App: Audio abstraction in App

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

diff --git a/lib/app/audio.nit b/lib/app/audio.nit
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+# This file is part of NIT ( http://www.nitlanguage.org ).
+#
+# Copyright 2014 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.
+
+# App audio abstraction
+#
+# Once the application has started (after `App.setup`)
+# use `App.load_sound` to get a sound
+# then `Sound.play` to play it
+module audio
+
+import app_base
+
+# Abstraction of a sound
+abstract class Sound
+
+       # Plays the sound
+       fun play is abstract
+
+       # Pauses the sound
+       fun pause is abstract
+
+       # Resumes the sound
+       fun resume is abstract
+end
+
+redef class App
+
+       # Loads a sound from the assets of the app, returns `null` if the loading failed
+       fun load_sound(name: String): nullable Sound do return null
+end