1 | /*
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2 | * Copyright 2002-2015 Drew Noakes
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3 | *
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4 | * Licensed under the Apache License, Version 2.0 (the "License");
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5 | * you may not use this file except in compliance with the License.
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6 | * You may obtain a copy of the License at
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7 | *
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8 | * http://www.apache.org/licenses/LICENSE-2.0
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9 | *
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10 | * Unless required by applicable law or agreed to in writing, software
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11 | * distributed under the License is distributed on an "AS IS" BASIS,
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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13 | * See the License for the specific language governing permissions and
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14 | * limitations under the License.
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15 | *
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16 | * More information about this project is available at:
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17 | *
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18 | * https://drewnoakes.com/code/exif/
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19 | * https://github.com/drewnoakes/metadata-extractor
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20 | */
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21 |
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22 | package com.drew.metadata.exif;
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23 |
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24 | import com.drew.lang.Rational;
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25 | import com.drew.lang.annotations.NotNull;
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26 | import com.drew.lang.annotations.Nullable;
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27 | import com.drew.metadata.TagDescriptor;
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28 |
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29 | import java.io.UnsupportedEncodingException;
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30 |
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31 | import static com.drew.metadata.exif.ExifIFD0Directory.*;
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32 |
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33 | /**
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34 | * Provides human-readable string representations of tag values stored in a {@link ExifIFD0Directory}.
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35 | *
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36 | * @author Drew Noakes https://drewnoakes.com
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37 | */
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38 | public class ExifIFD0Descriptor extends TagDescriptor<ExifIFD0Directory>
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39 | {
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40 | /**
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41 | * Dictates whether rational values will be represented in decimal format in instances
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42 | * where decimal notation is elegant (such as 1/2 -> 0.5, but not 1/3).
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43 | */
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44 | private final boolean _allowDecimalRepresentationOfRationals = true;
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45 |
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46 | public ExifIFD0Descriptor(@NotNull ExifIFD0Directory directory)
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47 | {
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48 | super(directory);
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49 | }
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50 |
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51 | // Note for the potential addition of brightness presentation in eV:
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52 | // Brightness of taken subject. To calculate Exposure(Ev) from BrightnessValue(Bv),
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53 | // you must add SensitivityValue(Sv).
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54 | // Ev=BV+Sv Sv=log2(ISOSpeedRating/3.125)
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55 | // ISO100:Sv=5, ISO200:Sv=6, ISO400:Sv=7, ISO125:Sv=5.32.
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56 |
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57 | /**
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58 | * Returns a descriptive value of the specified tag for this image.
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59 | * Where possible, known values will be substituted here in place of the raw
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60 | * tokens actually kept in the Exif segment. If no substitution is
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61 | * available, the value provided by getString(int) will be returned.
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62 | * @param tagType the tag to find a description for
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63 | * @return a description of the image's value for the specified tag, or
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64 | * <code>null</code> if the tag hasn't been defined.
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65 | */
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66 | @Override
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67 | @Nullable
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68 | public String getDescription(int tagType)
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69 | {
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70 | switch (tagType) {
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71 | case TAG_RESOLUTION_UNIT:
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72 | return getResolutionDescription();
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73 | case TAG_YCBCR_POSITIONING:
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74 | return getYCbCrPositioningDescription();
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75 | case TAG_X_RESOLUTION:
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76 | return getXResolutionDescription();
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77 | case TAG_Y_RESOLUTION:
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78 | return getYResolutionDescription();
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79 | case TAG_REFERENCE_BLACK_WHITE:
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80 | return getReferenceBlackWhiteDescription();
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81 | case TAG_ORIENTATION:
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82 | return getOrientationDescription();
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83 |
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84 | case TAG_WIN_AUTHOR:
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85 | return getWindowsAuthorDescription();
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86 | case TAG_WIN_COMMENT:
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87 | return getWindowsCommentDescription();
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88 | case TAG_WIN_KEYWORDS:
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89 | return getWindowsKeywordsDescription();
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90 | case TAG_WIN_SUBJECT:
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91 | return getWindowsSubjectDescription();
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92 | case TAG_WIN_TITLE:
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93 | return getWindowsTitleDescription();
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94 |
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95 | default:
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96 | return super.getDescription(tagType);
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97 | }
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98 | }
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99 |
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100 | @Nullable
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101 | public String getReferenceBlackWhiteDescription()
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102 | {
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103 | int[] ints = _directory.getIntArray(TAG_REFERENCE_BLACK_WHITE);
