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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.gallery3d.data;
     18 
     19 import android.media.ExifInterface;
     20 
     21 import com.android.gallery3d.R;
     22 import com.android.gallery3d.common.ExifTags;
     23 
     24 import java.io.IOException;
     25 import java.util.HashMap;
     26 import java.util.Iterator;
     27 import java.util.Map.Entry;
     28 import java.util.TreeMap;
     29 
     30 public class MediaDetails implements Iterable<Entry<Integer, Object>> {
     31     @SuppressWarnings("unused")
     32     private static final String TAG = "MediaDetails";
     33 
     34     private TreeMap<Integer, Object> mDetails = new TreeMap<Integer, Object>();
     35     private HashMap<Integer, Integer> mUnits = new HashMap<Integer, Integer>();
     36 
     37     public static final int INDEX_TITLE = 1;
     38     public static final int INDEX_DESCRIPTION = 2;
     39     public static final int INDEX_DATETIME = 3;
     40     public static final int INDEX_LOCATION = 4;
     41     public static final int INDEX_WIDTH = 5;
     42     public static final int INDEX_HEIGHT = 6;
     43     public static final int INDEX_ORIENTATION = 7;
     44     public static final int INDEX_DURATION = 8;
     45     public static final int INDEX_MIMETYPE = 9;
     46     public static final int INDEX_SIZE = 10;
     47 
     48     // for EXIF
     49     public static final int INDEX_MAKE = 100;
     50     public static final int INDEX_MODEL = 101;
     51     public static final int INDEX_FLASH = 102;
     52     public static final int INDEX_FOCAL_LENGTH = 103;
     53     public static final int INDEX_WHITE_BALANCE = 104;
     54     public static final int INDEX_APERTURE = 105;
     55     public static final int INDEX_SHUTTER_SPEED = 106;
     56     public static final int INDEX_EXPOSURE_TIME = 107;
     57     public static final int INDEX_ISO = 108;
     58 
     59     // Put this last because it may be long.
     60     public static final int INDEX_PATH = 200;
     61 
     62     public static class FlashState {
     63         private static int FLASH_FIRED_MASK = 1;
     64         private static int FLASH_RETURN_MASK = 2 | 4;
     65         private static int FLASH_MODE_MASK = 8 | 16;
     66         private static int FLASH_FUNCTION_MASK = 32;
     67         private static int FLASH_RED_EYE_MASK = 64;
     68         private int mState;
     69 
     70         public FlashState(int state) {
     71             mState = state;
     72         }
     73 
     74         public boolean isFlashFired() {
     75             return (mState & FLASH_FIRED_MASK) != 0;
     76         }
     77     }
     78 
     79     public void addDetail(int index, Object value) {
     80         mDetails.put(index, value);
     81     }
     82 
     83     public Object getDetail(int index) {
     84         return mDetails.get(index);
     85     }
     86 
     87     public int size() {
     88         return mDetails.size();
     89     }
     90 
     91     @Override
     92     public Iterator<Entry<Integer, Object>> iterator() {
     93         return mDetails.entrySet().iterator();
     94     }
     95 
     96     public void setUnit(int index, int unit) {
     97         mUnits.put(index, unit);
     98     }
     99 
    100     public boolean hasUnit(int index) {
    101         return mUnits.containsKey(index);
    102     }
    103 
    104     public int getUnit(int index) {
    105         return mUnits.get(index);
    106     }
    107 
    108     private static void setExifData(MediaDetails details, ExifInterface exif, String tag,
    109             int key) {
    110         String value = exif.getAttribute(tag);
    111         if (value != null) {
    112             if (key == MediaDetails.INDEX_FLASH) {
    113                 MediaDetails.FlashState state = new MediaDetails.FlashState(
    114                         Integer.valueOf(value.toString()));
    115                 details.addDetail(key, state);
    116             } else {
    117                 details.addDetail(key, value);
    118             }
    119         }
    120     }
    121 
    122     public static void extractExifInfo(MediaDetails details, String filePath) {
    123         try {
    124             ExifInterface exif = new ExifInterface(filePath);
    125             setExifData(details, exif, ExifInterface.TAG_FLASH, MediaDetails.INDEX_FLASH);
    126             setExifData(details, exif, ExifInterface.TAG_IMAGE_WIDTH, MediaDetails.INDEX_WIDTH);
    127             setExifData(details, exif, ExifInterface.TAG_IMAGE_LENGTH,
    128                     MediaDetails.INDEX_HEIGHT);
    129             setExifData(details, exif, ExifInterface.TAG_MAKE, MediaDetails.INDEX_MAKE);
    130             setExifData(details, exif, ExifInterface.TAG_MODEL, MediaDetails.INDEX_MODEL);
    131             setExifData(details, exif, ExifTags.TAG_APERTURE, MediaDetails.INDEX_APERTURE);
    132             setExifData(details, exif, ExifTags.TAG_ISO, MediaDetails.INDEX_ISO);
    133             setExifData(details, exif, ExifInterface.TAG_WHITE_BALANCE,
    134                     MediaDetails.INDEX_WHITE_BALANCE);
    135             setExifData(details, exif, ExifTags.TAG_EXPOSURE_TIME,
    136                     MediaDetails.INDEX_EXPOSURE_TIME);
    137 
    138             double data = exif.getAttributeDouble(ExifInterface.TAG_FOCAL_LENGTH, 0);
    139             if (data != 0f) {
    140                 details.addDetail(MediaDetails.INDEX_FOCAL_LENGTH, data);
    141                 details.setUnit(MediaDetails.INDEX_FOCAL_LENGTH, R.string.unit_mm);
    142             }
    143         } catch (IOException ex) {
    144             // ignore it.
    145             Log.w(TAG, "", ex);
    146         }
    147     }
    148 }
    149