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/*
* Copyright 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 com.example.minimaloboe
import androidx.lifecycle.DefaultLifecycleObserver
import androidx.lifecycle.LifecycleOwner
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.GlobalScope
import kotlinx.coroutines.Job
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.asStateFlow
import kotlinx.coroutines.flow.update
import kotlinx.coroutines.launch
import kotlinx.coroutines.plus
import kotlin.coroutines.CoroutineContext
object AudioPlayer : DefaultLifecycleObserver {
// Create a coroutine scope which we can launch coroutines from. This way, if our
// player is ever destroyed (for example, if it was no longer a singleton and had multiple
// instances) any jobs would also be cancelled.
private val coroutineScope = CoroutineScope(Dispatchers.Default) + Job()
private var _playerState = MutableStateFlow<PlayerState>(PlayerState.NoResultYet)
val playerState = _playerState.asStateFlow()
init {
// Load the library containing the native code including the JNI functions.
System.loadLibrary("minimaloboe")
}
fun setPlaybackEnabled(isEnabled: Boolean) {
// Start (and stop) Oboe from a coroutine in case it blocks for too long.
// If the AudioServer has died it may take several seconds to recover.
// That can cause an ANR if we are starting audio from the main UI thread.
coroutineScope.launch {
val result = if (isEnabled) {
startAudioStreamNative()
} else {
stopAudioStreamNative()
}
val newUiState = if (result == 0) {
if (isEnabled){
PlayerState.Started
} else {
PlayerState.Stopped
}
} else {
PlayerState.Unknown(result)
}
_playerState.update { newUiState }
}
}
override fun onStop(owner: LifecycleOwner) {
setPlaybackEnabled(false)
super.onStop(owner)
}
private external fun startAudioStreamNative(): Int
private external fun stopAudioStreamNative(): Int
}
sealed interface PlayerState {
object NoResultYet : PlayerState
object Started : PlayerState
object Stopped : PlayerState
data class Unknown(val resultCode: Int) : PlayerState
}
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