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630 lines
18 KiB
630 lines
18 KiB
/*
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* Javascript EXIF Reader 0.1.4
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* Copyright (c) 2008 Jacob Seidelin, cupboy@gmail.com, http://blog.nihilogic.dk/
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* Licensed under the MPL License [http://www.nihilogic.dk/licenses/mpl-license.txt]
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*/
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var EXIF = {};
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(function() {
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var bDebug = false;
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EXIF.Tags = {
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// version tags
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0x9000 : "ExifVersion", // EXIF version
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0xA000 : "FlashpixVersion", // Flashpix format version
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// colorspace tags
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0xA001 : "ColorSpace", // Color space information tag
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// image configuration
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0xA002 : "PixelXDimension", // Valid width of meaningful image
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0xA003 : "PixelYDimension", // Valid height of meaningful image
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0x9101 : "ComponentsConfiguration", // Information about channels
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0x9102 : "CompressedBitsPerPixel", // Compressed bits per pixel
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// user information
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0x927C : "MakerNote", // Any desired information written by the manufacturer
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0x9286 : "UserComment", // Comments by user
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// related file
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0xA004 : "RelatedSoundFile", // Name of related sound file
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// date and time
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0x9003 : "DateTimeOriginal", // Date and time when the original image was generated
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0x9004 : "DateTimeDigitized", // Date and time when the image was stored digitally
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0x9290 : "SubsecTime", // Fractions of seconds for DateTime
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0x9291 : "SubsecTimeOriginal", // Fractions of seconds for DateTimeOriginal
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0x9292 : "SubsecTimeDigitized", // Fractions of seconds for DateTimeDigitized
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// picture-taking conditions
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0x829A : "ExposureTime", // Exposure time (in seconds)
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0x829D : "FNumber", // F number
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0x8822 : "ExposureProgram", // Exposure program
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0x8824 : "SpectralSensitivity", // Spectral sensitivity
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0x8827 : "ISOSpeedRatings", // ISO speed rating
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0x8828 : "OECF", // Optoelectric conversion factor
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0x9201 : "ShutterSpeedValue", // Shutter speed
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0x9202 : "ApertureValue", // Lens aperture
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0x9203 : "BrightnessValue", // Value of brightness
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0x9204 : "ExposureBias", // Exposure bias
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0x9205 : "MaxApertureValue", // Smallest F number of lens
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0x9206 : "SubjectDistance", // Distance to subject in meters
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0x9207 : "MeteringMode", // Metering mode
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0x9208 : "LightSource", // Kind of light source
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0x9209 : "Flash", // Flash status
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0x9214 : "SubjectArea", // Location and area of main subject
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0x920A : "FocalLength", // Focal length of the lens in mm
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0xA20B : "FlashEnergy", // Strobe energy in BCPS
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0xA20C : "SpatialFrequencyResponse", //
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0xA20E : "FocalPlaneXResolution", // Number of pixels in width direction per FocalPlaneResolutionUnit
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0xA20F : "FocalPlaneYResolution", // Number of pixels in height direction per FocalPlaneResolutionUnit
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0xA210 : "FocalPlaneResolutionUnit", // Unit for measuring FocalPlaneXResolution and FocalPlaneYResolution
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0xA214 : "SubjectLocation", // Location of subject in image
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0xA215 : "ExposureIndex", // Exposure index selected on camera
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0xA217 : "SensingMethod", // Image sensor type
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0xA300 : "FileSource", // Image source (3 == DSC)
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0xA301 : "SceneType", // Scene type (1 == directly photographed)
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0xA302 : "CFAPattern", // Color filter array geometric pattern
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0xA401 : "CustomRendered", // Special processing
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0xA402 : "ExposureMode", // Exposure mode
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0xA403 : "WhiteBalance", // 1 = auto white balance, 2 = manual
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0xA404 : "DigitalZoomRation", // Digital zoom ratio
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0xA405 : "FocalLengthIn35mmFilm", // Equivalent foacl length assuming 35mm film camera (in mm)
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0xA406 : "SceneCaptureType", // Type of scene
