<?php
// declare(encoding='UTF-8');
/**
 * Classe d'extraction de metadonnées d'un fichier JPEG afin de les mettre dans un tableau au format du CEL.
 *
 * @internal   Mininum PHP version : 5.2
 * @category   CEL
 * @package    Services
 * @subpackage Bibliothèques
 * @version    0.1
 * @author     Mathias CHOUET <mathias@tela-botanica.org>
 * @author     Jean-Pascal MILCENT <jpm@tela-botanica.org>
 * @author     Aurelien PERONNET <aurelien@tela-botanica.org>
 * @license    GPL v3 <http://www.gnu.org/licenses/gpl.txt>
 * @license    CECILL v2 <http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt>
 * @copyright  1999-2014 Tela Botanica <accueil@tela-botanica.org>
 */
class ExtracteurMetadonnees {

	private $meta = array();
	private $tableau_ids_tags_exif = array(
			'InteropIndex' => '1',
			'InteropVersion' => '2',
			'ProcessingSoftware' => '11',
			'SubfileType' => '254',
			'OldSubfileType' => '255',
			'ImageWidth' => '256',
			'ImageHeight' => '257',
			'BitsPerSample' => '258',
			'Compression' => '259',
			'PhotometricInterpretation' => '262',
			'Thresholding' => '263',
			'CellWidth' => '264',
			'CellLength' => '265',
			'FillOrder' => '266',
			'DocumentName' => '269',
			'ImageDescription' => '270',
			'Make' => '271',
			'Model' => '272',
			'StripOffsets' => '273',
			'Orientation' => '274',
			'SamplesPerPixel' => '277',
			'RowsPerStrip' => '278',
			'StripByteCounts' => '279',
			'MinSampleValue' => '280',
			'MaxSampleValue' => '281',
			'XResolution' => '282',
			'YResolution' => '283',
			'PlanarConfiguration' => '284',
			'PageName' => '285',
			'XPosition' => '286',
			'YPosition' => '287',
			'FreeOffsets' => '288',
			'FreeByteCounts' => '289',
			'GrayResponseUnit' => '290',
			'GrayResponseCurve' => '291',
			'T4Options' => '292',
			'T6Options' => '293',
			'ResolutionUnit' => '296',
			'PageNumber' => '297',
			'ColorResponseUnit' => '300',
			'TransferFunction' => '301',
			'Software' => '305',
			'ModifyDate' => '306',
			'Artist' => '315',
			'HostComputer' => '316',
			'Predictor' => '317',
			'WhitePoint' => '318',
			'PrimaryChromaticities' => '319',
			'ColorMap' => '320',
			'HalftoneHints' => '321',
			'TileWidth' => '322',
			'TileLength' => '323',
			'TileOffsets' => '324',
			'TileByteCounts' => '325',
			'BadFaxLines' => '326',
			'CleanFaxData' => '327',
			'ConsecutiveBadFaxLines' => '328',
			'SubIFD' => '330',
			'InkSet' => '332',
			'InkNames' => '333',
			'NumberofInks' => '334',
			'DotRange' => '336',
			'TargetPrinter' => '337',
			'ExtraSamples' => '338',
			'SampleFormat' => '339',
			'SMinSampleValue' => '340',
			'SMaxSampleValue' => '341',
			'TransferRange' => '342',
			'ClipPath' => '343',
			'XClipPathUnits' => '344',
			'YClipPathUnits' => '345',
			'Indexed' => '346',
			'JPEGTables' => '347',
			'OPIProxy' => '351',
			'GlobalParametersIFD' => '400',
			'ProfileType' => '401',
			'FaxProfile' => '402',
			'CodingMethods' => '403',
			'VersionYear' => '404',
			'ModeNumber' => '405',
			'Decode' => '433',
			'DefaultImageColor' => '434',
			'T82Options' => '435',
			'JPEGTables' => '437',
			'JPEGProc' => '512',
			'ThumbnailOffset' => '513',
			'ThumbnailLength' => '514',
			'JPEGRestartInterval' => '515',
			'JPEGLosslessPredictors' => '517',
			'JPEGPointTransforms' => '518',
			'JPEGQTables' => '519',
			'JPEGDCTables' => '520',
			'JPEGACTables' => '521',
