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A library jar that provides APIs for Applications written for the Google Android Platform.
/*
* Copyright 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.media;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.os.Bundle;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.Objects;
/**
* MediaMetrics is the Java interface to the MediaMetrics service.
*
* This is used to collect media statistics by the framework.
* It is not intended for direct application use.
*
* @hide
*/
public class MediaMetrics {
public static final String TAG = "MediaMetrics";
public static final String SEPARATOR = ".";
/**
* A list of established MediaMetrics names that can be used for Items.
*/
public static class Name {
public static final String AUDIO = "audio";
public static final String AUDIO_BLUETOOTH = AUDIO + SEPARATOR + "bluetooth";
public static final String AUDIO_DEVICE = AUDIO + SEPARATOR + "device";
public static final String AUDIO_FOCUS = AUDIO + SEPARATOR + "focus";
public static final String AUDIO_FORCE_USE = AUDIO + SEPARATOR + "forceUse";
public static final String AUDIO_MIC = AUDIO + SEPARATOR + "mic";
public static final String AUDIO_SERVICE = AUDIO + SEPARATOR + "service";
public static final String AUDIO_VOLUME = AUDIO + SEPARATOR + "volume";
public static final String AUDIO_VOLUME_EVENT = AUDIO_VOLUME + SEPARATOR + "event";
public static final String AUDIO_MODE = AUDIO + SEPARATOR + "mode";
public static final String METRICS_MANAGER = "metrics" + SEPARATOR + "manager";
}
/**
* A list of established string values.
*/
public static class Value {
public static final String CONNECT = "connect";
public static final String CONNECTED = "connected";
public static final String DISCONNECT = "disconnect";
public static final String DISCONNECTED = "disconnected";
public static final String DOWN = "down";
public static final String MUTE = "mute";
public static final String NO = "no";
public static final String OFF = "off";
public static final String ON = "on";
public static final String UNMUTE = "unmute";
public static final String UP = "up";
public static final String YES = "yes";
}
/**
* A list of standard property keys for consistent use and type.
*/
public static class Property {
// A use for Bluetooth or USB device addresses
public static final Key ADDRESS = createKey("address", String.class);
// A string representing the Audio Attributes
public static final Key ATTRIBUTES = createKey("attributes", String.class);
// The calling package responsible for the state change
public static final Key CALLING_PACKAGE =
createKey("callingPackage", String.class);
// The client name
public static final Key CLIENT_NAME = createKey("clientName", String.class);
// The device type
public static final Key DELAY_MS = createKey("delayMs", Integer.class);
// The device type
public static final Key DEVICE = createKey("device", String.class);
// For volume changes, up or down
public static final Key DIRECTION = createKey("direction", String.class);
// A reason for early return or error
public static final Key EARLY_RETURN =
createKey("earlyReturn", String.class);
// ENCODING_ ... string to match AudioFormat encoding
public static final Key ENCODING = createKey("encoding", String.class);
public static final Key EVENT = createKey("event#", String.class);
// Generally string "true" or "false"
public static final Key ENABLED = createKey("enabled", String.class);
// event generated is external (yes, no)
public static final Key EXTERNAL = createKey("external", String.class);
public static final Key FLAGS = createKey("flags", Integer.class);
public static final Key FOCUS_CHANGE_HINT =
createKey("focusChangeHint", String.class);
public static final Key FORCE_USE_DUE_TO =
createKey("forceUseDueTo", String.class);
public static final Key FORCE_USE_MODE =
createKey("forceUseMode", String.class);
public static final Key GAIN_DB =
createKey("gainDb", Double.class);
public static final Key GROUP =
createKey("group", String.class);
// Generally string "true" or "false"
public static final Key HAS_HEAD_TRACKER =
createKey("hasHeadTracker", String.class); // spatializer
// Generally string "true" or "false"
public static final Key HEAD_TRACKER_ENABLED =
createKey("headTrackerEnabled", String.class); // spatializer
public static final Key INDEX = createKey("index", Integer.class); // volume
public static final Key LOG_SESSION_ID = createKey("logSessionId", String.class);
public static final Key MAX_INDEX = createKey("maxIndex", Integer.class); // vol
public static final Key MIN_INDEX = createKey("minIndex", Integer.class); // vol
public static final Key MODE =
createKey("mode", String.class); // audio_mode
public static final Key MUTE =
createKey("mute", String.class); // microphone, on or off.
