add flac decoding to correctly add flac sounds to sound banks

src/ObjCommon/Sound/FlacDecoder.cpp

@@ -0,0 +1,77 @@
+#include <foxen/flac.h>
+#include "FlacDecoder.h"
+
+class fx_flac_raii
+{
+public:
+    fx_flac_raii()
+    {
+        ptr = FX_FLAC_ALLOC_DEFAULT();
+    }
+
+    ~fx_flac_raii()
+    {
+        free(ptr);
+    }
+
+    operator fx_flac_t* ()
+    {
+        return ptr;
+    }
+
+private: 
+    fx_flac_t* ptr;
+};
+
+class FlacDecoderImpl : public FlacDecoder
+{
+private:
+    void* m_data;
+    size_t m_length;
+    std::unique_ptr<fx_flac_raii> m_flac;
+
+public:
+    explicit FlacDecoderImpl(void* data, size_t length)
+        : m_data(data),
+          m_length(length)
+    {
+
+    }
+
+    unsigned int GetFrameCount() override
+    {
+        return static_cast<unsigned int>(fx_flac_get_streaminfo(*m_flac.get(), FLAC_KEY_N_SAMPLES));
+    }
+
+    unsigned int GetFrameRate() override
+    {
+        return static_cast<unsigned int>(fx_flac_get_streaminfo(*m_flac.get(), FLAC_KEY_SAMPLE_RATE));
+    }
+
+    unsigned int GetNumChannels() override 
+    {
+        return static_cast<unsigned int>(fx_flac_get_streaminfo(*m_flac.get(), FLAC_KEY_N_CHANNELS));
+    }
+
+    bool Decode() override
+    {
+        m_flac = std::make_unique<fx_flac_raii>();
+
+        while (true)
+        {
+            auto res = fx_flac_process(*m_flac.get(), reinterpret_cast<uint8_t*>(m_data), &m_length, nullptr, nullptr);
+            if (res == FLAC_ERR)
+                return false;
+
+            if (res == FLAC_END_OF_METADATA)
+                break;
+        }
+
+        return true;
+    }
+};
+
+std::unique_ptr<FlacDecoder> FlacDecoder::Create(void* data, size_t length)
+{
+    return std::make_unique<FlacDecoderImpl>(data, length);
+}

src/ObjCommon/Sound/FlacDecoder.h

@@ -0,0 +1,21 @@
+#pragma once
+#include <istream>
+
+class FlacDecoder
+{
+public:
+    FlacDecoder() = default;
+    virtual ~FlacDecoder() = default;
+
+    FlacDecoder(const FlacDecoder& other) = default;
+    FlacDecoder(FlacDecoder&& other) noexcept = default;
+    FlacDecoder& operator=(const FlacDecoder& other) = default;
+    FlacDecoder& operator=(FlacDecoder&& other) noexcept = default;
+
+    virtual bool Decode() = 0;
+    virtual unsigned int GetFrameCount() = 0;
+    virtual unsigned int GetFrameRate() = 0;
+    virtual unsigned int GetNumChannels() = 0;
+
+    static std::unique_ptr<FlacDecoder> Create(void* data, size_t length);
+};