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0xA407 : "GainControl", // Degree of overall image gain adjustment
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0xA408 : "Contrast", // Direction of contrast processing applied by camera
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0xA409 : "Saturation", // Direction of saturation processing applied by camera
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0xA40A : "Sharpness", // Direction of sharpness processing applied by camera
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0xA40B : "DeviceSettingDescription", //
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0xA40C : "SubjectDistanceRange", // Distance to subject
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// other tags
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0xA005 : "InteroperabilityIFDPointer",
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0xA420 : "ImageUniqueID" // Identifier assigned uniquely to each image
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};
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EXIF.TiffTags = {
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0x0100 : "ImageWidth",
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0x0101 : "ImageHeight",
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0x8769 : "ExifIFDPointer",
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0x8825 : "GPSInfoIFDPointer",
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0xA005 : "InteroperabilityIFDPointer",
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0x0102 : "BitsPerSample",
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0x0103 : "Compression",
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0x0106 : "PhotometricInterpretation",
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0x0112 : "Orientation",
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0x0115 : "SamplesPerPixel",
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0x011C : "PlanarConfiguration",
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0x0212 : "YCbCrSubSampling",
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0x0213 : "YCbCrPositioning",
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0x011A : "XResolution",
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0x011B : "YResolution",
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0x0128 : "ResolutionUnit",
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0x0111 : "StripOffsets",
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0x0116 : "RowsPerStrip",
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0x0117 : "StripByteCounts",
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0x0201 : "JPEGInterchangeFormat",
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0x0202 : "JPEGInterchangeFormatLength",
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0x012D : "TransferFunction",
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0x013E : "WhitePoint",
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0x013F : "PrimaryChromaticities",
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0x0211 : "YCbCrCoefficients",
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0x0214 : "ReferenceBlackWhite",
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0x0132 : "DateTime",
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0x010E : "ImageDescription",
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0x010F : "Make",
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0x0110 : "Model",
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0x0131 : "Software",
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0x013B : "Artist",
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0x8298 : "Copyright"
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}
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EXIF.GPSTags = {
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0x0000 : "GPSVersionID",
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0x0001 : "GPSLatitudeRef",
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0x0002 : "GPSLatitude",
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0x0003 : "GPSLongitudeRef",
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0x0004 : "GPSLongitude",
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0x0005 : "GPSAltitudeRef",
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0x0006 : "GPSAltitude",
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0x0007 : "GPSTimeStamp",
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0x0008 : "GPSSatellites",
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0x0009 : "GPSStatus",
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0x000A : "GPSMeasureMode",
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0x000B : "GPSDOP",
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0x000C : "GPSSpeedRef",
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0x000D : "GPSSpeed",
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0x000E : "GPSTrackRef",
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0x000F : "GPSTrack",
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0x0010 : "GPSImgDirectionRef",
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0x0011 : "GPSImgDirection",
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0x0012 : "GPSMapDatum",
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0x0013 : "GPSDestLatitudeRef",
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0x0014 : "GPSDestLatitude",
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0x0015 : "GPSDestLongitudeRef",
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0x0016 : "GPSDestLongitude",
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0x0017 : "GPSDestBearingRef",
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0x0018 : "GPSDestBearing",
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0x0019 : "GPSDestDistanceRef",
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0x001A : "GPSDestDistance",
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0x001B : "GPSProcessingMethod",
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0x001C : "GPSAreaInformation",
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0x001D : "GPSDateStamp",
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0x001E : "GPSDifferential"
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}
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EXIF.StringValues = {
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ExposureProgram : {
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0 : "Not defined",
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1 : "Manual",
