MovingAverage Class Reference

#include <decklink_drift_fix.hpp>

Collaboration diagram for MovingAverage:

Public Member Functions
	MovingAverage (unsigned int period)
	~MovingAverage ()
void	add (double val)
double	avg () const
ptrdiff_t	filled ()
double	getTotal () const
ptrdiff_t	size () const

Private Member Functions
void	inc (double *&p)

Private Attributes
double *	head
unsigned int	period
double *	tail
double	total
double *	window

Detailed Description

Definition at line 58 of file decklink_drift_fix.hpp.

Constructor & Destructor Documentation

MovingAverage()

MovingAverage::MovingAverage ( unsigned int period )

inline

Definition at line 60 of file decklink_drift_fix.hpp.

                                           :
                period(period), 
                window(new double[period]), 
                head(NULL), 
                tail(NULL),
                total(0) {
                
                assert(period >= 1);
        }

References period.

~MovingAverage()

MovingAverage::~MovingAverage ( )

inline

Definition at line 70 of file decklink_drift_fix.hpp.

                         {
                delete[] window;
        }

References window.

Member Function Documentation

add()

void MovingAverage::add ( double val )

inline

Definition at line 74 of file decklink_drift_fix.hpp.

                             {
                // Init
                if (head == NULL) {
                        head = window;
                        *head = val;
                        tail = head;
                        inc(tail);
                        total = val;
                        return;
                }
                // full?
                if (head == tail) {
                        total -= *head;
                        inc(head);
                }
 
                *tail = val;
                inc(tail);
                total += val;
        }

References head, inc(), tail, total, val, and window.

Referenced by DecklinkAudioSummary::calculate_missing(), and AudioDriftFixer::update().

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avg()

double MovingAverage::avg ( ) const

inline

Definition at line 97 of file decklink_drift_fix.hpp.

                           {
                ptrdiff_t size = this->size();
                if (size == 0) {
                        return 0; // No entries => 0 average
                }
                return total / (double)size; 
        }

References size(), and total.

Referenced by DecklinkAudioSummary::calculate_missing(), AudioDriftFixer::get_buffer_avg(), DecklinkAudioSummary::report(), and AudioDriftFixer::update().

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filled()

ptrdiff_t MovingAverage::filled ( )

inline

Definition at line 113 of file decklink_drift_fix.hpp.

                          {
                bool filled = false;
                if (this->size() >= (ptrdiff_t) this->period ){
                        filled = true;
                }
                return filled;
        }

References filled(), period, and size().

Referenced by DecklinkAudioSummary::calculate_missing(), filled(), and AudioDriftFixer::update().

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getTotal()

double MovingAverage::getTotal ( ) const

inline

Definition at line 121 of file decklink_drift_fix.hpp.

                                {
                return total;
        }

References total.

inc()

void MovingAverage::inc ( double *& p )

inlineprivate

Definition at line 132 of file decklink_drift_fix.hpp.

                             {
                if (++p >= window + period) {
                        p = window;
                }
        }

References period, and window.

Referenced by add().

size()

ptrdiff_t MovingAverage::size ( ) const

inline

Definition at line 105 of file decklink_drift_fix.hpp.

                               {
                if (head == NULL)
                        return 0;
                if (head == tail)
                        return period;
                return (period + tail - head) % period;
        }

References head, period, and tail.

Referenced by avg(), and filled().

Member Data Documentation

head

double* MovingAverage::head

private

Definition at line 128 of file decklink_drift_fix.hpp.

Referenced by add(), and size().

period

unsigned int MovingAverage::period

private

Definition at line 126 of file decklink_drift_fix.hpp.

Referenced by MovingAverage(), filled(), inc(), and size().

tail

double* MovingAverage::tail

private

Definition at line 129 of file decklink_drift_fix.hpp.

Referenced by add(), and size().

total

double MovingAverage::total

private

Definition at line 130 of file decklink_drift_fix.hpp.

Referenced by add(), avg(), and getTotal().

window

double* MovingAverage::window

private

Definition at line 127 of file decklink_drift_fix.hpp.

Referenced by ~MovingAverage(), add(), and inc().

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The documentation for this class was generated from the following file:

• src/video_display/decklink_drift_fix.hpp