bluetooth/audio/2.2/IBluetoothAudioProvidersFactory.hal

/*
 * 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 android.hardware.bluetooth.audio@2.2;

import IBluetoothAudioProvider;
import @2.1::IBluetoothAudioProvidersFactory;
import @2.0::Status;
import @2.1::SessionType;

/**
 * This factory allows a HAL implementation to be split into multiple
 * independent providers.
 *
 * When the Bluetooth stack is ready to create an audio session, it must first
 * obtain the IBluetoothAudioProvider for that session type by calling
 * openProvider().
 *
 * Note: For HIDL APIs with a "generates" statement, the callback parameter used
 * for return value must be invoked synchronously before the API call returns.
 */
interface IBluetoothAudioProvidersFactory extends @2.1::IBluetoothAudioProvidersFactory {
    /**
     * Opens an audio provider for a session type. To close the provider, it is
     * necessary to release references to the returned provider object.
     *
     * @param sessionType The session type (e.g.
     *    LE_AUDIO_SOFTWARE_ENCODING_DATAPATH).
     *
     * @return status One of the following
     *    SUCCESS if the Audio HAL successfully opens the provider with the
     *        given session type
     *    FAILURE if the Audio HAL cannot open the provider
     * @return provider The provider of the specified session type
     */
    openProvider_2_2(SessionType sessionType)
        generates (Status status, IBluetoothAudioProvider provider);
};