OpenMPT

OpenMPT was initially developed as a browser plug-in called MOD Plugin,[5] which enabled users to play music and other sounds encoded in module files. ModPlug Tracker, along with a player application named ModPlug Player, evolved from this plug-in.[6]

In December 1999, Olivier Lapicque sent the module-playing parts of ModPlug Tracker's source code to Kenton Varda, under the GPL, to write a plugin for XMMS based on the code. In 2001, the source code was released in the public domain,[1] and the mod-playing code was split off into a separate library, libmodplug, maintained as part of the ModPlug XMMS Plugin project. This project lay dormant from late 2003 until early 2006, when it was picked up again. Today, libmodplug is included in many Linux distributions as a default audio plugin for playing module files and is a part of the popular OpenSource multimedia framework gstreamer.[7]

Due to lack of time, Olivier Lapicque discontinued development of ModPlug Tracker itself, and in January 2004, he released the entire source code under an open-source license. The ModPlug Player source code is still closed as of May 2020.

Lapicque's MPT code was taken up by a group of tracker musicians/programmers and is now known as OpenMPT. Also based on the ModPlug code is OpenMPT's "sister project" Schism Tracker which contributed several backports of bugfixes to OpenMPT.[8]

OpenMPT is distributed as free software and is, as of May 2020, under active development. Until May 2009 (v1.17.02.53)[9] OpenMPT was licensed under the Copyleft GNU General Public License and then relicensed under the terms of the permissive BSD license. Since OpenMPT 1.23 (March 2014), OpenMPT is also available as a 64-bit application.[10] This allows musicians to use 64-bit VST plugins and make use of the entire physical memory on 64-bit systems. For this purpose, OpenMPT provides its own plugin bridge, which can be used to run plugins with a different bitness than the host in a separate process, or to run plugin in a sandbox and prevent them from crashing the host application.

Due to limitations of the various mod file formats it is able to save, a new module format called MPTM was created in 2007.[13] However, the format is still in experimental stage and is expected to be changed in the future.[14]

OpenMPT introduced some non-standard additions to the older file formats. For example, one can use stereo samples or add VST Plugins to XM and IT modules, which were not supported in the original trackers. Many of these features have gradually been removed from IT and XM files and made available only in MPTM files.

libopenmpt is a cross-platform module playing library based on the OpenMPT code with interfaces for C, C++ and other programming languages. To ensure that the code bases do not diverge like in the case of ModPlug Tracker and libmodplug, libopenmpt development takes place in the same code repository as OpenMPT. Official input plug-ins for popular audio players (XMPlay, Winamp and foobar2000) based on libopenmpt are also available from the website. FFmpeg also offers an optional module decoder based on libopenmpt.[15] libopenmpt can also serve as a drop-in replacement for libmodplug and thus offer up-to-date module playback capabilities for software that relies on the libmodplug API.[16]