c# - 用于 NAudio 录音的音频电平表

Question

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

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);
     }
}

Answer 1

对于 Windows 窗体示例，请查看 NAudioDemo 源代码，特别是 AudioPlaybackPanel类，它使用 MeteringSampleProvider 并订阅其 StreamVolume 事件以设置自定义音量计控件(包含在 NAudio 中)的属性

有关 WPF 示例，请查看 voicerecorder.codeplex.com它使用了类似的技术，音量计量在 this article 中有所描述。 .