WaveOutEvent initialized with AudioFileReader (MP3, WAV) - playback speed too fast and popping artifacts

[smougie]

Hello,

I'm trying to output one audio file loaded from streamingAssets directory in Unity to all available output devices. I was able to loop the file and pass audio to all output devices but I've got some issues with sound quality:

1. Audio playback speed seems to be at least twice times faster (or even faster) than when I just open in external software
2. Audio is playing with some constant "popping" sound in background

My code:

public class DistortionSoundController : MonoBehaviour
{
    private AudioFileReader _audioFileReader;
    private readonly List<WaveOutEvent> _outputs = new();
    public bool InitFinished { get; private set; }
    private bool _isPlaying;

    public void Init(string pathToAudioFileInStreamingAssets, IEnumerable<int> outputDevicesIndexes)
    {
        string fullAudioFilePath = Path.Combine(FileLocation.StreamingAssets.GetPath(), pathToAudioFileInStreamingAssets);
        if (!DirectoryService.FileExists(pathToAudioFileInStreamingAssets, FileLocation.StreamingAssets))
        {
            throw new FileNotFoundException($"Provided distortion audio file doesn't exist.\nPath from config JSON: {pathToAudioFileInStreamingAssets}\nFull path: {fullAudioFilePath}");
        }

        _audioFileReader = new AudioFileReader(fullAudioFilePath);
        
        foreach (int outputIndex in outputDevicesIndexes)
        {
            var output = new WaveOutEvent { DeviceNumber = outputIndex };
            output.Init(_audioFileReader);

            _outputs.Add(output);
        }
        

        InitFinished = true;
    }

    public void Play()
    {
        if (!InitFinished)
            throw new Exception($"Tried to use {nameof(DistortionSoundController)} before initializing it!");

        if (_isPlaying) return;

        foreach (var output in _outputs)
            output.Play();
        _isPlaying = true;
    }

    public void Stop()
    {
        if (!InitFinished)
            throw new Exception($"Tried to use {nameof(DistortionSoundController)} before initializing it!");

        if (!_isPlaying) return;

        foreach (var output in _outputs)
            output.Stop();

        _audioFileReader.Position = 0;
        _isPlaying = false;
    }

    public void OnApplicationQuit()
    {
        foreach (var output in _outputs)
        {
            output?.Stop();
            output?.Dispose();
        }
        
        _audioFileReader?.Dispose();
    }

    private void Update()
    {
        if (!_isPlaying) return;

        bool reachedFileEnd = _audioFileReader.Position >= _audioFileReader.Length;

        if (reachedFileEnd)
            _audioFileReader.Position = 0;
    }
}