CogCog
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

  • AdPlugCogXPCogLGPL-2.1-or-later
    Plays AdLib and OPL2 music
  • blip_bufCogXPCogLGPL-2.1-or-later
    Band-limited synthesis for the Hively replayer and melonDS
    © 2003–2009 Shay Green
  • bzip2XPCogbzip2-1.0.6
    Decompresses bzip2 archives for libarchive
    © 1996–2019 Julian R Seward
  • C68KCogGPL-2.0-or-later
    Emulates the 68000 for HighlyTheoretical
    © Stéphane Dallongeville
  • CELT 0.6.1 and 0.11.0CogBSD-3-Clause
    Decodes FSB CELT for vgmstream
    © Jean-Marc Valin, Timothy B. Terriberry, CSIRO
  • Chocolate Doom OPL musicCogXPCogGPL-2.0-or-later
    Drives the OPL3 for MIDI playback
    © 1993–1996 Id Software, Inc.; © 2005–2014 Simon Howard
  • CVbriHeaderCog
    Reads VBRI headers in MP3 files
  • DolphinCogXPCogGPL-2.0-or-later
    Provides JIT helpers inside melonDS
  • emu2413CogMIT
    Emulates the YM2413 for Game Music Emu
    © Mitsutaka Okazaki
  • FatFsCogXPCogFatFs licence (BSD-style)
    Provides a FAT file system inside melonDS
    © 2021 ChaN
  • FFmpegCogXPCogLGPL-2.1-or-later
    Decodes AAC, ALAC, WMA, AC-3, DTS and most container formats
  • File_ExtractorCogLGPL-2.1-or-later
    Plays music straight out of archives
    © Shay Green
  • Fraunhofer FDK AACCogFDK AAC licence
    Decodes AAC for FFmpeg and vgmstream
  • G.719 reference codeCog
    Decodes G.719 for vgmstream
  • Game Music EmuCogXPCogLGPL-2.1-or-later
    Plays console chiptunes (NSF, SPC, GBS, VGM and more)
  • HighlyExperimentalCogXPCog
    Emulates the PlayStation for PSF and PSF2
  • HighlyQuixoticCogXPCog
    Emulates Capcom QSound for QSF
  • HighlyTheoreticalCogXPCogGPL-3.0
    Emulates the Sega Saturn and Dreamcast for SSF and DSF
  • Hively replayerCogXPCog
    Plays AHX and HivelyTracker modules
  • inihCogBSD-3-Clause
    Parses INI files inside mGBA
    © Ben Hoyt
  • lazyusf2CogXPCogGPL-2.0-or-later
    Emulates the Nintendo 64 for USF
  • libarchiveXPCogBSD-2-Clause
    Plays music straight out of archives
    © 2003–2010 Tim Kientzle
  • LibAtrac9CogMIT
    Decodes ATRAC9 for vgmstream
    © Alex Barney
  • libbinioCogXPCogLGPL-2.1-or-later
    Reads files for AdPlug
  • libFLACCogXPCogBSD-3-Clause
    Decodes FLAC
    © 2000–2009 Josh Coalson; © 2011–2025 Xiph.Org Foundation
  • libid3tagCogGPL-2.0-or-later
    Reads ID3 tags for the MP3 decoder
    © Underbit Technologies
  • liboggCogXPCogBSD-3-Clause
    Reads the Ogg container
    © 2002 Xiph.Org Foundation
  • libopenmptCogXPCogBSD-3-Clause
    Plays tracker modules (MOD, S3M, XM, IT and more)
    © 2004–2026 OpenMPT Project Developers and Contributors; © 1997–2003 Olivier Lapicque
  • libsidplayfpCogXPCogGPL-2.0-or-later
    Plays Commodore 64 SID tunes
  • libvgmCogXPCog
    Plays VGM, S98, DRO and GYM chip logs
  • libvorbisCogXPCogBSD-3-Clause
    Decodes Ogg Vorbis
    © 2002–2020 Xiph.Org Foundation
  • LZ4XPCogBSD-2-Clause
    Decompresses LZ4 archives for libarchive
    © 2011–2020 Yann Collet
  • LZMA SDK (7z_C)CogPublic domain
    Extracts 7-Zip archives
  • melonDSCogXPCogGPL-3.0-or-later
    Emulates the Nintendo DS for 2SF
    © 2016–2026 melonDS team
  • mGBACogXPCogMPL-2.0
    Plays GSF (Game Boy Advance) rips
  • minimp3CogXPCogCC0-1.0
    Decodes MP3
  • mpg123CogXPCogLGPL-2.1-only
    Decodes MP3 samples inside tracker modules and game streams
    © 1995–2020 Michael Hipp and others
  • MusashiCogXPCogMusashi licence (free for non-commercial use)
    Emulates the 68000 for HighlyTheoretical
    © Karl Stenerud
  • Musepack decoder (libmpcdec)CogXPCogBSD-3-Clause
    Decodes Musepack
    © 2005 The Musepack Development Team
  • Nuked OPL3CogXPCogGPL-2.0-or-later
    Emulates the OPL3 for MIDI playback
    © 2013–2016 Alexey Khokholov (Nuke.YKT)
  • Nuked SC-55CogXPCogMAME licence (non-commercial)
    Emulates the Roland SC-55
    © 2021, 2024 nukeykt
  • OpusCogXPCogBSD-3-Clause
    Decodes Opus
    © 2001–2023 Xiph.Org, Skype Limited, Octasic and contributors
  • opusfileCogXPCogBSD-3-Clause
    Reads Opus files
    © 1994–2013 Xiph.Org Foundation and contributors
  • Organya playerCogXPCog
    Plays Cave Story's Organya music
    Joel Yliluoma
  • psflibCogXPCog
    Reads the PSF container
  • SFBAudioEngine Core Audio decoderCogGPL-2.0-or-later
    Decodes through Core Audio
    © Stephen F. Booth
  • SHA-1 (Steve Reid)XPCogPublic domain
    Provides SHA-1 inside melonDS
    By Steve Reid
  • ShortenCogGPL-2.0 plus the Shorten licence (not to be sold without SoftSound's permission)
    Decodes Shorten (.shn)
  • Snes9xCogXPCogSnes9x licence (non-commercial)
    Emulates the Super Nintendo for SNSF
    © 1996–2002 Gary Henderson and the Snes9x team
  • Snes9x APUCogXPCogLGPL-2.1
    Emulates the SNES sound processor
  • SpeexCogBSD-3-Clause
    Decodes Speex for vgmstream
    © Jean-Marc Valin
  • SpessaSynth CoreCogXPCogApache-2.0
    Synthesises MIDI with SoundFonts
  • SSEQPlayerCogXPCog
    Plays NCSF (Nintendo DS SSEQ)
    Naram Qashat (CyberBotX)
  • stb_vorbisCogMIT OR Unlicense
    Decodes Ogg-compressed SoundFont samples
    © Sean Barrett
  • Syntrax (libjaytrax)CogXPCogGPL-3.0-only
    Plays Syntrax modules
    © Reinier van Vliet; © Christopher Snowhill
  • TagLibCogXPCogLGPL-2.1-only OR MPL-1.1
    Reads tags
  • TeakraCogMIT
    Emulates the DSi DSP inside melonDS
  • tiny-AES-cCogXPCogUnlicense
    Provides AES inside melonDS
  • UnRARCogUnRAR licence (freeware; may not be used to re-create RAR compression)
    Extracts RAR archives
  • UTF8-CPPXPCogBSL-1.0
    Converts text for TagLib
  • VBA-MCogGPL-2.0-or-later
    Emulates the Game Boy Advance for HighlyComplete
  • vgmstreamCogXPCogISC
    Plays several hundred game audio stream formats
    © 2008–2025 Adam Gashlin, Fastelbja, Ronny Elfert, bnnm and others
  • vorbis-tools picture codeCogGPL-2.0-or-later
    Reads Vorbis cover art
  • WavPackCogXPCogBSD-3-Clause
    Decodes WavPack
    © 1998–2025 David Bryant
  • xxHashXPCogBSD-2-Clause
    Provides hashing inside melonDS
    © 2012–2023 Yann Collet
  • XZ Utils (liblzma)XPCog0BSD
    Decompresses XZ and LZMA archives for libarchive
  • ZstandardXPCogBSD-3-Clause
    Decompresses Zstandard archives for libarchive
    © Meta Platforms, Inc. and affiliates
Processing

