听到来自麦克风的传入音频

Question

我只想听听我使用 NAudio 对麦克风说的话，这是我目前的代码，但问题是我什么都听不到。任何帮助将不胜感激。

public partial class frmMain : Form
    {
        private WaveIn waveIn; // Gets an audio from microphone
        private WaveOut waveOut; // Sends audio to speaker
        private BufferedWaveProvider waveProvider; // Gets an audio from stream

        public frmMain()
        {
            InitializeComponent();
        }

        private void frmMain_Load(object sender, EventArgs e)
        {
            waveOut = new WaveOut();
            waveIn = new WaveIn();
            waveProvider = new BufferedWaveProvider(waveIn.WaveFormat);

            waveOut.Init(waveProvider);             

            waveIn.DataAvailable += waveIn_DataAvailable;

            waveOut.Play();            
        }

        private void waveIn_DataAvailable(object sender, WaveInEventArgs e)
        {
            waveProvider.Read(e.Buffer, 0, e.BytesRecorded);
        }

        private void btnStop_Click(object sender, EventArgs e)
        {
            waveIn.StopRecording();
            waveIn.Dispose();
        }

        private void btnStart_Click(object sender, EventArgs e)
        {
            waveIn.StartRecording();
        }
    }

我将在网络编程中使用这种场景，在该场景中，我将数据从麦克风发送到套接字，然后在客户端，BufferedWaveProvider 将读取数据，然后将其发送到扬声器。如果有更好的方法，请发表评论。

TIA

Answer 1

承诺的示例代码。代码用于具有两个按钮（名为 StartBtn 和 StopBtn）的表单。

public partial class Form1 : Form
{
    private WaveIn waveIn = null;
    private BufferedWaveProvider waveProvider = null;
    private WaveOut waveOut = null;

    public Form1()
    {
        InitializeComponent();
    }

    private void StartBtn_Click(object sender, EventArgs e)
    {
        if (waveIn != null)
            return;

        // create wave input from mic
        waveIn = new WaveIn(this.Handle);
        waveIn.BufferMilliseconds = 25;
        waveIn.RecordingStopped += waveIn_RecordingStopped;
        waveIn.DataAvailable += waveIn_DataAvailable;

        // create wave provider
        waveProvider = new BufferedWaveProvider(waveIn.WaveFormat);

        // create wave output to speakers
        waveOut = new WaveOut();
        waveOut.DesiredLatency = 100;
        waveOut.Init(waveProvider);
        waveOut.PlaybackStopped += wavePlayer_PlaybackStopped;

        // start recording and playback
        waveIn.StartRecording();
        waveOut.Play();
    }

    void waveIn_DataAvailable(object sender, WaveInEventArgs e)
    {
        // add received data to waveProvider buffer
        if (waveProvider != null)
            waveProvider.AddSamples(e.Buffer, 0, e.BytesRecorded);
    }

    private void StopBtn_Click(object sender, EventArgs e)
    {
        if (waveIn != null)
            waveIn.StopRecording();
    }

    void waveIn_RecordingStopped(object sender, StoppedEventArgs e)
    {
        // stop playback
        if (waveOut != null)
            waveOut.Stop();

        // dispose of wave input
        if (waveIn != null)
        {
            waveIn.Dispose();
            waveIn = null;
        }

        // drop wave provider
        waveProvider = null;
    }

    void wavePlayer_PlaybackStopped(object sender, StoppedEventArgs e)
    {
        // stop recording
        if (waveIn != null)
            waveIn.StopRecording();

        // dispose of wave output
        if (waveOut != null)
        {
            waveOut.Dispose();
            waveOut = null;
        }
    }
}

特别注意waveIn.BufferMilliseconds 和waveOut.DesiredLatency 设置以减少延迟时间。

为了压缩网络传输的数据，我建议使用不同的库来处理数据块。您可能需要调整 BufferMilliseconds 值以减少开销并获得更好的压缩比。

Opus Codec 看起来是一个合理的选择，Opus.NET 用于 C#。