c@243: /*
c@243:  *  SavedFeatureSegmenter.cpp
c@243:  *  soundbite
c@243:  *
c@243:  *  Created by Mark Levy on 23/03/2006.
c@243:  *  Copyright 2006 Centre for Digital Music, Queen Mary, University of London. All rights reserved.
c@243:  *
c@243:  */
c@243: 
c@243: #include <cfloat>
c@243: #include <cmath>
c@243: 
c@243: #include "SavedFeatureSegmenter.h"
c@243: #include "cluster_segmenter.h"
c@243: #include "segment.h"
c@243: 
c@243: SavedFeatureSegmenter::SavedFeatureSegmenter(SavedFeatureSegmenterParams params) : windowSize(params.windowSize),
c@243: hopSize(params.hopSize),
c@243: nHMMStates(params.nHMMStates),
c@243: nclusters(params.nclusters),
c@243: histogramLength(params.histogramLength),
c@243: neighbourhoodLimit(params.neighbourhoodLimit)
c@243: {
c@243: }
c@243: 
c@243: void SavedFeatureSegmenter::initialise(int fs)
c@243: {
c@243: 	samplerate = fs;
c@243: }
c@243: 
c@243: SavedFeatureSegmenter::~SavedFeatureSegmenter() 
c@243: {
c@243: }
c@243: 
c@243: void SavedFeatureSegmenter::segment(int m)
c@243: {
c@243: 	nclusters = m;
c@243: 	segment();
c@243: }
c@243: 
c@243: void SavedFeatureSegmenter::setFeatures(const vector<vector<double> >& f)
c@243: {
c@243: 	features = f;
c@243: }
c@243: 
c@243: void SavedFeatureSegmenter::segment()
c@243: {
c@243: 	// for now copy the features to a native array and use the existing C segmenter...
c@243: 	double** arrFeatures = new double*[features.size()];	
c@243: 	for (int i = 0; i < features.size(); i++)
c@243: 	{
c@243: 		arrFeatures[i] = new double[features[0].size()];	// allow space for the normalised envelope
c@243: 		for (int j = 0; j < features[0].size(); j++)
c@243: 			arrFeatures[i][j] = features[i][j];	
c@243: 	}
c@243: 	
c@243: 	q = new int[features.size()];
c@243: 	
c@243: 	cluster_segment(q, arrFeatures, features.size(), features[0].size(), nHMMStates, histogramLength, 
c@243: 						nclusters, neighbourhoodLimit);
c@243: 	// convert the cluster assignment sequence to a segmentation
c@243: 	makeSegmentation(q, features.size());		
c@243: 	
c@243: 	// de-allocate arrays
c@243: 	delete [] q;
c@243: 	for (int i = 0; i < features.size(); i++)
c@243: 		delete [] arrFeatures[i];
c@243: 	delete [] arrFeatures;
c@243: 	
c@243: 	// clear the features
c@243: 	clear();
c@243: }
c@243: 
c@243: void SavedFeatureSegmenter::makeSegmentation(int* q, int len)
c@243: {
c@243: 	segmentation.segments.clear();
c@243: 	segmentation.nsegtypes = nclusters;
c@243: 	segmentation.samplerate = samplerate;
c@243: 	
c@243: 	Segment segment;
c@243: 	segment.start = 0;
c@243: 	segment.type = q[0];
c@243: 	
c@243: 	for (int i = 1; i < len; i++)
c@243: 	{
c@243: 		if (q[i] != q[i-1])
c@243: 		{
c@243: 			segment.end = i * getHopsize();
c@243: 			segmentation.segments.push_back(segment);
c@243: 			segment.type = q[i];
c@243: 			segment.start = segment.end;
c@243: 		}
c@243: 	}
c@243: 	segment.end = len * getHopsize();
c@243: 	segmentation.segments.push_back(segment);
c@243: }
c@243: