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fixed exposure time format

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Thibault Deckers 2020-08-29 00:31:58 +09:00
parent f0818066b5
commit 67a5e19e23
1 changed files with 17 additions and 7 deletions
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24
android/app/src/main/java/deckers/thibault/aves/channel/calls/MetadataHandler.java
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@ -20,6 +20,7 @@ import com.adobe.internal.xmp.properties.XMPProperty;
import com.adobe.internal.xmp.properties.XMPPropertyInfo;
import com.drew.imaging.ImageMetadataReader;
import com.drew.lang.GeoLocation;
import com.drew.lang.Rational;
import com.drew.metadata.Directory;
import com.drew.metadata.Metadata;
import com.drew.metadata.Tag;
@ -374,8 +375,23 @@ public class MetadataHandler implements MethodChannel.MethodCallHandler {
Metadata metadata = ImageMetadataReader.readMetadata(is);
for (ExifSubIFDDirectory directory : metadata.getDirectoriesOfType(ExifSubIFDDirectory.class)) {
putDescriptionFromTag(metadataMap, KEY_APERTURE, directory, ExifSubIFDDirectory.TAG_FNUMBER);
putStringFromTag(metadataMap, KEY_EXPOSURE_TIME, directory, ExifSubIFDDirectory.TAG_EXPOSURE_TIME);
putDescriptionFromTag(metadataMap, KEY_FOCAL_LENGTH, directory, ExifSubIFDDirectory.TAG_FOCAL_LENGTH);
if (directory.containsTag(ExifSubIFDDirectory.TAG_EXPOSURE_TIME)) {
// TAG_EXPOSURE_TIME as a string is sometimes a ratio, sometimes a decimal
// so we explicitly request it as a rational (e.g. 1/100, 1/14, 71428571/1000000000, 4000/1000, 2000000000/500000000)
// and process it to make sure the numerator is `1` when the ratio value is less than 1
Rational rational = directory.getRational(ExifSubIFDDirectory.TAG_EXPOSURE_TIME);
long num = rational.getNumerator();
long denom = rational.getDenominator();
if (num > denom) {
metadataMap.put(KEY_EXPOSURE_TIME, rational.toSimpleString(true) + "″");
} else {
if (num != 1 && num != 0) {
rational = new Rational(1, Math.round(denom / (double) num));
}
metadataMap.put(KEY_EXPOSURE_TIME, rational.toString());
}
}
if (directory.containsTag(ExifSubIFDDirectory.TAG_ISO_EQUIVALENT)) {
metadataMap.put(KEY_ISO, "ISO" + directory.getDescription(ExifSubIFDDirectory.TAG_ISO_EQUIVALENT));
}
@ -463,12 +479,6 @@ public class MetadataHandler implements MethodChannel.MethodCallHandler {
}
}
private static void putStringFromTag(Map<String, Object> metadataMap, String key, Directory dir, int tag) {
if (dir.containsTag(tag)) {
metadataMap.put(key, dir.getString(tag));
}
}
private static void putLocalizedTextFromXmp(Map<String, Object> metadataMap, String key, XMPMeta xmpMeta, String propName) throws XMPException {
if (xmpMeta.doesPropertyExist(XMP_DC_SCHEMA_NS, propName)) {
XMPProperty item = xmpMeta.getLocalizedText(XMP_DC_SCHEMA_NS, propName, XMP_GENERIC_LANG, XMP_SPECIFIC_LANG);