1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.tools;
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3 |
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4 | import java.io.File;
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5 | import java.io.IOException;
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6 | import java.text.ParseException;
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7 | import java.util.Date;
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8 |
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9 | import org.openstreetmap.josm.Main;
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10 | import org.openstreetmap.josm.data.coor.LatLon;
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11 | import org.openstreetmap.josm.tools.date.PrimaryDateParser;
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12 |
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13 | import com.drew.imaging.jpeg.JpegMetadataReader;
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14 | import com.drew.imaging.jpeg.JpegProcessingException;
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15 | import com.drew.lang.Rational;
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16 | import com.drew.metadata.Directory;
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17 | import com.drew.metadata.Metadata;
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18 | import com.drew.metadata.MetadataException;
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19 | import com.drew.metadata.Tag;
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20 | import com.drew.metadata.exif.ExifIFD0Directory;
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21 | import com.drew.metadata.exif.ExifSubIFDDirectory;
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22 | import com.drew.metadata.exif.GpsDirectory;
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23 |
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24 | /**
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25 | * Read out EXIF information from a JPEG file
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26 | * @author Imi
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27 | * @since 99
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28 | */
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29 | public final class ExifReader {
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30 |
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31 | private ExifReader() {
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32 | // Hide default constructor for utils classes
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33 | }
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34 |
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35 | /**
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36 | * Returns the date/time from the given JPEG file.
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37 | * @param filename The JPEG file to read
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38 | * @return The date/time read in the EXIF section, or {@code null} if not found
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39 | * @throws ParseException if {@link PrimaryDateParser#parse} fails to parse date/time
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40 | */
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41 | public static Date readTime(File filename) throws ParseException {
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42 | try {
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43 | Metadata metadata = JpegMetadataReader.readMetadata(filename);
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44 | String dateStr = null;
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45 | OUTER:
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46 | for (Directory dirIt : metadata.getDirectories()) {
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47 | for (Tag tag : dirIt.getTags()) {
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48 | if (tag.getTagType() == ExifSubIFDDirectory.TAG_DATETIME_ORIGINAL /* 0x9003 */) {
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49 | dateStr = tag.getDescription();
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50 | break OUTER; // prefer this tag
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51 | }
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52 | if (tag.getTagType() == ExifIFD0Directory.TAG_DATETIME /* 0x0132 */ ||
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53 | tag.getTagType() == ExifSubIFDDirectory.TAG_DATETIME_DIGITIZED /* 0x9004 */) {
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54 | dateStr = tag.getDescription();
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55 | }
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56 | }
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57 | }
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58 | if (dateStr != null) {
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59 | dateStr = dateStr.replace('/', ':'); // workaround for HTC Sensation bug, see #7228
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60 | return new PrimaryDateParser().parse(dateStr);
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61 | }
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62 | } catch (ParseException e) {
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63 | throw e;
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64 | } catch (Exception e) {
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65 | Main.error(e);
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66 | }
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67 | return null;
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68 | }
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69 |
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70 | /**
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71 | * Returns the image orientation of the given JPEG file.
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72 | * @param filename The JPEG file to read
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73 | * @return The image orientation as an {@code int}. Default value is 1. Possible values are listed in EXIF spec as follows:<br><ol>
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74 | * <li>The 0th row is at the visual top of the image, and the 0th column is the visual left-hand side.</li>
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75 | * <li>The 0th row is at the visual top of the image, and the 0th column is the visual right-hand side.</li>
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76 | * <li>The 0th row is at the visual bottom of the image, and the 0th column is the visual right-hand side.</li>
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77 | * <li>The 0th row is at the visual bottom of the image, and the 0th column is the visual left-hand side.</li>
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78 | * <li>The 0th row is the visual left-hand side of the image, and the 0th column is the visual top.</li>
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79 | * <li>The 0th row is the visual right-hand side of the image, and the 0th column is the visual top.</li>
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80 | * <li>The 0th row is the visual right-hand side of the image, and the 0th column is the visual bottom.</li>
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81 | * <li>The 0th row is the visual left-hand side of the image, and the 0th column is the visual bottom.</li></ol>
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82 | * @see <a href="http://www.impulseadventure.com/photo/exif-orientation.html">http://www.impulseadventure.com/photo/exif-orientation.html</a>
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83 | * @see <a href="http://www.daveperrett.com/articles/2012/07/28/exif-orientation-handling-is-a-ghetto">http://www.daveperrett.com/articles/2012/07/28/exif-orientation-handling-is-a-ghetto</a>
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84 | */
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85 | public static Integer readOrientation(File filename) {
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86 | try {
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87 | final Metadata metadata = JpegMetadataReader.readMetadata(filename);
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88 | final Directory dir = metadata.getDirectory(ExifIFD0Directory.class);
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89 | return dir.getInt(ExifIFD0Directory.TAG_ORIENTATION);
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90 | } catch (JpegProcessingException | MetadataException | IOException e) {
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91 | Main.error(e);
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92 | }
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93 | return null;
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94 | }
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95 |
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96 | /**
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97 | * Returns the geolocation of the given JPEG file.
