ASampleRateConverter.h

#pragma once
 
#include <cstddef>
#include "AUI/Audio/ISoundInputStream.h"
#include "AUI/Util/APimpl.h"
#include "AUI/Traits/platform.h"
 
typedef struct soxr * soxr_t;
 
class ASampleRateConverter {
public:
   ASampleRateConverter(size_t requestedSampleRate, _<ISoundInputStream> stream);

   size_t convert(std::span<std::byte> dst);

   static constexpr ASampleFormat outputSampleFormat() {
       return aui::platform::current::is_mobile() ? ASampleFormat::I16 : ASampleFormat::I32;
   }
 
   [[nodiscard]]
   const _<ISoundInputStream>& source() const { return mSource; }
 
   ~ASampleRateConverter();
 
private:
   struct SoxrProcessResult {
       size_t bytesInUsed;
       size_t bytesOut;
   };
 
   SoxrProcessResult soxrProcess(std::span<std::byte> src, std::span<std::byte> dst);
 
   static constexpr size_t BUFFER_SIZE = 0x3000;
   static constexpr size_t INT32_BUFFER_SIZE = (BUFFER_SIZE / 3);
 
   struct AuxBuffer {
       size_t read(char* dst, size_t size);
 
       void write(const _<IInputStream>& source, size_t bytesToRead = BUFFER_SIZE);
 
       [[nodiscard]]
       size_t size() const;
 
       std::span<std::byte> span();

       void convertFormatToInt32();
 
       char buffer[BUFFER_SIZE];
       size_t begin = 0;
       size_t end = 0;
   };
 
 
 
   soxr_t mContext = nullptr;
   _<ISoundInputStream> mSource;
   AAudioFormat mInputFormat;
   AAudioFormat mOutputFormat;
   AuxBuffer mSourceBuffer;
};

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