BorderDetector.h

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/*
 * BorderDetector
 *
 * Attempt to infer content boundaries of an image by looking for rows and
 * columns of pixels whose values fall within some narrow range.
 *
 * Handle letterboxing, pillarboxing, and combinations of the two. Handle cases
 * where letterboxing embedded inside of pillarboxing (or vice versa) uses a
 * different filler color.
 */
 
#ifndef BORDERDETECTOR_H
#define BORDERDETECTOR_H
 
using AVFrame = struct AVFrame;
class MythPlayer;
class TemplateFinder;
 
class BorderDetector
{
public:
    /* Ctor/dtor. */
    BorderDetector(void);
 
    int MythPlayerInited(const MythPlayer *player);
    void setLogoState(TemplateFinder *finder);
 
    static const long long kUncached = -1;
    int getDimensions(const AVFrame *pgm, int pgmheight, long long frameno,
            int *prow, int *pcol, int *pwidth, int *pheight);
 
    int reportTime(void);
 
private:
    void getDimensionsReal(const AVFrame *pgm, int pgmheight, long long frameno);
    TemplateFinder         *m_logoFinder      {nullptr};
    const struct AVFrame   *m_logo            {nullptr};
    int                     m_logoRow         {-1};
    int                     m_logoCol         {-1};
    int                     m_logoWidth       {-1};
    int                     m_logoHeight      {-1};
 
    long long               m_frameNo         {-1}; /* frame number */
    int                     m_row             {-1}; /* content location */
    int                     m_col             {-1}; /* content location */
    int                     m_width           {-1}; /* content dimensions */
    int                     m_height          {-1}; /* content dimensions */
    bool                    m_isMonochromatic {false};
 
    /* Debugging. */
    int                     m_debugLevel      {0};
    std::chrono::microseconds m_analyzeTime   {0us};
    bool                    m_timeReported    {false};
};
 
#endif  /* !BORDERDETECTOR_H */
 
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