如何从扬声器录制音频？

Question

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 

翻译下面的帖子中的代码，这会抛出“坏设备ID”异常。

Naudio Recording and playing audio

我没有任何录音设备（或WaveIn）。那是为什么？

Answer 1

是的。 NAudio是开源的。你可以调试它并为你自己发现。

调查WASAPI捕获。我不知道这是否可行，但这是下一步。

Answer 2

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

Private waveSource As Wave.WasapiLoopbackCapture = Nothing 

更改Wave.WaveIn到Wave.WasapiLoopbackCapture解决了我的问题。当然，我的代码仍然存在问题（请注意）。点击停止停止捕获，但不写入文件。直到您强制退出应用程序，.wav才会保存到磁盘。我可以自己解决这个问题。