Acknowledgements

Built on other people's work.

Cog and XPCog play as much as they do because of the decoders, emulators, libraries and data below, and the people who wrote them. Each entry names its licence as the source trees state it — where they state one — and which of the two players uses it.

Decoders

Decoders and formats

AdPlug CogXPCog LGPL-2.1-or-later

Plays AdLib and OPL2 music
blip_buf CogXPCog LGPL-2.1-or-later

Band-limited synthesis for the Hively replayer and melonDS

© 2003–2009 Shay Green
bzip2 XPCog bzip2-1.0.6

Decompresses bzip2 archives for libarchive

© 1996–2019 Julian R Seward
C68K Cog GPL-2.0-or-later

Emulates the 68000 for HighlyTheoretical

© Stéphane Dallongeville
CELT 0.6.1 and 0.11.0 Cog BSD-3-Clause

Decodes FSB CELT for vgmstream

© Jean-Marc Valin, Timothy B. Terriberry, CSIRO
Chocolate Doom OPL music CogXPCog GPL-2.0-or-later

Drives the OPL3 for MIDI playback

© 1993–1996 Id Software, Inc.; © 2005–2014 Simon Howard
CVbriHeader Cog

Reads VBRI headers in MP3 files
Dolphin CogXPCog GPL-2.0-or-later

Provides JIT helpers inside melonDS
emu2413 Cog MIT

Emulates the YM2413 for Game Music Emu

© Mitsutaka Okazaki
FatFs CogXPCog FatFs licence (BSD-style)

Provides a FAT file system inside melonDS

© 2021 ChaN
FFmpeg CogXPCog LGPL-2.1-or-later

Decodes AAC, ALAC, WMA, AC-3, DTS and most container formats
File_Extractor Cog LGPL-2.1-or-later

Plays music straight out of archives

© Shay Green
Fraunhofer FDK AAC Cog FDK AAC licence

Decodes AAC for FFmpeg and vgmstream
G.719 reference code Cog

Decodes G.719 for vgmstream
Game Music Emu CogXPCog LGPL-2.1-or-later

Plays console chiptunes (NSF, SPC, GBS, VGM and more)
HighlyExperimental CogXPCog

Emulates the PlayStation for PSF and PSF2
HighlyQuixotic CogXPCog

Emulates Capcom QSound for QSF
HighlyTheoretical CogXPCog GPL-3.0

Emulates the Sega Saturn and Dreamcast for SSF and DSF
Hively replayer CogXPCog

Plays AHX and HivelyTracker modules
inih Cog BSD-3-Clause

Parses INI files inside mGBA

© Ben Hoyt
lazyusf2 CogXPCog GPL-2.0-or-later

Emulates the Nintendo 64 for USF
libarchive XPCog BSD-2-Clause

Plays music straight out of archives

© 2003–2010 Tim Kientzle
LibAtrac9 Cog MIT

Decodes ATRAC9 for vgmstream

© Alex Barney
libbinio CogXPCog LGPL-2.1-or-later

Reads files for AdPlug
libFLAC CogXPCog BSD-3-Clause

Decodes FLAC

© 2000–2009 Josh Coalson; © 2011–2025 Xiph.Org Foundation
libid3tag Cog GPL-2.0-or-later

Reads ID3 tags for the MP3 decoder

© Underbit Technologies
libogg CogXPCog BSD-3-Clause

Reads the Ogg container

© 2002 Xiph.Org Foundation
libopenmpt CogXPCog BSD-3-Clause

Plays tracker modules (MOD, S3M, XM, IT and more)

© 2004–2026 OpenMPT Project Developers and Contributors; © 1997–2003 Olivier Lapicque
libsidplayfp CogXPCog GPL-2.0-or-later