			'YCbCrCoefficients' => '529',
			'YCbCrSubSampling' => '530',
			'YCbCrPositioning' => '531',
			'ReferenceBlackWhite' => '532',
			'StripRowCounts' => '559',
			'ApplicationNotes' => '700',
			'USPTOMiscellaneous' => '999',
			'RelatedImageFileFormat' => '4096',
			'RelatedImageWidth' => '4097',
			'RelatedImageHeight' => '4098',
			'Rating' => '18246',
			'XP_DIP_XML' => '18247',
			'StitchInfo' => '18248',
			'RatingPercent' => '18249',
			'ImageID' => '32781',
			'WangTag1' => '32931',
			'WangAnnotation' => '32932',
			'WangTag3' => '32933',
			'WangTag4' => '32934',
			'Matteing' => '32995',
			'DataType' => '32996',
			'ImageDepth' => '32997',
			'TileDepth' => '32998',
			'Model2' => '33405',
			'CFARepeatPatternDim' => '33421',
			'CFAPattern2' => '33422',
			'BatteryLevel' => '33423',
			'KodakIFD' => '33424',
			'Copyright' => '33432',
			'ExposureTime' => '33434',
			'FNumber' => '33437',
			'MDFileTag' => '33445',
			'MDScalePixel' => '33446',
			'MDColorTable' => '33447',
			'MDLabName' => '33448',
			'MDSampleInfo' => '33449',
			'MDPrepDate' => '33450',
			'MDPrepTime' => '33451',
			'MDFileUnits' => '33452',
			'PixelScale' => '33550',
			'AdventScale' => '33589',
			'AdventRevision' => '33590',
			'UIC1Tag' => '33628',
			'UIC2Tag' => '33629',
			'UIC3Tag' => '33630',
			'UIC4Tag' => '33631',
			'IPTC-NAA' => '33723',
			'IntergraphPacketData' => '33918',
			'IntergraphFlagRegisters' => '33919',
			'IntergraphMatrix' => '33920',
			'INGRReserved' => '33921',
			'ModelTiePoint' => '33922',
			'Site' => '34016',
			'ColorSequence' => '34017',
			'IT8Header' => '34018',
			'RasterPadding' => '34019',
			'BitsPerRunLength' => '34020',
			'BitsPerExtendedRunLength' => '34021',
			'ColorTable' => '34022',
			'ImageColorIndicator' => '34023',
			'BackgroundColorIndicator' => '34024',
			'ImageColorValue' => '34025',
			'BackgroundColorValue' => '34026',
			'PixelIntensityRange' => '34027',
			'TransparencyIndicator' => '34028',
			'ColorCharacterization' => '34029',
			'HCUsage' => '34030',
			'TrapIndicator' => '34031',
			'CMYKEquivalent' => '34032',
			'SEMInfo' => '34118',
			'AFCP_IPTC' => '34152',
			'PixelMagicJBIGOptions' => '34232',
			'ModelTransform' => '34264',
			'WB_GRGBLevels' => '34306',
			'LeafData' => '34310',
			'PhotoshopSettings' => '34377',
			'ExifOffset' => '34665',
			'ICC_Profile' => '34675',
			'TIFF_FXExtensions' => '34687',
			'MultiProfiles' => '34688',
			'SharedData' => '34689',
			'T88Options' => '34690',
			'ImageLayer' => '34732',
			'GeoTiffDirectory' => '34735',
			'GeoTiffDoubleParams' => '34736',
			'GeoTiffAsciiParams' => '34737',
			'ExposureProgram' => '34850',
			'SpectralSensitivity' => '34852',
			'GPSInfo' => '34853',
			'ISO' => '34855',
			'Opto-ElectricConvFactor' => '34856',
			'Interlace' => '34857',
			'TimeZoneOffset' => '34858',
			'SelfTimerMode' => '34859',
			'SensitivityType' => '34864',
			'StandardOutputSensitivity' => '34865',
			'RecommendedExposureIndex' => '34866',
			'ISOSpeed' => '34867',
			'ISOSpeedLatitudeyyy' => '34868',
			'ISOSpeedLatitudezzz' => '34869',
			'FaxRecvParams' => '34908',
			'FaxSubAddress' => '34909',
			'FaxRecvTime' => '34910',
			'LeafSubIFD' => '34954',
			'ExifVersion' => '36864',
			'DateTimeOriginal' => '36867',
			'CreateDate' => '36868',
			'ComponentsConfiguration' => '37121',
			'CompressedBitsPerPixel' => '37122',
			'ShutterSpeedValue' => '37377',