Audio processing

  • DeaDBeeF FFTCogZlib
    Provides the spectrum analyser's FFT
    © Alexey Yakovenko
  • dsd2pcmXPCogBSD
    Converts DSD to PCM
    Sebastian Gesemann
  • FreeSurroundCogXPCogGPL-2.0-or-later
    Upmixes stereo to surround
    © 2007–2010 Christian Kothe
  • HDCD decoder (hdcd_decode2)CogXPCogBSD-3-Clause
    Decodes HDCD
    © 2010–2023 Christopher Snowhill
  • HRTF (MinPHR) loaderCog
    Loads HRTF data for headphone virtualisation
  • libsamplerateXPCogBSD-2-Clause
    Resamples for Rubber Band
    © 2012–2016 Erik de Castro Lopo
  • LPC extrapolation (lvqcl)CogXPCogISC
    Extrapolates gapless edges
    © 2013, 2018 lvqcl
  • miniaudioXPCogUnlicense OR MIT-0
    Plays audio to the output device
    David Reid
  • Rubber Band LibraryCogXPCogGPL-2.0-or-later
    Changes pitch and tempo independently
  • SFBAudioEngine Core Audio utilitiesCogGPL-2.0-or-later
    Helpers for Core Audio
    © Stephen F. Booth
  • Signalsmith LinearCogXPCogMIT
    Provides the FFT under Signalsmith Stretch
    © 2025 Signalsmith Audio
  • Signalsmith StretchCogXPCogMIT
    Changes pitch and tempo independently
    © 2022 Geraint Luff / Signalsmith Audio Ltd.
  • SLEEFXPCogBSL-1.0
    Vector maths for Rubber Band
  • SoX Resampler (libsoxr)CogXPCogLGPL-2.1-or-later
    Converts sample rates
    © 2007–2018 robs@users.sourceforge.net
Interface

