如何录制扬声器的音频？

Posted 2023-02-22

【中文标题】如何录制扬声器的音频？

【英文标题】：How do I record audio from speakers?

【发布时间】：2016-05-07 06:03:50

【问题描述】：

Imports NAudio
Imports System.IO
Imports NAudio.Utils

Public Class Form1
    Private waveSource As Wave.WaveIn = Nothing
    Private waveFile As Wave.WaveFileWriter = Nothing
    Private waveFileWriter As Wave.WaveFileWriter
    Dim ms As MemoryStream

    Private Sub waveSource_DataAvailable(ByVal sender As Object, ByVal e As Wave.WaveInEventArgs)
        waveFileWriter.Write(e.Buffer, 0, e.BytesRecorded)
        waveFileWriter.Flush()
    End Sub

    Private Sub waveSource_RecordingStopped(ByVal sender As Object, ByVal e As Wave.StoppedEventArgs)
        Dim fs As FileStream = File.Create(Environment.CurrentDirectory & "\test.wav")
        ms.Seek(0, SeekOrigin.Begin)
        ms.CopyTo(fs)
    End Sub

    Private Sub startBTN_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles startBTN.Click
        ms = New MemoryStream()

        waveFileWriter = New Wave.WaveFileWriter(New IgnoreDisposeStream(ms), waveSource.WaveFormat)
        waveSource.StartRecording()
    End Sub

    Private Sub stopBTN_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles stopBTN.Click
        waveSource.StopRecording()
    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        waveSource = New Wave.WaveIn

        AddHandler waveSource.DataAvailable, AddressOf waveSource_DataAvailable
        AddHandler waveSource.RecordingStopped, AddressOf waveSource_RecordingStopped
    End Sub
End Class

翻译以下帖子中的代码，这会引发“Bad Device ID”异常。

Naudio Recording and playing audio

我没有任何录音设备（或 WaveIn）。是这个原因吗？

【参考方案1】：

是的。 NAudio 是开源的。您可以调试它并自己发现它。

调查 WASAPI 捕获。我不知道这是否可行，但这是下一步。

【参考方案2】：

C# how to record general audio from output device ( speaker ) with NAudio API

    Private waveSource As Wave.WasapiLoopbackCapture = Nothing

将Wave.WaveIn 更改为Wave.WasapiLoopbackCapture 解决了我的问题。当然，我的代码仍然存在问题（请注意）。点击停止会停止捕获但不写入文件。只有在您强制退出应用程序之前，.wav 才会保存到磁盘。我可以自己解决。

【参考方案3】：

将此添加到Private Sub waveSource_RecordingStopped 以在不关闭应用程序的情况下查看.wav：

fs.Dispose()