// Bluetooth or Usb device name
public static final Key NAME =
createKey("name", String.class);
// Number of observers
public static final Key OBSERVERS =
createKey("observers", Integer.class);
public static final Key REQUEST =
createKey("request", String.class);
// For audio mode
public static final Key REQUESTED_MODE =
createKey("requestedMode", String.class); // audio_mode
// For Bluetooth
public static final Key SCO_AUDIO_MODE =
createKey("scoAudioMode", String.class);
public static final Key SDK = createKey("sdk", Integer.class);
public static final Key STATE = createKey("state", String.class);
public static final Key STATUS = createKey("status", Integer.class);
public static final Key STREAM_TYPE = createKey("streamType", String.class);
}
/**
* The TYPE constants below should match those in native MediaMetricsItem.h
*/
private static final int TYPE_NONE = 0;
private static final int TYPE_INT32 = 1; // Java integer
private static final int TYPE_INT64 = 2; // Java long
private static final int TYPE_DOUBLE = 3; // Java double
private static final int TYPE_CSTRING = 4; // Java string
private static final int TYPE_RATE = 5; // Two longs, ignored in Java
// The charset used for encoding Strings to bytes.
private static final Charset MEDIAMETRICS_CHARSET = StandardCharsets.UTF_8;
/**
* Key interface.
*
* The presence of this {@code Key} interface on an object allows
* it to be used to set metrics.
*
* @param type of value associated with {@code Key}.
*/
public interface Key {
/**
* Returns the internal name of the key.
*/
@NonNull
String getName();
/**
* Returns the class type of the associated value.
*/
@NonNull
Class getValueClass();
}
/**
* Returns a Key object with the correct interface for MediaMetrics.
*
* @param name The name of the key.
* @param type The class type of the value represented by the key.
* @param The type of value.
* @return a new key interface.
*/
@NonNull
public static Key createKey(@NonNull String name, @NonNull Class type) {
// Implementation specific.
return new Key() {
private final String mName = name;
private final Class mType = type;
@Override
@NonNull
public String getName() {
return mName;
}
@Override
@NonNull
public Class getValueClass() {
return mType;
}
/**
* Return true if the name and the type of two objects are the same.
*/
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof Key)) {
return false;
}
Key other = (Key) obj;
return mName.equals(other.getName()) && mType.equals(other.getValueClass());
}
@Override
public int hashCode() {
return Objects.hash(mName, mType);
}
};
}
/**
* Item records properties and delivers to the MediaMetrics service
*
*/
public static class Item {
/*
* MediaMetrics Item
*
* Creates a Byte String and sends to the MediaMetrics service.
* The Byte String serves as a compact form for logging data
* with low overhead for storage.
*
* The Byte String format is as follows:
*
* For Java
* int64 corresponds to long
* int32, uint32 corresponds to int
* uint16 corresponds to char
* uint8, int8 corresponds to byte
*
* For items transmitted from Java, uint8 and uint32 values are limited
* to INT8_MAX and INT32_MAX. This constrains the size of large items
* to 2GB, which is consistent with ByteBuffer max size. A native item
* can conceivably have size of 4GB.
*
* Physical layout of integers and doubles within the MediaMetrics byte string
* is in Native / host order, which is usually little endian.
*
* Note that primitive data (ints, doubles) within a Byte String has
* no extra padding or alignment requirements, like ByteBuffer.
*
* -- begin of item
* -- begin of header
* (uint32) item size: including the item size field
* (uint32) header size, including the item size and header size fields.
* (uint16) version: exactly 0
* (uint16) key size, that is key strlen + 1 for zero termination.
* (int8)+ key, a string which is 0 terminated (UTF-8).
* (int32) pid
* (int32) uid
* (int64) timestamp
* -- end of header
* -- begin body
* (uint32) number of properties
* -- repeat for number of properties
* (uint16) property size, including property size field itself
* (uint8) type of property
* (int8)+ key string, including 0 termination
* based on type of property (given above), one of:
* (int32)
* (int64)
* (double)
* (int8)+ for TYPE_CSTRING, including 0 termination
* (int64, int64) for rate
* -- end body
* -- end of item
*
* To record a MediaMetrics event, one creates a new item with an id,
* then use a series of puts to add properties
* and then a record() to send to the MediaMetrics service.
*
* The properties may not be unique, and putting a later property with
* the same name as an earlier property will overwrite the value and type
* of the prior property.
*
* The timestamp can only be recorded by a system service (and is ignored otherwise;
* the MediaMetrics service will fill in the timestamp as needed).
*
* The units of time are in SystemClock.elapsedRealtimeNanos().
