ExifInterface: add support for reading metadata from RAW images (fe968dfc) · Commits · e / os / android_frameworks_base

media/java/android/media/ExifInterface.java

+113 −42

Original line number	Diff line number	Diff line
		@@ -17,7 +17,7 @@
		package android.media;

		import java.io.IOException;
		import java.util.regex.Matcher;
		import java.io.RandomAccessFile;
		import java.util.regex.Pattern;
		import java.text.ParsePosition;
		import java.text.SimpleDateFormat;
		@@ -27,7 +27,9 @@ import java.util.Map;
		import java.util.TimeZone;

		/**
		* This is a class for reading and writing Exif tags in a JPEG file.
		* This is a class for reading and writing Exif tags in a JPEG file or a RAW image file.
		* <p>
		* Supported formats are: JPEG, DNG, CR2, NEF, NRW, ARW, RW2, ORF and RAF.
		*/
		public class ExifInterface {
		// The Exif tag names
		@@ -68,8 +70,6 @@ public class ExifInterface {
		/** Type is int. */
		public static final String TAG_SUBSEC_TIME_DIG = "SubSecTimeDigitized";



		/**
		* @hide
		*/
		@@ -98,15 +98,22 @@ public class ExifInterface {
		/** Type is String. Name of GPS processing method used for location finding. */
		public static final String TAG_GPS_PROCESSING_METHOD = "GPSProcessingMethod";

		// Private tags used for thumbnail information.
		private static final String TAG_HAS_THUMBNAIL = "hasThumbnail";
		private static final String TAG_THUMBNAIL_OFFSET = "thumbnailOffset";
		private static final String TAG_THUMBNAIL_LENGTH = "thumbnailLength";

		// Constants used for the Orientation Exif tag.
		public static final int ORIENTATION_UNDEFINED = 0;
		public static final int ORIENTATION_NORMAL = 1;
		public static final int ORIENTATION_FLIP_HORIZONTAL = 2; // left right reversed mirror
		public static final int ORIENTATION_ROTATE_180 = 3;
		public static final int ORIENTATION_FLIP_VERTICAL = 4; // upside down mirror
		public static final int ORIENTATION_TRANSPOSE = 5; // flipped about top-left <--> bottom-right axis
		// flipped about top-left <--> bottom-right axis
		public static final int ORIENTATION_TRANSPOSE = 5;
		public static final int ORIENTATION_ROTATE_90 = 6; // rotate 90 cw to right it
		public static final int ORIENTATION_TRANSVERSE = 7; // flipped about top-right <--> bottom-left axis
		// flipped about top-right <--> bottom-left axis
		public static final int ORIENTATION_TRANSVERSE = 7;
		public static final int ORIENTATION_ROTATE_270 = 8; // rotate 270 to right it

		// Constants used for white balance
		@@ -116,13 +123,20 @@ public class ExifInterface {

		static {
		System.loadLibrary("jhead_jni");
		System.loadLibrary("media_jni");
		initRawNative();

		sFormatter = new SimpleDateFormat("yyyy:MM:dd HH:mm:ss");
		sFormatter.setTimeZone(TimeZone.getTimeZone("UTC"));
		}

		private String mFilename;
		private HashMap<String, String> mAttributes;
		private final String mFilename;
		private final HashMap<String, String> mAttributes = new HashMap<>();
		private boolean mIsRaw;
		private boolean mHasThumbnail;
		// The following values used for indicating a thumbnail position.
		private int mThumbnailOffset;
		private int mThumbnailLength;

		// Because the underlying implementation (jhead) uses static variables,
		// there can only be one user at a time for the native functions (and
		@@ -134,19 +148,20 @@ public class ExifInterface {
		private static final Pattern sNonZeroTimePattern = Pattern.compile(".[1-9].");

		/**
		* Reads Exif tags from the specified JPEG file.
		* Reads Exif tags from the specified image file.
		*/
		public ExifInterface(String filename) throws IOException {
		if (filename == null) {
		throw new IllegalArgumentException("filename cannot be null");
		}
		mFilename = filename;
		// First test whether a given file is a one of RAW format or not.
		loadAttributes();
		}

		/**
		* Returns the value of the specified tag or {@code null} if there
		* is no such tag in the JPEG file.
		* is no such tag in the image file.
		*
		* @param tag the name of the tag.
		*/
		@@ -156,7 +171,7 @@ public class ExifInterface {

		/**
		* Returns the integer value of the specified tag. If there is no such tag
		* in the JPEG file or the value cannot be parsed as integer, return
		* in the image file or the value cannot be parsed as integer, return
		* <var>defaultValue</var>.
		*
		* @param tag the name of the tag.
		@@ -174,7 +189,7 @@ public class ExifInterface {

