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#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "../Common/Common.h"
#include "AutoSpeedControl.h"
#include <cmath>
#include <cfloat>
#include <cstring>
using namespace Dasher;
CAutoSpeedControl::CAutoSpeedControl(CSettingsUser *pCreateFrom, CMessageDisplay *pMsgs)
: CSettingsUser(pCreateFrom), m_pMsgs(pMsgs) {
//scale #samples by #samples = m_dSamplesScale / (current bitrate) + m_dSampleOffset
m_dSampleScale = 1.5;
m_dSampleOffset = 1.3;
m_dMinRRate = 80.0;
m_dSensitivity = GetLongParameter(LP_AUTOSPEED_SENSITIVITY) / 100.0; //param only, no GUI!
//tolerance for automatic speed control
m_dTier1 = 0.0005; // should be arranged so that tier4 > tier3 > tier2 > tier1 !!!
m_dTier2 = 0.01;
m_dTier3 = 0.2;
m_dTier4 = 0.31;
//bitrate fractional changes for auto-speed control
m_dChange1 = 1.1;
m_dChange2 = 1.02;
m_dChange3 = 0.97;
m_dChange4 = 0.94;
//cap bitrate at...
m_dSpeedMax = 8.0;
m_dSpeedMin = 0.1;
//variance of two-centred-gaussians for adaptive radius
m_dSigma1 = 0.5;
m_dSigma2 = 0.05;
//Initialise auto-speed control
m_nSpeedCounter = 0;
m_dBitrate = double(round(GetLongParameter(LP_MAX_BITRATE) / 100.0));
UpdateMinRadius();
UpdateSampleSize(GetLongParameter(LP_FRAMERATE) / 100.0);
}
////////////////////////////////////////////////
///
/// Change max bitrate based on variance of angle
/// in dasher space.
///
/////////////////////////////////////////////////
inline double CAutoSpeedControl::UpdateBitrate()
{
double var = Variance();
if(var < m_dTier1)
{
m_dBitrate *= m_dChange1;
}
else if(var < m_dTier2)
{
m_dBitrate *= m_dChange2;
}
else if(var > m_dTier4) //Tier 4 comes before tier 3 because tier4 > tier3 !!!
{
m_dBitrate *= m_dChange4;
}
else if(var > m_dTier3)
{
m_dBitrate *= m_dChange3;
}
//else if( in the middle )
// nothing happens! ;
//always keep bitrate values sane
if(m_dBitrate > m_dSpeedMax)
{
m_dBitrate = m_dSpeedMax;
}
else if(m_dBitrate < m_dSpeedMin)
{
m_dBitrate = m_dSpeedMin;
}
return m_dBitrate;
}
///////////////////////////////////////////////
///
/// Finds variance for automatic speed control
///
//////////////////////////////////////////////
inline double CAutoSpeedControl::Variance()
{
double avgcos, avgsin;
avgsin = avgcos = 0.0;
DOUBLE_DEQUE::iterator i;
// find average of cos(theta) and sin(theta)
for(i = m_dequeAngles.begin(); i != m_dequeAngles.end(); i++) {
avgcos += cos(*i);
avgsin += sin(*i);
}
avgcos /= (1.0 * m_dequeAngles.size());
avgsin /= (1.0 * m_dequeAngles.size());
//return variance (see dasher/Doc/speedcontrol.tex)
return -log(avgcos * avgcos + avgsin * avgsin);
}
//////////////////////////////////////////////////////////////////////
///
/// The number of samples depends on the clock rate of the
/// machine (framerate) and the user's speed (bitrate). See
/// speedcontrol.tex in dasher/Doc/ dir.
///
/////////////////////////////////////////////////////////////////////
inline int CAutoSpeedControl::UpdateSampleSize(double dFrameRate)
{
// for the purposes of this function
// we don't care exactly how slow we're going
// *really* low speeds are ~ equivalent?
double dBitrate = std::max(1.0,m_dBitrate);
double dSpeedSamples = dFrameRate * (m_dSampleScale / dBitrate + m_dSampleOffset);
m_nSpeedSamples = int(round(dSpeedSamples));
return m_nSpeedSamples;
}
/////////////////////////////////////////////////////////////
///
/// double UpdateMinRadius() - find adaptive min radius for
/// auto-speed control. Calculated by DJCM's
/// mixture-of-2-centred-gaussians model.
///
///////////////////////////////////////////////////////////
inline double CAutoSpeedControl::UpdateMinRadius()
{
m_dMinRadius = sqrt( log( (m_dSigma2 * m_dSigma2) / (m_dSigma1 * m_dSigma1) ) /
( 1 / (m_dSigma1 * m_dSigma1) - 1 / (m_dSigma2 * m_dSigma2)) );
return m_dMinRadius;
}
//////////////////////////////////////////////////////////////
///
/// NB: updates VARIANCES of two populations of
/// mixture-of-2-centred-Gaussians model!
///
//////////////////////////////////////////////////////////////
inline void CAutoSpeedControl::UpdateSigmas(double r, double dFrameRate)
{
double dSamples = m_dMinRRate* dFrameRate / m_dBitrate;
if(r > m_dMinRadius)
m_dSigma1 = m_dSigma1 - (m_dSigma1 - r * r) / dSamples;
else
m_dSigma2 = m_dSigma2 - (m_dSigma2 - r * r) / dSamples;
}
/////////////////////////////////////////////////////////////////
///
/// AUTOMATIC SPEED CONTROL, CEH 7/05: Analyse variance of angle
/// mouse position makes with +ve x-axis in Dasher-space
///
////////////////////////////////////////////////////////////////
void CAutoSpeedControl::SpeedControl(myint iDasherX, myint iDasherY, CDasherView *pView) {
if(GetBoolParameter(BP_AUTO_SPEEDCONTROL)) {
// Coordinate transforms:
double r,theta;
pView->Dasher2Polar(iDasherX, iDasherY, r, theta);
m_dBitrate = GetLongParameter(LP_MAX_BITRATE) / 100.0; // stored as long(round(true bitrate * 100))
double dFrameRate = GetLongParameter(LP_FRAMERATE) / 100.0;
UpdateSigmas(r, dFrameRate);
// Data collection:
if(r > m_dMinRadius && fabs(theta) < 1.25) {
m_nSpeedCounter++;
m_dequeAngles.push_back(theta);
while(m_dequeAngles.size() > m_nSpeedSamples) {
m_dequeAngles.pop_front();
}
}
m_dSensitivity = GetLongParameter(LP_AUTOSPEED_SENSITIVITY) / 100.0;
if(m_nSpeedCounter > round(m_nSpeedSamples / m_dSensitivity)) {
//do speed control every so often!
UpdateSampleSize(dFrameRate);
UpdateMinRadius();
UpdateBitrate();
long lBitrateTimes100 = long(round(m_dBitrate * 100)); //Dasher settings want long numerical parameters
if (lBitrateTimes100 != GetLongParameter(LP_MAX_BITRATE)) {
const char *msg((lBitrateTimes100 > GetLongParameter(LP_MAX_BITRATE)) ?
_("Auto-increasing speed to %0.2f") : _("Auto-decreasing speed to %0.2f"));
char *buf(new char[strlen(msg) + 5]);
sprintf(buf, msg, (lBitrateTimes100/100.0));
m_pMsgs->Message(buf,false);
delete buf;
SetLongParameter(LP_MAX_BITRATE, lBitrateTimes100);
}
m_nSpeedCounter = 0;
}
}
}
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