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104 | if (ints==null || ints.length < 6)
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105 | return null;
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106 | int blackR = ints[0];
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107 | int whiteR = ints[1];
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108 | int blackG = ints[2];
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109 | int whiteG = ints[3];
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110 | int blackB = ints[4];
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111 | int whiteB = ints[5];
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112 | return String.format("[%d,%d,%d] [%d,%d,%d]", blackR, blackG, blackB, whiteR, whiteG, whiteB);
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113 | }
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114 |
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115 | @Nullable
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116 | public String getYResolutionDescription()
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117 | {
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118 | Rational value = _directory.getRational(TAG_Y_RESOLUTION);
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119 | if (value==null)
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120 | return null;
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121 | final String unit = getResolutionDescription();
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122 | return String.format("%s dots per %s",
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123 | value.toSimpleString(_allowDecimalRepresentationOfRationals),
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124 | unit == null ? "unit" : unit.toLowerCase());
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125 | }
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126 |
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127 | @Nullable
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128 | public String getXResolutionDescription()
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129 | {
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130 | Rational value = _directory.getRational(TAG_X_RESOLUTION);
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131 | if (value==null)
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132 | return null;
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133 | final String unit = getResolutionDescription();
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134 | return String.format("%s dots per %s",
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135 | value.toSimpleString(_allowDecimalRepresentationOfRationals),
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136 | unit == null ? "unit" : unit.toLowerCase());
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137 | }
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138 |
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139 | @Nullable
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140 | public String getYCbCrPositioningDescription()
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141 | {
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142 | return getIndexedDescription(TAG_YCBCR_POSITIONING, 1, "Center of pixel array", "Datum point");
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143 | }
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144 |
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145 | @Nullable
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146 | public String getOrientationDescription()
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147 | {
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148 | return getIndexedDescription(TAG_ORIENTATION, 1,
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149 | "Top, left side (Horizontal / normal)",
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150 | "Top, right side (Mirror horizontal)",
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151 | "Bottom, right side (Rotate 180)",
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152 | "Bottom, left side (Mirror vertical)",
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153 | "Left side, top (Mirror horizontal and rotate 270 CW)",
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154 | "Right side, top (Rotate 90 CW)",
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155 | "Right side, bottom (Mirror horizontal and rotate 90 CW)",
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156 | "Left side, bottom (Rotate 270 CW)");
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157 | }
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158 |
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159 | @Nullable
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160 | public String getResolutionDescription()
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161 | {
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162 | // '1' means no-unit, '2' means inch, '3' means centimeter. Default value is '2'(inch)
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163 | return getIndexedDescription(TAG_RESOLUTION_UNIT, 1, "(No unit)", "Inch", "cm");
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164 | }
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165 |
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166 | /** The Windows specific tags uses plain Unicode. */
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167 | @Nullable
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168 | private String getUnicodeDescription(int tag)
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169 | {
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170 | byte[] bytes = _directory.getByteArray(tag);
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171 | if (bytes == null)
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172 | return null;
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173 | try {
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174 | // Decode the unicode string and trim the unicode zero "\0" from the end.
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175 | return new String(bytes, "UTF-16LE").trim();
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176 | } catch (UnsupportedEncodingException ex) {
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177 | return null;
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178 | }
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179 | }
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180 |
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181 | @Nullable
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182 | public String getWindowsAuthorDescription()
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183 | {
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184 | return getUnicodeDescription(TAG_WIN_AUTHOR);
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185 | }
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186 |
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187 | @Nullable
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188 | public String getWindowsCommentDescription()
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189 | {
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190 | return getUnicodeDescription(TAG_WIN_COMMENT);
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191 | }
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192 |
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193 | @Nullable
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194 | public String getWindowsKeywordsDescription()
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195 | {
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196 | return getUnicodeDescription(TAG_WIN_KEYWORDS);
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197 | }
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198 |
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199 | @Nullable
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200 | public String getWindowsTitleDescription()
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201 | {
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202 | return getUnicodeDescription(TAG_WIN_TITLE);
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203 | }
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204 |
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205 | @Nullable
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206 | public String getWindowsSubjectDescription()
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207 | {
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208 | return getUnicodeDescription(TAG_WIN_SUBJECT);
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209 | }
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210 | }
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