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/*
* Copyright (C) 2022 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.bluetooth;
import android.annotation.NonNull;
import android.annotation.SystemApi;
import android.bluetooth.BluetoothUtils.TypeValueEntry;
import android.os.Parcel;
import android.os.Parcelable;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;
/**
* A class representing the codec specific config metadata information defined in the Basic Audio
* Profile.
*
* @hide
*/
@SystemApi
public final class BluetoothLeAudioCodecConfigMetadata implements Parcelable {
private static final int AUDIO_CHANNEL_LOCATION_TYPE = 0x03;
private final long mAudioLocation;
private final byte[] mRawMetadata;
private BluetoothLeAudioCodecConfigMetadata(long audioLocation, byte[] rawMetadata) {
mAudioLocation = audioLocation;
mRawMetadata = rawMetadata;
}
/**
* Get the audio location information as defined in the Generic Audio section of Bluetooth
* Assigned numbers.
*
* @return configured audio location, -1 if this metadata does not exist
* @hide
*/
@SystemApi
public long getAudioLocation() {
return mAudioLocation;
}
/**
* Get the raw bytes of stream metadata in Bluetooth LTV format.
*
* Bluetooth LTV format for stream metadata is defined in the Generic Audio
* section of <a href="https://www.bluetooth.com/specifications/assigned-numbers/">Bluetooth Assigned Numbers</a>,
* including metadata that was not covered by the getter methods in this class.
*
* @return raw bytes of stream metadata in Bluetooth LTV format
* @hide
*/
@SystemApi
public @NonNull byte[] getRawMetadata() {
return mRawMetadata;
}
/**
* {@inheritDoc}
* @hide
*/
@Override
public int describeContents() {
return 0;
}
/**
* {@inheritDoc}
* @hide
*/
@Override
public void writeToParcel(Parcel out, int flags) {
out.writeLong(mAudioLocation);
if (mRawMetadata != null) {
out.writeInt(mRawMetadata.length);
out.writeByteArray(mRawMetadata);
} else {
out.writeInt(-1);
}
}
/**
* A {@link Parcelable.Creator} to create {@link BluetoothLeAudioCodecConfigMetadata} from
* parcel.
* @hide
*/
@SystemApi
public static final @NonNull Parcelable.Creator<BluetoothLeAudioCodecConfigMetadata> CREATOR =
new Parcelable.Creator<BluetoothLeAudioCodecConfigMetadata>() {
@NonNull
public BluetoothLeAudioCodecConfigMetadata createFromParcel(@NonNull Parcel in) {
long audioLocation = in.readLong();
int rawMetadataLen = in.readInt();
byte[] rawMetadata;
if (rawMetadataLen != -1) {
rawMetadata = new byte[rawMetadataLen];
in.readByteArray(rawMetadata);
} else {
rawMetadata = new byte[0];
}
return new BluetoothLeAudioCodecConfigMetadata(audioLocation, rawMetadata);
}
public @NonNull BluetoothLeAudioCodecConfigMetadata[] newArray(int size) {
return new BluetoothLeAudioCodecConfigMetadata[size];
}
};
/**
* Construct a {@link BluetoothLeAudioCodecConfigMetadata} from raw bytes.
*
* The byte array will be parsed and values for each getter will be populated
*
* Raw metadata cannot be set using builder in order to maintain raw bytes and getter value
* consistency
*
* @param rawBytes raw bytes of stream metadata in Bluetooth LTV format
* @return parsed {@link BluetoothLeAudioCodecConfigMetadata} object
* @throws IllegalArgumentException if <var>rawBytes</var> is null or when the raw bytes cannot
* be parsed to build the object
* @hide
*/
@SystemApi
public static @NonNull BluetoothLeAudioCodecConfigMetadata fromRawBytes(
@NonNull byte[] rawBytes) {
if (rawBytes == null) {
throw new IllegalArgumentException("Raw bytes cannot be null");
}
List<TypeValueEntry> entries = BluetoothUtils.parseLengthTypeValueBytes(rawBytes);
if (rawBytes.length > 0 && rawBytes[0] > 0 && entries.isEmpty()) {
throw new IllegalArgumentException("No LTV entries are found from rawBytes of size "
+ rawBytes.length);
}
long audioLocation = 0;
for (TypeValueEntry entry : entries) {
if (entry.getType() == AUDIO_CHANNEL_LOCATION_TYPE) {
byte[] bytes = entry.getValue();
// Get unsigned uint32_t to long
audioLocation = ((bytes[0] & 0xFF) << 0) | ((bytes[1] & 0xFF) << 8)
| ((bytes[2] & 0xFF) << 16) | ((long) (bytes[3] & 0xFF) << 24);
}
}
return new BluetoothLeAudioCodecConfigMetadata(audioLocation, rawBytes);
}
/**
* Builder for {@link BluetoothLeAudioCodecConfigMetadata}.
* @hide
*/
@SystemApi
public static final class Builder {
private long mAudioLocation = 0;
private byte[] mRawMetadata = null;
/**
* Create an empty builder.
* @hide
*/
@SystemApi
public Builder() {}
/**
* Create a builder with copies of information from original object.
*
* @param original original object
* @hide
*/
@SystemApi
public Builder(@NonNull BluetoothLeAudioCodecConfigMetadata original) {
mAudioLocation = original.getAudioLocation();
mRawMetadata = original.getRawMetadata();
}
/**
* Set the audio location information as defined in the Generic Audio section of Bluetooth
* Assigned numbers.
*
* @param audioLocation configured audio location, -1 if does not exist
* @return this builder
* @hide
*/
@SystemApi
public @NonNull Builder setAudioLocation(long audioLocation) {
mAudioLocation = audioLocation;
return this;
}
/**
* Build {@link BluetoothLeAudioCodecConfigMetadata}.
*
* @return constructed {@link BluetoothLeAudioCodecConfigMetadata}
* @throws IllegalArgumentException if the object cannot be built
* @hide
*/
@SystemApi
public @NonNull BluetoothLeAudioCodecConfigMetadata build() {
List<TypeValueEntry> entries = new ArrayList<>();
if (mRawMetadata != null) {
entries = BluetoothUtils.parseLengthTypeValueBytes(mRawMetadata);
if (mRawMetadata.length > 0 && mRawMetadata[0] > 0 && entries.isEmpty()) {
throw new IllegalArgumentException("No LTV entries are found from rawBytes of"
+ " size " + mRawMetadata.length + " please check the original object"
+ " passed to Builder's copy constructor");
}
}
if (mAudioLocation != 0) {
entries.removeIf(entry -> entry.getType() == AUDIO_CHANNEL_LOCATION_TYPE);
entries.add(new TypeValueEntry(AUDIO_CHANNEL_LOCATION_TYPE,
ByteBuffer.allocate(Long.BYTES).putLong(mAudioLocation).array()));
}
byte[] rawBytes = BluetoothUtils.serializeTypeValue(entries);
if (rawBytes == null) {
throw new IllegalArgumentException("Failed to serialize entries to bytes");
}
return new BluetoothLeAudioCodecConfigMetadata(mAudioLocation, rawBytes);
}
}
}
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