Naudio-播放双阵列

Question

我对 c# 很陌生，我一直在尝试编写一个程序来录制声音、显示它的波形、修改它并实时播放它。绘图效果很好，因为我使用了互联网上的一些示例，但我无法正确播放。我一直在尝试将 "WaveOut" 与转换为字节的双数组一起使用，但它给了我一些可怕的噪音，但我想我可以从我的输入中听到一些东西。提前致谢！

以下是代码中最重要的部分：

（Ys2 是带有样本的双精度数组）

    static byte[] GetBytesAlt(double[] values)
    {
        var result = new byte[values.Length * sizeof(double)];
        Buffer.BlockCopy(values, 0, result, 0, result.Length);
        return result;
    }
    public void UpdateAudioGraph()
    {
    [.....]
        WaveOut wo = new WaveOut();
        byte[] Ys3 = GetBytesAlt(Ys2);
        IWaveProvider provider = new RawSourceWaveStream(
                     new MemoryStream(Ys3), new WaveFormat());


       wo.Init(provider);
       wo.Play();
    [.....] 
    }
    private void timer1_Tick(object sender, EventArgs e)
    {
        UpdateAudioGraph();
    }

*编辑

我设法做到了。仍然有一些回声，但效果很好。结果如下：

public partial class Form1 : Form
{
    static WaveFormat waveFormat;
    static int bufferMilliseconds;
    static int x = 0;
    public WaveIn wi;
    public BufferedWaveProvider bwp;
    public BufferedWaveProvider provider;
    public Int32 envelopeMax;
    public IWavePlayer wo;

    double cutoff = 10000;
    private int RATE = 44100; // sample rate of the sound card
    private int BUFFERSIZE = (int)Math.Pow(2, 16); // must be a multiple of 2
    //private int BUFFERSIZE = 44100;
    public byte[] frames;



    public Form1()
    {
        InitializeComponent();

        // see what audio devices are available
        int devcount = WaveIn.DeviceCount;
        Console.Out.WriteLine("Device Count: {0}.", devcount);

        //waveFormat = new NAudio.Wave.WaveFormat.(RATE, 1);
        waveFormat = WaveFormat.CreateIeeeFloatWaveFormat(RATE, 1);
        bufferMilliseconds = (int)((double)BUFFERSIZE / (double)RATE * 1000.0);

        // get the WaveIn class started
        WaveIn wi = new WaveIn();
        wi.DeviceNumber = 0;
        wi.WaveFormat = waveFormat;
        wi.BufferMilliseconds = bufferMilliseconds;
        // create a wave buffer and start the recording
        wo = new DirectSoundOut();
        wi.DataAvailable += new EventHandler<WaveInEventArgs>(wi_DataAvailable);
        bwp = new BufferedWaveProvider(waveFormat);
        bwp.BufferLength = BUFFERSIZE * 8;
        bwp.DiscardOnBufferOverflow = true;
        wi.StartRecording();
        wo.Init(bwp);
        wo.Play();
    }

    // adds data to the audio recording buffer
    void wi_DataAvailable(object sender, WaveInEventArgs e)
    {
        int size = e.BytesRecorded;
        label3.Text = size.ToString();
        frames = new byte[size];
        e.Buffer.CopyTo(frames, 0);

        float[] values = new float[size / 4];
        for (int i = 0; i < values.Length; i++)
        { 
            values[i] = BitConverter.ToSingle(frames, i * 4);
        }

        double[] doubleArray = Array.ConvertAll(values, x => (double)x);
        doubleArray = Butterworth(doubleArray,cutoff);
        values = Array.ConvertAll(doubleArray, y => (float)y);
        frames = values.SelectMany(value => BitConverter.GetBytes(value)).ToArray();

        x++;
        label2.Text = x.ToString();
        label1.Text = timer2.Interval.ToString();

        bwp.AddSamples(frames, 0, size);
    }

Answer 1

您提供的是双声道音频（大概是单声道），但播放代码需要 16 位立体声音频。如果您可以将音频作为 float 提供，那么您可以在构造函数中使用 WaveFormat.CreateIeeeFloatWaveFormat(44100,1)（具有正确的音频采样率和通道数）到 RawSourceWaveStream

Naudio-播放双阵列

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