Manipulating mp3 files

[lonechicken]

There are a couple of free/share programs out there that can change the volume (mp3gain) or truncate (mptrim) without re-encoding mp3 files. Therefore, not affecting their quality. Anyway, I'm trying to figure out and learn how to do this myself in C# or VB.NET language but I haven't seen much help out there.

Do I start with figuring out winmm.dll? There only seems to be a bunch of wav and midi functions in that library.

 

[oppcos]

The most likely way the free programs are doing it is with the LAME MP3 encoder (available as a .dll so you can use with C#). There are some other options too, here are some links to get you started.

http://www.mp3dev.org/

http://www.mle.ie/~rob/mp3sharp/index.html

http://www.codeproject.com/cs/media/MP3Compressor.asp

 

[Nelviticus]

You can download the full source for MP3gain, so have a look at it's SourceForge site:

http://mp3gain.sourceforge.net/download.php

The bit you want is the C++ stuff at the bottom of the page. Although it's C++ you should still get some good pointers from it.

Nelviticus