如何使用 C# NAudio 操作字节？

Question

我目前能够：从音频输入中记录数据，在磁盘上使用该数据生成 wav 文件，从磁盘播放 wav。
我想完成的事情：获取通过 NAudio 读取的原始字节，将 wav、特定字节转换为 mp3，播放 mp3（不在磁盘上写入任何内容）。

使用的代码：

    public WaveIn waveSource = null;
    public WaveFileWriter waveFile = null;
    public List<byte> soundBytesList = new List<byte>();

    private void waveSource_DataAvailable(object sender, WaveInEventArgs e)
    {
        if (waveFile != null)
            for (int i = 0; i < e.BytesRecorded; ++i)
                soundBytesList.Add(e.Buffer[i]);
            waveFile.Write(e.Buffer, 0, e.BytesRecorded);
            waveFile.Flush();
    }

    public void waveSource_RecordingStopped(object sender, StoppedEventArgs e)
    {
        if (waveSource != null)
        {
            waveSource.Dispose();
            waveSource = null;
        }
        if (waveFile != null)
        {
            waveFile.Dispose();
            waveFile = null;
        }
    }

    private void RecordButton_MouseDown(object sender, EventArgs e)
    {
        waveSource = new WaveIn();
        waveSource.WaveFormat = new WaveFormat(44100, 1);

        waveSource.DataAvailable += new EventHandler<WaveInEventArgs>(waveSource_DataAvailable);
        waveSource.RecordingStopped += new EventHandler<StoppedEventArgs>(waveSource_RecordingStopped);

        waveFile = new WaveFileWriter("test.wav", waveSource.WaveFormat);

        waveSource.StartRecording();
    }

    private void RecordButton_MouseUp(object sender, EventArgs e)
    {
        waveSource.StopRecording();

        byte[] soundBytesArrayWAV = soundBytesList.ToArray();          
        byte[] outB = ConvertWavToMp3(soundBytesArrayWAV );
        File.WriteAllBytes("test.mp3", outB);
    }

        public byte[] ConvertWavToMp3(byte[] wavFile)
        {
            using (var retMs = new MemoryStream())
            using (var ms = new MemoryStream(wavFile))
            using (var rdr = new WaveFileReader(ms))
            using (var wtr = new LameMP3FileWriter(retMs, rdr.WaveFormat, 128))
            {
                rdr.CopyTo(wtr);
                wtr.Flush();
                return retMs.ToArray();
            }
        }

问题是我在 ConvertWavToMp3 方法上遇到错误，指出提供的字节数组 (soundBytesArrayWAV) 没有 RIFF（特定于 wav header）。我的猜测是我没有正确获取 soundBytesList 中的所有字节，因为如果我将所有字节加载到内存中（从写入 wav 的磁盘），转换工作正常。你能帮我一下吗？

Answer 1

根据@Jon Skeet建议更新的功能代码如下：

    public WaveIn waveSource = null;
    public WaveFileWriter waveFile = null;
    public MemoryStream memStream = null;

    private void waveSource_DataAvailable(object sender, WaveInEventArgs e)
    {
        if (waveFile != null)
        {
            waveFile.Write(e.Buffer, 0, e.BytesRecorded);
            waveFile.Flush();
        }
    }

    public void waveSource_RecordingStopped(object sender, StoppedEventArgs e)
    {
        if (waveSource != null)
        {
            waveSource.Dispose();
            waveSource = null;
        }
        if (waveFile != null)
        {
            waveFile.Dispose();
            waveFile = null;
        }
    }

    private void RecordButton_MouseDown(object sender, EventArgs e)
    {
        waveSource = new WaveIn();
        waveSource.WaveFormat = new WaveFormat(44100, 1);

        waveSource.DataAvailable += new EventHandler<WaveInEventArgs>(waveSource_DataAvailable);
        waveSource.RecordingStopped += new EventHandler<StoppedEventArgs>(waveSource_RecordingStopped);

        memStream = new MemoryStream();
        waveFile = new WaveFileWriter(memStream, waveSource.WaveFormat);

        waveSource.StartRecording();
    }

    private void RecordButton_MouseUp(object sender, EventArgs e)
    {
        waveSource.StopRecording();

        byte[] outB = memStream.ToArray();
        File.WriteAllBytes("test.mp3", outB);
    }

如何使用 C# NAudio 操作字节？

How to manipulate bytes with C# NAudio?

c#

c#-4.0

wav

naudio

lame