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update qm-dsp library

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This commit is contained in:
Robin Gareus 2016-10-06 00:16:44 +02:00
parent 2a27cc4758
commit f68d2e06bc
100 changed files with 58968 additions and 55091 deletions
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60
libs/qm-dsp/dsp/tempotracking/TempoTrackV2.cpp
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@ -91,10 +91,17 @@ TempoTrackV2::filter_df(d_vec_t &df)
}
// MEPD 28/11/12
// This function now allows for a user to specify an inputtempo (in BPM)
// and a flag "constraintempo" which replaces the general rayleigh weighting for periodicities
// with a gaussian which is centered around the input tempo
// Note, if inputtempo = 120 and constraintempo = false, then functionality is
// as it was before
void
TempoTrackV2::calculateBeatPeriod(const vector<double> &df,
vector<double> &beat_period,
vector<double> &tempi)
vector<double> &tempi,
double inputtempo, bool constraintempo)
{
// to follow matlab.. split into 512 sample frames with a 128 hop size
// calculate the acf,
@ -103,13 +110,42 @@ TempoTrackV2::calculateBeatPeriod(const vector<double> &df,
// and get best path
unsigned int wv_len = 128;
double rayparam = 43.;
// MEPD 28/11/12
// the default value of inputtempo in the beat tracking plugin is 120
// so if the user specifies a different inputtempo, the rayparam will be updated
// accordingly.
// note: 60*44100/512 is a magic number
// this might (will?) break if a user specifies a different frame rate for the onset detection function
double rayparam = (60*44100/512)/inputtempo;
// these debug statements can be removed.
// std::cerr << "inputtempo" << inputtempo << std::endl;
// std::cerr << "rayparam" << rayparam << std::endl;
// std::cerr << "constraintempo" << constraintempo << std::endl;
// make rayleigh weighting curve
d_vec_t wv(wv_len);
for (unsigned int i=0; i<wv.size(); i++)
// check whether or not to use rayleigh weighting (if constraintempo is false)
// or use gaussian weighting it (constraintempo is true)
if (constraintempo)
{
wv[i] = (static_cast<double> (i) / pow(rayparam,2.)) * exp((-1.*pow(-static_cast<double> (i),2.)) / (2.*pow(rayparam,2.)));
for (unsigned int i=0; i<wv.size(); i++)
{
// MEPD 28/11/12
// do a gaussian weighting instead of rayleigh
wv[i] = exp( (-1.*pow((static_cast<double> (i)-rayparam),2.)) / (2.*pow(rayparam/4.,2.)) );
}
}
else
{
for (unsigned int i=0; i<wv.size(); i++)
{
// MEPD 28/11/12
// standard rayleigh weighting over periodicities
wv[i] = (static_cast<double> (i) / pow(rayparam,2.)) * exp((-1.*pow(-static_cast<double> (i),2.)) / (2.*pow(rayparam,2.)));
}
}
// beat tracking frame size (roughly 6 seconds) and hop (1.5 seconds)
@ -397,10 +433,14 @@ TempoTrackV2::normalise_vec(d_vec_t &df)
}
}
// MEPD 28/11/12
// this function has been updated to allow the "alpha" and "tightness" parameters
// of the dynamic program to be set by the user
// the default value of alpha = 0.9 and tightness = 4
void
TempoTrackV2::calculateBeats(const vector<double> &df,
const vector<double> &beat_period,
vector<double> &beats)
vector<double> &beats, double alpha, double tightness)
{
if (df.empty() || beat_period.empty()) return;
@ -414,8 +454,12 @@ TempoTrackV2::calculateBeats(const vector<double> &df,
backlink[i] = -1;
}
double tightness = 4.;
double alpha = 0.9;
//double tightness = 4.;
//double alpha = 0.9;
// MEPD 28/11/12
// debug statements that can be removed.
// std::cerr << "alpha" << alpha << std::endl;
// std::cerr << "tightness" << tightness << std::endl;
// main loop
for (unsigned int i=0; i<localscore.size(); i++)
@ -462,7 +506,7 @@ TempoTrackV2::calculateBeats(const vector<double> &df,
int startpoint = get_max_ind(tmp_vec) + cumscore.size() - beat_period[beat_period.size()-1] ;
// can happen if no results obtained earlier (e.g. input too short)
if (startpoint >= backlink.size()) startpoint = backlink.size()-1;
if (startpoint >= (int)backlink.size()) startpoint = backlink.size()-1;
// USE BACKLINK TO GET EACH NEW BEAT (TOWARDS THE BEGINNING OF THE FILE)
// BACKTRACKING FROM THE END TO THE BEGINNING.. MAKING SURE NOT TO GO BEFORE SAMPLE 0