src/engine/bufferscalers/enginebufferscalest.h


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#pragma once

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

class ReadAheadManager;

namespace soundtouch {
class SoundTouch;
}  // namespace soundtouch

// Uses libsoundtouch to scale audio.
class EngineBufferScaleST : public EngineBufferScale {
    Q_OBJECT
  public:
    explicit EngineBufferScaleST(
            ReadAheadManager* pReadAheadManager);
    ~EngineBufferScaleST() override;

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

    // Scale buffer.
    double scaleBuffer(
            CSAMPLE* pOutputBuffer,
            SINT iOutputBufferSize) override;

    // Flush buffer.
    void clear() override;

  private:
    void onSampleRateChanged() override;

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

    // SoundTouch time/pitch scaling lib
    std::unique_ptr<soundtouch::SoundTouch> m_pSoundTouch;

    // Temporary buffer for reading from the RAMAN.
    mixxx::SampleBuffer buffer_back;

    // Holds the playback direction.
    bool m_bBackwards;
};