Interface

  • AVIFQuickLook decoderCog
    Decodes AVIF cover art
  • BrotliXPCogMIT
    Compresses the remote control's HTTP responses
    © 2009, 2010, 2013–2016 the Brotli Authors
  • C++/WinRTXPCogMIT
    Calls the Windows Runtime from C++
    © Microsoft Corporation
  • cpp-httplibXPCogMIT
    Serves XPCog's remote control
    © 2017 yhirose
  • CrashpadXPCogApache-2.0
    Catches crashes for sentry-native
  • dav1dCog
    Decodes AV1 for libavif
  • DeaDBeeF spectrum analyserCogZlib
    The spectrum analyser
    © Alexey Yakovenko
  • dirent for WindowsXPCogMIT
    Lists folders for the PSF cores on Windows
    © 1998–2019 Toni Ronkko
  • GLibXPCogLGPL-2.1-or-later
    D-Bus, media keys and notifications on Linux
  • GTKXPCogLGPL-2.1-or-later
    Draws XPCog's interface on Linux
  • ImageTextCellCog
    Table cells with an icon
  • json-parser and json-builderCogBSD-2-Clause
    Reads and writes JSON
    © James McLaughlin
  • libadwaitaXPCogLGPL-2.1-or-later
    Draws XPCog's interface on Linux
  • libavifCogBSD-2-Clause
    Decodes AVIF cover art
    © Joe Drago
  • libcurlXPCogcurl
    Fetches HTTP and internet radio
    © 1996–2026 Daniel Stenberg and many contributors
  • libsecretXPCogLGPL-2.1-or-later
    Keeps passwords in the system keyring on Linux
  • libunwindXPCogMIT
    Stack traces in crash reports on Linux
    © 2002 Hewlett-Packard Co.
  • libyuvCog
    Converts colours for libavif
  • Logging.hCog
    Debug logging macros
  • MASShortcutCogBSD-2-Clause
    Global keyboard shortcuts
    © Vadim Shpakovski
  • MCP Swift SDKCogApache-2.0 AND MIT
    The CogMCP server
  • nlohmann/jsonXPCogMIT
    Reads web services' replies
    © 2013–2025 Niels Lohmann
  • OpenSSLXPCogApache-2.0
    Secures HTTPS for libcurl
  • OpenURLPanelCogApple sample code licence
    The Open URL dialog
    © 2004–2005 Apple Computer, Inc.
  • RetroArch Metal shadersCogGPL-3.0-or-later
    Visualisation shaders
    © Stuart Carnie, Daniel De Matteis
  • sentry-cocoaCogMIT
    Crash reporting
    © 2015 Sentry
  • sentry-nativeXPCogMIT
    Opt-in crash reporting
    © 2019 Sentry and individual contributors
  • SFBAudioEngine seconds formatterCogGPL-2.0-or-later
    Formats times
    © Stephen F. Booth
  • SQLiteXPCogPublic domain
    Stores the music library
  • Swagger UIXPCogApache-2.0
    Shows the remote control's API documentation
  • swift-logCogApache-2.0
    Logging
    © 2018, 2019 The SwiftLog Project
  • SwiftNIOCogApache-2.0
    Networking for CogMCP
    © 2017, 2018 The SwiftNIO Project
  • swiftui-introspectCogMIT
    SwiftUI introspection
    © 2019 Timber Software
  • Win2DXPCogMIT
    Draws the spectrum, the oscilloscope and the waveform on Windows
    © Microsoft Corporation
  • Windows App SDKXPCogMIT
    Windowing, startup and single instance on Windows
    © Microsoft Corporation
  • WinUI 3XPCogMIT
    Draws XPCog's interface on Windows
    © Microsoft Corporation
  • zlibXPCogZlib
    Decompression throughout
    © 1995–2026 Jean-loup Gailly and Mark Adler
Data

Data

  • AdPlug databaseCogXPCogPublic domain
    Per-song playback fixes for AdPlug
  • Commodore 64 ROMsCogXPCog
    KERNAL, BASIC and character ROMs for SID playback
    Commodore
  • GeneralUser GSCogXPCogGeneralUser GS License v2.0
    The bundled General MIDI SoundFont
    © 1997–2025 S. Christian Collins
  • GeneralUser XG (SFe test)CogXPCogGeneralUser GS License v2.0
    The bundled XG SoundFont
    © 2025–2026 SFe Team and contributors; portions © 1997–2026 S. Christian Collins
  • Organya wavetable and PixTone soundsCogXPCog
    Instruments and drums for Organya music
    Pixel (Daisuke Amaya)
  • PlayStation 2 BIOS sound modulesCogXPCog
    Runs PSF and PSF2 rips under HighlyExperimental
    Sony
  • SADIE II HRTF (D02)Cog
    Headphone impulse responses for HRTF
  • TG300B patch mapCogXPCog
    Maps TG300B patches to XG for the SFe bank
  • YRW801 sample ROMXPCog
    The OPL4 wavetable, under libvgm
    Yamaha