			'ApertureValue' => '37378',
			'BrightnessValue' => '37379',
			'ExposureCompensation' => '37380',
			'MaxApertureValue' => '37381',
			'SubjectDistance' => '37382',
			'MeteringMode' => '37383',
			'LightSource' => '37384',
			'Flash' => '37385',
			'FocalLength' => '37386',
			'FlashEnergy' => '37387',
			'SpatialFrequencyResponse' => '37388',
			'Noise' => '37389',
			'FocalPlaneXResolution' => '37390',
			'FocalPlaneYResolution' => '37391',
			'FocalPlaneResolutionUnit' => '37392',
			'ImageNumber' => '37393',
			'SecurityClassification' => '37394',
			'ImageHistory' => '37395',
			'SubjectArea' => '37396',
			'ExposureIndex' => '37397',
			'TIFF-EPStandardID' => '37398',
			'SensingMethod' => '37399',
			'CIP3DataFile' => '37434',
			'CIP3Sheet' => '37435',
			'CIP3Side' => '37436',
			'StoNits' => '37439',
			'MakerNoteCanon' => '37500',
			'UserComment' => '37510',
			'SubSecTime' => '37520',
			'SubSecTimeOriginal' => '37521',
			'SubSecTimeDigitized' => '37522',
			'MSDocumentText' => '37679',
			'MSPropertySetStorage' => '37680',
			'MSDocumentTextPosition' => '37681',
			'ImageSourceData' => '37724',
			'XPTitle' => '40091',
			'XPComment' => '40092',
			'XPAuthor' => '40093',
			'XPKeywords' => '40094',
			'XPSubject' => '40095',
			'FlashpixVersion' => '40960',
			'ColorSpace' => '40961',
			'ExifImageWidth' => '40962',
			'ExifImageHeight' => '40963',
			'RelatedSoundFile' => '40964',
			'InteropOffset' => '40965',
			'FlashEnergy' => '41483',
			'SpatialFrequencyResponse' => '41484',
			'Noise' => '41485',
			'FocalPlaneXResolution' => '41486',
			'FocalPlaneYResolution' => '41487',
			'FocalPlaneResolutionUnit' => '41488',
			'ImageNumber' => '41489',
			'SecurityClassification' => '41490',
			'ImageHistory' => '41491',
			'SubjectLocation' => '41492',
			'ExposureIndex' => '41493',
			'TIFF-EPStandardID' => '41494',
			'SensingMethod' => '41495',
			'FileSource' => '41728',
			'SceneType' => '41729',
			'CFAPattern' => '41730',
			'CustomRendered' => '41985',
			'ExposureMode' => '41986',
			'WhiteBalance' => '41987',
			'DigitalZoomRatio' => '41988',
			'FocalLengthIn35mmFormat' => '41989',
			'SceneCaptureType' => '41990',
			'GainControl' => '41991',
			'Contrast' => '41992',
			'Saturation' => '41993',
			'Sharpness' => '41994',
			'DeviceSettingDescription' => '41995',
			'SubjectDistanceRange' => '41996',
			'ImageUniqueID' => '42016',
			'OwnerName' => '42032',
			'SerialNumber' => '42033',
			'LensInfo' => '42034',
			'LensMake' => '42035',
			'LensModel' => '42036',
			'LensSerialNumber' => '42037',
			'GDALMetadata' => '42112',
			'GDALNoData' => '42113',
			'Gamma' => '42240',
			'ExpandSoftware' => '44992',
			'ExpandLens' => '44993',
			'ExpandFilm' => '44994',
			'ExpandFilterLens' => '44995',
			'ExpandScanner' => '44996',
			'ExpandFlashLamp' => '44997',
			'PixelFormat' => '48129',
			'Transformation' => '48130',
			'Uncompressed' => '48131',
			'ImageType' => '48132',
			'ImageWidth' => '48256',
			'ImageHeight' => '48257',
			'WidthResolution' => '48258',
			'HeightResolution' => '48259',
			'ImageOffset' => '48320',
			'ImageByteCount' => '48321',
			'AlphaOffset' => '48322',
			'AlphaByteCount' => '48323',
			'ImageDataDiscard' => '48324',
			'AlphaDataDiscard' => '48325',
			'OceScanjobDesc' => '50215',
			'OceApplicationSelector' => '50216',
			'OceIDNumber' => '50217',
			'OceImageLogic' => '50218',
