Naudio实现声卡采集麦克风采集+混音

using NAudio.Wave;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Windows.Forms;

namespace ListenerMic
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        WasapiLoopbackCapture capture;

        private void Form1_Load(object sender, EventArgs e)
        {
              AudioMixer.AudioMixing("recorded.wav", "test.wav", "mixaudio.wav");
        }
        

        public void StartListener()
        {
            var outputFilePath = "recorded.wav";

            capture = new WasapiLoopbackCapture();
            var writer = new WaveFileWriter(outputFilePath, capture.WaveFormat);

            capture.DataAvailable += (s, a) =>
            {
                writer.Write(a.Buffer, 0, a.BytesRecorded);
            };
            capture.RecordingStopped += (s, a) =>
            {
                writer.Dispose();
                writer = null;
                capture.Dispose();
            };
            capture.StartRecording();
        }


        private IWaveIn waveIn;
        private WaveFileWriter writer;

        private WaveFileWriter sysWriter;
        /// <summary>
        /// 开始录音
        /// </summary>
        private void StartRecording()
        {
            if (waveIn != null) return;

            waveIn = new WaveIn { WaveFormat = new WaveFormat(48000, 1) };//设置码率

            writer = new WaveFileWriter("test.wav", waveIn.WaveFormat);
            waveIn.DataAvailable += waveIn_DataAvailable;

            waveIn.RecordingStopped += OnRecordingStopped;
            waveIn.StartRecording();
        }
        /// <summary>
        /// 停止录音
        /// </summary>
        private void StopRecording()
        {
            waveIn.StopRecording();
            waveIn.Dispose();
        }
        /// <summary>
        /// 录音中
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void waveIn_DataAvailable(object sender, WaveInEventArgs e)
        {
            if (this.InvokeRequired)
            {
                this.BeginInvoke(new EventHandler<WaveInEventArgs>(waveIn_DataAvailable), sender, e);
            }
            else
            {
                writer.Write(e.Buffer, 0, e.BytesRecorded);
                int secondsRecorded = (int)(writer.Length / writer.WaveFormat.AverageBytesPerSecond);//录音时间获取
                //if (secondsRecorded >= 30)
                //{
                //    StopRecording();
                //}

            }
        }
        /// <summary>
        /// 停止录音
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void OnRecordingStopped(object sender, StoppedEventArgs e)
        {
            if (this.InvokeRequired)
            {
                this.BeginInvoke(new EventHandler<StoppedEventArgs>(OnRecordingStopped), sender, e);
            }
            else
            {
                if (waveIn != null) // 关闭录音对象
                {
                    waveIn.Dispose();
                    waveIn = null;
                }
                if (writer != null)//关闭文件流
                {
                    writer.Close();
                    writer = null;
                }
                if (e.Exception != null)
                {
                    MessageBox.Show(String.Format("出现问题 {0}", e.Exception.Message));
                }
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            StartRecording();
            StartListener();

        }

        private void button2_Click(object sender, EventArgs e)
        {
            capture.StopRecording();
            StopRecording();
        }
    }

    }

using NAudio.Wave;
using NAudio.Wave.SampleProviders;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ListenerMic
{
    public class AudioMixer
    {
        /// <summary>
        /// 音频混合（混音）
        /// </summary>
        /// <param name="filePath1">音频文件路径</param>
        /// <param name="filePath2">音频文件路径</param>
        /// <param name="mixedPath">混合音频文件路径</param>
        public static void AudioMixing(string filePath1, string filePath2, string mixedPath)
        {
            using (var reader1 = new AudioFileReader(filePath1))
            using (var reader2 = new AudioFileReader(filePath2))
            {
                var mixer = new MixingSampleProvider(new[] { reader1, reader2 });
                WaveFileWriter.CreateWaveFile16(mixedPath, mixer);
            }
        }
    }
}