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2 : "Normal program",
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3 : "Aperture priority",
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4 : "Shutter priority",
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5 : "Creative program",
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6 : "Action program",
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7 : "Portrait mode",
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8 : "Landscape mode"
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},
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MeteringMode : {
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0 : "Unknown",
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1 : "Average",
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2 : "CenterWeightedAverage",
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3 : "Spot",
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4 : "MultiSpot",
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5 : "Pattern",
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6 : "Partial",
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255 : "Other"
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},
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LightSource : {
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0 : "Unknown",
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1 : "Daylight",
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2 : "Fluorescent",
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3 : "Tungsten (incandescent light)",
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4 : "Flash",
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9 : "Fine weather",
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10 : "Cloudy weather",
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11 : "Shade",
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12 : "Daylight fluorescent (D 5700 - 7100K)",
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13 : "Day white fluorescent (N 4600 - 5400K)",
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14 : "Cool white fluorescent (W 3900 - 4500K)",
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15 : "White fluorescent (WW 3200 - 3700K)",
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17 : "Standard light A",
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18 : "Standard light B",
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19 : "Standard light C",
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20 : "D55",
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21 : "D65",
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22 : "D75",
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23 : "D50",
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24 : "ISO studio tungsten",
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255 : "Other"
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},
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Flash : {
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0x0000 : "Flash did not fire",
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0x0001 : "Flash fired",
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0x0005 : "Strobe return light not detected",
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0x0007 : "Strobe return light detected",
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0x0009 : "Flash fired, compulsory flash mode",
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0x000D : "Flash fired, compulsory flash mode, return light not detected",
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0x000F : "Flash fired, compulsory flash mode, return light detected",
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0x0010 : "Flash did not fire, compulsory flash mode",
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0x0018 : "Flash did not fire, auto mode",
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0x0019 : "Flash fired, auto mode",
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0x001D : "Flash fired, auto mode, return light not detected",
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0x001F : "Flash fired, auto mode, return light detected",
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0x0020 : "No flash function",
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0x0041 : "Flash fired, red-eye reduction mode",
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0x0045 : "Flash fired, red-eye reduction mode, return light not detected",
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0x0047 : "Flash fired, red-eye reduction mode, return light detected",
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0x0049 : "Flash fired, compulsory flash mode, red-eye reduction mode",
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0x004D : "Flash fired, compulsory flash mode, red-eye reduction mode, return light not detected",
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0x004F : "Flash fired, compulsory flash mode, red-eye reduction mode, return light detected",
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0x0059 : "Flash fired, auto mode, red-eye reduction mode",
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0x005D : "Flash fired, auto mode, return light not detected, red-eye reduction mode",
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0x005F : "Flash fired, auto mode, return light detected, red-eye reduction mode"
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},
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SensingMethod : {
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1 : "Not defined",
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2 : "One-chip color area sensor",
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3 : "Two-chip color area sensor",
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4 : "Three-chip color area sensor",
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5 : "Color sequential area sensor",
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7 : "Trilinear sensor",
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8 : "Color sequential linear sensor"
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},
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SceneCaptureType : {
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0 : "Standard",
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1 : "Landscape",
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2 : "Portrait",
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3 : "Night scene"
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},
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SceneType : {
