ResampleHQ.hh

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#ifndef RESAMPLEHQ_HH
#define RESAMPLEHQ_HH
 
#include "ResampleAlgo.hh"
#include <cstdint>
#include <span>
#include <vector>
 
namespace openmsx {
 
class DynamicClock;
class ResampledSoundDevice;
 
template<unsigned CHANNELS>
class ResampleHQ final : public ResampleAlgo
{
public:
        static constexpr size_t TAB_LEN = 4096;
        static constexpr size_t HALF_TAB_LEN = TAB_LEN / 2;
 
public:
        ResampleHQ(ResampledSoundDevice& input, const DynamicClock& hostClock);
        ResampleHQ(const ResampleHQ&) = delete;
        ResampleHQ(ResampleHQ&&) = delete;
        ResampleHQ& operator=(const ResampleHQ&) = delete;
        ResampleHQ& operator=(ResampleHQ&&) = delete;
        ~ResampleHQ() override;
 
        bool generateOutputImpl(float* dataOut, size_t num,
                                EmuTime::param time) override;
 
private:
        void calcOutput(float pos, float* output);
        void prepareData(unsigned emuNum);
 
private:
        const DynamicClock& hostClock;
        const float ratio;
        unsigned bufStart;
        unsigned bufEnd;
        unsigned nonzeroSamples = 0;
        unsigned filterLen;
        std::vector<float> buffer;
        float* table;
        std::span<const int16_t, HALF_TAB_LEN> permute;
};
 
} // namespace openmsx
 
#endif