1 | <?php |
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2 | /** |
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3 | * --:: JPEG MetaDatas ::------------------------------------------------------- |
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4 | * |
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5 | * Version : 1.0.0 |
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6 | * Date : 2009/12/26 |
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7 | * |
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8 | * Author : Grum |
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9 | * email : grum at piwigo.org |
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10 | * website : http://photos.grum.fr |
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11 | * |
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12 | * << May the Little SpaceFrog be with you ! >> |
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13 | * |
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14 | * +-----------------------------------------------------------------------+ |
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15 | * | JpegMetaData - a PHP based Jpeg Metadata manager | |
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16 | * +-----------------------------------------------------------------------+ |
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17 | * | Copyright(C) 2010 Grum - http://www.grum.fr | |
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18 | * +-----------------------------------------------------------------------+ |
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19 | * | This program is free software; you can redistribute it and/or modify | |
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20 | * | it under the terms of the GNU General Public License as published by | |
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21 | * | the Free Software Foundation | |
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22 | * | | |
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23 | * | This program is distributed in the hope that it will be useful, but | |
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24 | * | WITHOUT ANY WARRANTY; without even the implied warranty of | |
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25 | * | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
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26 | * | General Public License for more details. | |
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27 | * | | |
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28 | * | You should have received a copy of the GNU General Public License | |
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29 | * | along with this program; if not, write to the Free Software | |
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30 | * | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, | |
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31 | * | USA. | |
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32 | * +-----------------------------------------------------------------------+ |
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33 | * |
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34 | * |
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35 | * +-:: HISTORY ::--------+----------------------------------------------------- |
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36 | * | | | |
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37 | * | Release | Date | |
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38 | * +---------+------------+----------------------------------------------------- |
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39 | * | 0.1.0a | 2009-12-26 | |
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40 | * | | | |
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41 | * | | | |
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42 | * | | | |
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43 | * | | | |
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44 | * | | | |
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45 | * | | | |
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46 | * | | | |
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47 | * | | | |
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48 | * | | | |
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49 | * | | | |
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50 | * +---------+------------+----------------------------------------------------- |
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51 | * |
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52 | * |
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53 | * ----------------------------------------------------------------------------- |
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54 | * |
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55 | * References about definition & interpretation of metadata tags : |
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56 | * - EXIF 2.20 Specification => http://www.exif.org/Exif2-2.PDF |
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57 | * - TIFF 6.0 Specification => http://partners.adobe.com/public/developer/en/tiff/TIFF6.pdf |
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58 | * - Exiftool by Phil Harvey => http://www.sno.phy.queensu.ca/~phil/exiftool/ |
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59 | * http://owl.phy.queensu.ca/~phil/exiftool/TagNames |
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60 | * - Exiv2 by Andreas Huggel => http://www.exiv2.org/ |
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61 | * - MetaData working group => http://www.metadataworkinggroup.org/specs/ |
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62 | * - Adobe XMP Developer Center => http://www.adobe.com/devnet/xmp/ |
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63 | * - Gezuz => http://gezus.one.free.fr/?Plugin-EXIF-pour-Spip-1-9-2 |
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64 | * - JPEG format => http://crousseau.free.fr/imgfmt_jpeg.htm |
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65 | * - International Press Telecomunication Council specifications |
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66 | * => http://www.iptc.org/ |
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67 | * - IPTC headers structure => http://www.codeproject.com/KB/graphics/iptc.aspx?msg=1014929 |
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68 | * - CPAN => http://search.cpan.org/dist/Image-MetaData-JPEG/lib/Image/MetaData/JPEG/Structures.pod |
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69 | * => http://search.cpan.org/~bettelli/Image-MetaData-JPEG/lib/Image/MetaData/JPEG/MakerNotes.pod |
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70 | * |
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71 | * ----------------------------------------------------------------------------- |
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72 | * To support internationalization the JpegMetaData package uses ".po" and ".mo" |
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73 | * files, and use "php-gettext" |
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74 | * ==> See files in External/php-gettext for more information about this project |
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75 | * ----------------------------------------------------------------------------- |
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76 | * |
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77 | * The JpegMetaData is the main class for reading metadata of a Jpeg file |
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78 | * |
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79 | * It provides two essentialy high level functions to read different kind of |
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80 | * metadata (EXIF, IPTC, XMP) : |
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81 | * - (static) getTagList |
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82 | * - load |
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83 | * - getTags |
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84 | * |
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85 | * ----------------------------------------------------------------------------- |
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86 | * |
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87 | * .. Notes .. |
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88 | * |
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89 | * About tags and translation in local lang |
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90 | * With the 'getTags()' method, the JpegMetaData returns an array of Tag objects |
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91 | * found in the jpeg file. |
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92 | * |
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93 | * A Tag object have 2 properties that can be translated into a local language : |
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94 | * - the name, getted with 'getName()' |
