Fully managed, portable and easy-to-use C# library to read and edit audio data and metadata (tags) from various audio formats, playlists and CUE sheets
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Audio Tools Library (ATL) for .NET NetCore NetStandard Net Framework

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What is ATL .NET ?

Audio Tools Library .NET is the C# port of the original ATL, written in Pascal by the MAC Team (Jürgen Faul, Gambit and contributors).

It is aimed at giving C# developers a native, portable and easy-to-use library to access and read data from various digital audio formats.

As a showcase, I have used ATL.NET as a cornerstone to build Ethos Cataloger, a digital music cataloging software written entirely in C#.

What is NOT ATL .NET ?

Audio Tools Library .NET is not

  • a standalone application : it is a library aimed at being used by developers to build software

  • an audio music player : it gives access to various properties and metadata (see below for the comprehensive list), but does not process audio data into an audible signal

Why open source ?

ATL has been open source since its creation. The ATL 2.3 source written in Pascal language is still out there on Sourceforge !

By publicly sharing the result of their work, the MAC team has helped many developers to gain tremendous time in creating audio tools.

As a fellow audiophile and developer, I'm proudly extending and improving their initial contribution to the open source community.

Why would I want to use ATL while TagLib is out there ?

  • ATL is a fully native C# implementation, which makes portability trivial if your app is already based on .NET or Mono frameworks

  • ATL features a flexible logging system which allows you to catch and record audio file reading/writing incidents into your app

  • ATL supports more audio formats than TagLib, including video game audio formats (SPC, PSF, VGM, GYM)

  • ATL supports chapters natively

  • ATL supports BEXT, LIST INFO and iXML metadata in RIFF / WAV files

  • ATL supports Playlists and Cuesheets

How to use it ? Which platforms and .NET/Mono versions does ATL run on ?

The ATL library runs on .NET Core 2.0+ / .NET Standard 2.0+ / .NET Framework 3.0+ / Mono 2.0+

ATL unit tests run on .NET Framework 4.5+

The library and its tests have been maintained on Visual Studio Express 2012, 2015 and 2017 Community

Please refer to the Code snippets section of the Documentation for quick usage

What kind of data can ATL actually read ? From which formats ?


NB1 : Empty cells mean "not applicable for this audio format"

NB2 : All metadata is read according to Unicode/UTF-8 encoding when applicable, which means any "foreign" character (japanese, chinese, cyrillic...) will be recognized and displayed properly

R= Read / W= Write

Audio format Extensions ID3v1.0-1.1 support ID3v2.2-2.4 support (1) APEtag 1.0-2.0 support Format-specific tagging support
Advanced Audio Coding, Apple Lossless (ALAC) .AAC, .MP4, .M4A R/W R/W R/W R/W
Audio Interchange File Format .AIF, .AIFF, .AIFC R/W R/W
Digital Theatre System .DTS
Direct Stream Digital .DSD, .DSF R/W
Dolby Digital .AC3 R/W
Extended Module .XM R/W (2)
Free Lossless Audio Codec .FLAC R/W R/W
Genesis YM2612 .GYM R/W
Impulse Tracker .IT R/W (2)
Musical Instruments Digital Interface .MID, .MIDI R/W (3)
Monkey's Audio .APE R/W R/W R/W
MPEG Audio Layer .MP1, .MP2, .MP3 R/W R/W R/W
MusePack / MPEGplus .MPC, .MP+ R/W R/W R/W
Noisetracker/Soundtracker/Protracker .MOD R/W (2)
OGG : Vorbis, Opus .OGG, .OPUS R/W
ScreamTracker .S3M R/W (2)
SPC700 (Super Nintendo Sound files) .SPC R/W
Toms' losslesss Audio Kompressor .TAK R/W
True Audio .TTA R/W R/W R/W
PCM (uncompressed audio) .WAV, .BWAV, .BWF R/W R/W R/W (4)
Video Game Music (SEGA systems sound files) .VGM, .VGZ R/W
WavPack .WV R/W
Windows Media Audio/Advanced Systems Format .WMA, .ASF R/W

(1) : ATL reads ID3v2.2-2.4 tags, but only writes ID3v2.4 tags

(2) : all sample names appear on the track's Comment field. Track title only is editable

(3) : MIDI meta events appear on the track's Comment field

(4) : Support for BEXT, LIST INFO and iXML chunks


  • Audio data (from audio data) : Bitrate, Sample rate, Duration, VBR, Codec family
  • Standard Metadata (from tags) : Title, Artist, Album Artist, Composer, Conductor, Description, Comment, Genre, Track number, Disc number, Year, Album, Rating, Publisher, Copyright, Original album, Original artist, Embedded pictures, Chapters
  • Custom Metadata : any other field that might be in the tag is readable and editable by ATL

SUPPORTED PLAYLISTS FORMATS : ASX, B4S, FPL (experimental), M3U, M3U8, PLS, SMIL (including WPL and ZPL), XSPF


What is the roadmap of ATL.NET ?

  • Support for Broadcast wave metadata : aXML and XMP
  • Support for other audio file formats : Speex, Theora, Audible
  • Connectors to other library file formats (e.g. iTunes)

Does ATL.NET include code authored by other people ?

ATL.NET is based on :

  • Audio Tools Library 2.3 by Jurgen Faul, Mattias Dahlberg, Gambit, MaDah and Erik Stenborg (code ported from Pascal to C# and refactored)

  • MIDI class 1.5 by Valentin Schmidt & Michael Mlivoncic (code ported from PHP to C# and refactored)