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Editorial Team
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Asked: 2026-05-13T06:27:38+00:00

I’ve always been curious about audio conversion software, but I have never seen a

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I’ve always been curious about audio conversion software, but I have never seen a proper explanation from a beginners point of view as to how to write a simple program that converts for example, a mp3 file to a wav. I’m not asking about any of the complex algorithms involved, just a small example using a simple library. Searching on SO, I came up with several names including:

  • Lame
  • The Synthesis Toolkit
  • OpenAL
  • DirectSound

But I’m unable to find a straightforward example of any of these libraries. Usually I don’t mind wading through tons of code, but here I have absolutely no knowledge about the subject and so I always feel like I’m shooting in the dark.

Anyone here have a simple example / tutorial on converting a sound file using any of these libraries? My question is specifically directed towards C/C++ because those are the two languages I’m currently learning and so I’d like to continue to focus on them.

Edit: One thing I forgot to mention: I’m on a *NIX system.

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1 Answer

  1. Editorial Team

    Thanks everyone for the responses! I sort of cobbled them together to successfully make a small utility that converts a AIFF/WAV/etc file to an mp3 file. There seems to be some interest in this question, so here it what I did, step by step:

    Step 1:
    Download and install the libsndfile library as suggested by James Morris. This library is very easy to use – its only shortcoming is it won’t work with mp3 files.

    Step 2:
    Look inside the ‘examples’ folder that comes with libsndfile and find generate.c. This gives a nice working example of converting any non-mp3 file to various file formats. It also gives a glimpse of the power behind libsndfile.

    Step 3:
    Borrowing code from generate.c, I created a c file that just converts an audio file to a .wav file. Here is my code: http://pastie.org/719546

    Step 4:
    Download and install the LAME encoder. This will install both the libmp3lame library and the lame command-line utility.

    Step 5:
    Now you can peruse LAME’s API or just fork & exec a process to lame to convert your wav file to an mp3 file.

    Step 6: Bring out the champagne and caviar!

    If there is a better way (I’m sure there is) to do this, please let me know. I personally have never seen a step-by-step roadmap like this so I thought I’d put it out there.

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