			'Annotations' => '50255',
			'PrintIM' => '50341',
			'USPTOOriginalContentType' => '50560',
			'DNGVersion' => '50706',
			'DNGBackwardVersion' => '50707',
			'UniqueCameraModel' => '50708',
			'LocalizedCameraModel' => '50709',
			'CFAPlaneColor' => '50710',
			'CFALayout' => '50711',
			'LinearizationTable' => '50712',
			'BlackLevelRepeatDim' => '50713',
			'BlackLevel' => '50714',
			'BlackLevelDeltaH' => '50715',
			'BlackLevelDeltaV' => '50716',
			'WhiteLevel' => '50717',
			'DefaultScale' => '50718',
			'DefaultCropOrigin' => '50719',
			'DefaultCropSize' => '50720',
			'ColorMatrix1' => '50721',
			'ColorMatrix2' => '50722',
			'CameraCalibration1' => '50723',
			'CameraCalibration2' => '50724',
			'ReductionMatrix1' => '50725',
			'ReductionMatrix2' => '50726',
			'AnalogBalance' => '50727',
			'AsShotNeutral' => '50728',
			'AsShotWhiteXY' => '50729',
			'BaselineExposure' => '50730',
			'BaselineNoise' => '50731',
			'BaselineSharpness' => '50732',
			'BayerGreenSplit' => '50733',
			'LinearResponseLimit' => '50734',
			'CameraSerialNumber' => '50735',
			'DNGLensInfo' => '50736',
			'ChromaBlurRadius' => '50737',
			'AntiAliasStrength' => '50738',
			'ShadowScale' => '50739',
			'SR2Private' => '50740',
			'MakerNoteSafety' => '50741',
			'RawImageSegmentation' => '50752',
			'CalibrationIlluminant1' => '50778',
			'CalibrationIlluminant2' => '50779',
			'BestQualityScale' => '50780',
			'RawDataUniqueID' => '50781',
			'AliasLayerMetadata' => '50784',
			'OriginalRawFileName' => '50827',
			'OriginalRawFileData' => '50828',
			'ActiveArea' => '50829',
			'MaskedAreas' => '50830',
			'AsShotICCProfile' => '50831',
			'AsShotPreProfileMatrix' => '50832',
			'CurrentICCProfile' => '50833',
			'CurrentPreProfileMatrix' => '50834',
			'ColorimetricReference' => '50879',
			'PanasonicTitle' => '50898',
			'PanasonicTitle2' => '50899',
			'CameraCalibrationSig' => '50931',
			'ProfileCalibrationSig' => '50932',
			'ProfileIFD' => '50933',
			'AsShotProfileName' => '50934',
			'NoiseReductionApplied' => '50935',
			'ProfileName' => '50936',
			'ProfileHueSatMapDims' => '50937',
			'ProfileHueSatMapData1' => '50938',
			'ProfileHueSatMapData2' => '50939',
			'ProfileToneCurve' => '50940',
			'ProfileEmbedPolicy' => '50941',
			'ProfileCopyright' => '50942',
			'ForwardMatrix1' => '50964',
			'ForwardMatrix2' => '50965',
			'PreviewApplicationName' => '50966',
			'PreviewApplicationVersion' => '50967',
			'PreviewSettingsName' => '50968',
			'PreviewSettingsDigest' => '50969',
			'PreviewColorSpace' => '50970',
			'PreviewDateTime' => '50971',
			'RawImageDigest' => '50972',
			'OriginalRawFileDigest' => '50973',
			'SubTileBlockSize' => '50974',
			'RowInterleaveFactor' => '50975',
			'ProfileLookTableDims' => '50981',
			'ProfileLookTableData' => '50982',
			'OpcodeList1' => '51008',
			'OpcodeList2' => '51009',
			'OpcodeList3' => '51022',
			'NoiseProfile' => '51041',
			'Padding' => '59932',
			'OffsetSchema' => '59933',
			'OwnerName' => '65000',
			'SerialNumber' => '65001',
			'Lens' => '65002',
			'KDC_IFD' => '65024',
			'RawFile' => '65100',
			'Converter' => '65101',
			'WhiteBalance' => '65102',
			'Exposure' => '65105',
			'Shadows' => '65106',
			'Brightness' => '65107',
			'Contrast' => '65108',
			'Saturation' => '65109',
			'Sharpness' => '65110',
			'Smoothness' => '65111',
			'MoireFilter' => '65112',
	);

