NAudio体积变化

Question

class Sound
{

    private NAudio.Wave.BlockAlignReductionStream stream = null;
    private NAudio.Wave.DirectSoundOut output = null;
    private string fileName;

    public Sound(string fileName)
    {

        this.fileName = fileName;

    }
    public void PlaySound()
    {

        if(fileName.EndsWith(".mp3"))
        {
        NAudio.Wave.WaveStream pcm = NAudio.Wave.WaveFormatConversionStream.CreatePcmStream(new NAudio.Wave.Mp3FileReader(fileName));
        stream = new NAudio.Wave.BlockAlignReductionStream(pcm);

        }
        else if (fileName.EndsWith(".wav"))
        {
            NAudio.Wave.WaveStream pcm = new NAudio.Wave.WaveChannel32(new NAudio.Wave.WaveFileReader(fileName));
            stream = new NAudio.Wave.BlockAlignReductionStream(pcm);
        }
        else throw new InvalidOperationException("Not a correct audio file type.");

        output = new NAudio.Wave.DirectSoundOut();
        output.Init(stream);
        output.Play();
        output.Volume = 0.5f;
    }
    public void Volume(float vol)
    {

    }
    public void PausePlay()
    {
        if (output != null)
        {
            if (output.PlaybackState == NAudio.Wave.PlaybackState.Playing) output.Pause();
            else if (output.PlaybackState == NAudio.Wave.PlaybackState.Paused) output.Play();
        }
    }
    public void Pause()
    {
        if (output != null)
        {
            if (output.PlaybackState == NAudio.Wave.PlaybackState.Playing) output.Pause();
        }
    }
    public void Play()
    {
        if (output != null)
        {
            if (output.PlaybackState == NAudio.Wave.PlaybackState.Paused) output.Play();
        }
    }
    public void DisposeWave()
    {
        if (output != null)
        {
            if (output.PlaybackState == NAudio.Wave.PlaybackState.Playing) output.Stop();
            output.Dispose();
            output = null;
        }
        if (stream != null)
        {
            stream.Dispose();
            stream = null;
        }
    }
    public bool Over()
    {
        if (stream.Position == stream.Length)
            return true;
        return false;
    }
    public void Loop()
    {

        if (Over())
        {
            stream.Position = 0;
            output.Play();

        }

    }

我真的不知道这里有什么问题，我很乐意帮忙，我正试图改变输出音频的音量。当我编译这段代码时，我在output.volume = 0.5中得到了一个错误。错误是：

设置卷不受DirectSoundOut支持，请调整WaveProvider上的卷。

Answer 1

这意味着，在WaveChannel32上使用WaveChannel32属性。另外，除非您使用的是旧版本的NAudio，否则不需要使用BlockAlignReductionStream和WaveFormatConversion流，因为MP3FileReader会发出PCM。