gnu: Add audacity.

* gnu/packages/audacity.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.
* gnu/packages/patches/audacity-fix-ffmpeg-binding.patch: New file.
* gnu-system.am (dist_patch_DATA): Add it.

gnu-system.am

@@ -38,6 +38,7 @@ GNU_SYSTEM_MODULES =				\
   gnu/packages/asciidoc.scm			\
   gnu/packages/aspell.scm			\
   gnu/packages/attr.scm				\
+  gnu/packages/audacity.scm			\
   gnu/packages/audio.scm			\
   gnu/packages/autogen.scm			\
   gnu/packages/autotools.scm			\
@@ -369,6 +370,7 @@ dist_patch_DATA =						\
   gnu/packages/patches/ath9k-htc-firmware-binutils.patch	\
   gnu/packages/patches/ath9k-htc-firmware-gcc.patch		\
   gnu/packages/patches/ath9k-htc-firmware-objcopy.patch		\
+  gnu/packages/patches/audacity-fix-ffmpeg-binding.patch	\
   gnu/packages/patches/automake-skip-amhello-tests.patch	\
   gnu/packages/patches/avahi-localstatedir.patch		\
   gnu/packages/patches/avrdude-fix-libusb.patch			\

gnu/packages/audacity.scm

+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2015 Taylan Ulrich Bayırlı/Kammer <taylanbayirli@gmail.com>
+;;;
+;;; 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 audacity)
+  #:use-module (guix packages)
+  #:use-module (guix download)
+  #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (guix build-system gnu)
+  #:use-module (gnu packages)
+  #:use-module (gnu packages audio)
+  #:use-module (gnu packages base)
+  #:use-module (gnu packages gtk)
+  #:use-module (gnu packages linux)
+  #:use-module (gnu packages mp3)
+  #:use-module (gnu packages pkg-config)
+  #:use-module (gnu packages pulseaudio)
+  #:use-module (gnu packages python)
+  #:use-module (gnu packages xiph)
+  #:use-module (gnu packages xml)
+  #:use-module (gnu packages video)
+  #:use-module (gnu packages wxwidgets))
+
+(define-public audacity
+  (package
+    (name "audacity")
+    (version "2.1.0")
+    (source
+     (origin
+       (method url-fetch)
+       (uri
+        (string-append
+         "mirror://sourceforge/audacity/audacity-minsrc-" version ".tar.xz"))
+       (sha256
+        (base32 "1cs2w3fwqylpqmfwkvlgdx5lhclpckfil7pqibl37qlbnf4qvndh"))
+       (patches (list (search-patch "audacity-fix-ffmpeg-binding.patch")))))
+    (build-system gnu-build-system)
+    (inputs
+     ;; TODO: Add portSMF and libwidgetextra once they're packaged.  In-tree
+     ;; versions shipping with Audacity are used for now.
+     `(("wxwidgets" ,wxwidgets-2)
+       ("gtk" ,gtk+-2)
+       ("alsa-lib" ,alsa-lib)
+       ("jack" ,jack-2)
+       ("expat" ,expat)
+       ("ffmpeg" ,ffmpeg)
+       ("lame" ,lame)
+       ("flac" ,flac)
+       ("libid3tag" ,libid3tag)
+       ("libmad" ,libmad)
+       ("libsbsms" ,libsbsms)
+       ("libsndfile" ,libsndfile)
+       ("soundtouch" ,soundtouch)
+       ("soxr" ,soxr)                   ;replaces libsamplerate
+       ("twolame" ,twolame)
+       ("vamp" ,vamp)
+       ("libvorbis" ,libvorbis)
+       ("lv2" ,lv2)
+       ("lilv" ,lilv)
+       ("portaudio" ,portaudio)))
+    (native-inputs
+     `(("pkg-config" ,pkg-config)
+       ("python" ,python-2)
+       ("which" ,which)))
+    (arguments
+     '(#:configure-flags
+       (let ((libid3tag (assoc-ref %build-inputs "libid3tag"))
+             (libmad (assoc-ref %build-inputs "libmad")))
+         (list
+          ;; Loading FFmpeg dynamically is problematic.
+          "--disable-dynamic-loading"
+          ;; libid3tag and libmad provide no .pc files, so pkg-config fails to
+          ;; find them.  Force their inclusion.
+          (string-append "ID3TAG_CFLAGS=-I" libid3tag "/include")
+          (string-append "ID3TAG_LIBS=-L" libid3tag "/lib -lid3tag -lz")
+          (string-append "LIBMAD_CFLAGS=-I" libmad "/include")
+          (string-append "LIBMAD_LIBS=-L" libmad "/lib -lmad")))
+       ;; The test suite is not "well exercised" according to the developers,
+       ;; and fails with various errors.  See
+       ;; <http://sourceforge.net/p/audacity/mailman/message/33524292/>.
+       #:tests? #f))
+    (home-page "http://audacity.sourceforge.net/")
+    (synopsis "Software for recording and editing sounds")
+    (description
+     "Audacity is a multi-track audio editor designed for recording, playing
+and editing digital audio.  It features digital effects and spectrum analysis
+tools.")
+    (license license:gpl2+)))

gnu/packages/patches/audacity-fix-ffmpeg-binding.patch

+This resolves some "declaration of C function conflicts with previous
+declaration" errors during compilation.
+
+--- a/src/FFmpeg.h	2015-02-21 00:33:33.853857529 +0100
++++ b/src/FFmpeg.h	2015-02-21 00:35:09.626497205 +0100
+@@ -688,7 +688,7 @@
+    FFMPEG_FUNCTION_WITH_RETURN(
+       AVOutputFormat*,
+       av_oformat_next,
+-      (AVOutputFormat *f),
++      (const AVOutputFormat *f),
+       (f)
+    );
+    FFMPEG_FUNCTION_WITH_RETURN(
+@@ -755,7 +755,7 @@
+    FFMPEG_FUNCTION_WITH_RETURN(
+       int,
+       av_fifo_size,
+-      (AVFifoBuffer *f),
++      (const AVFifoBuffer *f),
+       (f)
+    );
+    FFMPEG_FUNCTION_WITH_RETURN(
+@@ -801,7 +801,7 @@
+    FFMPEG_FUNCTION_WITH_RETURN(
+       AVDictionaryEntry *,
+       av_dict_get,
+-      (AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags),
++      (const AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags),
+       (m, key, prev, flags)
+    );
+    FFMPEG_FUNCTION_WITH_RETURN(