Support for Wav and Aac audio encoding

src/FFMpeg/Format/Audio/Aac.php

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+<?php
+
+/*
+ * This file is part of PHP-FFmpeg.
+ *
+ * (c) Alchemy <info@alchemy.fr>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FFMpeg\Format\Audio;
+
+/**
+ * The AAC audio format
+ */
+class Aac extends DefaultAudio
+{
+    public function __construct()
+    {
+        $this->audioCodec = 'libfdk_aac';
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function getAvailableAudioCodecs()
+    {
+        return array('libfdk_aac');
+    }
+}

src/FFMpeg/Format/Audio/Wav.php

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+<?php
+
+/*
+ * This file is part of PHP-FFmpeg.
+ *
+ * (c) Alchemy <info@alchemy.fr>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FFMpeg\Format\Audio;
+
+/**
+ * The WAV audio format
+ */
+class Wav extends DefaultAudio
+{
+    public function __construct()
+    {
+        $this->audioCodec = 'pcm_s16le';
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function getAvailableAudioCodecs()
+    {
+        return array('pcm_s16le');
+    }
+}