c# - NAudio MeteringSampleProvider无法触发事件吗？

从我使用NAudio的MeteringSampleProvider更新VolumeMeter控件看到的所有示例中，我认为我拥有正确的代码，但似乎MeteringSampleProvider以及SampleChannel的事件从未触发。我正在同时写入一个wav文件，当我播放它时，录音效果很好。有任何想法吗？

IWaveIn wavStream;
WaveFileWriter wavWriter;
BufferedWaveProvider bufferedWaveProvider;
SampleChannel sampleChannel;
MeteringSampleProvider meteringSampleProvider;

wavStream = new WaveIn();
wavWriter = new WaveFileWriter(CurrentRecording.Filename, wavStream.WaveFormat);

wavStream.DataAvailable += new EventHandler<WaveInEventArgs>((s2, e2) =>
{
  //Add sample to the buffered provider
  bufferedWaveProvider.AddSamples(e2.Buffer, 0, e2.BytesRecorded);

  //************************************************************
  //EDIT: This is how I solved the issue!!!
  var tmpBuffer = new float[e2.BytesRecorded];
  if (meteringSampleProvider != null)
    meteringSampleProvider.Read(tmpBuffer, 0, e2.BytesRecorded);
  //END EDIT
  //************************************************************

  //Write to the wave file
  wavWriter.Write(e2.Buffer, 0, e2.BytesRecorded);
});

//Create our Buffered provider
bufferedWaveProvider = new BufferedWaveProvider(wavStream.WaveFormat);
bufferedWaveProvider.DiscardOnBufferOverflow = true;

//Create the sample channel
sampleChannel = new SampleChannel(bufferedWaveProvider);
sampleChannel.PreVolumeMeter += new EventHandler<StreamVolumeEventArgs>((s2, e2) =>
{
  Console.WriteLine("PreVolumeMeter");
});

//Create the metering sample provider
meteringSampleProvider = new MeteringSampleProvider(sampleChannel);
meteringSampleProvider.StreamVolume += new EventHandler<StreamVolumeEventArgs>((s2, e2) =>
{
  Console.WriteLine("PostVolumeMeter");
});


//Start Recording
wavStream.StartRecording();

最佳答案

您不是从meteringSampleProvider中读取内容，因此不会引发任何事件。通常，正常情况下当然是调用IWavePlayer的Read，但是如果您不播放音频，则需要以其他方式将音频通过管道。