C# naudio从麦克风录制声音然后保存

naudio record sound from microphone then save

提问by Spencer

I'm having some issues with naudio and saving sound recordings. The code I currently have works to the point where it saves the wav file, but when I open it up, Windows Media Player returns an error: "Windows Media Player encountered a problem while playing the file"

我在 naudio 和保存录音方面遇到了一些问题。我目前拥有的代码可以保存 wav 文件，但是当我打开它时，Windows Media Player 返回一个错误：“Windows Media Player 在播放文件时遇到问题”

I have two buttons, a "Record" button, which turns into the stop button after it's pressed. And I have a "Save" button which when clicked, saves the recording to sample.wav.

我有两个按钮，一个“记录”按钮，按下后变成停止按钮。我有一个“保存”按钮，单击该按钮后，会将录音保存到sample.wav.

NAudio.Wave.WaveIn sourceStream = null;
NAudio.Wave.DirectSoundOut waveOut = null;
NAudio.Wave.WaveFileWriter waveWriter = null;

private void recordButton_Click(object sender, EventArgs e)
{
    int deviceNumber = sourceList.SelectedItems[0].Index;

    sourceStream = new NAudio.Wave.WaveIn();
    sourceStream.DeviceNumber = deviceNumber;
    sourceStream.WaveFormat = new NAudio.Wave.WaveFormat(44100, NAudio.Wave.WaveIn.GetCapabilities(deviceNumber).Channels);

    NAudio.Wave.WaveInProvider waveIn = new NAudio.Wave.WaveInProvider(sourceStream);

    waveOut = new NAudio.Wave.DirectSoundOut();
    waveOut.Init(waveIn);

    sourceStream.StartRecording();
    waveOut.Play();

    recordButton.Visible = false;
    stopRecord.Visible = true;
}

private void saveResponse_Click(object sender, EventArgs e)
{
    int deviceNumber = sourceList.SelectedItems[0].Index;

    string saveLocation = "c:\wav\sample.wav";

    sourceStream = new NAudio.Wave.WaveIn();
    sourceStream.DeviceNumber = deviceNumber;
    sourceStream.WaveFormat = new NAudio.Wave.WaveFormat(44100, NAudio.Wave.WaveIn.GetCapabilities(deviceNumber).Channels);

    sourceStream.DataAvailable += new EventHandler<NAudio.Wave.WaveInEventArgs>(sourceStream_DataAvailable);
    waveWriter = new NAudio.Wave.WaveFileWriter(saveLocation, sourceStream.WaveFormat);

    sourceStream.StartRecording();

    MessageBox.Show("Recording successfully saved.");
}

private void sourceStream_DataAvailable(object sender, NAudio.Wave.WaveInEventArgs e)
{
    if (waveWriter == null) return;

    waveWriter.WriteData(e.Buffer, 0, e.BytesRecorded);
    waveWriter.Flush();
}
private void stopRecord_Click(object sender, EventArgs e)
{
    if (waveOut != null)
    {
        waveOut.Stop();
        waveOut.Dispose();
        waveOut = null;
    }
    if (sourceStream != null)
    {
        sourceStream.StopRecording();
        sourceStream.Dispose();
        sourceStream = null;
    }
    if (waveWriter != null)
    {
        waveWriter.Dispose();
        waveWriter = null;
    }

    recordButton.Visible = true;
    stopRecord.Visible = false;
    saveResponse.Enabled = true;
}

采纳答案by Corey

Your recordButton_Clickcode isn't recording, it's piping data from a WaveInto a WaveOut, which will play the data coming from your source (microphone) directly to the output (speakers). It doesn't retain that data for later use, it just pipes it from one to the other. If you want to subsequently save that data to disk, you need to buffer it yourself.

您的recordButton_Click代码不是录音，而是将数据从 aWaveIn传输到 a WaveOut，这会将来自您的源（麦克风）的数据直接播放到输出（扬声器）。它不会保留这些数据供以后使用，它只是将它从一个管道传输到另一个。如果您想随后将该数据保存到磁盘，您需要自己缓冲它。

The saveResponse_Clickon the other hand is startingthe direct recording of data from the microphone to a wave file on disk. If you click your Save Responsebutton, wait for a bit, then click your Stopbutton, you should get a recorded wave file.

在saveResponse_Click另一方面是开始从麦克风到磁盘上的一个波形文件数据的直接记录。如果你点击你的Save Response按钮，稍等片刻，然后点击你的Stop按钮，你应该得到一个录制的波形文件。

If you want to record directly to disk, this is fine. If you want to record to memory, then optionally write to disk, then you need to save the data as it comes in. Perhaps use a memory stream to hold the data while recording, then write that to the WaveFileWriterwhen it comes time to save the file.

如果你想直接记录到磁盘，这很好。如果你想记录到内存，然后选择写入磁盘，那么你需要在数据进入时保存。也许在记录时使用内存流来保存数据，然后在需要WaveFileWriter时将其写入以保存数据文件。

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Here's the code I used for testing direct recording to a wave file on disk:

这是我用于测试直接录制到磁盘上的波形文件的代码：

public WaveIn waveSource = null;
public WaveFileWriter waveFile = null;

private void StartBtn_Click(object sender, EventArgs e)
{
    StartBtn.Enabled = false;
    StopBtn.Enabled = true;

    waveSource = new WaveIn();
    waveSource.WaveFormat = new WaveFormat(44100, 1);

    waveSource.DataAvailable += new EventHandler<WaveInEventArgs>(waveSource_DataAvailable);
    waveSource.RecordingStopped += new EventHandler<StoppedEventArgs>(waveSource_RecordingStopped);

    waveFile = new WaveFileWriter(@"C:\Temp\Test0001.wav", waveSource.WaveFormat);

    waveSource.StartRecording();
}

private void StopBtn_Click(object sender, EventArgs e)
{
    StopBtn.Enabled = false;

    waveSource.StopRecording();
}

void waveSource_DataAvailable(object sender, WaveInEventArgs e)
{
    if (waveFile != null)
    {
        waveFile.Write(e.Buffer, 0, e.BytesRecorded);
        waveFile.Flush();
    }
}

void waveSource_RecordingStopped(object sender, StoppedEventArgs e)
{
    if (waveSource != null)
    {
        waveSource.Dispose();
        waveSource = null;
    }

    if (waveFile != null)
    {
        waveFile.Dispose();
        waveFile = null;
    }

    StartBtn.Enabled = true;
}