Audio : Introduces linux audio

Signed-off-by: BlackMinou <romain.chanoir@viacesi.fr>

diff --git a/lib/linux/audio.nit b/lib/linux/audio.nit
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+# This file is part of NIT ( http://www.nitlanguage.org ).
+#
+# Copyright 2015 Romain Chanoir  <romain.chanoir@viacesi.fr>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Linux audio services
+module audio
+
+import app::audio
+import mnit_linux::linux_assets
+
+# Simple audio asset
+redef class Sound
+
+       redef fun play do
+               if name.has_suffix(".wav") then
+                       sys.system "aplay -q {app.assets_dir}{name} &"
+               else if name.has_suffix(".mp3") then
+                       sys.system "mpg123 -q {app.assets_dir}{name} &"
+               end
+       end
+
+       redef fun load do end
+       redef fun pause do end
+       redef fun resume do end
+end
+
+redef class Music
+
+       redef fun play do
+               if name.has_suffix(".wav") then
+                       sys.system "aplay -q {app.assets_dir}{name} &"
+               else if name.has_suffix(".mp3") then
+                       sys.system "mpg123 -q {app.assets_dir}{name} &"
+               end
+       end
+
+       redef fun load do end
+       redef fun pause do end
+       redef fun resume do end
+end
+
+redef class App
+       redef fun load_sound(name)
+       do
+               return new Sound(name)
+       end
+
+       redef fun load_music(name)
+       do
+               return new Music(name)
+       end
+end