msmcobalt/QCamera2/util/QCameraDisplay.h

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#ifndef __QCAMERADISPLAY_H__
#define __QCAMERADISPLAY_H__

#include <gui/DisplayEventReceiver.h>
#include <android/looper.h>
#include <utils/Looper.h>

namespace qcamera {

#define CAMERA_NUM_VSYNC_INTERVAL_HISTORY  6
#define NSEC_PER_MSEC 1000000LLU

class QCameraDisplay {
public:
    QCameraDisplay();
    ~QCameraDisplay();
    static int   vsyncEventReceiverCamera(int fd, int events, void* data);
    static void* vsyncThreadCamera(void * data);
    void         computeAverageVsyncInterval(nsecs_t currentVsyncTimeStamp);
    nsecs_t      computePresentationTimeStamp(nsecs_t frameTimeStamp);

private:
    pthread_t mVsyncThreadCameraHandle;
    nsecs_t   mVsyncTimeStamp;
    nsecs_t   mAvgVsyncInterval;
    nsecs_t   mOldTimeStamp;
    nsecs_t   mVsyncIntervalHistory[CAMERA_NUM_VSYNC_INTERVAL_HISTORY];
    nsecs_t   mVsyncHistoryIndex;
    nsecs_t   mAdditionalVsyncOffsetForWiggle;
    uint32_t  mThreadExit;
    // Tunable property. Increasing this will increase the frame delay and will loose
    // the real time display.
    uint32_t  mNum_vsync_from_vfe_isr_to_presentation_timestamp;
    // Tunable property. Set the time stamp x ns prior to expected vsync so that
    // it will be picked in that vsync
    nsecs_t  mSet_timestamp_num_ns_prior_to_vsync;
    // Tunable property for filtering timestamp wiggle when VFE ISR crosses
    // over MDP ISR over a period. Typical scenario is VFE is running at
    // 30.2 fps vs display running at 60 fps.
    nsecs_t  mVfe_and_mdp_freq_wiggle_filter_max_ns;
    nsecs_t  mVfe_and_mdp_freq_wiggle_filter_min_ns;

    android::DisplayEventReceiver  mDisplayEventReceiver;
};

}; // namespace qcamera

#endif /* __QCAMERADISPLAY_H__ */