gnu: Add libaom.

* gnu/packages/video.scm (libaom): New variable.

Co-authored-by: Leo Famulari <leo@famulari.name>

gnu/packages/video.scm

@@ -33,6 +33,7 @@
 ;;; Copyright © 2018 Gábor Boskovit <boskovits@gmail.com>
 ;;; Copyright © 2019 Mathieu Othacehe <m.othacehe@gmail.com>
 ;;; Copyright © 2019 Timo Eisenmann <eisenmann@fn.de>
+;;; Copyright © 2019 Arne Babenhauserheide <arne_bab@web.de>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -240,6 +241,43 @@ A/52 standard is used in a variety of applications, including digital
 television and DVD.  It is also known as AC-3.")
     (license license:gpl2+)))
 
+(define-public libaom
+  ;; The 1.0.0-errata1 release installs a broken pkg-config .pc file.  This
+  ;; is fixed in libaom commit 0ddc150, but we use an even later commit.
+  (let ((commit "22b150bf040608028a56d8bf39e72f771383d836")
+        (revision "0"))
+    (package
+      (name "libaom")
+      (version (git-version "1.0.0-errata1" revision commit))
+      (source (origin
+                (method git-fetch)
+                (uri (git-reference
+                      (url "https://aomedia.googlesource.com/aom/")
+                      (commit commit)))
+                (file-name (git-file-name name version))
+                (sha256
+                 (base32
+                  "1pdd5h3n42607n6qmggz4yv8izhjr2kl6knb3kh7gh4v0vy47h1r"))))
+      (build-system cmake-build-system)
+      (native-inputs
+       `(("perl" ,perl)
+         ("pkg-config" ,pkg-config)
+         ("python" ,python))) ; to detect the version
+      (arguments
+       `(#:tests? #f  ;no check target
+         #:configure-flags
+           ;; build dynamic library
+         (list "-DBUILD_SHARED_LIBS=YES"
+               "-DENABLE_PIC=TRUE"
+               "-DAOM_TARGET_CPU=generic"
+               (string-append "-DCMAKE_INSTALL_PREFIX="
+                                (assoc-ref %outputs "out")))))
+      (home-page "https://aomedia.googlesource.com/aom/")
+      (synopsis "AV1 video codec")
+      (description "Libaom is the reference implementation of AV1.  It includes
+a shared library and encoder and decoder command-line executables.")
+      (license license:bsd-2))))
+
 (define-public libmpeg2
   (package
     (name "libmpeg2")