		/**
		* Returns the double value of the specified rational tag. If there is no
		* such tag in the JPEG file or the value cannot be parsed as double, return
		* such tag in the image file or the value cannot be parsed as double, return
		* <var>defaultValue</var>.
		*
		* @param tag the name of the tag.
		@@ -210,17 +225,42 @@ public class ExifInterface {
		*
		* mAttributes is a HashMap which stores the Exif attributes of the file.
		* The key is the standard tag name and the value is the tag's value: e.g.
		* Model -> Nikon. Numeric values are stored as strings.
		* Model -> Nikon. Numeric values are stored as strings.
		*
		* This function also initialize mHasThumbnail to indicate whether the
		* file has a thumbnail inside.
		*/
		private void loadAttributes() throws IOException {
		HashMap map = getRawAttributesNative(mFilename);
		mIsRaw = map != null;
		if (mIsRaw) {
		for (Object o : map.entrySet()) {
		Map.Entry entry = (Map.Entry) o;
		String attrName = (String) entry.getKey();
		String attrValue = (String) entry.getValue();

		switch (attrName) {
		case TAG_HAS_THUMBNAIL:
		mHasThumbnail = attrValue.equalsIgnoreCase("true");
		break;
		case TAG_THUMBNAIL_OFFSET:
		mThumbnailOffset = Integer.parseInt(attrValue);
		break;
		case TAG_THUMBNAIL_LENGTH:
		mThumbnailLength = Integer.parseInt(attrValue);
		break;
		default:
		mAttributes.put(attrName, attrValue);
		break;
		}
		}
		return;
		}

		// format of string passed from native C code:
		// "attrCnt attr1=valueLen value1attr2=value2Len value2..."
		// example:
		// "4 attrPtr ImageLength=4 1024Model=6 FooImageWidth=4 1280Make=3 FOO"
		mAttributes = new HashMap<String, String>();

		String attrStr;
		synchronized (sLock) {
		@@ -248,7 +288,7 @@ public class ExifInterface {
		String attrValue = attrStr.substring(ptr, ptr + attrLen);
		ptr += attrLen;

		if (attrName.equals("hasThumbnail")) {
		if (attrName.equals(TAG_HAS_THUMBNAIL)) {
		mHasThumbnail = attrValue.equalsIgnoreCase("true");
		} else {
		mAttributes.put(attrName, attrValue);
		@@ -257,32 +297,36 @@ public class ExifInterface {
		}

		/**
		* Save the tag data into the JPEG file. This is expensive because it involves
		* copying all the JPG data from one file to another and deleting the old file
		* and renaming the other. It's best to use {@link #setAttribute(String,String)}
		* to set all attributes to write and make a single call rather than multiple
		* calls for each attribute.
		* Save the tag data into the original image file. This is expensive because it involves
		* copying all the data from one file to another and deleting the old file and renaming the
		* other. It's best to use{@link #setAttribute(String,String)} to set all attributes to write
		* and make a single call rather than multiple calls for each attribute.
		*/
		public void saveAttributes() throws IOException {
		if (mIsRaw) {
		throw new UnsupportedOperationException(
		"ExifInterface does not support saving attributes on RAW formats.");
		}

		// format of string passed to native C code:
		// "attrCnt attr1=valueLen value1attr2=value2Len value2..."
		// example:
		// "4 attrPtr ImageLength=4 1024Model=6 FooImageWidth=4 1280Make=3 FOO"
		StringBuilder sb = new StringBuilder();
		int size = mAttributes.size();
		if (mAttributes.containsKey("hasThumbnail")) {
		if (mAttributes.containsKey(TAG_HAS_THUMBNAIL)) {
		--size;
		}
		sb.append(size + " ");
		for (Map.Entry<String, String> iter : mAttributes.entrySet()) {
		String key = iter.getKey();
		if (key.equals("hasThumbnail")) {
		sb.append(size).append(" ");
		for (Map.Entry<String, String> entry : mAttributes.entrySet()) {
		String key = entry.getKey();
		if (key.equals(TAG_HAS_THUMBNAIL)) {
		// this is a fake attribute not saved as an exif tag
		continue;
		}
		String val = iter.getValue();
		sb.append(key + "=");
		sb.append(val.length() + " ");
		String val = entry.getValue();
		sb.append(key).append("=");
		sb.append(val.length()).append(" ");
		sb.append(val);
		}
		String s = sb.toString();
		@@ -293,25 +337,43 @@ public class ExifInterface {
		}

		/**
		* Returns true if the JPEG file has a thumbnail.
		* Returns true if the image file has a thumbnail.
		*/
		public boolean hasThumbnail() {
		return mHasThumbnail;
		}

