Move utility classes from common to own static lib

src/util/wav_writer.h

@@ -0,0 +1,34 @@
+#pragma once
+#include "common/types.h"
+#include <cstdio>
+
+namespace Common {
+
+class WAVWriter
+{
+public:
+  WAVWriter();
+  ~WAVWriter();
+
+  ALWAYS_INLINE u32 GetSampleRate() const { return m_sample_rate; }
+  ALWAYS_INLINE u32 GetNumChannels() const { return m_num_channels; }
+  ALWAYS_INLINE u32 GetNumFrames() const { return m_num_frames; }
+  ALWAYS_INLINE bool IsOpen() const { return (m_file != nullptr); }
+
+  bool Open(const char* filename, u32 sample_rate, u32 num_channels);
+  void Close();
+
+  void WriteFrames(const s16* samples, u32 num_frames);
+
+private:
+  using SampleType = s16;
+
+  bool WriteHeader();
+
+  std::FILE* m_file = nullptr;
+  u32 m_sample_rate = 0;
+  u32 m_num_channels = 0;
+  u32 m_num_frames = 0;
+};
+
+} // namespace Common