*
* A clear() may be called to reset the properties to empty, the time to 0, but keep
* the other entries the same. This may be called after record().
* Additional properties may be added after calling record(). Changing the same property
* repeatedly is discouraged as - for this particular implementation - extra data
* is stored per change.
*
* new MediaMetrics.Item(mSomeId)
* .putString("event", "javaCreate")
* .putInt("value", intValue)
* .record();
*/
/**
* Creates an Item with server added uid, time.
*
* This is the typical way to record a MediaMetrics item.
*
* @param key the Metrics ID associated with the item.
*/
public Item(String key) {
this(key, -1 /* pid */, -1 /* uid */, 0 /* SystemClock.elapsedRealtimeNanos() */,
2048 /* capacity */);
}
/**
* Creates an Item specifying pid, uid, time, and initial Item capacity.
*
* This might be used by a service to specify a different PID or UID for a client.
*
* @param key the Metrics ID associated with the item.
* An app may only set properties on an item which has already been
* logged previously by a service.
* @param pid the process ID corresponding to the item.
* A value of -1 (or a record() from an app instead of a service) causes
* the MediaMetrics service to fill this in.
* @param uid the user ID corresponding to the item.
* A value of -1 (or a record() from an app instead of a service) causes
* the MediaMetrics service to fill this in.
* @param timeNs the time when the item occurred (may be in the past).
* A value of 0 (or a record() from an app instead of a service) causes
* the MediaMetrics service to fill it in.
* Should be obtained from SystemClock.elapsedRealtimeNanos().
* @param capacity the anticipated size to use for the buffer.
* If the capacity is too small, the buffer will be resized to accommodate.
* This is amortized to copy data no more than twice.
*/
public Item(String key, int pid, int uid, long timeNs, int capacity) {
final byte[] keyBytes = key.getBytes(MEDIAMETRICS_CHARSET);
final int keyLength = keyBytes.length;
if (keyLength > Character.MAX_VALUE - 1) {
throw new IllegalArgumentException("Key length too large");
}
// Version 0 - compute the header offsets here.
mHeaderSize = 4 + 4 + 2 + 2 + keyLength + 1 + 4 + 4 + 8; // see format above.
mPidOffset = mHeaderSize - 16;
mUidOffset = mHeaderSize - 12;
mTimeNsOffset = mHeaderSize - 8;
mPropertyCountOffset = mHeaderSize;
mPropertyStartOffset = mHeaderSize + 4;
mKey = key;
mBuffer = ByteBuffer.allocateDirect(
Math.max(capacity, mHeaderSize + MINIMUM_PAYLOAD_SIZE));
// Version 0 - fill the ByteBuffer with the header (some details updated later).
mBuffer.order(ByteOrder.nativeOrder())
.putInt((int) 0) // total size in bytes (filled in later)
.putInt((int) mHeaderSize) // size of header
.putChar((char) FORMAT_VERSION) // version
.putChar((char) (keyLength + 1)) // length, with zero termination
.put(keyBytes).put((byte) 0)
.putInt(pid)
.putInt(uid)
.putLong(timeNs);
if (mHeaderSize != mBuffer.position()) {
throw new IllegalStateException("Mismatched sizing");
}
mBuffer.putInt(0); // number of properties (to be later filled in by record()).
}
/**
* Sets a metrics typed key
* @param key
* @param value
* @param
* @return
*/
@NonNull
public Item set(@NonNull Key key, @Nullable T value) {
if (value instanceof Integer) {
putInt(key.getName(), (int) value);
} else if (value instanceof Long) {
putLong(key.getName(), (long) value);
} else if (value instanceof Double) {
putDouble(key.getName(), (double) value);
} else if (value instanceof String) {
putString(key.getName(), (String) value);
}
// if value is null, etc. no error is raised.
return this;
}
/**
* Sets the property with key to an integer (32 bit) value.
*
* @param key
* @param value
* @return itself
*/
public Item putInt(String key, int value) {
final byte[] keyBytes = key.getBytes(MEDIAMETRICS_CHARSET);
final char propSize = (char) reserveProperty(keyBytes, 4 /* payloadSize */);
final int estimatedFinalPosition = mBuffer.position() + propSize;
mBuffer.putChar(propSize)
.put((byte) TYPE_INT32)
.put(keyBytes).put((byte) 0) // key, zero terminated
.putInt(value);
++mPropertyCount;
if (mBuffer.position() != estimatedFinalPosition) {
throw new IllegalStateException("Final position " + mBuffer.position()
+ " != estimatedFinalPosition " + estimatedFinalPosition);
}
return this;
}
/**
* Sets the property with key to a long (64 bit) value.
