 24) & 0xff;
$exif_data[$ifd_pointer++]= ($ifd_count >> 16) & 0xff;
$exif_data[$ifd_pointer++]= ($ifd_count >> 8) & 0xff;
$exif_data[$ifd_pointer++]= $ifd_count & 0xff;
$ifd_bytes=0;
switch ($ifd_format) {
case EXIF_SHORT:
case EXIF_SSHORT: $ifd_bytes=2; break;
case EXIF_LONG:
case EXIF_SLONG: $ifd_bytes=4; break;
case EXIF_RATIONAL:
case EXIF_SRATIONAL: $ifd_bytes=8; break;
default: $ifd_bytes=1; //1,2,6,7
}
$ifd_bytes=$ifd_bytes*$ifd_count;
// now prepare ifd_data - array of bytes
switch ($ifd_format) {
case EXIF_BYTE:
case EXIF_SBYTE:
$ifd_data= array ();
foreach ($ifd_entry->value as $a) $ifd_data[]= $a & 0xff;
break;
case EXIF_ASCII:
$ifd_data= str_split($ifd_entry->value);
foreach($ifd_data as &$d) $d=ord($d);
break;
case EXIF_SHORT:
case EXIF_SSHORT:
$ifd_data= array ();
foreach ($ifd_entry->value as $a) $ifd_data=array_merge($ifd_data,array(($a >> 8) & 0xff, $a & 0xff));
break;
case EXIF_LONG:
case EXIF_SLONG:
$ifd_data= array ();
foreach ($ifd_entry->value as $a) $ifd_data=array_merge($ifd_data,array(($a >> 24) & 0xff,($a >> 16) & 0xff,($a >> 8) & 0xff, $a & 0xff));
break;
case EXIF_RATIONAL:
case EXIF_SRATIONAL:
$nom= array ();
foreach ($ifd_entry->nominator as $a) $nom[]= array(($a >> 24) & 0xff,($a >> 16) & 0xff,($a >> 8) & 0xff, $a & 0xff);
$denom= array ();
foreach ($ifd_entry->denominator as $a) $denom[]=array(($a >> 24) & 0xff,($a >> 16) & 0xff,($a >> 8) & 0xff, $a & 0xff);
$ifd_data= array ();
/*
var_dump($nom);
echo "\n";
var_dump($denom);
echo "\n";
//exit(0);
*/
for ($i=0;$i<count($nom);$i++) {
// echo "i=$i\n";
// echo "\nnom=";var_dump($nom[$i]);
// echo "\ndenom=";var_dump($denom[$i]);
$ifd_data=array_merge($ifd_data,$nom[$i],$denom[$i]);
}
break; // rational, (un)signed
case EXIF_UNDEFINED: // undefined
$ifd_data= array_fill(0,$ifd_bytes,0); // will just fill with "0"-s
break;
}
// echo "\nifd_tag=$ifd_tag, entry=";print_r($i=$ifd_entry->value);
// echo "\nifd_data:";var_dump($ifd_data);
// echo "\nifd_bytes:";var_dump($ifd_bytes);
$ifd_data=array_pad($ifd_data,$ifd_bytes,0);
$ifd_entry->addChild ('value_length',count($ifd_data));
// if (array_key_exists ( "ltag" , $attrs )) $ltag= ((string) $attrs["ltag"])+0;
if ($attr["ltag"]) $ltag= ((string) $attrs["ltag"])+0;
else $ltag= $ifd_tag+($group<<16) ;
$ifd_entry->addChild ("ltag",$ltag );
if (count($ifd_data) <=4) {
$ifd_entry->addChild ('value_offest',$ifd_pointer);
// $ifd_data= array_pad($ifd_data,-4,0); // add leading zeroes if <4 bytes
$ifd_data= array_pad($ifd_data, 4,0); // add trailing zeroes if <4 bytes (for shorts)
for ($i=0;$i<4;$i++) $exif_data[$ifd_pointer++]=$ifd_data[$i];
} else { //pointer, not data
$ifd_entry->addChild ('value_offest',$data_pointer);
$exif_data[$ifd_pointer++]= ($data_pointer >> 24) & 0xff;
$exif_data[$ifd_pointer++]= ($data_pointer >> 16) & 0xff;
$exif_data[$ifd_pointer++]= ($data_pointer >> 8) & 0xff;
$exif_data[$ifd_pointer++]= $data_pointer & 0xff;
for ($i=0;$i<count($ifd_data);$i++) {
$exif_data[$data_pointer++]=$ifd_data[$i];
}
}
}
?>