PGMConverter.h

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/*
 * PGMConverter
 *
 * Object to convert a MythPlayer frame into a greyscale image.
 */
 
#ifndef PGMCONVERTER_H
#define PGMCONVERTER_H
 
extern "C" {
#include "libavcodec/avcodec.h"    /* AVFrame */
}
 
class MythPlayer;
class MythAVCopy;
class MythVideoFrame;
 
/*
 * PGM_CONVERT_GREYSCALE:
 *
 * If #define'd, perform a true greyscale conversion of "frame" in
 * PGMConverter::getImage .
 *
 * If #undef'd, just fake up a greyscale data structure. The "frame" data is
 * YUV data, and the Y channel is close enough for our purposes, and it's
 * faster than a full-blown true greyscale conversion.
 */
#define PGM_CONVERT_GREYSCALE
 
class PGMConverter
{
public:
    /* Ctor/dtor. */
    PGMConverter(void) = default;
    ~PGMConverter(void);
 
    int MythPlayerInited(const MythPlayer *player);
    const AVFrame *getImage(const MythVideoFrame *frame, long long frameno,
            int *pwidth, int *pheight);
    int reportTime(void);
 
private:
    long long       m_frameNo       {-1}; /* frame number */
    int             m_width         {-1}; /* frame dimensions */
    int             m_height        {-1}; /* frame dimensions */
    AVFrame         m_pgm           {};   /* grayscale frame */
#ifdef PGM_CONVERT_GREYSCALE
    std::chrono::microseconds  m_convertTime  {0us};
    bool            m_timeReported  {false};
    MythAVCopy     *m_copy          {nullptr};
#endif /* PGM_CONVERT_GREYSCALE */
};
 
#endif  /* !PGMCONVERTER_H */
 
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