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.camera; 18 19 import android.util.Log; 20 21 import com.android.gallery3d.exif.ExifInvalidFormatException; 22 import com.android.gallery3d.exif.ExifParser; 23 import com.android.gallery3d.exif.ExifTag; 24 25 import java.io.ByteArrayInputStream; 26 import java.io.IOException; 27 import java.io.InputStream; 28 29 public class Exif { 30 private static final String TAG = "CameraExif"; 31 32 // Returns the degrees in clockwise. Values are 0, 90, 180, or 270. getOrientation(byte[] jpeg)33 public static int getOrientation(byte[] jpeg) { 34 if (jpeg == null) return 0; 35 36 InputStream is = new ByteArrayInputStream(jpeg); 37 38 try { 39 ExifParser parser = ExifParser.parse(is, ExifParser.OPTION_IFD_0); 40 int event = parser.next(); 41 while(event != ExifParser.EVENT_END) { 42 if (event == ExifParser.EVENT_NEW_TAG) { 43 ExifTag tag = parser.getTag(); 44 if (tag.getTagId() == ExifTag.TAG_ORIENTATION && 45 tag.hasValue()) { 46 int orient = (int) tag.getValueAt(0); 47 switch (orient) { 48 case ExifTag.Orientation.TOP_LEFT: 49 return 0; 50 case ExifTag.Orientation.BOTTOM_LEFT: 51 return 180; 52 case ExifTag.Orientation.RIGHT_TOP: 53 return 90; 54 case ExifTag.Orientation.RIGHT_BOTTOM: 55 return 270; 56 default: 57 Log.i(TAG, "Unsupported orientation"); 58 return 0; 59 } 60 } 61 } 62 event = parser.next(); 63 } 64 Log.i(TAG, "Orientation not found"); 65 return 0; 66 } catch (IOException e) { 67 Log.w(TAG, "Failed to read EXIF orientation", e); 68 return 0; 69 } catch (ExifInvalidFormatException e) { 70 Log.w(TAG, "Failed to read EXIF orientation", e); 71 return 0; 72 } 73 } 74 } 75