Add null encoder for use with meta streams

server/encoder/null_encoder.cpp

@@ -0,0 +1,48 @@
+/***
+    This file is part of snapcast
+    Copyright (C) 2014-2020  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/>.
+***/
+
+#include "null_encoder.hpp"
+
+
+namespace encoder
+{
+
+
+NullEncoder::NullEncoder(const std::string& codecOptions) : Encoder(codecOptions)
+{
+    headerChunk_.reset(new msg::CodecHeader("null"));
+}
+
+
+void NullEncoder::encode(const msg::PcmChunk& chunk)
+{
+    std::ignore = chunk;
+}
+
+
+void NullEncoder::initEncoder()
+{
+}
+
+
+std::string NullEncoder::name() const
+{
+    return "null";
+}
+
+} // namespace encoder