MP3

Convert an MP3 to WAV

1) Add the using references for NAudio to your project:

using NAudio;
using NAudio.Wave;

2) Assuming that you are going to find the location of a MP3 and save the WAV file to the same location:

public static void Mp3ToWav(string mp3File, string outputFile)
{
    using (Mp3FileReader reader = new Mp3FileReader(mp3File))
    {
        WaveFileWriter.CreateWaveFile(outputFile, reader);
    }
}

3) You now have a WAV file in the directory of your MP3.

The complete sample program:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

using NAudio;
using NAudio.Wave;

namespace ConvertMP3toWAV
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void cmbOpen_Click(object sender, EventArgs e)
        {
            OpenFileDialog openFileDialog = new OpenFileDialog();
            openFileDialog.Filter = "MP3 Files (*.mp3)|*.mp3|All Files (*.*)|*.*";
            openFileDialog.FilterIndex = 1;
            if (openFileDialog.ShowDialog() == DialogResult.OK)
            {
                txtLocation.Text = openFileDialog.FileName;
            }
        }

        private void cmbConvert_Click(object sender, EventArgs e)
        {
            string outputFileName = txtLocation.Text;
            outputFileName = outputFileName.Substring(0, txtLocation.TextLength - 3) + "wav";
            Mp3ToWav(txtLocation.Text, outputFileName);
        }

        public static void Mp3ToWav(string mp3File, string outputFile)
        {
            using (Mp3FileReader reader = new Mp3FileReader(mp3File))
            {
                WaveFileWriter.CreateWaveFile(outputFile, reader);
            }
        }
    }
}