[jackhill/guix/guix.git] / gnu / packages / audio.scm

;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2015 Ricardo Wurmus <rekado@elephly.net>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (gnu packages audio)
  #:use-module (guix packages)
  #:use-module (guix download)
  #:use-module (guix git-download)
  #:use-module ((guix licenses) #:prefix license:)
  #:use-module (guix build-system gnu)
  #:use-module (guix build-system waf)
  #:use-module (guix build-system trivial)
  #:use-module (gnu packages)
  #:use-module (gnu packages algebra)
  #:use-module (gnu packages boost)
  #:use-module (gnu packages base)
  #:use-module (gnu packages compression)
  #:use-module (gnu packages curl)
  #:use-module (gnu packages databases)
  #:use-module (gnu packages glib)
  #:use-module (gnu packages gtk)
  #:use-module (gnu packages gnome)
  #:use-module (gnu packages qt)
  #:use-module (gnu packages linux)
  #:use-module (gnu packages mp3) ;taglib
  #:use-module (gnu packages perl)
  #:use-module (gnu packages pkg-config)
  #:use-module (gnu packages pulseaudio)  ;libsndfile, libsamplerate
  #:use-module (gnu packages python)
  #:use-module (gnu packages rdf)
  #:use-module (gnu packages readline)
  #:use-module (gnu packages xiph)
  #:use-module (gnu packages xml)
  #:use-module (srfi srfi-1))

(define-public aubio
  (package
    (name "aubio")
    (version "0.4.1")
    (source (origin
             (method url-fetch)
             (uri (string-append
                   "http://aubio.org/pub/aubio-" version ".tar.bz2"))
             (sha256
              (base32
               "15f6nf76y7iyl2kl4ny7ky0zpxfxr8j3902afvd6ydnnkh5dzmr5"))))
    (build-system waf-build-system)
    (arguments
     `(#:tests? #f  ; no check target
       #:configure-flags
       '("--enable-fftw3f"
         "--enable-jack"
         "--enable-sndfile"
         "--enable-samplerate"
         ;; enable compilation with avcodec once available
         "--disable-avcodec")
       #:python ,python-2))
    (inputs
     `(("jack" ,jack-1)
       ("libsndfile" ,libsndfile)
       ("libsamplerate" ,libsamplerate)
       ("fftwf" ,fftwf)))
    (native-inputs
     `(("pkg-config" ,pkg-config)))
    (home-page "http://aubio.org/")
    (synopsis "A library for audio labelling")
    (description
     "aubio is a tool designed for the extraction of annotations from audio
signals.  Its features include segmenting a sound file before each of its
attacks, performing pitch detection, tapping the beat and producing MIDI
streams from live audio.")
    (license license:gpl3+)))

(define-public ardour
  (package
    (name "ardour")
    (version "3.5.403")
    (source (origin
              ;; The project only provides tarballs upon individual request
              ;; (or after payment) so we take the code from git.
              (method git-fetch)
              (uri (git-reference
                    (url "git://git.ardour.org/ardour/ardour.git")
                    (commit version)))
              (snippet
               '(call-with-output-file
                    "libs/ardour/revision.cc"
                  (lambda (port)
                    (format port "#include \"ardour/revision.h\"
namespace ARDOUR { const char* revision = \"3.5-403-gec2cb31\" ; }"))))
              (sha256
               (base32
                "01b0wxh0wlxjfz5j8gcwwqhxc6q2kn4njz2fcmzv9fr3xaya5dbp"))
              (file-name (string-append name "-" version))))
    (build-system waf-build-system)
    (arguments
     `(#:tests? #f ; no check target
       #:python ,python-2))
    (inputs
     `(("alsa-lib" ,alsa-lib)
       ("aubio" ,aubio)
       ("lrdf" ,lrdf)
       ("boost" ,boost)
       ("atkmm" ,atkmm)
       ("cairomm" ,cairomm)
       ("gtkmm" ,gtkmm-2)
       ("glibmm" ,glibmm)
       ("libart-lgpl" ,libart-lgpl)
       ("libgnomecanvasmm" ,libgnomecanvasmm)
       ("pangomm" ,pangomm)
       ("liblo" ,liblo)
       ("libsndfile" ,libsndfile)
       ("libsamplerate" ,libsamplerate)
       ("libxml2" ,libxml2)
       ("libogg" ,libogg)
       ("libvorbis" ,libvorbis)
       ("flac" ,flac)
       ("lv2" ,lv2)
       ("vamp" ,vamp)
       ("curl" ,curl)
       ("fftw" ,fftw)
       ("fftwf" ,fftwf)
       ("jack" ,jack-1)
       ("serd" ,serd)
       ("sord" ,sord)
       ("sratom" ,sratom)
       ("suil" ,suil)
       ("lilv" ,lilv)
       ("rasqal" ,rasqal)
       ("raptor2" ,raptor2)
       ("redland" ,redland)
       ("rubberband" ,rubberband)
       ("taglib" ,taglib)
       ("python-rdflib" ,python-rdflib)))
    (native-inputs
     `(("perl" ,perl)
       ("pkg-config" ,pkg-config)))
    (home-page "http://ardour.org")
    (synopsis "Digital audio workstation")
    (description
     "Ardour is a multi-channel digital audio workstation, allowing users to
record, edit, mix and master audio and MIDI projects.  It is targeted at audio
engineers, musicians, soundtrack editors and composers.")
    (license license:gpl2+)))

