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#include "FrameRate.h"
using namespace Dasher;
CFrameRate::CFrameRate(CSettingsUser *pCreator) :
CSettingsUserObserver(pCreator) {
//Sampling parameters...
m_iFrames = 0;
m_iSamples = 1;
m_iTime = 0;
//try and carry on from where we left off at last run
HandleEvent(LP_X_LIMIT_SPEED);
//Sets m_dBitsAtLimX and m_iSteps
}
void CFrameRate::RecordFrame(unsigned long Time)
{
m_iFrames++;
// Update values once enough samples have been collected
if(m_iFrames == m_iSamples) {
unsigned long m_iTime2 = Time;
// If samples are collected in < 50ms, collect more
if(m_iTime2 - m_iTime < 50)
m_iSamples++;
// And if it's taking longer than > 80ms, collect fewer, down to a
// limit of 2
else if(m_iTime2 - m_iTime > 80) {
m_iSamples--;
if(m_iSamples < 2)
m_iSamples = 2;
}
// Calculate the framerate and reset framerate statistics for next
// sampling period
if(m_iTime2 - m_iTime > 0) {
double dFrNow = m_iFrames * 1000.0 / (m_iTime2 - m_iTime);
//LP_FRAMERATE records a decaying average, smoothed 50:50 with previous value
SetLongParameter(LP_FRAMERATE, long(GetLongParameter(LP_FRAMERATE) + (dFrNow*100))/2);
m_iTime = m_iTime2;
m_iFrames = 0;
DASHER_TRACEOUTPUT("Fr %f Steps %d Samples %d Time2 %d\n", dFrNow, m_iSteps, m_iSamples, m_iTime2);
}
}
}
void CFrameRate::HandleEvent(int iParameter) {
switch (iParameter) {
case LP_X_LIMIT_SPEED:
m_dBitsAtLimX = (log(static_cast<double>(CDasherModel::MAX_Y)) - log (2.*GetLongParameter(LP_X_LIMIT_SPEED)))/log(2.);
//fallthrough
case LP_MAX_BITRATE:
case LP_FRAMERATE:
//Calculate m_iSteps from the decaying-average framerate, as the number
// of steps that, at the X limit, will cause LP_MAX_BITRATE bits to be
// entered per second
m_iSteps = std::max(1,(int)(GetLongParameter(LP_FRAMERATE)*m_dBitsAtLimX/GetLongParameter(LP_MAX_BITRATE)));
}
}
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