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.awt.geom.AffineTransform;
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5 | import java.io.File;
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6 | import java.io.IOException;
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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.DateUtils;
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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.ExifDirectoryBase;
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21 | import com.drew.metadata.exif.ExifIFD0Directory;
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22 | import com.drew.metadata.exif.ExifSubIFDDirectory;
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23 | import com.drew.metadata.exif.GpsDirectory;
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24 |
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25 | /**
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26 | * Read out EXIF information from a JPEG file
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27 | * @author Imi
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28 | * @since 99
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29 | */
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30 | public final class ExifReader {
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31 |
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32 | private ExifReader() {
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33 | // Hide default constructor for utils classes
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34 | }
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35 |
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36 | /**
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37 | * Returns the date/time from the given JPEG file.
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38 | * @param filename The JPEG file to read
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39 | * @return The date/time read in the EXIF section, or {@code null} if not found
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40 | */
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41 | public static Date readTime(File filename) {
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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 | String subSeconds = null;
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46 | for (Directory dirIt : metadata.getDirectories()) {
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47 | if (!(dirIt instanceof ExifDirectoryBase)) {
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48 | continue;
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49 | }
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50 | for (Tag tag : dirIt.getTags()) {
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51 | if (tag.getTagType() == ExifSubIFDDirectory.TAG_DATETIME_ORIGINAL /* 0x9003 */ &&
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52 | !tag.getDescription().matches("\\[[0-9]+ .+\\]")) {
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53 | dateStr = tag.getDescription();
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54 | }
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55 | if (tag.getTagType() == ExifIFD0Directory.TAG_DATETIME /* 0x0132 */ ||
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56 | tag.getTagType() == ExifSubIFDDirectory.TAG_DATETIME_DIGITIZED /* 0x9004 */) {
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57 | if (dateStr != null) {
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58 | // prefer TAG_DATETIME_ORIGINAL
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59 | dateStr = tag.getDescription();
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60 | }
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61 | }
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62 | if (tag.getTagType() == ExifIFD0Directory.TAG_SUBSECOND_TIME_ORIGINAL) {
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63 | subSeconds = tag.getDescription();
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64 | }
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65 | }
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66 | }
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67 | if (dateStr != null) {
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68 | dateStr = dateStr.replace('/', ':'); // workaround for HTC Sensation bug, see #7228
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69 | final Date date = DateUtils.fromString(dateStr);
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70 | if (subSeconds != null) {
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71 | try {
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72 | date.setTime(date.getTime() + (long) (1000L * Double.parseDouble("0." + subSeconds)));
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73 | } catch (NumberFormatException e) {
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74 | Main.warn("Failed parsing sub seconds from [{0}]", subSeconds);
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75 | Main.warn(e);
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76 | }
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77 | }
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78 | return date;
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79 | }
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80 | } catch (UncheckedParseException | JpegProcessingException | IOException e) {
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81 | Main.error(e);
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82 | }
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83 | return null;
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84 | }
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85 |
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86 | /**
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87 | * Returns the image orientation of the given JPEG file.
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88 | * @param filename The JPEG file to read
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89 | * @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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90 | * <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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91 | * <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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92 | * <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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93 | * <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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94 | * <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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95 | * <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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96 | * <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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97 | * <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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98 | * @see <a href="http://www.impulseadventure.com/photo/exif-orientation.html">http://www.impulseadventure.com/photo/exif-orientation.html</a>
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99 | * @see <a href="http://www.daveperrett.com/articles/2012/07/28/exif-orientation-handling-is-a-ghetto">
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100 | * http://www.daveperrett.com/articles/2012/07/28/exif-orientation-handling-is-a-ghetto</a>
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101 | */
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102 | public static Integer readOrientation(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 Directory dir = metadata.getFirstDirectoryOfType(ExifIFD0Directory.class);
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106 | return dir == null ? null : dir.getInteger(ExifIFD0Directory.TAG_ORIENTATION);
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107 | } catch (JpegProcessingException | IOException e) {
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108 | Main.error(e);
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109 | }
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110 | return null;
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111 | }
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112 |
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113 | /**
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114 | * Returns the geolocation of the given JPEG file.
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115 | * @param filename The JPEG file to read
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116 | * @return The lat/lon read in the EXIF section, or {@code null} if not found
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117 | * @since 6209
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118 | */
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119 | public static LatLon readLatLon(File filename) {
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120 | try {
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121 | final Metadata metadata = JpegMetadataReader.readMetadata(filename);
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122 | final GpsDirectory dirGps = metadata.getFirstDirectoryOfType(GpsDirectory.class);
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123 | return readLatLon(dirGps);
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124 | } catch (JpegProcessingException | IOException | MetadataException e) {
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125 | Main.error(e);
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126 | }
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127 | return null;
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128 | }
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129 |
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130 | /**
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131 | * Returns the geolocation of the given EXIF GPS directory.