*
* @param key
* @param value
* @return itself
*/
public Item putLong(String key, long value) {
final byte[] keyBytes = key.getBytes(MEDIAMETRICS_CHARSET);
final char propSize = (char) reserveProperty(keyBytes, 8 /* payloadSize */);
final int estimatedFinalPosition = mBuffer.position() + propSize;
mBuffer.putChar(propSize)
.put((byte) TYPE_INT64)
.put(keyBytes).put((byte) 0) // key, zero terminated
.putLong(value);
++mPropertyCount;
if (mBuffer.position() != estimatedFinalPosition) {
throw new IllegalStateException("Final position " + mBuffer.position()
+ " != estimatedFinalPosition " + estimatedFinalPosition);
}
return this;
}
/**
* Sets the property with key to a double value.
*
* @param key
* @param value
* @return itself
*/
public Item putDouble(String key, double value) {
final byte[] keyBytes = key.getBytes(MEDIAMETRICS_CHARSET);
final char propSize = (char) reserveProperty(keyBytes, 8 /* payloadSize */);
final int estimatedFinalPosition = mBuffer.position() + propSize;
mBuffer.putChar(propSize)
.put((byte) TYPE_DOUBLE)
.put(keyBytes).put((byte) 0) // key, zero terminated
.putDouble(value);
++mPropertyCount;
if (mBuffer.position() != estimatedFinalPosition) {
throw new IllegalStateException("Final position " + mBuffer.position()
+ " != estimatedFinalPosition " + estimatedFinalPosition);
}
return this;
}
/**
* Sets the property with key to a String value.
*
* @param key
* @param value
* @return itself
*/
public Item putString(String key, String value) {
final byte[] keyBytes = key.getBytes(MEDIAMETRICS_CHARSET);
final byte[] valueBytes = value.getBytes(MEDIAMETRICS_CHARSET);
final char propSize = (char) reserveProperty(keyBytes, valueBytes.length + 1);
final int estimatedFinalPosition = mBuffer.position() + propSize;
mBuffer.putChar(propSize)
.put((byte) TYPE_CSTRING)
.put(keyBytes).put((byte) 0) // key, zero terminated
.put(valueBytes).put((byte) 0); // value, zero term.
++mPropertyCount;
if (mBuffer.position() != estimatedFinalPosition) {
throw new IllegalStateException("Final position " + mBuffer.position()
+ " != estimatedFinalPosition " + estimatedFinalPosition);
}
return this;
}
/**
* Sets the pid to the provided value.
*
* @param pid which can be -1 if the service is to fill it in from the calling info.
* @return itself
*/
public Item setPid(int pid) {
mBuffer.putInt(mPidOffset, pid); // pid location in byte string.
return this;
}
/**
* Sets the uid to the provided value.
*
* The UID represents the client associated with the property. This must be the UID
* of the application if it comes from the application client.
*
* Trusted services are allowed to set the uid for a client-related item.
*
* @param uid which can be -1 if the service is to fill it in from calling info.
* @return itself
*/
public Item setUid(int uid) {
mBuffer.putInt(mUidOffset, uid); // uid location in byte string.
return this;
}
/**
* Sets the timestamp to the provided value.
*
* The time is referenced by the Boottime obtained by SystemClock.elapsedRealtimeNanos().
* This should be associated with the occurrence of the event. It is recommended that
* the event be registered immediately when it occurs, and no later than 500ms
* (and certainly not in the future).
*
* @param timeNs which can be 0 if the service is to fill it in at the time of call.
* @return itself
*/
public Item setTimestamp(long timeNs) {
mBuffer.putLong(mTimeNsOffset, timeNs); // time location in byte string.
return this;
}
/**
* Clears the properties and resets the time to 0.
*
* No other values are changed.
*
* @return itself
*/
public Item clear() {
mBuffer.position(mPropertyStartOffset);
mBuffer.limit(mBuffer.capacity());
mBuffer.putLong(mTimeNsOffset, 0); // reset time.
mPropertyCount = 0;
return this;
}
/**
* Sends the item to the MediaMetrics service.
*
* The item properties are unchanged, hence record() may be called more than once
* to send the same item twice. Also, record() may be called without any properties.
*
* @return true if successful.
