Add null decoder

client/CMakeLists.txt

@@ -5,6 +5,7 @@ set(CLIENT_SOURCES
     stream.cpp
     time_provider.cpp
     decoder/pcm_decoder.cpp
+    decoder/null_decoder.cpp
     player/player.cpp
     player/file_player.cpp)
 

client/controller.cpp

@@ -25,6 +25,7 @@
 
 // local headers
 #include "decoder/pcm_decoder.hpp"
+#include "decoder/null_decoder.hpp"
 #if defined(HAS_OGG) && (defined(HAS_TREMOR) || defined(HAS_VORBIS))
 #include "decoder/ogg_decoder.hpp"
 #endif
@@ -185,6 +186,8 @@ void Controller::getNextMessage()
             else if (headerChunk_->codec == "opus")
                 decoder_ = make_unique<decoder::OpusDecoder>();
 #endif
+            else if (headerChunk_->codec == "null")
+                decoder_ = make_unique<decoder::NullDecoder>();
             else
                 throw SnapException("codec not supported: \"" + headerChunk_->codec + "\"");
 

client/decoder/null_decoder.cpp

@@ -0,0 +1,52 @@
+/***
+    This file is part of snapcast
+    Copyright (C) 2014-2023  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/>.
+***/
+
+// prototype/interface header file
+#include "null_decoder.hpp"
+
+// local headers
+#include "common/aixlog.hpp"
+#include "common/endian.hpp"
+#include "common/snap_exception.hpp"
+
+// 3rd party headers
+
+// standard headers
+
+
+namespace decoder
+{
+
+NullDecoder::NullDecoder() : Decoder()
+{
+}
+
+
+bool NullDecoder::decode(msg::PcmChunk* /*chunk*/)
+{
+    return true;
+}
+
+
+SampleFormat NullDecoder::setHeader(msg::CodecHeader* chunk)
+{
+    std::ignore = chunk;
+    return {48000, 16, 2};
+}
+
+} // namespace decoder

client/decoder/null_decoder.hpp

@@ -0,0 +1,36 @@
+/***
+    This file is part of snapcast
+    Copyright (C) 2014-2023  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/>.
+***/
+
+#pragma once
+
+// local headers
+#include "decoder.hpp"
+
+
+namespace decoder
+{
+
+class NullDecoder : public Decoder
+{
+public:
+    NullDecoder();
+    bool decode(msg::PcmChunk* chunk) override;
+    SampleFormat setHeader(msg::CodecHeader* chunk) override;
+};
+
+} // namespace decoder