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132 | * @param dirGps The EXIF GPS directory
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133 | * @return The lat/lon read in the EXIF section, or {@code null} if {@code dirGps} is null
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134 | * @throws MetadataException if invalid metadata is given
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135 | * @since 6209
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136 | */
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137 | public static LatLon readLatLon(GpsDirectory dirGps) throws MetadataException {
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138 | if (dirGps != null) {
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139 | double lat = readAxis(dirGps, GpsDirectory.TAG_LATITUDE, GpsDirectory.TAG_LATITUDE_REF, 'S');
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140 | double lon = readAxis(dirGps, GpsDirectory.TAG_LONGITUDE, GpsDirectory.TAG_LONGITUDE_REF, 'W');
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141 | return new LatLon(lat, lon);
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142 | }
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143 | return null;
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144 | }
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145 |
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146 | /**
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147 | * Returns the direction of the given JPEG file.
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148 | * @param filename The JPEG file to read
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149 | * @return The direction of the image when it was captures (in degrees between 0.0 and 359.99),
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150 | * or {@code null} if missing or if {@code dirGps} is null
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151 | * @since 6209
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152 | */
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153 | public static Double readDirection(File filename) {
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154 | try {
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155 | final Metadata metadata = JpegMetadataReader.readMetadata(filename);
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156 | final GpsDirectory dirGps = metadata.getFirstDirectoryOfType(GpsDirectory.class);
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157 | return readDirection(dirGps);
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158 | } catch (JpegProcessingException | IOException e) {
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159 | Main.error(e);
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160 | }
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161 | return null;
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162 | }
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163 |
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164 | /**
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165 | * Returns the direction of the given EXIF GPS directory.
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166 | * @param dirGps The EXIF GPS directory
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167 | * @return The direction of the image when it was captures (in degrees between 0.0 and 359.99),
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168 | * or {@code null} if missing or if {@code dirGps} is null
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169 | * @since 6209
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170 | */
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171 | public static Double readDirection(GpsDirectory dirGps) {
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172 | if (dirGps != null) {
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173 | Rational direction = dirGps.getRational(GpsDirectory.TAG_IMG_DIRECTION);
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174 | if (direction != null) {
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175 | return direction.doubleValue();
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176 | }
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177 | }
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178 | return null;
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179 | }
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180 |
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181 | private static double readAxis(GpsDirectory dirGps, int gpsTag, int gpsTagRef, char cRef) throws MetadataException {
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182 | double value;
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183 | Rational[] components = dirGps.getRationalArray(gpsTag);
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184 | if (components != null) {
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185 | double deg = components[0].doubleValue();
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186 | double min = components[1].doubleValue();
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187 | double sec = components[2].doubleValue();
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188 |
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189 | if (Double.isNaN(deg) && Double.isNaN(min) && Double.isNaN(sec))
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190 | throw new IllegalArgumentException("deg, min and sec are NaN");
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191 |
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192 | value = Double.isNaN(deg) ? 0 : deg + (Double.isNaN(min) ? 0 : (min / 60)) + (Double.isNaN(sec) ? 0 : (sec / 3600));
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193 |
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194 | if (dirGps.getString(gpsTagRef).charAt(0) == cRef) {
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195 | value = -value;
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196 | }
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197 | } else {
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198 | // Try to read lon/lat as double value (Nonstandard, created by some cameras -> #5220)
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199 | value = dirGps.getDouble(gpsTag);
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200 | }
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201 | return value;
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202 | }
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203 |
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204 | /**
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205 | * Returns a Transform that fixes the image orientation.
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206 | *
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207 | * Only orientation 1, 3, 6 and 8 are supported. Everything else is treated
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208 | * as 1.
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209 | * @param orientation the exif-orientation of the image
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210 | * @param width the original width of the image
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211 | * @param height the original height of the image
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212 | * @return a transform that rotates the image, so it is upright
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213 | */
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214 | public static AffineTransform getRestoreOrientationTransform(final int orientation, final int width, final int height) {
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215 | final int q;
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216 | final double ax, ay;
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217 | switch (orientation) {
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218 | case 8:
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219 | q = -1;
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220 | ax = width / 2d;
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221 | ay = width / 2d;
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222 | break;
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223 | case 3:
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224 | q = 2;
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225 | ax = width / 2d;
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226 | ay = height / 2d;
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227 | break;
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228 | case 6:
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229 | q = 1;
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230 | ax = height / 2d;
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231 | ay = height / 2d;
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232 | break;
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233 | default:
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234 | q = 0;
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235 | ax = 0;
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236 | ay = 0;
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237 | }
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238 | return AffineTransform.getQuadrantRotateInstance(q, ax, ay);
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239 | }
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240 |
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241 | /**
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242 | * Check, if the given orientation switches width and height of the image.
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243 | * E.g. 90 degree rotation
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244 | *
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245 | * Only orientation 1, 3, 6 and 8 are supported. Everything else is treated
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246 | * as 1.
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247 | * @param orientation the exif-orientation of the image
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248 | * @return true, if it switches width and height
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249 | */
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250 | public static boolean orientationSwitchesDimensions(int orientation) {
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251 | return orientation == 6 || orientation == 8;
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252 | }
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253 |
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254 | /**
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255 | * Check, if the given orientation requires any correction to the image.
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256 | *
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257 | * Only orientation 1, 3, 6 and 8 are supported. Everything else is treated
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258 | * as 1.
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259 | * @param orientation the exif-orientation of the image
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260 | * @return true, unless the orientation value is 1 or unsupported.
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261 | */
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262 | public static boolean orientationNeedsCorrection(int orientation) {
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263 | return orientation == 3 || orientation == 6 || orientation == 8;
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264 | }
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265 | }
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