Merge "[Audiosharing] Add ext class for callback flow of fallback group change" into main

/*

 * Copyright (C) 2025 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.settingslib.bluetooth

import android.bluetooth.BluetoothDevice

import android.bluetooth.BluetoothLeAudio

import android.bluetooth.BluetoothLeAudioCodecStatus

import com.android.internal.util.ConcurrentUtils

import kotlinx.coroutines.channels.Channel

import kotlinx.coroutines.channels.awaitClose

import kotlinx.coroutines.flow.Flow

import kotlinx.coroutines.flow.buffer

import kotlinx.coroutines.flow.callbackFlow

/** [Flow] for [BluetoothLeAudio.Callback] fallback group change events */

val LeAudioProfile.onBroadcastToUnicastFallbackGroupChanged: Flow<Int>

    get() =

        callbackFlow {

            val listener =

                object : BluetoothLeAudio.Callback {

                    override fun onCodecConfigChanged(p0: Int, p1: BluetoothLeAudioCodecStatus) {

                    }

                    override fun onGroupNodeAdded(p0: BluetoothDevice, p1: Int) {

                    }

                    override fun onGroupNodeRemoved(p0: BluetoothDevice, p1: Int) {

                    }

                    override fun onGroupStatusChanged(p0: Int, p1: Int) {

                    }

                    override fun onBroadcastToUnicastFallbackGroupChanged(arg1: Int) {

                        trySend(arg1)

                    }

                }

            registerCallback(

                ConcurrentUtils.DIRECT_EXECUTOR,

                listener,

            )

            awaitClose { unregisterCallback(listener) }

        }

            .buffer(capacity = Channel.CONFLATED)

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