annotate Agent.cpp @ 8:f04f87b5e643

Add agent list class, and continue plodding through

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
  Vamp feature extraction plugin for the BeatRoot beat tracker.

  Centre for Digital Music, Queen Mary, University of London.
  This file copyright 2011 Simon Dixon, Chris Cannam and QMUL.
    
  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License as
  published by the Free Software Foundation; either version 2 of the
  License, or (at your option) any later version.  See the file
  COPYING included with this distribution for more information.
*/

#include "Agent.h"
#include "BeatTracker.h"

double Agent::POST_MARGIN_FACTOR = 0.3;
double Agent::PRE_MARGIN_FACTOR = 0.15;
const double Agent::INNER_MARGIN = 0.040;
double Agent::MAX_CHANGE = 0.2;
double Agent::CONF_FACTOR = 0.5;
const double Agent::DEFAULT_CORRECTION_FACTOR = 50.0;
const double Agent::DEFAULT_EXPIRY_TIME = 10.0;

int Agent::idCounter = 0;

double Agent::innerMargin = 0.0;
double Agent::outerMargin = 0.0;
double Agent::correctionFactor = 0.0;
double Agent::expiryTime = 0.0;
double Agent::decayFactor = 0.0;

bool Agent::considerAsBeat(Event e, AgentList &a) {
    double err;
    if (beatTime < 0) {	// first event
	accept(e, 0, 1);
	return true;
    } else {			// subsequent events
	if (e.time - events.l.getLast().keyDown > expiryTime) {
	    phaseScore = -1.0;	// flag agent to be deleted
	    return false;
	}
	double beats = nearbyint((e.time - beatTime) / beatInterval);
	err = e.time - beatTime - beats * beatInterval;
	if ((beats > 0) && (-preMargin <= err) && (err <= postMargin)) {
	    if (fabs(err) > innerMargin)	// Create new agent that skips this
		a.push_back(Agent(*this));	//  event (avoids large phase jump)
	    accept(e, err, (int)beats);
	    return true;
	}
    }
    return false;
} // considerAsBeat()


void fillBeats(double start) {
    double prevBeat = 0, nextBeat, currentInterval, beats;
    EventList::iterator list = events.begin();
    if (list != events.end()) {
	++list;
	prevBeat = list->time;
	--list;
    }
    for ( ; list != events.end(); ++list) {
	++list;
	nextBeat = list->time;
	--list;
	beats = nearbyint((nextBeat - prevBeat) / beatInterval - 0.01); //prefer slow
	currentInterval = (nextBeat - prevBeat) / beats;
	for ( ; (nextBeat > start) && (beats > 1.5); beats--) {
	    prevBeat += currentInterval;
	    //!!! need to insert this event after current itr
	    list.add(BeatTracker::newBeat(prevBeat, 0));	// more than once OK??
	}
	prevBeat = nextBeat;
    }
} // fillBeats()