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95 | * - the valueLabel, getted with 'getLabel()' |
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96 | * |
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97 | * Theses properties ARE NOT translated automatically. |
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98 | * |
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99 | * You can translate it with the Locale class, by using the static method 'get' |
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100 | * |
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101 | * Example : |
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102 | * Locale::get($myTag->getName()) will return the translated name of the Tag |
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103 | * Locale::get($myTag->getLabel()) will return the translated value of the Tag |
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104 | * |
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105 | * ===========> See Tag.class.php to know more about the Tag class <============ |
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106 | * ========> See Locale.class.php to know more about the Locale class <========= |
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107 | * |
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108 | * |
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109 | * ----------------------------------------------------------------------------- |
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110 | */ |
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111 | |
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112 | define("JPEG_METADATA_DIR", dirname(__FILE__)."/"); |
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113 | |
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114 | require_once(JPEG_METADATA_DIR."Readers/JpegReader.class.php"); |
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115 | |
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116 | class JpegMetaData |
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117 | { |
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118 | const TAGFILTER_KNOWN = 0x01; |
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119 | const TAGFILTER_IMPLEMENTED = 0x02; |
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120 | const TAGFILTER_ALL = 0x03; |
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121 | |
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122 | const KEY_EXIF_TIFF = "exif.tiff"; |
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123 | const KEY_EXIF_EXIF = "exif.exif"; |
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124 | const KEY_EXIF_GPS = "exif.gps"; |
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125 | const KEY_EXIF = "exif"; |
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126 | const KEY_IPTC = "iptc"; |
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127 | const KEY_XMP = "xmp"; |
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128 | |
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129 | private $jpeg = null; |
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130 | private $tags = Array(); |
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131 | private $options = Array(); |
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132 | |
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133 | /** |
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134 | * this static function returns an array of tags definitions |
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135 | * |
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136 | * the only parameter is an array to determine filter options |
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137 | * |
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138 | * ---------------------+--------------------------------------------------- |
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139 | * key | descriptions/values |
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140 | * ---------------------+--------------------------------------------------- |
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141 | * filter | Integer |
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142 | * | This options is used to filter implemented tag |
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143 | * | JpegMetaData::TAGFILTER_ALL |
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144 | * | => returns all the tags |
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145 | * | JpegMetaData::TAGFILTER_IMPLEMENTED |
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146 | * | => returns only the implemented tags |
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147 | * | |
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148 | * optimizeIptcDateTime | Boolean |
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149 | * | IPTC Date/Time are separated into 2 tags |
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150 | * | if this option is set to true, only dates tags are |
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151 | * | returned (assuming this option is used when an |
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152 | * | image file is loaded) |
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153 | * | |
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154 | * exif | Boolean |
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155 | * iptc | If set to true, the function returns all the tags |
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156 | * | known for the specified type tag |
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157 | * xmp | |
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158 | * maker | maker => returns specifics tags from all the known |
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159 | * | makers |
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160 | * | |
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161 | * ---------------------+--------------------------------------------------- |
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162 | * |
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163 | * returned value is an array |
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164 | * each keys is a tag name and the associated value is a 2-level array |
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165 | * 'implemented' => Boolean, allowing to know if the tags is implemented or |
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166 | * not |
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167 | * 'name' => String, the tag name translated in locale language |
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168 | * |
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169 | * @Param Array $options (optional) |
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170 | * @return Array(keyName => Array( |
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171 | * 'implemented' => Boolean, |
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172 | * 'translatable' => Boolean, |
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173 | * 'name' => String)) |
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174 | */ |
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175 | static public function getTagList($options=Array()) |
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176 | { |
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177 | $default=Array( |
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178 | 'filter' => self::TAGFILTER_ALL, |
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179 | 'optimizeIptcDateTime' => false, |
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180 | 'exif' => true, |
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181 | 'iptc' => true, |
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182 | 'xmp' => true, |
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183 | 'maker' => true |
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184 | ); |
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185 | |
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186 | foreach($default as $key => $val) |
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187 | { |
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188 | if(array_key_exists($key, $options)) |
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189 | $default[$key]=$options[$key]; |
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190 | } |
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191 | |
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192 | $list=Array(); |
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193 | $returned=Array(); |
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194 | |
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195 | if($default['exif']) |
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196 | { |
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197 | $list[]="exif"; |
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198 | $list[]="gps"; |
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199 | } |
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200 | |
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201 | if($default['maker']) |