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1 : "Directly photographed"
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},
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CustomRendered : {
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0 : "Normal process",
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1 : "Custom process"
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},
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WhiteBalance : {
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0 : "Auto white balance",
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1 : "Manual white balance"
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},
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GainControl : {
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0 : "None",
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1 : "Low gain up",
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2 : "High gain up",
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3 : "Low gain down",
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4 : "High gain down"
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},
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Contrast : {
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0 : "Normal",
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1 : "Soft",
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2 : "Hard"
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},
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Saturation : {
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0 : "Normal",
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1 : "Low saturation",
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2 : "High saturation"
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},
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Sharpness : {
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0 : "Normal",
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1 : "Soft",
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2 : "Hard"
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},
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SubjectDistanceRange : {
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0 : "Unknown",
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1 : "Macro",
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2 : "Close view",
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3 : "Distant view"
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},
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FileSource : {
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3 : "DSC"
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},
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Components : {
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0 : "",
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1 : "Y",
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2 : "Cb",
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3 : "Cr",
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4 : "R",
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5 : "G",
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6 : "B"
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}
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}
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function addEvent(oElement, strEvent, fncHandler)
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{
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if (oElement.addEventListener) {
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oElement.addEventListener(strEvent, fncHandler, false);
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} else if (oElement.attachEvent) {
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oElement.attachEvent("on" + strEvent, fncHandler);
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}
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}
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function imageHasData(oImg)
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{
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return !!(oImg.exifdata);
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}
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function getImageData(oImg, fncCallback)
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{
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BinaryAjax(
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oImg.src,
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function(oHTTP) {
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var oEXIF = findEXIFinJPEG(oHTTP.binaryResponse);
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oImg.exifdata = oEXIF || {};
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if (fncCallback) fncCallback();
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}
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)
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}
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function findEXIFinJPEG(oFile) {
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var aMarkers = [];
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if (oFile.getByteAt(0) != 0xFF || oFile.getByteAt(1) != 0xD8) {
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return false; // not a valid jpeg
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}
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var iOffset = 2;
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var iLength = oFile.getLength();
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while (iOffset < iLength) {
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if (oFile.getByteAt(iOffset) != 0xFF) {
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if (bDebug) console.log("Not a valid marker at offset " + iOffset + ", found: " + oFile.getByteAt(iOffset));
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return false; // not a valid marker, something is wrong
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}
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var iMarker = oFile.getByteAt(iOffset+1);
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// we could implement handling for other markers here,
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// but we're only looking for 0xFFE1 for EXIF data
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if (iMarker == 22400) {
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if (bDebug) console.log("Found 0xFFE1 marker");
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return readEXIFData(oFile, iOffset + 4, oFile.getShortAt(iOffset+2, true)-2);
