C# 使用Naudio播放文件时检测当前音量

所以我有

    IWavePlayer waveOutDevice;
    WaveStream mainOutputStream;
    WaveChannel32 volumeStream;

    private WaveStream CreateInputStream(string fileName)
    {
        WaveChannel32 inputStream;
        if (fileName.EndsWith(".mp3"))
        {
            WaveStream mp3Reader = new Mp3FileReader(fileName);
            inputStream = new WaveChannel32(mp3Reader);
        }
        else
        {
            throw new InvalidOperationException("Unsupported extension");
        }
        volumeStream = inputStream;
        return volumeStream;
    }

    private void Stop()
    {
        if (waveOutDevice != null)
        {
            waveOutDevice.Stop();
        }
        if (mainOutputStream != null)
        {
            // this one really closes the file and ACM conversion
            volumeStream.Close();
            volumeStream = null;
            // this one does the metering stream
            mainOutputStream.Close();
            mainOutputStream = null;
        }
        if (waveOutDevice != null)
        {
            waveOutDevice.Dispose();
            waveOutDevice = null;
        }
    }

    private void Play(string was)
    {
        waveOutDevice = new WaveOut();
        mainOutputStream = CreateInputStream(was);
        waveOutDevice.Init(mainOutputStream);
        waveOutDevice.Play();

    }

    private void Form1_Load(object sender, EventArgs e)
    {
        Play(@"E:\Eigene Audiodateien\Musik\Alben\Pur\Abenteuerland\ -  - .mp3");
    }

    private void button1_Click(object sender, EventArgs e)
    {
        Stop();
    }

有一个停止按钮（button1），用于停止播放。加载表单时，将播放文件。当文件播放时，我想通过运行函数获取文件的当前卷。那么像这样的函数在“…”上应该是什么样的呢

---

我不是说你可以用windows的声音控制来调节音量。我指的是当前播放的声音文件在当前播放位置的音量，它是基于字节[]数组之类的内容。

NAudioDemo演示了如何执行此操作。在

AudioPlaybackPanel.cs

中查看如何将

MeteringSampleProvider

添加到播放管道中

MeteringSampleProvider

将定期引发

StreamVolume

事件，告知您在过去100毫秒内收到的最大采样值（这是可配置的）。您需要决定是否要在任何软件音量调整之前或之后放置

MeteringSampleProvider

（对于波形绘制，通常在之前，对于音量测量，通常在之后）

下面是一个正在工作的WindowsForms演示，它将流卷写入控制台：

var player = new WaveOut();
var file = new AudioFileReader(@"test.mp3");
var meter = new MeteringSampleProvider(file);
meter.StreamVolume += (s,e) => Console.WriteLine("{0} - {1}", e.MaxSampleValues[0],e.MaxSampleValues[1]);
player.Init(new SampleToWaveProvider(meter));

var form = new Form();
form.Load += (s,e) => player.Play();
form.FormClosed += (s,e) => player.Dispose();
form.ShowDialog();

---

我根据您的回复创建了，但表单标题没有更改，即您的事件没有触发。您没有通过计量样本提供程序获取任何内容。我将用一个简短的演示更新我的答案

var player = new WaveOut();
var file = new AudioFileReader(@"test.mp3");
var meter = new MeteringSampleProvider(file);
meter.StreamVolume += (s,e) => Console.WriteLine("{0} - {1}", e.MaxSampleValues[0],e.MaxSampleValues[1]);
player.Init(new SampleToWaveProvider(meter));

var form = new Form();
form.Load += (s,e) => player.Play();
form.FormClosed += (s,e) => player.Dispose();
form.ShowDialog();