(define-public azr3
  (package
    (name "azr3")
    (version "1.2.3")
    (source (origin
              (method url-fetch)
              (uri (string-append "mirror://savannah/ll-plugins/azr3-jack-"
                                  version
                                  ".tar.bz2"))
              (sha256
               (base32
                "18mdw6nc0vgj6k9rsy0x8w64wvzld0frqshrxxbxfj9qi9843vlc"))))
    (build-system gnu-build-system)
    (arguments
     `(#:tests? #f ; no check target
       #:make-flags
       (list "LV2PEG=ttl2c"
             (string-append "prefix=" %output)
             (string-append "pkgdatadir=" %output "/share/azr3-jack"))))
    (inputs
     `(("gtkmm" ,gtkmm-2)
       ("lvtk" ,lvtk)
       ("jack" ,jack-1)
       ("lash" ,lash)))
    (native-inputs
     `(("pkg-config" ,pkg-config)))
    (home-page "http://ll-plugins.nongnu.org/azr3/")
    (synopsis "Tonewheel organ synthesizer")
    (description
     "AZR-3 is a port of the free VST plugin AZR-3.  It is a tonewheel organ
with drawbars, distortion and rotating speakers.  The organ has three
sections, two polyphonic sections with nine drawbars each and one monophonic
bass section with five drawbars.  A standalone JACK application and LV2
plugins are provided.")
    (license license:gpl2)))

(define-public freepats
  (package
    (name "freepats")
    (version "20060219")
    (source (origin
              (method url-fetch)
              (uri (string-append "http://freepats.zenvoid.org/freepats-"
                                  version ".tar.bz2"))
              (sha256
               (base32
                "12iw36rd94zirll96cd5k0va7p5hxmf2shvjlhzihcmjaw8flq82"))))
    (build-system trivial-build-system)
    (arguments
     `(#:modules ((guix build utils))
       #:builder (begin
                   (use-modules (guix build utils))
                   (let ((out (string-append %output "/share/freepats")))
                     (setenv "PATH" (string-append
                                     (assoc-ref %build-inputs "bzip2") "/bin:"
                                     (assoc-ref %build-inputs "tar") "/bin"))
                     (system* "tar" "xvf" (assoc-ref %build-inputs "source"))
                     (chdir "freepats")
                     ;; Use absolute pattern references
                     (substitute* "freepats.cfg"
                       (("Tone_000") (string-append out "/Tone_000"))
                       (("Drum_000") (string-append out "/Drum_000")))
                     (mkdir-p out)
                     (copy-recursively "." out)))))
    (native-inputs
     `(("tar" ,tar)
       ("bzip2" ,bzip2)))
    (home-page "http://freepats.zenvoid.org")
    (synopsis "GUS compatible patches for MIDI players")
    (description
     "FreePats is a project to create a free and open set of GUS compatible
patches that can be used with softsynths such as Timidity and WildMidi.")
    ;; GPLv2+ with exception for compositions using these patches.
    (license license:gpl2+)))

