Add null encoder for use with meta streams

server/encoder/encoder_factory.cpp

@@ -17,6 +17,7 @@
 ***/
 
 #include "encoder_factory.hpp"
+#include "null_encoder.hpp"
 #include "pcm_encoder.hpp"
 #if defined(HAS_OGG) && defined(HAS_VORBIS) && defined(HAS_VORBIS_ENC)
 #include "ogg_encoder.hpp"
@@ -48,6 +49,8 @@ std::unique_ptr<Encoder> EncoderFactory::createEncoder(const std::string& codecS
     }
     if (codec == "pcm")
         return std::make_unique<PcmEncoder>(codecOptions);
+    else if (codec == "null")
+        return std::make_unique<NullEncoder>(codecOptions);
 #if defined(HAS_OGG) && defined(HAS_VORBIS) && defined(HAS_VORBIS_ENC)
     else if (codec == "ogg")
         return std::make_unique<OggEncoder>(codecOptions);

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

server/encoder/null_encoder.hpp

@@ -0,0 +1,39 @@
+/***
+    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/>.
+***/
+
+#ifndef NULL_ENCODER_HPP
+#define NULL_ENCODER_HPP
+#include "encoder.hpp"
+
+namespace encoder
+{
+
+class NullEncoder : public Encoder
+{
+public:
+    NullEncoder(const std::string& codecOptions = "");
+    void encode(const msg::PcmChunk& chunk) override;
+    std::string name() const override;
+
+protected:
+    void initEncoder() override;
+};
+
+} // namespace encoder
+
+#endif