.Net 如何直接播放音频样本

Posted 2023-02-25

【中文标题】.Net 如何直接播放音频样本

【英文标题】：.Net How to play audio samples directly

【发布时间】：2012-12-19 18:43:58

【问题描述】：

我有通过 NAudio 提取的音频样本，我知道参数：

渠道 每个样本的字节数， 采样率

如何使用 .Net api / 或其他 .Net 库播放该示例

这里代码：

    openFileDialog1.ShowDialog();
    using (var reader = new Mp3FileReader(openFileDialog1.FileName))
    
        var pcmLength = (int)reader.Length;
        var _leftBuffer = new byte[pcmLength / 2];
        var buffer = new byte[pcmLength];
        var bytesRead = reader.Read(buffer, 0, pcmLength);
        int index = 0;
        for (int i = 0; i < bytesRead; i += 4)
        
           //extracting only left channel 
           _leftBuffer[index] = buffer[i];
           index++;
           _leftBuffer[index] = buffer[i + 1];
           index++;
         

         // How to play  _leftBuffer (Single channel, 2 bytes per sample, 44100 samples per secound)

【问题讨论】：

我对@9​​87654321@ 的回答将使用NAudio 播放文件。

【参考方案1】：

首先，您需要实现IWaveProvider 或使用NAudio 附带的IWaveProvider 实现之一，例如WaveProvider16。接下来，使用WaveOut.Init(IWaveProvider Provider) 使用IWaveProvider 初始化WaveOut 对象，最后调用WaveOut.Play()。

【参考方案2】：

是的，我找到了解决方案：A low-level audio player in C#

完整的工作代码：

public partial class Form1 : Form
    
        private byte[] _leftBuffer;
        private BiQuadFilter _leftFilter;
        private BiQuadFilter _rightFilter;
        public Form1()
        
            InitializeComponent();
        


        private void button1_Click(object sender, EventArgs e)
        
            openFileDialog1.ShowDialog();
            using (var reader = new Mp3FileReader(openFileDialog1.FileName))
            
                var pcmLength = (int)reader.Length;
                _leftBuffer = new byte[pcmLength / 2];
                var buffer = new byte[pcmLength];
                var bytesRead = reader.Read(buffer, 0, pcmLength);

                int index = 0;
                for (int i = 0; i < bytesRead; i += 4)
                
                    _leftBuffer[index] = buffer[i];
                    index++;
                    _leftBuffer[index] = buffer[i + 1];
                    index++;
                
                var player = new WaveLib.WaveOutPlayer(-1, new WaveLib.WaveFormat(44100, 16, 1), _leftBuffer.Length, 1, (data, size) =>
                                                                                                               
                                                                                                                   byte[] b = _leftBuffer;
                                                                                                                   System.Runtime.InteropServices.Marshal.Copy(b, 0, data, size);
                                                                                                               );