写入文件时压缩音频

Question

我正在尝试从声卡发出的音频创建一个录音机，这是我迄今为止的进展，问题是保存到文件时录制的音频太大，就像一首歌曲可以达到数百兆字节。

这是我的代码

using NAudio.CoreAudioApi;
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.Tasks;
using System.Windows.Forms;

namespace Record_From_Soundcard
{
    public partial class frmMain : Form
    {
        private WaveFileWriter writer;
        private WasapiLoopbackCapture waveInSel;

        public frmMain()
        {
            InitializeComponent();
        }

        private void frmMain_Load(object sender, EventArgs e)
        {
            MMDeviceEnumerator deviceEnum = new MMDeviceEnumerator();
            MMDeviceCollection deviceCol = deviceEnum.EnumerateAudioEndPoints(DataFlow.Render, DeviceState.Active);

            cboAudioDrivers.DataSource = deviceCol.ToList();
        }       

        private void btnStopRecord_Click(object sender, EventArgs e)
        {
            waveInSel.StopRecording();
            writer.Close();
        }        

        private void btnStartRecord_Click(object sender, EventArgs e)
        {
            using (SaveFileDialog _sfd = new SaveFileDialog())
            {
                _sfd.Filter = "Mp3 File (*.mp3)|*.mp3";               

                if (_sfd.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                {
                    MMDevice _device = (MMDevice)cboAudioDrivers.SelectedItem;
                    waveInSel = new WasapiLoopbackCapture(_device);
                    writer = new WaveFileWriter(_sfd.FileName, waveInSel.WaveFormat);                    

                    waveInSel.DataAvailable += (n, m) =>
                    {
                        writer.Write(m.Buffer, 0, m.BytesRecorded);
                    };

                    waveInSel.StartRecording();
                }
            }
        }
    }

}

谁能帮助我在保存时如何压缩音频？

可能会在这部分添加

waveInSel.DataAvailable += (n, m) =>
    {
         writer.Write(m.Buffer, 0, m.BytesRecorded);
    };

提前谢谢.. ;)

Answer 1

使用 naudio dll 试试这个

Using NAudio.Wave; Using NAudio.Wave.SampleProviders;Using NAudio.Lame
Private void WaveToMP3(int bitRate = 128){
    String waveFileName = Application.StartupPath + @"\Temporal\mix.wav";
    String mp3FileName = Application.StartupPath + @"\Grabaciones\ " + Strings.Format(DateTime.Now, "dd-MM-yyyy.HH.mm.ss") + ".mp3";

    Using (var reader = New AudioFileReader(waveFileName))
    {
        Using (var writer = New LameMP3FileWriter(mp3FileName, reader.WaveFormat, bitRate))
        {
            reader.CopyTo(writer);
        }
        reader.Close();
    }
}

Answer 2

您不能通过保存扩展名为 .MP3 的 WAV 文件来制作 MP3 文件（这就是您在此处所做的）。您需要选择机器上可用的编码器，然后通过它传递音频。我在this article 中详细介绍了如何使用 NAudio 执行此操作。