Plays Commodore 64 SID tunes
libvgm CogXPCog

Plays VGM, S98, DRO and GYM chip logs
libvorbis CogXPCog BSD-3-Clause

Decodes Ogg Vorbis

© 2002–2020 Xiph.Org Foundation
LZ4 XPCog BSD-2-Clause

Decompresses LZ4 archives for libarchive

© 2011–2020 Yann Collet
LZMA SDK (7z_C) Cog Public domain

Extracts 7-Zip archives
melonDS CogXPCog GPL-3.0-or-later

Emulates the Nintendo DS for 2SF

© 2016–2026 melonDS team
mGBA CogXPCog MPL-2.0

Plays GSF (Game Boy Advance) rips
minimp3 CogXPCog CC0-1.0

Decodes MP3
mpg123 CogXPCog LGPL-2.1-only

Decodes MP3 samples inside tracker modules and game streams

© 1995–2020 Michael Hipp and others
Musashi CogXPCog Musashi licence (free for non-commercial use)

Emulates the 68000 for HighlyTheoretical

© Karl Stenerud
Musepack decoder (libmpcdec) CogXPCog BSD-3-Clause

Decodes Musepack

© 2005 The Musepack Development Team
Nuked OPL3 CogXPCog GPL-2.0-or-later

Emulates the OPL3 for MIDI playback

© 2013–2016 Alexey Khokholov (Nuke.YKT)
Nuked SC-55 CogXPCog MAME licence (non-commercial)

Emulates the Roland SC-55

© 2021, 2024 nukeykt
Opus CogXPCog BSD-3-Clause

Decodes Opus

© 2001–2023 Xiph.Org, Skype Limited, Octasic and contributors
opusfile CogXPCog BSD-3-Clause

Reads Opus files

© 1994–2013 Xiph.Org Foundation and contributors
Organya player CogXPCog

Plays Cave Story's Organya music

Joel Yliluoma
psflib CogXPCog

Reads the PSF container
SFBAudioEngine Core Audio decoder Cog GPL-2.0-or-later

Decodes through Core Audio

© Stephen F. Booth
SHA-1 (Steve Reid) XPCog Public domain

Provides SHA-1 inside melonDS

By Steve Reid
Shorten Cog GPL-2.0 plus the Shorten licence (not to be sold without SoftSound's permission)

Decodes Shorten (.shn)
Snes9x CogXPCog Snes9x licence (non-commercial)

Emulates the Super Nintendo for SNSF

© 1996–2002 Gary Henderson and the Snes9x team
Snes9x APU CogXPCog LGPL-2.1

Emulates the SNES sound processor
Speex Cog BSD-3-Clause

Decodes Speex for vgmstream

© Jean-Marc Valin
SpessaSynth Core CogXPCog Apache-2.0

Synthesises MIDI with SoundFonts
SSEQPlayer CogXPCog

Plays NCSF (Nintendo DS SSEQ)

Naram Qashat (CyberBotX)
stb_vorbis Cog MIT OR Unlicense

Decodes Ogg-compressed SoundFont samples

© Sean Barrett
Syntrax (libjaytrax) CogXPCog GPL-3.0-only

Plays Syntrax modules

© Reinier van Vliet; © Christopher Snowhill
TagLib CogXPCog LGPL-2.1-only OR MPL-1.1

Reads tags
Teakra Cog MIT

Emulates the DSi DSP inside melonDS
tiny-AES-c CogXPCog Unlicense

Provides AES inside melonDS
UnRAR Cog UnRAR licence (freeware; may not be used to re-create RAR compression)

Extracts RAR archives
UTF8-CPP XPCog BSL-1.0

Converts text for TagLib
VBA-M Cog GPL-2.0-or-later

Emulates the Game Boy Advance for HighlyComplete
vgmstream CogXPCog ISC

Plays several hundred game audio stream formats

© 2008–2025 Adam Gashlin, Fastelbja, Ronny Elfert, bnnm and others
vorbis-tools picture code Cog GPL-2.0-or-later