	public function extraireMetadonnees($cheminImage) {
		if ($this->peutUtiliserExifTool()) {
			$this->meta = $this->decoderMetadonneesExifTool($cheminImage);
		} else {
			$this->meta = $this->decoderMetadonneesBasique($cheminImage);
		}

		$metadonnees = array();
		$metadonnees['hauteur'] = $this->obtenirHauteur();
		$metadonnees['largeur'] = $this->obtenirLargeur();
		$metadonnees['date_prise_de_vue'] = $this->obtenirDatePriseDeVue();
		$metadonnees['appareil_fabriquant'] = $this->obtenirAppareilFabricant();
		$metadonnees['appareil_modele'] = $this->obtenirAppareilModele();
		$metadonnees['meta_exif'] = $this->convertirMetaVersXML('EXIF');
		$metadonnees['meta_iptc'] = $this->convertirMetaVersXML('IPTC');
		$metadonnees['meta_xmp'] = $this->convertirMetaVersXML('XMP');
		$metadonnees['meta_makernote'] = $this->convertirMetaVersXML('MAKERNOTE');
		return $metadonnees;
	}

	private function peutUtiliserExifTool() {
		// TODO indiquer ceci dans un fichier de config
		return file_exists('/usr/bin/exiftool') && is_executable('/usr/bin/exiftool');
	}

	private function decoderMetadonneesExifTool($cheminImage) {
		$metadata = array();
		$res = exec('/usr/bin/exiftool -g -D "'.$cheminImage.'"', $metadata);

		$metadata_decodees = array();
		$categorie = '';
		foreach($metadata as &$data) {
			if ($this->estUnSeparateurCategorieExifTool($data)) {
				$categorie = trim(str_replace('----', '', $data));
			} else {
				$data_decodee = $this->parserValeurMetadonneeExifTool($data);
				$cle_metadonnee = str_replace(' ', '', $data_decodee['cle']);
				$metadata_decodees[$categorie][$cle_metadonnee] = $data_decodee;
			}
		}
		return $metadata_decodees;
	}

	private function estUnSeparateurCategorieExifTool($data) {
		return preg_match('^---- (.)* ----^',$data);
	}

	private function parserValeurMetadonneeExifTool($data) {
		$cle_valeur = explode(':',$data,2);

		$valeur = '';
		if(count($cle_valeur) == 2) {
			$valeur	= trim($cle_valeur[1]);
		}

		$id_cle = explode(' ',trim($cle_valeur[0]),2);

		$id_cle[1] = str_replace(array('-','/'),'',$id_cle[1]);

		$cle_id_valeur = array('cle' => $id_cle[1], 'id' => str_replace('-','',$id_cle[0]), 'valeur' => $valeur);
		return $cle_id_valeur;
	}

	public function decoderMetadonneesBasique($chemin_fichier) {
		$exif = @exif_read_data($chemin_fichier, "EXIF,COMPUTED,IFD0,FILE,COMMENT", true, false);

		// tant pis pour les makernote et xmp, les décoder demande trop de librairies externes, autant installer exiftool alors
		$metadonnees = array();
		$metadonnees['XMP'] = array();
		unset($metadonnees['EXIF']['MakerNote']);
		$metadonnees['MAKERNOTE'] = array();
		$metadonnees_non_formatees = array();
		if(isset($exif['EXIF'])) {
			$metadonnees_non_formatees = array_merge($metadonnees_non_formatees, $exif['EXIF']);
		}
		if(isset($exif['IFD0'])) {
			$metadonnees_non_formatees = array_merge($metadonnees_non_formatees, $exif['IFD0']);
		}
		$metadonnees['EXIF'] = $this->formaterTableauExif($metadonnees_non_formatees);
		$metadonnees['IPTC'] = $this->extraireIptc($chemin_fichier);
		$metadonnees['File'] = array(
			'ImageWidth' => array('id' => '', 'valeur' => $exif['COMPUTED']['Width']),
			'ImageHeight' => array('id' => '', 'valeur' => $exif['COMPUTED']['Height']));
		return $metadonnees ;
	}

	private function formaterTableauExif(&$tableau) {
		$tableau_exif_formate = array();

		foreach ($tableau as $nom_tag => $valeur) {
			$id = '';
			if (isset($this->tableau_ids_tags_exif[$nom_tag])) {
				$id = $this->tableau_ids_tags_exif[$nom_tag];
			}
			$tableau_exif_formate[$nom_tag] = array('id' => $id, 'valeur' => $valeur);
		}

		return $tableau_exif_formate;
	}

	/**
	 * Extraction des metadonnées iptc
	 */
	public function extraireIptc($chemin_fichier) {
		$meta = array();

