Merge MP3 files

readme.md

MergeMp3.exe

A very simple program using the nAudio library to merge multiple MP3s into a single MP3.

Usage: MergeMP3.exe "Input file pattern" "Output filename"

e.g.

MergeMP3.exe "*Track 1*" "Track 1 Merged.mp3"

Known limitations:

• The program works exclusively in the current working folder that it is launched in - attempting to provide a full path to the output/input files probably won't work. It's not hard to change though :)

Program.cs

namespace MergeMP3
{
    #region Using statements

    using System;
    using System.IO;

    using NAudio.Wave;

    #endregion

    public class Program
    {
        public static void Main(string[] args)
        {
            var dir = Directory.GetCurrentDirectory();
            var inputs = Directory.GetFiles(dir, args[0]);
            var output = Path.Combine(dir, args[1]);

            if (File.Exists(output))
            {
                throw new Exception("File exists.");
            }

            using (var fileStream = File.OpenWrite(output))
            {
                Combine(inputs, fileStream);
                fileStream.Flush();
            }
        }

        public static void Combine(string[] inputFiles, Stream output)
        {
            foreach (var file in inputFiles)
            {
                var reader = new Mp3FileReader(file);
                if ((output.Position == 0) && (reader.Id3v2Tag != null))
                {
                    output.Write(reader.Id3v2Tag.RawData, 0, reader.Id3v2Tag.RawData.Length);
                }

                Mp3Frame frame;
                while ((frame = reader.ReadNextFrame()) != null)
                {
                    output.Write(frame.RawData, 0, frame.RawData.Length);
                }
            }
        }
    }
}