(define-public jack-1
  (package
    (name "jack")
    (version "0.124.1")
    (source (origin
             (method url-fetch)
             (uri (string-append
                   "http://jackaudio.org/downloads/jack-audio-connection-kit-"
                   version
                   ".tar.gz"))
             (sha256
              (base32
               "1mk1wnx33anp6haxfjjkfhwbaknfblsvj35nxvz0hvspcmhdyhpb"))))
    (build-system gnu-build-system)
    (inputs
     `(("alsa-lib" ,alsa-lib)
       ("bdb" ,bdb)
       ("readline" ,readline)))
    ;; uuid.h is included in the JACK type headers
    (propagated-inputs
     `(("libuuid" ,util-linux)))
    (native-inputs
     `(("pkg-config" ,pkg-config)))
    (home-page "http://jackaudio.org/")
    (synopsis "JACK audio connection kit")
    (description
     "JACK is a low-latency audio server.  It can connect a number of
different applications to an audio device, as well as allowing them to share
audio between themselves.  JACK is different from other audio server efforts
in that it has been designed from the ground up to be suitable for
professional audio work.  This means that it focuses on two key areas:
synchronous execution of all clients, and low latency operation.")
    ;; Most files are licensed under the GPL. However, the libjack/ tree is
    ;; licensed under the LGPL in order to allow for proprietary usage.
    (license (list license:gpl2+ license:lgpl2.1+))))

(define-public jack-2
  (package (inherit jack-1)
    (name "jack2")
    (version "1.9.10")
    (source (origin
             (method url-fetch)
             (uri (string-append
                   "https://github.com/jackaudio/jack2/archive/v"
                   version
                   ".tar.gz"))
             (sha256
              (base32
               "03b0iiyk3ng3vh5s8gaqwn565vik7910p56mlbk512bw3dhbdwc8"))))
    (build-system waf-build-system)
    (arguments
     `(#:tests? #f  ; no check target
       #:configure-flags '("--dbus"
                           "--alsa")))
    (inputs
     `(("alsa-lib" ,alsa-lib)
       ("dbus" ,dbus)
       ("expat" ,expat)
       ("libsamplerate" ,libsamplerate)
       ("opus" ,opus)
       ("readline" ,readline)))
    (native-inputs
     `(("pkg-config" ,pkg-config)))
    ;; Most files are under GPLv2+, but some headers are under LGPLv2.1+
    (license (list license:gpl2+ license:lgpl2.1+))))

(define-public jalv
  (package
    (name "jalv")
    (version "1.4.6")
    (source (origin
              (method url-fetch)
              (uri (string-append "http://download.drobilla.net/jalv-"
                                  version ".tar.bz2"))
              (sha256
               (base32
                "1f1hcq74n3ziw8bk97mn5a1vgw028dxikv3fchaxd430pbbhqgl9"))))
    (build-system waf-build-system)
    (arguments `(#:tests? #f)) ; no check target
    (inputs
     `(("lv2" ,lv2)
       ("lilv" ,lilv)
       ("suil" ,suil)
       ("gtk" ,gtk+-2)
       ("gtkmm" ,gtkmm-2)
       ("qt" ,qt-4)
       ("jack" ,jack-1)))
    (native-inputs
     `(("pkg-config" ,pkg-config)))
    (home-page "http://drobilla.net/software/jalv/")
    (synopsis "Simple LV2 host for JACK")
    (description
     "Jalv is a simple but fully featured LV2 host for JACK.  It runs LV2
plugins and exposes their ports as JACK ports, essentially making any LV2
plugin function as a JACK application.")
    (license license:isc)))