Reads Vorbis cover art
WavPack CogXPCog BSD-3-Clause

Decodes WavPack

© 1998–2025 David Bryant
xxHash XPCog BSD-2-Clause

Provides hashing inside melonDS

© 2012–2023 Yann Collet
XZ Utils (liblzma) XPCog 0BSD

Decompresses XZ and LZMA archives for libarchive
Zstandard XPCog BSD-3-Clause

Decompresses Zstandard archives for libarchive

© Meta Platforms, Inc. and affiliates

Processing

Audio processing

DeaDBeeF FFT Cog Zlib

Provides the spectrum analyser's FFT

© Alexey Yakovenko
dsd2pcm XPCog BSD

Converts DSD to PCM

Sebastian Gesemann
FreeSurround CogXPCog GPL-2.0-or-later

Upmixes stereo to surround

© 2007–2010 Christian Kothe
HDCD decoder (hdcd_decode2) CogXPCog BSD-3-Clause

Decodes HDCD

© 2010–2023 Christopher Snowhill
HRTF (MinPHR) loader Cog

Loads HRTF data for headphone virtualisation
libsamplerate XPCog BSD-2-Clause

Resamples for Rubber Band

© 2012–2016 Erik de Castro Lopo
LPC extrapolation (lvqcl) CogXPCog ISC

Extrapolates gapless edges

© 2013, 2018 lvqcl
miniaudio XPCog Unlicense OR MIT-0

Plays audio to the output device

David Reid
Rubber Band Library CogXPCog GPL-2.0-or-later

Changes pitch and tempo independently
SFBAudioEngine Core Audio utilities Cog GPL-2.0-or-later

Helpers for Core Audio

© Stephen F. Booth
Signalsmith Linear CogXPCog MIT

Provides the FFT under Signalsmith Stretch

© 2025 Signalsmith Audio
Signalsmith Stretch CogXPCog MIT

Changes pitch and tempo independently

© 2022 Geraint Luff / Signalsmith Audio Ltd.
SLEEF XPCog BSL-1.0

Vector maths for Rubber Band
SoX Resampler (libsoxr) CogXPCog LGPL-2.1-or-later

Converts sample rates

© 2007–2018 robs@users.sourceforge.net

Interface

AVIFQuickLook decoder Cog

Decodes AVIF cover art
Crashpad XPCog Apache-2.0

Catches crashes for sentry-native
dav1d Cog

Decodes AV1 for libavif
GLib XPCog LGPL-2.1-or-later

D-Bus, media keys and notifications on Linux
GTK XPCog LGPL-2.1-or-later

Draws XPCog's interface on Linux
ImageTextCell Cog

Table cells with an icon
libadwaita XPCog LGPL-2.1-or-later

Draws XPCog's interface on Linux
libjpeg-turbo XPCog IJG AND BSD-3-Clause AND Zlib

Loads JPEG images for wxWidgets
libpng XPCog libpng-2.0

Loads PNG images for wxWidgets
libsecret XPCog LGPL-2.1-or-later

Keeps passwords in the system keyring on Linux
libyuv Cog

Converts colours for libavif
Logging.h Cog

Debug logging macros
MCP Swift SDK Cog Apache-2.0 AND MIT

The CogMCP server
OpenSSL XPCog Apache-2.0

Secures HTTPS for libcurl
PCRE2 XPCog BSD-3-Clause WITH PCRE2-exception

Regular expressions for wxWidgets
SQLite XPCog Public domain

Stores the music library
Swagger UI XPCog Apache-2.0

Shows the remote control's API documentation
wxWidgets XPCog LGPL-2.0-or-later WITH WxWindows-exception-3.1

Draws XPCog's interface on Windows

Data

AdPlug database CogXPCog Public domain

Per-song playback fixes for AdPlug
Commodore 64 ROMs CogXPCog

KERNAL, BASIC and character ROMs for SID playback

Commodore
GeneralUser GS CogXPCog GeneralUser GS License v2.0

The bundled General MIDI SoundFont

© 1997–2025 S. Christian Collins
GeneralUser XG (SFe test) CogXPCog GeneralUser GS License v2.0

The bundled XG SoundFont

© 2025–2026 SFe Team and contributors; portions © 1997–2026 S. Christian Collins
Organya wavetable and PixTone sounds CogXPCog

Instruments and drums for Organya music

Pixel (Daisuke Amaya)
PlayStation 2 BIOS sound modules CogXPCog

Runs PSF and PSF2 rips under HighlyExperimental

Sony
SADIE II HRTF (D02) Cog

Headphone impulse responses for HRTF
TG300B patch map CogXPCog

Maps TG300B patches to XG for the SFe bank
YRW801 sample ROM XPCog

The OPL4 wavetable, under libvgm

Yamaha