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202 | { |
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203 | $list[]=MAKER_PENTAX; |
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204 | } |
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205 | |
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206 | if($default['iptc']) |
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207 | $list[]="iptc"; |
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208 | |
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209 | if($default['xmp']) |
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210 | $list[]="xmp"; |
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211 | |
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212 | foreach($list as $val) |
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213 | { |
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214 | unset($tmp); |
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215 | |
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216 | switch($val) |
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217 | { |
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218 | case "exif": |
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219 | $tmp=new IfdTags(); |
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220 | $schema="exif"; |
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221 | break; |
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222 | case "gps": |
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223 | $tmp=new GpsTags(); |
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224 | $schema="exif.gps"; |
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225 | break; |
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226 | case "iptc": |
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227 | $tmp=new IptcTags(); |
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228 | $schema="iptc"; |
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229 | break; |
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230 | case "xmp": |
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231 | $tmp=new XmpTags(); |
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232 | $schema="xmp"; |
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233 | break; |
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234 | case MAKER_PENTAX: |
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235 | include_once(JPEG_METADATA_DIR."TagDefinitions/PentaxTags.class.php"); |
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236 | $tmp=new PentaxTags(); |
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237 | $schema="exif.".MAKER_PENTAX; |
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238 | break; |
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239 | default: |
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240 | $tmp=null; |
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241 | $schema="?"; |
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242 | break; |
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243 | } |
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244 | |
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245 | if(!is_null($tmp)) |
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246 | foreach($tmp->getTags() as $key => $tag) |
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247 | { |
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248 | if(self::filter(true, $tag['implemented'], $default['filter'])) |
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249 | { |
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250 | if(array_key_exists('tagName', $tag)) |
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251 | $name=$tag['tagName']; |
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252 | else |
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253 | $name=$key; |
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254 | |
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255 | if(array_key_exists('schema', $tag) and $val=="exif") |
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256 | $subSchema=".".$tag['schema']; |
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257 | else |
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258 | $subSchema=""; |
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259 | |
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260 | if($val=='xmp') |
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261 | $keyName=$schema.$subSchema.".".$key; |
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262 | else |
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263 | $keyName=$schema.$subSchema.".".$name; |
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264 | $returned[$keyName]=Array( |
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265 | 'implemented' => $tag['implemented'], |
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266 | 'translatable' => $tag['translatable'], |
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267 | 'name' => $name |
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268 | ); |
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269 | } |
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270 | } |
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271 | } |
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272 | |
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273 | return($returned); |
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274 | } |
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275 | |
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276 | |
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277 | /** |
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278 | * the filter function is used by the classe to determine if a tag is |
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279 | * filtered or not |
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280 | * |
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281 | * @Param Boolean $known |
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282 | * @Param Boolean $implemented |
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283 | * @Param Integer $filter |
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284 | * |
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285 | */ |
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286 | static public function filter($known, $implemented, $filter) |
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287 | { |
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288 | return(($known and (($filter & self::TAGFILTER_KNOWN) == self::TAGFILTER_KNOWN )) or |
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289 | ($implemented and (($filter & self::TAGFILTER_IMPLEMENTED) == self::TAGFILTER_IMPLEMENTED ))); |
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290 | } |
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291 | |
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292 | /** |
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293 | * the constructor need an optional filename and options |
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294 | * |
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295 | * if no filename is given, you can use the "load" function after the object |
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296 | * is instancied |
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297 | * |
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298 | * if no options are given, the class use the default values |
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299 | * |
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300 | * ---------------------+--------------------------------------------------- |
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301 | * key | descriptions/values |
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302 | * ---------------------+--------------------------------------------------- |
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303 | * filter | Integer |
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304 | * | This options is used to filter implemented tag |
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305 | * | JpegMetaData::TAGFILTER_ALL |
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306 | * | => returns all the tags |
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307 | * | JpegMetaData::TAGFILTER_IMPLEMENTED |
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308 | * | => returns only the implemented tags, not |
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309 | * | implemented tag are excluded |
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310 | * | JpegMetaData::TAGFILTER_KNOWN |
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311 | * | => returns only the known tags (implemented or |
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312 | * | not), unknown tag are excluded |
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313 | * | |
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314 | * optimizeIptcDateTime | Boolean |
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315 | * | IPTC Date/Time are separated into 2 tags |