		// getimagesize renvoie les infos iptc dans le tableau info
		$info = array();
		$size = getimagesize($chemin_fichier, $info);

		// s'il existe
		if (isset($info['APP13'])) {
			// on parse les donnees
			$iptc = iptcparse($info['APP13']);
			if ($iptc) {
				// et on les analyse
				foreach ($iptc as $marker => $section) {
					foreach ($section as $nom => $val) {
						// pour remplir le tableau de donnees
						$this->decoderValeurIptc($marker, $val, $meta);
					}
				}
			}
		}
		return $meta;
	}

	/**
	* Stocke une valeur de metadonnées iptc dans le champ du tableau correspondant
	* @param String $nom nom de la valeur
	* @param String $val valeur
	* @param String $data référence vers le tableau où la donnée sera stockée
	**/
	private function decoderValeurIptc($nom, $val, &$data_tab) {
		switch ($nom) {
			case "2#005" :// mots cles iptc
				$data_tab['Category'] = array('id' => '5', 'valeur' => $val);
				break;
			case "2#080" :// champ by line
				$data_tab['By-Line']  = array('id' => '80', 'valeur' => $val);
				break ;
			case "2#085" :// champ by line titre
				$data_tab['By-LineTitle'] = array('id' => '85', 'valeur' => $val);
				break ;
			case "2#090" :// ville
				$data_tab['City'] = array('id' => '90', 'valeur' => $val);
				break ;
			case "2#092" :// sous location
				$data_tab['SubLocation'] = array('id' => '92', 'valeur' => $val);
				break ;
			case "2#095" :// etat (pour les us)
				$data_tab['ProvinceState'] = array('id' => '95', 'valeur' => $val);
				break ;
			case "2#100" :// code pays
				$data_tab['CountryPrimaryLocationCode'] = array('id' => '100', 'valeur' => $val);
				break ;
			case "2#101" :// code pays
				$data_tab['CountryName'] = array('id' => '101', 'valeur' => $val);
				break ;
			case "2#105" :// titre principal
				$data_tab['Headline'] = array('id' => '105', 'valeur' => $val);
				break ;
			case "2#110" :// credit
				$data_tab['Credit'] = array('id' => '110', 'valeur' => $val);
				break ;
			case "2#116" :// copyright
				$data_tab['CopyrightNotice'] = array('id' => '116', 'valeur' => $val);
				break ;
			case "2#118" :// contact
				$data_tab['Contact'] = array('id' => '118', 'valeur' => $val);
				break ;
			default:
				unset($data_tab['nom']);
		}
	}

	private function obtenirHauteur() {
		$hauteur = isset($this->meta['File']['ImageHeight']) ? $this->meta['File']['ImageHeight']['valeur'] : '';
		return $hauteur;
	}

	private function obtenirLargeur() {
		$largeur = isset($this->meta['File']['ImageWidth']) ? $this->meta['File']['ImageWidth']['valeur'] : '';
		return $largeur;
	}

	private function obtenirDatePriseDeVue() {
		$date = isset($this->meta['EXIF']['DateTimeOriginal']) ? $this->meta['EXIF']['DateTimeOriginal']['valeur'] : '';
		return $date;
	}

	private function obtenirAppareilFabricant() {
		$fabriquant = isset($this->meta['EXIF']['Make']) ? $this->meta['EXIF']['Make']['valeur'] : '';
		return $fabriquant;
	}

	private function obtenirAppareilModele() {
		$modele = isset($this->meta['EXIF']['CameraModelName']) ? $this->meta['EXIF']['CameraModelName']['valeur'] : '';
		return $modele;
	}

	private function convertirMetaVersXML($type) {
		$xml = null;
		if (isset($this->meta[$type])) {
			$racine = strtolower($type);

			$xml = '<?xml version="1.0" encoding="UTF-8" ?>'."\n";
			$xml .= "<$racine>"."\n";
			foreach ($this->meta[$type] as $prop => &$valeur) {
				$xml .= '<'.$prop.' id="'.$valeur['id'].'">'.$valeur['valeur'].'</'.$prop.'>'."\n";
			}
			$xml .= "</$racine>";
		}
		return $xml;
	}
}