TimeStamp TimeStamp::operator+(const TimeStamp & t) const {
int32_t sumSeconds = m_seconds + t.getSeconds();
int32_t sumMicroseconds = m_microseconds + t.getFractionalMicroseconds();
while (sumMicroseconds > 1000000L) {
sumSeconds++;
sumMicroseconds -= 1000000L;
}
return TimeStamp(sumSeconds, sumMicroseconds);
}
TimeStamp TimeStamp::operator-(const TimeStamp & t) const {
int32_t deltaSeconds = m_seconds - t.getSeconds();
int32_t deltaMicroseconds = m_microseconds - t.getFractionalMicroseconds();
while (deltaMicroseconds < 0) {
deltaSeconds--;
deltaMicroseconds += 1000000L;
}
return TimeStamp(deltaSeconds, deltaMicroseconds);
}
//This function should be called every tick/frame. This used the previous functions to
//Update time, get the current spectrum and the adaptive threshold and then does a check
//to see if a beat has occured. It also allows for some post-detection ignore clause.
//This function also does functions such as update the smoothing median list, create a
//timestamp object, update the lastBeatRegistered and checks to see if the song
//is still playing
bool BeatDetectorLite::update(float* left, float* right, int length) {
float* stereo = (float*) malloc(length * sizeof(float));
for(int i = 0; i < length; i++) {
stereo[i] = left[i] + right[i];
}
if(previousFFT == NULL) {
previousFFT = stereo;
return false;
}
beatThreshold = calculateFluxAndSmoothing(stereo);
//Beat detected
if (specFlux > beatThreshold && (clock() - timeBetween) > 350)
{
smootherValues.push_back(specFlux);
if (smootherValues.size() >= 5)
{
smootherValues.erase(smootherValues.begin());
}
timeBetween = clock();
TimeStamp* t = new TimeStamp(currentMinutes, currentSeconds, currentMillis, specFlux);
std::cout << "BEAT AT: " << t->getMinutes() << ":" << t->getSeconds() << ":" << t->getMilliseconds() << " -- BEAT FREQ: " << t->getFrequency() << " -- THRESHOLD: " << beatThreshold << std::endl;
lastBeatRegistered = t;
return true;
}
else if ((clock() - timeBetween) > 5000)
{
if (thresholdSmoother>0.4f)
thresholdSmoother -= 0.4f;
timeBetween = clock();
return false;
}
return false;
}