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98 | * @param filename The JPEG file to read
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99 | * @return The lat/lon read in the EXIF section, or {@code null} if not found
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100 | * @since 6209
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101 | */
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102 | public static LatLon readLatLon(File filename) {
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103 | try {
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104 | final Metadata metadata = JpegMetadataReader.readMetadata(filename);
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105 | final GpsDirectory dirGps = metadata.getDirectory(GpsDirectory.class);
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106 | return readLatLon(dirGps);
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107 | } catch (JpegProcessingException e) {
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108 | Main.error(e);
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109 | } catch (IOException e) {
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110 | Main.error(e);
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111 | } catch (MetadataException e) {
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112 | Main.error(e);
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113 | }
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114 | return null;
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115 | }
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116 |
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117 | /**
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118 | * Returns the geolocation of the given EXIF GPS directory.
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119 | * @param dirGps The EXIF GPS directory
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120 | * @return The lat/lon read in the EXIF section, or {@code null} if {@code dirGps} is null
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121 | * @throws MetadataException
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122 | * @since 6209
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123 | */
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124 | public static LatLon readLatLon(GpsDirectory dirGps) throws MetadataException {
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125 | if (dirGps != null) {
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126 | double lat = readAxis(dirGps, GpsDirectory.TAG_GPS_LATITUDE, GpsDirectory.TAG_GPS_LATITUDE_REF, 'S');
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127 | double lon = readAxis(dirGps, GpsDirectory.TAG_GPS_LONGITUDE, GpsDirectory.TAG_GPS_LONGITUDE_REF, 'W');
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128 | return new LatLon(lat, lon);
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129 | }
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130 | return null;
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131 | }
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132 |
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133 | /**
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134 | * Returns the direction of the given JPEG file.
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135 | * @param filename The JPEG file to read
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136 | * @return The direction of the image when it was captures (in degrees between 0.0 and 359.99), or {@code null} if missing or if {@code dirGps} is null
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137 | * @since 6209
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138 | */
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139 | public static Double readDirection(File filename) {
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140 | try {
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141 | final Metadata metadata = JpegMetadataReader.readMetadata(filename);
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142 | final GpsDirectory dirGps = metadata.getDirectory(GpsDirectory.class);
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143 | return readDirection(dirGps);
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144 | } catch (JpegProcessingException e) {
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145 | Main.error(e);
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146 | } catch (IOException e) {
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147 | Main.error(e);
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148 | }
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149 | return null;
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150 | }
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151 |
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152 | /**
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153 | * Returns the direction of the given EXIF GPS directory.
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154 | * @param dirGps The EXIF GPS directory
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155 | * @return The direction of the image when it was captures (in degrees between 0.0 and 359.99), or {@code null} if missing or if {@code dirGps} is null
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156 | * @since 6209
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157 | */
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158 | public static Double readDirection(GpsDirectory dirGps) {
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159 | if (dirGps != null) {
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160 | Rational direction = dirGps.getRational(GpsDirectory.TAG_GPS_IMG_DIRECTION);
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161 | if (direction != null) {
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162 | return direction.doubleValue();
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163 | }
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164 | }
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165 | return null;
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166 | }
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167 |
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168 | private static double readAxis(GpsDirectory dirGps, int gpsTag, int gpsTagRef, char cRef) throws MetadataException {
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169 | double value;
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170 | Rational[] components = dirGps.getRationalArray(gpsTag);
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171 | if (components != null) {
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172 | double deg = components[0].doubleValue();
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173 | double min = components[1].doubleValue();
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174 | double sec = components[2].doubleValue();
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175 |
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176 | if (Double.isNaN(deg) && Double.isNaN(min) && Double.isNaN(sec))
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177 | throw new IllegalArgumentException();
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178 |
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179 | value = (Double.isNaN(deg) ? 0 : deg + (Double.isNaN(min) ? 0 : (min / 60)) + (Double.isNaN(sec) ? 0 : (sec / 3600)));
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180 |
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181 | if (dirGps.getString(gpsTagRef).charAt(0) == cRef) {
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182 | value = -value;
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183 | }
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184 | } else {
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185 | // Try to read lon/lat as double value (Nonstandard, created by some cameras -> #5220)
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186 | value = dirGps.getDouble(gpsTag);
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187 | }
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188 | return value;
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189 | }
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190 | }
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