SceneChangeDetector.h

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/*
 * SceneChangeDetector
 *
 * Detect scene changes based on histogram analysis.
 */
 
#ifndef SCENECHANGEDETECTOR_H
#define SCENECHANGEDETECTOR_H
 
#include <QString>
 
#include "FrameAnalyzer.h"
 
using AVFrame = struct AVFrame;
class HistogramAnalyzer;
 
class SceneChangeDetector : public FrameAnalyzer
{
public:
    SceneChangeDetector(std::shared_ptr<HistogramAnalyzer> ha, const QString& debugdir);
    virtual void deleteLater(void) {};
 
    /* FrameAnalyzer interface. */
    const char *name(void) const override // FrameAnalyzer
        { return "SceneChangeDetector"; }
    enum analyzeFrameResult MythPlayerInited(MythPlayer *player,
            long long nframes) override; // FrameAnalyzer
    enum analyzeFrameResult analyzeFrame(const MythVideoFrame *frame,
            long long frameno, long long *pNextFrame) override; // FrameAnalyzer
    int finished(long long nframes, bool final) override; // FrameAnalyzer
    int reportTime(void) const override; // FrameAnalyzer
    FrameMap GetMap(unsigned int /*index*/) const override // FrameAnalyzer
        { return m_changeMap; }
 
    /* SceneChangeDetector interface. */
    const FrameAnalyzer::FrameMap *getChanges(void) const { return &m_changeMap; }
 
    struct scenechange_data {
        unsigned char   color;
        unsigned char   frequency;
    };
    using SceneChangeData = std::array<scenechange_data,UCHAR_MAX + 1>;
 
  protected:
    ~SceneChangeDetector(void) override = default;
 
  private:
    std::shared_ptr<HistogramAnalyzer> m_histogramAnalyzer {nullptr};
    float                   m_fps                {0.0F};
 
    /* per-frame info */
    std::vector<SceneChangeData> m_scData;
    std::vector<uint16_t>        m_scDiff;
 
    FrameAnalyzer::FrameMap m_changeMap;
 
    /* Debugging */
    int                     m_debugLevel         {0};
    QString                 m_debugData;            /* filename */
    bool                    m_debugSceneChange   {false};
    bool                    m_sceneChangeDone    {false};
};
 
#endif  /* !SCENECHANGEDETECTOR_H */
 
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