fix includes

client/decoder/decoder.hpp

@@ -0,0 +1,41 @@
+/***
+    This file is part of snapcast
+    Copyright (C) 2014-2019  Johannes Pohl
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#ifndef DECODER_H
+#define DECODER_H
+#include "common/sample_format.hpp"
+#include "message/codecHeader.h"
+#include "message/pcmChunk.h"
+#include <mutex>
+
+
+class Decoder
+{
+public:
+    Decoder(){};
+    virtual ~Decoder() = default;
+
+    virtual bool decode(msg::PcmChunk* chunk) = 0;
+    virtual SampleFormat setHeader(msg::CodecHeader* chunk) = 0;
+
+protected:
+    std::mutex mutex_;
+};
+
+
+#endif