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316 | * | if this option is set to true, only dates tags are |
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317 | * | returned (in this case, time is included is the |
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318 | * | date) |
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319 | * | |
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320 | * exif | Boolean |
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321 | * iptc | If set to true, the function returns all the tags |
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322 | * xmp | known for the specified type tag |
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323 | * | the exif parameter include the maker tags |
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324 | * | |
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325 | * ---------------------+--------------------------------------------------- |
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326 | * |
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327 | * @Param String $file (optional) |
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328 | * @Param Array $options (optional) |
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329 | * |
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330 | */ |
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331 | function __construct($file = "", $options = Array()) |
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332 | { |
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333 | $this->load($file, $options); |
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334 | } |
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335 | |
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336 | function __destruct() |
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337 | { |
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338 | $this->unsetAll(); |
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339 | } |
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340 | |
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341 | /** |
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342 | * load a file |
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343 | * |
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344 | * options values are the same than the constructor's options |
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345 | * |
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346 | * @Param String $file |
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347 | * @Param Array $options (optional) |
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348 | * |
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349 | */ |
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350 | public function load($file, $options = Array()) |
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351 | { |
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352 | $this->unsetAll(); |
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353 | |
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354 | $this->initializeOptions($options); |
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355 | $this->tags = Array(); |
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356 | $this->jpeg = new JpegReader($file); |
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357 | |
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358 | if($this->jpeg->isLoaded() and $this->jpeg->isValid()) |
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359 | { |
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360 | foreach($this->jpeg->getAppMarkerSegments() as $key => $appMarkerSegment) |
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361 | { |
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362 | if($appMarkerSegment->dataLoaded()) |
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363 | { |
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364 | $data=$appMarkerSegment->getData(); |
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365 | |
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366 | if($data instanceof TiffReader) |
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367 | { |
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368 | /* |
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369 | * Load Exifs tags from Tiff block |
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370 | */ |
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371 | if($data->getNbIFDs()>0) |
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372 | { |
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373 | $this->loadIfdTags($data->getIFD(0), self::KEY_EXIF_TIFF); |
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374 | } |
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375 | } |
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376 | elseif($data instanceof XmpReader) |
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377 | { |
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378 | /* |
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379 | * Load Xmp tags from Xmp block |
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380 | */ |
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381 | $this->loadTags($data->getTags(), self::KEY_XMP); |
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382 | } |
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383 | elseif($data instanceof IptcReader) |
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384 | { |
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385 | /* |
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386 | * Load IPTC tags from IPTC block |
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387 | */ |
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388 | if($this->options['optimizeIptcDateTime']) |
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389 | $data->optimizeDateTime(); |
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390 | |
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391 | $this->loadTags($data->getTags(), self::KEY_IPTC); |
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392 | } |
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393 | } |
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394 | } |
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395 | } |
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396 | } |
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397 | |
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398 | /** |
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399 | * This function returns an array of tags found in the loaded file |
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400 | * |
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401 | * It's possible to made a second selection to filter items |
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402 | * |
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403 | * ---------------------+--------------------------------------------------- |
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404 | * key | descriptions/values |
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405 | * ---------------------+--------------------------------------------------- |
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406 | * tagFilter | Integer |
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407 | * | This options is used to filter implemented tag |
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408 | * | JpegMetaData::TAGFILTER_ALL |
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409 | * | => returns all the tags |
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410 | * | JpegMetaData::TAGFILTER_IMPLEMENTED |
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411 | * | => returns only the implemented tags, not |
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412 | * | implemented tag are excluded |
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413 | * | JpegMetaData::TAGFILTER_KNOWN |
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414 | * | => returns only the known tags (implemented or |
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415 | * | not), unknown tag are excluded |
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416 | * | |
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417 | * ---------------------+--------------------------------------------------- |
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418 | * |
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419 | * Note, the filter is applied on loaded tags. If a filter was applied when |
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420 | * the file was loaded, you cannot expand the tag list, only reduce |
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421 | * example : |
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422 | * $jpegmd = new JpegMetadata($file, Array('filter' => JpegMetaData::TAGFILTER_IMPLEMENTED)); |
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423 | * => the unknown tag are not loaded |
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424 | * $jpegmd->getTags(JpegMetaData::TAGFILTER_ALL) |
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425 | * => unknown tag will not be restitued because they are not loaded... |
