void GLAnalyzer2::analyze(const Scope& s) {
bool haveNoData = s.empty();
// if we're going into pause mode, clear timers.
if (!show.paused && haveNoData) show.pauseTimer = 0.0;
// if we have got data, interpolate it (asking myself why I'm doing it here..)
if (!(show.paused = haveNoData)) {
int bands = s.size(), lowbands = bands / 4, hibands = bands / 3,
midbands = bands - lowbands - hibands;
Q_UNUSED(midbands);
float currentEnergy = 0, currentMeanBand = 0, maxValue = 0;
for (int i = 0; i < bands; i++) {
float value = s[i];
currentEnergy += value;
currentMeanBand += (float)i * value;
if (value > maxValue) maxValue = value;
}
frame.silence = currentEnergy < 0.001;
if (!frame.silence) {
frame.meanBand = 100.0 * currentMeanBand / (currentEnergy * bands);
currentEnergy = 100.0 * currentEnergy / (float)bands;
frame.dEnergy = currentEnergy - frame.energy;
frame.energy = currentEnergy;
// printf( "%d [%f :: %f ]\t%f \n", bands, frame.energy,
// frame.meanBand, maxValue );
} else
frame.energy = 0.0;
}
// update the frame
updateGL();
}
void GLAnalyzer3::analyze( const Scope &s )
{
// compute the dTime since the last call
timeval tv;
gettimeofday( &tv, NULL );
double currentTime = (double)tv.tv_sec + (double)tv.tv_usec/1000000.0;
show.dT = currentTime - show.timeStamp;
show.timeStamp = currentTime;
// compute energy integrating frame's spectrum
if ( !s.empty() )
{
int bands = s.size();
float currentEnergy = 0,
maxValue = 0;
// integrate spectrum -> energy
for ( int i = 0; i < bands; i++ )
{
float value = s[i];
currentEnergy += value;
if ( value > maxValue )
maxValue = value;
}
currentEnergy *= 100.0 / (float)bands;
// emulate a peak detector: currentEnergy -> peakEnergy (3tau = 30 seconds)
show.peakEnergy = 1.0 + ( show.peakEnergy - 1.0 ) * exp( - show.dT / 10.0 );
if ( currentEnergy > show.peakEnergy )
show.peakEnergy = currentEnergy;
// check for silence
frame.silence = currentEnergy < 0.001;
// normalize frame energy against peak energy and compute frame stats
currentEnergy /= show.peakEnergy;
frame.dEnergy = currentEnergy - frame.energy;
frame.energy = currentEnergy;
} else
frame.silence = true;
// update the frame
updateGL();
}
