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diff --git a/src/AACDecoder.h b/src/AACDecoder.h
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+/* ------------------------------------------------------------------
+ * Copyright (C) 2011 Martin Storsjo
+ * Copyright (C) 2017 Matthias P. Braendli
+ *
+ * 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.
+ * -------------------------------------------------------------------
+ */
+
+/*!
+ *  \file AACDecoder.h
+ *  \brief Uses FDK-AAC to decode the AAC format for loopback tests and
+ *         to measure the audio level
+ */
+
+#pragma once
+
+#include <fdk-aac/aacdecoder_lib.h>
+#include <cstdint>
+#include <vector>
+
+class AACDecoder {
+    public:
+        AACDecoder();
+        ~AACDecoder();
+        AACDecoder(const AACDecoder&) = delete;
+        AACDecoder& operator=(const AACDecoder&) = delete;
+        void decode_frame(uint8_t *data, size_t len);
+
+        struct peak_t { int16_t peak_left; int16_t peak_right; };
+        peak_t get_peaks();
+
+    private:
+        void decode_au(uint8_t *data, size_t len);
+        bool m_decoder_set_up = false;
+        int m_channels = 0;
+
+        peak_t m_peak;
+
+        HANDLE_AACDECODER m_handle;
+        std::vector<uint8_t> m_output_frame;
+};
+