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426 | * |
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427 | * the function returns an array of Tag. |
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428 | * |
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429 | * |
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430 | * ===========> See the Tag.class.php to know all about a tag <============= |
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431 | * |
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432 | * @Param Integer $tagFilter (optional) |
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433 | * |
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434 | */ |
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435 | public function getTags($tagFilter = self::TAGFILTER_ALL) |
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436 | { |
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437 | $returned=Array(); |
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438 | foreach($this->tags as $key => $val) |
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439 | { |
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440 | if(self::filter($val->isKnown(), $val->isImplemented(), $tagFilter)) |
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441 | { |
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442 | $returned[$key]=$val; |
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443 | } |
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444 | } |
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445 | return($returned); |
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446 | } |
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447 | |
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448 | /** |
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449 | * initialize the options... |
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450 | * |
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451 | * @Param Array $options (optional) |
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452 | * |
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453 | */ |
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454 | private function initializeOptions($options=Array()) |
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455 | { |
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456 | $this->options = Array( |
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457 | 'filter' => self::TAGFILTER_ALL, |
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458 | 'optimizeIptcDateTime' => false, |
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459 | 'exif' => true, |
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460 | 'iptc' => true, |
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461 | 'xmp' => true |
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462 | ); |
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463 | |
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464 | foreach($this->options as $key => $val) |
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465 | { |
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466 | if(array_key_exists($key, $options)) |
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467 | $this->options[$key]=$options[$key]; |
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468 | } |
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469 | } |
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470 | |
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471 | /** |
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472 | * load tags from an IFD structure |
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473 | * |
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474 | * see Tiff.class.php and IfdReader.class.php for more informations |
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475 | * |
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476 | * @Param IfdReader $ifd |
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477 | * @Param String $exifKey |
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478 | * |
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479 | */ |
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480 | private function loadIfdTags($ifd, $exifKey) |
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481 | { |
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482 | foreach($ifd->getTags() as $key => $tag) |
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483 | { |
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484 | if(self::filter($tag->getTag()->isKnown(), $tag->getTag()->isImplemented(), $this->options['filter'])) |
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485 | { |
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486 | if($tag->getTag()->getLabel() instanceof IfdReader) |
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487 | { |
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488 | switch($tag->getTag()->getName()) |
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489 | { |
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490 | case 'Exif IFD Pointer': |
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491 | $exifKey2=self::KEY_EXIF_EXIF; |
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492 | break; |
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493 | case 'MakerNote': |
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494 | $exifKey2=self::KEY_EXIF.".".$tag->getTag()->getLabel()->getMaker(); |
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495 | break; |
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496 | case 'GPS IFD Pointer': |
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497 | $exifKey2=self::KEY_EXIF_GPS; |
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498 | break; |
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499 | default: |
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500 | $exifKey2=$exifKey; |
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501 | break; |
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502 | } |
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503 | $this->loadIfdTags($tag->getTag()->getLabel(), $exifKey2); |
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504 | } |
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505 | else |
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506 | { |
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507 | $this->tags[$exifKey.".".$tag->getTag()->getName()]=$tag->getTag(); |
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508 | } |
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509 | } |
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510 | } |
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511 | } |
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512 | |
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513 | /** |
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514 | * Used to load tags from an IPTc or XMP structure |
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515 | * |
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516 | * see IptcReader.class.php and XmpReader.class.php |
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517 | * |
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518 | * @Param Tag[] $ifd |
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519 | * @Param String $tagKey |
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520 | * |
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521 | */ |
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522 | private function loadTags($tags, $tagKey) |
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523 | { |
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524 | foreach($tags as $key => $tag) |
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525 | { |
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526 | if(self::filter($tag->isKnown(), $tag->isImplemented(), $this->options['filter'])) |
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527 | { |
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528 | $this->tags[$tagKey.".".$tag->getName()]=$tag; |
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529 | } |
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530 | } |
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531 | } |
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532 | |
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533 | private function unsetAll() |
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534 | { |
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535 | unset($this->tags); |
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536 | unset($this->jpeg); |
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537 | unset($this->options); |
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538 | } |
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539 | |
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540 | |
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541 | } // class JpegMetaData |
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542 | |
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543 | ?> |
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