(define-public ladspa
  (package
    (name "ladspa")
    (version "1.13")
    (source (origin
             (method url-fetch)
             (uri (string-append
                   "http://www.ladspa.org/download/ladspa_sdk_"
                   version
                   ".tgz"))
             (sha256
              (base32
               "0srh5n2l63354bc0srcrv58rzjkn4gv8qjqzg8dnq3rs4m7kzvdm"))))
    (build-system gnu-build-system)
    (arguments
     `(#:tests? #f  ; the "test" target is a listening test only
       #:phases
       (alist-replace
        'configure
        (lambda* (#:key inputs outputs #:allow-other-keys #:rest args)
          (chdir "src")
          (let ((out (assoc-ref outputs "out")))
            (substitute* "makefile"
              (("/usr/lib/ladspa/") (string-append out "/lib/ladspa/"))
              (("/usr/include/")    (string-append out "/include/"))
              (("/usr/bin/")        (string-append out "/bin/"))
              (("-mkdirhier")       "mkdir -p")
              (("^CC.*")            "CC = gcc\n")
              (("^CPP.*")           "CPP = g++\n"))))
        (alist-delete 'build %standard-phases))))
    (home-page "http://ladspa.org")
    (synopsis "Linux Audio Developer's Simple Plugin API (LADSPA)")
    (description
     "LADSPA is a standard that allows software audio processors and effects
to be plugged into a wide range of audio synthesis and recording packages.")
    (license license:lgpl2.1+)))

(define-public lash
  (package
    (name "lash")
    (version "0.6.0-rc2")
    (source (origin
              (method url-fetch)
              ;; The tilde is not permitted in the builder name, but is used
              ;; in the tarball.
              (uri (string-append
                    "mirror://savannah/lash/lash-"
                    (string-join (string-split version #\-) "~")
                    ".tar.bz2"))
              (file-name (string-append name "-" version ".tar.bz2"))
              (sha256
               (base32
                "12z1vx3krrzsfccpah9xjs68900xvr7bw92wx8np5871i2yv47iw"))))
    (build-system gnu-build-system)
    (inputs
     `(("bdb" ,bdb)
       ("gtk" ,gtk+-2)
       ("jack" ,jack-1)
       ("readline" ,readline)
       ("python" ,python-2)))
    ;; According to pkg-config, packages depending on lash also need to have
    ;; at least the following packages declared as inputs.
    (propagated-inputs
     `(("alsa-lib" ,alsa-lib)
       ("dbus" ,dbus)
       ("libxml2" ,libxml2)))
    (native-inputs
     `(("pkg-config" ,pkg-config)))
    (home-page "http://www.nongnu.org/lash/")
    (synopsis "Audio application session manager")
    (description
     "LASH is a session management system for audio applications.  It allows
you to save and restore audio sessions consisting of multiple interconneced
applications, restoring program state (i.e. loaded patches) and the
connections between them.")
    (license license:gpl2+)))

(define-public liblo
  (package
    (name "liblo")
    (version "0.28")
    (source (origin
             (method url-fetch)
             (uri (string-append
                   "mirror://sourceforge/liblo/liblo-"
                   version
                   ".tar.gz"))
             (sha256
              (base32
               "02drgnpirvl2ihvzgsmn02agr5sj3vipzzw9vma56qlkgfvak56s"))))
    (build-system gnu-build-system)
    (arguments
     `(;; liblo test FAILED
       ;; liblo server error 19 in setsockopt(IP_ADD_MEMBERSHIP): No such device
       #:tests? #f))
    (home-page "http://liblo.sourceforge.net")
    (synopsis "Implementation of the Open Sound Control protocol")
    (description
     "liblo is a lightweight library that provides an easy to use
implementation of the Open Sound Control (OSC) protocol.")
    (license license:lgpl2.1+)))

(define-public lilv
  (package
    (name "lilv")
    (version "0.20.0")
    (source (origin
             (method url-fetch)
             (uri (string-append "http://download.drobilla.net/lilv-"
                                 version
                                 ".tar.bz2"))
             (sha256
              (base32
               "0aj2plkx56iar8vzjbq2l7hi7sp0ml99m0h44rgwai2x4vqkk2j2"))))
    (build-system waf-build-system)
    (arguments `(#:tests? #f)) ; no check target
    ;; required by lilv-0.pc
    (propagated-inputs
     `(("serd" ,serd)
       ("sord" ,sord)
       ("sratom" ,sratom)))
    (inputs
     `(("lv2" ,lv2)))
    (native-inputs
     `(("pkg-config" ,pkg-config)))
    (home-page "http://drobilla.net/software/lilv/")
    (synopsis "Library to simplify use of LV2 plugins in applications")
    (description
     "Lilv is a C library to make the use of LV2 plugins as simple as possible
for applications.  Lilv is the successor to SLV2, rewritten to be
significantly faster and have minimal dependencies.")
    (license license:isc)))

