diff dsp/segmentation/SavedFeatureSegmenter.cpp @ 18:8e90a56b4b5f

* merge in segmentation code from soundbite plugin/library repository

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dsp/segmentation/SavedFeatureSegmenter.cpp	Wed Jan 09 10:46:25 2008 +0000
@@ -0,0 +1,97 @@
+/*
+ *  SavedFeatureSegmenter.cpp
+ *  soundbite
+ *
+ *  Created by Mark Levy on 23/03/2006.
+ *  Copyright 2006 Centre for Digital Music, Queen Mary, University of London. All rights reserved.
+ *
+ */
+
+#include <cfloat>
+#include <cmath>
+
+#include "SavedFeatureSegmenter.h"
+#include "cluster_segmenter.h"
+#include "segment.h"
+
+SavedFeatureSegmenter::SavedFeatureSegmenter(SavedFeatureSegmenterParams params) : windowSize(params.windowSize),
+hopSize(params.hopSize),
+nHMMStates(params.nHMMStates),
+nclusters(params.nclusters),
+histogramLength(params.histogramLength),
+neighbourhoodLimit(params.neighbourhoodLimit)
+{
+}
+
+void SavedFeatureSegmenter::initialise(int fs)
+{
+	samplerate = fs;
+}
+
+SavedFeatureSegmenter::~SavedFeatureSegmenter() 
+{
+}
+
+void SavedFeatureSegmenter::segment(int m)
+{
+	nclusters = m;
+	segment();
+}
+
+void SavedFeatureSegmenter::setFeatures(const vector<vector<double> >& f)
+{
+	features = f;
+}
+
+void SavedFeatureSegmenter::segment()
+{
+	// for now copy the features to a native array and use the existing C segmenter...
+	double** arrFeatures = new double*[features.size()];	
+	for (int i = 0; i < features.size(); i++)
+	{
+		arrFeatures[i] = new double[features[0].size()];	// allow space for the normalised envelope
+		for (int j = 0; j < features[0].size(); j++)
+			arrFeatures[i][j] = features[i][j];	
+	}
+	
+	q = new int[features.size()];
+	
+	cluster_segment(q, arrFeatures, features.size(), features[0].size(), nHMMStates, histogramLength, 
+						nclusters, neighbourhoodLimit);
+	// convert the cluster assignment sequence to a segmentation
+	makeSegmentation(q, features.size());		
+	
+	// de-allocate arrays
+	delete [] q;
+	for (int i = 0; i < features.size(); i++)
+		delete [] arrFeatures[i];
+	delete [] arrFeatures;
+	
+	// clear the features
+	clear();
+}
+
+void SavedFeatureSegmenter::makeSegmentation(int* q, int len)
+{
+	segmentation.segments.clear();
+	segmentation.nsegtypes = nclusters;
+	segmentation.samplerate = samplerate;
+	
+	Segment segment;
+	segment.start = 0;
+	segment.type = q[0];
+	
+	for (int i = 1; i < len; i++)
+	{
+		if (q[i] != q[i-1])
+		{
+			segment.end = i * getHopsize();
+			segmentation.segments.push_back(segment);
+			segment.type = q[i];
+			segment.start = segment.end;
+		}
+	}
+	segment.end = len * getHopsize();
+	segmentation.segments.push_back(segment);
+}
+