*/
public boolean record() {
updateHeader();
return native_submit_bytebuffer(mBuffer, mBuffer.limit()) >= 0;
}
/**
* Converts the Item to a Bundle.
*
* This is primarily used as a test API for CTS.
*
* @return a Bundle with the keys set according to data in the Item's buffer.
*/
public Bundle toBundle() {
updateHeader();
final ByteBuffer buffer = mBuffer.duplicate();
buffer.order(ByteOrder.nativeOrder()) // restore order property
.flip(); // convert from write buffer to read buffer
return toBundle(buffer);
}
// The following constants are used for tests to extract
// the content of the Bundle for CTS testing.
public static final String BUNDLE_TOTAL_SIZE = "_totalSize";
public static final String BUNDLE_HEADER_SIZE = "_headerSize";
public static final String BUNDLE_VERSION = "_version";
public static final String BUNDLE_KEY_SIZE = "_keySize";
public static final String BUNDLE_KEY = "_key";
public static final String BUNDLE_PID = "_pid";
public static final String BUNDLE_UID = "_uid";
public static final String BUNDLE_TIMESTAMP = "_timestamp";
public static final String BUNDLE_PROPERTY_COUNT = "_propertyCount";
/**
* Converts a buffer contents to a bundle
*
* This is primarily used as a test API for CTS.
*
* @param buffer contains the byte data serialized according to the byte string version.
* @return a Bundle with the keys set according to data in the buffer.
*/
public static Bundle toBundle(ByteBuffer buffer) {
final Bundle bundle = new Bundle();
final int totalSize = buffer.getInt();
final int headerSize = buffer.getInt();
final char version = buffer.getChar();
final char keySize = buffer.getChar(); // includes zero termination, i.e. keyLength + 1
if (totalSize < 0 || headerSize < 0) {
throw new IllegalArgumentException("Item size cannot be > " + Integer.MAX_VALUE);
}
final String key;
if (keySize > 0) {
key = getStringFromBuffer(buffer, keySize);
} else {
throw new IllegalArgumentException("Illegal null key");
}
final int pid = buffer.getInt();
final int uid = buffer.getInt();
final long timestamp = buffer.getLong();
// Verify header size (depending on version).
final int headerRead = buffer.position();
if (version == 0) {
if (headerRead != headerSize) {
throw new IllegalArgumentException(
"Item key:" + key
+ " headerRead:" + headerRead + " != headerSize:" + headerSize);
}
} else {
// future versions should only increase header size
// by adding to the end.
if (headerRead > headerSize) {
throw new IllegalArgumentException(
"Item key:" + key
+ " headerRead:" + headerRead + " > headerSize:" + headerSize);
} else if (headerRead < headerSize) {
buffer.position(headerSize);
}
}
// Body always starts with properties.
final int propertyCount = buffer.getInt();
if (propertyCount < 0) {
throw new IllegalArgumentException(
"Cannot have more than " + Integer.MAX_VALUE + " properties");
}
bundle.putInt(BUNDLE_TOTAL_SIZE, totalSize);
bundle.putInt(BUNDLE_HEADER_SIZE, headerSize);
bundle.putChar(BUNDLE_VERSION, version);
bundle.putChar(BUNDLE_KEY_SIZE, keySize);
bundle.putString(BUNDLE_KEY, key);
bundle.putInt(BUNDLE_PID, pid);
bundle.putInt(BUNDLE_UID, uid);
bundle.putLong(BUNDLE_TIMESTAMP, timestamp);
bundle.putInt(BUNDLE_PROPERTY_COUNT, propertyCount);
for (int i = 0; i < propertyCount; ++i) {
final int initialBufferPosition = buffer.position();
final char propSize = buffer.getChar();
final byte type = buffer.get();
// Log.d(TAG, "(" + i + ") propSize:" + ((int)propSize) + " type:" + type);
final String propKey = getStringFromBuffer(buffer);
switch (type) {
case TYPE_INT32:
bundle.putInt(propKey, buffer.getInt());
break;
case TYPE_INT64:
bundle.putLong(propKey, buffer.getLong());
break;
case TYPE_DOUBLE:
bundle.putDouble(propKey, buffer.getDouble());
break;
case TYPE_CSTRING:
bundle.putString(propKey, getStringFromBuffer(buffer));
break;
case TYPE_NONE:
break; // ignore on Java side
case TYPE_RATE:
buffer.getLong(); // consume the first int64_t of rate
buffer.getLong(); // consume the second int64_t of rate
break; // ignore on Java side
default:
// These are unsupported types for version 0
// We ignore them if the version is greater than 0.