(define-public lv2
  (package
    (name "lv2")
    (version "1.10.0")
    (source (origin
             (method url-fetch)
             (uri (string-append "http://lv2plug.in/spec/lv2-"
                                 version
                                 ".tar.bz2"))
             (sha256
              (base32
               "1md41x9snrp4mcfyli7lyfpvcfa78nfy6xkdy84kppnl8m5qw378"))))
    (build-system waf-build-system)
    (arguments
     `(#:tests? #f  ; no check target
       #:configure-flags '("--lv2-system")))
    (inputs
     ;; Leaving off cairo and gtk+-2.0 which are needed for example plugins
     `(("libsndfile" ,libsndfile)))
    (native-inputs
     `(("pkg-config" ,pkg-config)))
    (home-page "http://lv2plug.in/")
    (synopsis "LV2 audio plugin specification")
    (description
     "LV2 is an open specification for audio plugins and host applications.
At its core, LV2 is a simple stable interface, accompanied by extensions which
add functionality to support the needs of increasingly powerful audio
software.")
    (license license:isc)))

(define-public lvtk
  (package
    (name "lvtk")
    (version "1.2.0")
    (source (origin
             (method url-fetch)
             (uri (string-append "https://github.com/lvtk/lvtk/archive/"
                                 version
                                 ".tar.gz"))
             (sha256
              (base32
               "03nbj2cqcklqwh50zj2gwm07crh5iwqbpxbpzwbg5hvgl4k4rnjd"))))
    (build-system waf-build-system)
    (arguments
     `(#:tests? #f  ; no check target
       #:python ,python-2
       #:configure-flags
       (list (string-append "--boost-includes="
                            (assoc-ref %build-inputs "boost")
                            "/include"))))
    (inputs
     `(("boost" ,boost)
       ("lv2" ,lv2)))
    (native-inputs
     `(("pkg-config" ,pkg-config)))
    (home-page "https://github.com/lvtk/lvtk")
    (synopsis "C++ libraries for LV2 plugins")
    (description
     "The LV2 Toolkit (LVTK) contains libraries that wrap the LV2 C API and
extensions into easy to use C++ classes.  It is the successor of
lv2-c++-tools.")
    (license license:gpl3+)))

(define-public patchage
  (package
    (name "patchage")
    (version "1.0.0")
    (source (origin
              (method url-fetch)
              (uri (string-append "http://download.drobilla.net/patchage-"
                                  version
                                  ".tar.bz2"))
              (sha256
               (base32
                "1agdpwwi42176l4mxj0c4fsvdiv1ig56bfnnx0msckxmy57df8bb"))))
    (build-system waf-build-system)
    (arguments `(#:tests? #f)) ; no check target
    (inputs
     `(("alsa-lib" ,alsa-lib)
       ("boost" ,boost)
       ("jack" ,jack-1)
       ("ganv" ,ganv)
       ("glib" ,glib)
       ("glibmm" ,glibmm)
       ("gtkmm" ,gtkmm-2)
       ("dbus" ,dbus)
       ("dbus-glib" ,dbus-glib)))
    (native-inputs
     `(("pkg-config" ,pkg-config)))
    (home-page "http://drobilla.net/software/patchage/")
    (synopsis "Modular patch bay for audio and MIDI systems")
    (description
     "Patchage is a modular patch bay for audio and MIDI systems based on JACK
and ALSA.")
    (license license:gpl3+)))

(define-public rubberband
  (package
    (name "rubberband")
    (version "1.8.1")
    (source (origin
              (method url-fetch)
              (uri
               (string-append "https://bitbucket.org/breakfastquay/rubberband/get/v"
                              version
                              ".tar.bz2"))
              (sha256
               (base32
                "05amrbrxx0da3w7m237q51799r8xgs4ffqabi2qv06hq8dpcj386"))))
    (build-system gnu-build-system)
    (arguments `(#:tests? #f)) ; no check target
    (inputs
     `(("ladspa" ,ladspa)
       ("libsamplerate" ,libsamplerate)
       ("vamp" ,vamp)))
    (native-inputs
     `(("pkg-config" ,pkg-config)))
    (home-page "http://breakfastquay.com/rubberband/")
    (synopsis "Audio time-stretching and pitch-shifting library")
    (description
     "Rubber Band is a library and utility program that permits changing the
tempo and pitch of an audio recording independently of one another.")
    (license license:gpl2+)))

