added stub file for mp3 decoding

include/libnyquist/Mp3Decoder.h

@@ -0,0 +1,45 @@
+/*
+Copyright (c) 2019, Dimitri Diakopoulos All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#ifndef MP3_DECODER_H
+#define MP3_DECODER_H
+
+#include "AudioDecoder.h"
+
+namespace nqr
+{
+    
+struct Mp3Decoder final : public nqr::BaseDecoder
+{
+    Mp3Decoder() = default;
+    virtual ~Mp3Decoder() override {};
+    virtual void LoadFromPath(nqr::AudioData * data, const std::string & path) override final;
+    virtual void LoadFromBuffer(nqr::AudioData * data, const std::vector<uint8_t> & memory) override final;
+    virtual std::vector<std::string> GetSupportedFileExtensions() override final;
+};
+
+} // end namespace nqr
+
+#endif

src/AudioDecoder.cpp

@@ -31,6 +31,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include "VorbisDecoder.h"
 #include "OpusDecoder.h"
 #include "MusepackDecoder.h"
+#include "Mp3Decoder.h"
 
 using namespace nqr;
 
@@ -132,4 +133,5 @@ void NyquistIO::BuildDecoderTable()
     AddDecoderToTable(std::make_shared<VorbisDecoder>());
     AddDecoderToTable(std::make_shared<OpusDecoder>());
     AddDecoderToTable(std::make_shared<MusepackDecoder>());
+    AddDecoderToTable(std::make_shared<Mp3Decoder>());
 }

src/Mp3Decoder.cpp

@@ -0,0 +1,88 @@
+/*
+ Copyright (c) 2019, Dimitri Diakopoulos All rights reserved.
+ 
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are met:
+ 
+ * Redistributions of source code must retain the above copyright notice, this
+ list of conditions and the following disclaimer.
+ 
+ * Redistributions in binary form must reproduce the above copyright notice,
+ this list of conditions and the following disclaimer in the documentation
+ and/or other materials provided with the distribution.
+ 
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "Mp3Decoder.h"
+
+using namespace nqr;
+
+#include "mpc/mpcdec.h"
+#include "mpc/reader.h"
+#include "musepack/libmpcdec/decoder.h"
+#include "musepack/libmpcdec/internal.h"
+
+class Mp3Internal
+{
+ 
+    NO_MOVE(Mp3Internal);
+    AudioData * d;
+
+public:
+    
+    Mp3Internal(AudioData * d, const std::vector<uint8_t> & fileData) : d(d)
+    {
+        /*
+        d->sampleRate = (int) streamInfo.sample_freq;
+        d->channelCount = streamInfo.channels;
+        d->sourceFormat = MakeFormatForBits(32, true, false);
+        d->lengthSeconds = (double) mpc_streaminfo_get_length(&streamInfo);
+        
+        auto totalSamples = size_t(mpc_streaminfo_get_length_samples(&streamInfo));
+        d->samples.reserve(totalSamples * d->channelCount + (MPC_DECODER_BUFFER_LENGTH / sizeof(MPC_SAMPLE_FORMAT))); // demux writes in chunks
+        d->samples.resize(totalSamples * d->channelCount);
+        
+        if (!read_implementation())
+        {
+            throw std::runtime_error("could not read any data");
+        }
+        */
+    }
+    
+    size_t read_implementation()
+    {
+        return 0;
+    }
+
+    ~Mp3Internal() {}
+};
+
+//////////////////////
+// Public Interface //
+//////////////////////
+
+void Mp3Decoder::LoadFromPath(AudioData * data, const std::string & path)
+{
+    auto fileBuffer = nqr::ReadFile(path);
+    Mp3Internal decoder(data, fileBuffer.buffer);
+}
+
+void Mp3Decoder::LoadFromBuffer(AudioData * data, const std::vector<uint8_t> & memory)
+{
+    Mp3Internal decoder(data, memory);
+}
+
+std::vector<std::string> Mp3Decoder::GetSupportedFileExtensions()
+{
+    return {"mp3"};
+}