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iOffset += 2 + oFile.getShortAt(iOffset+2, true);
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} else if (iMarker == 225) {
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// 0xE1 = Application-specific 1 (for EXIF)
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if (bDebug) console.log("Found 0xFFE1 marker");
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return readEXIFData(oFile, iOffset + 4, oFile.getShortAt(iOffset+2, true)-2);
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} else {
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iOffset += 2 + oFile.getShortAt(iOffset+2, true);
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}
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}
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}
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function readTags(oFile, iTIFFStart, iDirStart, oStrings, bBigEnd)
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{
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var iEntries = oFile.getShortAt(iDirStart, bBigEnd);
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var oTags = {};
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for (var i=0;i<iEntries;i++) {
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var iEntryOffset = iDirStart + i*12 + 2;
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var strTag = oStrings[oFile.getShortAt(iEntryOffset, bBigEnd)];
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if (!strTag && bDebug) console.log("Unknown tag: " + oFile.getShortAt(iEntryOffset, bBigEnd));
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oTags[strTag] = readTagValue(oFile, iEntryOffset, iTIFFStart, iDirStart, bBigEnd);
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}
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return oTags;
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}
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function readTagValue(oFile, iEntryOffset, iTIFFStart, iDirStart, bBigEnd)
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{
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var iType = oFile.getShortAt(iEntryOffset+2, bBigEnd);
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var iNumValues = oFile.getLongAt(iEntryOffset+4, bBigEnd);
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var iValueOffset = oFile.getLongAt(iEntryOffset+8, bBigEnd) + iTIFFStart;
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switch (iType) {
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case 1: // byte, 8-bit unsigned int
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case 7: // undefined, 8-bit byte, value depending on field
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if (iNumValues == 1) {
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return oFile.getByteAt(iEntryOffset + 8, bBigEnd);
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} else {
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var iValOffset = iNumValues > 4 ? iValueOffset : (iEntryOffset + 8);
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var aVals = [];
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for (var n=0;n<iNumValues;n++) {
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aVals[n] = oFile.getByteAt(iValOffset + n);
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}
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return aVals;
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}
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break;
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case 2: // ascii, 8-bit byte
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var iStringOffset = iNumValues > 4 ? iValueOffset : (iEntryOffset + 8);
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return oFile.getStringAt(iStringOffset, iNumValues-1);
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break;
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case 3: // short, 16 bit int
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if (iNumValues == 1) {
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return oFile.getShortAt(iEntryOffset + 8, bBigEnd);
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} else {
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var iValOffset = iNumValues > 2 ? iValueOffset : (iEntryOffset + 8);
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var aVals = [];
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for (var n=0;n<iNumValues;n++) {
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aVals[n] = oFile.getShortAt(iValOffset + 2*n, bBigEnd);
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}
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return aVals;
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}
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break;
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case 4: // long, 32 bit int
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if (iNumValues == 1) {
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return oFile.getLongAt(iEntryOffset + 8, bBigEnd);
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} else {
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var aVals = [];
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for (var n=0;n<iNumValues;n++) {
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aVals[n] = oFile.getLongAt(iValueOffset + 4*n, bBigEnd);
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}
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return aVals;
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}
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break;
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case 5: // rational = two long values, first is numerator, second is denominator
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if (iNumValues == 1) {
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return oFile.getLongAt(iValueOffset, bBigEnd) / oFile.getLongAt(iValueOffset+4, bBigEnd);
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} else {
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var aVals = [];
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for (var n=0;n<iNumValues;n++) {
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aVals[n] = oFile.getLongAt(iValueOffset + 8*n, bBigEnd) / oFile.getLongAt(iValueOffset+4 + 8*n, bBigEnd);
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}
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return aVals;
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}
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break;