(define-public sratom
  (package
    (name "sratom")
    (version "0.4.6")
    (source (origin
             (method url-fetch)
             (uri (string-append "http://download.drobilla.net/sratom-"
                                 version
                                 ".tar.bz2"))
             (sha256
              (base32
               "080jjiyxjnj7hf25844hd9rb01grvzz1rk8mxcdnakywmspbxfd4"))))
    (build-system waf-build-system)
    (arguments `(#:tests? #f)) ; no check target
    (inputs
     `(("lv2" ,lv2)
       ("serd" ,serd)
       ("sord" ,sord)))
    (native-inputs
     `(("pkg-config" ,pkg-config)))
    (home-page "http://drobilla.net/software/sratom/")
    (synopsis "Library for serialising LV2 atoms to/from RDF")
    (description
     "Sratom is a library for serialising LV2 atoms to/from RDF, particularly
the Turtle syntax.")
    (license license:isc)))

(define-public suil
  (package
    (name "suil")
    (version "0.8.2")
    (source (origin
             (method url-fetch)
             (uri (string-append "http://download.drobilla.net/suil-"
                                 version
                                 ".tar.bz2"))
             (sha256
              (base32
               "1s3adyiw7sa5gfvm5wasa61qa23629kprxyv6w8hbxdiwp0hhxkq"))))
    (build-system waf-build-system)
    (arguments `(#:tests? #f)) ; no check target
    (inputs
     `(("lv2" ,lv2)
       ("gtk+-2" ,gtk+-2)
       ("qt-4" ,qt-4)))
    (native-inputs
     `(("pkg-config" ,pkg-config)))
    (home-page "http://drobilla.net/software/suil/")
    (synopsis "Library for loading and wrapping LV2 plugin UIs")
    (description
     "Suil is a lightweight C library for loading and wrapping LV2 plugin UIs.

Suil makes it possible to load a UI of a toolkit in a host using another
toolkit.  The API is designed such that hosts do not need to explicitly
support specific toolkits – if Suil supports a particular toolkit, then UIs in
that toolkit will work in all hosts that use Suil automatically.

Suil currently supports every combination of Gtk 2, Qt 4, and X11.")
    (license license:isc)))

(define-public vamp
  (package
    (name "vamp")
    (version "2.5")
    (source (origin
              (method url-fetch)
              (uri (string-append
                    "https://code.soundsoftware.ac.uk"
                    "/attachments/download/690/vamp-plugin-sdk-"
                    version
                    ".tar.gz"))
              (sha256
               (base32
                "178kfgq08cmgdzv7g8dwyjp4adwx8q04riimncq4nqkm8ng9ywbv"))))
    (build-system gnu-build-system)
    (arguments
     `(#:tests? #f                      ; no check target
       #:phases
       (alist-cons-after
        'install 'remove-libvamp-hostsdk.la
        (lambda* (#:key outputs #:allow-other-keys)
          ;; https://bugs.launchpad.net/ubuntu/+source/vamp-plugin-sdk/+bug/1253656
          (for-each delete-file
                    (let ((out (assoc-ref outputs "out")))
                      (list (string-append out "/lib/libvamp-sdk.la")
                            (string-append out "/lib/libvamp-hostsdk.la"))))
          #t)
        %standard-phases)))
    (inputs
     `(("libsndfile" ,libsndfile)))
    (native-inputs
     `(("pkg-config" ,pkg-config)))
    (home-page "http://vamp-plugins.org")
    (synopsis "Modular and extensible audio processing system")
    (description
     "Vamp is an audio processing plugin system for plugins that extract
descriptive information from audio data — typically referred to as audio
analysis plugins or audio feature extraction plugins.")
    (license
     (license:x11-style
      "https://code.soundsoftware.ac.uk/projects/vamp-plugin-sdk/repository/entry/COPYING"))))