#ifndef ENGINEBUFFERSCALERUBBERBAND_H
#define ENGINEBUFFERSCALERUBBERBAND_H

#include "engine/enginebufferscale.h"
#include "util/memory.h"

namespace RubberBand {
class RubberBandStretcher;
}  // namespace RubberBand

class ReadAheadManager;

// Uses librubberband to scale audio.  This class is not thread safe.
class EngineBufferScaleRubberBand : public EngineBufferScale {
    Q_OBJECT
  public:
    explicit EngineBufferScaleRubberBand(
            ReadAheadManager* pReadAheadManager);
    ~EngineBufferScaleRubberBand() override;

    void setScaleParameters(double base_rate,
                            double* pTempoRatio,
                            double* pPitchRatio) override;

    void setSampleRate(SINT iSampleRate) override;

    double scaleBuffer(
            CSAMPLE* pOutputBuffer,
            SINT iOutputBufferSize) override;

    // Flush buffer.
    void clear() override;

  private:
    // Reset RubberBand library with new audio signal
    void initRubberBand();

    void deinterleaveAndProcess(const CSAMPLE* pBuffer, SINT frames, bool flush);
    SINT retrieveAndDeinterleave(CSAMPLE* pBuffer, SINT frames);

    // The read-ahead manager that we use to fetch samples
    ReadAheadManager* m_pReadAheadManager;

    std::unique_ptr<RubberBand::RubberBandStretcher> m_pRubberBand;

    CSAMPLE* m_retrieve_buffer[2];
    CSAMPLE* m_buffer_back;

    // Holds the playback direction
    bool m_bBackwards;
};


#endif /* ENGINEBUFFERSCALERUBBERBAND_H */