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case 9: // slong, 32 bit signed int
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if (iNumValues == 1) {
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return oFile.getSLongAt(iEntryOffset + 8, bBigEnd);
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} else {
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var aVals = [];
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for (var n=0;n<iNumValues;n++) {
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aVals[n] = oFile.getSLongAt(iValueOffset + 4*n, bBigEnd);
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}
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return aVals;
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}
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break;
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case 10: // signed rational, two slongs, first is numerator, second is denominator
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if (iNumValues == 1) {
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return oFile.getSLongAt(iValueOffset, bBigEnd) / oFile.getSLongAt(iValueOffset+4, bBigEnd);
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} else {
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var aVals = [];
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for (var n=0;n<iNumValues;n++) {
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aVals[n] = oFile.getSLongAt(iValueOffset + 8*n, bBigEnd) / oFile.getSLongAt(iValueOffset+4 + 8*n, bBigEnd);
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}
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return aVals;
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}
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break;
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}
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}
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function readEXIFData(oFile, iStart, iLength)
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{
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if (oFile.getStringAt(iStart, 4) != "Exif") {
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if (bDebug) console.log("Not valid EXIF data! " + oFile.getStringAt(iStart, 4));
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return false;
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}
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var bBigEnd;
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var iTIFFOffset = iStart + 6;
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// test for TIFF validity and endianness
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|
if (oFile.getShortAt(iTIFFOffset) == 0x4949) {
|
|
bBigEnd = false;
|
|
} else if (oFile.getShortAt(iTIFFOffset) == 0x4D4D) {
|
|
bBigEnd = true;
|
|
} else {
|
|
if (bDebug) console.log("Not valid TIFF data! (no 0x4949 or 0x4D4D)");
|
|
return false;
|
|
}
|
|
|
|
if (oFile.getShortAt(iTIFFOffset+2, bBigEnd) != 0x002A) {
|
|
if (bDebug) console.log("Not valid TIFF data! (no 0x002A)");
|
|
return false;
|
|
}
|
|
|
|
if (oFile.getLongAt(iTIFFOffset+4, bBigEnd) != 0x00000008) {
|
|
if (bDebug) console.log("Not valid TIFF data! (First offset not 8)", oFile.getShortAt(iTIFFOffset+4, bBigEnd));
|
|
return false;
|
|
}
|
|
|
|
var oTags = readTags(oFile, iTIFFOffset, iTIFFOffset+8, EXIF.TiffTags, bBigEnd);
|
|
|
|
if (oTags.ExifIFDPointer) {
|
|
var oEXIFTags = readTags(oFile, iTIFFOffset, iTIFFOffset + oTags.ExifIFDPointer, EXIF.Tags, bBigEnd);
|
|
for (var strTag in oEXIFTags) {
|
|
switch (strTag) {
|
|
case "LightSource" :
|
|
case "Flash" :
|
|
case "MeteringMode" :
|
|
case "ExposureProgram" :
|
|
case "SensingMethod" :
|
|
case "SceneCaptureType" :
|
|
case "SceneType" :
|
|
case "CustomRendered" :
|
|
case "WhiteBalance" :
|
|
case "GainControl" :
|
|
case "Contrast" :
|
|
case "Saturation" :
|
|
case "Sharpness" :
|
|
case "SubjectDistanceRange" :
|
|
case "FileSource" :
|
|
oEXIFTags[strTag] = EXIF.StringValues[strTag][oEXIFTags[strTag]];
|
|
break;
|
|
|
|
case "ExifVersion" :
|
|
case "FlashpixVersion" :
|
|
oEXIFTags[strTag] = String.fromCharCode(oEXIFTags[strTag][0], oEXIFTags[strTag][1], oEXIFTags[strTag][2], oEXIFTags[strTag][3]);
|
|
break;
|
|
|
|
case "ComponentsConfiguration" :
|
|
oEXIFTags[strTag] =
|
|
EXIF.StringValues.Components[oEXIFTags[strTag][0]]
|
|
+ EXIF.StringValues.Components[oEXIFTags[strTag][1]]
|
|
+ EXIF.StringValues.Components[oEXIFTags[strTag][2]]
|
|
+ EXIF.StringValues.Components[oEXIFTags[strTag][3]];
|
|
break;
|
|
}
|
|
oTags[strTag] = oEXIFTags[strTag];
|
|
}
|
|
}
|
|
|
|
if (oTags.GPSInfoIFDPointer) {
|
|
var oGPSTags = readTags(oFile, iTIFFOffset, iTIFFOffset + oTags.GPSInfoIFDPointer, EXIF.GPSTags, bBigEnd);
|
|
for (var strTag in oGPSTags) {
|
|
switch (strTag) {
|
|
case "GPSVersionID" :
|
|
oGPSTags[strTag] = oGPSTags[strTag][0]
|
|
+ "." + oGPSTags[strTag][1]
|
|
+ "." + oGPSTags[strTag][2]
|
|
+ "." + oGPSTags[strTag][3];
|
|
break;
|
|
}
|
|
oTags[strTag] = oGPSTags[strTag];
|
|
}
|
|
}
|
|
|
|
return oTags;
|
|
}
|
|
|
|
|
|
EXIF.getData = function(oImg, fncCallback)
|
|
{
|
|
if (!oImg.complete) return false;
|
|
if (!imageHasData(oImg)) {
|
|
getImageData(oImg, fncCallback);
|
|
} else {
|
|
if (fncCallback) fncCallback();
|
|
}
|
|
return true;
|
|
}
|
|
|
|
EXIF.getTag = function(oImg, strTag)
|
|
{
|
|
if (!imageHasData(oImg)) return;
|
|
return oImg.exifdata[strTag];
|
|
}
|
|
|
|
EXIF.getAllTags = function(oImg)
|
|
{
|
|
if (!imageHasData(oImg)) return {};
|
|
var oData = oImg.exifdata;
|
|
var oAllTags = {};
|
|
for (var a in oData) {
|
|
if (oData.hasOwnProperty(a)) {
|
|
oAllTags[a] = oData[a];
|
|
}
|
|
}
|
|
return oAllTags;
|
|
}
|
|
|
|
|
|
EXIF.pretty = function(oImg)
|
|
{
|
|
if (!imageHasData(oImg)) return "";
|
|
var oData = oImg.exifdata;
|
|
var strPretty = "";
|
|
for (var a in oData) {
|
|
if (oData.hasOwnProperty(a)) {
|
|
if (typeof oData[a] == "object") {
|
|
strPretty += a + " : [" + oData[a].length + " values]\r\n";
|
|
} else {
|
|
strPretty += a + " : " + oData[a] + "\r\n";
|
|
}
|
|
}
|
|
}
|
|
return strPretty;
|
|
}
|
|
|
|
EXIF.readFromBinaryFile = function(oFile) {
|
|
return findEXIFinJPEG(oFile);
|
|
}
|
|
|
|
function loadAllImages()
|
|
{
|
|
var aImages = document.getElementsByTagName("img");
|
|
for (var i=0;i<aImages.length;i++) {
|
|
if (aImages[i].getAttribute("exif") == "true") {
|
|
if (!aImages[i].complete) {
|
|
addEvent(aImages[i], "load",
|
|
function() {
|
|
EXIF.getData(this);
|
|
}
|
|
);
|
|
} else {
|
|
EXIF.getData(aImages[i]);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
addEvent(window, "load", loadAllImages);
|
|
|
|
})();
|
|
|