dispatchers_player_states.kt

interface SoundPlayer {
    suspend fun playSound()
}

sealed class PlayerState {
    object Stopped : PlayerState()
    object Playing : PlayerState()
}

class MediaPlayer(
    private val scope: CoroutineScope,
    private val soundPlayer: SoundPlayer
) {

    val playerState = MutableStateFlow<PlayerState>(PlayerState.Stopped)

    fun play() {
        scope.launch {
            playerState.emit(PlayerState.Playing)
            soundPlayer.playSound()
            playerState.emit(PlayerState.Stopped)
        }
    }

}