le_audio/packages/apps/Bluetooth/src/com/android/bluetooth/acm/AcmNativeInterface.java

/******************************************************************************
 *
 *  Copyright 2021 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 com.android.bluetooth.acm;

import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothCodecConfig;
import android.bluetooth.BluetoothCodecStatus;
import android.bluetooth.BluetoothDevice;
import android.util.Log;
import java.util.List;

import com.android.bluetooth.Utils;
import com.android.internal.annotations.GuardedBy;
import com.android.internal.annotations.VisibleForTesting;

/**
 * ACM Native Interface to/from JNI.
 */
public class AcmNativeInterface {
    private static final String TAG = "AcmNativeInterface";
    private static final boolean DBG = true;
    private BluetoothAdapter mAdapter;
    static final int CONTEXT_TYPE_UNKNOWN = 0;
    static final int CONTEXT_TYPE_MUSIC = 1;
    static final int CONTEXT_TYPE_VOICE = 2;
    static final int CONTEXT_TYPE_MUSIC_VOICE = 3;
    @GuardedBy("INSTANCE_LOCK")
    private static AcmNativeInterface sInstance;
    private static final Object INSTANCE_LOCK = new Object();

    static {
        classInitNative();
    }

    @VisibleForTesting
    private AcmNativeInterface() {
        mAdapter = BluetoothAdapter.getDefaultAdapter();
        if (mAdapter == null) {
            Log.wtf(TAG, "No Bluetooth Adapter Available");
        }
    }

    /**
     * Get singleton instance.
     */
    public static AcmNativeInterface getInstance() {
        synchronized (INSTANCE_LOCK) {
            if (sInstance == null) {
                sInstance = new AcmNativeInterface();
            }
            return sInstance;
        }
    }

    /**
     * Initializes the native interface.
     *
     * @param maxConnectedAudioDevices maximum number of A2DP Sink devices that can be connected
     * simultaneously
     * @param codecConfigPriorities an array with the codec configuration
     * priorities to configure.
     */
    public void init(int maxConnectedAudioDevices, BluetoothCodecConfig[] codecConfigPriorities) {
        initNative(maxConnectedAudioDevices, codecConfigPriorities);
    }


    /**
     * Initiates ACM connection to a remote device.
     *
     * @param device the remote device
     * @return true on success, otherwise false.
     */
    public boolean connectAcm(BluetoothDevice device, int contextType, int profileType, int preferredContext) {
        return connectAcmNative(getByteAddress(device), contextType, profileType, preferredContext);
    }

    /**
     * Disconnects ACM from a remote device.
     *
     * @param device the remote device
     * @return true on success, otherwise false.
     */
    public boolean disconnectAcm(BluetoothDevice device, int contextType) {
        return disconnectAcmNative(getByteAddress(device), contextType);
    }

    /**
     * Sets a connected ACM group/remote as active.
     *
     * @param device the remote device
     * @return true on success, otherwise false.
     */
    public boolean setActiveDevice(BluetoothDevice device, int contextType) {
        return setActiveDeviceNative(getByteAddress(device), contextType);
    }

    /**
     * Sends Start stream to remote group/remote for voice call.
     *
     * @param device the remote device
     * @return true on success, otherwise false.
     */
    public boolean startStream(BluetoothDevice device, int contextType) {
        return startStreamNative(getByteAddress(device), contextType);
    }

    /**
     * Sends Stop stream to remote group/remote for voice call.
     *
     * @param device the remote device
     * @return true on success, otherwise false.
     */
    public boolean stopStream(BluetoothDevice device, int contextType) {
        return stopStreamNative(getByteAddress(device), contextType);
    }

    /**
     * Sets the codec configuration preferences.
     *
     * @param device the remote Bluetooth device
     * @param codecConfigArray an array with the codec configurations to
     * configure.
     * @return true on success, otherwise false.
     */
    public boolean setCodecConfigPreference(BluetoothDevice device, BluetoothCodecConfig[] codecConfigArray,
                                                     int contextType, int preferredContext) {
        return setCodecConfigPreferenceNative(getByteAddress(device), codecConfigArray,
                                              contextType, preferredContext);
    }

    public boolean ChangeCodecConfigPreference(BluetoothDevice device,
                                               String message) {
        return ChangeCodecConfigPreferenceNative(getByteAddress(device), message);
    }
    /**
     * Cleanup the native interface.
     */
    public void cleanup() {
        cleanupNative();
    }

    private BluetoothDevice getDevice(byte[] address) {
        return mAdapter.getRemoteDevice(address);
    }

    private byte[] getByteAddress(BluetoothDevice device) {
        if (device == null) {
            return Utils.getBytesFromAddress("00:00:00:00:00:00");
        }
        return Utils.getBytesFromAddress(device.getAddress());
    }

    private void sendMessageToService(AcmStackEvent event) {
        AcmService service = AcmService.getAcmService();
        if (service != null) {
            service.messageFromNative(event);
        } else {
            Log.w(TAG, "Event ignored, service not available: " + event);
        }
    }

    // Callbacks from the native stack back into the Java framework.
    // All callbacks are routed via the Service which will disambiguate which
    // state machine the message should be routed to.

    private void onConnectionStateChanged(byte[] address, int state, int contextType) {
        AcmStackEvent event =
                new AcmStackEvent(AcmStackEvent.EVENT_TYPE_CONNECTION_STATE_CHANGED);
        event.device = getDevice(address);
        event.valueInt1 = state;
        event.valueInt2 = contextType;

        if (DBG) {
            Log.d(TAG, "onConnectionStateChanged: " + event);
        }
        sendMessageToService(event);
    }

    private void onAudioStateChanged(byte[] address, int state, int contextType) {
        AcmStackEvent event = new AcmStackEvent(AcmStackEvent.EVENT_TYPE_AUDIO_STATE_CHANGED);
        event.device = getDevice(address);
        event.valueInt1 = state;
        event.valueInt2 = contextType;

        if (DBG) {
            Log.d(TAG, "onAudioStateChanged: " + event);
        }
        sendMessageToService(event);
    }

    private void onCodecConfigChanged(byte[] address,
            BluetoothCodecConfig newCodecConfig,
            BluetoothCodecConfig[] codecsLocalCapabilities,
            BluetoothCodecConfig[] codecsSelectableCapabilities, int contextType) {
        AcmStackEvent event = new AcmStackEvent(AcmStackEvent.EVENT_TYPE_CODEC_CONFIG_CHANGED);
        event.device = getDevice(address);
        event.codecStatus = new BluetoothCodecStatus(newCodecConfig,
                                                     codecsLocalCapabilities,
                                                     codecsSelectableCapabilities);
        event.valueInt2 = contextType;
        if (DBG) {
            Log.d(TAG, "onCodecConfigChanged: " + event);
        }
        sendMessageToService(event);
    }

    // Native methods that call into the JNI interface
    private static native void classInitNative();
    private native void initNative(int maxConnectedAudioDevices,
                                   BluetoothCodecConfig[] codecConfigPriorities);
    private native boolean connectAcmNative(byte[] address, int contextType, int profileType, int preferredContext);
    private native boolean disconnectAcmNative(byte[] address, int contextType);
    private native boolean setActiveDeviceNative(byte[] address, int contextType);
    private native boolean startStreamNative(byte[] address, int contextType);
    private native boolean stopStreamNative(byte[] address, int contextType);
    private native boolean setCodecConfigPreferenceNative(byte[] address,
                BluetoothCodecConfig[] codecConfigArray, int contextType, int preferredContext);
    private native boolean ChangeCodecConfigPreferenceNative(byte[] address, String Id);
    private native void cleanupNative();
}