使用 NAudio 从麦克风录制声音。为啥不能正确地从列表中记录整个缓冲区？

Posted 2023-02-25

【中文标题】使用 NAudio 从麦克风录制声音。为啥不能正确地从列表中记录整个缓冲区？

【英文标题】：Record sound from microphone using NAudio. Why not works correctly record the whole buffer from the list?使用 NAudio 从麦克风录制声音。为什么不能正确地从列表中记录整个缓冲区？

【发布时间】：2017-03-20 11:53:55

【问题描述】：

一天中的好时光。请告诉我为什么 2 号代码不能正常工作？播放录制的文件时，您只会听到咔哒声。虽然代码 1（工作正常），但不同之处仅在于缓冲区不是立即写入文件，而是添加到列表中，然后从列表中记录整个缓冲区后写入文件。

№1

using NAudio.Wave;

namespace Record

    public partial class Form1 : Form
    
        public Form1()
        
            InitializeComponent();
        

        WaveIn waveIn;
        WaveFileWriter waveWriter;


        private void waveIn_DataAvailable(object sender, WaveInEventArgs e)
        
            if (waveWriter == null) return;

            waveWriter.Write(e.Buffer, 0, e.BytesRecorded);
            waveWriter.Flush();
        


        private void button1_Click(object sender, EventArgs e)
        
            waveIn = new WaveIn();
            waveIn.DeviceNumber = 0;
            string outputFilename = @"D:/demo.wav";
            waveIn.WaveFormat = new WaveFormat(44100, WaveIn.GetCapabilities(waveIn.DeviceNumber).Channels);

            waveIn.DataAvailable += new EventHandler<WaveInEventArgs>(waveIn_DataAvailable);
            waveWriter = new WaveFileWriter(outputFilename, waveIn.WaveFormat);
            waveIn.StartRecording();
        

        private void button2_Click(object sender, EventArgs e)
        

            if (waveIn != null)
            
                waveIn.StopRecording();
                waveIn.Dispose();
                waveIn = null;
            
            if (waveWriter != null)
            
                waveWriter.Dispose();
                waveWriter = null;
            
        
    

№2

using NAudio.Wave;

namespace RecordReally

    public partial class Form1 : Form
    
        public Form1()
        
            InitializeComponent();
        

        WaveIn waveIn;
        WaveFileWriter waveWriter;
        string outputFilename = @"D:/demo.wav";
        List<byte[]> bytes = new List<byte[]>();

        private void waveIn_DataAvailable(object sender, WaveInEventArgs e)
         
            bytes.Add(e.Buffer);
        

        private void button1_Click(object sender, EventArgs e)
        
            waveIn = new WaveIn();
            waveIn.DeviceNumber = 0;
            waveIn.WaveFormat = new WaveFormat(44100, WaveIn.GetCapabilities(waveIn.DeviceNumber).Channels);
            waveWriter = new WaveFileWriter(outputFilename, waveIn.WaveFormat);
            waveIn.DataAvailable += new EventHandler<WaveInEventArgs>(waveIn_DataAvailable);
            waveIn.StartRecording();
        

        private void button2_Click(object sender, EventArgs e)
        

            if (waveIn != null)
            
                waveIn.StopRecording();
                waveIn.Dispose();
                waveIn = null;
            
            foreach (byte[] buffer in bytes)
            
                waveWriter.Write(buffer, 0, buffer.Length);
                waveWriter.Flush();
            
            if (waveWriter != null)
            
                waveWriter.Dispose();
                waveWriter = null;
            
        
    

【问题讨论】：

bytes.Add(e.Buffer); 不复制字节。您需要创建一个新数组并将数据复制到新数组中，然后将新数组添加到列表中。

谢谢！作品）

【参考方案1】：

private void waveIn_DataAvailable(object sender, WaveInEventArgs e)

    byte[] ebuffer = new byte[e.BytesRecorded];
    for (int n = 0; n < ebuffer.Length; n++)
    
        ebuffer[n] = e.Buffer[n];
    
    bytes.Add(ebuffer);

【讨论】：

请添加详细信息以解释其工作原理或作用，以便于理解。