if (version == 0) {
throw new IllegalArgumentException(
"Property " + propKey + " has unsupported type " + type);
}
buffer.position(initialBufferPosition + propSize); // advance and skip
break;
}
final int deltaPosition = buffer.position() - initialBufferPosition;
if (deltaPosition != propSize) {
throw new IllegalArgumentException("propSize:" + propSize
+ " != deltaPosition:" + deltaPosition);
}
}
final int finalPosition = buffer.position();
if (finalPosition != totalSize) {
throw new IllegalArgumentException("totalSize:" + totalSize
+ " != finalPosition:" + finalPosition);
}
return bundle;
}
// Version 0 byte offsets for the header.
private static final int FORMAT_VERSION = 0;
private static final int TOTAL_SIZE_OFFSET = 0;
private static final int HEADER_SIZE_OFFSET = 4;
private static final int MINIMUM_PAYLOAD_SIZE = 4;
private final int mPidOffset; // computed in constructor
private final int mUidOffset; // computed in constructor
private final int mTimeNsOffset; // computed in constructor
private final int mPropertyCountOffset; // computed in constructor
private final int mPropertyStartOffset; // computed in constructor
private final int mHeaderSize; // computed in constructor
private final String mKey;
private ByteBuffer mBuffer; // may be reallocated if capacity is insufficient.
private int mPropertyCount = 0; // overflow not checked (mBuffer would overflow first).
private int reserveProperty(byte[] keyBytes, int payloadSize) {
final int keyLength = keyBytes.length;
if (keyLength > Character.MAX_VALUE) {
throw new IllegalStateException("property key too long "
+ new String(keyBytes, MEDIAMETRICS_CHARSET));
}
if (payloadSize > Character.MAX_VALUE) {
throw new IllegalStateException("payload too large " + payloadSize);
}
// See the byte string property format above.
final int size = 2 /* length */
+ 1 /* type */
+ keyLength + 1 /* key length with zero termination */
+ payloadSize; /* payload size */
if (size > Character.MAX_VALUE) {
throw new IllegalStateException("Item property "
+ new String(keyBytes, MEDIAMETRICS_CHARSET) + " is too large to send");
}
if (mBuffer.remaining() < size) {
int newCapacity = mBuffer.position() + size;
if (newCapacity > Integer.MAX_VALUE >> 1) {
throw new IllegalStateException(
"Item memory requirements too large: " + newCapacity);
}
newCapacity <<= 1;
ByteBuffer buffer = ByteBuffer.allocateDirect(newCapacity);
buffer.order(ByteOrder.nativeOrder());
// Copy data from old buffer to new buffer.
mBuffer.flip();
buffer.put(mBuffer);
// set buffer to new buffer
mBuffer = buffer;
}
return size;
}
// Used for test
private static String getStringFromBuffer(ByteBuffer buffer) {
return getStringFromBuffer(buffer, Integer.MAX_VALUE);
}
// Used for test
private static String getStringFromBuffer(ByteBuffer buffer, int size) {
int i = buffer.position();
int limit = buffer.limit();
if (size < Integer.MAX_VALUE - i && i + size < limit) {
limit = i + size;
}
for (; i < limit; ++i) {
if (buffer.get(i) == 0) {
final int newPosition = i + 1;
if (size != Integer.MAX_VALUE && newPosition - buffer.position() != size) {
throw new IllegalArgumentException("chars consumed at " + i + ": "
+ (newPosition - buffer.position()) + " != size: " + size);
}
final String found;
if (buffer.hasArray()) {
found = new String(
buffer.array(), buffer.position() + buffer.arrayOffset(),
i - buffer.position(), MEDIAMETRICS_CHARSET);
buffer.position(newPosition);
} else {
final byte[] array = new byte[i - buffer.position()];
buffer.get(array);
found = new String(array, MEDIAMETRICS_CHARSET);
buffer.get(); // remove 0.
}
return found;
}
}
throw new IllegalArgumentException(
"No zero termination found in string position: "
+ buffer.position() + " end: " + i);
}
/**
* May be called multiple times - just makes the header consistent with the current
* properties written.
*/
private void updateHeader() {
// Buffer sized properly in constructor.
mBuffer.putInt(TOTAL_SIZE_OFFSET, mBuffer.position()) // set total length
.putInt(mPropertyCountOffset, (char) mPropertyCount); // set number of properties
}
}
private static native int native_submit_bytebuffer(@NonNull ByteBuffer buffer, int length);
}