问如何从扬声器录制音频？

EN

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