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authorEarl Ou <shunhsingou@google.com>2012-11-07 17:56:11 +0800
committerEarl Ou <shunhsingou@google.com>2012-11-07 18:40:55 +0800
commit670baca6f198f931be76f248b3ddcac7e2211ad4 (patch)
tree399288b15589a71cc054c53ad0e7e5815031d1ae /gallerycommon/src
parent64bf9ee95443c1d14455cbdb05c392b3967e4756 (diff)
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Convenient function to add timestamp related exif tags
Change-Id: I8a20c38d5fd35517d0520b29aac362eff32cbdd9
Diffstat (limited to 'gallerycommon/src')
-rw-r--r--gallerycommon/src/com/android/gallery3d/exif/ExifData.java55
1 files changed, 53 insertions, 2 deletions
diff --git a/gallerycommon/src/com/android/gallery3d/exif/ExifData.java b/gallerycommon/src/com/android/gallery3d/exif/ExifData.java
index 96ccb5b..6e5c227 100644
--- a/gallerycommon/src/com/android/gallery3d/exif/ExifData.java
+++ b/gallerycommon/src/com/android/gallery3d/exif/ExifData.java
@@ -17,8 +17,12 @@
package com.android.gallery3d.exif;
import java.nio.ByteOrder;
+import java.text.DateFormat;
+import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
+import java.util.Calendar;
+import java.util.TimeZone;
/**
* This class stores the EXIF header in IFDs according to the JPEG specification.
@@ -27,6 +31,17 @@ import java.util.Arrays;
* @see IfdData
*/
public class ExifData {
+
+ private static final String GPS_DATE_FORMAT_STR = "yyyy:MM:dd";
+ private static final String DATETIME_FORMAT_STR = "yyyy:MM:dd kk:mm:ss";
+
+ private final DateFormat mDateTimeStampFormat =
+ new SimpleDateFormat(DATETIME_FORMAT_STR);
+ private final DateFormat mGPSDateStampFormat =
+ new SimpleDateFormat(GPS_DATE_FORMAT_STR);
+ private final Calendar mGPSTimeStampCalendar = Calendar.getInstance(
+ TimeZone.getTimeZone("UTC"));
+
private final IfdData[] mIfdDatas = new IfdData[IfdId.TYPE_IFD_COUNT];
private byte[] mThumbnail;
private ArrayList<byte[]> mStripBytes = new ArrayList<byte[]>();
@@ -34,6 +49,7 @@ public class ExifData {
public ExifData(ByteOrder order) {
mByteOrder = order;
+ mGPSDateStampFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
}
IfdData getIfdData(int ifdId) {
@@ -137,8 +153,9 @@ public class ExifData {
}
/**
- * Adds {@link ExifTag#TAG_GPS_LATITUDE}, {@link ExifTag#TAG_GPS_LONGITUDE},
- * {@link ExifTag#TAG_GPS_LATITUDE_REF} and {@link ExifTag#TAG_GPS_LONGITUDE_REF} with the
+ * A convenient method to adds tags {@link ExifTag#TAG_GPS_LATITUDE},
+ * {@link ExifTag#TAG_GPS_LONGITUDE}, {@link ExifTag#TAG_GPS_LATITUDE_REF} and
+ * {@link ExifTag#TAG_GPS_LONGITUDE_REF} at once with the
* given latitude and longitude.
*/
public void addGpsTags(double latitude, double longitude) {
@@ -169,6 +186,40 @@ public class ExifData {
gpsIfd.setTag(longRefTag);
}
+ /**
+ * A convenient method to add date or time related tags (
+ * {@link ExifTag#TAG_DATE_TIME_DIGITIZED}, {@link ExifTag#TAG_DATE_TIME_ORIGINAL},
+ * and {@link ExifTag#TAG_DATE_TIME}) with the given time stamp value.
+ *
+ */
+ public void addDateTimeStampTag(short tagId, long timestamp, TimeZone timezone) {
+ if (tagId == ExifTag.TAG_DATE_TIME ||
+ tagId == ExifTag.TAG_DATE_TIME_DIGITIZED ||
+ tagId == ExifTag.TAG_DATE_TIME_ORIGINAL) {
+ mDateTimeStampFormat.setTimeZone(timezone);
+ addTag(tagId).setValue(mDateTimeStampFormat.format(timestamp));
+ } else {
+ throw new IllegalArgumentException(
+ String.format("Tag %04x is not a supported date or time stamp tag", tagId));
+ }
+ }
+
+ /**
+ * A convenient method to add both {@link ExifTag#TAG_GPS_DATE_STAMP}
+ * and {@link ExifTag#TAG_GPS_TIME_STAMP}).
+ * Note that UTC timezone will be used as specified in the EXIF standard.
+ */
+ public void addGpsDateTimeStampTag(long timestamp) {
+ addTag(ExifTag.TAG_GPS_DATE_STAMP).setValue(mGPSDateStampFormat.format(timestamp));
+
+ mGPSTimeStampCalendar.setTimeInMillis(timestamp);
+ addTag(ExifTag.TAG_GPS_TIME_STAMP).
+ setValue(new Rational[] {
+ new Rational(mGPSTimeStampCalendar.get(Calendar.HOUR_OF_DAY), 1),
+ new Rational(mGPSTimeStampCalendar.get(Calendar.MINUTE), 1),
+ new Rational(mGPSTimeStampCalendar.get(Calendar.SECOND), 1)});
+ }
+
private static Rational[] toExifLatLong(double value) {
// convert to the format dd/1 mm/1 ssss/100
value = Math.abs(value);