用于NAudio录音的音频电平计

问题描述

我正在使用NAudio库将音频录制到WAV文件中.我希望能够在示例数据到达时将ProgressBar更新为音频电平/音量的值.

I´m recording audio to a WAV file using NAudio library. I want to be able to update a ProgressBar to the value of audio level/volume as the sample data arrives.

public WaveIn Recorder_NAudio;
public WaveFileWriter Writer_NAudio;

public void record()
{
        Recorder_NAudio = new WaveIn();
                Recorder_NAudio.WaveFormat = new NAudio.Wave.WaveFormat(sampleRate, 1);
                Writer_NAudio = new WaveFileWriter(File.Open(tempPath, FileMode.Create), Recorder_NAudio.WaveFormat);

                Recorder_NAudio.DataAvailable += new EventHandler<WaveInEventArgs>(Recorder2_DataAvailable);
                Recorder_NAudio.StartRecording();
}

void Recorder2_DataAvailable(object sender, WaveInEventArgs e)
{
     if (Writer_NAudio != null) if (Writer_NAudio.CanWrite)
     {
         Writer_NAudio.WriteData(e.Buffer, 0, e.BytesRecorded);

         // I need help to create this function
         ProgressBar1.value = GetVolumeFromBytes(e.buffer);
     }
}

推荐答案

对于Windows窗体示例，请查看NAudioDemo源代码，尤其是 AudioPlaybackPanel 类，该类使用MeteringSampleProvider并预订其StreamVolume事件以将属性设置为自定义音量计控件(包含在NAudio中)

For a Windows Forms example, have a look at the NAudioDemo source code and in particular the AudioPlaybackPanel class, which uses a MeteringSampleProvider and subscribes to its StreamVolume event to set the properties on a custom volume meter control (included in NAudio)

对于WPF示例，请查看 voicerecorder.codeplex.com ，它使用了类似的技术，音量计量为本文中所述.

For a WPF example, look at voicerecorder.codeplex.com which uses a similar technique and the volume metering is described in this article.

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