4

从我看到的使用 NAudio 的 MeteringSampleProvider 更新 VolumeMeter 控件的所有示例中，我认为我得到了正确的代码，但似乎 MeteringSampleProvider 和 SampleChannel 的事件永远不会触发。我正在同时写入一个 wav 文件，当我播放它时，录音工作正常。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();
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1 回答 1

3

您没有从 中读取meteringSampleProvider，因此不会引发任何事件。通常这当然是IWavePlayerthat is call Read，但如果您不播放音频，则需要以其他方式通过管道提取音频。

于 2012-03-28T12:25:11.507 回答