		/**
		* Returns the thumbnail inside the JPEG file, or {@code null} if there is no thumbnail.
		* Returns the thumbnail inside the image file, or {@code null} if there is no thumbnail.
		* The returned data is in JPEG format and can be decoded using
		* {@link android.graphics.BitmapFactory#decodeByteArray(byte[],int,int)}
		*/
		public byte[] getThumbnail() {
		if (mIsRaw) {
		if (mHasThumbnail) {
		try (RandomAccessFile file = new RandomAccessFile(mFilename, "r")) {
		if (file.length() < mThumbnailLength + mThumbnailOffset) {
		throw new IOException("Corrupted image.");
		}
		file.seek(mThumbnailOffset);

		byte[] buffer = new byte[mThumbnailLength];
		file.readFully(buffer);
		return buffer;
		} catch (IOException e) {
		// Couldn't get a thumbnail image.
		}
		}
		return null;
		}

		synchronized (sLock) {
		return getThumbnailNative(mFilename);
		}
		}

		/**
		* Returns the offset and length of thumbnail inside the JPEG file, or
		* Returns the offset and length of thumbnail inside the image file, or
		* {@code null} if there is no thumbnail.
		*
		* @return two-element array, the offset in the first value, and length in
		@@ -319,6 +381,13 @@ public class ExifInterface {
		* @hide
		*/
		public long[] getThumbnailRange() {
		if (mIsRaw) {
		long[] range = new long[2];
		range[0] = mThumbnailOffset;
		range[1] = mThumbnailLength;
		return range;
		}

		synchronized (sLock) {
		return getThumbnailRangeNative(mFilename);
		}
		@@ -447,26 +516,28 @@ public class ExifInterface {
		return (float) -result;
		}
		return (float) result;
		} catch (NumberFormatException e) {
		// Some of the nubmers are not valid
		throw new IllegalArgumentException();
		} catch (ArrayIndexOutOfBoundsException e) {
		// Some of the rational does not follow the correct format
		} catch (NumberFormatException \| ArrayIndexOutOfBoundsException e) {
		// Not valid
		throw new IllegalArgumentException();
		}
		}

		private native boolean appendThumbnailNative(String fileName,
		// JNI methods for JPEG.
		private static native boolean appendThumbnailNative(String fileName,
		String thumbnailFileName);

		private native void saveAttributesNative(String fileName,
		private static native void saveAttributesNative(String fileName,
		String compressedAttributes);

		private native String getAttributesNative(String fileName);
		private static native String getAttributesNative(String fileName);

		private static native void commitChangesNative(String fileName);

		private native void commitChangesNative(String fileName);
		private static native byte[] getThumbnailNative(String fileName);

		private native byte[] getThumbnailNative(String fileName);
		private static native long[] getThumbnailRangeNative(String fileName);

		private native long[] getThumbnailRangeNative(String fileName);
		// JNI methods for RAW formats.
		private static native void initRawNative();
		private static native HashMap getRawAttributesNative(String filename);
		}

media/jni/Android.mk

+3 −0

Original line number	Diff line number	Diff line
		@@ -3,6 +3,7 @@ include $(CLEAR_VARS)

		LOCAL_SRC_FILES:= \
		android_media_AmrInputStream.cpp \
		android_media_ExifInterface.cpp \
		android_media_ImageWriter.cpp \
		android_media_ImageReader.cpp \
		android_media_MediaCrypto.cpp \
		@@ -44,6 +45,7 @@ LOCAL_SHARED_LIBRARIES := \
		libusbhost \
		libjhead \
		libexif \
		libpiex \
		libstagefright_amrnb_common

		LOCAL_REQUIRED_MODULES := \
		@@ -54,6 +56,7 @@ LOCAL_STATIC_LIBRARIES := \

		LOCAL_C_INCLUDES += \
		external/libexif/ \
		external/piex/ \
		external/tremor/Tremor \
		frameworks/base/core/jni \
		frameworks/base/libs/hwui \

media/jni/android_media_ExifInterface.cpp

0 → 100644

+364 −0

File added.

Preview size limit exceeded, changes collapsed.

media/jni/android_media_MediaPlayer.cpp

+6 −0

Original line number	Diff line number	Diff line
		@@ -1088,6 +1088,7 @@ static int register_android_media_MediaPlayer(JNIEnv *env)
		return AndroidRuntime::registerNativeMethods(env,
		"android/media/MediaPlayer", gMethods, NELEM(gMethods));
		}
		extern int register_android_media_ExifInterface(JNIEnv *env);
		extern int register_android_media_ImageReader(JNIEnv *env);
		extern int register_android_media_ImageWriter(JNIEnv *env);
		extern int register_android_media_Crypto(JNIEnv *env);
		@@ -1219,6 +1220,11 @@ jint JNI_OnLoad(JavaVM* vm, void* /* reserved */)
		goto bail;
		}

		if (register_android_media_ExifInterface(env) < 0) {
		ALOGE("ERROR: ExifInterface native registration failed");
		goto bail;
		}

		/* success -- return valid version number */
		result = JNI_VERSION_1_4;